HydraulicHydraulic O-ring corrosion resistance in harsh corrosive environments

Hydraulic O-ring is a rubber element is used widely, mainly in the packers, wellhead equipment, gauges and other equipment as a seal. Hydraulic O-ring sealing performance depends mainly on the merits of a rubber material corrosion resistance in harsh corrosive environments. At high temperature and pressure conditions of high levels of H2S and CO2, O-ring seal hydraulic failure mainly as a rubber material swelling and aging, resulting in a hydraulic O-ring shape changes, restitution, inelastic hydraulic seals, hydraulic seals elastic contact stress between the ring and the equipment is released, resulting in acid gas leak. Sour gas leak will cause the wellbore annulus with the wellbore pressure, ground acidic gas leakage will cause environmental pollution, even when serious casualties. Currently, the O-ring hydraulic mechanical properties and sealing performance test limited to their former service, while the O-ring hydraulic service always have to withstand high temperature, high pressure, high content of the corrosive effect of the acidic medium, so the physical and mechanical properties and sealing properties the test results have only in the early completion of the reference value, and in the late mining can reliably serve no reference value. At present, the acid corrosion media about Hydraulic O-ring rarely reported, for the present at a pressure of 60 MPa working temperature of 175 ? gas composition (volume fraction) H2S 20%, CO2 5%, CH4 75% harsh environments.

A pressure of 60 MPa at a temperature of 175 ? gas composition (volume fraction) H2S20%, CO2 5%, CH4 75% of the harsh environment by comparing fluorocarbon rubber, fluorosilicone rubber and tetrapropoxysilane Viton O-ring hydraulic three kinds etched with an acidic medium dimensions, mass and volume change rate, physical and mechanical properties were studied three kinds of hydraulic O-ring corrosion resistance. The results showed that the geometry after acidic medium corrosion Tetrapropanate fluorine hydraulic O-ring, and the rate of change of the volume and quality of Shore A hardness significantly lower than the other two kinds of rubber, after etching the tensile strength and elongation at break is much greater than the remaining two kinds of rubber, fluorine rubber described Tetrapropanate has good acid corrosion medium; fluorocarbon rubber and silicone rubber fluorine gas, liquid corrosive media are bubbling phenomenon occurs, the plastic deformation and erosion more serious, Tetrapropanate Viton appear in the vapor phase corrosion medium bubbling phenomenon, while in a liquid corrosive media found no bubbling phenomenon, and the two kinds of corrosive media corrosion phenomena were not there.

The rate of mass change fluorosilicone rubber O-ring hydraulic maximum, minimum fluorocarbon rubber; after etching liquid, the rate of change is still the quality fluorosilicone rubber O-ring hydraulic maximum, minimum Tetrapropanate fluorine rubber, and far less than the remaining two kinds rubber; at the same time, the rate of change in the quality of corrosion after three hydraulic rubber O-ring is much smaller than the liquid vapor after etching. After the vapor etching rate of volume change fluorosilicone rubber O-ring hydraulic maximum; after etching liquid, the volume rate of change of fluorocarbon rubber O-ring maximum; the rate of volume change after fluorocarbon rubber gas phase corrosion is slightly larger than the liquid phase after etching after the rate of volume change fluorosilicone rubber vapor phase corrosion after about 2 times after etching, and the rate of volume change Tetrapropanate Viton O-ring is greater than the vapor phase corrosion after corrosion, corrosion in hydraulic Tetrapropanate Viton O the rate of change in mass and volume of the smallest ring, fluoro silicone rubber O-ring hydraulic greatest change.

Fluorocarbon rubber, fluoro silicone rubber, fluorine rubber Tetrapropanate three kinds of hydraulic O-ring, and by the geometry of gas and liquid phases after acidic medium corrosion Tetrapropanate fluorine hydraulic O-ring, quality and volume, and Shore A hardness changes were significantly lower than the other two kinds of rubber, after etching the tensile strength and elongation at break is much larger than the remaining two kinds of rubber, fluorine rubber Tetrapropanate has good acid gas corrosion.

b fluorocarbon rubber and silicone rubber fluorine gas, liquid corrosive media are bubbling phenomenon occurs, the plastic deformation and erosion more serious, Tetrapropanate Viton bubbling phenomenon occurs in the gas phase corrosion medium in liquid corrosive media not found bubbling phenomenon, and the two kinds of corrosive media corrosion phenomena were not there. O-ring corrosion resistance in harsh corrosive environments

