1- bu-18 pvt sampling operation design2013.11.23

8/12/2019 1- BU-18 PVT Sampling Operation Design2013.11.23

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BU-18 Slickline PVT Sampling

Operation Design

Prepared by:

Reviewed by:

Reviewed by:

Reviewed by:

Approved by:

Well-tech of China Oilfield Services Limited

Nov 232013


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Contents

1 Basic Data ................................................................................................................................ 1

1.1 Basic data of well drilling and completion ........................................................................... 11.2 Perforation data sheet ........................................................................................................... 12 The Purpose and work scope for well test ............................................................................... 13 Construction geological conditions ......................................................................................... 14 Operation program and time limit ........................................................................................... 15 Job preparation ........................................................................................................................ 15.1 Operator and service content ................................................................................................ 15.2 Job preparation ..................................................................................................................... 25.3 Onsite preparation ................................................................................................................ 26 Operation interface .................................................................................................................. 27 Operation steps ........................................................................................................................ 37.1 Fix the wellhead ................................................................................................................... 37.2 Wiper trip .............................................................................................................................. 37.3 RIH the PDS sampler ........................................................................................................... 47.4 Pull the PDS sampler and measure flowing pressure gradient ............................................. 4

7.5 Sample transferring6

8 Notice ...................................................................................................................................... 69 Safety measures ....................................................................................................................... 59.1 Safety requirements of slick line operation .......................................................................... 59.2 Safety measures in exceptional circumstances ..................................................................... 69.3 Emergency measures of hydrocarbon releasing ................................................................... 79.4 Potential risk and methods ................................................................................................... 710 Appendix ............................................................................................................................... 8Appendix1: Device listing .......................................................................................................... 8Appendix2: Wiper trip tool string .............................................................................................. 8Appendix3: PVT sampling tool string ........................................................................................ 9Appendix4: Production pipe schematic .................................................................................... 10Appendix5: BU-18 well test JSA ............................................................................................. 10


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BU-18 Slickline PVT Sampling Operation Design

Page 1 of 17

1 Basic Data

1.1Basic data of well drilling and completion(1) Well No.:BU-18

(2) Well type: natural flow oil well

(3) Test interval: 3830m

(4) Target formation: Mishrif

(5) Current producing horizon: Mishrif reservoir

(6) Completion: case hole perforated completion

(7) Inclination data: the well is vertical well

1.2Perforation data sheetWell No. Perforation depth (m) Unit Reservoir

BU-18 3825-3833 MB21 Mishrif

2 The Purpose and work scope for PVT sampling

1) Run the PDS sampler down into nearly the mid-depth of Mishrif reservoir when the oil wellproduce normally, take two PVT sample of reservoir fluid.

2) Take the flowing pressure gradient.

3 Construction geological conditions

AppendixReservoir Design of Well BU-18

4 Operation program and time limit

NO. working programplan time

h

Time

h

Total time

h

1 Wiper trip 3

2 RIH the PDS sampler 3

3Pull the PDS sampler and measure flowingpressure gradient

3

5 Job preparation

5.1 Operator and service content

1) One job supervisor :control the onsite job

2) Each one person for crane and rigger of Well-tech: provide crane operation service. Four slick line

operators of well-tech, one windlass, and one tool case: provide slick line job service.

3) person of Well-tech slick line department, 1 slick line winch, 1 tool box, 2 Pressure gauge, provide


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slick line service.( Appendix 1Device listing )

5.2 Job preparation

1) Edit, verify and confirm the job design.

2) Job mobilization according the job time demand,Do this operation mobilization.

3) Slick line equipment preparation of well-tech.

Take all the equipments and accessories relate with slick line job for BU-18 well.

Check slick line windlass carefully, and test it, the depth reading of slick line should beaccurate.

4) All the down hole tools and surface equipments should be checked by job supervisor before go tothe onsite, detailing content as follows:

The qualification of equipment.

The certification of proof before job.

All the pressure and functional tests of the equipments should check-out and be recorded.

All the measuring instruments should check-out.

Pressure testing for the lubricator is 3000psi/10min.

Call all related responsible official together to introduce the detailing of the job design.

5.3 Onsite preparation

1) Check the situation and number of all tools and equipments reached the well-site.

2) Hold a meeting to study the safety regulation and operation procedure and let all the people knowthe procedure, emergency program and escape line.

3) Make sure the responsible of every position when there is emergency situation.

