煤层气井合理排采工作制度的研究与应用

发布时间：2018-06-24 19:38

  本文选题：煤层气井 + 排采制度　； 参考：《钻采工艺》2017年01期

【摘要】：煤层气井顺利投产需要前期合理有序的降压,文章依据产气时间、产气量、产水量以及储层压力、废气压力五个指标划分煤层气井生产阶段:排水降压至产气前阶段、气液两相流阶段、稳产气阶段和气井衰竭阶段;第一阶段以稳定降压为主,结合动态预测模型、考虑煤层气井产气滞后现象,确定每日降液面值,在排采工艺上井下管柱安装防砂筛管;第二阶段以控制排液速度为主,结合最小携带煤粉的排液速度,确定每日最小降液面,在排采工艺上采用高压软管通过油套环空向井下注入水稀释煤粉浓度;第三第四阶段以控制套压满足集输为主。通过现场试验分析得出,调整排采制度和工艺措施后,煤层气井产量提高,检泵周期延长,对于煤层气井开发具有一定的指导意义。
[Abstract]:The production stage of coalbed methane well is divided according to the five indexes of gas production time, gas production rate, water production, reservoir pressure and exhaust gas pressure: drainage pressure is reduced to gas production stage. The gas-liquid two-phase flow stage, the stable gas production stage and the gas well failure stage, the first stage is the stable depressurization stage, combined with the dynamic prediction model, considering the gas production lag phenomenon of the coalbed gas well, the daily down-liquid face value is determined. The sand control sieve pipe is installed in the downhole pipe string in the drainage process. In the second stage, the main purpose of the second stage is to control the liquid discharge speed, combining with the minimum discharge speed of carrying pulverized coal, to determine the minimum liquid level per day. The high pressure hose is used to dilute the pulverized coal concentration by injecting water into the downhole through the oil sleeve annulus, and the third and fourth stage is mainly to control the casing pressure to meet the gathering and transportation. Through field test and analysis, it is concluded that the production of coalbed gas wells will be increased and the period of pump inspection will be prolonged after adjusting the production system and technological measures, which is of certain guiding significance for the development of coalbed gas wells.
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本文编号：2062692