岩性油气藏 ›› 2016, Vol. 28 ›› Issue (4): 88–94.doi: 10.3969/j.issn.1673-8926.2016.04.012

• 技术方法 • 上一篇    下一篇

低渗透气藏气水同产压裂水平井产能计算方法

袁淋1,李晓平2,刘建军3   

  1. (1.中国石化西南油气分公司川东北采气厂,四川阆中637042;2.油气藏地质及开发工程国家重点实验室·西南石油大学,成都610500;3.中国石油长庆油田分公司采气一厂,陕西榆林718500)
  • 出版日期:2016-07-20 发布日期:2016-07-20
  • 作者简介:作者简介:袁淋(1990-),男,硕士,主要从事气藏动态分析以及天然气集输等方面的研究工作。地址:(637402)四川省阆中市七里大道川东北采气厂。E-mail:yuanlin343@163.com。
  • 基金资助:

    国家杰出青年科学基金项目“油气渗流力学”(编号:51125019)资助

Productivity calculation method of fractured horizontal wells with gas-water two-phase in low permeability gas reservoirs

Yuan Lin 1,Li Xiaoping 2,Liu Jianjun 3   

  1. (1. Northeastern Sichuan Gas Production Plant,Sinopec Southwest Oil and Gas Field Company,Langzhong 637402,Sichuan,China;2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China;3. No.1 Gas Production Plant,PetroChina Changqing Oilfield Company,Yulin 718500,Shaanxi,China)
  • Online:2016-07-20 Published:2016-07-20

摘要:

水平井辅以压裂措施开发低渗透气藏已成为全球范围内的趋势,但是气井产水严重地制约了其产能。基于储层和裂缝中气水两相渗流理论,考虑储层应力敏感、气体滑脱效应以及裂缝中气体高速非达西渗流,定义气水两相广义拟压力,利用势的叠加原理,建立了低渗透气藏中气水同产压裂水平井产能新模型。实例应用表明,理论流入动态曲线与实际产能测试数据拟合较好,且计算无阻流量与产能测试结果相对误差较小,仅为5.4%,说明新模型具有较高的准确性。敏感性分析表明,随着裂缝条数、裂缝半长的逐渐增大以及裂缝导流能力的逐渐增强,无阻流量也逐渐增大,但是增大的趋势均越来越平缓;随着水气体积比的逐渐增大,无阻流量明显减小。该项研究可为低渗透气藏气水同产压裂水平井产能预测以及压裂优化设计提供一定的借鉴。

Abstract:

Developing low permeability gas reservoirs with horizontal well technology supported by hydraulic fracturing has become the trend globally, while gas well with water restricted the productivity seriously. Based on the filtration theory of gas-water two?phase in the reservoir and hydraulic fracture, considering stress sensitivity and slippage effect in reservoirs, as well as high velocity non - Darcy flow in the hydraulic fracture, this paper defined the generalized pseudo pressure of gas-water two-phase, and used the theory of potential superimposition to establish a new productivity model of fractured horizontal wells with gas-water two-phase in low permeability gas reservoirs. Case study shows that theoretical inflow performance relationship(IPR)curve is in a good coincidence with the actual test data; moreover,the relative error of absolute open flow calculated by the new model is small compared with that calculated productivity test, just 5.4%, which indicates the high accuracy of the new model. Sensitivity analysis result demonstrates that as the increasing of the number, half length and conductivity of fracture, the absolute open flow increases, but the increasing trend becomes more and more gentle, while as the increasing of water-gas volume ratio, the absolute open flow decreases obviously. This study is helpful for productivity prediction and fracture optimization design of fractured horizontal wells with gas-water two?phase in low permeability gas reservoirs.

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