發(fā)布時(shí)間：2018-03-17 23:41

  本文選題：煤層氣產(chǎn)能　切入點(diǎn)：主控因素　出處：《中國礦業(yè)大學(xué)》2017年博士論文　論文類型：學(xué)位論文

【摘要】：本文以鄂爾多斯盆地東緣保德區(qū)塊煤儲(chǔ)層地質(zhì)和排采特征為依據(jù),首先從地質(zhì)條件、工程技術(shù)和排采控制三個(gè)方面,系統(tǒng)分析保德區(qū)塊煤層氣產(chǎn)能主控因素,并利用灰色關(guān)聯(lián)分析法對這些產(chǎn)能影響因素進(jìn)行了定量化研究。其次,從儲(chǔ)層壓力變化,井間干擾特征、儲(chǔ)量動(dòng)態(tài)評(píng)價(jià)三個(gè)方面,揭示了煤層氣排采過程中煤儲(chǔ)層的動(dòng)態(tài)變化特征。在此基礎(chǔ)上,從開發(fā)有利區(qū)劃分、井網(wǎng)部署優(yōu)化和排采控制方法三個(gè)方面,系統(tǒng)提出保德區(qū)塊煤層氣產(chǎn)能調(diào)控的技術(shù)方法和措施。取得了以下主要研究成果和認(rèn)識(shí):(1)通過地質(zhì)條件、工程技術(shù)和排采控制三個(gè)方面的系統(tǒng)研究,揭示了保德區(qū)塊煤層氣產(chǎn)能主控因素及其作用機(jī)理,并采用灰色關(guān)聯(lián)分析法對這些產(chǎn)能影響因素進(jìn)行了定量化研究。煤層厚度、地下水流體勢、含氣量、滲透率和臨儲(chǔ)比是影響保德區(qū)塊煤層氣產(chǎn)能的主要地質(zhì)因素;井距大小、總壓裂液量、加砂量是影響產(chǎn)能的主要工程技術(shù)因素;井底壓力下降速度、動(dòng)液面下降速度、套壓直接影響煤層氣產(chǎn)能。采用灰色關(guān)聯(lián)分析法最終得出研究區(qū)煤層氣產(chǎn)能主控因素由強(qiáng)到弱依次為:臨儲(chǔ)比地下水流體勢等效厚度等效含氣量等效加砂量等效壓裂液量等效滲透率平均井距。(2)以典型事例的深刻剖析為基礎(chǔ),構(gòu)建了壓降模型,闡釋了煤層氣排采過程中煤儲(chǔ)層的動(dòng)態(tài)變化特征。揭示了煤層氣排采過程中儲(chǔ)層壓力變化特征及規(guī)律,獲得了單井和多井單相液體穩(wěn)定滲流時(shí)任意一點(diǎn)的壓力表達(dá)式,模擬了單井儲(chǔ)層壓力的變化情況,提出了壓降漏斗影響因素。利用實(shí)際生產(chǎn)中主要采用的兩種井間干擾觀察方法,系統(tǒng)分析了研究區(qū)的井間干擾特征及其對煤層氣產(chǎn)能的影響,并提出了井間干擾的應(yīng)用途徑。計(jì)算出研究區(qū)煤層氣動(dòng)態(tài)儲(chǔ)量,重新估算了靜態(tài)地質(zhì)儲(chǔ)量,并進(jìn)一步分析了儲(chǔ)量動(dòng)用程度和采出程度。(3)通過開發(fā)有利區(qū)劃分、井網(wǎng)部署與優(yōu)化調(diào)整、排采控制方法三個(gè)方面的系統(tǒng)研究,提出了保德區(qū)塊煤層氣產(chǎn)能調(diào)控的具體措施和方法。構(gòu)建了煤層氣開發(fā)有利區(qū)評(píng)價(jià)指標(biāo)體系,將開發(fā)有利區(qū)劃分為4種類型,包括開發(fā)條件有利區(qū)、開發(fā)條件較好區(qū)、開發(fā)條件適中區(qū)、開發(fā)條件較差區(qū)。提出了井網(wǎng)部署與優(yōu)化調(diào)整方案,將井網(wǎng)優(yōu)化劃分為開發(fā)前期井距設(shè)計(jì)、現(xiàn)場井距優(yōu)化、后期井網(wǎng)調(diào)整3個(gè)階段,并提出煤層氣井抽采方式調(diào)整方案。將保德區(qū)塊煤層氣排采過程劃分為排水、產(chǎn)氣前、初始產(chǎn)氣、產(chǎn)氣上升、產(chǎn)氣穩(wěn)定和產(chǎn)氣下降六個(gè)階段,并針對不同排采階段,提出了具體的排采控制措施,并深入分析了不同地質(zhì)條件下典型排采井的控制差異性。
[Abstract]:Based on the geological and drainage characteristics of coal reservoir in Baode block on the eastern edge of Ordos Basin, this paper first systematically analyzes the main factors of coal bed methane productivity control in Baode block from three aspects: geological conditions, engineering technology and drainage control. These factors are quantitatively studied by grey relational analysis. Secondly, from three aspects of reservoir pressure change, interwell interference characteristics, reserves dynamic evaluation, The characteristics of dynamic change of coal reservoir in the process of coal bed methane production are revealed. On the basis of this, from three aspects, the division of favorable areas for development, the optimization of well pattern deployment and the method of drainage control, The technical methods and measures for the control of coalbed methane productivity in Baode block are systematically put forward. The following main research results and understanding are obtained. The main controlling factors and their action mechanism of coalbed methane productivity in Baode block are revealed, and the influence factors of coal seam thickness, groundwater fluid potential and gas content are