水平井优化设计技术在普光气田产能建设中的应用  

An optimal design of horizontal wells applied in the productivity construction of the Puguang Gas Field

作　　者：靳秀菊[1] 毕建霞[1] 刘红磊[1] 王秀芝[2] 李继强[1] 

机构地区：[1]中国石化中原油田勘探开发科学研究院 [2]中国石化石油勘探开发研究院

出　　处：《天然气工业》2011年第5期58-60,118,共3页Natural Gas Industry

基　　金：国家科技重大专项"四川盆地普光大型高含硫气田开发示范工程"(编号:2008ZX05048)

摘　　要：普光气田具有地形复杂、埋藏深、储层相变快、边水发育等特点。为确保气田的高效开发,在论证了采用水平井开发的可行性基础上,研究了水平井优化设计方法。首先,根据边际贡献法测算的钻遇气层厚度下限等技术经济指标,确定了部署水平井的区域;然后,根据单井地质模型,建立水平井与直井产能关系,优化水平段长度;最后,考虑储层展布、构造走向、井网井距、气水关系等因素,优化井身轨迹。结论认为：在气层厚度相对较薄的区域及气水边界附近采用水平井开发可提高气田整体开发水平,优化设计水平段长度控制在400~600 m,Ⅰ、Ⅱ靶点分别距离气层顶、底10 m左右为宜。该技术在普光气田开发井设计中取得了较好的实施效果,对类似气藏的开发具有借鉴意义。The Puguang Gas Field is characterized by complex topography,deep burial depth,fast sedimentary facies transition,and abundant edge water.To ensure the high-efficiency development of this gas field,the optimal design methods have been discussed for horizontal wells after the feasibility of horizontal well development is verified.First of all,according to the technical and economic indexes such as the minimum thickness of the encountered pay zone,which is calculated by use of the contribution margin analysis,the locations for disposing horizontal wells are determined.After that,according to the geological model of a single well,the production relationship between horizontal and vertical wells is established and the length of horizontal section is optimized.Finally,with the reservoir distribution,structural trend,pattern well spacing,and gas/water relations taken into consideration,the wellbore trajectory is optimized.This study shows that the development of this gas field can be improved by adopting horizontal well development at the districts with relatively thin layers or around the gas water boundary.The optimal length of horizontal section is designed as 400-600 m and the targetsⅠand Ⅱ are about 10 m away from the top and bottom of the gas pay zone respectively.This technique has shown such a better performance in practice during the design of development wells at the Puguang Gas Filed as to be used as a reference when developing similar gas reservoirs in the future.

关 键 词：普光气田 开发 水平井 技术经济界限 优化设计 生产能力 井身轨迹优化 

分 类 号：TE377[石油与天然气工程—油气田开发工程]