低渗透底水气藏压裂井见水时间预测模型改进研究  

Optimization of Water Breakthrough Time for Fractured Wells in Low Permeability Gas Reservoirs with Bottom Water

作　　者：明瑞卿 张全立 罗淮东 黎小刚 陈刚[3] Ming Ruiqing;Zhang Quanli;Luo Huaidong;Li Xiaogang;Chen Gang(CNPC Engineering Technology R&D Company Limited,Beijing 102206,China;CNPC International(Chad)Co.,Ltd.,Beijing 100034,China;PetroChina Southwest Oil&Gasfield Company,Chengdu 610051,China)

机构地区：[1]中国石油集团工程技术研究院有限公司,北京102206 [2]中油国际(乍得)有限责任公司,北京100034 [3]中国石油西南油气田公司,成都610051

出　　处：《地质科技情报》2019年第6期91-95,共5页Geological Science and Technology Information

基　　金：中国石油天然气集团有限公司科学研究与技术开发项目“深层与复杂地层钻完井新技术新方法研究”课题“钻井破岩、降阻、清屑智能建模与协同控制方法研究”(2019A-3909);中国石油天然气股份有限公司科学研究与技术开发项目“膨胀管裸眼封阻技术与装备现场试验”(2017F-19)

摘　　要：目前低渗透底水气藏压裂井见水时间预测模型考虑了压裂裂缝的导流能力,但忽略了近井区域气相非达西效应和地层表皮效应对计算模型的影响,导致见水时间的预测发生偏差。鉴于此,基于气相平面径向流和半球形向心流相结合的底水锥进模型,以渗流理论为基础,综合考虑气相非达西效应和地层表皮效应的影响,推导出低渗透底水气藏压裂井见水时间预测新模型。实例应用表明,本模型预测的见水时间更切合实际;压裂井可明显延缓底水锥进;气相非达西效应和地层表皮效应会加速底水锥进;随着裂缝半长与气藏打开程度的增大,压裂井见水时间呈现出先增大后减小的趋势,存在最优值。该研究成果为低渗透底水气藏压裂井见水时间的预测提供了理论依据。Current popular models for calculating water breakthrough time are established based on the impact of crack conductivity ability without considering skin effects and non-Darcy effects of near wellbore area, resulting in significant difference between prediction and realistic result.In order to solve the problem,we built a water conning physical model for fractured wells in low permeability gas reservoirs with bottom water.The gas layer was opened partly in gas wells, with the gas flowing in radial flow form inside the perforation section, and combined with radial flow and semispherical flow below the perforation section.With the aid of seepage theory,a new formula was derived considering skin effects and gas non-Darcy effects.Case study indicates that the time calculated by the new formula has less error as compared with the value obtained by practical data.The fracturing postpones the process of water breakthrough and the skin effects and gas non-Darcy effects accelerate the process of water breakthrough.With the increase of perforation degree and fracture half-length, water breakthrough time increases at first and then decreases,maintaining the optimization value.The research achievements in the paper provide a theoretical basis for predicting water breakthrough time for fractured wells in low permeability gas reservoirs with bottom water.

关 键 词：低渗透 底水气藏 压裂井 气相非达西效应 地层表皮效应 见水时间 

分 类 号：P634[天文地球—地质矿产勘探]