CN105696964A

CN105696964A - Blowout prevention protection packer

Info

Publication number: CN105696964A
Application number: CN201510624831.0A
Authority: CN
Inventors: 梁伟成; 梁闯
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-09-28
Filing date: 2015-09-28
Publication date: 2016-06-22

Abstract

The invention relates to a blowout prevention protection packer, which comprises a blowout prevention working barrel, a blowout prevention working barrel joint, a plugging device and a blowout prevention packer, and is characterized in that the lower end surface of the blowout prevention working barrel joint is provided with a stop opening; a blowout prevention piston is assembled in the blowout prevention working barrel; the blowout prevention piston is axially fixed through pressure release pins arranged on the blowout prevention working barrel; liquid outlet holes are formed in the blowout prevention working barrel; O-shaped rubber rings are arranged between the blowout prevention piston and the blowout prevention working barrel; an annular groove is formed in the outer wall of the blowout prevention piston; liquid inlet holes are formed in the wall surface of the inner side of the annular groove; the lower end of the plugging device is connected with a sealing joint through screw threads; and the lower end of the sealing joint is in a paraboloid shape or a pyramid shape. The blowout prevention protection packer is used as a primary packer; the upper end of the blowout prevention protection packer is connected with an oil pipe; the lower end of the blowout prevention protection packer is connected with the existing ordinary packer; after entering a well, the blowout prevention protection packer has all functions such as setting, well flushing and deblocking of the ordinary packer, and also has the functions of blowout prevention and pressure relief; the pressure in a pipe column below a blowout prevention mechanism is maintained to be relatively stable; the potential safety hazards are eliminated; and the green and environment-friendly operation is ensured.

Description

Blowout prevention protecting packer

Technical field

The present invention relates to the production equipment of a kind of producing well, particularly a kind of blowout prevention protecting packer。

Background technology

Current oil field is many oil-producings, usually adopts the process of displacement of reservoir oil by filling water, it is simply that for displacement of reservoir oil by filling water in selected stratum。Therefore with well by oil well, and water borehole pressure is generally higher than oil well, when causing each workover treatment, a large amount of oil mixing with water liquid ejection well head, cause environmental pollution and substantial amounts of economic loss, therefore well inherence adds on the basis rushing down oil equipment, also need to increase oil proof equipment。Existing blowout prevention method is to throw in dead mouthpiece in oil pipe, blocks oil pipe, it is prevented that oil water mixture ejection well head。But because the structure problem of the production mandrel used and blanking plug causes sealing property to reduce, will also result in overpressure while blocking oil pipe to continue to raise, blanking plug or oil pipe is made to scurry out well head, thus causing that liquid in pipe vomits, not only can not reach the effect of blowout prevention, pollute environment on the contrary greatly or cause personal injury。

Packer is that oil field is for the requisite downhole tool of formation testing, oil recovery, water filling and oil formation improvement。Traditional packer only has the effect of oil-separating layer, when well workover, need to downhole tool and packer be proposed one by one, in order to the intrinsic pressure power of pre-preventing oil pipe excessive time oil water mixture is overflowed well head, it is necessary to packer top increase draining equipment, to reach environmental protection purpose；But this input not only adding equipment and operating cost, also add the difficulty of operation。And along with the increase of draining and blowout control equipment, cause cost for oil production to rise, and with more accident potential, strengthen the difficulty fixed a breakdown simultaneously, increase workover treatment number of times, workover treatment time。

Summary of the invention

It is an object of the invention to provide a kind of blowout prevention protecting packer, it is achieved blowout prevention function, and pressure in the tubing string of below anti-spraying mechanism can be kept relatively stable, get rid of potential safety hazard, it is ensured that environmental protection operation。

Technical scheme provided by the invention is as follows: include blowout prevention seating nipple, blowout prevention seating nipple joint, blanking plug and blowout prevention packer, it is characterised in that: the lower surface of blowout prevention seating nipple joint is seam；Assembling blowout prevention piston in blowout prevention seating nipple, by two pressure release pins circumferentially symmetrical on blowout prevention seating nipple by blowout prevention piston axial restraint, is provided with two circumferentially uniform liquid outlets on blowout prevention seating nipple；Liquid outlet is positioned at and becomes on the circumferential position in 90 degree of directions with pressure release pin, arranges three groups of O type cushion rubbers between blowout prevention piston and blowout prevention seating nipple；The outer wall of blowout prevention piston arranges cannelure, the wall inside cannelure is provided with two circumferentially symmetrical inlet openings；The lower end seal with screwed joint joint of blanking plug, the lower end of seal nipple is parabolic shape or pyramid type。

