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Hydrogen sulfide concentration control device for sulfide stress corrosion uniaxial tensile test

A technology of stress corrosion and uniaxial stretching, which is applied in the direction of testing wear resistance, etc., can solve the problems of high cost of sulfur-resistant drill pipe and low concentration of hydrogen sulfide, and achieve the effect of reducing hydrogen sulfide gas consumption and simple structure

Inactive Publication Date: 2014-06-18
上海海隆石油钻具有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Drilling tool manufacturers and R&D institutions at home and abroad all adopt the IRP1.8 standard to produce sulfur-resistant drill pipes. The hydrogen sulfide stress corrosion resistance is uniaxially pulled under the saturated hydrogen sulfide concentration according to the A method in the NACE TM0177 standard. However, in the actual oil and gas field production, the concentration of hydrogen sulfide in some production blocks is not high at present, which is an unsaturated state, and the sulfur-resistant drill pipe developed and produced by the IRP1.8 standard has a high cost and is far away. Higher than the requirements of some oilfield service environments

Method used

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  • Hydrogen sulfide concentration control device for sulfide stress corrosion uniaxial tensile test
  • Hydrogen sulfide concentration control device for sulfide stress corrosion uniaxial tensile test
  • Hydrogen sulfide concentration control device for sulfide stress corrosion uniaxial tensile test

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Embodiment 1

[0011] Embodiment 1, using the device of the present invention to configure a hydrogen sulfide aqueous solution with a concentration of about 0.01mol / L, the steps are as follows:

[0012] Since hydrogen sulfide aqueous solution is a weak acid, the ionization in water is as follows:

[0013] h 2 SH + +HS - The first order ionization constant is about 9.5×10 -8

[0014] HS - H + +S 2- The secondary ionization constant is about 7.1×10 -15

[0015] Therefore, its secondary dissociation can be ignored. Hydrogen sulfide gas can be electrolyzed as a monobasic weak acid in pure water. Assuming that the solution concentration is C, its H + The corresponding relationship between concentration, dissociation coefficient and solution concentration is as follows:

[0016] In analytical chemistry, [H + ] or [OH - ] The relative error allowed for calculation is generally within ±5%. When KaC in the solution>20Kw, [H + ] can be calculated using the approximate formula

[0017] ...

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Abstract

The invention relates to a hydrogen sulfide concentration control device for a sulfide stress corrosion uniaxial tensile test. The device comprises a test container, wherein one ends of a hydrogen sulfide inlet duct and a nitrogen inlet duct are respectively connected to the test container; a hydrogen sulfide inlet pipe switch and a hydrogen sulfide inlet pipe flow controller are arranged on the hydrogen sulfide inlet duct outside the test container; a nitrogen inlet duct switch and a nitrogen inlet duct flow controller are arranged on the nitrogen inlet duct outside the test container; one end of a gas outlet duct is connected to the test container; a gas outlet pipe switch is arranged on the gas outlet duct outside the test container; a pH measuring instrument is connected to the test container. A hydrogen sulfide resistant drill rod is subjected to sulfur resistance detection in an environment with different hydrogen sulfide concentrations according to a method A in the NACE TM0177 standard.

Description

technical field [0001] The invention relates to a test device for petroleum drill pipes in a hydrogen sulfide (H2S) corrosive environment, in particular to a hydrogen sulfide concentration control device for sulfide stress corrosion uniaxial tensile tests. Background technique [0002] Drill pipe is the main tool in the process of oil and natural gas exploitation. With the increasing demand for energy, especially green energy such as natural gas, and the safe exploration and development of hydrogen sulfide-containing gas fields in China, the research and development of hydrogen sulfide-resistant drill pipe is gradually was raised to a high position. [0003] Drilling tool manufacturers and R&D institutions at home and abroad all adopt the IRP1.8 standard to produce sulfur-resistant drill pipes. The hydrogen sulfide stress corrosion resistance is uniaxially pulled under the saturated hydrogen sulfide concentration according to the A method in the NACE TM0177 standard. Howeve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/56
Inventor 余世杰袁鹏斌周勇其李云利赵金凤龚丹梅
Owner 上海海隆石油钻具有限公司
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