For decades, research on oil casing pipe damage has never stopped, and oil fields in various countries have invested huge manpower and material resources in research. People have studied the form, cause, numerical simulation, measurement method, and mechanism of casing damage from different perspectives such as petroleum geology, reservoir engineering, materials science and engineering, rock mechanics, material mechanics, geomechanics, seepage mechanics, and corrosion electrochemistry. And prevention.
However, due to the complexity of the problem of oil casing failure, the above-mentioned studies are generally carried out for a certain oil field, block and specific well conditions. Numerical simulations are often based on finite element analysis of a small local area around a single well, and lack of analysis of the above-mentioned problems. Multi-disciplinary, large-scale overall consideration, and because many problems in the failure of oil casing seem to be more suitable for analysis by means of numerical simulation, so far, no one has summarized people’s experience and knowledge of casing failure analysis for decades. Carry out expert system processing. Therefore, the treatment of casing damage is still ineffective at present, and oilfield casing damage still occurs frequently, which has become a major problem restricting the development of oilfields.
Petroleum casing damage
is commonly referred to as casing damage and casing deformation in the field of petroleum engineering. Petroleum casing failure refers to the general term for the deformation, rupture, misalignment and other damage forms of the casing when the load on the casing exceeds the bearing capacity of the casing due to factors such as engineering, geological, and production dynamic changes during the oilfield production process. In the process of oil and gas field development, especially in the middle and late stages of oil and gas field development, casing damage is a chronic disease that plagues the development of the petroleum industry in my country and the world. It is also one of the key issues affecting the development of the petroleum industry and improving its benefits.
Therefore, from a large number of complex data and processes such as oilfield geology, engineering, design, construction, production and development, and workover, it is very important to correctly identify the main reason for the failure of the oil casing as soon as possible, and to correctly determine the failure mechanism of the oil casing. important. However, the early studies and judgments on the causes and mechanisms of oil casing damage were done by experts in this field. In recent years, with the development of computer technology, the wide application of finite element methods, and the deepening of human understanding of rock mechanics, seepage mechanics, and elastoplastic mechanics, numerical simulation is increasingly used in the analysis of the causes of casing deformation. In order to analyze the failure of the casing, a method of both knowledge analysis and numerical analysis has been formed. Partial waste in any way cannot completely solve the problem of oil casing damage. However, knowledge analysis is the main method or even if numerical analysis can be used, but numerical analysis cannot solve all the problems in the field, it happens to be the world where expert systems can demonstrate their capabilities.
So far, the research on the failure of petroleum casing has basically stayed on the knowledge analysis or numerical analysis of the failure form of a single casing. No one is engaged in establishing a rapid expert system that can cover the entire oil field and deal with all the failure problems of petroleum casing. Perform unified analysis and processing. The establishment of an expert system covering the entire oil casing damage has important theoretical and practical significance for the treatment of casing damage in oilfields in my country and the world.
Analysis of oil casing damage mechanism is a complex, arduous and creative work. It is a systematic engineering involving oilfield geology, drilling engineering (drill pipe
), the formulation and adjustment of overall development plans, and the adoption of production measures; prevention, delay and resolution of oil casing damage is the core. This work also has important guiding significance for the geological and engineering design of the new well construction, the adjustment of the oilfield development plan, and the formulation of production measures. It is possible to quickly build an oil casing fault detection system to provide convenience for oil casing fault monitoring.