【摘要】：近年來我國煤層氣地面開發(fā)工程擴展迅速。煤層氣產(chǎn)業(yè)發(fā)展所面臨的主要的挑戰(zhàn)是單井平均產(chǎn)能低。其原因之一是對排采過程中氣、水流體和儲層物性參數(shù)動態(tài)變化規(guī)律不了解,對參數(shù)變化對產(chǎn)能的影響認(rèn)識不足。本論文以沁水盆地南部潘莊地區(qū)某煤層氣開發(fā)區(qū)塊作為研究對象,通過分析研究區(qū)內(nèi)單井排采過程,對單井和氣田進行儲層模擬、分析和討論,取得如下4個方面的成果。①參數(shù)擬合結(jié)果顯示,注入/壓降法測試的滲透率偏低;單井排采過程中,儲層壓力、水飽和度和剩余含氣量等不斷降低,并以漏斗形式不斷向下、向外擴展;初始儲層壓力大于臨界解吸壓力時,孔隙度和滲透率先減小后增大,而初始儲層壓力接近臨界解吸壓力時,孔隙度和滲透率以增大為主。②建立了研究區(qū)地質(zhì)模型,在全區(qū)內(nèi)布井437口,確定排水速度4.18m3/d,模擬了研究區(qū)煤層氣田孔滲動態(tài)和靜態(tài)條件下的開發(fā)過程。③隨著氣田開發(fā),研究區(qū)流體特征和物性特征動態(tài)變化且平面分異明顯;在孔、滲動態(tài)變化的影響下,氣田總產(chǎn)能增大,影響過程分3個階段;將研究區(qū)劃分為三個地質(zhì)單元,針對不同地質(zhì)單元的地質(zhì)條件和產(chǎn)氣情況,調(diào)整開發(fā)方案,新方案減少建井38口,但總產(chǎn)能增加。④煤層氣田開發(fā)動態(tài)評價方法體系包括地質(zhì)建模、參數(shù)校正和優(yōu)化、氣田開發(fā)動態(tài)評價過程和規(guī)律認(rèn)識,以及氣田開發(fā)效果預(yù)測與評價四個步驟;從不同角度對優(yōu)化排采工作制度提出了建議。
[Abstract]:In recent years, the development project of CBM in China has expanded rapidly. The main challenge to the development of CBM industry is the low average productivity of single well. One of the reasons is that the dynamic change law of gas, water fluid and reservoir physical parameters is not well understood, and the influence of parameter change on productivity is not well understood. In this paper, a coalbed methane development block in Panzhuang area, south of Qinshui Basin, is taken as the research object. Through the analysis of the single well drainage process in the study area, the reservoir simulation, analysis and discussion of single well and gas field are carried out. The results of parameter fitting show that the permeability measured by the injection / pressure drop method is on the low side, and the reservoir pressure, water saturation and residual gas content are decreasing in the process of single well production, and the reservoir pressure, water saturation and residual gas content are decreasing continuously in the form of funnel. When the initial reservoir pressure is greater than the critical desorption pressure, the porosity and permeability decrease first and then increase, while when the initial reservoir pressure approaches the critical desorption pressure, the porosity and permeability increase mainly. In 437 wells distributed in the whole area, the drainage velocity is determined to be 4.18 m3 / d, and the development process under dynamic and static conditions of field porosity and permeability of coalbed gas in the study area is simulated. 3 with the development of gas field, the fluid and physical characteristics of the study area change dynamically and the plane is different obviously. Under the influence of the dynamic change of permeability, the total productivity of the gas field increases and the influence process is divided into three stages, and the research regionalization is divided into three geological units, and according to the geological conditions and gas production conditions of different geological units, the development scheme is adjusted. The new scheme reduces the number of wells built by 38 wells, but the total productivity is increased. 4 the evaluation method system for coalbed methane field development includes geological modeling, parameter correction and optimization, and understanding of the process and law of gas field development dynamic evaluation. Four steps of predicting and evaluating the development effect of gas field are given, and suggestions on optimizing the system of drainage and production are put forward from different points of view.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TE332

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