Chemical Industry and Engineering Progress ›› 2020, Vol. 39 ›› Issue (S1): 225-231.DOI: 10.16085/j.issn.1000-6613.2019-1358

• Fine chemicals • Previous Articles     Next Articles

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. 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:2020-06-29 Published:2020-05-20
  • Contact: Pingquan WANG

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. 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
  • 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)

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

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

CLC Number: 

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