workover safety
TRANSCRIPT
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Workover Safety
David Calvert, True Oil Enterprises Inc
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December 4 -5, 2012
SAFETY..Safe operating practices and procedures are vitalin the drilling business because the work is hazardous,
involving massive machinery, heavy tools and great physical
strength.
Yesterday Today
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Squeezing Cement
Acidizing
Wireline
Casing Running or Pulling
Snubbing Operations
Workover Operations Safety
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Squeezing Cement
A remedial cementing operation
designed to force cement into leak pathsin wellbore tubular. The required
squeeze pressure is achieved by
carefully controlling pump pressure.
Squeezing is performed to:
1. repair poor primary cement jobs
2. isolate perforations
3. repair damaged casing or liner
Formation
Casing
Mud Slurry
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Pressure is the main concern. Squeezing cement can require
pressures that may supersede equipment used from the well
service company.
Care needs to be given to ensure all connections and equipment
ratings are known and tested.
Cement dust from the mixing process is an irritant. Proper PPE
should be considered.
Wet cement should be washed off of oneself ASAP.
Wet cement in the eyes will cause serious if not permanent
damage.
Squeezing Cement Safety Concerns
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Acidizing
The pumping of acid into the wellbore to remove near-well formationdamage and other damaging substances.
This procedure commonly enhances production by increasing theeffective well radius.
When performed at pressures above the pressure required tofracture the formation, the procedure is often referred to as acidfracturing.
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Same as Cementing J ob.
Can be spotted in the well bore with no additional pressure required.
Squeezing acids adds a whole new level of danger due to the risk fromfailure of equipment due to increased pressure.
Also types of acid used can be very corrosive to the human body ifcontacted.
Great degree of attention needs to be used in PPE selection
Acidizing Safety Concerns
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Wireline
Wireline - a cable conveyancetechnology where a current issent to downhole tools in oilwell exploration andcompletions.
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Many incidents were related to dropped tool strings resulting from pullingthe tool string into the top sheave or stuffing box causing the wire to part
and while laying tools down.
When the dropped tool string is contained within the well bore/lubricator,there is little risk to personnel.
However, when it is dropped prior to being inserted into the lubricator orwell bore, there is the potential for serious or fatal injury to personnel.
Significant underlying causes of the incidents were failures orinadequacies in:
Risk Assessment Training and Competence Supervision Communication
Wireline
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Perforating is the most dangerous wireline operation because of
the use of explosives.
Guns have gone off prematurely killing workers.
High risk tool entrapment causing wireline parting.
Well blow out after perforating due to inadequate/improper testing
of or not using a lubricator
Wireline operator dropping tool strings on floor when laying
down or picking up
Wireline Safety Concerns
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Steel pipe cemented in place during
the construction process to stabilizethe wellbore to:
prevent the formation wall fromcaving into the wellbore
isolate the different formations toprevent the flow or cross flow offormation fluid
provide a means of maintainingcontrol of formation fluids and pressureas the well is drilled.
Casing Running or Pulling
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Odd pipe sizes make it an unusual operation on a workover rig.
Cutting and pulling casing can subject the rig structure to high hookloads.
Special care needs to taken to ensure weight indicators are properlycalibrated
Workers should not be on the floor during excessive pulling operations.
Casing Running or Pulling Safety Concerns
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The act ofpushing drill pipe into the wellbore when theblowout preventers (BOPs) are closed and pressure iscontained in the well.
In ordinary operations, the pipe falls into the wellboreunder its own weight, and no additional downward force
or pushing is required.
In snubbing operations, the pressure in the wellboreacting on the cross-sectional area of the tubular canexert sufficient force to overcome the weight of the drill
string, so the string must be pushed (or "snubbed") backinto the wellbore.
Snubbing
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Snubbing Unit can be tall so
the potential for falling parts orworkers are possible issues.
Operations are done with thewell under pressure.
Always need good supervision.
Snubbing Safety Concerns
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We have come a long way from Yesterday
Torpedoes of dynamite used to extinguish a well
http://www.sjvgeology.org/history/lakeview/torpedos_tn.jpghttp://www.sjvgeology.org/history/lakeview/torpedos_tn.jpghttp://www.sjvgeology.org/history/lakeview/torpedos_tn.jpg -
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REMEMBER..
No job is so important
No service is so urgent
that we cannot take time to perform our work safely.
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Im ready to worksafe.
Hello..Is anyone there?
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Questions?