隔夹层发育碎屑岩气藏水平井开发对策研究

水平井开发气藏时,储层内的隔夹层对水平井渗流会产生屏障作用,延长流体流入井筒的时间,使储层内流体的渗流变得复杂.在时不同沉积方式所形成的碎屑岩储层隔夹层发育特征进行分析的基础上,提出相应的水平井开发对策.在隔夹层发育的储层内部署水平井,应尽量避开隔夹层;当储层发育与层面平行的稳定型夹层时,可采用阶梯式水平井、多分支井;储层内发育与层面平行的较稳定夹层时,可在夹层之间或夹层间隙上部或下部布井.侧积沉积方式所形成的与层面斜交夹层发育于砂体上部,水平井应靠近砂体下部部署;前积沉积方式所形成的与层面斜交夹层发育于砂体下部,水平井应靠近砂体上部部署;与层面斜交夹层发育的储层,水平井均应与夹层层面垂直.

Developing strategy of interlayer gas reservoir with horizontal well

Using horizontal well to develop gas reservoir, the interlays are the fluid flow barrier of reservoir, which delay the reser-voir gas flowing to wells, and make the reservoir gas flowing complex. Base on analysis ofinterlays' characteristics formed with different depositional modes, this paper proposes developing strategy of interlayer gas reservoir with horizontal well. The horizontal well should keep away from the interlays. When reservoir occur continuous and parallel with formation interlay, stepped horizontal well, multilateral wells should be planed; and when reservoir occur unstable interlay and parallel with formation, the horizontal well should be planed between the interlay section, or its upside and downside. The incline interlay formed in lateral accretion, lie in the upside of sand body, horizontal well should planed in downside of sandbody. The incline interlay formed in progradation, lie in the downside of sand body, horizontal well should be planed in upside of sandbody, and the horizontal well all should be vertical with the incline interlay face.