本文選題：易漏井 + 低密度水泥漿��； 參考：《東北石油大學(xué)》2017年碩士論文

【摘要】：低密度水泥漿體系一般指密度小于1.75g/cm3的水泥漿體系,由油井水泥、油井水泥減輕劑、水泥外加劑以及一定量水所構(gòu)成的混合體,低密度水泥漿在易漏井、煤層氣井、長(zhǎng)封井固井施工中的廣泛應(yīng)用。對(duì)于淺層易漏井、煤層氣井固井來說,由于井下溫度低,低密度水泥漿中弱膠凝物質(zhì)較多,導(dǎo)致水泥水化速度慢、強(qiáng)度低;同時(shí),低溫下與低密度水泥漿配套的外加劑較少,嚴(yán)重影響低密度水泥漿應(yīng)用效果。本文圍繞著低密度水泥漿外摻料顆粒級(jí)配及優(yōu)選、低溫下早強(qiáng)技術(shù)及穩(wěn)定性控制、外加劑配伍性三個(gè)核心技術(shù)開展攻關(guān)。優(yōu)選出承壓能力好,性能良好的高強(qiáng)微珠,滿足低密度設(shè)計(jì)要求。優(yōu)選出性能良好的微硅,保證低密度水泥漿具有良好的穩(wěn)定性,同時(shí)防止低密度水泥漿強(qiáng)度衰減。優(yōu)選出性能良好的超細(xì)膠凝材料代替部分油井水泥,提高低密度水泥漿體系綜合性能。利用顆粒級(jí)配技術(shù),確定了水泥漿各組分的理論配比。通過實(shí)驗(yàn)研究,確定了不同密度水泥漿體系各組分實(shí)際配比。針對(duì)低溫低密度水泥漿體系外摻料多,水泥水化速度慢的特點(diǎn),研選出低溫早強(qiáng)劑。利用聚合物包裹、偶聯(lián)化原理,研選出懸浮穩(wěn)定劑。從濾失量和低溫不緩凝角度出發(fā),確定不同類型降失水劑對(duì)低溫低密度水泥漿性能的影響。通過流變性能、沉降穩(wěn)定性、失水量、抗壓強(qiáng)度等多方面的研究,對(duì)低密度水泥漿綜合性能進(jìn)行評(píng)價(jià),并將低密度水泥漿在固井工程中加以實(shí)踐檢驗(yàn)。對(duì)于淺層易漏井、煤層氣井來說,固井是關(guān)鍵環(huán)節(jié)之一,固井質(zhì)量則在很大程度上取決于低密度水泥漿性能。本論文著重于密度為1.30~1.50g/cm3的低溫早強(qiáng)低密度水泥漿體系,該體系具有低溫早期強(qiáng)度高,凝結(jié)時(shí)間短,穩(wěn)定性好等優(yōu)點(diǎn),提高淺層易漏井施工安全及固井質(zhì)量,為淺層易漏井開發(fā)提供有力的技術(shù)支持。
[Abstract]:A low-density cement slurry system generally refers to a cement slurry system with a density less than 1.75g/cm3, a mixture of oil well cement, oil well cement lightener, cement admixture and a certain amount of water. The low density cement slurry is in a leaky well or a coalbed gas well. Widely used in long-sealing well cementing. For shallow reservoir easily leaking wells and coalbed gas wells cementing, due to low downhole temperature and more weak cementing substances in low density cement slurry, the hydration rate of cement is slow and the strength is low. At the same time, at low temperature, there are fewer admixtures matching with low density cement slurry. The application effect of low density cement slurry is seriously affected. This paper focuses on three core technologies: particle gradation and optimal selection of low density cement slurry, early strength technology and stability control at low temperature, and compatibility of admixture. High strength beads with good bearing capacity and good performance are selected to meet the requirements of low density design. The microsilicon with good performance is selected to ensure the stability of low density cement slurry and to prevent the strength attenuation of low density cement slurry. Superfine cementing material with good performance was selected to replace some oil well cement to improve the comprehensive performance of low density cement slurry system. The theoretical ratio of each component of cement slurry was determined by particle gradation technique. Through experimental study, the actual proportion of each component of cement slurry system with different densities was determined. In view of the characteristics of low temperature and low density cement slurry system with many admixtures and slow hydration rate, a low temperature early strength agent was selected. Based on the principle of polymer encapsulation and coupling, the suspension stabilizer was selected. From the point of view of filtration loss and low temperature unretarding, the effects of different water loss reducing agents on the properties of low temperature and low density cement slurry were determined. The comprehensive properties of low density cement slurry are evaluated by studying rheological properties, sedimentation stability, water loss, compressive strength and so on, and the low density cement slurry is tested in cementing engineering. Cementing is one of the key links for shallow porous wells and coalbed gas wells, and the cementing quality depends to a great extent on the performance of low density cement slurry. This paper focuses on the low temperature early strength and low density cement slurry system with density of 1.30~1.50g/cm3. The system has the advantages of high low temperature early strength, short setting time and good stability, so as to improve the safety and cementing quality of shallow porous wells. To provide strong technical support for the development of shallow porous wells.
【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)】：TE256.5

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