基于椭圆流模型计算压裂后气井产能新思路
A New Idea on Producitivity Calculation of Fractured Gas Well Based on Elliptical Flow Model
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- 引用格式:
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张芨强,李晓平,罗诚,袁淋,杜知洋.基于椭圆流模型计算压裂后气井产能新思路[J].天然气与石油,2015,33(6):0.doi:
Zhang Jiqiang, Li Xiaoping, Luo Cheng, Yuan Lin, Du Zhiyang.A New Idea on Producitivity Calculation of Fractured Gas Well Based on Elliptical Flow Model[J].Natural Gas and Oil,2015,33(6):0.doi:
- DOI:
- 作者:
- 张芨强1,2 李晓平2 罗 诚3 袁 淋4 杜知洋2
Zhang Jiqiang, Li Xiaoping, Luo Cheng, Yuan Lin, Du Zhiyang
- 作者单位:
- 1.中海石油(中国)有限公司湛江分公司，2.西南石油大学油气藏地质及开发工程国家重点实验室，3.中国石油川庆钻探工程公司地质勘探开发研究院，4.中国石化西南油气分公司川东北采气厂
1.NOOC Ltd. Zhanjiang Company;2.State Key Lab of Oil & Gas Geology and Exploration Engineering, Southwest Petroleum University;3.Geological Exploration and Development Research Institute, CNPC Chuanqing Drilling Engineering Co., Ltd., 4.Northeastern Sichuan Production Gas Plant, SINOPEC Southwest Oil and Gas Field Company
- 关键词:
- 低渗透气藏；产能方程；椭圆流；拉梅系数；启动压力梯度；滑脱效应；应力敏感
Low permeability gas reservoir; Deliverability equation; Elliptic flow; Lame coefficient; Threshold pressure gradient; Slippage effect; Stress sensitivity
- 摘要:
- 通常可将低渗透气藏中垂直裂缝井的流动划分为裂缝区域外的椭圆径向流和裂缝内的线性流。基于稳定渗流理论和椭圆流模型，引入椭圆坐标系下的拉梅系数和拟压力，通过对影响气井产能多种因素的考虑，建立了垂直裂缝井在有限导流下的产能预测新模型。新模型计算结果表明：启动压力梯度和应力敏感使气井产能减小；滑脱效应使气井产能增加；裂缝导流能力和裂缝长度的增加使气井产能增加，但一定的裂缝长度对应一个最佳的裂缝导流能力；随着地层污染带半径增大和渗透率降低，气井产能呈下降趋势且下降幅度也在增大。利用新模型公式计算出的无阻流量与实际产能测试结果误差较小，说明推导的产能预测方程具有一定的可靠性。
For vertically fractured wells in low permeability gas reservoir, their flows can be divided into elliptical radial flow outside fracture area and linear flow in fracture area according to its seepage rule. Based on stable percolation theory and elliptic flow model, introduced is the Lame coefficient and pseudopressure in the elliptical coordinates. Analyzed are various factors which may affect gas well productivity and established is a new model for productivity prediction in finite conductivity of vertically fractured wells. The new model calculation results show that gas well productivity will decrease due to the threshold pressure gradient and stress sensitivity effect, the productivity will increase due to the slippage effect and also increase due to the increase of fracture conductivity and fracture length, and the gas well productivity shows a decreasing trend and the decreasing range will increase along with formation damage zone radius increase and permeability decrease. The difference between the open flow capacity calculated by the formula and the actual capacity test results is less, which shows that the derived prediction equation has certain reliability.
