Gelling acid fracturing experiment in Maokou marl formation of Nanchuan area

XIA Haibang; BAO Kai; WANG Rui; XIONG Wei

doi:10.13809/j.cnki.cn32-1825/te.2021.02.014

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Gelling acid fracturing experiment in Maokou marl formation of Nanchuan area
Issue 2, Pages: 101-106(2021)
Published：2021
DOI： 10.13809/j.cnki.cn32-1825/te.2021.02.014
稿件说明：

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[1]夏海帮,包凯,王睿,熊炜.南川区块茅口组泥灰岩胶凝酸酸压试验[J].油气藏评价与开发,2021,11(02):101-106. DOI： 10.13809/j.cnki.cn32-1825/te.2021.02.014.

XIA Haibang, BAO Kai, WANG Rui, et al. Gelling acid fracturing experiment in Maokou marl formation of Nanchuan area[J]. Petroleum Reservoir Evaluation and Development, 2021, (2): 101-106. DOI： 10.13809/j.cnki.cn32-1825/te.2021.02.014.

摘要

南川区块二叠系茅口组泥灰岩气藏储层低孔低渗、碳酸盐岩含量高、裂缝不规则发育但连通性差、地层非均质性强

常规酸压技术直接进行储层改造的方法存在酸岩反应迅速、溶蚀距离有限等问题。结合该区块茅口组典型地质特征

开展了胶凝酸液实验测试与评价

筛选了以"多级交替注入酸压+闭合酸化"为主的增黏性强、配伍性好、稳定可降解的胶凝酸液体系

并在南川区块DS1HF井首次成功试验应用

取得了10 mm油嘴生产制度下

测试稳产气量23.05×10

/d的良好效果

验证了该项工艺技术在泥灰岩气藏中的应用可行性

对国内同类气藏的开发有良好的借鉴和推广应用价值。

Abstract

The marl gas reservoir of the Permian Maokou Formation in the Nanchuan area is characterized by low porosity and low permeability

high carbonate content

irregular fracture development

poor connectivity and strong heterogeneity.The conventional acid fracturing technology used to transform the reservoir directly has the problems such as the rapid reaction of acid under the reservoir conditions

and limited dissolution distance.Based on the typical geological characteristics of the Maokou Formation in this area

experimental testing and evaluation of the gelling acid system has been selected.A gelling acid system with strong viscosity

good compatibility stability and degradability in the mode of "multistage alternati

ng injection of acid fracturing+closed acidizing" is screened.The gelling acid system has been successfully applied in Well-DSIHF in Nanchuan area for the first time

and the stable production is 23.05×10

/d under the production system of 10 mm nozzle.The good results verify that the application of this technology in marl gas reservoirs is feasible.It has a good reference and application for the development of similar gas reservoirs in China.