【摘要】：體積壓裂技術(shù)是在壓出主裂縫的同時(shí),在主裂縫的周圍壓出次生裂縫,并在次生裂縫上繼續(xù)分支形成二級(jí)次生裂縫,重復(fù)此步驟,不斷的使主裂縫與多級(jí)次生裂縫交織并且使天然縫與人工縫進(jìn)行溝通連接,形成復(fù)雜的裂縫網(wǎng)絡(luò)系統(tǒng)。通過(guò)體積壓裂增加了裂縫面與油藏基質(zhì)的接觸面積,縮短了油氣從基質(zhì)到裂縫的滲流距離,改善了儲(chǔ)層整體滲透能力,提高了儲(chǔ)層內(nèi)油氣的動(dòng)用程度,增加了縱向上可動(dòng)用小儲(chǔ)層的層數(shù),提高了單井產(chǎn)量,從而增加了油藏的可采儲(chǔ)量,體積壓裂技術(shù)最近幾年興起并被廣泛應(yīng)用于非常規(guī)油藏的開(kāi)采中。為了提高致密油藏體積壓裂的壓裂效果,本文建立了考慮啟動(dòng)壓力梯度的有限元數(shù)學(xué)模型,使用三角形單元描述基質(zhì),使用線單元描述裂縫,在自然能量開(kāi)采的條件下,以單井作為研究對(duì)象,對(duì)體積壓裂中裂縫參數(shù)對(duì)水平井開(kāi)發(fā)效果的影響進(jìn)行了研究。借助正交試驗(yàn)設(shè)計(jì)和分析方法,研究分析了不同水平井段長(zhǎng)度(1000m、1300m、1800m)條件下,裂縫半長(zhǎng)、裂縫導(dǎo)流能力及壓裂級(jí)數(shù)對(duì)水平井日產(chǎn)油量、日產(chǎn)水量、日產(chǎn)液量及累計(jì)產(chǎn)油量生產(chǎn)動(dòng)態(tài)參數(shù)的影響規(guī)律,給出了不同水平井段長(zhǎng)度的最優(yōu)方案,為致密油藏體積壓裂技術(shù)的現(xiàn)場(chǎng)應(yīng)用提供了一定的理論指導(dǎo)。
[Abstract]:Volume fracturing technology is to press out the secondary fracture around the main fracture while pressing out the main fracture, and continue to branch on the secondary fracture to form the second secondary fracture, and repeat this step. The main fracture is interlaced with the multi-stage secondary fracture and the natural crack is connected with the artificial crack to form a complex fracture network system. Through volume fracturing, the contact area between fracture surface and reservoir matrix is increased, the seepage distance from matrix to fracture is shortened, the overall permeability of reservoir is improved, and the production degree of oil and gas in reservoir is increased. In recent years, volume fracturing technology has been developed and widely used in the production of unconventional reservoirs by increasing the number of layers of small vertically exploitable reservoirs and increasing the output of single well, thus increasing the recoverable reserves of reservoirs. The technology of volume fracturing has emerged in recent years and has been widely used in the production of unconventional reservoirs. In order to improve the fracturing effect of compact reservoir volume fracturing, a finite element mathematical model considering starting pressure gradient is established in this paper. The triangular element is used to describe the matrix, the linear element is used to describe the fracture, and under the condition of natural energy exploitation, the finite element model is established. Taking single well as the research object, the influence of fracture parameters in volume fracturing on horizontal well development is studied. By means of orthogonal test design and analysis method, the half-length of fracture, the capacity of fracture diversion and the fracturing series of horizontal wells with different horizontal section lengths (1000m, 1300m, 1800m) are studied and analyzed for the daily production and water production of horizontal wells, and the results are as follows: (1 000 m, 1 300 m, 1 800 m). The influence law of dynamic parameters of daily production and cumulative oil production is given, and the optimal scheme of section length for different levels is given, which provides some theoretical guidance for the field application of volume fracturing technology in tight reservoirs.
【學(xué)位授予單位】：東北石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TE357

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