本文選題：致密油 + 體積壓裂��； 參考：《西安石油大學(xué)》2015年碩士論文

【摘要】：致密油是一種自生自儲(chǔ)、連續(xù)分布聚集的典型非常規(guī)油氣資源,具有儲(chǔ)層致密、滲透率低,儲(chǔ)層基質(zhì)向裂縫供油能力較差的特點(diǎn),靠傳統(tǒng)的水力壓裂很難取得較好的增產(chǎn)效果,必須采用體積壓裂對(duì)儲(chǔ)層進(jìn)行改造,使裂縫不斷擴(kuò)張和脆性巖石產(chǎn)生剪切滑移,形成天然縫與人工主裂縫相互交錯(cuò)的裂縫網(wǎng)絡(luò)以增大儲(chǔ)層改造波及體積。因此研究致密油體積壓裂形成的復(fù)雜縫網(wǎng)是非常必要的,目前尚未有對(duì)體積壓裂形成縫網(wǎng)模態(tài)進(jìn)行系統(tǒng)的討論。本文采用數(shù)值模擬的研究方法,在彈性力學(xué)與斷裂力學(xué)模型基礎(chǔ)上,運(yùn)用邊界元法編寫程序模擬體積壓裂形成的復(fù)雜縫網(wǎng),先對(duì)裂縫延伸、裂縫間互作用進(jìn)行研究,包括水平井單簇以及兩簇壓裂在不同壓力、不同間距、不同角度下的裂縫間互作用,隨后根據(jù)A、B兩個(gè)致密油區(qū)塊的基本數(shù)據(jù),研究在不同地應(yīng)力、不同主裂縫縫內(nèi)壓力、不同天然縫角度下形成的復(fù)雜縫網(wǎng),進(jìn)而探索得出可能的縫網(wǎng)模態(tài)。結(jié)果表明:主裂縫在未與天然縫接觸前就會(huì)誘導(dǎo)天然縫延伸,主裂縫壓力越大越容易誘導(dǎo)天然裂縫破裂形成次生裂縫,且這種誘導(dǎo)作用隨著主裂縫與天然縫間距增大而減小;兩簇壓裂時(shí),主裂縫在延伸過程中其延伸走向會(huì)發(fā)生偏轉(zhuǎn),當(dāng)兩簇壓裂不同步時(shí),先壓開的裂縫會(huì)抑制后壓開裂縫的延伸,且這種抑制作用隨著二者之間距離的增大而減小;對(duì)致密油體積壓裂形成的縫網(wǎng)進(jìn)行模擬,得出可能的兩種縫網(wǎng)模態(tài):水波型、網(wǎng)格型。本研究對(duì)體積壓裂形成裂縫縫網(wǎng)的機(jī)理、評(píng)價(jià)壓后效果具有較重要的意義。
[Abstract]:Compact oil is a typical unconventional oil and gas resource, which is self-generated and self-stored and continuously distributed and accumulated. It has the characteristics of tight reservoir, low permeability, poor oil supply ability to fracture of reservoir matrix, and it is difficult to obtain better effect of increasing production by traditional hydraulic fracturing. The reservoir must be reformed by volume fracturing in order to make the fracture expand continuously and the brittle rock produce shear slip and form a fracture network intertwined between natural fracture and artificial main fracture in order to increase the sweep volume of reservoir reconstruction. Therefore, it is very necessary to study the complex fracture network formed by bulk fracturing of dense oil, and there is no systematic discussion on the fracturing pattern of volume fracturing at present. In this paper, based on the elastic and fracture mechanics models, the numerical simulation method is used to compile a program to simulate the complex fracture network formed by volume fracturing. At first, the fracture extension and the interaction between fractures are studied. It includes single cluster fracturing in horizontal well and the interaction between two fracturing groups under different pressure, different spacing and different angle. Then, according to the basic data of two tight oil blocks, the pressure in different ground stress and main fracture is studied. The complex seams formed at different angles of natural seams, and the possible modes of seams are explored. The results show that the main fracture can induce the extension of the natural crack before contacting with the natural crack, and the higher the pressure of the main crack is, the easier it is to induce the natural fracture to form the secondary fracture, and the effect of this inducement decreases with the increase of the distance between the main crack and the natural crack. When two clusters fracturing, the main fracture will deflect during the extension process. When the two clusters fracturing is out of step, the first fracturing fracture will suppress the extension of the fracture, and the inhibition effect will decrease with the increase of the distance between the two groups. In this paper, the fracture net formed by tight oil volume fracturing is simulated, and two possible fracture network modes are obtained: water wave type and grid type. This study is of great significance to the formation mechanism of fracture network by volume fracturing and the evaluation of post-compression effect.
【學(xué)位授予單位】：西安石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TE357.1

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