无固相甲酸盐钻井液体系在龙深区块的研究与应用

发布时间：2018-04-24 06:10

本文选题：无固相 + 甲酸盐钻井液　；参考：《东北石油大学》2017年硕士论文

【摘要】：常规水基钻井液,固相含量偏高,导致体系抑制性偏低、粘切高,粘土颗粒易吸附于钻头表面,制约着机械钻速的提高;油基钻井液配制及维护成本较高,且对环境有一定的影响,无害化处理费用投入较大,制约该体系的推广应用。为进一步提高机械钻速、缩短钻井周期,确保井下安全,满足保护储层的要求,研究具有较强抑制能力、低粘切的抗高温无固相钻井液,已成为重要的技术途径。无固相甲酸盐钻井液体系是一种无毒的水基钻井液,不仅符合环保要求,而且抗温性能好、水力特性好、有良好的抑制性和抗污染能力,特别是与油层有良好的配伍性,油气层保护效果好。本文对无固相甲酸盐钻井液的作用机理进行了研究,并通过室内研究,优选出具有理想的高温流变性,强抑制、防塌、润滑功能等特点的钻井液体系:采用溶解度较高的甲酸盐作为加重剂,与增粘剂、降滤失剂、聚合醇类储层保护剂复配使用,减少水分子向地层的浸入,起到较好的抑制、防塌作用,同时具有理想的高温稳定性,满足了环保要求,避免了常规有固相钻井液对储层的伤害。在吉林龙深区块的现场试验结果表明,无固相甲酸盐钻井液,能够有效保护储层,提高单井产量。
[Abstract]:The high solid content of conventional water-based drilling fluid leads to low system inhibition, high viscosity and high viscosity. Clay particles are easily adsorbed on the surface of drill bit, which restricts the increase of drilling speed, and the cost of oil based drilling fluid preparation and maintenance is high. And it has a certain influence on the environment, and the cost of harmless treatment is large, which restricts the popularization and application of the system. In order to further improve the drilling speed, shorten the drilling cycle, ensure downhole safety and meet the requirements of reservoir protection, it has become an important technical approach to study drilling fluid with strong inhibition ability and low viscosity and shear resistance to high temperature and solids free. Solid-free formate drilling fluid system is a kind of non-toxic water-based drilling fluid, which not only meets the requirements of environmental protection, but also has good temperature resistance, good hydraulic characteristics, good inhibition and anti-pollution ability, especially good compatibility with oil layers. The effect of oil and gas reservoir protection is good. In this paper, the mechanism of formate drilling fluid without solid phase is studied, and through laboratory study, ideal high temperature rheology, strong inhibition and anti-sloughing are selected. The drilling fluid system with the characteristics of lubricating function and so on: using formate with high solubility as weighting agent, combined with tackifier, filtrate reducer and polyol reservoir protectant to reduce the infiltration of water molecules into the formation and play a better inhibition. At the same time, it has ideal high temperature stability, meets the environmental protection requirements and avoids the damage to reservoir caused by conventional solid drilling fluid. The field test results in Longshen block of Jilin Province show that the solids free formate drilling fluid can effectively protect the reservoir and increase the single well production.
【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】：TE254

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