Research On Casing Failure Mechanism And Prevention Techniques In Changqing Oil Field

Casing failure caused great losses and Affecting well safety production. Studies and field data shown that casing failure reasons mainly by geological, engineering and corrosion environments. Casing failure forms include mechanics failure, corrosion failure and their acting together. Casing out and in surface corrosion exists in many oil and gas well, especially in Changqing oil field. Casing corrosion is the main harms to abrupt well watered. This article aims at discussing the problem of long serious casing corrosion in Changqing oil field. We have achievements in governing casing damage for many years. On this base, we have grasped corrosion mechanism and corrosion speed of casing in deferent regions of Changqing oil field by corrosive researches of the LuoHe water ,testing of corrosion coupon down the well and checking the damaged casing pulled out from the well. At the same time, via precursory research and appraise of anticorrosion technology, the projects of corresponding casing anticorrosion and controlling had been put forward, which settled firm foundation for ultimately restrict the rise of well casing damage.