海上稠油多元热流体吞吐开发效果评价初探

A 油田是海上首个实施非常规稠油热采开发的先导试验区，其开发效果的评价直接影响着海上后续非常规稠油资源的开发动用。根据热采井的生产动态特征分析了边水对热采井开发效果的影响，建议热采井距边水200～300 m以上；通过对比分析同井注热前后及同层位相邻位置冷热采井的开发效果，热采井周期平均产能和累产油量均是冷采井的1.5～2.0 倍左右；利用流温法及米采油指数法综合评价了热采有效期，有效期在240～339 d，平均298 d；根据钻后热采井周期平均产能、周期产油量及油汽比等参数与钻前设计值进行对比评价，认为排除试验阶段防砂工艺、管柱问题以及钻后储层变化等原因外，其他热采井均达到第一轮次吞吐预期效果，热采井周期平均产能为57 m3/d，周期产油量1.80×104 m3、周期增油量0.7×104 m3。可见多元热流体吞吐热采増油效果明显，对海上其他非常规稠油油田的开发具有借鉴指导意义。

Thermal Recovery Effect Evaluation of Multi-thermal Fluid#br#Stimulation in Offshore Heavy Oilfield

Oilfield A is the first pilot test spot of thermal recovery in offshore unconventional heavy oil field. The developmenteffect will directly affect the future development of offshore unconventional heavy oil resources. Based on production performanceof thermal recovery well in Oilfield A，the influence of edge water on the development effect of thermal recovery wellswas analyzed，and we proposed distance from thermal recovery well to edge water to be more than 200～300 m. A comparisonbetween normal and thermal production of the same well，and between the production of thermal recovery well and adjacentnormal production well in the same layer showed that early productivity and the first annual oil production of thermal recoverywells are both 1.5 to 2.0 times as normal production wells. Integrated evaluation method was performed using bottom holetemperature and productivity index data，and we analyzed the valid period of thermal recovery well，which is between 240 to339 days，298 days on average. The values of cycle average capacity，oil production and oil-steam ratio were compared to thepre-drilling design value，and the results showed that without considering sand control technology，drill string problems andreservoir property change，thermal recovery wells have reached the expected results of the first cycle，with the average capacityof 5 m3/d，cycle oil production of 1.80×104 m3；and the incremental oil production of 0.7×104 m3. The thermal recovery effectof multi-thermal fluid stimulation is obvious，and will guide the development of other offshore unconventional heavy oil field.