發(fā)布時間：2018-05-15 02:06

  本文選題：固井 + 膠結強度�。� 參考：《西南石油大學》2015年博士論文

【摘要】：固井界面膠結強度與水泥環(huán)層間封隔能力密切相關,而層間封隔能力則是一個關系到安全生產、資源開發(fā)效率、經濟效益和生態(tài)環(huán)境保護的綜合問題。研究提高或改善界面膠結質量是一項系統工程,需要研究鉆井、完井施工作業(yè)中不同工作液的性能以及相互作用時工作液的性能,不是研究某種單一的工作液就可以提高界面膠結質量。本文將鉆井液、前置液、水泥漿三種工作液作為整體、以縱向體系的方式研究影響界面膠結質量的因素。使用離子型共聚單體AMPS和NaSS制備出用于油井水泥的ASL無皂膠乳。ASL無皂膠乳具有良好的乳液穩(wěn)定性、成膜性和熱穩(wěn)定性。使用紅外光譜和透射電鏡研究方法分析了ASL無皂膠乳的化學組分和微觀形貌。與THD-818市售膠乳以及NSL傳統膠乳相比,ASL無皂膠乳在未加穩(wěn)定劑時就具有良好的離子穩(wěn)定性。研究發(fā)現AMPS/NaSS的用量在1.3%-1.9%時,ASL無皂膠乳水泥的抗壓強度和膠結強度較高。在ASL膠乳水泥漿中加入適量的消泡劑有利于提高膠乳水泥漿的密度和水泥石的抗壓強度,D50消泡劑適宜的用量為0.8%；ASL-13膠乳加量為10%-20%時,膠乳水泥漿具有良好的性能,水泥石具有較高的抗壓強度和膠結強度；ASL膠乳水泥漿在70℃C和90℃C時有良好的稠化曲線；隨著養(yǎng)護溫度(70-C～90℃C)的增高或養(yǎng)護時間(1天～15天)的增長,ASL膠乳水泥石的抗壓強度和膠結強度均有所增加。使用X衍射分析和綜合熱分析發(fā)現ASL-13膠乳水泥和空白水泥在水泥本體和界面膠結處的水化產物差別很大。在水泥本體中,ASL-13膠乳水泥含有膠乳和較多的碳酸鈣,而空白水泥樣品中含有較多的氫氧化鈣；在膠結界面處,ASL-13膠乳在界面處抑制了氫氧化鈣晶體的生長、增加了碳酸鈣或鈣礬石(AFt)含量、促進了凝膠類水化產物的生長,這些水化產物有利于提高界面膠結強度。使用掃描電鏡分析觀察到ASL-13膠乳水泥樣品和THD-815膠乳水泥樣品中都有膜類物質,而且ASL膠乳水泥石的表面粗糙度顯著降低。ASL無皂膠乳在油井水泥中的作用機理可以分為兩個方面：一是在水泥漿中,傳統膠乳依靠乳化劑與水泥顆粒之間的范德華力吸附在水泥顆粒表面。而ASL無皂膠乳是由膠乳粒子表面的離子基團與水泥顆粒形成離子鍵,同時膠乳粒子以離子鍵的形式吸附在晶體表面而形成空間位阻,改變了晶體的生長規(guī)則,破壞了晶體的正常增長,使得結晶類水化產物的體積減小；二是在水泥石中,在ASL膠乳膜和水泥界面之間是以離子鍵的形式黏合的,而傳統膠乳水泥中,膠乳膜和水泥界面之間是由乳化劑等物質填充的,因此無皂膠乳水泥表現出較高的抗壓強度和膠結強度。研究對多種鉆井液具有良好沖洗能力的雙相前置液體系,前置液在室溫及高溫稠化后具有良好熱穩(wěn)定性、流變性和懸浮穩(wěn)定性。前置液與鉆井液和水泥漿均有良好的相容性和穩(wěn)定性。前置液與ASL膠乳水泥漿混合后,對水泥漿的稠化曲線無不良影響。同時使用雙相前置液和ASL膠乳水泥時,界面膠結強度最高。雙相前置液中的微硅、礦渣等活性材料參與界面處的水泥水化反應,消耗了界面處的氫氧化鈣,具有膨脹性的結晶類產物增多；同時使用雙相前置液和ASL膠乳水泥時,膠結界面處形成大量結晶類和凝膠類物質,提高了膠結質量。這些實驗結果說明ASL無皂膠乳水泥性能良好,與雙相前置液配合使用時,可以顯著地提高界面膠結強度,有利于提高水泥環(huán)的層間封隔能力,提高固井質量。
[Abstract]:Cementing strength is closely related to the interlayer sealing ability of cement ring, and interlayer sealing ability is a comprehensive problem related to safety production, resource development efficiency, economic benefit and ecological environment protection. It is a systematic process to study and improve the interface cementation quality. It is necessary to study drilling and different completion construction operations. The performance of the working fluid and the performance of the working fluid at the time of interaction are not to study a single working fluid to improve the bonding quality of the interface. In this paper, three working fluids of drilling fluid, preliquid and cement slurry are used as a whole to study the factors affecting the interfacial cementation in a vertical system. The use of ionic copolymerized monomers AMPS and NaSS ASL soap free latex.ASL emulsifier free latex used for oil well cement has good emulsion stability, film formation and thermal stability. The chemical composition and Micromorphology of ASL soap free latex are analyzed by infrared and transmission electron microscopy. Compared with THD-818 market latex and NSL traditional latex, ASL soap free latex is not added to stabilizer When the dosage of AMPS/NaSS is 1.3%-1.9%, the compressive strength and cementation strength of ASL soap free latex cement is higher. Adding a proper amount of defoamer to ASL latex cement slurry is beneficial to improving the density of latex cement slurry and the compressive strength of cement stone. The suitable dosage of D50 defoamer is 0.8%; ASL-13 When the latex was added to 10%-20%, the latex cement slurry had good performance. The cement stone had high compressive strength and cementation strength; ASL latex cement slurry had a good thickening curve at 70 C C and 