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Accelerated falling pitching ball sphere and method for realizing acceleration of ball falling

A ball and pitching technology, which is applied in the fields of fluid production, earth-moving drilling, wellbore/well valve device, etc., can solve problems such as increasing time cost, and achieve the effect of reducing time cost, improving falling speed and low cost.

Active Publication Date: 2019-03-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the design position is deep underground, it will take a long time to reach the design position in the wellbore after throwing the ball, which will increase the time cost

Method used

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  • Accelerated falling pitching ball sphere and method for realizing acceleration of ball falling
  • Accelerated falling pitching ball sphere and method for realizing acceleration of ball falling

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Effect test

example 1

[0041] When the acceleration method of the present invention is applied in a vertical well, the diameter of the smallest wellbore is 5.5 inches, so the diameter of the sphere can be designed to be 80mm. The internal and external pressure difference (the difference between the internal pressure and the external pressure) without pressure release, deformation or rupture. A hole is opened at the top of the center of the inner cavity, combined with the inner cavity wall to form a conical nozzle with an outer expansion angle of 45°, and the diameter of the hole on the outer surface of the ball is 8mm.

[0042] After injecting liquid nitrogen into the wellhead, seal the cavity well, and set the rupture pressure difference of the explosion-proof safety plate to 5MPa (the specific value of the pressure difference is determined according to the approximate internal and external pressure difference required for the rupture of different well depths. Different wells are Not the same. On t...

example 2

[0044] Apply the acceleration method of the present invention in vertical wells, the smallest shaft diameter is 5.5 inches, so the designed sphere diameter is set to 80mm, the sphere is selected from aluminum metal, and the wall thickness of the sphere inner cavity is 5mm, enough to ensure that the cavity shell will be able to withstand a certain The difference between internal and external pressure (internal pressure minus external pressure) without pressure release, deformation or rupture. A hole is opened at the top of the center of the inner cavity, combined with the inner cavity wall to form a conical nozzle with an outward expansion angle of 45°, and the diameter of the hole on the outer surface of the sphere is 8mm.

[0045] After pouring liquid nitrogen into the wellhead, seal the cavity well, set the explosion-proof safety plate with a rupture pressure difference of 3MPa, put it in from the wellhead, and the solid half of the ball is always at the bottom during the pro...

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Abstract

The invention provides an accelerated falling pitching ball sphere and a method for realizing the acceleration of ball falling, and belongs to the field of petroleum development. The pitching ball sphere includes a ball body and a hemisphere which are connected into one body and in coaxial line arrangement; the side, away from the hemisphere, at the internal of the ball body is provided with an inner cavity, and the inner cavity and the ball body are in coaxial line arrangement; the top part of the ball body is provided with a hole in coaxial line with the ball body, and the hole can make theinner cavity communicate with the external of the ball body; an explosion-proof safety piece and a nozzle are successively installed in the hole; the explosion-proof safety piece is located between the nozzle and the inner cavity; and the nozzle can hold down the explosion-proof safety piece.

Description

technical field [0001] The invention belongs to the field of petroleum development, and in particular relates to an accelerated falling pitching sphere and a method thereof. Background technique [0002] In recent years, there have been more and more ball-throwing techniques used in the wellbore of the petroleum field. At present, after the ball is thrown, it depends on the gravity of the ball itself to fall, and on the other hand, when conditions permit, the fluid in the pipe string is pumped to drive the ball down. After reaching and stopping at the design position, the subsequent construction can be carried out. If the design position is relatively deep underground, it will take a long time to reach the design position in the wellbore after the ball is thrown, which will increase the time cost. Contents of the invention [0003] The purpose of the present invention is to solve the above-mentioned problems in the prior art, and to provide a throwing ball and method for ...

Claims

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Application Information

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IPC IPC(8): E21B34/06E21B43/26
CPCE21B34/06E21B43/26E21B2200/04
Inventor 张晋凯周仕明陶谦苗霞刘仍光
Owner CHINA PETROLEUM & CHEM CORP