Title

Systematic evaluation of propped fracture conductivity in Yanchang gas reservoir

作者

吴向阳李刚李国勇陈静

单位

延长油田股份有限公司杏子川采油厂，陕西延安 717400

Organization

Xingzichuan Oil Production Plant, Yanchang Oilfield Co. Ltd., Yan′an 717400, China

摘要

为了指导延长气藏的压裂改造开发，对延长气藏压裂改造中常用的支撑剂进行了支撑裂缝导流能力测试并确定测试介质和压裂液破胶的影响。采用灰色关联分析，确定不同支撑剂铺置方式中影响因素的敏感程度。研究表明：铺砂量一定，支撑剂导流能力随闭合压力增加而降低；闭合压力一定，支撑裂缝导流能力随铺砂量增加而增加；支撑剂组合的导流能力随低目数支撑剂占比增加而逐渐增大。裂缝前端铺置小粒径支撑剂，可以防砂和支撑微裂缝，裂缝中部铺置中等粒径起主要的支撑作用，大粒径的则处于缝口位置支撑缝口。受滑脱效应影响，采用气体测量得到支撑裂缝导流能力相比液体测量更高；支撑裂缝导流能力与压裂液破胶程度呈反相关关系；单一类型支撑剂，铺砂量影响最大，其次为气体流量和支撑剂等效目数、闭合压力；2种类型支撑剂组合，气体流量的影响最大，其次为支撑剂等效目数、闭合压力；3种类型支撑剂组合，支撑剂等效目数影响最大，其次为气体流量、闭合压力。

Abstract

In order to guide the development of Yanchang gas reservoir, propped fracture conductivity test system is employed to test the propped fracture conductivities of single type and type combination proppants and make sure the influence of testing medium and fracturing fluid gel-breaking; the grey correlation analysis is introduced to analyze the sensitivity of various factors. The results show that: when the paved-sand content is constant, the propped fracture conductivity decreases as the pressure increases; when the pressure is constant, the propped fracture conductivity increases as the paved-sand content increases; proppant combination conductivity increases as the content of lower mesh increases. The fine particle size proppant is placed in the front of fracture for sand control and micro-fracture propped; the middle particle size proppant is placed in the middle of fracture for propping the fracture; the big particle size proppant is placed in the fracture mouth for propping. The gas measured conductivity is higher than liquid measured one for the slippage effect; there is inverse correlation between the propped fracture conductivity and fracturing fluid gel-breaking degree; when there is only single type proppant, the paved-sand concentration is the most important factor, followed by gas flow rate, proppant mesh and pressure; while there are two kinds of proppants, gas flow rate is the most important factor, followed by proppant equivalent mesh and pressure; when there are three kinds of proppants, the influence of equivalent mesh is the most important, followed by gas flow rate and pressure.

关键词：

支撑剂; 导流能力; 裂缝; 灰色关联; 压裂改造
;

Keywords:

propped fracture; fracture conductivity; fracture; grey correlation; fracture stimulation
;

基金项目

DOI

10.6056/dkyqt201801015

延长气藏压裂改造支撑裂缝导流能力系统评价