Mud pump piston rubber and preparation method thereof

Abstract

The invention relates to mud pump piston rubber and a preparation method thereof, and relates to the technical field of rubber processing. The mud pump piston rubber comprises an inner rubber column and an outer rubber bowl, wherein the inner rubber column is arranged outside a piston in a sleeving mode, and the outer rubber bowl is arranged outside the inner rubber column and subjected to hot-press gluing treatment, and one side of the outer rubber bowl is an inwards-concave conical surface; and one end of the inner rubber column is higher than the inner concave conical surface, and a sealing rubber body is arranged between the outer side of the inner rubber column and the inner concave conical surface. Compared with an existing rubber, the mud pump piston rubber has the advantages that the mud pump piston rubber is structurally composed of the outer rubber bowl and the inner rubber column in a hot-press gluing mode, the outer rubber bowl provides good sealing performance and lubricating effect, the reciprocating work smoothness is improved after the outer rubber bowl is assembled with the piston, and meanwhile, the inner rubber column can provide enough supporting strength for the contact face of the inner rubber column and a piston core, the rubber is prevented from forming cracks extending from inside to outside, and the service life of the rubber is prolonged.

Description

technical field [0001] The invention belongs to the technical field of rubber processing, and in particular relates to a mud pump piston rubber and a preparation method thereof. Background technique [0002] Mud pump is a commonly used equipment in oilfield drilling. In the commonly used positive circulation drilling, it uses the surface flushing medium clean water, mud or polymer flushing fluid under a certain pressure to pass through the high-pressure hose, the faucet and the center hole of the drill string. It is sent directly to the bottom of the drill bit to achieve the purpose of cooling the drill bit, removing the cut cuttings and transporting them to the surface. The commonly used mud pump is piston or plunger type. The piston or plunger reciprocates in the pump cylinder to Realize the purpose of pressure feeding and circulating flushing fluid; [0003] The piston assembly is one of the main parts of the fluid end system of the mud pump, and it is also one of the vu...

AI Technical Summary

Problems solved by technology

[0004] Existing piston rubber is integrally molded by vulcanization, and the inner and outer layers have the same tissue strength, but in actual use, first, the inner layer of the rubber needs to provide sufficient support strength for the contact surface with the piston core, otherwise it is easy to cause the rubber to form and extend from the inside to the outside The cracks affect the assembly between the rubber and the piston and reduce the service life. Second, the outer layer of the rubber reciprocates with the piston and needs to have a good seal. The outer layer of the rubber is required to meet the requirements of sufficient tensile flexibility. At the same time, better lubricity is required to ensure the effect of reciprocating operation, otherwise it will easily cause problems such as tearing, sealing, and poor reciprocating operation, which will affect the normal use of the piston assembly;

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