有机盐钻井液时固井液的相容性探索
发布时间：2019-05-09 11:55
【摘要】：有机盐钻井液具有流变性好、抑制性强、造壁性好、保护油气层效果好的优点,对钻具无腐蚀、对环境污染小、相对成本不高,在库车山前钻井中得到大量运用并取得明显成效。 有机盐钻井液的运用,在带来快速优质钻井、保护环境、降低钻井成本的同时,却给固井带来新的挑战。经大量实验验证,有机盐钻井液与现有的水泥浆相容性极差,只要水泥浆与有机盐钻井液直接接触,将发生较严重的污染。本文的研究目的是优选相互适配的隔离液与水泥浆体系；同时,分析水泥浆与钻井液的污染机理,研究降低污染的工艺措施途径,从而提高固井质量。 本文对塔里木克深区块3套水泥浆、隔离液和2套钻井液体系,从流变性、稠化时间、抗压强度、固相悬浮及胶凝程度和失水量多方面进行了相容性测试,并分析了三者接触污染的原因。通过对钻井液外加剂红外光谱扫描分析,分析钻井液外加剂所具有的官能团对水泥水化性能的影响。为进一步分析产生污染的原因,用扫描电子显微镜观察其微观形貌,对污染不同阶段的水泥石结构进行分析。最后通过加入降污染剂解决水泥浆与有机盐钻井液的污染问题。研究结果对保障固井施工安全和提高固井质量具有重要的意义。研究结果如下。 (1)山前构造有机盐钻井液与水泥浆接触污染现象显著,体系B的水泥浆、隔离液与有机盐钻井液的相容性较好； (2)有机盐钻井液中的抗盐抗高温降滤失剂是影响钻井液与水泥浆接触污染的主要因素,需要进一步优化有机盐钻井液中的降滤失剂； (3)降污染剂B的降污染效果最好。
[Abstract]:Organic salt drilling fluid has the advantages of good rheology, strong inhibition, good wall-building and good effect of protecting oil and gas reservoirs. It has no corrosion to drilling tools, less environmental pollution and low relative cost. In front of the Kuqa mountain drilling has been widely used and achieved obvious results. The application of organic salt drilling fluid not only brings fast and high quality drilling, but also brings new challenges to cementing while protecting environment and reducing drilling cost. A large number of experiments show that the compatibility of organic salt drilling fluid with existing cement slurry is very poor. As long as the cement slurry and organic salt drilling fluid are in direct contact, serious pollution will occur. The purpose of this paper is to optimize the suitable isolation liquid and cement slurry system, at the same time, to analyze the pollution mechanism of cement slurry and drilling fluid, and to study the technological measures to reduce the pollution, so as to improve the cementing quality. In this paper, the compatibility of three sets of cement slurry, isolation liquid and two sets of drilling fluid systems in Keshen block of Tarim Basin has been tested from the aspects of Rheology, thickening time, compressive strength, solid suspension and cementitious degree and water loss. The causes of contact pollution among them were also analyzed. The effect of functional groups of drilling fluid admixture on hydration properties of cement was analyzed by infrared spectrum scanning analysis of drilling fluid admixture. In order to further analyze the causes of pollution, the microstructure of cement paste was observed by scanning electron microscope (SEM), and the structure of cement paste in different stages of pollution was analyzed. Finally, the pollution problem of cement slurry and organic salt drilling fluid was solved by adding pollution reducing agent. The research results are of great significance to ensure the safety of cementing operation and improve the cementing quality. The results are as follows. The main results are as follows: (1) the contact pollution phenomenon between organic salt drilling fluid and slurry in Piedmont structure is remarkable, and the compatibility of system B cement slurry and isolation fluid with organic salt drilling fluid is better; (2) the salt-resistant and high-temperature filtration reducer in organic salt drilling fluid is the main factor affecting the contact pollution between drilling fluid and cement slurry, so it is necessary to further optimize the filtrate reducer in organic salt drilling fluid. (3) the pollution reduction effect of B is the best.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE256
[Abstract]:Organic salt drilling fluid has the advantages of good rheology, strong inhibition, good wall-building and good effect of protecting oil and gas reservoirs. It has no corrosion to drilling tools, less environmental pollution and low relative cost. In front of the Kuqa mountain drilling has been widely used and achieved obvious results. The application of organic salt drilling fluid not only brings fast and high quality drilling, but also brings new challenges to cementing while protecting environment and reducing drilling cost. A large number of experiments show that the compatibility of organic salt drilling fluid with existing cement slurry is very poor. As long as the cement slurry and organic salt drilling fluid are in direct contact, serious pollution will occur. The purpose of this paper is to optimize the suitable isolation liquid and cement slurry system, at the same time, to analyze the pollution mechanism of cement slurry and drilling fluid, and to study the technological measures to reduce the pollution, so as to improve the cementing quality. In this paper, the compatibility of three sets of cement slurry, isolation liquid and two sets of drilling fluid systems in Keshen block of Tarim Basin has been tested from the aspects of Rheology, thickening time, compressive strength, solid suspension and cementitious degree and water loss. The causes of contact pollution among them were also analyzed. The effect of functional groups of drilling fluid admixture on hydration properties of cement was analyzed by infrared spectrum scanning analysis of drilling fluid admixture. In order to further analyze the causes of pollution, the microstructure of cement paste was observed by scanning electron microscope (SEM), and the structure of cement paste in different stages of pollution was analyzed. Finally, the pollution problem of cement slurry and organic salt drilling fluid was solved by adding pollution reducing agent. The research results are of great significance to ensure the safety of cementing operation and improve the cementing quality. The results are as follows. The main results are as follows: (1) the contact pollution phenomenon between organic salt drilling fluid and slurry in Piedmont structure is remarkable, and the compatibility of system B cement slurry and isolation fluid with organic salt drilling fluid is better; (2) the salt-resistant and high-temperature filtration reducer in organic salt drilling fluid is the main factor affecting the contact pollution between drilling fluid and cement slurry, so it is necessary to further optimize the filtrate reducer in organic salt drilling fluid. (3) the pollution reduction effect of B is the best.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE256
【参考文献】
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1 谭文礼;王，
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