CN2651434Y - Small-well cracking packer - Google Patents

Abstract

The utility model discloses a slim hole fracturing packer belonging to production well tool. The oil well fracturing initiates from 1940s and has been developed as the fracturing technology that aiming at different oil deposits and various casing programmes and achieving substantial development for the fracturing liquid proppant and the fracturing technics till now. Therefore, the fracturing technology, served as the mature technology, has been widely used for oil fields at home and abroad while the slim hole fracturing packer is still lie in research phrase. The utility model, in demand, adopts the fracturing packer with the outer diameter of 80 mm and composed of a joint, an adjusting ring glue cylinder limit sleeve, a centralizer, a slip ring sleeve and a reversing track, which, when in use, is available of decapsulating if lifting and is capable of setting both lifting and lowering down; therefore, the utility model is characterized in that: the packer has large construction pressure, which not only ensures the sealing but also makes the tubular pile lifted out from the drilling well favorably after decapsulation; the tool can satisfy the construction for the fracturing well with the oil pipe inner diameter of 86 mm. The utility model, with simple operation, rational structure and reliable setting, is applicable for fracturing of slim hole.

Description

A kind of slim-hole pressure break packer

Technical field:

The utility model relates to a kind of slim-hole and presses packer, belongs to oil recovery downhole tool class.

Background technology:

The oilfield fracturing technique starts from the forties in 20th century, and development has formed the fracturing technique at the different casing programmes of different oil reservoirs so far, and at the fracturing fluid proppant, the fracturing technology aspect has all obtained significant progress.Therefore, pressure break has been the extensive use of domestic and international oil field as mature technology.At present along with sidetracked hole, the horizontal broad application of sidetracking, the slim-hole fracturing technique also needs to propose scheme correspondingly, and therefore, the slim-hole Fracturing Technique Study begins starting just at home and abroad, and the domestic initial period that still is in.

The utility model content:

The utility model purpose is in order to overcome above-mentioned shortcoming, and a kind of slim-hole pressure break packer that proposes.This device can carry out pressing crack construction in the fractured well of pipe aperture φ 86mm, during construction, can guarantee that in well safety sets, the passing through smoothly of fluid and sand liquid when deblocking also can satisfy pressure break smoothly again, and the slips in the tool using is safe and reliable.

The utility model is to realize like this.

It is made up of by the central tube and the packing element of screw thread screwed connection top connection.The cylindrical shape adjustable ring that it is characterized in that cylindrical this joint of top connection shape and following position is by being threaded, the bottom of adjustable ring be enclosed within central tube above, seal with round section joint ring, described central tube outside is with the cylindrical shape rubber tube, the stop collar of packing in the rubber tube lower end is enclosed in above the central tube, it is cylindric that stop collar is, the upper end has step, the sealing of one sealing ring is arranged between stop collar and central tube, the stop collar lower end a cone with screwed connection, and this cone profile is coniform, and the screw thread on top links to each other with stop collar, the outside, bottom is tapered, and the inboard also is provided with a step.An envelope shear pin and a central tube are arranged below described cone, a wedge slips is equipped with in the central tube outside, and this slips has four lobes, and the card tooth is equipped with in the outside of slips, its top is fixed with spring, cylindrical shape also is housed below slips sets upright seat, it is set upright the seat middle part and is shaped as recess, and upside is processed with slip groove, spring leaf is arranged in the depression successively, slip ring sleeve below pressure cap and the centralizer body, centralizer body is set upright seat by screw thread and cylindrical shape and is linked together.

Described pressure break packer external diameter is 75～85mm, and preferred outside diameter is 80mm.

Working method of the present utility model is:

During pressure break oil pipe is connected above the top connection, slowly transfer tubing string, rotate tubing string then, just change 5～10 circles, observing the weight indicator suspending weight simultaneously, when carrying out packer set, press earlier desired height upper lifting pipe post, and then transfer, at this moment, spring just can make wiper block and internal surface of sleeve pipe produce in the inside groove of central tube track above the top dead-centre that friction impels slip ring pin elongated slot when the top dead-centre of short groove migrates to seat envelope position.So slips is pushed open by cone, disturb state card jail in the permanent position of internal surface of sleeve pipe by original receipts, simultaneously, seat envelope shear pin is cut off under the effect of tubing string weight, top connection, the together descending compression packing element of adjustable ring and track central tube makes its diameter become big, play the effect of Seal Oil, sleeve pipe annular space, just can carry out the wellfracturing construction then.

The utility model compared with prior art has remarkable advantage:

Because the utility model external diameter is little, has only 80mm, and adopted adjustable ring, packing element, spacing ring, slips, parts such as cone and commutation track have been formed packer, have rational in infrastructure, set, deblocking is reliable, the packing performance is good, and the packing element heatproof can reach 120 ℃ advantage, in addition, the central tube latus rectum of instrument, fluid and sand liquid can pass through smoothly in the time of can also guaranteeing pressure break, and slips is safe and reliable, and it is φ 86mm that the utility model has solved internal diameter, slim-hole is at the pressing crack construction that carries out sidetracked hole, sidetracking well.

