CAJ | 학술논문

通过分析西非深水油田钻井液技术难点，针对钻井液低温流变性调控与井眼清洗问题、气体水合物的生成与控制以及活性泥页岩井壁失稳问题，提出了相应的技术对策，构建了新型深水高性能水基钻井液体系。实验评价表明，该钻井液具有较低的黏度和较高的动切力，φ6读数保持在7~10，有利于井眼清洗；钻井液流变性受低温影响较小，2℃和25℃的表观黏度比和动切力比分别为1.28和1.10。该钻井液在不同层位的泥页岩岩样回收率均在90%以上，抑制性明显优于以往使用的KCl-PHPA钻井液体系，且在动态和静态条件下均具有优良的水合物抑制效果，抗污染能力强，满足西非深水油田钻井液技术需求。
통과분석서비심수유전찬정액기술난점，침대찬정액저온류변성조공여정안청세문제、기체수합물적생성여공제이급활성니혈암정벽실은문제，제출료상응적기술대책，구건료신형심수고성능수기찬정액체계。실험평개표명，해찬정액구유교저적점도화교고적동절력，φ6독수보지재7~10，유리우정안청세；찬정액류변성수저온영향교소，2℃화25℃적표관점도비화동절력비분별위1.28화1.10。해찬정액재불동층위적니혈암암양회수솔균재90%이상，억제성명현우우이왕사용적KCl-PHPA찬정액체계，차재동태화정태조건하균구유우량적수합물억제효과，항오염능력강，만족서비심수유전찬정액기술수구。
Via the analysis on technical dififculties of drilling lfuid for deepwater oil ifeld in the West Africa, in the light of the low-temperature rheological property regulation of drilling lfuid, borehole cleaning, gas hydrate generation and control, and borehole instability of active mud shale, corresponding technical countermeasures have been raised, and a new deepwater high-performance water-based drilling lfuid system has been established. According to the experimental evaluation, the drilling lfuid has relatively low viscosity and relatively high dynamic shear force, andφ6 reading is maintained at 7 to 10, which is beneifcial for the borehole cleaning; the rheological property of drilling lfuid is slightly affected by low temperature; the apparent viscosity ratio at 2℃ and the dynamic shear force ratio at 25℃ are respectively 1.28 and 1.10. The drilling lfuid recovery rate of mud-shale rock sample at different positions is more than 90%. The inhibition of drilling lfuid is obviously superior to that of previously-used KCl-PHPA drilling lfuid system, and has excellent hydrate inhibition effects under dynamic or static conditions. It still has strong anti-pollution capacity, and basically meets the technical requirements of drilling lfuid for deepwater oil ifeld in the West Africa.