裂缝性有水气藏水平气井产能分析  

HORIZONTAL WELL PRODUCTIVITY ANALYSIS OF THE FRACTURED WATER-BEARING GAS RESERVOIR

作　　者：郭肖[1] 杜志敏[1] 疏壮志[2] 

机构地区：[1]西南石油大学"油气藏地质及开发工程"国家重点实验室 [2]中国石化南方勘探开发分公司

出　　处：《天然气工业》2006年第9期100-102,共3页Natural Gas Industry

基　　金：国家自然科学基金项目(50474039);四川省应用基础研究项目(04JY029-121)共同资助。

摘　　要：裂缝性有水气藏在川渝地区分布广泛,该类气藏开发存在复杂性。裂缝的存在有助于增加气体流动能力,当气体高速流动时表现为非达西流动。另一方面,裂缝也为钻井、完井液以及边底水侵入气藏提供了便利的通道。侵入水或者钻井、完井液能引起气藏水锁,导致气井产能降低,甚至气井水淹遭到破坏。文章提供了一个简单的预测有水裂缝性气藏水平气井产量公式,模型能考虑非达西流动以及水锁效应对水平气井产量的影响。应用该公式预测了宝元气藏BP1水平气井的产能,分析了水锁效应、非达西流动效应以及含水饱和度变化对该气井的影响。结果表明:以上三个因素引起大量气体圈闭在该气藏中,导致水平气井产量低和气体采出程度低。建议裂缝性有水气藏进行水平气井设计和产能预测时,应综合考虑非达西流动、水锁效应以及含水饱和度变化对水平气井产能的影响。The fractured water-bearing gas reservoirs exist extensively in Sichuan and Chongqing areas. This type of gas reservoir presents complexity in development. The fracture helps increase the gas flowability. At high velocity, the gas flows as Non-Darcy flow. On the other hand, fracture also provides a ready channel for the invasion by drilling fluid, completion fluid, and side or bottom water. Encroached water and drilling/completion fluid block the gas reservoir and reduce gas well productivity or even flood and damage the gas well. This paper presents a simple equation for water-bearing fractured gas reservoir horizontal gas production forecast, which considers the effects of Non-Darcy flow and water block effect on horizontal gas well production. The equation was used to predict Baoyuan Gas Reservoir BP1 horizontal gas well production and analyze the effects of water block effect, Non-Darcy flow and water saturation on gas well. The results showed that due to those three factors, large quantity of gas is trapped in the reservoir and horizontal well productivity and gas recovery decrease. It is recommended that the effect of Non-Darcy flow, water block effect and water saturation shall be considered when designing horizontal well or predicting productivity for the fractured water-bearing gas reservoirs.

关 键 词：裂缝性油气藏 水锁 水平井 非达西流 产量 数学模型 

分 类 号：TE328[石油与天然气工程—油气田开发工程]