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Risk Assessment of Underbalance Drilling for CBM in the Basin of Qinshui

Author: BoFan
Tutor: ZuoXiangZuo
School: China University of Petroleum
Course: Safety Technology and Engineering
Keywords: Qinshui Basin CBM UBD AHP Fuzzy Evaluation Risk Assessment
CLC: TE28
Type: Master's thesis
Year: 2011
Downloads: 240
Quote: 1
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Abstract


Qinshui Basin CBM underbalanced drilling operations is a complex , high-risk projects , the whole process there is a lot of uncertainty as well as random factors , prone to a variety of accidents, taking into account the size of the facility and underbalanced drilling technology complexity, in the event of an accident , it will cause significant damage to personal property , the paper assessed the risks of drilling has very important practical significance. This article is based on the actual situation in the Qinshui Basin region , the establishment of underbalanced drilling risk assessment model . The first is the region's coal bed methane drilling underbalanced risk factor identification and analysis, which is more critical step , risk factor analysis is underbalanced drilling risk assessment basis and premise . Taking into account the seam for underbalanced drilling wellbore stability problems , this paper established based on software -based FLAC model downhole wellbore stress voltage values ??and the impact of change on wellbore stability . Underbalanced drilling operations for risk assessment , this paper is to construct drilling risk assessment index system hierarchy diagram, using fuzzy mathematics and expertise of various risk factors quantified , using analytic hierarchy process and expert opinion to determine the risk assessment system factor weight distribution , and then through fuzzy comprehensive evaluation model to build comprehensive risk assessment , evaluation results obtained by solving the model . This article also by writing UBD risk assessment software , the entire complex drilling risk assessment process is calculated by the software can be quickly and accurately assess the results , greatly improving the assessment of efficiency. In this paper, the key risk factors on the impact of drilling carried out targeted risk analysis , focusing on analysis of wellbore stability and drilling fluid density and other factors on the impact of underbalanced drilling , by changing their parameters analyzed comprehensive risk assessment of the value of the change . The paper also by writing evaluation software for instance Qinshui Basin region for a successful drilling risk assessment of theoretical models , the actual writing of software engineering combined with the easy task to promote the results .

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CLC: > Industrial Technology > Oil and gas industry > Drilling engineering > Drilling of production safety and the complexity of the situation
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