大数据分析顺北油田SHB-X井试采产液量骤降原因

The reasons for sudden production drop by big data analysis in trial production for Well SHB-X in Shunbei oilfield

研究顺北油田SHB-X井试采过程中产液量急剧下降的原因,可以给整个顺北油田乃至深层碳酸盐岩油藏平稳采油提供工作制度选择依据。室内储层敏感性实验评价了3枚岩心柱塞,发现储层可能存在速敏和盐敏,但伤害程度差异较大,与生产实际差距也比较大,均不是产量骤降的主因。钻井液与储层岩石、地下原油配伍性评价表明,储层伤害程度不足以造成停产。遂利用单因素多元回归法分析SHB-X井所在井区7口井100 d生产数据,无人为干预地确定产液指数、产油指数2项产量参数与原油密度、原油黏度等12项影响因素定量关系。权重系数表明,井深大、采油速度高引起的结蜡、沥青质析出堵塞油管是产液量骤减的主控因素。因此,深层碳酸盐岩油气藏生产控制日产液量是平稳采油的关键。

To clarify the reasons for the sharp decline of fluid production in SHB-X well test production in Shunbei Oilfield. The reasons can provide a basis for the selection of stable production parameters for the whole Shunbei Oilfield and even deep carbonate reservoirs. In laboratory reservoir sensitivity evaluation, velocity sensitivity and salinity sensitivity may occur in 3 core plungers, but the degree of damage varies greatly, and there is a big gap with the actual production, which is not the main reason for the sudden drop in production. The compatibility evaluation of drilling fluid with reservoir rock and underground crude oil shows that the damage degree of reservoir is not enough to cause shutdown. The 100-day production data of 7 wells in SHB-X well area were analyzed by single factor multiple regression method. The quantitative relationship between the two production parameters of fluid production index and oil production index and 12 influencing factors such as crude oil density and crude oil viscosity was determined without human intervention. Weight coefficient shows that wax deposition and asphaltene precipitation blockage caused by well depth and high production rate are the main controlling factors for the sudden reduction of fluid production. Therefore, production control of deep carbonate reservoirs is the key to stable production.