Description of drawings:

Accompanying drawing: the utility model structural representation.

Among the figure: the utility model by 1, top connection, 2, adjustable ring, 3, packing element, 4, baffle ring, 5, stop collar, 6, cone, 7, slips, 8, spring, 9, set upright seat, 10, pressure cap, 11, centralizer body, 12, spring leaf, 13, slip ring sleeve, 14, reversing cover, 15 envelope shear pins, 16, central tube forms.

The specific embodiment:

The utility model following examples provide.

Be described further below in conjunction with accompanying drawing.

1 top connection is cylindrical among the figure, two ends have box, the upper end links with oil pipe during construction, adjustable ring 2 is a cylindrical shape, top is that pin thread is connected in top connection 1 lower end, the bottom is enclosed within above the central tube 16, the centre has one " O " shape sealing ring to form sealing with central tube, packing element 3 cylindrical rubber tubes, be enclosed within on the central tube 16, behind the packing element pressurized, can form the sealing of oil casing annular space, remove the attitude that to restore to the original state at pressure, stop collar 5 is a cylindrical shape, be enclosed in above the central tube 16, its effect is that above-mentioned three packing element branches are kept apart, in the stop collar upper end one step is arranged, be installed in central tube above, and it is moving to make the liquid of 16 of stop collar 5 and central tubes that string not take place by sealing ring, these parts are when the packing element pressurized, upper step can play position-limiting action, it is conical that cone 6 profiles are, the top screw thread links to each other with stop collar 5, the outside, bottom is tapered, and slips is risen along the conical surface, inboard step, can make cone along on central tube 16 outer walls, move down, seat offset nail 15 plays fixedly cone 6 effects before packer work, to prevent packer when the no show block-up position, seat seals in advance, slips 7 is wedge, be divided into four lobes, in its outside of slips a watt tooth arranged, there is the gradient that cooperates with cone the inboard, slips top is attached on the cone, downside is contained in to be set upright in the groove, and work front spring 8 is fixed on to be set upright in the groove, and the described seat 9 of setting upright is the cylindrical shape of medial recess, upside is processed with the groove that slips is installed, centralizer body 11 is housed in the depression, sets upright cover for seat on central tube 16, in the depression of setting upright seat 9, spring leaf 12 pressure caps 10 are housed also successively.Slip ring sleeve 13 cylindrical with screw thread with set upright seat 9 and connect together, a slip ring pin (figure is mark not) is housed in slip ring sleeve 13, be fixed on the slip ring sleeve by screw thread, the slip ring pin can be done the track commutation along the rail groove of central tube and move, cause the slip ring pin from short groove dead point, move to the elongated slot dead-centre position when setting, cone is strutted slips, tightly be stuck on the internal surface of sleeve pipe, this moment, packer was in the down-hole string position, firmly simultaneously fixing, under tubing string weight, make packing element 3 diameters become big, and the oil jacket annular space is sealed, it is top dead-centre that the track of described central tube is " W " shape (figure is mark not) top, and the bottom is a bottom dead centre.

Pressure break packer external diameter is φ 80mm, and the fractured well that is suitable for pipe aperture and is φ 86mm uses, and during work, adopts the put-on and delegated mode to set, on to put forward mode be deblocking.

Described packer external diameter is 75～85mm, and optimum diameter is 80mm.

Claims (2)

1, a kind of slim-hole pressure break packer, form by the central tube (16) of screw thread screwed connection and the packing element (3) of central tube outside by top connection (1), cylindrical this joint of the top connection of stating (1) shape that it is characterized in that and the cylindrical shape adjustable ring (2) at following position are by being threaded, the bottom of adjustable ring be enclosed within central tube above, seal with round section joint ring, described central tube outside is with cylindrical shape rubber tube (3), the stop collar (5) of packing in the rubber tube lower end is enclosed in above the central tube, stop collar (5) is cylindric, the upper end has step, the sealing of one sealing ring is arranged between stop collar (5) and central tube (16), the stop collar lower end a cone (6) with screwed connection, and this cone profile is coniform, and the screw thread on top links to each other with stop collar, the outside, bottom is tapered, and also there is a step inboard.It is conical that cone (6) profile is, the top screw thread links to each other with stop collar (5), the outside, bottom is tapered, join with slips (7), have above the slips, seat offset nail (15), slips (7) is a wedge, be divided into four lobes, in its outside of slips a watt tooth arranged, there is the gradient that cooperates with cone the inboard, top is attached on the cone, downside is contained in to be set upright in the groove, and spring (8) is fixed on to be set upright in seat (9) groove, and the described seat (9) of setting upright is the cylindrical shape of medial recess, upside is processed with the recessed groove that slips is installed, in centralizer body (11) is housed, this cover for seat on central tube (16), set upright the seat (9) depression in spring leaf (12) pressure cap (10) also is housed successively.Slip ring sleeve (13) cylindrical with screw thread with set upright the seat (9) connect together.

2, a kind of slim-hole pressure break packer according to claim 1, the external diameter that it is characterized in that the pressure break packer is 75～85mm, preferred outside diameter is 80mm.

Images