Casing Damage Wells In Yulin Gas Field Management Technology Research

A large number of data and research show that the casing damage is mainly caused by thegeologic factors, engineering factors and corrosion environment etc.. The form of casingdamage can be divided into mechanical failure, corrosion failure and combination of the two.Oil well casing damage has created incalculable loss for oil production for a long time.Itseriously affects the downhole operation quality and restrict the oil and gas production andsustainable development.Yulin gas field locates in the northeastern part of Erdos Basin, where gas explorationbegan in the early ninety’s and the earliest production wells has been more than10years. Withthe increase of service time of Yulin gas field, gas well casing damage problem is becomingincreasingly prominent.According the research, Yulin gas field is the field of high content of CO2. CO2oil casingcorrosion to the oil casing tends to be more serious problems, particularly the pitting corrosionproblems. Gas wellhead leakage problem of Yulin gas field is very serious, which is relatedwith pitting or crevice corrosion according to the preliminary diagnosis.According to the casing damage conditions and underground conditions of Yulin gas field,technical route of wellhead gas welding repair technology and gas power patch is formulatedand an available construction scheme is supplied for the next step of casing subsidy for Yulingas field.By using the comprehensive evaluation theory and method, comprehensive evaluationsystem for Yulin gas field evaluation is eatablished to evaluate the comprehensive treatment ofcasing damage system.Depends on the evaluation,Yulin gas field is in the medium level andneeds to take effective method to treat casing damage problem so as to provide guarantee forthe sustainable development of Yulin gas field.