L-type casing fractured horizontal wells have great technical advantages in the development of low-permeability or deep coalbed methane fields.As one of the important methods for horizontal well drainage and production,the electric submersible screw pump lifting process has technological advantages such as large displacement,small equipment footprint,convenient parameter adjustment,and a high de-gree of automation.Based on drainage and production practice from over 270 wells on site,it is identified that this type of pump has 5 types of faults such as pump jamming and pump burning.The production characteristics and causes before and after each type of fault are analyzed and summarized,and 4 targeted prevention and later treatment measures are proposed.The research results lay the foundation for stable drainage and production of electric submersible screw pumps in the Qinshui coalbed methane field,and also provide a reference for the development of other coalbed methane blocks.
Coalbed methane wellelectric submersible screw pumpsfault identification and diagnos-tictreatment strategies
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