B-A8井储层特征及损害因素分析

Reservoir Characteristics and Damage Factors Analysis of Well B–A8

胡碧瑶 石兴廷 郭雷 林章鹏 李晓东

HU Biyao SHI Xingting GUO Lei LIN Zhangpeng LI Xiaodong

中海油能源发展股份有限公司工程技术分公司上海实验中心，上海　200941

CNOOC EnerTech-Drilling & Production Co. Shanghai Central Laboratory, Shanghai 200941, China

为了解决B-A8井投产后出现油气产量的变化和油嘴尺寸变化不吻合的问题，同时为N区块后期的开发提出建议。该文以B-A8井所用的流体和储层岩心为对象，通过孔渗分析、X衍射分析、扫描电镜分析等实验技术获得B-A8井的储层特征，进一步结合储层温压情况和流体性质，分析储层损害的主控因素。结果表明储层为低孔低渗特征，黏土矿物以高岭石和伊利石为主，另有少量绿泥石。孔喉属于微细喉道。B-A8井表现为强盐敏，中等偏弱水敏，弱速敏，同时存在形成无机垢CaCO3和MgCO3的风险。建议后期在N区块开发时尤其注意钻完井以及其他作业工艺中的工艺流程，如工作液类型、速度等条件，避免储层受到严重的敏感性伤害。

The changes in oil and gas production are not accord with injection nozzle sizes changes in Well B-A8. In order to solve this problem, meanwhile provide suggestions for the later development of N Block, this paper took the fluid and reservoir cores of Well B-A8 as study objects, analysed the reservoir characteristics by porosity and permeability analysis, X-ray diffraction analysis, and scanning electron microscope analysis. Combined with the reservoir temperature and pressure and fluid properties, the main controlling factors of reservoir damage were analyzed. The results show that the reservoir is characterized by low porosity and low permeability, and the clay minerals are mainly composed of kaolinite and illite, with a small amount of chlorite. Pore throat radius are usually on micro scale. Well B-A8 is characterized by strong salt sensitivity, moderately weak water sensitivity, and weak velocity sensitivity, and has risk of forming inorganic scales such as CaCO3 and MgCO3. In the later stage of the development of N Block, special attention should be paid to the technological process of drilling and completion and other operating processes, such as the type of working fluid, speed and other conditions, so that it can avoid causing severe susceptibility damage to the reservoirs.

https://doi.org/10.3969/j.issn.1008-2336.2023.01.030