高温高压测试封隔器胶筒的研制

Development of rubber barrel for HTHP test packers

针对中国西北和西南地区超深、超高温、高压油气井测试封隔器胶筒性能指标不达标问题,研制了与?193.7 mm测试封隔器相配套的高温高压测试封隔器胶筒。采用三胶筒结构设计,中间胶筒起密封作用,2个端胶筒硫化钢网和拉伸弹簧增强承压能力和回缩能力;优选了FKM(氟化橡胶)材料,提高了胶筒耐温性能;通过有限元分析,验证了胶筒结构设计和硬度可以满足设计需求。依据API 11D1标准对封隔器高温高压密封性能进行了室内测试,承压试验结果表明,封隔器胶筒达到了204℃、105 MPa、V0级。将胶筒与现有测试封隔器装配,进行了样机试验,结果表明,工具在150℃升温到204℃情况下封隔器胶筒下部和上部均承压差105 MPa,胶筒尺寸参数变化率在5%以内,现场应用进一步验证了该胶筒的可靠性。该测试封隔器的研制成功可助力于超深、超高温、高压油气田的高效开发。

Considering the unqualified performance of rubber barrels of test packers for ultra-deep,ultra-high-temperature,highpressure wells in Northwest and Southwest China,a high-temperature high-pressure(HTHP)rubber barrel was developed forØ193.7 mm test packers.This invention adopts a triple-rubber structure design,in which the middle rubber works to seal,and the vulcanized steel mesh and tension spring of two end rubbers enhance the pressure-bearing capacity and retraction capacity.Fluorocarbon(FKM)rubber was selected to improve the thermal resistance of the rubber barrel.Through finite element analysis,it is verified that the structure design and hardness of the rubber barrel can meet the design requirements.According to API 11D1,the HTHP sealing performance of the packer was tested in the laboratory.The pressure test results show that the packer rubber barrel is rated for 204℃,105 MPa and V0 grade.The rubber barrel was assembled into the existing testing packer for prototype tests.The lower and upper parts of the packer managed to sustain pressure differences of 105 MPa,and the change rate of the dimensions of the packer was less than 5%,when the tool was heated from 150℃to 204℃.The reliability of the packer was further verified via field applications.The successful development of the testing packer promotes the efficient development of ultra-deep,ultra-high-temperature,high-pressure oil and gas fields.