4) The job responsible official need communicate with the chief of well-site for the fixing and layingof equipment.

6 Operation interface

1) The supervisor is responsible for the coordination and management during the job, make sure theworking go smoothly.

2) The slick line team of well-tech is responsible for the pressure test, combine and optimize toolstring to satisfy meet the job goal.


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7 Operation steps

7.1 Fix the wellhead

1) Company man gives the order to all the contractors and organizes the conducting.

2) After the approval of the onsite director, under the guiding of the oilfield production supervisor orattendant, Make sure the swab valve of X-tree is closing, Keep the main valve and production wingvalve opening, then hang the sign of slick line.

3) Close pressure gauges needle valve to take off the pressure gauge,and then leak off the pressurebetween swab valve and x-tree head.

4) Position the slick line equipments; Make up BOP and lubricator, and do the functional testing of

BOP at 3000psi, keeping it stable for 10 minutes. The length of lubricator should long enough tomeet the job situation.

7.2Wiper trip

1) Inform job supervisor all the slick line things have prepared, it needs the surface safe valve positionat open situation, the main valve position kept at open situation, production wing valve position

kept at open situation, the well reach at working situation.

2) Connect suitable size(58 mm)of gauge cutter, check zero of depth at surface ground.

3) Open the swab valve 1 to 2 circles slowly, the down hole pressure go into lubricator grandly andobserve it for 10 minutes, and check if there is leaking from wellhead and lubricator. If the leakingis happen, close swab valve immediately, blow down the pressure and processing it; otherwise

continue open it totally, record the turn number, observing it for 10 minutes.

4) Slick line tools should down hole slowly and smoothly, after wiper trip to about 3850m, take outslick tools, wiper hole job needs:

Assemble tool string simulate well test. (Appendix 2Wiper trip tool string)

Up and down tool string test every 500 meters.

Notice the down speed and record it.

The maximum up and speed shall not faster than 80 m/min. if pull weight is abnormal, stopwinch immediately and analyze the reason.

5) Take out wiper tools to lubricator and confirm it, then close swab valve, leak the pressure in thelubricator, take off lubricator, disconnect wiper tool string.

6) If we select normal sequence from big to small gauge cutter(70 mm , 65 mm ) to wiper trip,operating procedures as the same; if successful, report to the supervisor, continue the next step work,if fail, communicate with supervisor and talk about resolve method.


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7.3 RIH the PDS sampler

1) Change the oil choke to 24/64 24hours before the job start, and keep the fluid production stableuntil the job finish.

2) Prepare two PDS sampler;

3) Assemble PDS sampling tools string (Appendix 3: RIH the PDS sampling tool string);

4) Open the swab valve 1 to 2 circles slowly, the down hole pressure go into lubricator grandly andobserve it for 10 minutes, and check if there is leaking from wellhead and lubricator. If the leakingis happen, close swab valve immediately, blow down the pressure and processing it; otherwise

continue open it totally, record the turn number, observing it for 10 minutes.

5) Slick line tools should down hole slowly and smoothly, the maximum up and speed shall not fasterthan 60 m/min;

6) Up and down tool string test every 500 meters, record the weight detailed;

7) When tool strings reach to 3830m, move up and down PDS sampling tool strings for three times,then wait to the PDS sampler to take sample. Leave it inside the well for at least one hour after theset clock time is over;

7.4 Pull the PDS sampler and measure flowing pressure gradient

1) Pull the tool strings up and stop at 3830m, 3780m, 3730m, 3500m, 3000m, 2500m, 2000m,2000m, 1500m, 1000m, 500m for 5 minutes to measure flowing pressure ;

NO. Stop depth Stop time Point interval

1 3830m 5min 10s

2 3780m 5min 10s

3 3730m 5min 10s4 3500m 5min 10s5 3000m 5min 10s

6 2500m 5min 10s

7 2000m 5min 10s

8 1500m 5min 10s

9 1000m 5min 10s10 500m 5min 10s

11 0m 5min 10s

2) Pull the strings out of hole;

8 Notice

1) It needs to check if the pipe string depth has something wrong to make sure the operation successratio.

2) In case the leaking of main valve and surface safety valve to avoid the failing of lubricator systempressure testing, operator should check carefully, maintenance and make necessary exchangingfor sealing before fixing lubricator system.


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3) It should know clearly blow down procedure before blow down every time.

4) Someone should on duty on well-site to check the wellhead all day during slick line job.

