Dedicated Services related to Workover and Fishing

 2017-01-12 16:36:29 click

We completed high-difficulty fishing operation for a well of Southern Sichuan Gas Division. 
Challenges: deep wells, slim hole wells; treatment of four permanent packers (rare in the world); casing breakage; wrong data on pipe string fish; multi-stage bridge plug treatment
Achievements: the whole pipe string was cut into four parts using the magnesium powder cutting technology and then they were milled or fished separately.
We completed nitrogen foam sand washing and plugging removal with coiled tubing for a well in the Tarim Oilfield in Feb. 2013, and the largest operation depth was nearly 7400m, thus solving the sand plugging problem with low pressure deep horizontal wells containing carbonate rocks.
We successfully solved a complex downhole problem using the coiled tubing unconventional workover technology in the risk turnkey mode in the Tarim Oilfield in Jun. 2013. It was the first time that the coiled tubing unconventional workover technology had been used to drill and mill a subsurface safety valve and eliminate coating blockage in tubing in an ultra-high sour well (120000PPM) with the shut-in pressure of 45MPA in an onshore oil and gas field.
We successfully completed the treatment of the first mixed intermediate casing deformation, unfreezing and fishing accident in the Tarim Oilfield in Oct. 2014.
Challenge: serious involution deformation of the 9 5/8 " casing and complete sticking of the test string during leakage check of the 7" liner bell mouth due to too large test differential pressure.
Main measures: forcible milling of the 9 5/8 " deformed casing and then unfreezing and fishing.



 
We successfully solved a complex downhole problem in a well in the southwest region using the coiled tubing unconventional operation technology in the risk turnkey mode in Oct. 2014. The largest operation depth reached 6876m, creating the record of the largest fishing operation depth with coiled tubing in China at present.
Operation contents: liquid nitrogen induced flow, steel ball fishing, milling and diameter enlargement, ball seat fishing, negative pressure bailing, through tubing perforation, acidizing, fracturing and production restoration, etc.
We completed the workover operation for the four-stage packer string in 5 1/2" casing of a well in the risk turnkey mode in Inner Mongolia at the end of 2014.

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