1.CNOOC Energy Technology Services Oil Production Services Company;2.College of Mechanical and Electronic Engineering,China University of Petroleum East China
The implementation of rod pumping technology on offshore platforms is one of the effective ways to improve the thermal recovery efficiency of offshore heavy oil, but platform safety is the prerequisite for the implementation of new technologies. Based on the limit working state and the cumulative damage theory of the structure, the safety evaluation standard for the increased load of the jacket platform is established. For the jacket platform, the mechanical model of the offshore platform under the joint action of the marine environment-rod pumping is established. Taking the LD platform as an example, the extreme oceanic environmental load of 50 years is selected, and the loading threshold of the target platform is obtained based on the safety criterion. According to the design-rated load of the rod mining, the safety factor of the LD platform is reduced by no more than 3% before and after loading, so that the jacket platform has sufficient structural strength to withstand the additional loads generated by the rod lift process.