5) It should have warning belt around slick line equipments.

6) Forbidden hoisting goods above slick line area during working period.

9 Safety measures

9.1 Safety requirements of slick line operation

1) The linking of the above tools and operation must under the present direction of team header.

2) Slick line winch and other devices should be holding well, layout reasonably, and operate easily andsafety.

3) The lubricator must have pressure gauge and relief valve, the length of lubricator should be greaterthan the length of tool string.

4) Strictly control the slick line actual tension is not exceeding the limitation range.

5) After X-tree operation, open swab valve and master valve, it should be list slick line operationand other words.

6) When connecting slick line tools and pulling out or exchanging device every time, before running

in, the place of threaded connection should be fastened again.

7) During operation processing, if blocking is happen, it should up and down tools slowly, dontrunning in being forced.

8) If doing many times slick line job continuously, cutting off a short part of slick line and makingrope socket again to keep the device in a good working condition.

9) If do slick line fishing job, the running tools should be considerate it can be released.

10) All the running tools must be measured length, outside diameter, internal diameter before runningin.

11) When cutting off slick line on the ground, it should hold slick line with two hands to prevent slickline head from jumping up to hurt yourself and others.

12) The end portion of slick line unit must be firmly fixed.

13) During slick line job, irrelevant personnel should stay away wellhead, operator also pay attention tothe wellhead safety. If found abnormal circumstances, operator should immediately stop slick line

job and deal with it.

14) The lubricator and winch should fixing reliable, binding tightly and holding well by iron link orslick line; if blocking is happen, after the approval of supervisor and the direction of first party,

processing it by taking short distance moving, and taking relevant measurements to avoid hurting

incident because of slick line snapping.


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15) If there is overlapping job, safety measures and techniques must be in place. It should takefeasibility analysis at first to confirm the scientific and feasible before carry out.

16) We must know enough about the condition of well. it should know the pipe string, well deviation, minimum inside diameter and so on.

17) Set the implementation procedures according to first partys construction requirements. Beforeoperation, holding safety meeting to make operator know the risk in every operations.

18) Make full analysis for potential problems of operation equipment, tools, material. It should knowservice condition of semi-fragile component and the number of accessory.

9.2 Safety measures in exceptional circumstances

1) When there is slick line tools down hole emergency, it should report to field supervisor, oilfielddirector, branch office, Well-tech department at first.

2) Stop operation firstly, analyzing and finding reason right away and determine the type of accident.

3) Making relevant dealing measures according to accident type.

4) If tools couldnt be pulled out, tools could move down but not go up, we should try to change theplace of tools or the condition of stuck point to find opportunities in the process of trying. Dont

pull out by force to avoid entire tool string being stuck.

5) If tools get stuck in down hole, dont go up and down, it should make sure jar if in normal condition.If jar work well, it should consider which is the major way between upward jarring and downward

jarring. In general, upward jarring is the major way, but downward jarring is also important,Velocity is the key.

6) If tools get stuck in down hole, dont go up and down, and the jar cant work. It is very probablytool string get stuck with tubing wall. The reason is tha t the tubing is in the shape of S. The basicapproach is to open or close the well to change the temperature in down hole. Temperaturechanging will cause the changing of tubing shape of tube, which is in favor of unfreezing.

7) If all three or more ways have failed to resolve, it should consider cut off slick line in down hole (atbullhead) purposely for recovering whole slick line. Then run in suitable tools and tool string to

deal with the problem.

8) Operation method: close slick line BOP on ground, release the pressure of lubricator above the BOP,pull up lubricator, assemble cut rod onto the slick line. Connect lubricator well, open BOP, let cutrod sliding down to the top position of bullhead and cut off slick line suddenly.

9) Shear method: After open BOP, slotted bar slide down along slick line, make use of the impactforce to cut off the slick line from rope cap by inclined force which produced from slotted bar and

bullhead. After slick line being cut off, it can recover entire slick line to ground. Reassemble toolstring to do next work.

10) To avoid cutting tool not being in place or not cutting off at the right position, it should have donethe following works well in advance.

Think over all the preparatory work. For example, what about the ability of BOP? Theperformance of BV and related tool, hand pump, pipelines and so on.


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Tools selection: There are several kinds of cutting tools, such as impact bar that play asupporting role. In order to prevent cutting tool get stuck in the middle road, it can use1-1/2cut rod or increase the numbers of impact bar to strengthen the down force. Even use

1-1/2 ,x 3or 5impact bar.

