水驱砂岩油田开发后期注采结构调整实践与探索  

Comprehensive adjustment of injection production systems in the later stage of sandstone oil reservoir under water flooding.

作　　者：卢军[1] 张继谦 杜学军[1] 薛国勤[1] 

机构地区：[1]河南石油勘探局开发处

出　　处：《石油勘探与开发》1999年第1期43-46,共4页Petroleum Exploration and Development

摘　　要：河南油田东部的稀油区油田（均为普通黑油油藏）为砂岩油田，至１９９７年１０月含水率高达９０．５１％，处于开发后期。由于１９８６年以来重视注采结构的综合调整，１９９６年底核实稀油区水驱采收率为４１．９％，其中的双河油田（主力油田）为４５．５％，调整效果显著。在注水结构调整中，控制超注区域和层段的注水量，提高欠注区域和层段的注水量。井网调整的具体做法是：小区块、小开发单元注水由边外向边内转移；面积较大单元由集中注水向分散注水转移；高含水井注水由主力层向非主力层转移；厚油层由分层注水向分段注水转移。缩小吸水剖面和产液剖面的差异性才能提高存水率，矿场注水结构调整的具体做法是：对储集层物性不同的油田采用分压力、分水质注水；厚油层利用层内夹层细分层段注水，对这样仍达不到配注要求的层段，分层改造后注水。在产液结构调整中，每年对低效、无效油井进行补孔、堵水、转换层系和关井等综合治理，减少平面干扰；厚油层细分成最小流动单元或渗流单元开采，减少层内纵向干扰；产油层细分改造；根据油层的沉积亚相，采取不同的提液对策。砂岩油田水驱开发后期注采结构调整是难度很大的长期工作，要有长期目标和短期运行方案，不断总结、不断调整。表１参４（郭海莉?Conventional oil fields (black oil reservoirs) in east of Henan oil region are sandstone reservoirs with water cut reaching 90.51% as of Oct. 1997, which are in their later stage of development. Structural adjustment of the injection production system has been stressed since 1986, so that the water flooding recovery efficiency of conventional oil fields was 41.9% at the end of 1996, and the recovery efficiency of Shuanghe oil field reached 45.5%, a significant adjustment result is obtained. In the adjustment of injection structure, the overinjected regions and zones (layers) were controlled while those underinjected ones were increased. In the adjustment of well networks, injection system of small blocks and small development units were changed from outer edge to a inner edge injection one, in larger units centralized injection systems were changed to a scattered system; in high water cut well networks, injection intervals were changed from major zones to minor zones; and injection in thick zones changed from separate layer to more sophisticated separate interval injection. Decrease the difference between water intake profile and production profile can increase the efficiency of water holding. Structural adjustment of field injection is: different pressures and different water qualities should be applied to oil fields with different petrophysical properties, itercalutions in thick sandbodies are utilized to carry out sophisticated separate interval injection, in those intervals that the water intake capacity is still lower than the required one, separate interval stimulation is required before water injection. In the structural adjustment of the fluid production, low production and no production oil wells should be reperforated, water shut off, or production interval interchanged or shut in simply to decrease the interference areally; thick production layers are produced in terms of minimum flow units or minimum seepage unites, to decrease the intralayer interference; production l

关 键 词：水驱油田开发 砂岩油田 开发后期 注采结构调整 

分 类 号：TE341[石油与天然气工程—油气田开发工程]