裂缝性气藏水平井稳态解公式研究

首先推导了了均质各向异性气藏水平井产能公式，在推导过程中考虑油藏各向异性，井底附近非达西流动对水平井产能的影响，并推导出了垂直井，水平井由于非达西流动引起的附加压降比值公式；其次，推导出裂缝性气藏水平井产能公式，并进一步推导出了低渗透压裂性气藏水平井产能公式，该公式考虑了气藏各向异性，裂缝高度，气体从裂缝流向井筒非达西流动等因素对水平井产能的影响。

A STUDY OF PRODUCTIVITY FORMULAS OF HORIZONTAL WELLS IN A FRACTURED GAS RESERVOIR

The literature about productivity of a horizontal well in a gas reservoir has litt1e been published. The paper first derivesproductivity formula of horizontal wells in a homogeneous anisotropy gas reservoir, during the process of derivation, factors,such as anisotropy of reservoir, non-Darcian flow around horizontal wellbore, which have influence on productivity, areconsidered, and the non-Darcian pressure drop formula of the horizontal/vertical wells ratio is given. Secondly, the paperderives productivity formulas of horizontal wells in a fractured gas reservoir and fractured horizonta1 wells in low permeabi1itygas reservoir, which consider the effects of fracture height and non-Darcian flow that gas flows from fractures to wellbore, onproductivity of horizontal wells. Finally, the paper illustrates how non-Darcian flow influences productivity of horizontalwells and vertical wells.