二连盆地吉32块稠油热采特征及后续开采方式研究

Thermal recovery characteristics and later recovery method study of viscous crude oil of Ji32 fault block, Erlian basin.

方法根据吉３２试验区的地质条件，结合生产实际，应用干扰剔除法和数值模拟技术，进行蒸汽吞吐开采特征研究，提出了后续开采方式。目的研究生产特征、优选合理的技术参数，为该区稠油大规模开发提供依据。结果采用７０ｍ井距正方形井网蒸汽吞吐方式生产四个周期后，蒸汽吞吐生产阶段基本结束；蒸汽吞吐效果集中在前两个周期，该阶段产量递减快、无稳定生产期；注汽井间干扰频繁，使回采水率高，并且含水曲线呈锯齿状；注汽强度、注汽速度均较低；注汽压力随周期增加而降低。结论选择合理的油层厚度，既能保证热采的地质基础，又能减小层间差异；优选合理的注汽参数，可保证蒸汽质量，充分利用注入热能，扩大波及体积；井间干扰对提高蒸汽吞吐效果有利，但应避免汽窜；该区后续开采方式不适合蒸汽驱，应先补孔。

MethodBased upon the geological setting of pilot area of Ji-32 and actual production performance, the recorery characteristics by steam soaking is studied applying disturbance extracting method and numerical simulation technique, and later recovery method is then raised. PurposeTo study the production characteristics and optimize reasonable technical parameters for the purpose of providing development basis of large scale development of viscous crude oil of this area. ResultSteam soaking stage comes to an end after four production cycles by square well pattern of 70 m well spacing. The effect of steam soaking concentrates on the first two cycles which is represented as rapid production declining, no stable production period, frequent interwell interference of gas injection wells, high retwrn water recovery rate, and saw-like water cut curve, low steam injection intensity and rate, and also that the injection pressure decreases with the increasing of cycles. ConclusionReasonable oil reservoir thickness should be chosen to ensure the geological basis of thermal recovery and minimize interlayer discrepancies as well; Reasonable steam injection parameters should be optimized which can ensure steam quality; Make full use of the injected heat energy and enlarge the swept volume; Interwell disturbance is good to improve steam soaking effect however, steam channelling should be avoided. Steam flooding is not suitable for later production. Complmentary perforating should be run first and inject hot water of 120 to displace the oil.