Abstract:

With the development of petroleum industry, especially exploitation of offshore oil and gas, many high temperature oilgas wells appear, liquid produced from these wells makes temperature increase fast around the casing, liquid sealed in annulus will expand with high temperature and force an additional load to annulus. The additional pressure will reach internal pressure strength and collapse resistance of casing, so the additional load caused by high temperature oil and gas brings many safety questions. Authors of this paper summarize several methods to prevent the additional load of casing duo to increasing temperature, make comparison by their scope of application, reliability and cost, and establish two kinds of additional load prevention models. According to both models, the authors give feasible easure to prevent the additional load mentioned above.

Key words: casing, temperature, additional load, prevention model, prevention method