Multi-point Sets Of Long Sections Of Damaged Wells Sealed Reinforcement Repair Process Design Study

With the oil field entering the last production period, the casing damages of the oil production wells or the water injections became more and more general, because of the infection of the complex under-earth structure , corrosive environment, the anti-corrosion capacity of metals, and other unconfirmed factors. Casing repair have become one of the most important tasks in oil field exploring and production.The casing repair technology has been promoting greatly in recent decades, but them still can not satisfy the requirement of new updating changes, for reason that with the oil produced year by year, casing damage is speeding up and damage degree is getting worse, types of casing damage is getting more complex. Developing an economic and valid pressurized and enhanced Casing Repair Technology for multiply casing damages with long damaged segment becomes the earnest issue in well repair area.By analyzing the five kinds of former casing repair technology and considering the equipment capacity and technology used in oil field, a pressurized and enhanced Casing Repair Technology for multiply casing damages with long damaged segment is developed. This new technology can repair complex casing damages in any depth of well. Besides that, it has the following advantages: only the general equipments in the oil field are used, technology is simple, well servicing is convenient, cost repairing is economic.The thesis focuses on the studies and designs of the general technology procedure, especially on the research of the pressurized anchor that is the key component of this technology. Several experimental rigs are designed to testify the functions of the technology. The experiment in lab and the implementation in worksite show that this casing repair technology is available in science and profitable in economy.