CAJ | 학술논문

国内西部油田碳酸盐岩地层埋藏深、温度高、缝洞系统发育,生产过程中井区裸眼完井地层出现垮塌现象,堵塞、埋卡管柱.通过研究现场资料对井壁垮塌的原因进行了分析,同时,由于地层温度高、压力大,建立了考虑温度场、渗流场、裂缝产状、水化作用等因素影响的井壁垮塌预测模型,对碳酸盐岩深井高温水化地层裸眼完井垮塌机理进行了研究.研究表明,模型对维持井壁稳定的最小井底压力的预测比常规模型高2~3 MPa,提升了预测精度;随着岩石裂缝倾角的增加,其强度先减小后增加;井壁最为安全的地层是裂缝倾角为0~20°,倾向近水平最小地应力方位,其次是倾角60~90°,倾向近水平最大地应力方位;维持井壁稳定的最小井底压力随着水化后弱面内摩擦因数及弱面黏聚力的降低而增加,随着应力差的增加而增加.
국내서부유전탄산염암지층매장심、온도고、봉동계통발육,생산과정중정구라안완정지층출현과탑현상,도새、매잡관주.통과연구현장자료대정벽과탑적원인진행료분석,동시,유우지층온도고、압력대,건립료고필온도장、삼류장、렬봉산상、수화작용등인소영향적정벽과탑예측모형,대탄산염암심정고온수화지층라안완정과탑궤리진행료연구.연구표명,모형대유지정벽은정적최소정저압력적예측비상규모형고2~3 MPa,제승료예측정도;수착암석렬봉경각적증가,기강도선감소후증가;정벽최위안전적지층시렬봉경각위0~20°,경향근수평최소지응력방위,기차시경각60~90°,경향근수평최대지응력방위;유지정벽은정적최소정저압력수착수화후약면내마찰인수급약면점취력적강저이증가,수착응력차적증가이증가.
@@@@Carbonate?rocks?in?westward?oilfield?are?characterized?by?deep?bury,?high?temperature,?rich?in?fracture-cave?and?well?collapse, blocking and burying of testing tool always appear in the open-hole completion well formation in the process of production. The reasons of well collapse have analyzed in this article based on in-situ data, at the same time, since the high temperature and high pressure?of?formation,?comprehensive?prediction?model?about?borehole?stability?has?been?set?up,?considering?with?temperature?field,?flow?field,?fracture?occurrence?and?hydration.?Collapse?mechanism?of?openhole?completion?deep?well?in?high?temperature?hydration?carbon-ate stratum also been analyzed. The research results indicated that the minimum bottom hole pressure of maintain wellbore stability acquired from this model is 2-3 MPa higher than that from other conventional models, which promote prediction accuracy;rock strength increases?at?first?and?then?decreases?with?the?fracture?dip?from?0°?to?90°;?The?most?secure?formation?is?that?the?formation?dip?keeps?in?line?with?direction?of?minimum?horizontal?stress?and?the?fracture?dip?is?lower?than?20°,?besides,?the?second?is?the?condition?that?forma-tion?dip?consistent?with?maximum?horizontal?stress?direction?and?fracture?dip?is?greater?than?60°.?The?minimum?of?bottom?hole?pressure?maintaining?wellbore?stability?increase?with?the?decrease?of?inner?friction?coefficient?and?cohesive?of?weak?surface?after?hydration,?and?increase with stress difference increasing.