Research and application of soluble bridge plug in Nanchuan shale gas field

XIA Haibang

doi:10.13809/j.cnki.cn32-1825/te.2019.04.015

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Research and application of soluble bridge plug in Nanchuan shale gas field
Issue 4, Pages: 79-82+88(2019)
Published：2019
DOI： 10.13809/j.cnki.cn32-1825/te.2019.04.015
稿件说明：

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DOI：

XIA Haibang. Research and application of soluble bridge plug in Nanchuan shale gas field[J]. Petroleum Reservoir Evaluation and Development, 2019, (4): 79-82+88. DOI： 10.13809/j.cnki.cn32-1825/te.2019.04.015.

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。

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.

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references

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