The effect of the present invention: this blowout prevention protecting packer uses as first order packer; upper end is connected with oil pipe; lower end connects existing common packer; after going into the well, this blowout prevention protecting packer not only has all functions of common packer; as set, well-flushing, decapsulation functions, also there is blowout prevention, decompression function, and pressure in the tubing string of below anti-spraying mechanism can be kept relatively stable; get rid of potential safety hazard, it is ensured that environmental protection operation。

Accompanying drawing explanation

Fig. 1 is present configuration schematic diagram。

Fig. 2 is the close-up schematic view of Fig. 1。

Fig. 3 is the sectional view in the A-A direction of Fig. 1。

Detailed description of the invention

See Fig. 1-3, adopt prior art to assemble following structure: blowout prevention seating nipple joint 1 upper end is provided with the Taper Pipe female thread being connected with oil pipe；Blowout prevention seating nipple joint 1 lower end and blowout prevention seating nipple 4 are threaded connection and by O type rubber sealing, the lower end of blowout prevention seating nipple 4 is threaded connection the top connection 5 of packer 6, and packer 6 adopts prior art construction。The technical pattern improved is as follows: the lower surface of blowout prevention seating nipple joint 1 is seam；Assembling blowout prevention piston 2 in blowout prevention seating nipple 4, by two pressure release pins 3 circumferentially symmetrical on blowout prevention seating nipple 4 by blowout prevention piston 2 axial restraint, is shown in Fig. 3, is provided with two circumferentially uniform liquid outlet B on blowout prevention seating nipple 4；Liquid outlet B is positioned at and on the circumferential position in 3 one-tenth 90 degree of directions of pressure release pin, arranges three groups of O type cushion rubber E, F and D, often organize twice between blowout prevention piston 2 and blowout prevention seating nipple 4；When blowout prevention piston 2 is positioned at blowout prevention seating nipple 4 internal upper part, O type cushion rubber E, F are positioned at the both sides of blowout prevention seating nipple 4 liquid outlet B so that liquid outlet B seals；The outer wall of blowout prevention piston 2 arranges cannelure G, the wall inside cannelure G is provided with two circumferentially symmetrical inlet openings C, O type cushion rubber D, E inlet opening C and cannelure G is sealed；Blanking plug 7 is assembled in blowout prevention seating nipple joint 1 and blowout prevention piston 2, and the lower end seal with screwed joint joint 8 of blanking plug 7, the lower end of seal nipple 8 is parabolic shape or pyramid type, has guide effect。

Operation principle

This blowout prevention protecting packer uses as first order packer, and upper end is connected with oil pipe, and lower end connects existing common packer。Before workover rig service to oil well lift pipe string, the present invention plays blowout prevention function。Suppress in oil pipe, when pressure reaches certain numerical value, cut off pressure release pin 3, the descending certain distance of blowout prevention piston 2 so that inlet opening C and cannelure G connects with liquid outlet B, it is achieved decompression function。

Claims

1. a blowout prevention protecting packer, including blowout prevention seating nipple, blowout prevention seating nipple joint, blanking plug with take over control spray packer, it is characterised in that: the lower surface of blowout prevention seating nipple joint is seam；Assembling blowout prevention piston in blowout prevention seating nipple, by two pressure release pins circumferentially symmetrical on blowout prevention seating nipple by blowout prevention piston axial restraint, is provided with two circumferentially uniform liquid outlets on blowout prevention seating nipple；Liquid outlet is positioned at and becomes on the circumferential position in 90 degree of directions with pressure release pin, arranges three groups of O type cushion rubbers between blowout prevention piston and blowout prevention seating nipple；The outer wall of blowout prevention piston arranges cannelure, the wall inside cannelure is provided with two circumferentially symmetrical inlet openings；The lower end seal with screwed joint joint of blanking plug, the lower end of seal nipple is parabolic shape or pyramid type。