本文選題：煤層氣　切入點：深煤層　出處：《西南石油大學(xué)》2015年碩士論文

【摘要】：我國煤層氣資源豐富,隨著淺部勘探的基本完成,1000m以深的煤層氣的勘探開發(fā)已成為必然趨勢,深煤層是非常規(guī)能源的又一發(fā)展方向。然而,相對淺煤層而言,深煤層具有更多的難點,比如具有溫度梯度高、地應(yīng)力高、變質(zhì)程度高和孔隙結(jié)構(gòu)配制差等特點,這就對深煤層的鉆井施工提出了更高的要求。在該類儲層的實際鉆井過程中,儲層保護(hù)的問題幾乎很少被考慮,特別是目前煤層氣的開采單井產(chǎn)量過低以及由此而帶來的綜合成本難以降低已成為制約我國煤層氣發(fā)展的嚴(yán)重障礙。因此,揭示煤層氣儲層損害機理,研究出適合深煤層煤層氣井的低傷害完井液勢在必行。 本文以沁水盆地柿莊北區(qū)塊3號煤和15號煤為研究對象,對3號煤和15號煤的物性特征進(jìn)行對比,并分析了煤巖物性隨煤層埋深的變化規(guī)律。在總結(jié)儲層特征的基礎(chǔ)上,通過敏感性實驗研究了儲層的損害機理,有針對性地確定了深煤層煤層氣井低傷害完井液體系的基礎(chǔ)配方,并通過大量的室內(nèi)實驗,優(yōu)選出了體系中的增黏降失水劑、密度調(diào)節(jié)劑、降濾失劑、黏土穩(wěn)定劑、溫度穩(wěn)定劑、強抑制劑以及其他處理劑,形成了一套低密度、低傷害完井液體系配方,并對其抗溫性、懸浮穩(wěn)定性、密度可調(diào)性、抑制性、緩蝕性以及儲層保護(hù)性能等方面進(jìn)行了評價。 該低傷害完井液體系以XC和CMC-HV作為體系的增黏降失水劑,空心玻璃微珠作為密度調(diào)節(jié)劑,CMC-HV、空心玻璃微珠和CaCO3共同配合降低濾失量,并通過添加強抑制劑、溫度穩(wěn)定劑、黏土穩(wěn)定劑、緩蝕劑等其他處理劑,形成了一套性能良好的完井液體系配方,并很好的解決了低密度完井液體系常見的穩(wěn)定性差和流變性差的難點。通過大量實驗證明,該完井液體系具有良好的熱穩(wěn)定性能,很好的針對了深煤層溫度較高的特點；在0.74-1.03g/cm3的范圍內(nèi)密度任意可調(diào),且性能良好,體系穩(wěn)定性強,很好的針對了煤儲層普遍低壓的特點；對儲層具有很好的保護(hù)效果,完井液對儲層滲透率的損害率僅有10%左右。故該深煤層煤層氣井低傷害完井液技術(shù)的研究不但具有較強的理論意義,而且具有重要的實用價值。
[Abstract]:China is rich in CBM resources. With the basic completion of shallow exploration, the exploration and development of coal-bed methane (CBM) with depth of 1000m has become an inevitable trend, and deep coal seam is another development direction of unconventional energy.However, compared with shallow coal, deep coal has more difficulties, such as high temperature gradient, high ground stress, high degree of metamorphism and poor pore structure, which puts forward higher requirements for drilling construction of deep coal seam.In the actual drilling process of this kind of reservoir, the problem of reservoir protection is rarely considered.Especially, the low production rate of single well and the difficulty of reducing the comprehensive cost have become a serious obstacle to the development of CBM in China.Therefore, it is imperative to reveal the damage mechanism of coalbed methane reservoir and to study the low damage completion fluid suitable for deep coal seam coalbed methane wells.Taking No. 3 coal and No. 15 coal in Shizhuang North Block, Qinshui Basin as the research object, the physical properties of No. 3 coal and No. 15 coal are compared, and the variation law of coal and rock physical properties with coal seam burial depth is analyzed.On the basis of summing up reservoir characteristics, the damage mechanism of reservoir is studied through sensitivity experiments, and the basic formula of low damage completion fluid system in deep coal seam coalbed gas wells is determined, and a large number of laboratory experiments are carried out.A set of low density, low damage completion liquid system formulations were formed by selecting the viscosity and water loss agents, density regulators, filtration reducers, clay stabilizers, temperature stabilizers, strong inhibitors and other treatment agents in the system.Suspension stability, density adjustable, inhibition, corrosion inhibition and reservoir protection were evaluated.The low damage completion liquid system uses XC and CMC-HV as viscosity increasing and reducing water loss agent, hollow glass microsphere as density regulator CMC-HV.The hollow glass microsphere and CaCO3 cooperate to reduce filtration loss, and by adding strong inhibitor and temperature stabilizer,The clay stabilizer, corrosion inhibitor and other treatment agents have formed a set of well completion liquid system formula with good performance, and solved the common difficulties of poor stability and rheological property of low density well completion liquid system.Through a large number of experiments, it is proved that the well completion liquid system has good thermal stability, which is well aimed at the characteristics of high temperature in deep coal seam, and the density can be adjusted arbitrarily in the range of 0.74-1.03g/cm3, with good performance and strong system stability.It is well aimed at the characteristics of low pressure in coal reservoir and has a good protective effect on reservoir. The damage rate of completion fluid to reservoir permeability is only about 10%.Therefore, the study of low damage completion fluid technology in deep coal seam coalbed methane well is not only of great theoretical significance, but also of important practical value.
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TE258

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