新型井壁承压增强剂的制备及评价  

Preparation and Evaluation of New Borehole Wall Strengthening Agent

作　　者：张伟[1] 苗海龙[1] 邓义成[1] 薛凯华[1] 

机构地区：[1]中海油田服务股份有限公司油田化学研究院,河北三河065201

出　　处：《钻井液与完井液》2016年第2期45-49,共5页Drilling Fluid & Completion Fluid

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.

关 键 词：承压增强剂 钻井提速 承压能力 泥饼质量 钻井液 

分 类 号：TE258[石油与天然气工程—油气井工程]