本文選題：低密度水泥石 + 力學性能��； 參考：《西南石油大學》2016年碩士論文

【摘要】：漂珠低密度水泥漿體系在低壓、易漏地層的安全固井中發(fā)揮著重要作用,在我國西部高溫深井和儲氣庫井的固井中應(yīng)用廣泛。低密度水泥漿在井下凝固成水泥環(huán)后的封固能力直接關(guān)系到油氣井的安全和生產(chǎn)壽命。目前國內(nèi)對于漂珠低密度水泥漿體系的研究以滿足工程應(yīng)用為主,對水泥石長期力學性能的研究存在不足。因此,本文通過模擬現(xiàn)場工況對漂珠低密度水泥漿體系的力學性能進行深入的測試與分析,針對水泥石力學性能存在的不足,優(yōu)選纖維材料進行力學改性,保障低密度水泥環(huán)在井下的長期封固能力。本文在對國內(nèi)外研究現(xiàn)狀進行充分調(diào)研的基礎(chǔ)上,模擬現(xiàn)場工況對漂珠低密度水泥漿體系進行了全面、詳細、深入的力學實驗評價。測試了不同齡期、不同溫度環(huán)境下水泥石的抗壓強度、抗拉強度、單軸和三軸下水泥石的力學性能、循環(huán)載荷下水泥石的力學性能；對水泥石的孔徑大小分布、微觀形貌、孔隙度和滲透率大小進行了測試分析,從微觀結(jié)構(gòu)的角度分析了水泥石的宏觀力學現(xiàn)象；通過水泥環(huán)力學模型、完整性實驗和損傷理論等方法分析水泥環(huán)的失效機理；通過優(yōu)選纖維材料來改善漂珠低密度水泥石的力學性能。本文在實驗研究和理論研究的基礎(chǔ)上,形成了如下結(jié)論：(1)漂珠低密度水泥石具有較好的抗壓強度,而抗拉強度降低,抗拉與抗壓強度之比較��；(2)通過循環(huán)加載實驗發(fā)現(xiàn),水泥石在第一周的循環(huán)加載中發(fā)生了較大的壓實形變,在第二至第五周的加載中水泥石具有較好的彈性形變能力,在第六和第七周的加載中水泥石的塑性形變大幅增加,說明水泥石在多周加載之后內(nèi)部結(jié)構(gòu)產(chǎn)生破壞,喪失彈性形變的能力；(3)通過水泥環(huán)力學模型進行了計算,在高內(nèi)壓狀態(tài)下水泥環(huán)主要表現(xiàn)為拉伸失效,水泥環(huán)上部和中部封固段的封固能力較好,下部封固段的封固能力不足,有待于提高；(4)通過完整性實驗裝置進行實驗發(fā)現(xiàn),漂珠低密度水泥環(huán)在高溫養(yǎng)護環(huán)境下易發(fā)生本體開裂現(xiàn)象,而水泥漿體系在水化過程中產(chǎn)生的堿骨料反應(yīng)是導致水泥環(huán)開裂的重要原因；(5)優(yōu)選出FK纖維可以有效的提高低密度水泥石的抗拉強度和形變恢復能力,有效改善漂珠低密度水泥環(huán)在高溫養(yǎng)護下的開裂現(xiàn)象；(6)摻入FK纖維后漂珠低密度水泥漿的流動性、API失水、稠化時間、沉降穩(wěn)定性滿足現(xiàn)場施工的要求。
[Abstract]:Bleach low density cement slurry system plays an important role in the safe cementing of low pressure and easy leakage formation and is widely used in high temperature deep wells and gas storage wells in western China. The sealing ability of low density cement slurry is directly related to the safety and production life of oil and gas wells. At present, the research on the low density cement slurry system is mainly to meet the engineering application, but the study on the long-term mechanical properties of cement stone is insufficient. Therefore, in this paper, the mechanical properties of the low density cement slurry system are tested and analyzed by simulating the field working conditions, aiming at the shortcomings of the mechanical properties of cement stone, the mechanical modification of the fiber material is selected. The long-term sealing ability of low density cement ring is guaranteed. Based on the investigation of the present research situation at home and abroad, this paper makes a comprehensive, detailed and in-depth mechanical experimental evaluation of the low density cement slurry system with drifted beads under simulated field conditions. The compressive strength, tensile strength, mechanical properties of uniaxial and triaxial sewers and the mechanical properties of cement stones under cyclic loading were tested under different ages and temperatures. The porosity and permeability are tested and analyzed, the macroscopic mechanical phenomena of cement stone are analyzed from the point of view of microstructure, the failure mechanism of cement ring is analyzed by means of cement ring mechanics model, integrity test and damage theory, etc. The mechanical properties of bleach low density cement stone were improved by optimizing the fiber material. Based on the experimental and theoretical studies, the following conclusions have been obtained in this paper: (1) the low density bleach cement stone has better compressive strength, while the tensile strength is lower, and the ratio of tensile strength to compressive strength is small. In the first week of cyclic loading, the cement stone has a large compaction deformation. During the second to fifth weeks of loading, the cement stone has a better elastic deformation ability, and the plastic deformation of the cement stone increases significantly during the sixth and seventh weeks of loading. It shows that the internal structure of cement stone is destroyed after multi-cycle loading, and the ability to lose elastic deformation is calculated by the mechanical model of cement ring. Under high internal pressure, the cement ring is mainly characterized by tensile failure. The sealing ability of the upper and middle parts of the cement ring is better than that of the lower part, which needs to be improved. Under the high temperature curing environment, the floating bead low density cement ring is prone to cracking. The alkali aggregate reaction in the hydration of cement slurry system is an important cause of cement ring cracking. FK fiber can effectively improve the tensile strength and deformation recovery ability of low density cement stone. It is effective to improve the cracking phenomenon of bleach low density cement ring under high temperature curing. After adding FK fiber, the flowing water loss, thickening time and settling stability of floating bead low density cement slurry can meet the requirements of site construction.
【學位授予單位】：西南石油大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TE256

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