Reasons of low yield and stimulation measures for CBM wells in Junlian area

Authors

LI Ying, Integration Center of Exploration and Development, Zhejiang Oilfield Company, Hangzhou 310023, China
ZHENG Rui, Integration Center of Exploration and Development, Zhejiang Oilfield Company, Hangzhou 310023, China
LUO Kai, Southwest Gas Production Plant, Zhejiang Oilfield Company, Yibin 644000, China
ZHU Yanming, Southwest Gas Production Plant, Zhejiang Oilfield Company, Yibin 644000, China
ZHANG Yimin, Southwest Gas Production Plant, Zhejiang Oilfield Company, Yibin 644000, China

Abstract

Coalbed methane fields in Junlian area have good development potential, but the existence of a large number of low-production and low-efficiency wells has restricted the increase of productivity. This paper analyzes the coupling relationship between high-productivity wells and geological factors from the perspective of geological engineering integration, analyzes the causes of inefficient wells from three aspects of geology, drainage and engineering, and evaluates the corresponding reform measures. The results show that the formation of inefficient wells in the north and the west of the study area is mainly affected by gas-bearing properties, fault distribution, production horizons, production and drainage rhythms, and fracturing channeling wells. High-production wells in the middle and the south area have low water production, low flow pressure, long drainage time, low pulverized coal production and high TDS. For the treatment of low yield wells, it is found that the pickling effect is better, the secondary hydraulic fracturing needs to strictly control the construction parameters, and the effect of shock plugging is not obvious. The treatment of low-yield and low-efficiency wells for coalbed methane should start from the deployment of well locations, and carry out well location design and construction management around the integration of geology-engineering-discharge production.

Keywords

coalbed methane, causes of low yield wells, stimulation measures, pickling effect, secondary hydraulic fracturing, Junlian of Sichuan

DOI

10.3969/j.issn.1001-1986.2020.04.021

Recommended Citation

LI Ying, ZHENG Rui, LUO Kai, et al. (2020) "Reasons of low yield and stimulation measures for CBM wells in Junlian area," Coal Geology & Exploration: Vol. 48: Iss. 4, Article 22.
DOI: 10.3969/j.issn.1001-1986.2020.04.021
Available at: https://cge.researchcommons.org/journal/vol48/iss4/22

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