抗盐高性能水泥浆体系研究与应用

丹美涵

doi:10.3969/j.issn.1001-5620.2021.02.020

抗盐高性能水泥浆体系研究与应用

doi: 10.3969/j.issn.1001-5620.2021.02.020

丹美涵

中海油研究总院有限责任公司, 北京 100028

详细信息

作者简介:
丹美涵,工程师,1987年生,硕士毕业于南开大学高分子化学专业,主要从事钻采技术与工程规划研究。E-mail:danmh@cnooc.com.cn

中图分类号: TE256.6
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出版历程
- 收稿日期: 2020-12-11

Study and Application of a High-Performance Salt-Resistant Cement Slurry

DAN Meihan

CNOOC Research Institute Company Limited, Beijing 100028

摘要

摘要: 伊拉克米桑油田井底普遍存在高压盐膏层，由于盐层蠕变致使井径缩小、冲蚀和溶解盐层导致水泥浆含盐量越来越高、密度窗口窄、顶替效率低等难点给固井质量带来挑战。针对目前常用的半饱和NaCl溶液或者（3%～5%） KCl溶液配浆存在的水泥石抗压强度低，界面胶结差的问题，优选含有25% NaCl和5% KCl高盐混合水配制水泥浆，配套抗盐降失水剂、分散剂、缓凝剂等外加剂，解决了因高盐混合水配浆可能带来的水泥浆增稠、触变等问题，构建了一种抗盐高性能水泥浆体系。室内研究表明，该套水泥浆体系能抑制盐的溶解，配制密度为2.39 g/cm³的水泥浆，最低只需加入30%铁矿粉，在降低水泥浆成本的同时大幅度提高了水泥石的抗压强度，使其24 h抗压强度可达48 MPa，较目前应用水平提高近一倍；水泥浆污染后24 h强度依然大于14 MPa，能够保证米桑油田盐膏层固井质量，可在伊拉克米桑油田推广应用。
- 米桑油田 /
- 盐膏层 /
- 抗盐水泥浆 /
- 胶结性能
Abstract: High-pressure salt and gypsum beds prevail in the Missan Oilfield in Iraq. In well cementing, tight hole resulting from the creeping of salt layers, increasing salinity of cement slurries from hole washout and salt dissolution, narrow drilling window and reduced displacing efficiency pose challenges to the well cementing jobs. Cement slurries formulated with semi-saturated NaCl solution and 3%-5% KCl solution are widely used presently and have the shortages of low compressive strength of set cement and poor bonding between casing string and cement sheath and between cement sheath and bore hole wall. To solve these problems, a cement slurry was formulated with a slat solution containing 25% NaCl and 5% KCl, and other additives of choice, such as filter loss reducer, dispersant and retarder. As a high-performance salt-resistant cement slurry, it is free from the high rheology and high thixotropy previously encountered when cement slurries are brought into contact with salt. Laboratory study showed that this cement slurry is able to inhibit the dissolution of salt. A cement slurry of 2.39 g/cm³ can be made with only 30% hematite at a minimum, which not only saves money, but also greatly improves the compressive strength of the set cement. The 24-hour compressive strength of this cement slurry is 48 MPa, almost doubling the compressive strengths of the set cement of cement slurries presently in use. The 24-hour compressive strength of the cement slurry being contaminated is still greater than 14 MPa. These characteristics of the new cement slurry satisfy the needs of cementing the salt and gypsum beds in the Missan Oilfield, Iraq, making the cement slurry worth spreading in this oilfield.
- Missan oilfield /
- Salt and gypsum beds /
- Salt-resistant cement slurry /
- Bonding performance

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