可溶桥塞在南川页岩气田的应用研究

摘要/Abstract

摘要：

为解决页岩气水平井分段压裂使用连续油管钻复合桥塞时容易遇卡、强磁打捞次数多、工时长等问题,对可溶桥塞的结构和溶解原理进行了深入分析,并根据影响可溶桥塞压裂性能和溶解性能的关键因素,优选了不同耐温性能的可溶桥塞在南川页岩气田进行现场试验。试验结果表明,可溶桥塞在温度112 ℃下可承压差70 MPa,耐温93 ℃的桥塞可完全溶解,耐温120 ℃的桥塞只能部分溶解,与传统复合桥塞相比,单井可节约成本108.7万元。最后得出了影响可溶桥塞压裂性能和溶解性能的主要因素有温度、溶液矿化度和溶解时间,矿化度越高、温度越高,可溶桥塞溶解速率越快,尤其井温对可溶桥塞的溶解效果至关重要。并验证了可溶桥塞在页岩气井分段压裂中的可行性和经济性,对页岩气井压裂施工降本增效有良好的推广应用价值。

关键词: 南川页岩气田, 井温, 可溶桥塞, 分段压裂, 降本增效

Abstract:

There are some problems of drilling composite bridge plug by coiled tubing in staged fracturing of shale gas horizontal wells, such as easy to get stuck, high frequency of strong magnetic fishing and long working hours. In order to solve these problems, deep analyses were carried out on the structure and dissolution principle of soluble bridge plug. And according to the key factors affecting the fracturing and dissolution performance of soluble bridge plug, field tests of soluble bridge plugs with different temperature resistance were carried out in Nanchuan shale gas field. The test results showed that the soluble bridge plugs could bear the differential pressure of 70 MPa under the temperature of 112 ℃. The soluble bridge plugs with heat resistance of 93 ℃ could be completely dissolved, while those with heat resistance of 120 ℃ could be partly dissolved. Compared with traditional composite bridge plug, the cost of a single well was reduced by 1.087 million Yuan. The main factors that affecting the fracturing and dissolution performance of soluble bridge plug were temperature, mineralization degree of solution and dissolution time. The higher the mineralization degree and the temperature were, the faster the dissolution rate of the soluble bridge plug would be. In particular, the well temperature was of great importance to the dissolution effect of soluble bridge plug. The feasibility and economy of soluble bridge plug in staged fracturing of shale gas wells were verified either, which was proved to have application value for cost reducing and efficiency increasing in fracturing of shale gas wells.

Key words: Nanchuan shale gas field, well temperature, soluble bridge plug, staged fracturing, cost reducing and efficiency increasing

中图分类号:

TE37

夏海帮. 可溶桥塞在南川页岩气田的应用研究[J]. 油气藏评价与开发, 2019, 9(4): 79-82.

XIA Haibang. Research and application of soluble bridge plug in Nanchuan shale gas field[J]. Reservoir Evaluation and Development, 2019, 9(4): 79-82.

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耐温/ ℃	硬度/ A	定伸强度/MPa	扯断强度/MPa	伸长率,%	适用井温/ ℃	降解时间/ h
120	90~93	15~18	20~25	250~300	110~137	50~120
120	78~82	15~18	20~25	350~450	110~137	50~120
93	90~93	15~18	20~30	250~350	82~115	50~120
93	78~82	15~18	20~30	380~480	82~115	50~120

井号	桥塞型号	压裂段	数量/支	耐温系列/℃	放喷期间氯离子浓度/（mg·L^-1）	压后处理情况
NC-3HF	GC-1#	7—20	14	93	3 540~13 404	放喷溶解后再探塞检查溶解情况
NC-3HF	GC-1#	2—6	5	120	3 540~13 404	放喷溶解后再探塞检查溶解情况

类别	工具成本	钻塞作业成本	合计成本	合计节约成本
复合桥塞	39.9	160	199.9	108.7
可溶桥塞	91.2	0	91.2	108.7