新型聚合物钾盐抑制泥页岩水化的性能与机理

doi:10.16085/j.issn.1000-6613.2019-1358

化工进展 ›› 2020, Vol. 39 ›› Issue (S1): 225-231.DOI: 10.16085/j.issn.1000-6613.2019-1358

新型聚合物钾盐抑制泥页岩水化的性能与机理

邵正昌¹(), 伍连松², 刘家才², 王平全²(), 杜琨³, 任妍君², 余永平⁴

^1.中国石油化工股份有限公司中原油田分公司技术监测中心，河南濮阳 457001
^2.西南石油大学石油与天然气工程学院，四川成都 610500
^3.重庆力宏精细化工有限公司，重庆 401336
^4.深圳慧能技术有限公司，广东深圳 518067

收稿日期:2019-08-23 出版日期:2020-05-20 发布日期:2020-06-29
通讯作者: 王平全
作者简介:邵正昌（1986—），男，硕士，研究方向为油田化学、油气田环境监测与保护。E-mail：szc_sinopec@163.com。
基金资助:
国家自然科学基金(51974270)

Performances of a novel potassium polymer on inhibiting shale hydration and the mechanisms

Zhengchang SHAO¹(), Liansong WU², Jiacai LIU², Pingquan WANG²(), Kun DU³, Yanjun REN², Yongping YU⁴

^1.Technical Monitoring Center of Zhongyuan Oilfield, Sinopec, Puyang 457001, Henan, China
^2.College of Petroleum Engineering, Southwest Petroleum University, Chengdu 610500, Sichuan, China
^3.Chongqing Lihong Fine Chemical Co. , Ltd. , Chongqing 401336, China
^4.Shenzhen Huineng Technology Co. , Ltd. , Shenzhen 518067, Guangdong, China

Received:2019-08-23 Online:2020-05-20 Published:2020-06-29
Contact: Pingquan WANG

摘要/Abstract

摘要：

泥页岩水化膨胀是井壁失稳的重要原因。本文通过膨润土压片浸泡与线性膨胀实验、页岩钻屑滚动回收实验以及流变性、滤失性测试，评价了一种新型聚合物钾盐抑制剂聚阴离子纤维素钾（K-PAC）的抑制性能及其对水基钻井液流变性和滤失性的影响。评价结果表明，0.5% K-PAC的抑制泥页岩水化膨胀的性能明显优于5% KCl、2%聚醚胺-D230（PEA-D230），与0.5%聚丙烯酰胺钾盐（K-PAM）相近；0.5% K-PAC的增黏提切、降滤失性能要优于0.5% K-PAM。通过扫描电镜和X射线衍射分析了K-PAC的抑制机理，结果表明，K-PAC的阳离子部分（K⁺）能够进入膨润土晶层中并置换出水化钠离子，从而起到抑制黏土晶层膨胀的作用；K-PAC的阴离子部分吸附在黏土颗粒上起到护胶、降滤失的作用，二者协同增效，从而起到强抑制作用。由于K-PAC由聚阴离子纤维素和K⁺构成，对环境友好、成本低廉。因此，K-PAC具有成为低成本、环保型、强抑制性的水基钻井液抑制剂的巨大潜力。

关键词: 井壁稳定性, 泥页岩水化, 聚合物钾盐, 页岩抑制剂, 吸附, 滤失

Abstract:

The hydration and swelling of shale is an important cause of wellbore instability. In this work, the inhibitive performance of a novel potassium polymer K-PAC and its influences on the rheological and filtration properties of a water-based drilling fluid were evaluated by the immersion test, linear swelling experiment, shale recovery test and rheological and filtration tests. Evaluation results showed that 0.5% K-PAC had a better inhibition property than 5% KCl and 2% poly(propylene glycol)bis(2-aminopropyl ether) (PEA-D230). Although the inhibitive performance of 0.5% K-PAC is similar with 0.5% potassium polyacrylamide (K-PAM), but its influences on the rheological and filtration properties of water-based drilling fluid are better than K-PAM. The inhibition mechanisms were studied by using Scanning Electron Microscopy and X-ray diffraction. K⁺from K-PAC could intercalate into the clay interlayers, followed by expelling water and minimizing the clay swelling. Polyanionic from K-PAC could adsorb on the clay surface, protecting the colloidal properties of drilling fluid and control the filtration loss. The synergistic effect between K⁺ and Polyanionic in K-PAC could lead to a better inhibitive performance. K-PAC is composed of polyanionic cellulose and K⁺, environmentally friendly and low cost. Therefore, K-PAC has a great application potential in water-based drilling fluids which are a low-cost, environmental friendly and have excellent inhibitive performance.

Key words: wellbore stability, shale hydration, potassium polymer, shale inhibitor, adsorption, filtration

中图分类号:

邵正昌, 伍连松, 刘家才, 王平全, 杜琨, 任妍君, 余永平. 新型聚合物钾盐抑制泥页岩水化的性能与机理[J]. 化工进展, 2020, 39(S1): 225-231.

Zhengchang SHAO, Liansong WU, Jiacai LIU, Pingquan WANG, Kun DU, Yanjun REN, Yongping YU. Performances of a novel potassium polymer on inhibiting shale hydration and the mechanisms[J]. Chemical Industry and Engineering Progress, 2020, 39(S1): 225-231.

图/表 8

图1 K-PAC的分子结构式

图2 膨润土压片在不同抑制剂溶液中浸泡24h后的宏观形貌

图3 膨润土压片在不同抑制剂溶液中膨胀高度与时间的关系

图4 泥页岩钻屑在不同抑制剂溶液中的滚动回收率（温度分别为80℃、100℃、120℃；时间为16h）

表1 不同抑制剂对基浆流变性和滤失性的影响

抑制剂	AV/mPa·s	PV/mPa·s	YP/Pa	Gel/Pa	FL_API/mL
空白	6	4.5	3	0.5/0.5	23
5% KCl	1.5	1	1	0/0	155
2% PEA-D230	3.5	3	1	0.5/0.5	50
0.3% K-PAM	20	12	16	8.5/8.5	56
0.5% K-PAM	26.5	16	21	13/13	50
0.3% K-PAC	7.5	6	3	1/1	11.6
0.5% K-PAC	8	6.5	3	1/1	11

图5 不同抑制剂作用下基浆滤饼的实物图

图6 膨润土的XRD谱图

图7 K-PAC作用前后滤饼的SEM图

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新型聚合物钾盐抑制泥页岩水化的性能与机理

Performances of a novel potassium polymer on inhibiting shale hydration and the mechanisms

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