Study on Compatibility of an Anti-Contamination Agent with Cement Slurries and Drilling Fluids
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摘要: 针对川渝地区深部地层钻完井过程中水泥浆与钻井液相容性差导致的混合体系异常增稠问题，研发出一种用在隔离液中的抗污染剂DRP-2S。该抗污染剂DRP-2S通过其羧酸基团配位作用和空间位阻-静电协同稳定机制，调控混合体系的流变特性，且DRP-2S与水泥浆和隔离液中外加剂/外掺料均不反应。实验研究表明，当隔离液中添加DRP-2S后，控制其pH值为7时，对水泥浆与钻井液混合后调控能力最佳；温度适应性实验证实DRP-2S在60℃、90℃和120℃环境下均能改善水泥浆与钻井液的不相容问题。现场实验表明，将抗污染剂DRP-2S应用于川渝地区X探井的油层套管回接固井施工，顺利通过了水泥浆与油基钻井液的相容性实验，且固井合格率达到99.5%。为水泥浆与钻井液异常增稠现象提供了解决方案，具有重要的指导意义。Abstract: In deep well drilling and completion in Chuanyu area, drilling fluids mixed with cement slurries generally became highly viscous because of the poor compatibility between the drilling fluids and the cement slurries. An anti-contamination agent DRP-2S has been developed for use in spacers to deal with this problem. DRP-2S regulates and controls the rheology of a mixture of a drilling fluid and a cement slurry through the coordination action of its carboxyl groups and the steric-electrostatic effects synergistic stabilization mechanism, and it does not react with any chemicals added or blended into the cement slurry and the spacer. Experimental studies show that a spacer treated with DRP-2S has the best control of the properties of the cement slurry-drilling fluid mixture when the pH of the spacer is set at 7. Experiments on the temperature adaptability show that DRP-2S can improve the compatibility between cement slurries and drilling fluids at 60℃, 90℃ and 120℃. In field application, DRP-2S was used in the production casing tie-back operation of the exploration well X in the Chuanyu area, and successfully solved the compatibility problem between the cement slurry and the oil-based drilling fluid, and the qualification rate of well cementing reached 99.5%. This study has provided a solution to the abnormal thickening of cement slurries and drilling fluids, and has important guiding significance to well cementing operation.
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Key words:
- Anti-contamination agent /
- Well cementing /
- Cement slurry /
- Drilling fluid /
- Spacer /
- Compatibility
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