CN201420527Y - Staged fracturing bridge plug - Google Patents

Abstract

The utility model relates to an oilfield downhole fracturing string supportive tool, in particular to a staged fracturing bridge plug, which comprises an upper joint (1), a central tube (2), an uppercompression ring and a lower compression ring (5, 8), a rubber tube (6), a rubber tube shaft (7), an upper cone and a lower cone (9, 12), a slip cover (10), a slip (11), an upper piston and a lower piston (13, 16) and the like. A release shearing ring (3) is installed between the upper compression ring (5) and the central tube (2) at the right end of the upper joint (1) and the left end of the rubber tube shaft (7). The release shearing ring (3) is fixed with the upper compression ring (5) by using a release pin (4). A settling pin (15) is used to block an upper fixture block (14). The right end of a cylinder tube (21) is fixed with the central tube (2) by using an unsetting pin (22). A multi-stage fracturing string can be multi-staged connected with the bridge plug to realize one-time string downhole multi-layer fracturing. The unsetting force is not accumulated and is small to ensure that the tool can be fully lifted out after the completion of the fracturing.

Description

The classification press-fracturing bridge plug

Technical field

The utility model belongs to oil field underground fracture tubing string kit, particularly a kind of classification press-fracturing bridge plug.

Background technology

At present, the multilayer partial pressure processes is adopted in home and abroad oilfield exploitation, fracturing string adopts multiple-string packer with each fractured interval separately, adopts order separate stratum fracfturing successively from down to up, and a tubing string is gone into the well and finished the multilayer dividing potential drop, duty cycle is short, operating cost is low, but has two problems, and the one, while deblocking during lift pipe string, deblocking power height, packer is difficult for tripping out; The 2nd, if certain layer is when sand card phenomenon occurring, whole tubing string rises motionless, causes the overhaul accident when lift pipe string.

Summary of the invention

The purpose of this utility model is to overcome above-mentioned technical deficiency, the classification press-fracturing bridge plug that provides a kind of and can realize that multilayer dividing potential drop, deblocking are reliable, instrument can be tripped out after the pressure break.

The technical scheme that the utility model technical solution problem adopts is: the classification press-fracturing bridge plug comprises top connection, central tube, upper and lower pressure ring, packing element, packing element axle, upper/lower cone, slips cover, slips, upper and lower piston, upper and lower fixture block, pawl spring, snap seat, snap, cylinder barrel, be characterized in adorning the shearing ring of giving up between the upper press ring of top connection right-hand member, packing element axle left end and central tube, the shearing ring of giving up is fixed with give up pin and upper press ring; Seal fixture block with setting pin; Cylinder barrel right-hand member head is fixed with deblocking pin and central tube.

The beneficial effects of the utility model are: multistage dividing potential drop tubing string can this bridging plug of multistage connection, realizes tubing string multilayer dividing potential drop of going into the well; Upper lifting pipe post after the pressure break, higher level's bridging plug is deblocking at first, and higher level's bridging plug is separated and is honored as a queen, and upper lifting force reaches subordinate's bridging plug, subordinate's bridging plug deblocking, gradually deblocking to tubing string all proposes, and deblocking power does not add up, and deblocking power is low.If certain one-level bridging plug sand card can propose this grade bridging plug central tube earlier, carry out post-processed again, guarantee instrument all to be tripped out after pressure break is finished.

Description of drawings

Specify with embodiment below in conjunction with accompanying drawing.

Fig. 1 is the structure sectional view of classification press-fracturing bridge plug.

Among the figure, the 1-top connection; The 2-central tube; The 3-shearing ring of giving up; The 4-pin of giving up; The 5-upper press ring; The 6-packing element; 7-packing element axle; Pressure ring under the 8-; The 9-upper cone; 10-slips cover; The 11-slips; The 12-lower cone; The 13-upper piston; The last fixture block of 14-; 15-sets pin; The 16-lower piston; Fixture block under the 17-; The 18-pawl spring; 19-snap seat; The 20-snap; The 21-cylinder barrel; 22-deblocking pin; The 23-spring;

The specific embodiment

Embodiment, with reference to accompanying drawing, top connection 1 connects oil pipe, external screw thread connects upper press ring 5, internal thread connects central tube 2, the shearing ring 3 of giving up is equipped with in central tube 2 outer ends, upper press ring 5 the insides are equipped with shearing ring and are connected with the pin 4 of giving up, be threaded with packing element axle 7, packing element 6 is housed on the packing element axle 7, upper cone 12 pressure ring 8 that is threaded down, upper cone 9 is contained in the slips cover 10 with lower cone 12, there is slips 11 in the cone outside, is provided with spring 23 in the middle of the slips 11, and lower cone 12 external screw threads connect cylinder barrel 21, upper piston 13 and lower piston 16 are housed in the cylinder barrel 21, lower piston 16 utilizations are gone up fixture block 14 and are pushed down upper piston 13, and are fixed together with setting pin 15, and fixture block 17 is pushed down central tube 2 under utilizing simultaneously, pawl spring 18 is connected with central tube 2 internal threads, be connected with snap seat 19 external screw threads, snap 20 is housed on the snap seat 19, cylinder barrel 21 is fixing with central tube 2 usefulness deblocking pins 22.

The process that sets of classification press-fracturing bridge plug is as follows: water filling pressurization in oil pipe, when pressure reaches 4MPa, setting pin 15 cuts off, upper and lower fixture block 14,17 spues, lower piston 16 drives pawl spring 18, snap seat 19 is descending, while snap 20 step lock, drive packing element axle 7, pressure ring 8, the shearing ring 3 of giving up, upper cone 9 are descending down, slips 11 is swelled, and the grappling internal surface of sleeve pipe continues pressurization, with slips 11 and upper/lower cone 9,12 is support, packing element axle 7 continues right lateral with packing element 6 compressions, forms sealing, and packing element 6 sets and finishes when pressure reaches 30MPa.

During deblocking, the upper lifting pipe post, topmost bridging plug is at first stressed, top connection 1 is passed to power on the central tube 2, and deblocking pin 22 is broken, and it is up to drive central tube 2, pawl spring 18 loses support, snap 20 lost efficacy, and central tube 2 upper shoulders are suspended on the shearing ring 4 of giving up, and shearing ring 4 passes to power on the upper press ring 5, it is up that upper press ring 5 drives packing element axle 7, packing element 5 resiliences, power are delivered on each part successively, till the bridging plug deblocking of whole the top.Power continues to be delivered on the next stage tubing string by cylinder barrel 21, until whole tubing string deblocking.If certain one-level tubing string sand card, on when carrying central tube 2 upper shoulders can break shear pin on the shearing ring 4 of giving up, top connection 1, shearing ring 4 propose earlier with central tube 2, this tubing string and put aside with lower packet, are salvaged by fishing tool down again.

Claims (1)

1, a kind of classification press-fracturing bridge plug, comprise top connection (1), central tube (2), on, following pressure ring (5,8), packing element (6), packing element axle (7), on, lower cone (9,12), slips cover (10), slips (11), on, lower piston (13,16), on, following fixture block (14,17), pawl spring (18), snap seat (19), snap (20), cylinder barrel (21), it is characterized in that at top connection (1) right-hand member, adorn the shearing ring of giving up (3) between the upper press ring (5) of packing element axle (7) left end and the central tube (2), the shearing ring of giving up (3) is fixing with pin of giving up (4) and upper press ring (5); Seal fixture block (14) with setting pin (15); Cylinder barrel (21) right-hand member head is fixing with deblocking pin (22) and central tube (2).

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