Differential pressure reciprocating cementing vibrator and method

Abstract

The invention relates to the field of petroleum well cementation, and provides a differential pressure reciprocating type well cementation vibrator. The differential pressure reciprocating type well cementation vibrator comprises a cylindrical body, a cylindrical isolating unit, a pressure regulating mechanism and an impact body. The end of the cylindrical body is connected with a sleeve. The cylindrical isolating unit is located inside the body and connected with the body. The pressure regulating mechanism used for producing the differential pressure is fixed to the isolating unit. The impact body is connected with the isolating unit through an elastic piece, when a fluid channel of the pressure regulating mechanism is opened, the impact body is located at the first position, and when the fluid channel of the pressure regulating mechanism is closed, the impact body moves to the second position at the downstream position of the first position through the pressure of cement paste. The invention further provides a method using the well cementation vibrator. The vibrator and method solve the problems that underground vibration controllability is poor, the torque action is produced on the sleeve, and a grouting channel is blocked and is out of operation.

Description

technical field [0001] The invention relates to a vibrator and method for petroleum cementing operations, in particular to a differential pressure reciprocating cementing vibrator and method, belonging to the field of petroleum cementing. Background technique [0002] The so-called vibration cementing technology refers to the technology of vibrating the cement slurry by mechanical vibration, hydraulic pulse or hydraulic impact before the cement slurry solidifies, so as to improve the cementing quality. In the late 1990s, in order to prevent oil, gas and water channeling after cementing, and referring to the construction concrete vibration technology, Haberman and others in the United States proposed the top cement slurry pulse vibration cementing technology, that is, after the cement injection, from the wellhead to the ring The cement slurry in the air waiting stage is subjected to pulse vibration to keep the cement slurry in a low-speed motion state and improve the compress...

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Problems solved by technology

[0004] In view of the poor frequency controllability of the downhole vibration generator used in the prior art, a certain torque effect is generated on the casing, and at the same time, problems such as blockage and failure of the grouting channel may occur, the purpose of the present invention is to propose a pressure difference reciprocating solid The well vibrator has a simple structure and few parts, so it is easy to install and has stable performance, which greatly improves the cementing time

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