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Split dynamic depressurization device for oil gas well

A depressurizing device and a split-type technology, which are used in the production of fluids, flushing wellbore, wellbore/well components, etc., can solve the problems of reducing the permeability of the compacted zone near the perforation, and achieve the effect of improving the permeability.

Active Publication Date: 2011-03-30
DAQING OILFIELD CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the process of perforating and creating fractures, the perforating bullets crush the rock particles in the formation at the same time, and the migration of the broken rock particles will greatly reduce the permeability of the compacted zone near the perforation tunnel.

Method used

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  • Split dynamic depressurization device for oil gas well
  • Split dynamic depressurization device for oil gas well
  • Split dynamic depressurization device for oil gas well

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with accompanying drawing.

[0033] Figure 8 It is a structural schematic diagram of the present invention, as shown in the figure, the split-type dynamic decompression device for oil and gas wells is assembled sequentially from a main joint, several auxiliary joints, several pressure relief chambers 3 and a lower joint 4, wherein Auxiliary joints and pressure relief chambers are connected alternately.

[0034] The main joint includes an upper joint 10 and a main striking rod 20;

[0035] Wherein the structure and shape of the upper joint 10 are as figure 1 Shown is a cylindrical shape with upper and lower openings, and the hollow part inside the cylinder is a three-stage cylindrical shape from top to bottom. Figure 8 As shown, the diameter of the first-stage cylindrical hole 11 corresponds to the diameter of the head 21 of the main striking rod 20, the diameter of the second-stage cylindrical hol...

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Abstract

The invention provides a split dynamic depressurization device for an oil gas well. The device comprises a main joint, a plurality of auxiliary joints, a plurality of pressure relieving cavities (80) and a lower joint (90) which are sequentially assembled, wherein the auxiliary joints are alternately connected with the pressure relieving cavities; the main joint comprises an upper joint (10) and a main striking rod (20); and each auxiliary joint comprises a tapping middle joint (30), a piston (40), a shearing ring (50), a shearing pin (51), an auxiliary striking rod (60) and a correcting disk(70). In the invention, the detonation pressure of a widowmaker pushes the pistons to move, and side through holes on the widowmaker are aligned with the side through holes of the tapping middle joints and internally and externally communicated; and liquid in a shaft enters the pressure relieving cavities through the through holes to ensure that the pressure in the shaft is instantaneously reduced so as to realize dynamic negative pressure, thereby the permeability of a compacted zone in a near perforation duct area is further improved.

Description

Technical field: [0001] The invention relates to a pressure-reducing device used in conjunction with perforation and completion operations of oil and gas wells in the technical field of oilfield perforation technology. Background technique: [0002] Cased wells in oilfields must be perforated before fluids can flow from or be injected into the formation. During the process of perforating and creating fractures, the perforating bullets crush the rock particles in the formation at the same time, and the migration of the broken rock particles will greatly reduce the permeability of the compacted zone near the perforation tunnel. In order to reduce the pollution caused by rock debris and explosive residues to perforation and improve the perforation effect, negative pressure perforation technology is often used in oil fields to reduce the damage caused by perforation. [0003] Negative pressure perforating technology artificially establishes a static pressure difference between ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B21/08E21B43/11
Inventor 蔡山于开勋刘桥郭景学康柒虎王军
Owner DAQING OILFIELD CO LTD
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