CAJ | 학술논문

水平井是高尚堡浅层断块油藏的主要开采方式,在水平井开发过程中易形成边底水突进、水窜、水淹,油井含水上升速度快,导致油井产能下降,严重影响油田的开发效果。针对水平井开发后期产能下降的问题,采用了CO2吞吐增油技术。其主要技术原理为：在地层温度条件下CO2能快速溶于原油中,使原油膨胀,改变原油的物性,大幅度降低原油黏度,降低油水界面张力,增加溶解气驱的能量,进而达到油井增产的目的。34井次的现场应用结果证实,水平井单井日产油量由1.72 t增加到4.88 t,含水率由95.00%下降到51.45%,控水增油效果显著。
수평정시고상보천층단괴유장적주요개채방식,재수평정개발과정중역형성변저수돌진、수찬、수엄,유정함수상승속도쾌,도치유정산능하강,엄중영향유전적개발효과。침대수평정개발후기산능하강적문제,채용료CO2탄토증유기술。기주요기술원리위：재지층온도조건하CO2능쾌속용우원유중,사원유팽창,개변원유적물성,대폭도강저원유점도,강저유수계면장력,증가용해기구적능량,진이체도유정증산적목적。34정차적현장응용결과증실,수평정단정일산유량유1.72 t증가도4.88 t,함수솔유95.00%하강도51.45%,공수증유효과현저。
Horizontal well is the main development way of Gaoshangpu shallow fault-block reservoir.During the process of horizontal well development edge water and bottom water usually channel,finger,flood so that the water cut goes up quickly. After water cut is high,it caused well productivity decreasing,seriously affects the development effects of oil field.To solve this problem,the CO2 huff and puff technology was chose.The main principle was as follows.Under the condition of temperature and pressure,oil can dissolve CO2 quickly.CO2 can expand oil,change the physical property,decrease oil viscosity and interfacial tension between water and oil,increase dissolved gas drive energy then improve oil/gas recovery factor.Field application of 34 wells show that daily oil production increases from 1.72 t to 4.88 t and water cut decreases from 97.5% to 51.45%.The technology has obvious stimulation effect.