CN105625980A

CN105625980A - Non-throttling Y344 type fracturing set packer

Info

Publication number: CN105625980A
Application number: CN201510259178.2A
Authority: CN
Inventors: 王书海
Original assignee: YANCHENG CHANGHAI PRECISION MACHINERY Co Ltd
Current assignee: Yancheng Changhai Pml Precision Mechanism Ltd
Priority date: 2015-05-16
Filing date: 2015-05-16
Publication date: 2016-06-01
Anticipated expiration: 2035-05-16
Also published as: CN105625980B

Abstract

The invention discloses a non-throttling Y344 type fracturing set packer. The non-throttling Y344 type fracturing set packer comprises an upper connector, a rubber barrel, a slide block center pipe, a power slide block, a spring center pipe, a spring, a spring driving shell, a hydraulic cavity, an air cavity and a sealing ring. The inner diameter and the outer diameter of the sealed air cavity and the inner diameter and the outer diameter of the hydraulic cavity communicating with the center pipe are maintained to be the same so as to ensure that the area of the interaction force is the same. In the construction process, differential pressure exists between the air cavity and the hydraulic cavity and is a power source for achieving set packing of the rubber barrel. The set packing mode of the rubber barrel is only related to pressure inside a pipe column and not influenced by the differential pressure of the inside and the outside of the pipe column and the flow quantity and the flow velocity of liquid inside the pipe column, and set packing is achieved without sandblaster throttling. Therefore, the set packer can provide a possibility for large displacement sandblasting of the sandblaster. When the sandblasting amount of the maximum drift diameter of the set packer is achieved, due to the fact that the drift diameter is increased, the flow velocity of liquid containing sand inside a tool is decreased, and abrasion to an assembly in the pipe column is reduced; accordingly, the service lift of the tool is prolonged, the use security is improved, and the working efficiency and the construction quality are improved.

Description

Un-throttled sets Y344 type fracturing packer

Technical field

The present invention relates to oil drilling and r eoovery machine equipment, particularly a kind of un-throttled sets Y344 type fracturing packer.

Background technology

Since reform and opening-up, national economy is quickly increased, " scientific and technical innovation, autonomous innovation " become current domestic industry development main flow, China industry just progressively to intensive style, energy-saving and emission-reduction, low-carbon (LC) direction develop. Oil is China's development of modern industry " blood " and economic lifeline, is a kind of important strategic resource, affects the stability and security of national energy. In oil exploitation, oil well through long-term production, the organic precipitation of reservoir fluid and shaking out, necessarily cause the blocking of reservoir pore space near shaft bottom, cause porosity and permeability to decline, affect oil well yield. Therefore exploit the later stage at oil well, process frequently with fracture acidizing, to change low yield state. Fracture acidizing operating tool string needs with packer, relevant stratum is insulated up and down, carry out the corresponding oil reservoir of fracture acidizing. In multiple fracturing tubing string, now frequently with expanding K344 packer, set by the hydraulic pressure difference existed in operating tool string and between oil, sleeve pipe, this kind sets mode shortcoming and is in that to form tubing string inside and outside differential pressure, it is accomplished by the sanding machine below packer to throttle, limits operating tool string sandblasting amount, sacrifice efficiency of construction, and aggravate the abrasion of sanding machine aperture, increase the load of ground pump pressure equipment. Simultaneously when transferring tubing string easily because borehole pressure fluctuation produces unnecessary setting, friction is occurred to damage. In order to solve the problems referred to above, the scientific and technical personnel of R&D institution constantly research and discovery, research and develop novel packer, although make some progress technically, but in practice, yet suffer from the technical barrier not yet overcome.