Tighten the slick line when cutting bar slide down, pull to 800 LBS.

In normal circumstances, the slick line will loosing after 20 minutes, which indicate the slickline have been cut off. Otherwise it means the slick line hasnt been cut off. Put into anotherimpact bar to impact cut rod down or increase shear force to cut off slick line from the position

of rope socket.

If specific implementation measures crash with processing method, please shutdown operation,waiting for the order from leaders. Same problem have different phenomena in different well,

solving measures and parameters are not the same too. The above measures and parameters are

reference only, dont apply mechanically, or get the differently results.

9.3 Emergency measures of hydrocarbon releasing

1) The slick line operator should find out the point of hydrocarbon releasingat first time.

2) If processing measures failure, on site supervisor and slick line captain have right to close all thevalves of x-tree.

3) If there is hydrocarbon releasing occur during normal operation processing, all the people inwell-site should stop hot working at once.

4) When there is hydrocarbon release occur during normal operation processing, notice slick linecaptain and site supervisor ; If hydrocarbon release is out of control, it should notice all the workers

to keep in emergency situation on well site by broadcast at once.

5) In operation processing, slick line operator must equip work interphone.

9.4 Potential risk and methods

1) Wellhead X-tree cannot be removed or some accessories damaged and so on. Equipped allremoving tools and special tools, when the accessories damaged or cannot be used, it should

communicate with onsite supervisor to provide appropriate accessories by first party

2) The X-tree flange or valve have leakage, it should communicate with jobsite supervisor to repair itbefore working

3) If wiper trip working cannot go smoothly during operation, slick line operator should make sure thesituation of tubing, there are several methods:

Exchanging smaller gauge ring to wiper trip, exchanged the size by followed, every time 4mmsmaller than last one to confirm, and it cannot exceed than 3 times to watch which time will be

ok. If go through, then go to the goal depth, and go through many times at the last blocking

position, until it can running tool string smoothly, then exchange gauge ring from smaller tobigger to wiper hole, till the designing gauge ring can wiper hole smoothly.

If wiper trip cannot go smoothly, selecting suitable font to confirm the blocking situation towatch if there are tubing distorted, hard objects, sand and so on. If it still cannot be confirmed


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by font, first party should provide coiled tubing or pump car to flush the tubing, and then wiper

hole again to confirm.

4) It is possible there is no marking on the font in mark font job, so that the down hole situation will benot clearly. Method: first party provides coiled tubing to flush the wellbore, and then do impression

tool job. If the font marking is clearly, then do the next job, otherwise communicate with first partysupervisor again or do long time flushing job or fish the down hole crud.

5) During operation processing, in order to avoid possible fire hazard, it should take appropriatemeasures: ensure the performance of the riot, the personnel onsite safety education, not allow to use

non- explosion-proof equipment in safe area, not permitted with a fire source, having appropriate

fire fighting equipments, there are portable fire extinguisher near the X-tree and the equipments.

10 Appendix

Appendix1: Device listing

Appendix2: Wiper trip tool string

Name length in.) OD in. )Rope socket 6.1 1.875

Swivel joint 11.0 1.875

Weight bar 59.8 1.875

Knuckle joint 9.8 1.875

Quick release joint 13.8 1.875

Weight bar 35.8 1.875

Quick release joint 13.8 1.875

Mechanical jar 81.151.2 1.875

Crossover 3.9 1.875

Gauge cutter 8.7 2.28

total 162.7


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Appendix3: PVT sampling tool string

Namelengthin.)

ODin. )

Weightlbs)

Rope socket 6.0 1.875 3.08

Swivel joint 7.0 1.875 6.6

Weight bar 24 1.875 29

Quick release joint 13.8 1.875 8.58

Crossover 3.9 1.875 2.42

PVT 137.8 1.7 25

Crossover 1.9 1.7 0.5

Crossover 3.9 1.875 2.42

Knuckle joint 9.8 1.875 5.5

Quick release joint 13.8 1.875 8.58

Crossover 3.9 1.875 2.42

PVT 137.8 1.7 25


Shock absorber 21.0 1.875 13.2


Pressure gauge 9.5 1.25 2

Total 399.9 136.3


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Appendix4: Production pipe schematic

Appendix6: BU-18 well test JSA

BU-18 slick line well test JSA

BU-18 JSA Table Complete date

Fauqioil field

The member of JSA team


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Step Job ProcedurePotential

HazardsRisk Control Measures

Resp

onsibl

e

official

Remark

1

Work

environment

and geography

factor

person hurt

and equipment

losing

1. Before working,know nearby society and

culture situation;

2. Be careful the sunny

and high temperature;

3. Prepare first aid box

in case of emergency

accidents;

4. Prepare some

medicine to resist

mosquito and snake ants

etc;5. Know the roads,

6. Equipped with

security protection

equipment and personnel

security.

