CN200949445Y

CN200949445Y - Plugging packer for small borehole oil-gas water well

Info

Publication number: CN200949445Y
Application number: CN 200520093855
Authority: CN
Inventors: 孙成威; 付相秋; 刘雪峰; 郭子章
Original assignee: Liaohe Petroleum Exploration Bureau
Current assignee: Liaohe Petroleum Exploration Bureau
Priority date: 2005-11-24
Filing date: 2005-11-24
Publication date: 2007-09-19
Anticipated expiration: 2015-11-24

Abstract

The utility model relates to a plugging-type packer for slim-hole oil-water wells and belongs to underwell packer devices. Currently, the packer for plugging the oil-water layer of the level sidetracking well is not easy to seal in the level well section and to achieve the purpose of sealing the oil-water level. Thus, the device adopts a structure formed of a sheath which is connected by a releasing sub joint of the packet, a central pipe rectangular spring, a locking tooth, a swelling sleeve, a base sealing pin, a clip tooth, and a valve lock in the packer rubber. And the outer wall of the packet is provided with a centralizer, the releasing sub joint is provided with a ball base inside, and six magnetic poles are arranged around the ball base. Thus, in the lower sinking well the utility model can have effects of mediacy, eccentric wear prevention and strict base sealing and resolve the difficulty of small casing wells plugging the oil-water layer. The device is simple structured, convenient to use and can be extensively used inside small casing wells.

Description

A kind of slim-hole oil gas water well plugging type packer that is used for

Technical field:

The utility model relates to a kind of slim-hole oil gas water well plugging type packer that is used for, and belongs to oil well downhole packing apparatus class.

Background technology:

At present, oil well is carrying out pressure break with the plugging type packer, acidifying, water blockoff, oil production by layer, seperated layer water injection, all in the conventional cannula of 177.8 millimeters of Φ 139.7 and Φ, implement when annotating oil producing operation such as vapour, for minor diameter is Φ 78, Φ 88, the sidetracked hole horizontal well of Φ 100 mm dias is because well is little, and be in level, existing packer construction can not satisfy the needs of sealing oil reservoir or water layer, particularly in sidetrack horizontal well, packer is gone into the well and is the level of approximation state, owing to influenced by hole anomaly, packing element above the packer is constantly under the heavy effect of completion sand, cause damage, in addition, when suppressing the seat envelope, the packer body also is subjected to not influence between two parties, can not press close to casing wall and be difficult to realize that sealing does not have the effect of packing target zone, secondly, packer in the existing technology uses the low-alloy steel material to make, because the low constant phenomenon that is damaged of scuff resistance.In the construction, cause down-hole accident constantly to take place, the well that very has can't be constructed at all.

The utility model content:

The purpose of this utility model is a kind of slim-hole oil gas water well plugging type packer that is used for that provides in order to overcome above-mentioned shortcoming, the improvement of this instrument on existing plugging type packer basis, the packer after the improvement can be implemented shutoff and carry out pressure break, acidifying, water blockoff and oil production by layer in the casing side tracking horizontal well of 78,88,100 millimeters of diameters.

The technical solution of the utility model is:

For achieving the above object, packer described in the utility model is the packer sheath that is connected by the back-off sub on the packer body, and the packing element inner central tube below the sheath, rectangle spring, lock tooth, ringfeder, seat blockade nail, Ka Ya and lock dog are formed.Packer body outer wall two ends have pin thread, by the centralizer that screw thread connects respectively, a ball seat are arranged in the described back-off sub, are evenly inlaying diameter on the ball seat circumferential edges and be six magnetic poles of 10 centimeters.

The annulus that described centralizer adopts the 35CrMo material to make, be fixed on the packer cylindrical with screw thread, on the outer wall of annulus, evenly welding the steel pricker shape blade of three triangular shapes, each blade top to packer body radius greater than packer body radius.

The utility model working method is:

When going into the well, at first will go up the utility model, following two ring-type centralizers are not fixed on the packer by the internal thread deduction of points, upper/lower positions, to make during by dress and keep not contact condition between the packing element and the borehole wall, prevent the packing element of grinding away, by screw thread tubing string is inserted in back-off sub then, G.I.H, instantly behind the precalculated position, suppress in oil pipe, fluid enters the packer inner chamber through central tube, then, rectangle spring in the liquid compression packer makes the lock tooth open at this moment, and ringfeder moves down, after seat offset nail was cut off, ringfeder continued to move down, and makes packer card tooth tightly be stuck in internal surface of sleeve pipe, the packing element spreading, the seat envelope is finished in lock dog locking, realizes the oil reservoir packing.When giving up, drop into steel ball in oil pipe, screw is cut off in giving up in the oil pipe, gives up this moment to trip out well head with tubing string and finish whole seat envelope.

The utility model compared with prior art has distinguishing feature.

Because the utility model is the improvement on plugging type packer basis, during construction, because physical dimension is little, the seat envelope is simple, and deblocking is reliable, has solved the oil reservoir packing difficult problem of the sidetrack horizontal well of slim-hole (78,88,100 millimeters of casing inner diameters) thus.

