氯化钾溶液浓度影响页岩气储层解吸能力室内实验

郑力会; 魏攀峰; 楼宣庆; 孙昊; 付毓伟; 聂帅帅

doi:10.3969/j.issn.1001-5620.2016.03.024

氯化钾溶液浓度影响页岩气储层解吸能力室内实验

doi: 10.3969/j.issn.1001-5620.2016.03.024

1.
中国石油大学(北京)石油工程学院, 北京 102249
2. 油气钻井技术国家工程实验室防漏堵漏技术研究室, 武汉 431000

基金项目: 国家自然科学基金创新研究群体项目“复杂油气井钻井与完井基础研究”（51221003）、国家科技重大专项课题“‘三气’合采钻完井技术与储层保护”（2016ZX05066002）。

详细信息

作者简介:
郑力会,1968年生,博士生导师,楚天学者特聘教授,主要从事防漏堵漏和吸附气储层伤害防治研究。电话(010)89732207;E-mail:zhenglihui@cup.edu.cn。

中图分类号: TE257.6
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出版历程
- 收稿日期: 2016-03-01
- 刊出日期: 2016-05-31

Laboratory Experiments on the Effect of KCl Concentration on Desorption Capacity of Reservoir Rocks

1.
College of Petroleum Engineering, China University of Petroleum, Beijing 102249
2. Research Team of Lost Circulation Control, National Key Oil and Gas Drilling Engineering Laboratory, Wuhan, Hubei 431000

摘要

摘要: 页岩气储层伤害研究未涉及钻井完井流体盐浓度对储层解吸能力的伤害。参照常规储层敏感性评价的岩样尺度，用不同浓度KCl溶液作为污染流体研究了解吸盐敏。室内用直径为38 mm的龙马溪组页岩柱塞模拟储层，控制温度为60℃、围压为20 MPa，每8 min用气相色谱仪检测柱塞入口出口端纯度为99.99%的甲烷气变化，入口出口速率相等时，认为柱塞吸附饱和，在初始压差0.001～0.01 MPa下连续测量224 min原始解吸总量和解吸速率。用同样柱塞，再次吸附饱和后用3.5 MPa压力封闭出入口端，控制压力不变，在出口端以0.1 mL/min的速度注入2000、5000、10000、20000以及40000 mg/L的KCl溶液伤害页岩柱塞1 h，然后在与测量原始解吸总量和解吸速率相同的条件下测量伤害解吸总量和解吸速率，每种浓度溶液进行2次平行实验。甲烷平均解吸总量随着KCl溶液浓度增加由原始0.009209、0.007758、0.007708、0.006502、0.008027 mmol降为0.000565、0.004263、0.004232、0.003229、0.003441 mmol，解吸总量伤害率为93.74%、45.22%、44.90%、50.20%、57.09%；平均解吸速率由原始0.000041、0.000035、0.000040、0.000029、0.000036 mmol/min降为0.000005、0.000020、0.000025、0.000016、0.000018 mmol/min，解吸速率伤害率为85.78%、36.87%、35.42%、38.88%、47.34%。表明KCl溶液浓度影响页岩气储层解吸量和解吸速率，为钻井完井流体及储层改造流体提出性能界限。
- 页岩气井 /
- 储层伤害 /
- 吸附 /
- 解吸 /
- 解吸敏感 /
- 解吸盐敏 /
- 敏感程度
Abstract: In studying the damages to shale gas reservoirs, the damages to the desorption capacity of reservoir formations caused by the salinity of drilling/completion fluids have not been studied. In our laboratory studies, a shale piston plunger (diameter=38 mm) made from the Longmaxi formation was used to simulate the reservoir formations. In the experiment, temperature was controlled to 60℃, and confining pressure to 20 MPa. The flowrates of the methane (purity 99.99%) at both the inlet and outlet of the piston plunger were measured every 8 min with gas chromatograph. If the flowrate at the inlet and the flowrate at the outlet were equal, then the piston plunger can be regarded as saturated with adsorbed methane. At initial pressures ranging between 0.001 MPa and 0.01 MPa, the original total desorption volume and rate of desorption were measured for a consecutive 224 min period. The same piston plunger was re-saturated with methane, and the inlet and outlet were sealed with a constant pressure of 3.5 MPa, then inject at the outlet into the piston plunger with KCl solution of 2000, 5000, 10000, 20000 and 40000 mg/L at a rate of 0.1 mL/min, and contaminate the piston plunger for 1 h. Measured the total desorption volume and rate of desorption at the same conditions as when measuring the original total desorption volume and rate of desorption. The measurement for each KCl concentration was tested twice. With an increase in KCl concentration, the average total desorption volume of methane decreased from the original 0.009209, 0.007758, 0.007708, 0.006502 and 0.008027 mmol to 0.000565, 0.004263, 0.004232, 0.003229 and 0.003441 mmol, respectively, and the percentages of damage to the total desorption volume were 93.74%, 45.22%, 44.90%, 50.20% and 57.09%, respectively. The average rates of desorption decreased from the original 0.000041, 0.000035, 0.000040, 0.000029 and 0.000036 mmol/min to 0.000005, 0.000020, 0.000025, 0.000016, 0.000018 mmol/min, respectively, and the percentages of damage to the rate of desorption were 85.78%, 36.87%, 35.42%, 38.88%, 47.34%, respectively. These experiment results demonstrate that the concentration of KCl solution will affect the desorption volume and rate of desorption of the shale gas reservoir rocks, and they provide a reference to the design of drilling/completion fluids and stimulation fluids.
- Shale gas well /
- Reservoir damage /
- Adsorption /
- Desorption /
- Desorption sensitivity /
- Salt sensitivity during desorption /
- Sensitivity

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参考文献(17)

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氯化钾溶液浓度影响页岩气储层解吸能力室内实验

doi: 10.3969/j.issn.1001-5620.2016.03.024

作者简介:
郑力会,1968年生,博士生导师,楚天学者特聘教授,主要从事防漏堵漏和吸附气储层伤害防治研究。电话(010)89732207;E-mail:zhenglihui@cup.edu.cn。

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Laboratory Experiments on the Effect of KCl Concentration on Desorption Capacity of Reservoir Rocks

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氯化钾溶液浓度影响页岩气储层解吸能力室内实验

doi: 10.3969/j.issn.1001-5620.2016.03.024

作者简介: 郑力会,1968年生,博士生导师,楚天学者特聘教授,主要从事防漏堵漏和吸附气储层伤害防治研究。电话(010)89732207;E-mail:zhenglihui@cup.edu.cn。

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出版历程

Laboratory Experiments on the Effect of KCl Concentration on Desorption Capacity of Reservoir Rocks

计量

出版历程

目录

作者简介:
郑力会,1968年生,博士生导师,楚天学者特聘教授,主要从事防漏堵漏和吸附气储层伤害防治研究。电话(010)89732207;E-mail:zhenglihui@cup.edu.cn。