新型井壁承压增强剂的制备及评价

张伟; 苗海龙; 邓义成; 薛凯华

doi:10.3969/j.issn.1001-5620.2016.02.010

新型井壁承压增强剂的制备及评价

doi: 10.3969/j.issn.1001-5620.2016.02.010

中海油田服务股份有限公司油田化学研究院, 河北三河 065201

详细信息

作者简介:
张伟,工程师,硕士,1982年生,毕业于中国石油大学(华东)油气井工程专业,主要从事油气井钻完井液研究工作。电话(010)84528466;E-mail:zhangwei61@cosl.com.cn。

中图分类号: TE258
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出版历程
- 收稿日期: 2015-11-21
- 刊出日期: 2016-03-31

Preparation and Evaluation of New Borehole Wall Strengthening Agent

Oilfield Chemicals R & D Institute, COSL, Sanhe, Hebei 065201, China

摘要

摘要: 海上钻井过程中经常会钻遇易漏层,从而影响钻进速度,严重损害储层。研制了一种由刚性粒子、软性粒子及可变形粒子组成的新型井壁承压增强剂ENPRES-Seal,通过可视砂床实验确定刚性粒子、软性粒子、可变形粒子的配比为2:1:2。评价结果表明,ENPRES-Seal在钻井液中建议加量为2%~3%,其对钻井液流变性影响小,抗温可达200℃,用于钻井液时不糊筛,对孔径为0.180 mm筛的通过率大于85%,能够改善钻井液润滑性能,较好地封堵各孔径砂床,使地层承压能力达17 MPa,且泥饼质量较好。该剂在上海平湖区块一口高温高压井的应用表明,ENPRES-Seal有效地提高了地层承压能力,该井井底温度超过180℃,完钻密度为1.90 g/cm³。
- 承压增强剂 /
- 钻井提速 /
- 承压能力 /
- 泥饼质量 /
- 钻井液
Abstract: Thief zones frequently encountered in offshore drilling often negatively affect drilling speed and do harm to reservoirs.A bore hole strengthening agent,ENPRES-Seal has been developed to enhance the strengths to bear higher pressures that the formationscannot stand before strengthened by ENPRES-Seal.ENPRES-Seal is made of rigid particles,soft particles and deformable particles.Experiments on visual sand bed demonstrated that the mass ratio of the three particles is 2:1:2.Evaluation of ENPRES-Seal shows that the optimum concentration in drilling fluid is 2%-3%,and at this concentration it poses very small effect on the rheology of drilling fluid.ENPRES-Seal can be used at high temperatures as high as 200℃,and it does not blind shale shaker screen;85% of ENPRES-Seal passes 0.180 mm screen.ENPRES-Seal also renders drilling fluid good lubricity.The adsorption of ENPRES-Seal renders formation high compressive strength,as high as 17 MPa,and it also improves the quality of mud cake.ENPRES-Seal has been used on a HTHP well in Block Pinghunear Shanghai,where bottom hole temperature has been as high as 180℃,and mud density at well completion 1.90 g/cm³,and the strength of the borehole wall has been greatly enhanced.
- Borehole wall strengthening agent /
- Speed up ROP /
- Pressure bearing capacity /
- Mud cake quality /
- Drilling fluid

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