90 C C; with the increase of curing temperature (70-C ~ 90 C C) or curing time (1 days to 15 days), the compressive strength of ASL latex cement stone X diffraction analysis and comprehensive thermal analysis show that the hydration products of ASL-13 latex cement and blank cement are very different in the cement body and the interface cementation. In the cement body, ASL-13 latex cement contains latex and more calcium carbonate, and there are more calcium hydroxide in the blank water mud sample. At the boundary surface, ASL-13 latex inhibits the growth of calcium hydroxide crystal at the interface, increases the content of calcium carbonate or ettringite (AFt), and promotes the growth of the hydrogel type hydration products. These hydrated products are beneficial to improve the bonding strength of the interface. The samples of ASL-13 latex cement and the samples of THD-815 latex cement are observed by scanning electron microscopy. There are membrane materials and the surface roughness of ASL latex cement can be significantly reduced. The mechanism of.ASL soap free latex in oil well cement can be divided into two aspects: one is in cement slurry, the traditional latex depends on the van Edward force between emulsifier and cement particles on the surface of cement particles. And ASL soap free latex is a latex particle table. The ionic group formed the ionic bond with the cement particles, and the latex particles adsorbed on the crystal surface to form the space hindrance, which changed the growth rule of the crystal, destroyed the normal growth of the crystal and reduced the volume of the crystallization products, and two in the cement stone, between the ASL latex film and the cement interface. In the form of ionic bond, and in traditional latex cement, the latex film and the cement interface are filled with emulsifier and other substances. So the soap free latex cement shows high compressive strength and cementation strength. The study of the biphasic pre fluid system with good flushing ability for various drilling fluids, the preliquid is thickened at room temperature and high temperature. It has good thermal stability, rheology and suspension stability. The preliquid has good compatibility and stability with the drilling fluid and cement slurry. The mixture of preliquid and ASL latex cement has no adverse effect on the thickening curve of the cement slurry. At the same time, the interface cementation strength is the highest when the biphase preliquid and the ASL latex cement are used. The microsilicon, slag and other active materials participate in the hydration reaction of cement at the interface, which consumes the calcium hydroxide at the interface and increases the expansion of the crystalline products. At the same time, a large number of crystals and gelatinous substances are formed at the cementation interface when the biphase preliquid and ASL latex cement are used, and the cementation quality is improved. These experimental results show that ASL The soapless latex cement has good performance and can improve the bonding strength of the interface remarkably when it is used with the biphasic preposition solution, which is helpful to improve the interlayer sealing ability of the cement ring and improve the cementing quality.

【學位授予單位】：西南石油大學
【學位級別】：博士
【學位授予年份】：2015
【分類號】：TE256

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