As the the proportion of L-shaped horizontal wells in coalbed methane fields increases,the rodless lifting technology has been paid more attention to.With good adaptability to liquid-solid phases and excellent underground passability,the submersible diaphragm pump shows potential for widespread application in L-shaped horizontal wells.After being introduced in a certain gas field in Southern Qinshui Basin in 2019,issues such as the airlock faults were found in the process of testing,a multi-sand control and degassing technology were developed,incorporating a three-phase gas-liquid separation unit,a gas release lock joint and a sand settling unit,matching the supporting technology,such as self-circulating water re-injection.The field test successfully resolves the issue of the airlock,leading to the initial estab-lishment of a drainage and gas recovery system using a submersible diaphragm pump.This system is suit-able for the promotion and application of L-type horizontal wells with medium and low water production.
Coalbed methanesubmersible diaphragm pumphorizontal wellsand control and degassing
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