Feasibility of Network Acidification in the Naturally Fractured Gas Reservoir

GOU Bo, GUO Jian-Chun, HE Chun-ming, LU Deng-yun, ZHANG Ming-you

doi:10.11764/j.issn.1672-1926.2014.07.1090

Natural Gas Geoscience >

2014 , Vol. 25 >Issue 7: 1090 - 1096

DOI: https://doi.org/10.11764/j.issn.1672-1926.2014.07.1090

Feasibility of Network Acidification in the Naturally Fractured Gas Reservoir

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1.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University, Chengdu 610500, China; 2.Langfang Branch of Research Institute of Petroleum Exploration and Development, CNPC, Langfang 065007, China；3.The No.2 Exploration Co.,Tarim Petroleum Exploration and Development Commanding Headquarters, CNPC, Korla 841000, China

Received date: 2013-07-19

Revised date: 2013-09-06

Online published: 2014-07-10

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Abstract

he pay formation of structural high position in T gas reservoir had complex lithology,grown natural fractures and was damaged seriously by drilling fluids,as a result,the conventional acidizing treatment was not effective.Based on the lab simulation with scanning electron microscopy (SEM) analysis,the paper explained the damage mechanism of T gas pool's natural fracture reservoir during drilling process,and explored the feasibility of network acidification.The results of experiment shows that the fracture permeability decrease by more than 85% due to the polluted drilling mud and the damage is worse,as the natural fracture widen.On the condition that the fracture reservoir has high hydrochloric acid dissolution rate (more than 20%),the network acidification is safe and highly efficient,and it can remove the damage of mud cake on the fracture face when either of the amounts of acid as well as displacement is two to three times as many as the conventional acidification.However,the risks of failure in the reservoirs with low hydrochloric acid dissolution rate (less than 10%) are quite high.The field application indicates that network acidification for appropriate reservoir is more efficient than conventional acidification,and it also can be used for the study of the other similar reservoirs,such as T gas pool.

Key words： Network acidification; Naturally fractured reservoir; Drilling fluid damage; Conventional acidification;Dissolution rate; Field test

Cite this article

GOU Bo, GUO Jian-Chun, HE Chun-ming, LU Deng-yun, ZHANG Ming-you . Feasibility of Network Acidification in the Naturally Fractured Gas Reservoir[J]. Natural Gas Geoscience, 2014 , 25(7) : 1090 -1096 . DOI: 10.11764/j.issn.1672-1926.2014.07.1090

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