Hydraulic O-ring is a rubber element is used widely, mainly in the packers, wellhead equipment, gauges and other equipment as a seal. Hydraulic O-ring sealing performance depends mainly on the merits of a rubber material corrosion resistance in harsh corrosive environments. At high temperature and pressure conditions of high levels of H2S and CO2, O-ring seal hydraulic failure mainly as a rubber material swelling and aging, resulting in a hydraulic O-ring shape changes, restitution, inelastic hydraulic seals, hydraulic seals elastic contact stress between the ring and the equipment is released, resulting in acid gas leak. Sour gas leak will cause the wellbore annulus with the wellbore pressure, ground acidic gas leakage will cause environmental pollution, even when serious casualties. Currently, the O-ring hydraulic mechanical properties and sealing performance test limited to their former service, while the O-ring hydraulic service always have to withstand high temperature, high pressure, high content of the corrosive effect of the acidic medium, so the physical and mechanical properties and sealing properties the test results have only in the early completion of the reference value, and in the late mining can reliably serve no reference value. At present, the acid corrosion media about Hydraulic O-ring rarely reported, for the present at a pressure of 60 MPa working temperature of 175 ? gas composition (volume fraction) H2S 20%, CO2 5%, CH4 75% harsh environments.

A pressure of 60 MPa at a temperature of 175 ? gas composition (volume fraction) H2S20%, CO2 5%, CH4 75% of the harsh environment by comparing fluorocarbon rubber, fluorosilicone rubber and tetrapropoxysilane Viton O-ring hydraulic three kinds etched with an acidic medium dimensions, mass and volume change rate, physical and mechanical properties were studied three kinds of hydraulic O-ring corrosion resistance. The results showed that the geometry after acidic medium corrosion Tetrapropanate fluorine hydraulic O-ring, and the rate of change of the volume and quality of Shore A hardness significantly lower than the other two kinds of rubber, after etching the tensile strength and elongation at break is much greater than the remaining two kinds of rubber, fluorine rubber described Tetrapropanate has good acid corrosion medium; fluorocarbon rubber and silicone rubber fluorine gas, liquid corrosive media are bubbling phenomenon occurs, the plastic deformation and erosion more serious, Tetrapropanate Viton appear in the vapor phase corrosion medium bubbling phenomenon, while in a liquid corrosive media found no bubbling phenomenon, and the two kinds of corrosive media corrosion phenomena were not there.

The rate of mass change fluorosilicone rubber O-ring hydraulic maximum, minimum fluorocarbon rubber; after etching liquid, the rate of change is still the quality fluorosilicone rubber O-ring hydraulic maximum, minimum Tetrapropanate fluorine rubber, and far less than the remaining two kinds rubber; at the same time, the rate of change in the quality of corrosion after three hydraulic rubber O-ring is much smaller than the liquid vapor after etching. After the vapor etching rate of volume change fluorosilicone rubber O-ring hydraulic maximum; after etching liquid, the volume rate of change of fluorocarbon rubber O-ring maximum; the rate of volume change after fluorocarbon rubber gas phase corrosion is slightly larger than the liquid phase after etching after the rate of volume change fluorosilicone rubber vapor phase corrosion after about 2 times after etching, and the rate of volume change Tetrapropanate Viton O-ring is greater than the vapor phase corrosion after corrosion, corrosion in hydraulic Tetrapropanate Viton O the rate of change in mass and volume of the smallest ring, fluoro silicone rubber O-ring hydraulic greatest change.

Fluorocarbon rubber, fluoro silicone rubber, fluorine rubber Tetrapropanate three kinds of hydraulic O-ring, and by the geometry of gas and liquid phases after acidic medium corrosion Tetrapropanate fluorine hydraulic O-ring, quality and volume, and Shore A hardness changes were significantly lower than the other two kinds of rubber, after etching the tensile strength and elongation at break is much larger than the remaining two kinds of rubber, fluorine rubber Tetrapropanate has good acid gas corrosion.

b fluorocarbon rubber and silicone rubber fluorine gas, liquid corrosive media are bubbling phenomenon occurs, the plastic deformation and erosion more serious, Tetrapropanate Viton bubbling phenomenon occurs in the gas phase corrosion medium in liquid corrosive media not found bubbling phenomenon, and the two kinds of corrosive media corrosion phenomena were not there.