CAJ | 학술논문

延长油田致密砂岩气藏水基加砂压裂会产生黏土矿物膨胀、水不溶物及残渣伤害等. 针对延长气田储层的这些难点,在保证压裂效果的前提下, 进一步降低成本, 探索性地开发了清洁二氧化碳泡沫前置液压裂工艺. 在压裂的前置液阶段复配高效低表界面张力的表面活性剂、阳离子与无机防膨剂及液体二氧化碳, 形成清洁泡沫液前置液体系. 室内实验评价表明该压裂液体系受1%~2%KCl稳定剂的影响不大, 黏度差值不到10mPa·s. 耐酸性能良好, 在pH值为3时, 黏度仍可保持在69mPa· s. 破胶液的防膨高度不到3cm, 远优于清水. 耐温、耐剪切性能较好. 现场施工采取了恒定井底排量的工艺技术, 最高泡沫质量达到66. 2%. 压后初期日产量超过5×104m3, 最终稳产在日产8×104m3 以上, 同等规模节省资金超过10%. 工艺效果良好,值得进一步推广应用.
연장유전치밀사암기장수기가사압렬회산생점토광물팽창、 수불용물급잔사상해등. 침대연장기전저층적저사난점,재보증압렬효과적전제하, 진일보강저성본, 탐색성지개발료청길이양화탄포말전치액압렬공예. 재압렬적전치액계단복배고효저표계면장력적표면활성제、 양리자여무궤방팽제급액체이양화탄, 형성청길포말액전치액체계. 실내실험평개표명해압렬액체계수1%~2%KCl은정제적영향불대, 점도차치불도10mPa·s. 내산성능량호, 재pH치위3시, 점도잉가보지재69mPa· s. 파효액적방팽고도불도3cm, 원우우청수. 내온、 내전절성능교호. 현장시공채취료항정정저배량적공예기술, 최고포말질량체도66. 2%. 압후초기일산량초과5×104m3, 최종은산재일산8×104m3 이상, 동등규모절성자금초과10%. 공예효과량호,치득진일보추엄응용.
Clay mineral swelling, water insoluble substance and residual damage may occur for water-based sand fracturing of tight sandstone gas reservoir in Yanchang Oilfield. To tackle with these difficulties, ensure fracturing effect and lower cost, we developed the clean CO2 foam pad fluid fracturing technology. At the pad fluid stage of fracturing, we combined surfactant, positive ion and inorganic anti-swelling agent, and liquid CO2 to form foam pad fluid. Lab experimental evalua-tion showed that clean fracturing fluid was less affected by 1%~2%KCl, and the viscosity different was less than 10 mPa·s. It had good acid resistance and the viscosity could be kept at 69mPa·s when pH value was 3. Anti-swelling height of gel-breaking liquid was less than 3cm, far better than that of clean water. The clean fracturing fluid had better temperature resistance and shear resistance. The technology of constant bottom-hole displacement was applied on the site, with maxi-mum foam quality being 66. 2%. Initial daily output after fracturing exceeded 5×104m3, final output was above 8×104m3, and capitals for equivalent size of fracturing were saved by more than 10%. The new technology had good results and worth being popularized.