炮眼暂堵室内实验研究
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摘要
暂堵分层与转向压裂技术在非常规储层改造中起到非常重要的作用,其工艺为通过投入暂堵球与其他暂堵材料封堵射孔孔眼,强制压开低渗层段实现纵向改造。但是对炮眼暂堵形态与规律的认识远远不足。选用最大封堵压力和暂堵剂用量作为评价参数,开展了炮眼暂堵室内实验。实验结果表明,小于炮眼直径的暂堵球无法封堵炮眼;通过对暂堵材料配方的优选,明确了暂堵过程规律为暂堵球坐封炮眼,小颗粒有助于架桥,纤维聚集形成承压封堵;排量越大,越快形成暂堵,用量越少;暂堵球坐封炮眼后承压可达30 MPa以上。该研究结果对理解炮眼暂堵规律具有指导意义。
The temporary plugging and diverting plays a very important role in the unconventional reservoir stimulation.The low permeability section could be stimulated by forcing biodegradable temporary plugging balls and other temporary plugging materials to block other perforation holes,achieving longitudinal stimulation. But the understanding of the plugging morphology and law is far from enough. Taking the maximum plugging pressure and temporary plugging amount as evaluation parameters,the experiment of temporary plugging was carried out.The experimental results show that the temporarily plugging balls with diameter smaller than the perforations cannot block the hole. Through optimizing the formulation of temporary plugging materials,it is known that the temporary plugging process is that ball seals the hole,the small particles help to bridge and the fiber gathers to form a pressure plugging. The larger the pump rate,the faster the formation of the temporary plug,the less the pumping material amount. Positive breakthrough pressure after plugging is ≥30 MPa. The results of this study have practical significance in understanding the law of temporary plugging.
The temporary plugging and diverting plays a very important role in the unconventional reservoir stimulation.The low permeability section could be stimulated by forcing biodegradable temporary plugging balls and other temporary plugging materials to block other perforation holes,achieving longitudinal stimulation. But the understanding of the plugging morphology and law is far from enough. Taking the maximum plugging pressure and temporary plugging amount as evaluation parameters,the experiment of temporary plugging was carried out.The experimental results show that the temporarily plugging balls with diameter smaller than the perforations cannot block the hole. Through optimizing the formulation of temporary plugging materials,it is known that the temporary plugging process is that ball seals the hole,the small particles help to bridge and the fiber gathers to form a pressure plugging. The larger the pump rate,the faster the formation of the temporary plug,the less the pumping material amount. Positive breakthrough pressure after plugging is ≥30 MPa. The results of this study have practical significance in understanding the law of temporary plugging.
引文
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[11]汪道兵,周福建,葛洪魁,等.纤维强制裂缝转向规律实验及现场试验[J].东北石油大学学报,2016,40(3):80-88.
[2]肖晖,李洁,曾俊.投球压裂堵塞球运动方程研究[J].西南石油大学学报(自然科学版),2011,33(5):162-167.
[3] Nozaki M,Zhu D,Hill A. Experimental and Field Data Analyses of Ball Sealer Diversion[J]. SPE Production&Operations,2013,28(3):286-295.
[4]郑志兵.暂堵球封堵效果影响因素分析及其在Z油田的应用[J].石化技术,2017(2):55-56.
[5]熊颖,郑雪琴,龙顺敏.新型储层改造用暂堵转向剂研究及应用[J].石油与天然气化工,2017,46(2):59-62.
[6] Xue S,Zhang Z,Wu G,et al. Application of a Novel Temporary Blocking Agent in Refracturing[C]//SPE Asia Pacific Unconventional Resources Conference and Exhibition. 2015.
[7]孙洪波,王文斌,董庆强.分层压裂技术的分析探讨[J].中国石油和化工标准与质量,2012,33(16):59-59.
[8]冯炜,王文斌,董福建,等.气体携砂数值分析方法[J].断决油气田,2018,25(4):502-505.
[9]卢修峰,刘凤琴.投球分压的理论验证及实例分析[J].石油钻采工艺,1994,16(3):57-60.
[10]李勇明,翟锐,王文耀,等.堵塞球分层压裂的投球设计与应用[J].石油地质与工程,2009,23(3):125-126.
[11]汪道兵,周福建,葛洪魁,等.纤维强制裂缝转向规律实验及现场试验[J].东北石油大学学报,2016,40(3):80-88.