7.According to thenumber of vehicles with

homework on duty on duty

and prevent of emergency

2

Equipments

hanging on

base

Personnel Hurt

and equipment

damage

1. Check the equipments

carefully according to the

driving requirements;

2. Make sure the cranein the hanging situation;

3.Tell the true weight of

equipment to crane driver;

4.It needs professional

person direct the crane and

forbidden unrelated

persons

Equipment

transporting

Equipment

damage

1.Ready-made the

position and fixing of

equipments with driver;

2. If it is possible, let the

engineer take part in the

transporting to monitor thewhole processing.

Equipment

position onsite

Personnel Hurt

and equipment

damage

1.Related person take

enough protective

inventory;

2. Position the

equipments after them

arrived at the onsite as

soon as possible;

3. Pay attention to the

stability and safety during

hanging;

4. Check the equipment

in time, discover theproblem and deal


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3 Handover well

Handover not

clearly;

operationwrong; person

and well

accidents

1. Confirm the working

status of each valve and

make sure the situation of

the well;2. When transfer wells,

unrelated personnel do not

operate valves without

permission.

4

take off

wellhead

devices

Environment

pollution at

the wellhead;

wellhead

pressure gauge

damage;

Personnel

hurt(Falling,

bruising,

crushing,

pummeling,high

pressure) ;

blowout; sling

breaking

1. Blowout according to

nation or customers

requirements, otherwise

obey rule of operator ;

2. Stop all the hot work,

oil spill should use the

hosepipe to designate

emission;

3. In case of presence ofH2S the release will be

made according to the

procedures given by the

Company and issued on

the operating program.

4. For H2S Wells aInjection Nipple shall be

installed between the

Stuffing Box and the

Lubricator and shall have a

pipe, cock valve and a

flexible to flush the

lubricator with water afterbleeding off the lubricator

pressure. The

hydrocarbons liquid and

water shall be recovered in

the Flow Line and Sump

Tank.

5. In the presence

of H2S, always carry

escape masque during

the job.

A self-breathingapparatus must be used by

the operator for bleeding

off lubricator.

5

surfacepreparation

before BOP

system fixing

person hurt;

packing partsand packing

position of

BOP system

damage

1. Take on enough

protective inventories;2. Checking carefully;

3. Be ready related

packing parts.

fixing BOP

system

Blowout;

device

damage;

person hurt;danger during

tools hanging

1. Forbidden random

operation of wellhead

valve during operation;

hang forbidden label,operate the valves by

slickline operator;


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and wrong

direction; slick

line damage;

deviceaccident

because of

corrosion.

2. It needs professional

person direct the crane, the

crane driver should work

with certification, and thecrane should work v

6Power on the

equipment

Personnel

Hurt; devices

damage

1. Operators should

wear necessary inventory,

including protective glass

and so on;

2.Stay in the safety field

to avoid personnel hurt

because of the elasticity of

the slick line;

3. Before power on the

equipments, check allkinds of fluid level and

pipe

7pressure test

of BOP

system

Personnel hurt

( line break,

crushed by

shaking

booboo,

bruise )

1. Personnel must wear

the qualified protection

supplies, including

protective glasses;

2. Through radio,warning tape for isolation;

3. Special person check

it in a safe location,

prohibit irrelevant

personnel enters a high

pressure area.

BOP

installation

failed

1. Check the ring and

the ring groove;

2. Ensure locate the

BOP correct, on the

balance of the diagonal.

Equipment

damage

( pressure

build)

1.Check the diesel oil,

cooling water before

starting the diesel engine;2. Check the safety

valve set pressure is up to

the standard before starting

the mud pump;

3. Operating the pumpshould be smoothly and

slowing.

8 check slick

line situationperson hurting

1. Take necessary

protective inventories in

case of accidents in

checking processing;

2. Pay attention the

standing position prevent

the damage from elastic

slick line;

3. Drag slick line stable

out of roller when the

windlass in neutralposition.


