CN203271668U - Horizontal well dragging and fracturing high-pressure packer - Google Patents

Abstract

The utility model belongs to oil exploitation equipment, and particularly relates to a horizontal well dragging and fracturing high-pressure packer. The high-pressure packer comprises a central tube (1), a back cap (2), dowels (4) and a rubber sleeve (7), wherein the rubber sleeve (7) with a lug boss in the middle is fixed at the middle part of the periphery of the central tube (1) of the packer; an inner pressure bearing ring (5) of which the axial section is L-shaped is connected to the peripheries of the upper end and the lower end of the lug boss of the rubber sleeve (7); an outer pressure bearing ring (6) with a knife-shaped axial section matched with the L-shaped axial section of the inner pressure bearing ring (5) is connected to the periphery of the inner pressure bearing ring (5); a plurality of inner pressure bearing ring axial grooves (5-1) and a plurality of outer pressure bearing ring axial grooves (6-1) are formed from the bottoms to the middle-upper parts of the circumferential walls of the inner pressure bearing ring (5) and the outer pressure bearing ring (6) at intervals in the axial direction; the inner pressure bearing ring (5), the outer pressure bearing ring (6), the inner pressure bearing ring axial grooves (5-1) and the outer pressure bearing ring axial grooves (6-1) are mounted in a pressure ring (3) in a staggered manner and are positioned by the dowels (4). The high-pressure packer has the advantages of good sealing performance, long service life, safety and reliability.

Description

Horizontal well drag fracturing high-pressure packer

Technical field

The utility model belongs to oil exploration equipment, particularly a kind of horizontal well drag fracturing high-pressure packer.

Background technology

At present, horizontal well drag fracturing technique is had higher requirement to technical indicator and the performance of drag fracturing packer, the poor 80Mpa of resistance to compression, 120 ℃ of heatproofs are completed 10 sections of pressure break hop counts, after pressure break is completed removing seal for packer thoroughly, drag smoothly.Packer now used is made of central tube, back of the body cap, pressure ring, packing element, in order to guarantee to be lowered to smoothly in pit shaft, the packer maximum outside diameter must be less than the pit shaft internal diameter, after packer set, the change of packing element diameter is close to greatly and forms sealing on shaft in wall, after the end thrust that the well liquid that is closed produces packing element was elevated to certain value, packing element can produce axial flow along sealed spacer and cause at last seal failure.So both affect the application life of packer, affected simultaneously the production of oil well.

Summary of the invention

The purpose of this utility model is to overcome above-mentioned technical deficiency, provide a kind of simple in structure, setting effective, can extend the packer horizontal well drag fracturing high-pressure packer in application life.

the technical scheme that the utility model technical solution problem adopts is: horizontal well drag fracturing high-pressure packer comprises central tube, back of the body cap, pin, packing element, be characterized in the middle part fixedly being housed with the packing element of circular bosses at the middle place, central tube periphery of packer, upper at packing element boss place, it is L shaped interior bearing ring that axial cross section is equipped with in the peripheral connection in lower two ends, in the connection of the periphery of interior bearing ring, the axial cross section that coincide with interior bearing ring L profile being housed is the outer bearing ring of knife-edge, on the circle wall of interior bearing ring and outer bearing ring from the bottom to the position, middle and upper part vertically all apart from opening bearing ring axial groove and outer bearing ring axial groove in several, interior bearing ring, outer bearing ring becomes intervening portion to be arranged in pressure ring and with pin with interior bearing ring axial groove with outer bearing ring axial groove to locate.

The beneficial effects of the utility model are: horizontal well drag fracturing high-pressure packer is the packing element elastic deformation when voltage rise is high in central tube, promote simultaneously inside and outside bearing ring diameter change and be close to greatly formation sealing on shaft in wall, after end thrust is raised to certain value, the inner bearing ring of packing element and outer bearing ring elastic deformation diameter become large and sleeve pipe sturdy, realize setting, make the good seal performance of packer, long service life, safe and reliable.

Description of drawings

Illustrate with embodiment below in conjunction with accompanying drawing.

Fig. 1 is horizontal well drag fracturing high-pressure packer structure half sectional view.

Fig. 2 is the A-A cutaway view Amplified image of Fig. 1.

In figure, the 1-central tube; 2-carries on the back cap; The 3-pressure ring; 3-1-pressure ring boss; The 4-pin; Bearing ring in 5-; Bearing ring axial groove in 5-1-; The outer bearing ring of 6-; The outer bearing ring axial groove of 6-1-; The 7-packing element.

The specific embodiment

Embodiment, with reference to accompanying drawing 1,2, horizontal well drag fracturing high-pressure packer is the middle part fixedly to be housed with the packing element 7 of circular bosses in the periphery, middle part of central tube 1, in the peripheral connection of boss place's upper/lower terminal of packing element 7, axial cross section being housed is L shaped interior bearing ring 5, connect in the periphery of interior bearing ring 5 that the axial cross section that coincide with interior bearing ring 5 L profiles is housed is the outer bearing ring 6 of knife-edge, on the circle wall of interior bearing ring 5 and outer bearing ring 6 from the bottom to upper position vertically all apart from opening 12 interior bearing ring axial groove 5-1 and outer bearing ring axial groove 6-1.Interior bearing ring 5, outer bearing ring 6 become intervening portion to be arranged in pressure ring 3 with interior bearing ring axial groove 5-1 with outer bearing ring axial groove 6-1, and locate with pin 4.Be threaded with central tube 1 with back of the body cap 2 in the outer face of pressure ring 3 pressure ring 3 is fixed.On the outer circumference surface of pressure ring 3 all apart from establishing several pressure ring boss 3-1.

The course of work of horizontal well drag fracturing high-pressure packer is: after the interior liquid filling pressure of central tube 1 raises, packing element 7 elastic deformation diameters swell, promote simultaneously staggeredly to be sleeved on packing element 7 external diameters, the interior bearing ring 5 in pressure ring 3 endoporus and outer bearing ring 6 elastic deformation diameters become large and sleeve pipe is sturdy, realize setting.After the end thrust that the well liquid that is closed produces packing element 7 was elevated to certain value, packing element 7 stopped by interior bearing ring 5 and outer bearing ring 6 along the axial flow trend that sealed spacer produces, so packing element 7 damage of can not outflowing, and kept sealing performance.After central tube 1 internal drop was low, packing element 7 is elastical retraction at first, interior bearing ring 5 and outer bearing ring 6 lose packing element 7 support after, internal surface of sleeve pipe is left in resilience under self elastic reaction, reaches removing seal for packer thorough, drags purpose smoothly.

Claims (1)

1. horizontal well drag fracturing high-pressure packer, comprise central tube (1), back of the body cap (2), pin (4), packing element (7), it is characterized in that central tube (1) at packer peripheral in the middle of the place fixedly be equipped with in the middle part of with the packing element (7) of circular bosses, upper at packing element (7) boss place, it is L shaped interior bearing ring (5) that axial cross section is equipped with in the peripheral connection in lower two ends, in the connection of the periphery of interior bearing ring (5), the axial cross section that coincide with interior bearing ring (5) L profile being housed is the outer bearing ring (6) of knife-edge, on the circle wall of interior bearing ring (5) and outer bearing ring (6) from the bottom to the position, middle and upper part vertically all apart from opening bearing ring axial groove (5-1) and outer bearing ring axial groove (6-1) in several, interior bearing ring (5), outer bearing ring (6) becomes intervening portion to be arranged in pressure ring (3) and uses pin (4) to locate with outer bearing ring axial groove (6-1) with interior bearing ring axial groove (5-1).

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