Small-displacement oil recovery electric submersible pumups with integrated sand-control and leak-prevention tools
In the K Oilfield,due to reasons such as pump stuck because of frequent sand production and fluid loss during well flushing,the efficiency of small-displacement electric submersible pumps(ESPs)was compromised,resulting in a shortened pump inspection cycles of only 60–280 d,well below the field average of 608 d.The supporting sand-control components were improved,and two sections of sand control pipes with different gaps were connected in series to control sand production in oil wells.A sealing assembly was installed to create two relatively isolated spaces within the tubing and casing through rubber sealing rings.During well flushing,the packer piston,driven radially outward by the high-pressure flushing fluid,anchors the ESP unit within the well,preventing it from falling.Additionally,leak-prevention measures were enhanced:after injecting high-pressure flushing fluid into the annulus,a ball valve within the leak-prevention assembly moves downward,engaging with the valve seat to establish an internal circulation channel and seal off downward fluid leakage.Since 2022,seven wells were implemented these ESPs with integrated sand-control and leak-prevention tools.These units were set at depths of approximately 2,400 m with dynamic fluid levels reaching 1,800 m.The pump inspection cycle for some ESPs with these tools was extended from 390 to 600 d.During 2022–2023,repeated well interventions were reduced by up to 30 instances,with the frequency of interventions in individual wells dropping from five times per well to once per well.The ESP wells show stable production,effectively achieving the goals of extending inspection cycles,reducing intervention frequency,and improving the oil recovery efficiency of small-displacement ESPs.
Electric submersible pump(ESP)Sand productionFluid lossSand controlLeak preventionPump inspection cycleDownhole tool
万方数据
维普
