Study of the efficiency of Casing Drilling Technology & its application

Abstract

The project is explored Casing Drilling Technology and advantages of application this method which is investigated based on researching a number of technical papers published by the Society of Petroleum Engineers (SPE), Halliburton Company, Schlumberger Company, American Association of Drilling Engineers (AADE), as well as some books associated with corresponding drilling operations. The scope of the project is commenced by researching, planning the work and analysing the specific problems associated with conventional drilling technology. It will guide the research to continue with background overview on Casing Drilling Technology, its design considerations and benefits in real world application. It will guide the research to continue with background overview on Casing Drilling Technology, its design considerations and benefits & drawbacks during its operation in industry environment. One of the main advantages of casing drilling technology is a plastering effect which helps to minimise wellbore problems such as wellbore instability, lost circulation, etc. are discussed and demonstrated how these benefits are necessary in mitigating drilling problems. Likewise, the main target is aimed to investigate Casing Drilling technology while an application in South Pars gas field, Persian Gulf that was drilled before with Conventional drilling method. The studies are developed to analyse the design considerations that needs to be taken measurement prior to utilising of the method starts. Additionally, a further investigation is conducted to determine how the buckling, fatigue, hydraulics, torque and drag factors have an impacts on the casing while designing of Casing. This is then followed by specific formulas for calculations of these parameters. South Pars gas field data has been used to perform calculations on the following parameters. Results 4 from these investigations have presented that bending stress due to buckling has an impact on fatigue life of the casing. It has not been revealed the same effect as happens when trajectory is directional, however some other assumptions were realised. Investigations have proved that to solve the problems associated with conventional drilling method Casing Drilling technology can be alternatively suggested. Disadvantages and limitations of this technology are also studied. During drilling operations, Casing Drilling technology has some challenges that should be estimated prior to operate the method in the area. At last, some relevant recommendations are suggested to improve the technology in the future.