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Wear-resistant anticorrosive sucker-rod coupling
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A sucker rod coupling, mass percentage technology, applied in drill pipe, drilling equipment, earthwork drilling, etc. The effect of carrying capacity
Active Publication Date: 2014-05-21
CHINA PETROLEUM & CHEM CORP +2
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Problems solved by technology
However, in the actual production and use process, it is found that the couplings sprayed and welded with the alloycoating are prone to cracks during production, and the defect rate is high. When using the couplings sprayed and welded with the alloy coating, there still exists The phenomenon that the coupling is worn, corroded and worn through the tubing, which is more likely to occur in the kickoff section of the wellbore
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Embodiment 1
[0033] Embodiment 1: In terms of mass percentage, the composition of the nickel-based alloy powder is selected as: C: 0.2%, Si: 2%, B: 5%, Cr: 23%, Fe: 3.7%, and the balance is nickel . In terms of mass percentage, the composition of the matrix 1 is selected as: C: 0.1%, Si: 0.4%, Mn: 0.7%, Cr: 2%, Mo: 0.6%, Ni: 0.6%, P: 0.025%, S: 0.025%, the balance is iron.
Embodiment 2
[0034] Embodiment 2: In terms of mass percentage, the composition of the nickel-based alloy powder is selected as: C: 0.3%, Si: 3%, B: 6%, Cr: 16%, Fe: 4%, and the balance is nickel . In terms of mass percentage, the composition of the matrix 1 is selected as: C: 0.13%, Si: 0.8%, Mn: 1.0%, Cr: 2.5%, Mo: 0.2%, Ni: 0.2%, P: 0.025%, S: 0.025%, the balance is iron.
Embodiment 3
[0035] Embodiment 3: In terms of mass percentage, the composition of the nickel-based alloy powder is selected as: C: 0.5%, Si: 4%, B: 4%, Cr: 19%, Fe: 3.5%, and the balance is nickel . In terms of mass percentage, the composition of the matrix 1 is selected as: C: 0.16%, Si: 1.2%, Mn: 0.4%, Cr: 1.5%, Mo: 0.4%, Ni: 0.4%, P: 0.025%, S: 0.025%, the balance is iron.
[0036] Secondly, under experimental conditions, the sample spray welding layer 2 in the above three embodiments is tested for corrosion and wear performance, and three 45 steel coupling samples are selected to test corrosion resistance and wear resistance, and then the present invention Corrosion resistance and wear resistance were compared and evaluated.
[0037] Corrosionresistance test The experimental process and results are as follows: the corrosion test was carried out in HCl solution with a concentration of 1mol / L and NaCl solution with a concentration of 3.5%, and the samples were soaked continuously for 13...
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Abstract
The invention discloses a wear-resistant anticorrosive sucker-rod coupling, relates to a coupling for connecting a sucker rod and aims to provide a wear-resistant anticorrosive sucker-rod coupling which has a high rate of finished products in the production process, is wear-resistant and anticorrosive when in use, and has low wear to an oil pipe. The wear-resistant anticorrosive sucker-rod coupling comprises a matrix and a spray weldingcoating spray-welded on the surface of the matrix. Alloypowder used by the spray weldingcoating comprises the following components in percentage by mass: 90 percent to 95 percent of nickel-based alloypowder and 5 percent to 10 percent of MoS2 powder, wherein the nickel-based alloy powder comprises the following components in percentage by mass: 0.2 percent to 0.5 percent of C, 2.0 percent to 4.0 percent of Si, 4.0 percent to 6.0 percent of B, 16 percent to 23 percent of Cr, less than or equal to 5 percent of Fe and the balance of nickel.
Description
technical field [0001] The invention relates to oil production equipment, in particular to a coupling for connecting sucker rods. Background technique [0002] The sucker rod coupling is a very widely used part in the oil productionsystem of the rod pump in the oil field. Through it, the connection between the sucker rods can be realized, so that the total length of the sucker rod can reach hundreds of meters or even thousands of meters underground. Crude layer. When the pumping unit in the oil field is working, the sucker rod moves up and down in the oil pipe, and the diameter of the sucker rod coupling is larger than that of the sucker rod, so the sucker rod coupling inevitably rubs and collides with the inner wall of the oil pipe. It is easy to cause the wear of the sucker rod coupling and the inner wall of the oil pipe, and the most direct impact of the wear is the firmness of the coupling and the thinning of the inner wall of the oil pipe, and even cause the separatio...
Claims
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