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Operation method for safely passing through neutral point during tripping of string in under-pressure operation process

A technology of pressurized operation and operation method, applied in drilling equipment and methods, drill pipe, casing, etc., can solve the problems of abolishing the top of the pipe string, equipment damage, well control risk, personnel injury, etc., so as to avoid personnel injury. , The effect of safety in the process of working under pressure

Pending Publication Date: 2021-03-09
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Because the reverse clamping force of Cavins slips is only the weight of 2 strings (about 140KG), the existing operation method is not suitable for Cavins slips to safely pass the "neutralization point". , may lead to the abolition of the pipe string topping or the risk of the pipe string falling into the well, which will cause personal injury, equipment damage and significant well control risk

Method used

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  • Operation method for safely passing through neutral point during tripping of string in under-pressure operation process

Examples

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Effect test

example 1

[0047] Taking the complement of the hydraulic tubing as an example, the operation method of the pillar safety over the point in the pressure of the present invention can include the following steps:

[0048] The "light pipe" state is in replacing the anti-top trick and fixed anti-top kava to the vicinity of the lower pressure tube to "neutral", and all the kaowa switch status is: fixed The anti-top tricks are closed, moving anti-top tricks, mobile load bezers and fixed load cards are in turn on. The lift is up to the high point, turn off the moving load-bearing Kawa, and make the mobile load-bearing katri-strength, turn off the moving anti-top Kava, lower the mobile anti-top card, turn on the fixed anti-top kara; The lift is down to the low point, turn off the fixed anti-top kava, and make the fixed anti-top card to the power, turn on the mobile anti-top kava, turn off the fixed load card, lower the fixed load card, turn on the movement Under the load-bearing trick; the lift is up...

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Abstract

The invention provides an operation method for safely passing through a neutral point during tripping of a string in an under-pressure operation process. An under-pressure operation machine used for under-pressure operation comprises a movable anti-jacking slip, a fixed anti-jacking slip, a movable bearing slip and a fixed bearing slip which are all Cavins slips and are sequentially arranged fromtop to bottom. The operation method comprises the following steps that when the string is lifted under pressure to reach the near neutral point, the pair of anti-jacking slips and the pair of bearingslips are kept in a closed state all the time until the string is lifted under pressure to cross the near neutral point. The method has the beneficial effects that personal injury, equipment damage and great well control risks caused by the risk that the string is ejected upwards and flies out or falls into a well are avoided.

Description

Technical field [0001] The present invention relates to the technical field of hydraulic operation in the drilling of the oil and gas field, and in particular, to a method of operating the pillar safety over a patching operation. Background technique [0002] At present, the pressure of "light pipe column" is used to use mobile anti-top tricks and fixed anti-top kava to use mobile, "neutralization point", "neutralization point", using mobile anti-top karaoke, mobile Under the load-bearing truck and fixed anti-top kara, the switch control tube is inserted or the "heavy pipe column" state is in a moving load-bearing truck and fixed load-bearing kaisa alternately switch control tube. [0003] Because Cavins Kava reverse clamping force is only 2 tube columns (about 140kg), existing operating methods do not adapt to Cavins Kawa safe "neutralization", if the "neutralization" theoretical calculation and actual errors are large It may cause the top of the tube column or the risk of the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B19/10E21B19/08E21B19/00
CPCE21B19/10E21B19/08E21B19/00
Inventor 徐煜东郑波袁健曾小军陈曦张平潘登黄船谢胜王灏
Owner BC P INC CHINA NAT PETROLEUM CORP