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Thursday, November 28, 2013

Causes of Kick (Wellbore Influx)

A “Kick” or “Wellbore Influx” is undesirable flow of formation fluid into the wellbore and it happens when formation pressure is more than hydrostatic pressure in wellbore.
Deepwater Horizon offshore drilling unit on fire 2010 (Wiki)

Several causes of Kick (Wellbore Influx) are listed below:
1. Lack of knowledge and experience of personnel (Human error)– Lacking of well-trained personnel can cause well control incident because they don’t have any ideas what can cause well control problem. For example, personnel may accidentally pump lighter fluid into wellbore and if the fluid is light enough, reservoir pressure can overcome hydrostatic pressure.

2. Light density fluid in wellbore - It results in decreasing hydrostatic pressure. There are several reasons that can cause this issue such as

• Light pills, sweep, spacer in hole

• Accidental dilution of drilling fluid

• Gas cut mud

3. Abnormal pressure – If abnormally high pressure zones are over current mud weight in the well, eventually kick will occur.

4. Unable to keep the hole full all the time while drilling and tripping. If hole is not full with drilling fluid, overall hydrostatic pressure will decrease.

5. Severe lost circulation – Due to lost circulation in formation, if the well could not be kept fully filled all the time, hydrostatic pressure will be decreased.

Lost circulation usually caused when the hydrostatic pressure of drilling fluid exceeds formation pressure. There are several factors that can cause lost circulation such as

• Mud properties – mud weight is too heavy and too viscous.

• High Equivalent Circulating Density

• High surge pressure due to tripping in hole so fast

• Drilling into weak formation strength zone

6. Swabbing causes reducing wellbore hydrostatic pressure.
Swabbing is the condition that happens when anything in a hole such as drill string, logging tool, completion sting, etc is pulled and it brings out decreasing hydrostatic pressure. Anyway, swabbing can be recognized while pulling out of hole by closely monitoring hole fill in trip sheet.
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Tuesday, November 26, 2013

Schlumberger Open Recruitment 2014 : 2 positions

85 SCHLUMBERGER RECRUITING SESSIONPosition available:
FIELD SPECIALIST for Fresh Graduates
FIELD SPECIALIST for Mid Career


Requirements for Fresh Graduate Candidates:
• D3 and D-4 Polytechnic from all ENGINEERING Degree
• Dynamic men with maximum age of 26 years old
• Very good academic result, with minimum GPA 2.70
• Excellent command of English


Requirements for Mid Career Candidates:
• Dynamic men with max 3 year working experience in Oil & Gas Services
• D3 and D-4 Polytechnic from all ENGINEERING Degree
• Excellent command of English


Application Procedure:
• Interested candidates should send CVs to INGRecruiting@slb.com with email title format:
“Degree (D3/D4)_Years of Experience (0/1/2/3 years)_FS Application”
• Maximum CV size is 5 Mb.
• Registration will be closed on 04-Dec-2013


Chosen candidates will be invited to selection test by email therefore candidates need to check their emails regularly after applying.

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Saturday, November 16, 2013

Texas-Drilling Rig Hits Gas Pipeline Then Explodes

November 14th, 2013 MILFORD, Texas -Hundreds of people in Ellis County were evacuated and others were asked to stay away from the area where a gas pipeline caught fire Thursday morning.
It happened at about 9:30 a.m. November 14th, 2013 near the intersection of Highway 77 and FM 308 in Milford.
Ellis County spokesman James Saulter said a Chevron crew had been conducting a type of drilling when the explosion happened.
Video from SKY4 showed heavy flames rising from what appeared to a rig in a rural field. It was surrounded by several charred work trucks. The large plum of black smoke was visible from Interstate 35E.
No one was hurt and there were no reports of damage to any nearby homes or businesses, Saulter said.
However, officials are still concerned about the fire spreading to other pipelines in the area.
The whole city of Milford, which has a population of about 800, was evacuated. Students were moved to schools in the nearby town of Italy.
Traffic on FM 308 was rerouted between Highways 22 and 77. Motorists in the area were asked to use I-35E as an alternative to Hwy. 77.
Chevron will let the pipeline burn itself out, which is expect to take about 24 hours, Saulter said.
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