本文關(guān)鍵詞：沁南煤層氣井排采儲層傷害的耦合機理　出處：《安徽理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 沁水南部 煤層氣 有效應(yīng)力 氣鎖 應(yīng)力敏感

【摘要】：為了提高對沁水區(qū)塊煤層氣排采傷害的認(rèn)識,改進排采控制技術(shù),節(jié)約生產(chǎn)和管理成本,本論文以沁南煤層氣田為研究實例,通過系統(tǒng)收集煤層氣井工程數(shù)據(jù)和排采數(shù)據(jù),采集煤層氣井產(chǎn)出地層水樣和煤巖樣,闡明高、中、低產(chǎn)井排采傷害生產(chǎn)表現(xiàn)特征,并同時通過煤儲層速敏、賈敏、應(yīng)力敏感性模擬實驗揭示不同排采強度下煤層氣井排采儲層傷害的發(fā)生條件和傷害程度,耦合分析在不同排采階段煤層氣井不同排采傷害的生產(chǎn)特征,揭示速敏、賈敏、應(yīng)力敏感與煤層氣井排采強度之間的內(nèi)在聯(lián)系,提出煤層氣井排采優(yōu)化工藝。本次研究取得的主要結(jié)論如下： (1)建立了煤層氣井排采傷害判別模式：沁南煤層氣井前期容易發(fā)生速敏效應(yīng),中期為賈敏效應(yīng)(氣鎖)高發(fā)期,后期會發(fā)生應(yīng)力敏感效應(yīng)。且排采過程中,三類產(chǎn)能井中最易發(fā)生的儲層傷害為賈敏(氣鎖),隨后為速敏效應(yīng),最后為應(yīng)力敏感。 (2)通過速敏實驗得到排水速率超過8m3/d時,速敏效應(yīng)發(fā)生的可能能大大增加。8m3/d的排采速率可以作為一個安全排采界線。同時得到速敏實驗時滲透率的四種變化模式：①緩慢下降后在某一點急劇下降；②迅速下降然后在一轉(zhuǎn)折點處開始平穩(wěn)下降；③滲透率經(jīng)過一段時間的慢慢變小,后有緩慢上升,最后又緩慢下降；④滲透率呈直線式下降。 (3)證明了排采速率過大容易造成氣水相對滲透率的降低,且當(dāng)排采速率超過8m3/d時,排采速率越大,造成的損失相對滲透率越大。 (4)應(yīng)力敏感性實驗結(jié)果表明：①煤樣的在有效應(yīng)力較低的時候,孔隙壓力的不斷增加(最高至3.5Mpa),煤儲層的滲透率的到改善,且當(dāng)原始滲透率越大,得到的改善結(jié)果更明顯；②滲透率損耗在有效應(yīng)力為3.5Mpa前比較大,在有效應(yīng)力為2.5Mpa或者3.5Mpa之后,滲透率的損耗最高,且有效應(yīng)力從2.5Mpa增加到9Mpa時,應(yīng)力敏感性最強；③證明了在孔隙壓力低于滲透率變化的臨界壓力時(實驗過程中孔隙壓力是從0.8Mpa增加至3.5Mpa),煤儲層的滲透率隨孔隙壓力的增加而變小。 模型模擬分析的結(jié)果表明低產(chǎn)井后期壓敏和速敏效應(yīng)耦合發(fā)生概率較大。
[Abstract]:In order to improve the understanding of coal bed methane (CBM) recovery damage in Qinshui block, improve the drainage control technology, and save production and management costs, this paper takes Qinnan coalbed methane field as an example. By collecting the engineering data of coalbed methane wells and discharging data systematically, collecting the formation water samples and coal rock samples produced by coalbed gas wells, the characteristics of production performance of high, middle and low production wells are expounded, and the speed sensitivity of coal reservoirs is also analyzed. Jia Min, stress sensitivity simulation experiment to reveal the occurrence conditions and damage degree of coalbed methane well drainage reservoir damage under different production intensity, coupled analysis of different production characteristics of coal-bed methane well at different production stage. The relationship between stress sensitivity and recovery strength of coalbed methane wells is revealed, and the optimization technology of coal bed methane well drainage is put forward. The main conclusions of this study are as follows: 1) the model for judging the recovery damage of coalbed methane wells is established: the early stage of Qinnan coalbed methane well is prone to the rate sensitive effect, and the middle stage is the high occurrence period of the Jamin effect (gas lock). The stress sensitivity effect will occur in the later stage, and the reservoir damage in the three types of productivity wells is Jia Min (gas lock, then speed sensitivity, and finally stress sensitivity). 2) the drainage rate is more than 8m3 / d by the speed sensitivity test. It is possible that the speed sensitivity effect can increase the production rate of 8 m3 / d greatly. It can be used as a safe discharge boundary. At the same time, four models of permeability change in the speed sensitivity experiment are obtained:. (1) after a slow decline, a sharp decrease at a certain point; (2) decrease rapidly and then begin to drop steadily at a turning point; (3) the permeability decreases slowly after a period of time, then increases slowly, then decreases slowly; (4) the permeability decreases in a straight line. It is proved that the gas / water relative permeability decreases easily when the production rate is too large, and the loss of relative permeability is greater when the production rate exceeds 8 m3 / d. The results of stress sensitivity experiments show that the pore pressure of the sample of 1 / 1 increases continuously when the effective stress is low (up to 3.5 Mpas, the permeability of coal reservoir is improved. And when the original permeability is larger, the improved results are more obvious. (2) permeability loss is larger before effective stress is 3.5Mpa, and when effective stress is 2.5Mpa or 3.5Mpa, permeability loss is the highest. When the effective stress is increased from 2.5 MPA to 9 MPA, the stress sensitivity is the highest. It is proved that when the pore pressure is lower than the critical pressure of permeability change (the pore pressure is increased from 0.8 MPA to 3.5 Mpa during the experiment). The permeability of coal reservoir decreases with the increase of pore pressure. The results of model simulation show that the coupling probability of pressure sensitivity and velocity sensitivity in the later stage of low production wells is high.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TE358

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