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make slickline cap

1.The major operator

need pay attention safety

during making slick line

knot;2.Unrelated person not

allow to stay near in case

of damaging;

3. The operator pay

attention to protect the

wellhead.

9

confirm and

prepare for

running down

hole

person

hurting; slick

line and knot

cap damaging;

wellbore junk

1. Operator pay

attention safety;

2. Check the quality of

screw thread, connection

order; make sure the tool

string meet the

requirement.

design tool

string

Mismatch job

design, cannot

finish the job;

do not know

the well

situation andcannot reach

job goal, even

have accident

happen.

1. Understanding the job

requirements which is

based on the design;

2. Know whole working

situation and well history;

3.The final and best

design should beenapproved by onsite

supervisor;

4. All the tools must H2S

resisting in case of

accidence.

10

preparation

and check

person hurting

and tools

damage

1. take on enough andsuitable protective

inventory;

2. Preparation and

checking according to the

slick line wellhead

preparation procedure and

requirement.

wellhead

fixing

person

hurting; slick

line and downhole tools,

BOP system

damaging;

wellbore junk

1. Take on enough andsuitable protective

inventory;

2. Fix wellhead system

according to the slick line

wellhead preparationprocedure and

requirement;

3.Related persons need

pay attention the

coordinate between each

other during fixing, to

avoid the drama

11open x-tree

valves

high pressure,

oil and gas

leakage,

danger caused

by poison gas;

the dangercaused by the

1. Open the valves

according to slick line

processing procedure,

oilfield and related

technique requirements, it

needs two personscooperate each other to


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up rush of

slick line; the

danger caused

by semi-openvalves

operate, and take on

breather if it is necessary;

2. Wellhead valves

operator ensure if thevalves is

close x-tree

valves

valves uptight;accidents

caused by

slick line and

tool string

broken

1. Inform valve operator

after the major slick lineoperator ensures slick line

and tool string inside the

BOP system totally;

2. Wellhead valves

operator ensure if the

valves is opening totally.

12

combine tool

string and

select thegauge ring

cannot finish

job; tools drop

out and lost

down hole;person

hurting

1. Select suitable the

size of tools according to

schematic, check fishingtools carefully, select

suitable gauge ring;

2. When exchange thetool string, tight threading

for tools in case of losing;

3. Worker should take

on quantified protective

inventory

wiper trip

processing

tool string

blocking orsticking,

cannot finish

the job; slickline snap

because of

oversized

pulling power;

person

hurting; close

valve wrong to

cause slickline cut off;

depth wrong,

tools losing;

saver leakage

1. Before working,

know the well situation, becare for wrong depths

interval, sometime it is

necessary to get approve of

supervisor to start the job;

2. Forbidden mark font

two times;

3. When pulling power

greater than normal, reportit to supervisor, co

13Well test

process

Due to thepressure gauge

fault, cause thetest failed; The

necessary data

forget to

record, cause

test results

cannot be

calculated;

Personal

injury;

Shut off

wrong valve,Cut wire;

1.Make carefulexamination to pressure

gauge and relatedequipment before test,

make careful records;

2. Pressure gauge

Engineer check on the data

carefully;

3.Personnel must wear

an approved protective

equipment, enhance

self-protect consciousness;

4.Irrelevant personnel

should be away from thework area; Winding


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Pressure gauge

damage;

operation area with yellow

caution tape in, lock valve,

and hanging operation is

prohibited sign;5.When replace pressure

gauge, be circumspect,

RIH AND POOH speed

should not exceed the rated

speed;

14

rig out

wellhead BOP

system

Blowout;

device

damage;

person hurt;

danger duringtools hanging

and wrong

direction; slickline damage;

device

accident

because of

corrosion.

1. Forbidden random

operation of wellhead

valve during operation;

hang forbidden label,operate the valves by slick

line operator;

2. It needs professionalperson direct the crane, the

crane driver should work

with certification, and the

crane should work

15

recover

wellhead

devices

Environment

pollution at

the wellhead;

Personnel

hurt(Falling,

bruising,

crushing,pummeling,

highpressure) ;

blowout

1. Worker should take

on qualified protective

inventory, operator should

equip with safe-belt whenthe x-tree is high,

forbidden operating with

pressure;

2. The threading shouldin position well by

operator, and smearcompound and twist crude

material

The member of JSA team signature

1- bu-18 pvt sampling operation design2013.11.23

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