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延长油田油气资源丰富,但多为低渗致密油气藏,储层具有应力敏感性,并且流体在地层中的流动为非达西流动,需要克服一定的启动压力梯度。低渗油层的主要增产措施为水力压裂,在地层中形成垂直裂缝,效果明显。本文针对低渗油层的非达西流动,引入渗透率模数表示地层的应力敏感性,建立考虑井筒存储和表皮系数的垂直裂缝井的双线性流模型,采用Newton-Raphson方法进行求解,绘制压力和压力导数的双对数曲线,并分析各参数对曲线的影响。。
The Yanchang oilfield is rich in oil and gas resources, but most of them are low permeability and tight reservoirs. The reservoirs are stress sensitive, and the fluid flow in the strata is non-Darcy flow. A certain starting pressure gradient needs to be overcome. The main measures to increase production of low permeability reservoirs are hydraulic fracturing. Vertical fractures are formed in the strata, and the effect is obvious. In this paper, the non-Darcy flow of low permeability reservoirs is introduced, the permeability modulus is introduced to indicate the stress sensitivity of the formation, and the bilinear flow model of vertical fracture wells considering wellbore storage and skin factor is established. The Newton-Raphson method is used to solve the problem. Double logarithmic curve of pressure and pressure derivatives and analyze the effect of each parameter on the curve. .