Research on the Development, Testing, and Evaluation of the Dual-Opening Anti-Blowout Oil Draining Device

Abstract

During the tripping of the sucker rods and tubing from the wells with sucker rod pumps (SRP) in Tarim Oilfield, there are multiple challenges encountered, such as heavy oil, deep pumping, substantial load differences, and corrosive gas like H2S, etc., making the traditional anti-blowout oil draining device inefficient for operational needs and environmental requirements during pumping and intervention of the producing wells. In order to resolve such problems, Tarim Oilfield has developed a novel anti-blowout oil draining device with dual-opening function of rupturing + impacting by referring to the structure of high-pressure rupturing oil draining device with high opening success rate and conducting structure analysis, strength checks, and flow capacity calculations of the oil draining valves. The novel anti-blowout oil draining devices have passed a series of mechanical tests, corrosion resistance tests, and functional tests, such as indoor constant tensile stress-corrosion test, tensile strength test, collapse strength test, HIC test, electrochemical corrosion test, and tests of tool opening and closing, making up and breaking out, etc. The theoretical calculation and test show that the novel dual-opening anti-blowout oil draining device can not only meet the requirements of deep pumping, high gas-liquid ratio, substantial loading differences, and H2S corrosion resistance, but also be used in highly deviated wells, horizontal wells, and heavy oil producers. To conclude, the novel anti-blowout oil draining device will not pose any impacts on pump colliding operations. Moreover, the pump colliding operation can be used to eliminate the gelled debris attached to the pump valve and ball seat while ensuring anti-blowout oil drainage, returning the producer back to normal production.