水平气井酸化后产能研究新方法

doi:10.3969/j.issn.1673-8926.2015.02.019

Lithologic Reservoirs ›› 2015, Vol. 27 ›› Issue (2): 119-125.doi: 10.3969/j.issn.1673-8926.2015.02.019

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A new method to study the productivity of horizontal gas well after acidizing

YUAN Lin¹， LI Xiaoping¹， YAN Yichen²， WANG Xiaolei¹， CHENG Ziyang¹

1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation ， Southwest Petroleum University ， Chengdu 610500 ， China ；2. No. 10 Oil Production Plant ， PetroChina Changqing Oilfield Company ， Qingyang 745600 ， Gansu ， China

Online:2015-03-03 Published:2015-03-03

Abstract

Abstract:

The technology of horizontal well acidizing had been widely used in developing the gas field, but because of the particularity of flow pattern of horizontal well and damage mode near the wellbore, the fluid seepage in formation will become more and more complex after acidizing, so the study on productivity after acidizing will be of great importance. Based on the non-uniform distribution of damage zone and acidizing zone near the horizontal wellbore, this paper divided the composition area near the wellbore into several homogeneous regions, used the method of displacement between two similar flow modes to get a new method to calculate the skin factor of horizontal well after acidizing, considered the pressure drop in the wellbore, and coupled the wellbore conduit flow and formation seepage. Case study shows that the productivity of horizontal well was greatly increased after acidizing, meanwhile, as the increasing of gas reservoir thickness, permeability of acidizing zone and the distance of acid-rock reaction, the production-increasing ratio also increases, but as the increasing of permeability of damage zone and distance of mud immersion, the productionincreasing ratio decreases.

Key words: low permeability reservoir, developing with water flooding, horizontal well, oil-water two phase, productivity of oil well

YUAN Lin， LI Xiaoping， YAN Yichen， WANG Xiaolei， CHENG Ziyang. A new method to study the productivity of horizontal gas well after acidizing[J].Lithologic Reservoirs, 2015, 27(2): 119-125.

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