Mechanism of Contact Contamination between Shale Inhibitors and Well Cement Slurries and Solutions Thereto
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摘要: 为解决水泥浆与钻井液接触污染问题，需选择对水泥浆污染较为严重的钻井液处理剂进行研究，明确其污染机理，找到解决方法。页岩抑制剂DFZ-7作为常用钻井液处理剂之一，对水泥浆性能影响显著。借助流动度测试、抗压强度测试、XRD、IR、TG以及SEM等表征方法，探究DFZ-7对水泥浆性能影响及污染机理，并提出有效的抗污染策略。实验结果表明，在水化早期阶段，DFZ-7中的活性基团会与水泥颗粒表面的金属阳离子络合形成网状结构，该结构会导致自由水移动受阻，使得水泥浆流动度下降，稠度升高。由氨基三亚甲基膦酸（ATMP）和二氧化钛（TiO2）以质量比5∶1进行复配制备的抗污染剂KW通过螯合作用和填隙作用解决了DFZ-7对水泥浆的污染，掺入5%KW后，水泥浆流动度由17.6 cm恢复至23.8 cm，90 ℃下养护1 d时的水泥石强度由1.56 MPa提升至8.74 MPa，在205 ℃×125 MPa×110 min实验条件下混合浆体（水泥浆∶钻井液=7∶3）的稠化时间为55 min，使用KW后混合浆体（水泥浆∶钻井液∶隔离液=7∶2∶1）的稠化时间增加至353 min，满足施工要求，水泥石中由DFZ-7络合形成的网状结构减少，水化产物含量增加，KW的掺入能够在未改变水泥浆水化产物成分的前提下，解决DFZ-7与水泥浆的接触污染。Abstract: To solve the contact contamination between a cement slurry and a drilling fluid, drilling fluid additives that impose serious contamination to the cement slurry are selected and studied to understand their mechanisms of contamination and to find ways of preventing the contamination. As one of the commonly used drilling fluid additives, shale inhibitor DFZ-7 has significant effects on the rheology of the cement slurry. The effects of DFZ-7 on the performance of the cement slurry and its contamination mechanism were investigated by means of fluidity test, compressive strength test, XRD, IR, TG and SEM etc., and as a result of the investigation, an effective anticontamination strategy was developed. Experimental results show that at the early stage of cement hydration, the active groups in the DFZ-7 molecules can complex with the metallic cations on the surfaces of the cement particles to form network structures which hinder the movement of free water, causing the fluidity of the cement slurry to decrease and the viscosity thereof to increase. An anticontamination agent named KW was prepared by mixing aminotrimethylenephosphonic acid (ATMP) and titanium dioxide (TiO2) in a mass ratio of 5∶1. KW can be used to solve the contamination of DFZ-7 to the cement slurry through chelation and interstitial action. By adding 5% KW in the cement slurry, the fluidity of the cement slurry returned from 17.6 cm to 23.8 cm, and the strength of the set cement aging at 90 ℃ for 1 d was increased from 1.56 MPa to 8.74 MPa. A mixture of the cement slurry and a drilling fluid (cement slurry∶drilling fluid = 7∶3) had a thickening time of 55 min under the test conditions of 205 ℃ × 125 MPa × 110 min. After treatment with KW (cement slurry∶drilling fluid∶spacer = 7∶2∶1), the thickening time of the mixture was increased to 353 min, satisfying the needs of operation. In the set cement, the number of the network structures generated by DFZ-7 complexation decreased and the content of hydration products increased. The incorporation of KW can solve the contact contamination to the cement slurry by DFZ-7, without changing the composition of the hydration products of the cement slurry.
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Key words:
- Shale inhibitor /
- Well cement slurry /
- Contamination mechanism /
- Anticontamination agent
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