Summary of the invention

It is an object of the invention to overcome above deficiency, it is provided that un-throttled sets Y344 type fracturing packer. Having sealing air chamber and the hydraulic cavities connecting central canal inside this packer, its air chamber keeps equal with the internal-and external diameter of hydraulic cavities. In work progress, the pressure reduction existed between air chamber and hydraulic cavities, set offer power for packing element. Achieve the condition of setting, only with pressure correlation in tubing string, not by tubing string inside and outside differential pressure and liquid in pipe flow velocity, flow effect, so not needing sanding machine throttling to set pressure reduction to provide, thus, this packer is that sanding machine huge discharge sandblasting provides possibility, the whole operating tool string made realizes the logical sand amount of maximum diameter, increase because of latus rectum, reduce the frictional resistance of tool interior, decrease the abrasion of each assembly in tubing string, extend the service life of instrument, improve safety in utilization, improve work efficiency and construction quality.

The technical solution adopted for the present invention to solve the technical problems is: containing top connection, packing element, its center pipe, power slide block, spring center pipe, spring, Spring driving shell, hydraulic cavities, air chamber, sealing ring, three groups of packing elements and spacer ring it is sequentially provided with outside top connection, its end is connected to its center pipe, its center pipe outside power slide block, under connect spring center pipe, by its center pipe, the annular seal space that power slide block is constituted is called air chamber, by power slide block, its center pipe, the cavity that spring center pipe is constituted is hydraulic cavities, Spring driving shell is connect under power slide block, it is provided with spring between Spring driving shell and spring center pipe, its center pipe, spring center pipe, three groups of sealing rings it are provided with between power slide block, composition un-throttled sets Y344 type fracturing packer.

The know-why that the present invention adopts is: adopt machinery and Pneumatic hydraulic principle design to form, with the difference of air and the physical property of water both media, i.e. and the universal pilot performance of water and low compression ratio, and the high compression ratio physical characteristic of air. Liquid injects hydraulic cavities by the slot on its center pipe, when fluid pressurization in central canal, pressure reduction is produced between hydraulic cavities and air chamber, air chamber and spring stress compression, power slide block, to air chamber one side shifting, promotes packing element simultaneously, and packing element is subject to axial force extruding radial and expands, close the annular space between oil pipe and sleeve pipe, play packing effect; When liquid pressure release in central canal, power slide block is subject to the opposition forced resetting of spring and air chamber, completes deblocking.

The invention has the beneficial effects as follows: this packer adopt the pressure reduction between air chamber and hydraulic cavities formed set generation have the advantages of three aspects. One is, this packer uses simple, convenient, and namely pressurization sets, pressure release and deblocking. Because setting condition and pressure correlation in tubing string, it is simple to control. This spring being externally provided with can increase air chamber bearing capacity, forces the function of deblocking after also having pressure release, takes out smoothly for tool tubular column and provides guarantee. Two are, it may be achieved operating tool string sediment outflow amount maximizes, and this packer setting does not need sanding machine throttling to set pressure reduction to provide, and improves sediment transport efficiency. Three are, packing element sets effective stable, adopt compression to set mode, and effect is just better than expanding packing element in theory. The utilization of pretension deblocking spring, it is to avoid in the process of going into the well, the fluctuation of down-hole pressure causes that unnecessary setting occurs in packing element, and causes the damage of packing element. It addition, be provided with limited step on its center pipe, it is to avoid bottom hole pressure difference is excessive causes the excessive movement of power slide block, it is prevented that packing element, by excessive condensation, causes fatigue to follow the string or breaks, impact sets effect.

Figure of description

It is presented herein below and in conjunction with the accompanying drawings and embodiments the present invention is further described:

Fig. 1 is the front view that non-throttling sets Y344 type fracturing packer;

Fig. 2 is the full sectional view that non-throttling sets Y344 type fracturing packer.

Fig. 1, in 2: 1 top connection, 2 packing elements, 3 its center pipes, 4 power slide blocks, 5 spring center pipes, 6 springs, 7 Spring driving shells, 8 hydraulic cavities, 9 air chambers, 10 sealing rings.

