Safety Assessment Of Oil And Gas Drilling Engineering Based On Structural Equation Model

Oil and gas drilling is a major engineering of oil and natural gas exploration and development, and is the only means of oil and gas exploration that is confirmed. Since the beginning of the 20th century, with the drilling technology becoming mature, the world's oil and gas exploration and development activities have become increasingly active, and the exploration areas are ranging from land to sea, from shallow to deep, and from old to new. However, oil and gas drilling is a system engineering with multi-project, multi-working procedure, interchange and continuous operation. Due to factors such as nature, management, technology level and drilling equipments, all sorts of accidents resulting in significant human, financial, and material losses may occur, and thereby affect the exploration and development processes. A series of security problems caused by oil and gas drilling accidents have become the biggest obstacles, which are also the concerns of the state and government. How to assess the security situation in oil and gas drilling projects objectively with scientific methods and avoid the root causes of accidents effectively have become an important focus of studies.On the basis of the previous studies, this thesis has done a more systematic study on the related issues of oil and gas drilling safety assessment. Firstly, this paper reviewed domestic and international study status of oil and gas drilling safety assessment, and pointed out the research trend of this issue. Then the author built a comprehensive index system of safety assessment based on summarizing the characteristics of oil and gas drilling. Secondly, structural equation model and the fuzzy comprehensive assessment method are integrated, and the SEM-FSEM drilling safety assessment model is established, both of which are based on analysis of the traditional methods'advantages and disadvantages. Finally, the SEM-FSEM drilling safety assessment model was applied to X gas drilling project of XC Gas-field in Sichuan Basin. The result of study indicates that the assessment model is feasible and has practical significance.The progresses derived from the thesis are as follows:(1)Establishing safety evaluation index system of oil and gas drillingAccording to the previous studies, this thesis builds oil and gas drilling safety evaluation index system from the"man - machine - environment"perspective. The system is conducive to assess drilling safety scientifically and reasonably, which includes natural factors, management level, drilling equipment conditions, technology level and economic inputs.(2)Finding out the key factors of oil and gas drillingThrough finding out a large number of relevant documents, this paper designed a safety assessment questionnaire of oil and gas drilling, which helped to obtain some objective and accurate data. On the basis of it, the author finds the key risk factors according to using the path analysis method of structural equation model to clarify the relationship among various types of risk factors in drilling project(3)Designing oil and gas drilling safety assessment modelThe thesis applies SEM-FSEM model to the safety assessment of oil and gas drilling project. This model plays advantages of structural equation model and the fuzzy comprehensive evaluation. It not only clarifies the relationship between the various influencing factors, but also solves various problems of"fuzzy and uncertainty", so that the assessment results are more scientific and reasonable, and carries new ideas for safety assessment of drilling.(4)Proposing suggestions for improving safety level of oil and gas drilling projectsAccording to the assessment model worked in the oil and gas drilling, the thesis points out the key issues that we should pay attention to, and proposes suggestions for improving safety level of oil and gas drilling projects in terms of management, drilling conditions, and economic investments.