多段压裂水平井压力动态特征分析

Dynamical pressure characteristics of multi-stage fractured horizontal well

赵超¹ 肖洁² 许正栋³ 吴友梅³ 丁志文⁴ 王一帆¹

中国石油大学（石油）石油工程教育部重点实验室，北京 102249 中国石油华北油田公司勘探开发研究院，河北 任丘 062552 中国石油北油田公司采油工程研究院，河北 任丘 062552 中国石油塔里木油田分公司勘探开发研究院，新疆 库尔勒 841000

MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing 102249, China Research Institute of Exploration and Development, Huabei Oilfield Company, PetroChina, Renqiu 062552, China Oil Production Engineering Research Institute, Huabei Oilfield Company, PetroChina, Renqiu 062552, China Research Institute of Exploration and Development, Tarim Oilfield Company, PetroChina, Korla 841000, China

考虑压裂水平井人工裂缝变导流能力的影响，建立了致密气藏多段压裂水平井试井新模型，运用数学物理方法求解得到半解析解。绘制了典型无因次拟压力和拟压力导数曲线，将气体流动划分为双线性流、线性流、过渡阶段拟径向流、过渡阶段线性流、早期拟径向流、拟稳态窜流和晚期拟径向流等7个阶段；分析了变导流能力裂缝和应力敏感效应对拟压力和拟压力导数曲线的影响，变导流能力裂缝主要影响早期流动阶段，应力敏感效应主要影响晚期流动阶段，应力敏感系数越大，晚期拟压力和拟压力导数曲线“上翘”得越高。该模型对致密气藏进行更精确的试井解释具有一定指导意义。

Considering the variable conductivity of artificial fractures, a multi-stage fractured horizontal well testing model for tight gas reservoir has been established, and the semi-analytical solution of the model is obtained by math-physics method. The curves of dimensionless pseudopressure and pseudopressure derivative are plotted, according to the curves, the gas flow can be divided into seven flow regimes: bilinear flow, linear flow, intermediate-time radial flow, intermediate-time linear flow, early-time pseudo-radial flow, pseudo-steady cross flow and late-time pseudo-radial flow. The effects of variable conductivity fracture and stress sensitivity to pseudopressure and pseudopressure derivative curves are analyzed. Variable conductivity fractures mainly affect the early flow regimes and the stress sensitivity effect mainly affects the flow in late stage. The type curves will ascend with the increasing of stress sensitivity coefficient. The model has certain guiding significance for more precise well testing interpretation of tight gas reservoirs.

10.6056/dkyqt201506026