【摘要】：混砂壓裂液體系在井筒和裂縫中的運動規(guī)律是建立儲層水力壓裂設(shè)計理論的基礎(chǔ)。由于壓裂液體系自身流變性的多樣性,加之非牛頓流體與固相顆粒兩相體系流動規(guī)律的復(fù)雜性,致使對支撐劑在裂縫中的沉降運移規(guī)律及砂堤分布的認(rèn)識等迄今仍有大量課題亟待攻關(guān)解決。本文以致密儲層改造常用的滑溜水和線性膠壓裂液為對象,實驗研究了溫度、濃度、靜置時間對其流變性的影響,得到了部分致密儲層常用壓裂液的流性指數(shù)和稠度指數(shù),建立了該體系的流變性表征模型;設(shè)計建立了一套專用裝置,實驗研究了支撐劑顆粒在滑溜水和線性膠中的靜態(tài)沉降規(guī)律,并驗證了評價了相關(guān)計算模型;分析了壁面因子、圓球度等因素對支撐劑沉降速度的影響,實驗擬合了修正因子模型,建立了支撐劑沉降末速計算模型;利用相似性準(zhǔn)則設(shè)計了平板裂縫模型,對支撐劑運移規(guī)律進(jìn)行了實驗,研究了不同施工參數(shù)對支撐劑運移速度、砂堤形狀及平衡高度等因素的影響,提出了支撐劑整體運移速度表征方法以及近井地帶填砂程度表征方法,同時對砂堤的形成過程進(jìn)行了觀測研究;建立了相交裂縫模型,對簡單裂縫網(wǎng)絡(luò)中的砂堤展布規(guī)律進(jìn)行了探討,實驗研究了主裂縫和次級裂縫逼近角對砂堤分布規(guī)律的影響。研究成果對致密儲層壓裂改造具有一定的理論借鑒意義和施工參考價值。
[Abstract]:The movement of sand fracturing fluid system in wellbore and fracture is the foundation of reservoir hydraulic fracturing design theory. Due to the diversity of the rheological properties of fracturing fluids and the complexity of the flow law of non-Newtonian fluid and solid particle two-phase system, So far, there are still a lot of problems to be solved, such as the settlement and migration law of proppant in fracture and the distribution of sand dike. In this paper, the effects of temperature, concentration and statics time on rheological properties of slippery water and linear gel fracturing fluid are studied, and the fluidity index and consistency index of commonly used fracturing fluids in some dense reservoirs are obtained. The rheological characterization model of the system was established. A set of special equipment was designed to study the static settlement of proppant particles in slippery water and linear glue, and to verify the evaluation model. The influence of wall factor, sphericity and other factors on the settlement velocity of proppant is analyzed. The modified factor model is fitted and the final velocity calculation model of proppant settlement is established. Based on the similarity criterion, the slab fracture model is designed, and the law of proppant migration is tested. The effects of different construction parameters on the speed of proppant migration, the shape of sand embankment and the height of balance are studied. A method for characterizing the overall migration velocity of proppant and a method for characterizing the sand filling degree in the near well zone are proposed. The formation process of the sand embankment is observed and studied at the same time. The intersecting fracture model is established and the distribution law of sand embankment in simple fracture network is discussed. The influence of the approaching angle of main fracture and secondary fracture on the distribution of sand embankment is studied experimentally. The research results have certain theoretical reference significance and construction reference value for fracturing reconstruction of tight reservoir.
【學(xué)位授予單位】：中國石油大學(xué)(華東)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TE357.12

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