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/cm^3。
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/cm^3, and the strength of the borehole wall has been greatly enhanced.
出处
《钻井液与完井液》
CAS
北大核心
2016年第2期45-49,共5页
Drilling Fluid & Completion Fluid
关键词
承压增强剂
钻井提速
承压能力
泥饼质量
钻井液
Borehole wall strengthening agent
Speed up ROP
Pressure bearing capacity
Mud cake quality
Drilling fluid
作者简介
第一作者简介：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。
