吉林油田臨參1井防漏堵漏技術(shù)研究
[Abstract]:Well leakage is one of the most serious and complex situations that affect the safety of drilling operation. The occurrence of well leakage will not only bring losses to drilling engineering, but also cause well collapse, blowout, sticking and other accidents, and even lead to the scrapping of some wells or the whole section, which will bring great difficulties to the exploration and development of oil and gas resources. Linshen 1 well is the first regional exploration well in Yalu River Basin. Since the drilling began in October 2012, many leakage have occurred, resulting in serious economic losses. Through the analysis of field data and formation conditions, it is concluded that the malignant leakage of the upper strata caused by the development of pores and fissures in basalt is caused by the development of pores and microcracks, and the small leakage to middle leakage of the strata of the lower Qianggou formation is caused by the development of pores and microfractures. The method of bridge plugging and cement slurry leakage is adopted to solve the leakage of the upper formation, and the bridge blocking method is used to solve the leakage of the lower formation. The drilling fluid implementation scheme and plugging measures in the whole well section are worked out, and the field construction is guided. The leakage model of drilling fluid under natural fracture condition is established, and it is concluded that the Rheological parameters are an important factor affecting the leakage of drilling fluid in fracture formation. The stronger the shear dilution effect is, the higher the leakage rate of drilling fluid is. Especially in the initial stage of leakage, the final leakage is controlled by the dynamic shear force of drilling fluid. From the results of studying the effect of drilling fluid on leakage, the use of plugging material is not the only way to reduce leakage. For reservoirs with fractures, plugging materials will cause permanent damage to reservoirs. The Rheological adjustment of drilling fluid and the use of plugging materials can be considered to reduce the leakage of drilling fluid. By using the model and quantitative analysis of the field data, the estimation of crack width can be obtained. The width of cracks is very meaningful for the formulation of plugging measures. The crack width can be well estimated by using this model.
【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】:2015
【分類號(hào)】:TE28
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