CN101392636A

CN101392636A - Sand prevention water injection packer

Info

Publication number: CN101392636A
Application number: CNA2008101584315A
Authority: CN
Inventors: 胡振明; 温哲豪; 欧连贵
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-10-29
Filing date: 2008-10-29
Publication date: 2009-03-25

Abstract

The invention relates to a sand-prevention water-injection packer for injecting water into a petroleum extracting well. The technical proposal is that the packer consists of an upper joint, a central tube, a pressure cap, a slip telescopic sleeve, an anchor body, a slip, a slip shrink sleeve, a sand blocking cap, a reducer union, a tubing assembly, a sleeve, an O-shaped ring, a flushing valve, a piston, a cylinder, a self-locking tube, a self-locking sleeve, a shear pin and a lower joint which are connected in sequence. The sand blocking cap, a fluke compulsory contraction mechanism, a large flushing channel and a flushing switch are arranged in the sand-prevention water injection packer to block sand which deposits on the upper part of the packer, thereby preventing the sand from entering a cavity inside the packer, avoiding the occurrence of accidents that the water-injection packer is occasionally subjected to sand blocking and well blocking during deblocking so as to reduce accident loss. The packer can fulfill the requirements of normal water injection of a separated injection well and large-discharge reversely flushing. When disanchoring and deblocking are required, a pipe column is lifted to cut off the shear pin, a contracting claw of the slip is compulsorily pulled, pressed and contracted by the slip telescopic sleeve and the slip shrink sleeve to smoothly realize deanchoring, meanwhile, the tubing assembly of the packer is contracted and deblocked.

Description

Sand prevention water injection packer

Technical field

The present invention relates to the downhole tool that a kind of oil exploitation well is used for water filling, especially can sand control, anti-sticking and have a sand prevention water injection packer of big well-flushing passage.

Background technology

For seperated layer water injection and the well-flushing problem that solves water injection well in the oil exploitation, the scientific and technical personnel of oil exploitation industry have successively developed handling and have set formula water injection packer and hydrostatic setting water injection packer, and have developed not releasable flushing formula water injection packer.Though these water injection packers have played seperated layer water injection and the not effect of deblocking well-flushing, but owing to limit by self structure and function, the variation of pressure makes and shakes out in water injection string wriggling, the well and the corrosion of water quality in addition, the generation of card well accident when there are water injection packer sand card and deblocking in the time, especially existing not releasable flushing formula water injection packer well-flushing passage is little, the well-flushing flow does not reach requirement, do not have due well washing effect, also can be directed at the big injury that causes packer of well-flushing resistance for a short time because of the well-flushing passage.Be a big hidden danger of water injection well water injection packer application life, safe deblocking.

Summary of the invention

Take place easily when sand card, deblocking being arranged when overcoming existing water injection packer that card well accident, change of water injection make the water injection string wriggling and the well-flushing passage is little, the well-flushing resistance big and cause deficiency the packer injury, the invention provides a kind of sand prevention water injection packer, be provided with anchor fluke in this sand prevention water injection packer and force contracting mechanism, big well-flushing passage and well-flushing switch, the safe deblocking of water injection packer can not only be guaranteed, the needs of high flow rate washover can also be satisfied.

The technical solution adopted for the present invention to solve the technical problems is: top connection, central tube, pressure cap, slips telescopic, anchor main body, slips, slips shrink cover, sand block cap, reducer union, packing element assembly, sleeve pipe, O shape circle, flushing valve, piston, cylinder barrel, self-locking pipe, connect to form successively from lock tube, shear pin, lower contact.

