应用改进的产能模拟法确定安岳气田磨溪区块储集层物性下限  

Application of Improved Productivity Simulation Method in Determination of the Lower Limits of Reservoir Physical Properties in Moxi District of An'yue Gas Field

作　　者：王璐[1] 杨胜来[1] 徐伟[2] 孟展[1] 韩伟[1] 钱坤[1] WANG Lu;YANG Shenglai;XU Wei;MENG Zhan;HAN Wei;QIAN Kun(MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing 102249, China;Research Institute of Exploration and Development, Southwest Oil & Gas Field Company, PetroChina, Chengdu, Sichuan 610041, China)

机构地区：[1]中国石油大学石油工程教育部重点实验室,北京102249 [2]中国石油西南油气田分公司勘探开发研究院,成都610041

出　　处：《新疆石油地质》2017年第3期358-362,共5页Xinjiang Petroleum Geology

基　　金：国家973项目(2015CB250900);国家科技重大专项(2016ZX05015-003)

摘　　要：常规产能模拟法是在确定气藏储集层物性下限过程中近似地将单井生产压差设定为产能模拟的实验压差,但由于岩心尺度与单井控制区域尺度相差较大,导致岩心出口端的流体流速与油气井井筒端的流体流速并不相等,使预测结果误差较大。为此,对常规产能模拟法进行改进,在进行产量相似换算之前加入了压差相似转换,根据换算后的结果设定实验压差,确保流体流速相等。将改进的产能模拟法应用到安岳气田磨溪区块以确定储集层物性下限。研究结果表明,在气井生产压差为6.0 MPa,产层有效厚度为40 m的条件下,利用改进的产能模拟法确定的孔隙度下限为2.74%,渗透率下限为0.015 mD;常规产能模拟法确定的孔隙度下限为2.42%,渗透率下限为0.011 D;改进的产能模拟法确定的储集层物性下限值要稍高一些。改进的产能模拟法确定的储集层物性下限更加准确。During the process of determination of the lower limits of gas reservoir physical properties with conventional productivity simulation method,the well producing pressure differential is approximately set as the experimental pressure differential for productivity simulation.However,the core size and single well control area are quite different,resulting in the fluid flow rate at core outlet?end not equal to that at wellbore end,leading to relatively large error in predicted results.Therefore,the conventional productivity simulation method should be improved.Similarity transformation of pressure differential is added before production similarity conversion,based on which experimental pressure differential is set to guarantee the equal fluid flow rate.The improved productivity simulation method is used to determine the lower limits of reservoir physical properties in Moxi district of An’yue gas field.The result shows that the lower limits of porosity and permeability determined by the improved productivity simulation method are2.74%and0.015mD,respectively when the producing pressure differential is6MPa and the net pay thickness is40m in gas wells;while the lower limits of porosity and permeability determined by the conventional productivity simulation method are2.42%and0.011mD,respectively,which is slightly lower than those determined by the improved method.The lower limits of reservoir physical properties determined by the improved productivity simulation method are more accurate.

关 键 词：安岳气田 磨溪区块 产能模拟法 储集层物性下限 压差转换 

分 类 号：TE37[石油与天然气工程—油气田开发工程]