Detailed description of the invention

Fig. 1, in 2, containing top connection 1, packing element 2, its center pipe 3, power slide block 4, spring center pipe 5, spring 6, Spring driving shell 7, hydraulic cavities 8, air chamber 9, sealing ring 10, three groups of packing elements 2 and spacer ring it is sequentially provided with outside top connection 1, its end is connected to its center pipe 3, its center pipe 3 outside power slide block 4, under connect spring center pipe 5, by its center pipe 5, the annular seal space that power slide block 4 is constituted is called air chamber 9, by power slide block 4, its center pipe 3, the cavity that spring center pipe 5 is constituted is hydraulic cavities 8, Spring driving shell is connect under power slide block, spring 6 it is provided with between Spring driving shell 7 and spring center pipe 5, its center pipe 3 is located at by three groups of sealing rings 10, spring center pipe 5, between power slide block 4, composition un-throttled sets Y344 type fracturing packer.

This packer adopts machinery and Pneumatic hydraulic principle design to form, difference with air and the physical property of water both media, the i.e. universal pilot performance of water and low compression ratio, and air expansion performance, liquid is covered with hydraulic cavities by the slot on its center pipe 3, when fluid pressurization in central canal, pressure reduction is produced between hydraulic cavities 8 and air chamber 9, air chamber 9 and spring 6 forced compression, power slide block 4 is to air chamber one side shifting, promote packing element 2 simultaneously, packing element 2 is subject to axial force extruding radial and expands, close the annular space between oil pipe and sleeve pipe, play packing effect, when liquid pressure release in central canal, power slide block 4 is subject to the opposition forced resetting of spring 6 and air chamber 9, completes deblocking.

In structural design, this packer setting condition is formed by the pressure reduction between air chamber and hydraulic cavities to set, throttling such as K344 packer sets, K344 sets need to by the area control of sanding machine sand jet outlet, produce current limliting, and produce the pressure reduction between oil, sleeve pipe, realizing setting, the congenital sediment outflow amount that cannot realize maximizes again; As Y341 packer machinery sets, the auxiliary in Y341 structure sets parts, needs bigger power when lifting up deblocking, existence cannot the risk of deblocking, as used in multilayer pipe string, needed for it, deblocking power is quite big, cannot deblocking risk increase severely, generally not in multiple fracturing tubing string adopt. The utilization of pretension deblocking spring simultaneously, it is to avoid in the process of going into the well, the fluctuation of down-hole pressure causes that unnecessary setting occurs in packing element, and causes the damage of packing element. It addition, be provided with limited step on its center pipe, it is to avoid bottom hole pressure difference is excessive causes the excessive movement of power slide block, it is prevented that packing element, by excessive condensation, causes fatigue to follow the string or breaks, impact sets effect.

In test uses, throttling packer operating tool string enters maximum 6 cubic meters per minute of formation flow rate; Use this packer, enter stratum liquid up to discharge capacities more than 10 cubic meters per minute, the sand-laden fluid body flow velocity when entering stratum by sanding machine only has the 3/5 of former speed simultaneously, alleviate the abrasion of the destruction to operating tool string and sand jet outlet, reduce potential safety hazard, improve equipment dependability and work efficiency.

Claims

1. un-throttled sets Y344 type fracturing packer, containing top connection, packing element, its center pipe, power slide block, spring center pipe, spring, Spring driving shell, hydraulic cavities, air chamber, sealing ring, it is characterized in that: outside top connection, be sequentially provided with three groups of packing elements and spacer ring, its end is connected to its center pipe, its center pipe outside power slide block, under connect spring center pipe, by its center pipe, the annular seal space that power slide block is constituted is called air chamber, by power slide block, its center pipe, the cavity that spring center pipe is constituted is hydraulic cavities, Spring driving head is connect under power slide block, it is provided with spring between Spring driving head and spring center pipe, its center pipe, spring center pipe, three groups of sealing rings it are provided with between power slide block.