CAJ | 학술논문

针对大庆油田中浅层致密油藏水平井钻井过程中常发生造浆、缩径和剥落掉块等问题，在对致密油储层岩心进行电镜扫描、铸体薄片分析等的基础上，利用聚胺、聚合醇的“两元协同”作用提高钻井液的抑制性，利用常规物理封堵与聚合醇化学封堵相结合的“双效”封堵作用提高钻井液对微裂缝的封堵能力。采用宏观与微观相结合的抑制性评价方法优选了聚胺抑制剂，并选用与其具有良好配伍性的聚合醇等处理剂，形成了抑制性突出、封堵能力强和润滑性良好的高性能水基钻井液。室内试验结果表明，高性能水基钻井液泥页岩滚动回收率大于95％，缝宽10～50μm的微裂缝累计出液量小于2mL，极压润滑系数仅为0.10。该钻井液在大庆油田致密油藏的9口水平井进行了应用，均效果显著，其中龙26平9井的井径扩大率仅为9.31％，最高机械钻速达10.58m／h。研究表明，高性能水基钻井液能够满足大庆油田致密油藏的钻井需求。
침대대경유전중천층치밀유장수평정찬정과정중상발생조장、축경화박락도괴등문제，재대치밀유저층암심진행전경소묘、주체박편분석등적기출상，이용취알、취합순적“량원협동”작용제고찬정액적억제성，이용상규물리봉도여취합순화학봉도상결합적“쌍효”봉도작용제고찬정액대미렬봉적봉도능력。채용굉관여미관상결합적억제성평개방법우선료취알억제제，병선용여기구유량호배오성적취합순등처리제，형성료억제성돌출、봉도능력강화윤활성량호적고성능수기찬정액。실내시험결과표명，고성능수기찬정액니혈암곤동회수솔대우95％，봉관10～50μm적미렬봉루계출액량소우2mL，겁압윤활계수부위0.10。해찬정액재대경유전치밀유장적9구수평정진행료응용，균효과현저，기중룡26평9정적정경확대솔부위9.31％，최고궤계찬속체10.58m／h。연구표명，고성능수기찬정액능구만족대경유전치밀유장적찬정수구。
During the drilling of middle-shallow tight oil reservoirs in the Daqing Oilfield ,mud mak-ing ,hole shrinkage ,caving and other downhole complications are frequently observed .To evaluate the problem ,SEM and cast slice analyses were performed on core samples taken from tight reservoirs ,and synergistic effects of polyamine and polyalcohol were used to enhance the inhibition performances of drill-ing fluids .By jointly using conventional physical plugging techniques and chemical plugging using polyal-cohol ,the plugging performances of drilling fluids in micro-fractures were enhanced significantly .By using assessment techniques with a combination of macrofacies and microfacies ,polyamine inhibition additives with optimal performances were identified .In addition ,with deployment of polyalcohol and other additives with satisfactory compatibility ,a high-performance water-based drilling fluid with outstanding inhibition and plugging performance was generated .Lab test results showed that the high-performance water-based drilling fluid had rolling recovery rates above 95% for shale ,with total fluid production from micro-frac-tures with sizes of 10 50 μm less than 2 mL ,and with lubrication coefficients under extreme pressures at merely 0.10 .The new drilling fluid was then deployed in 9 wells drilled in tight oil reservoirs in the Daqing Oilfield w here it achieved outstanding performance .In Well Long26-Ping9 ,an expansion of the borehole diameter was no more than 9.31% ,whereas the highest ROP was 10.58 m/h .Research results showed that the high-performance water-based drilling fluid could meet demands for development of tight oil reser-voirs in the Daqing Oilfield .