Enhancement Method and Safety Analysis of Sealing Unit in Gas Packer
The gas packer rubber is a key part for achieving separate layer and interval production of gas wells.The conventional three-unit rubber barrel structure is prone to initial failure during setting,which will lead to a decrease in the overall stress level of the rubber barrel and insufficient reserve of sealing safety.Therefore,an en-hancement method of multi-material combination sealing unit was proposed for the design of sealing unit of HPHT105-232-V0 hydrogen sulfide bearing high-temperature and high-pressure gas packer.Then,the constitutive model parameters of rubber were obtained based on tensile test and Yeoh theory.Third,the stress and deformation law of the rubber barrel were analyzed at a temperature of 204℃,a setting force of 200 kN and an annular pressure of 70 MPa.Finally,the sealing safety of the enhanced unit was tested.The analysis results show that the maximum deformation of the sealing unit rubber barrel of HPHT105-232-V0 packer is 94.785 mm,and the maximum con-tact stress is 240 MPa,located in the contact area of the metallic protective ring and the casing.Moreover,based on API standard,physical testing was conducted on HPHT105-232-V0 packer,initial failure did not occur in the rubber barrel during setting,and the overall stress level of the sealing unit was increased.In the process of stabili-zing the pressure,the pressure drop range of the rubber barrel is less than 1%.In the whole course of test,gas bubble did not overflow from the sealing unit.After the packer was unloaded,there was no obvious plastic deforma-tion in the rubber barrel structure.The research results show that the multi-material combination sealing unit de-signed using this enhancement method has good sealing performance,and meets the sealing safety requirements in extreme environments.
gas well productiongas packermulti-material combination sealing unitsafety testhigh-temperature and high-pressureenhancement method
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