發(fā)布時間：2018-05-14 07:28

  本文選題：火燒油層技術(shù) + 稠油油藏��； 參考：《西南石油大學(xué)》2017年碩士論文

【摘要】：采用火燒油層技術(shù)開采稠油油藏過程中,固井水泥環(huán)需要長期在高溫和CO2腐蝕環(huán)境下服役,由此造成的水泥環(huán)層間封隔失效、套損等難題已成為影響稠油熱采井效益的主要原因之一。因此,為提高固井水泥石的耐久性和完整性,確保固井質(zhì)量及油井安全壽命,論文研究了火燒油層工況下固井水泥材料及其耐高溫耐腐蝕性能。本文從材料科學(xué)角度出發(fā),綜合考慮稠油熱采井火燒油層工況,通過力學(xué)性能測試、滲透率和孔隙度測試、物相組成分析、微觀形貌觀察,考察了加砂油井水泥石的耐高溫性能及失效演化規(guī)律;通過測試粒度分布、化學(xué)組成、礦物組成等水泥物化參數(shù),結(jié)合高低溫條件下水泥石的強(qiáng)度發(fā)展,考察了三種型號鋁酸鹽水泥基材的性能;通過測試水泥漿基本性能、稠化時間、早期強(qiáng)度、長期強(qiáng)度,優(yōu)選與鋁酸鹽水泥伍配性好的外摻料和外加劑,對鋁酸鹽水泥漿體系進(jìn)行改性研究;通過力學(xué)性能測試、滲透率和孔隙度測試、物相組成分析、微觀形貌觀察,初步探索了改性鋁酸鹽水泥石的性能變化規(guī)律及耐高溫、耐CO2腐蝕機(jī)理。結(jié)果表明:火燒油層工況下高溫環(huán)境導(dǎo)致的物相和微觀形貌變化是加砂油井水泥石劣化失效的本質(zhì)原因。高溫300℃時,水化產(chǎn)物C-S-H凝膠和Ca(OH)2輕微脫水分解,加砂水泥石強(qiáng)度衰退、滲透率增加,水泥石處在劣化失效的臨界點(diǎn)。高溫400℃時,加砂水泥石輕微開裂膨脹,水化產(chǎn)物大量脫水分解,水泥石劣化失效加劇,已經(jīng)不能滿足對固井水泥石完整性的要求。另一方面,改性鋁酸鹽水泥漿基本性能良好,稠化時間可控、可調(diào)。硬化水泥石的早期強(qiáng)度較高,長期強(qiáng)度穩(wěn)定發(fā)展,滲透率和孔隙度較低,其耐高溫性能明顯優(yōu)于加砂油井水泥石。低溫50℃環(huán)境下,摻入礦渣使得鋁酸鹽水泥石生成六方板狀水化產(chǎn)物C2ASH8,彌補(bǔ)了晶型轉(zhuǎn)變造成的微裂紋和孔隙,改善了鋁酸鹽水泥石強(qiáng)度發(fā)展的溫度敏感性。高溫500℃時,改性鋁酸鹽水泥石內(nèi)部重結(jié)晶反應(yīng)生成C12A7,有助于水泥石抗壓強(qiáng)度保持穩(wěn)定,水泥石表現(xiàn)出極強(qiáng)的彈性變形能力。此外,改性鋁酸鹽水泥石展現(xiàn)出較強(qiáng)的抗CO2腐蝕能力。低溫水溶性CO2腐蝕環(huán)境下,腐蝕時間由7d延長至28d,改性水泥石的抗壓強(qiáng)度不降反增,腐蝕層中只發(fā)現(xiàn)少量腐蝕產(chǎn)物CaCO3和CaAl2(CO3)2(OH)4·3H2O。而高溫氣態(tài)CO2環(huán)境對改性水泥石的腐蝕作用微乎其微,可忽略不計,試樣腐蝕內(nèi)外層未發(fā)現(xiàn)具有腐蝕性特征的微觀區(qū)域及碳化產(chǎn)物。使用改性鋁酸鹽水泥漿體系進(jìn)行了 2口井的現(xiàn)場試驗,其中,D-1井和J-1井固井質(zhì)量都較好,具有較好的應(yīng)用前景。
[Abstract]:In the process of exploiting heavy oil reservoir with burning oil layer technology, cementing cement ring needs to be in service under high temperature and CO2 corrosion environment for a long time, which results in the failure of sealing between cement rings. Casing loss and other difficult problems have become one of the main reasons that affect the efficiency of heavy oil thermal recovery wells. Therefore, in order to improve the durability and integrity of cemented cement stone and ensure the cementing quality and safety life of oil well, the cementing cement material and its high temperature and corrosion resistance under the condition of burning oil layer are studied in this paper. In this paper, from the point of view of material science, the working conditions of heavy oil thermal recovery well fire are considered synthetically. Through the testing of mechanical properties, permeability and porosity, phase composition analysis and microscopic morphology observation, The properties of high temperature resistance and failure evolution of cemented stone in sanding well were investigated, and the strength development of cement stone under high and low temperature was studied by testing the physical and chemical parameters of cement such as particle size distribution, chemical composition, mineral composition, etc. The properties of three kinds of aluminate cement substrates were investigated, and the basic properties of cement slurry, thickening time, early strength, long-term strength, excellent selection of admixtures and admixtures with good compatibility with aluminate cement were tested. The modification of aluminate cement paste system was studied, and the performance change and high temperature resistance of modified aluminate cement paste were preliminarily explored by means of mechanical property test, permeability and porosity test, phase composition analysis and microscopic morphology observation. CO2 corrosion resistance mechanism. The results show that the change of phase and micromorphology caused by high temperature environment is the essential reason for the deterioration and failure of cemented stone in sanded oil wells. At high temperature of 300 鈩，

本文編號：1886938