【摘要】：煤儲(chǔ)層壓力是影響煤層氣開發(fā)地質(zhì)條件評價(jià)和鉆完井、增產(chǎn)改造技術(shù)工藝設(shè)計(jì)以及排采制度制定的重要參數(shù),獲得可靠的煤儲(chǔ)層壓力參數(shù)并認(rèn)識(shí)其區(qū)域分布規(guī)律,對于指導(dǎo)煤層氣高效開發(fā)至關(guān)重要。以沁水盆地中南段潞安礦區(qū)山西組3~#煤層為對象,分析發(fā)現(xiàn)前期煤儲(chǔ)層壓力數(shù)值可靠性不足,改進(jìn)并應(yīng)用大時(shí)長關(guān)井注入壓降套管試井方法,完成了潞安礦區(qū)34口煤層氣井的儲(chǔ)層參數(shù)測試和壓力特征的系統(tǒng)研究。結(jié)果表明:(1)大時(shí)長關(guān)井壓降套管試井是潞安低滲透低壓儲(chǔ)層礦區(qū)獲得可靠儲(chǔ)層壓力參數(shù)的先進(jìn)技術(shù)和方法;(2)山西組3~#煤層為低壓和超低壓儲(chǔ)層,在800m埋深以淺,平均儲(chǔ)層壓力梯度為4.2kPa/m,這遠(yuǎn)低于本世紀(jì)初期關(guān)于潞安礦區(qū)儲(chǔ)層壓力(6~7kPa/m)的水平;(3)3~#煤層的低壓特征與煤層埋深和底板高程線性相關(guān),其區(qū)域性分布規(guī)律的控制性地質(zhì)因素是地下水流場和辛安泉域的地面排泄;(4)潞安礦區(qū)3~#煤層的低壓和超低壓儲(chǔ)層的保護(hù)性增產(chǎn)改造技術(shù)工藝亟待開發(fā),這包括壓裂液體系,壓裂泵注程序、壓裂后返排,及時(shí)排采施工,以及排采制度的設(shè)計(jì)和實(shí)施;(5)潞安礦區(qū)山西組3~#煤層低壓—超低壓現(xiàn)象的發(fā)現(xiàn)對重新認(rèn)識(shí)沁水盆地煤儲(chǔ)層壓力規(guī)律具有重要啟發(fā)和借鑒。
[Abstract]:Coal reservoir pressure is an important parameter that affects the evaluation of geological conditions of coalbed methane development and well drilling and completion, the technological design of increasing production and transformation, and the formulation of production discharge system. The reliable pressure parameters of coal reservoir are obtained and the regional distribution law is recognized. It is very important to guide the high efficiency development of CBM. Taking Shanxi 3 # coal seam of Shanxi formation in the middle and south section of Qinshui Basin as an example, it is found that the early stage coal reservoir pressure numerical reliability is not enough, and the long time shut-in injection pressure drop casing test method is improved and applied. The reservoir parameters and pressure characteristics of 34 coalbed gas wells in Lu'an mining area have been studied systematically. The results are as follows: (1) the pressure drop casing test is an advanced technique and method for obtaining reliable reservoir pressure parameters in low permeability low pressure reservoir area of Lu'an; (2) the No. 3 coal seam of Shanxi formation is a low-pressure and ultra-low-pressure reservoir with shallow buried depth at 800m and an average reservoir pressure gradient of 4.2 KPA / m, which is far lower than the level of reservoir pressure (6~7kPa/m) in Lu'an mining area at the beginning of this century; (3) the characteristics of low pressure in No. 3 coal seam are linearly related to the depth of coal seam and the height of floor, and the controlling geological factors of the regional distribution law are groundwater field and surface discharge of Xin-an Spring area; (4) it is urgent to develop the protective stimulation and reconstruction technology of the low pressure and super low pressure reservoir in the No. 3 coal seam of Lu'an mine area, which includes fracturing fluid system, fracturing pump injection procedure, back drainage after fracturing, and timely production operation. And the design and implementation of drainage system; (5) the discovery of low-pressure and ultra-low pressure phenomenon in Shanxi No. 3 coal seam of Shanxi formation in Lu'an mining area has important inspiration and reference for re-understanding the pressure law of coal reservoir in Qinshui Basin.
【作者單位】： 河南理工大學(xué)煤層氣/瓦斯地質(zhì)工程研究中心;瓦斯地質(zhì)與瓦斯治理國家重點(diǎn)實(shí)驗(yàn)室培育基地;中原經(jīng)濟(jì)區(qū)煤層/頁巖氣協(xié)同創(chuàng)新中心;山西潞安礦業(yè)(集團(tuán))有限責(zé)任公司;河南方舟新能源股份有限公司;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(編號(hào):41372159) 山西省科技重大專項(xiàng)資助項(xiàng)目(編號(hào):20111101002)聯(lián)合資助
【分類號(hào)】：TE31;TE37

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