Silicon carbide ceramic cylinder sleeve for well-drilling slurry pump and preparation method of silicon carbide ceramic cylinder sleeve

A silicon carbide ceramic and drilling mud technology, which is applied in the field of silicon carbide ceramic cylinder liner for drilling mud pump and its preparation, can solve the problems of pulverization, low fracture toughness of alumina cylinder liner, no obvious advantage in wear resistance, etc. Small corrosion rate, uniform and dense internal structure, excellent chemical corrosion resistance and other effects

Inactive Publication Date: 2015-07-08
NINGXIA MACHINERY RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the cylinder liner is in direct contact with the mud, it is easily worn by tiny sand particles or corroded by acid and alkali during work, which eventually leads to the scrapping of the cylinder liner, which seriously affects the drilling efficiency and drilling cost. For example, for offshore drilling, the drilling ship The comprehensive daily rate is between 1.2 million and 3 million RMB / day. If the pump is shut down for one hour to repair, the loss is about 100,000 RMB
[0003] Mud pumps first used metal cylinder liners, and their life span was up to 200 hours. Corrosion, the zirconia ceramic cylinder liner will be pulverized after long-term use at a temperature of 100-250 ℃, which will reduce the wear resistance; the alumina cylinder liner has the disadvantages of low fracture toughness and easy cracking of the product; while zirconia toughened alumina The Vickers hardness of the ceramic cylinder liner is as low as 14GPa, so that there is no obvious advantage in wear resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) Weigh 100kg of submicron silicon carbide powder, 0.2kg of submicron boron carbide powder, 12kg of nano carbon black, and 6kg of polyvinyl alcohol. Add 100kg of water, mix thoroughly for 15 hours, and pass through a 100-mesh sieve.

[0025] 2) Spray and granulate the sieved slurry. Among them, the hot air inlet temperature of the prilling tower is 200°C, and the outlet temperature is 110°C. Then sieve the granulated powder with an 80-mesh sieve, and the bulk density of the powder is 0.84g / cm 3 , fluidity 12s / 30g.

[0026] 3) Put the screened granulated powder into a self-made mold, vibrate and seal it, and then perform cold isostatic pressing at a pressure of 160 MPa; put the pressed green body into an oven to dry and solidify at about 150°C; The body is machined.

[0027] 4) Protected sintering under normal pressure atmosphere, the sintering temperature is 2200°C, sintering is 42 hours, holding time is 2h, and the furnace is cooled at 160°C.

[0028]...

Embodiment 2

[0030] 1) Weigh 100kg of submicron silicon carbide powder, 2.0kg of submicron boron carbide powder, 17kg of nano carbon black, 7kg of polyvinyl alcohol, and 6kg of dextrin. Add 100kg of water, mix thoroughly for 18 hours, and pass through a 100-mesh sieve.

[0031] 2) Spray and granulate the sieved slurry. Among them, the hot air inlet temperature of the prilling tower is 200°C, and the outlet temperature is 110°C. Then sieve the granulated powder with an 80-mesh sieve, and the bulk density of the powder is 0.82g / cm 3 , fluidity 12.6s / 30g.

[0032] 3) Put the screened granulated powder into a self-made mold, vibrate and seal it, and then perform cold isostatic pressing at a pressure of 160 MPa; put the pressed green body into an oven to dry and solidify at about 150°C; The body is machined.

[0033] 4) Protected sintering under normal pressure atmosphere, the sintering temperature is 2200°C, sintering is 42 hours, holding time is 2h, and the furnace is cooled a...

Embodiment 3

[0036] 1) Weigh 100kg of submicron silicon carbide powder, 3.5kg of submicron boron carbide powder, 19kg of nano carbon black, 7kg of carboxymethyl cellulose, and 11kg of polyvinyl alcohol. Add 100kg of water, mix thoroughly for 25 hours, and pass through a 100-mesh sieve.

[0037] 2) Spray and granulate the sieved slurry. Among them, the hot air inlet temperature of the prilling tower is 200°C, and the outlet temperature is 110°C. Then sieve the granulated powder with an 80-mesh sieve, and the bulk density of the powder is 0.80g / cm 3 , fluidity 12.3 s / 30g.

[0038] 3) Put the screened granulated powder into a self-made mold, vibrate and seal it, and then perform cold isostatic pressing at a pressure of 160 MPa; put the pressed green body into an oven to dry and solidify at about 150°C; The body is machined.

[0039] 4) Protected sintering under normal pressure atmosphere, the sintering temperature is 2200°C, sintering is 42 hours, holding time is 2h, and the f...

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Abstract

The invention relates to a silicon carbide ceramic cylinder sleeve for a well-drilling slurry pump. The silicon carbide ceramic cylinder sleeve is composed of micron silicon carbide, submicron boron carbide powder, nanometer carbon black, and an organic binder, the amount ratios of which are, per one hundred grams of dried submicron boron carbide powder, 0.2-4.8% of submicron boron carbide powder, 12-25% of nanometer carbon black, and 6-25% of the organic binder. According to the invention, silicon carbide is taken as a raw material, and the silicon carbide ceramic cylinder sleeve is obtained via iso-static cool pressing and pressureless sintering. The hardness of the resultant silicon carbide ceramic cylinder sleeve can reach more than 26GPa, and is good in abrasive resistance, excellent in chemical resistance, and uniform and dense in inner organization structure. After the silicon carbide ceramic cylinder sleeve is subjected to fine machining, the internal surface smoothness can reach Ra0.2, and the service life can reach 4500 hours. The silicon carbide ceramic cylinder sleeve in the invention can work in mediums, such as well-drilling slurry or other liquid with high corrosivity.

Description

technical field [0001] The invention belongs to the technical field of ceramic preparation, and in particular relates to a silicon carbide ceramic cylinder liner for a drilling mud pump and a preparation method thereof. Background technique [0002] The cylinder liner is the core part of the mud pump, which has the functions of storing mud, bearing pressure and completing the suction and discharge of mud. Because the cylinder liner is in direct contact with the mud, it is easily worn by tiny sand particles or corroded by acid and alkali during work, which eventually leads to the scrapping of the cylinder liner, which seriously affects the drilling efficiency and drilling cost. For example, for offshore drilling, the drilling ship The comprehensive daily rate is between 1.2 million and 3 million RMB / day, and if the pump is shut down for one hour to repair, the loss is about 100,000 RMB. [0003] Mud pumps first used metal cylinder liners, and their lifespan was up to 200 hou...

Claims

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Application Information

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IPC IPC(8): C04B35/565C04B35/622
Inventor 保玉芝李虎赵文林姜伟梁红军
Owner NINGXIA MACHINERY RES INST
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