In addition, also upper and lower two centralizers that have screw thread are housed on the outer wall of the body of packer by the utility model, three triangular shape steel pricker shape blades are arranged on the outer rim of centralizer, can guarantee to make in the sleeve pipe of packer approaching side horizontal well drilling section level of approximation well section the packing element that is used for shutoff above the packer can be placed in the middle in well like this, packing element can be pressed close to casing wall when helping shutoff.In addition, use packer can prevent packer sand setting friction (sand setting does not exist in the peupendicular hole section) when net horizontal section is migrated and in the well again, and the damage packing element, cause the failure of seat envelope, packing element when the length of three of centralizer triangular shape tapered blade all can guarantee to go into the well is not in addition ground away, and when envelope seat, it is identical that packing element and blade open external diameter, so promptly guaranteed packer sealing, the blade of can not grinding away again.Because packer has adopted the 40NiCr alloy steel material to make, and has guaranteed stronger hardness, has prolonged application life.

In addition, in the ball socket structure in the utility model owing to assembled the magnetic pole of 6 10 centimeters diameters on its surrounding edge, when pitching builds the pressure, can make tighter that its steel ball that works the usefulness that builds the pressure is located in like this under suction, thereby can guarantee packer set in the sidetrack horizontal well.

Description of drawings:

Fig. 1 is the utility model structural representation.

Fig. 2 is a centralizer structure schematic diagram of the present utility model.

Among the figure by 1, back-off sub, 2, packer, 3, packing element, 4, inner central tube, 5, the rectangle spring, 6, the lock tooth, 7, ringfeder, 8, seat blocks nail, 9, the card tooth, 10, lock dog, 11, ball seat, 12, centralizer, 13, blade, 14, annulus forms.

The specific embodiment:

The utility model is provided by following examples.

Below in conjunction with accompanying drawing the utility model is described further.

Among Fig. 1, back-off sub 1 is the pipe joint of the two ends band screw thread that the 35CrNo material becomes, and left end is connected with oil pipe, and right-hand member links to each other with fishing joint in the packer; Ball seat 11 is housed in back-off sub 1, it is to use the 35CrNo material that ball seat is " recessed " word shape, there is the duct at the ball seat center, central tube 4 in this duct and the packer communicates, and is evenly inlaying the magnetic sheet of six 10 centimeters diameters on the scene-affinity of described ball seat circumferential edge, when being used for adsorbing pitching, be located in the steel ball of ball seat top, not influenced by hole deviation and horizontal segment, play strong magnetic seal effect, whole packer set is firmly acted on.

Packer 2 has adopted the 40NiCr alloy steel material to make, solved because borehole size limits the demanding contradiction of mechanical performance, in addition, for preventing instrument in net horizontal section or the circuitous resistance of lead sealing place, the instrument exterior design be streamlined can in well, remove so smooth and easy.

Packing element 3 adopts the butyronitrile rubber material to make.

Among Fig. 2, centralizer 12 is annulus 14 that are made with the 35CrNo alloy steel material, screw thread is arranged in the annulus, evenly welding the steel pricker blade 13 of three triangular shapes on the outer wall, each blade centerline is 120 degree with circle center angle, centralizer 12 is made the back and is attached at respectively on the packer 2 by screw thread, following two ends, each blade 13 top should be greater than the radius of packer to the diameter of packer 2 during arrangement, and the radius of packing element 3 should be identical with the radius after the packer distending is arrived on blade 13 tops to the packer center radius above the packer, like this, can remain on to be lowered in the sidetrack horizontal well in the way not influenced by sand setting, after the packing element pressure-bearing, packing element can closely paste with casing wall mutually, plays the effect that seat secures.

In addition, all the other form of structure of the utility model all are considered as existing technology.

Claims

1, a kind of slim-hole oil gas water well plugging type packer that is used for, packer sheath that connects by the back-off sub (1) on the packer (2) and the packing element (3) below the sheath, inner central tube (4), rectangle spring (5), lock tooth (6), ringfeder (7), seat block nail (8), card tooth (9) and lock dog (10) and form; It is characterized in that: the centralizer (12) that described packer (2) outer wall two ends connect respectively by screw thread; A ball seat (11) is arranged in the described back-off sub (1), evenly inlaying diameter on the ball seat circumferential edges and be six magnetic poles of 10 centimeters.

2, a kind of slim-hole oil gas water well plugging type packer that is used for according to claim 1, it is characterized in that: described centralizer (12) is an annulus (14) of making of 35CrNo alloy steel material, on the outer wall of annulus, evenly welding the steel pricker shape blade (13) of three triangular shapes, each blade top to packer (2) radius greater than packer (2) radius.

3, a kind of slim-hole oil gas water well plugging type packer that is used for according to claim 1 is characterized in that: described packer (2) adopts the 40NiCr alloy steel material to make.