喷射下导管钻井技术优化研究

发布时间：2018-12-11 10:47

【摘要】：传统导管作业通常采用钻孔、下导管然后固井的方式。而海洋钻井中,由于存在海底浅部地层比较松软,泥线不稳定等问题,传统的下导管作业方式不再适合海上深水作业。目前涌现出的喷射下导管钻井技术能较好的解决传统下导管作业不能解决的问题。本文基于喷射下导管钻井技术在海洋钻井中的应用,对导管入泥深度和钻压排量等喷射下导管的关键参数优化方法进行了研究,主要内容及成果如下： (1)建立了海底浅部地层破裂压力计算模型,根据已知的相关海底土参数可以对海底的最小压力梯度进行计算；建立了喷射下导管最小入泥深度模型和悬挂导管时的入泥深度模型,利用所建立的模型进行了计算并对比分析了喷射下导管的成功现场案例,结果表明：最小入泥深度模型计算出的静置时间能够指导现场作业,确定解脱送入工具CADA解脱的最短时间；利用悬挂导管时的入泥深度模型,得出在静置时间后的入泥深度,考虑实际工况,验证导管下入深度的合理性,并最终确定入泥深度。 (2)分析了钻压和排量的对喷射下导管钻井的影响,建立了钻压优选理论计算模型和钻压计算简化模型,并结合现场数据进行了相关计算,验算结果表明利用简化模型计算出的钻压满足了理论计算；研究了喷射下导管水力喷射钻进机理,确定出了嘴小排量计算方法,进行了排量优化试验,试验得出结论与现场使用排量控制方法基本一致,验证了试验结论的正确性。 (3)根据本文建立的地层破裂压力模型、入泥深度模型和钻压排量模型,编写了喷射下导管钻井参数优化软件。该软件可以为喷射下导管钻井施工提供参考依据,包括海底浅层地层压力梯度的计算,入泥深度和优化钻压、排量等参数的计算,并提供相对应的计算结果曲线。
[Abstract]:The traditional conduit operation usually uses drilling, downducting and cementing. However, in offshore drilling, due to some problems such as relatively soft undersea shallow formation and unstable mud line, the traditional method of down-duct operation is no longer suitable for deep-water operation. At present, the jetting pipe drilling technology can solve the problems that can not be solved by traditional down-pipe operation. Based on the application of jet pipe drilling technology in offshore drilling, this paper studies the optimization methods of the key parameters of jet pipe, such as the mud depth and the displacement of drilling pressure. The main contents and results are as follows: (1) the model of fracture pressure in shallow seabed is established, and the minimum pressure gradient can be calculated according to the known parameters of seabed soil; The model of the minimum penetration depth of the jet tube and the model of the penetration depth of the suspension pipe are established. The successful cases of the jet tube are compared and analyzed by using the established model. The results show that the static time calculated by the minimum mud depth model can guide the field operation and determine the shortest time for the release into the tool CADA. By using the model of the inlet depth when the pipe is suspended, the depth of the inlet after the static time is obtained, considering the actual working conditions, the rationality of the inlet depth of the pipe is verified, and the depth of the inlet is finally determined. (2) the influence of drilling pressure and displacement on jet pipe drilling is analyzed, the theoretical calculation model of drilling pressure optimization and the simplified model of drilling pressure calculation are established, and the relevant calculation is carried out in combination with field data. The results show that the drilling pressure calculated by the simplified model satisfies the theoretical calculation. The mechanism of hydraulic jet drilling under jet pipe is studied, the calculation method of small displacement of nozzle is determined, and the optimization test of displacement is carried out. The conclusion of the experiment is basically consistent with the control method of displacement used in the field, and the correctness of the test conclusion is verified. (3) according to the formation fracture pressure model, the mud depth model and the drilling pressure displacement model, the optimization software of drilling parameters is developed. The software can be used as a reference for jet drilling, including the calculation of pressure gradient in shallow seabed formation, the calculation of mud penetration depth and optimized drilling pressure, displacement and so on, and the corresponding result curves are provided.
【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】：TE242.9

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