In the anchor main body, slips, slips telescopic, slips are shunk cover pack into successively; Slips shrinks to apply mechanically and is threaded on the anchor main body; The contraction pawl at slips two ends is respectively charged into the slips telescopic, slips shrinks in the interior circular horn mouth of cover; One end of central tube penetrates from the endoporus that slips shrinks cover, and through the inner arc surface of slips, the endoporus from the slips telescopic penetrates again, with being threaded on the slips telescopic; Form anchor and anchor fluke and force contracting mechanism.The sand block cap is with being threaded on the anchor main body; Behind the reducer union cover upper center tube, with being threaded on the sand block cap; It is crossed liquid bath and is lived by the sand block calotte, forms sand block mechanism.Overlap effective being threaded on the packing element assembly; The packing element assembly is with being threaded in the reducer union; Flushing valve is enclosed within on the central tube after installing O shape circle; Piston installs O shape circle back with being threaded on the central tube; Cylinder barrel is inserted in behind piston, the flushing valve with being threaded on the packing element assembly; And, form packing device, well-flushing passage and well-flushing switching mechanism jointly by the annulus access Φ 2 between mistake liquid bath Φ 1, sleeve pipe and the central tube, mistake liquid bath Φ 3.The self-locking pipe box is on central tube; Shear pin is used and is threaded on the screwed hole of self-locking pipe, and smaller diameter end is inserted in the circular hole of central tube; Respectively with being threaded on self-locking pipe and the cylinder barrel, form self-locking device from lock tube.With being threaded on the central tube, present embodiment is just assembled and is finished respectively for top connection, lower contact.

Like this, when the pressure in the normal water filling central tube 2 raise, pressure just can move upward by the flushing valve 13 that pressure transmission hole Φ 4 promotes packer.Under the promotion of flushing valve 13, pressure cap 3, anchor main body 5, slips 6, slips shrink cover 7, sand block cap 8, reducer union 9, packing element assembly 10, sleeve pipe 11, cylinder barrel 15, also move upward from lock tube 17 thereupon, make anchor grappling, packer setting and self-locking device locked.Simultaneously, flushing valve 13 is closed annulus access Φ 2, finishes disposable grappling, sets and the self-locking process.When anti-flushing well and since sleeve pipe in pressure greater than the pressure in the oil pipe, flushing valve 13 just can be pushed and move downward, and annulus access Φ 2 is opened.Flushing fluid flow into the packer bottom by packer top, and returns ground by oil pipe by liquid bath Φ 1 sleeve pipe 11 excessively in the reducer union 9 and annulus access Φ 2 between the central tube 2 and the liquid bath Φ 3 excessively on the cylinder barrel 15.When well-flushing finishes, during water filling, the pressure in the central tube 2 raise again, and flushing valve 13 just can be pushed once more and move upward, and annulus access Φ 2 is closed.Sand block cap 8 is lived the sand shelves that sink to packer top when normal water filling and well-flushing, does not allow it enter the chamber of packer inside, satisfies the technical requirements of normal water filling of dispensing well and anti-flushing well.Guarantee that with this present invention is in steady-working state all the time, reach the prolongation packer purpose in application life.When the water injection well construction need be disanchored deblocking, the upper lifting pipe post, shear pin 18 is cut off, the contraction pawl at slips 6 two ends shrinks under the cover 7 pressure tension and compression effects at slips telescopic 4 and slips, slips 6 will be forced to shrink, the packing element assembly 10 of packer also shrinks deblocking simultaneously, reaches the purpose of the deblocking of disanchoring smoothly.

The invention has the beneficial effects as follows, be provided with sand block cap, anchor fluke pressure contracting mechanism, big well-flushing passage and well-flushing switch in this sand prevention water injection packer, the sand shelves that can will sink to packer top are lived, do not allow it enter the chamber of packer inside, the generation of card well accident when water injection packer sand card and deblocking are arranged when avoiding reduces causality loss; Can satisfy normal water filling of dispensing well and big discharge capacity anti-flushing well needs; When needs were disanchored deblocking, the upper lifting pipe post was cut off shear pin, and the contraction pawl of slips can be shunk cover pressure tension and compression contraction by slips telescopic and slips, realizes smoothly disanchoring, and the packing element assembly of packer also shrinks also deblocking simultaneously.

Description of drawings

Accompanying drawing is the vertical section constructional drawing of a kind of embodiment.

Among Fig. 1: 1. top connection, 2. central tube, 3. pressure cap, 4. slips telescopic, 5. anchor main body, 6. slips, 7. slips shrinks cover, 8. sand block cap, 9. reducer union, 10. packing element assembly, 11. sleeve pipes, 12.0 shapes circle, 13. flushing valve, 14. pistons, 15. cylinder barrels, 16 self-locking pipes, 17. from lock tube, 18. shear pins, 19. lower contacts, Φ 1. crosses liquid bath, Φ 2. crosses the liquid passage, and Φ 3. crosses liquid bath, Φ 4. pressure transmission holes.

The specific embodiment

The present invention is further described below in conjunction with drawings and Examples.

