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Resistance strain load sensor for high pressure hydrogen sulfide environment

A resistance strain type, load sensor technology, used in instruments, measuring devices, measuring forces, etc., can solve the problems of lack of material/machine durability testing equipment and technology, no direct safety testing, etc., to extend service life, Guaranteed effect of accuracy and stability

Active Publication Date: 2016-05-11
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, my country still needs to further strengthen the safety guarantee in the high-pressure hydrogen sulfide environment: there is a lack of material / machine durability testing equipment and technology in the high-pressure hydrogen sulfide environment, and there is no direct safety testing of materials in the high-pressure hydrogen sulfide environment. ability

Method used

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  • Resistance strain load sensor for high pressure hydrogen sulfide environment
  • Resistance strain load sensor for high pressure hydrogen sulfide environment
  • Resistance strain load sensor for high pressure hydrogen sulfide environment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A load cell in a high-pressure hydrogen sulfide environment (such as figure 1 , 2 shown), including the upper sensor case 1, the lower sensor case 2 and the elastic body 3. The materials for the upper sensor case 1, the lower sensor case 2 and the elastic body 3 are all made of C-276 Hastelloy (commercially available), and the elastic body 3 are respectively threadedly connected with the sensor upper shell 1 and the sensor lower shell 2, and the middle part of the elastic body 3 is evenly distributed with foil strain gauges 4, and there is a piece of foil strain gauge 4 in the middle of each of the four faces of the middle part of the elastic body 3. The foil strain gauges 4 on the front and rear surfaces of the middle part of the body 3 are arranged laterally (refer to the attached image 3 ), the foil strain gauges 4 on the left and right surfaces in the middle of the elastic body 3 are arranged longitudinally, the foil strain gauges 4 are bonded to the elastic body ...

Embodiment 2

[0032] The difference between this embodiment and Embodiment 1 is that the thickness of the sensitive grid is 20 μm, and the composition of each element in the iron-based alloy by mass percentage is: the composition of each element in the iron-based alloy by mass percentage is: chromium 25%, 2% nickel, 2% molybdenum, 1% aluminum, 70% iron; the thickness of the iron transition layer is 100nm, and the thickness of the aluminum-zinc alloy layer is 100nm. The composition of each element of the aluminum-zinc alloy in terms of mass percentage is: 5% zinc and 95% aluminum.

[0033] The thickness of the aluminum oxide protective layer is 10nm, and the processing parameters of the plasma oxidation technology are: the frequency of the radio frequency source used is 15MHz, and the power of the radio frequency source is 2W / cm 2 , the gas source is a mixed gas mixed with argon and oxygen at a volume ratio of 10:1, the gas flow rate is 49 sccm, and the reaction chamber pressure is 8×10 4 P...

Embodiment 3

[0036] The difference between this embodiment and Embodiment 1 is that the thickness of the sensitive grid is 15 μm, and the composition of each element of the iron-based alloy in terms of mass percentage is: 10% chromium, 5% nickel, 4% molybdenum, 4% aluminum, iron 77%; the thickness of the iron transition layer is 100nm, and the thickness of the aluminum-zinc alloy layer is 100nm. The composition of each element of the aluminum-zinc alloy in terms of mass percentage is: 20% zinc and 80% aluminum.

[0037] The thickness of the aluminum oxide protective layer is 5nm, and the processing parameters of the plasma oxidation technology are: the frequency of the radio frequency source used is 12MHz, and the power of the radio frequency source is 2W / cm 2 , the gas source is a mixed gas mixed with argon and oxygen at a volume ratio of 7:1, the gas flow rate is 49 sccm, and the reaction chamber pressure is 5×10 4 Pa, the sensitive gate temperature is controlled at 250°C, and the oxida...

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Abstract

The invention discloses a resistance-strain type load sensor for a high-pressure hydrogen sulfide environment. The resistance-strain type load sensor comprises an upper housing, a lower housing and an elastomer; the elastomer is connected with the upper housing and the lower housing through threads; foil type strain sheets are uniformly distributed in the middle part of the elastomer and are adhered to the elastomer, wherein each foil type strain sheet comprises a sensitive grid, a base, a covering layer and an outlet line; the sensitive grid is adhered between the base and the covering layer through adhesive; the outlet line is connected with the sensitive grid, and the sensitive grid is manufactured through iron-based alloy; a hydrogen transmitting separating film is arranged on the surface of the sensitive grid; the iron-based alloy comprises the following elements in percentage by mass: 15 to 25% of chromium, 2 to 7% of nickel, 2 to 6% of molybdenum, 1 to 6% of aluminum, the balance of iron. With the adoption of the resistance-strain type load sensor for the high-pressure hydrogen sulfide environment, the shortcoming of large zero drifting and creeping are caused by corrosion damage of the existing load sensor under the high-pressure hydrogen sulfide environment and hydrogen invasion is overcome, the accuracy and stability of the measurement result are ensured, and the service life of thee senor is also prolonged.

Description

technical field [0001] The invention relates to a load sensor, in particular to a resistance strain type load sensor for a high-pressure hydrogen sulfide environment. Background technique [0002] With the increasing demand for oil and gas resources, the number of sour oil and gas fields is increasing year by year. Had to face the threat of hydrogen sulfide corrosion throughout the development process. Hydrogen sulfide can not only cause metal corrosion or perforation as an acidic medium, but also hydrogen sulfide can keep the hydrogen generated during the reaction with the metal in an atomic state. The intrusion of hydrogen atoms into the metal will cause hydrogen-induced cracking and stress corrosion cracking of the equipment. The form of hydrogen damage greatly reduces the service performance of materials and seriously threatens the safe production of sour oil and gas fields. [0003] Therefore, the stress-strain measurement of materials under hydrogen sulfide environme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L1/22
Inventor 周成双张林占生根陈兴阳
Owner ZHEJIANG UNIV OF TECH
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