CN201420528Y

CN201420528Y - Squeeze cement bridge plug

Info

Publication number: CN201420528Y
Application number: CN2009200144093U
Authority: CN
Inventors: 舒明锁; 刘长志; 李影; 李长河; 眭纯华; 刘震
Original assignee: FUXIN CHIYU PETROLEUM MACHINERY Co Ltd
Current assignee: FUXIN CHIYU PETROLEUM MACHINERY Co Ltd
Priority date: 2009-06-08
Filing date: 2009-06-08
Publication date: 2010-03-10
Anticipated expiration: 2019-06-08

Abstract

The utility model belongs to an oil field downhole squeeze cement tool, and particularly relates to a squeeze cement bridge plug which comprises an upper joint (1), a jacket (2), a fishing head (3), acenter rod (4), a central tube (5), a lining (6), an upper and a lower cone (8 and 11), a slip cover (9), a slip (10), a locking spring (15), a fixture block (16), a lower piston (22), a deblocking pin (17), a rubber cylinder shaft (18), springs I and II (19 and 25), steel balls I and II (20 and 23) and the like; wherein an extraction unlocking sleeve (7) is arranged between the fishing head (3)and the slip cover (9) outside the lining (6), and the lower end of the extracting sleeve is connected with the upper cone (8); and a locking sleeve (12) is postioned outside the lower cone (11) and the lower piston (22), and the lower end of the locking sleeve (12) is connected with the upper end of a rubber cylinder (24); after being squeezed by the tool, cement does not reversely overflow; andfurthermore, a tubular column can be safely lifted, the deblocking is thoroughly carried out, and the squeeze cement bridge plug is safe and reliable.

Description

The squeeze method bridging plug

Technical field

The utility model belongs to down-hole, oil field squeeze method instrument, particularly a kind of squeeze method bridging plug.

Technical background

At present, the oil field, home and abroad use hydraulic setting, on carry the squeeze method bridging plug of deblocking, it is anti-excessive to occur cement after having squeezed cement, tubing string is theed cement solidifies can not carried.Instrument uses the back deblocking unreliable, and fishing success ratio is low, is subjected to great limitation during use.

Summary of the invention

The purpose of this utility model is to overcome above-mentioned technical deficiency, provide a kind of tool operation to finish after, tubing string can propose smoothly, the instrument deblocking is the squeeze method bridging plug completely.

The technical scheme that the utility model technical solution problem adopts is: the squeeze method bridging plug comprises: top connection, sheath, fishing head, center-pole, central tube, lining, upper/lower cone, slips cover, slips, snap, fixture block, lower piston, deblocking pin, packing element axle, spring one, two, steel ball one, two, ball seat one, two, packing element, following pressure ring, being characterized in adorning between lining outside fishing head and slips cover one carries and overcoming difficulties, its lower end is connected with upper cone, adorn a locking cover at lower cone and lower piston outside, locking cover lower end connects the packing element upper end.

The beneficial effects of the utility model are: instrument does not instead overflow after having squeezed cement, puies forward safety on the tubing string, and deblocking is thorough, and is safe and reliable.

Description of drawings

Specify with embodiment below in conjunction with accompanying drawing.

Fig. 1 is the structure sectional view of squeeze method bridging plug.

Among the figure, the 1-top connection; The 2-sheath; The 3-fishing head; The 4-center-pole; The 5-central tube; The 6-lining; 7-carries and overcoming difficulties; The 8-upper cone; 9-slips cover; The 10-slips; 10-1-slips spring; The 11-lower cone; 12-locks cover; 13-snap seat; The 14-clamping block; The 15-snap; The 16-fixture block; 17-deblocking pin; 18-packing element axle; 19-spring one; 20-steel ball one; 21-ball seat one; The 22-lower piston; 23-steel ball two; The 24-packing element; 25-spring two; Pressure ring under the 26-; 27-ball seat two;

The specific embodiment

Embodiment, with reference to accompanying drawing, top connection 1 connects oil pipe, and internal thread connects center-pole 4, and external screw thread connects sheath 2, is combined into by these three parts and gives up.Fishing head 3 upper ends are concordant with sheath 2, and the lower end links to each other with lining 6.Carry 7 lower ends of overcoming difficulties and be connected with upper cone 8, upper cone 8 is contained in the slips cover 9 with lower cone 11, and there is slips 10 in the cone outside, be provided with spring 10-1 in the middle of the slips 10, locking cover 12 is in the outside of lower cone 11, in snap seat 13 is housed, snap seat 13 usefulness clamping blocks 14 are fixed on the lower cone 11.Lower piston 22 and snap 15, fixture block 16 is fixed together lower cone 11 and center-pole 4.Spring 1, steel ball 1 and ball seat 1 form one way valve in the lower end of center-pole 4.Packing element 24 is in the outside of packing element axle 18, the lower end pressure ring 26 that is threaded down, and the inside steel ball 2 23, spring 2 25 and ball seat 2 27 form the anti-valve of telling, and deblocking pin 17 is fixed together central tube 5 and its.

The process that sets of squeeze method bridging plug is as follows: instrument is gone into the well behind the precalculated position; water filling pressurization in oil pipe; when pressure reaches 5MPa; the protection shear pin is cut off; lower piston 22 is walked downwards; fixture block 16 is told out, and makes lower cone 11 and center-pole 4 separately, exercises slips 10 on the lower cone 11 and opens the grappling sleeve pipe; lower piston 22 drives locking cover 12 downward walking compression packing elements 24 Sealed casing pipes after going downwards to the shoulder that locks cover 12; snap 15 is locked with locking cover 12 simultaneously, and when pressure reached 20Mpa, the seat envelope was finished; (the top connection 1 of giving up simultaneously; sheath 2 and center-pole 4) protection mechanism opens, and the upper lifting pipe post proposes to give up.

Squeeze method: be lowered to intubate 28, intubate and instrument inner chamber form sealing, and to oil pipe inner chamber squeeze method, cement is opened the anti-valve of telling that is formed by steel ball 23 and spring 25 through the intubate inner chamber, enters instrument lower floor.

Lift pipe string: after crowded ash is finished, fixed tubular column, first anti-flushing well is cleaned instrument inner chamber and instrument outward, upper lifting pipe post again, intubate is separated with instrument, and big again discharge capacity is just being washed or backwash, makes in the oil pipe cement clean.

Salvage: following special-purpose fishing tool docks with the instrument fishing head, on carry the 6-8 ton deblocking shear pin 17 broken, clamping block 14 sinks snap seat 13 and snap 15 are separated, lose locking action, packing element 24 resiliences, slips 14 reclaims, downhole tool is proposed, as carry motionless can on carry 15 tons, break safety collar, the proposition instrument.

Claims

1, a kind of squeeze method bridging plug, comprise top connection (1), sheath (2), fishing head (3), center-pole (4), central tube (5), lining (6), on, lower cone (8,11), slips cover (9), slips (10), snap (15), fixture block (16), lower piston (22), deblocking pin (17), packing element axle (18), spring one, two (19,25), steel ball one, two (20,23), ball seat one, (21,27), packing element (24), following pressure ring (26), it is characterized in that adorning one between lining (6) outside fishing head (3) and slips cover (9) carries overcome difficulties (7), its lower end is connected with upper cone (8), adorn a locking cover (12) at lower cone (11) and lower piston (22) outside, locking cover (12) lower end connects packing element (24) upper end.