【摘要】：低滲透油田是今后我國石油工業(yè)相當一個時期增儲上產(chǎn)的主要資源基礎(chǔ),而水力壓裂則是低滲透油田開發(fā)的最主要手段。在閉合壓力的作用下,被送入裂縫的支撐劑會發(fā)生嵌入裂縫壁面的現(xiàn)象。支撐劑嵌入以后,一方面會直接導(dǎo)致裂縫內(nèi)支撐劑充填層孔隙度降低,另一方面也會減小支撐裂縫的寬度,進而致使支撐裂縫導(dǎo)流能力降低,同時還會造成地層破碎產(chǎn)生碎屑,這些碎屑也會堵塞孔隙通道,引起滲透率和導(dǎo)流能力更進一步的降低,從而降低油氣產(chǎn)量。因此,支撐劑嵌入裂縫壁面量化研究對于保障壓裂效果具有重大意義。本文通過對支撐劑在裂縫中的狀態(tài)進行系統(tǒng)的受力分析,在支撐劑嵌入過程中同時考慮支撐劑的變形量對裂縫縫寬的影響,建立支撐劑嵌入深度計算模型、支撐劑壓縮變形量計算模型、裂縫寬度變化計算模型以及填砂裂縫導(dǎo)流能力計算模型。在數(shù)學(xué)模型的基礎(chǔ)上,分析支撐劑粒徑、支撐劑彈性模量、閉合壓力等因素對裂縫寬度和裂縫導(dǎo)流能力的影響規(guī)律。并考慮多排鋪置情況。論文應(yīng)用理論研究與室內(nèi)實驗相結(jié)合的方法,系統(tǒng)地完成了真實巖板情況下多組支撐劑導(dǎo)流對比實驗,并對理論模型進行了驗證。通過對于多組實驗結(jié)果的綜合分析,所得裂縫導(dǎo)流能力的變化趨勢與模型一致。研究結(jié)果表明,在其他條件相同時,支撐劑的粒徑、鋪砂濃度、支撐劑的彈性模量以及儲層的彈性模量,單一因素增大都會引起裂縫導(dǎo)流能力的增大;隨著閉合壓力的增大,裂縫導(dǎo)流能力減小;而支撐劑的泊松比和儲層的泊松比對于裂縫的導(dǎo)流能力影響不大。論文取得的研究成果,可以為壓裂施工現(xiàn)場合理選配支撐劑以及控制支撐劑成本提供理論基礎(chǔ),對優(yōu)化水力壓裂增產(chǎn)倍比,保證壓裂最佳效果具有指導(dǎo)意義。
[Abstract]:Low permeability oil field is the main resource base of increasing reservoir and production in China's petroleum industry in a certain period in the future, and hydraulic fracturing is the most important means of developing low permeability oil field. Under the action of closed pressure, the proppant that is sent into the crack will be embedded in the crack wall. After the proppant is embedded, the porosity of the proppant filling layer in the fracture will decrease, on the other hand, the width of the supporting fracture will be reduced, and the conductivity of the supporting fracture will be reduced, at the same time, the formation will be broken and the debris will be produced. These detritus also clog pore channels, resulting in further decreases in permeability and conductivity, thus reducing oil and gas production. Therefore, it is of great significance to quantify the wall surface of fracture embedded with proppant in order to ensure the fracturing effect. In this paper, the stress of the proppant in the fracture is analyzed systematically, and the influence of the deformation of the proppant on the crack width is taken into account in the process of inserting the proppant, and the calculation model of the depth of the embedded proppant is established. The calculation model of compressive deformation of proppant, the calculation model of crack width change and the calculation model of flow conductivity of sand filling fracture. Based on the mathematical model, the effects of the particle size of proppant, the elastic modulus of proppant and the closing pressure on the crack width and fracture conductivity are analyzed. And consider the situation of multi-row placement. In this paper, the method of combining theoretical research with laboratory experiments is used to systematically complete the comparative experiments of multiple groups of proppant diversion under the condition of real rock slabs, and the theoretical model is verified. Through the comprehensive analysis of the experimental results, the variation trend of the fracture conductivity is consistent with the model. The results show that under the same conditions, the particle size of proppant, the concentration of sand, the elastic modulus of proppant and the elastic modulus of reservoir will increase with the increase of single factor. The permeability of fracture decreases, but the Poisson's ratio of proppant and the Poisson's ratio of reservoir have little effect on the conductivity of fracture. The research results obtained in this paper can provide a theoretical basis for the reasonable selection of proppant and the cost control of proppant in the field of fracturing. It is of guiding significance to optimize the ratio of hydraulic fracturing production to increase production and ensure the best effect of fracturing.
【學(xué)位授予單位】：東北石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TE357.12

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相關(guān)期刊論文 前1條

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本文編號：2143914