A区块低渗透油层固井完井伤害评价

发布时间：2018-04-06 07:11

本文选题：低渗透油田　切入点：钻井液　出处：《东北石油大学》2017年硕士论文

【摘要】：本文主要介绍了低渗透油田A区块的油层保护技术。A区块存在一定的速敏性,损害程度较轻,属于中~强水敏性,其水敏系数在0.20~0.50之间,临界盐度为2500mg/L,为中等偏弱盐敏,酸敏性为中等,其酸敏指数大约在0.30~0.60之间,碱敏性较弱,基本无损害。本文以保护油层钻井液、完井液、水泥浆和射孔技术难点入手,主要对钻井液和完井液对油气层的伤害、固井过程中水泥浆对油气层的伤害以及射孔技术解除钻井完井污染进行分析研究。优选的两性离子聚合物钻井液适合于A区块低渗透油层钻井需要,具有较好的抑制性,膨胀率小于2.0%。钻井液的固相不能侵入岩心孔隙中,在压差的作用下,滤液的侵入深度小于10cm,渗透率的伤害率小于10%。控制水泥浆对油层伤害的主要途径是控制水泥浆的失水,由于钻井液滤饼的作用及加入高效降滤失剂,水泥浆的失水量从1000mL降至28mL,滤液的侵入深度小于5cm,渗透率的伤害率小于10%。优选出的射孔液伤害小,恢复率大,能够解除钻井液的堵塞。通过实验分析研究,得出了钻井液、完井液对油层的伤害特点以及固井过程中对油层的伤害特点,确立了完井过程中油层保护策略、固井过程中油层保护策略以及射孔过程中的油层保护策略,达到了良好的油层保护效果,现场试验亦获得了成功,满足了该区块的油层保护要求。
[Abstract]:This paper mainly introduces the technology of low permeability oilfield A block.A reservoir protection block velocity sensitivity of the damage to a lesser extent, belonging to the ~ of strong water sensitivity, the water sensitive coefficient between 0.20~0.50 and 2500mg/L for critical salinity, medium weak salt sensitivity, acid sensitivity is medium, the acid sensitive index between about 0.30~0.60, alkali sensitivity is weak, almost no damage. In this paper, drilling fluid, completion fluid, cement slurry and perforation of the technical difficulties, the main damage of drilling fluid and completion fluid of oil and gas, cement slurry in the process of damage to oil and gas well drilling and completion of perforating technology to relieve pollution analysis of zwitterionic polymer drilling fluid is preferably suitable for low permeability reservoir of A Block drilling needs, can inhibit the better, not less than 2.0%. rate of expansion of solid phase invasion of drilling fluids in the pore, in the role of pressure difference, filtrate The penetration depth is less than 10cm, the permeability damage rate is less than 10%. control of cement slurry is the main way of formation damage control water cement slurry, the drilling fluid filter cake and the effect of adding high filtration reducing agent, water loss of the cement slurry from 1000mL to 28mL, the filtrate invasion depth is less than 5cm, permeability damage the rate of perforation fluid damage is less than 10%. the selected small, high recovery rate, can relieve the blockage of drilling fluid. Through experimental analysis, the damage characteristics of oil drilling fluid, completion fluid damage characteristics of reservoir and cementing process, established the reservoir protection strategy in the process of completion, reservoir protection strategy in the process of cementing reservoir protection strategy and in the process of perforating, achieved good reservoir protection effect, field test also achieved success, to meet the requirements of reservoir protection in the block.

【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE258

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