In the embodiment shown in fig. 1, central tube 2 is for there is external screw thread two ends and middle and lower part, and there are pressure transmission hole Φ 4 and circular hole in the middle and lower part.Slips telescopic 4 is that an end internal diameter has internal thread for a short time, and the middle part internal diameter is big, and the internal diameter of the other end is less than the internal diameter at middle part, and its changeover portion is the inner conical surface horn mouth, and the termination is an outer conical surface.Anchor main body 5 is for there is internal thread at two ends, and symmetry vertically has two sides for facing directly on the cylindrical of middle part, and two ends are outer cone inclined-plane dovetail groove.Slips 6 is the plane for both sides, on the short exterior arc surface card tooth is arranged, another long exterior arc surface two ends have conical surface boss to shrink pawl, in the joint portion of inside and outside exterior arc surface, two ends are the trapezoidal of inner cone arc surface, and the another side of inside and outside circle cambered surface is an inner arc surface.Sand block cap 8 is that the inside and outside footpath of an end is little, and external screw thread is arranged, and middle part internal diameter, outer big has internal thread, and other end internal diameter is bigger.Reducer union 9 is that an end internal diameter is little, and external screw thread is arranged, and the middle part internal diameter is big, has liquid bath Φ 1, and other end internal diameter is bigger, and internal thread is arranged, and large diameter end external diameter is big, and the remainder external diameter is little.Sleeve pipe 11 is that the termination of an end is an internal conical surface, and external screw thread is arranged, and the other end has the tubular body of outer conical surface.Flushing valve 13 is that an end external diameter is little, and the termination cylindrical is a taper seat, and other end external diameter is big, has groove on internal diameter and big or small external diameter.Cylinder barrel 15 respectively has internal thread for two ends, has liquid bath Φ 3 at the end root near internal thread.Self-locking pipe 16 is on the end root side internal thread hole to be arranged, and remainder has outer sawtooth button screw thread.From lock tube 17 is that an end internal diameter is smaller, and external screw thread is arranged, and the middle part internal diameter is big, and other end internal diameter has interior sawtooth button screw thread for a short time, and vertical equal portions have groove below external screw thread.

In anchor main body 5, slips 6, slips telescopic 4, slips are shunk cover 7 pack into successively; Slips shrinks cover 7 usefulness and is threaded on the anchor main body; The contraction pawl at slips 6 two ends is respectively charged into slips telescopic 4, slips shrinks in the interior circular horn mouth of cover 7; One end of central tube 2 penetrates from the endoporus that slips shrinks cover 7, and through the inner arc surface of slips 6, the endoporus from slips telescopic 4 penetrates again, with being threaded on the slips telescopic 4; Form anchor and anchor fluke and force contracting mechanism.

Sand block cap 8 usefulness are threaded on the anchor main body 5; Behind the reducer union 9 cover upper center tubes 2, with being threaded on the sand block cap 8; It is crossed liquid bath Φ 1 and is covered by sand block cap 8, forms sand block mechanism.Sleeve pipe 11 usefulness are threaded on the packing element assembly 10; Packing element assembly 10 usefulness are threaded in the reducer union 9; Flushing valve 13 is enclosed within on the central tube 2 after installing O shape circle 12; Piston 14 installs O shape circle 12 backs with being threaded on the central tube 2; Cylinder barrel 15 is inserted in piston 14, flushing valve 13 backs with being threaded on the packing element assembly 10; And, form packing device, well-flushing passage and well-flushing switching mechanism jointly by the annulus access Φ 2 between mistake liquid bath Φ 1, sleeve pipe 11 and the central tube 2, mistake liquid bath Φ 3.Self-locking pipe 16 is enclosed within on the central tube 2; Shear pin 18 usefulness are threaded on the screwed hole of self-locking pipe 16, and smaller diameter end is inserted in the circular hole of central tube; Respectively with being threaded on self-locking pipe 16 and the cylinder barrel 15, form self-locking device from lock tube 17.With being threaded on the central tube 2, present embodiment is just assembled and is finished respectively for top connection 1, lower contact 19.

