本文選題：沁水盆地 + 深煤層　； 參考：《天然氣工業(yè)》2017年10期

【摘要】：為提高深部煤層的煤層氣產(chǎn)能,針對(duì)其地質(zhì)特征提出了在深煤層實(shí)施多口直井同步水力波及壓裂的技術(shù)思路。首先基于邊界元位移不連續(xù)法建立了多裂縫誘導(dǎo)應(yīng)力數(shù)學(xué)模型,模擬深煤層誘導(dǎo)應(yīng)力場(chǎng)分布,分析水力波及壓裂復(fù)雜縫網(wǎng)形成的可能性,然后采用離散元方法研究應(yīng)力干擾的裂縫網(wǎng)絡(luò)延伸情況及其影響因素,最后通過三軸壓裂實(shí)驗(yàn)和現(xiàn)場(chǎng)應(yīng)用效果驗(yàn)證了其可行性。結(jié)果表明:(1)水力波及壓裂技術(shù)能增大應(yīng)力干擾面積和應(yīng)力干擾強(qiáng)度,促使水平主應(yīng)力差的減小甚至誘導(dǎo)局部區(qū)域的地應(yīng)力方向發(fā)生改變,有利于溝通煤巖中發(fā)育的面、端割理,從而形成大規(guī)模高效復(fù)雜的裂縫網(wǎng)絡(luò);(2)水力波及壓裂有利于復(fù)雜縫網(wǎng)形成的條件包括較小的初始水平主應(yīng)力差、低泊松比、較小井距、低壓裂液黏度、高縫內(nèi)凈壓力等;(3)真三軸物理模擬實(shí)驗(yàn)結(jié)果顯示,水力波及壓裂技術(shù)能夠充分溝通煤巖天然裂隙,形成由人工裂縫、面割理和端割理組成的復(fù)雜裂縫網(wǎng)絡(luò)。進(jìn)而提出了一套深煤層多井同步水力波及壓裂工藝優(yōu)化設(shè)計(jì)方法,在沁水盆地南部柿莊北地區(qū)深煤層選取了5口直井進(jìn)行先導(dǎo)性試驗(yàn),裂縫監(jiān)測(cè)及排采數(shù)據(jù)表明,水力波及壓裂井產(chǎn)生的波及體積較大,裂縫網(wǎng)絡(luò)復(fù)雜;較之于常規(guī)壓裂井,水力波及壓裂井不僅見氣更早,產(chǎn)量、套壓較高且穩(wěn)定,而且所形成的區(qū)域壓力降波及鄰井,可大幅增加實(shí)施井及鄰井產(chǎn)量。
[Abstract]:In order to improve the productivity of coal bed methane in deep coal seam, the technical thinking of synchronous hydraulic wave fracturing in multiple straight wells in deep coal seam is put forward according to its geological characteristics. Firstly, based on the boundary element discontinuity method, a mathematical model of induced stress of multiple fractures is established, and the distribution of induced stress field in deep coal seam is simulated, and the possibility of formation of complex fracture network by hydraulic and fracturing is analyzed. Then discrete element method is used to study the fracture network extension of stress interference and its influencing factors. Finally, the feasibility of the method is verified by triaxial fracturing experiment and field application. The results show that hydraulic wave fracturing technology can increase the area of stress interference and the intensity of stress interference, promote the decrease of horizontal principal stress difference and even induce the change of the direction of in-situ stress in local area, which is helpful to communicate the developed surface and end cleavage in coal and rock. Therefore, the conditions conducive to the formation of complex fracture network by hydraulic sweep fracturing include small initial horizontal principal stress difference, low Poisson ratio, small well spacing and low pressure fracturing viscosity. The results of physical simulation experiments show that hydraulic and fracturing techniques can fully communicate the natural fractures of coal and rock and form a complex fracture network composed of artificial fracture, surface cleat and end cleat. Furthermore, a set of optimization design method of synchronous hydraulic wave fracturing technology for deep coal seam is put forward. Five vertical wells are selected in the deep coal seam in the south of Qinshui Basin to carry out pilot tests. The data of fracture monitoring and drainage show that: 1. Compared with the conventional fracturing wells, the hydraulic and fracturing wells not only see gas earlier, produce higher and stable casing pressure, but also form regional pressure drop and spread to adjacent wells, while hydraulic and fracturing wells have larger sweep volume and complex fracture network, which are not only earlier in gas production, but also more stable than those in conventional fracturing wells. Can greatly increase the production of implementation wells and adjacent wells.
【作者單位】： 中聯(lián)煤層氣有限責(zé)任公司;中國海洋石油有限公司;"油氣藏地質(zhì)及開發(fā)工程"國家重點(diǎn)實(shí)驗(yàn)室·西南石油大學(xué);
【基金】：國家科技重大專項(xiàng)“增產(chǎn)改造材料研制及完井工藝研究”(編號(hào):2011ZX05042-002-001)
【分類號(hào)】：TE37

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本文編號(hào)：1786947