碳酸盐岩缝洞型油藏产水机理及控水措施研究

A RESEARCH ON WATER PRODUCING MECHANISM AND WATER CONTROLLING MEASURES FOR FRACTURE-CAVE TYPE CARBONATE RESERVOIR

塔河油田4区奥陶系油藏是典型的复杂碳酸盐岩油藏。油藏开发进入高含水之后,油井产液量急剧降低,油井出水问题已经成为该油田开发的突出问题,严重制约着油田采收率。以塔河油田4区主力缝洞单元S65与S48为研究对象,在归纳出缓慢出水型、突发上升型、间歇出水型等3种产水类型油井基础上,利用地震、钻井、测井等资料,结合生产动态特征进一步分析3种类型油井的产水机理。据此提出合理、有效的控水措施:缓慢出水型油井在单元低部位注水保持能量;突发上升型油井应考虑堵水、上返高部位侧钻;间歇出水型油井考虑关井压锥,堵水控制水窜范围和规模。措施效果明显,可指导该类油藏高效开发。

The Ordovician reservoir in block 4 of Tahe Oilfield belongs to typical complex carbonate reservoir.When the reservoir development enters the stage of high water cut,the well fluid production decreases sharply,well outflow water has become a major problem in oilfield development which restricts the oil recovery.Taking S65 and S48 fracture-eavity units in block 4 of Tahe Oilfield for example,based on the summary of three types of water-producing including slow outflow water,sudden outflow water,and intermittent outflow water,this article analyzes corresponding mechanisms of water producing according to production dynamic characteristic by using the drilling,logging,seismic data and so on.The reasonable and effective measures for water controlling is proposed:injecting water to maintain energy in lower part for slow outflow water;adopting the plugging water and sidetracking in the higher part for sudden flow water;adopting shut-in coning control method for intermittent outflow water.These water controlling measures for the scale and scope of water-plugging and water channeling can guide the development of this kind of reservoir effectively.