The mode that install and use at scene of the present invention is achieved in that when site operation uses, the present invention is serially connected between the oil pipe by designing requirement, instantly after projected depth, seated well head, connect good pipeline, behind the qualified metaideophone of well-flushing, ground pumps into clear water and suppresses 8Mpa and get final product grappling, set.When oil, water well drilling need disanchor, during deblocking, the upper lifting pipe post is cut off shear pin 18, can disanchor, deblocking.

Claims

1. sand prevention water injection packer is characterized in that: top connection (1), central tube (2), pressure cap (3), slips telescopic (4), anchor main body (5), slips (6), slips shrink cover (7), sand block cap (8), reducer union (9), packing element assembly (10), sleeve pipe (11), O shape circle (12), flushing valve (13), piston (14), cylinder barrel (15), self-locking pipe (16), connect to form successively from lock tube (17), shear pin (18), lower contact (19).

2. sand control water packer according to claim 1, it is characterized in that: in anchor main body (5), with slips (6), slips telescopic (4), slips shrinks cover (7) and packs into successively, slips shrinks cover (7) with being threaded on the anchor main body (5), the contraction pawl at slips (6) two ends is respectively charged into slips telescopic (4), slips shrinks in the interior circular horn mouth of cover (7), one end of central tube (2) penetrates from the endoporus that slips shrinks cover (7), inner arc surface through slips (6), endoporus from slips telescopic (4) penetrates again, with being threaded on the slips telescopic (4), forming anchor and anchor fluke and force contracting mechanism; Sand block cap (8) is with being threaded on the anchor main body (5); Behind reducer union (9) the cover upper center tube (2), with being threaded on the sand block cap (8), it is crossed liquid bath (Φ 1) and is covered by sand block cap (8), forms sand block mechanism; Sleeve pipe (11) is with being threaded on the packing element assembly (10), packing element assembly (10) is with being threaded in the reducer union (9), flushing valve (13) is enclosed within on the central tube (2) after installing O shape circle (12), piston (14) installs O shape circle (12) back with being threaded on the central tube (2), cylinder barrel (15) is inserted in piston (14), flushing valve (13) back is with being threaded on the packing element assembly (10), and by crossing liquid bath (Φ 1), annulus access (Φ 2) between sleeve pipe (11) and the central tube (2), cross liquid bath (Φ 3), form packing device jointly, well-flushing passage and well-flushing switching mechanism; Self-locking pipe (16) is enclosed within on the central tube (2), shear pin (18) is with being threaded on the screwed hole of self-locking pipe (16), and smaller diameter end is inserted in the circular hole of central tube (2), respectively with being threaded on self-locking pipe (16) and the cylinder barrel (15), form self-locking device from lock tube (17).

3. sand control water packer according to claim 2 is characterized in that: central tube (2) is for there is external screw thread two ends and middle and lower part, and there are pressure transmission hole (Φ 4) and circular hole in the middle and lower part; Slips telescopic (4) is that an end internal diameter has internal thread for a short time, and the middle part internal diameter is big, and the internal diameter of the other end is less than the internal diameter at middle part, and its changeover portion is the inner conical surface horn mouth, and the termination is an outer conical surface; Anchor main body (5) is for there is internal thread at two ends, and symmetry vertically has two sides for facing directly on the cylindrical of middle part, and two ends are outer cone inclined-plane dovetail groove; Slips (6) is the plane for both sides, on the short exterior arc surface card tooth is arranged, another long exterior arc surface two ends have conical surface boss to shrink pawl, in the joint portion of inside and outside arc surface, two ends are the trapezoidal of inner cone arc surface, and the another side of inside and outside circle cambered surface is an inner arc surface; Sand block cap (8) is that the inside and outside footpath of an end is little, and external screw thread is arranged, and the middle part external diameter is big, and internal thread is arranged, and other end internal diameter is bigger; Reducer union (9) is that an end internal diameter is little, and external screw thread is arranged, and the middle part internal diameter is big, has liquid bath Φ 1, and other end internal diameter is bigger, and internal thread is arranged, and large diameter end external diameter is big, and the remainder external diameter is little; Sleeve pipe (11) is that the termination of an end is an internal conical surface, and external screw thread is arranged, and the other end has outer conical surface; Flushing valve (13) is that an end external diameter is little, and the termination cylindrical is a taper seat, and other end external diameter is big, has groove on internal diameter and big or small external diameter; Cylinder barrel (15) respectively has internal thread for two ends, has liquid bath (Φ 3) at the end root near internal thread.