quantitatively studied by grey correlation analysis. Permeability and reservoir ratio are the main geological factors that affect coalbed methane productivity in Baode block; the size of well spacing, total fracturing fluid quantity and sand addition are the main engineering technical factors affecting productivity; The main controlling factors of coalbed methane productivity in the study area are obtained as follows: equivalent thickness of groundwater fluid potential equivalent gas content equivalent sand content in order of strong to weak. The average well spacing of equivalent permeability of fracturing fluid is based on the deep analysis of typical cases. The pressure drop model is constructed, and the dynamic change characteristics of coal reservoir during coal bed methane production are explained, and the characteristics and rules of reservoir pressure change during the process of coal bed methane discharge and production are revealed. The pressure expressions of any point in single or multi-well single phase liquid steady seepage flow are obtained, and the variation of single well reservoir pressure is simulated. The influence factors of pressure drop funnel are put forward. The characteristics of interwell interference and its influence on coalbed methane productivity are systematically analyzed by using two kinds of observation methods of interwell interference, which are mainly used in practical production. The dynamic reserves of coalbed methane in the study area are calculated, the static geological reserves are reestimated, and the extent of reserve production and recovery is further analyzed. This paper systematically studies three aspects of well pattern arrangement and optimization adjustment and production discharge control method, puts forward the concrete measures and methods of coalbed methane productivity control in Baode block, and constructs the evaluation index system of coal-bed methane development favorable area. The development favorable areas are divided into four types, including favorable development conditions, good development conditions, moderate development conditions and poor development conditions. The well pattern optimization is divided into three stages: well spacing design in the early stage of development, field well spacing optimization, and well pattern adjustment in the later stage, and the adjustment scheme of the extraction and production mode of the coalbed gas well is put forward. The process of coal bed methane production in Baode block is divided into drainage and before gas production. There are six stages of initial gas production, gas production rise, gas production stability and gas production decline. According to different production stages, the specific measures of drainage production control are put forward, and the control differences of typical drainage wells under different geological conditions are analyzed in depth.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2017
【分類號(hào)】：TE37
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本文編號(hào)：1627051