CN115290311A

CN115290311A - Compression packer packing element performance detection device

Info

Publication number: CN115290311A
Application number: CN202210953641.3A
Authority: CN
Inventors: 王伟; 刘晓宾; 卓振洲; 邓永刚; 吴少路
Original assignee: Dripro Co ltd
Current assignee: Dripro Co ltd
Priority date: 2022-08-10
Filing date: 2022-08-10
Publication date: 2022-11-04

Abstract

The invention discloses a performance detection device for a compression packer rubber cylinder, which comprises a rubber cylinder testing unit and a rubber cylinder backset setting mechanism for setting the backset of the rubber cylinder. The compression type packer rubber cylinder performance detection device is provided with a packer rubber cylinder backspacing setting mechanism, and the backspacing of the packer rubber cylinder can be preset according to needs through the packer rubber cylinder backspacing setting mechanism; because the backset can be adjusted at will, the pressure-bearing capacity and the compression capacity of the rubber sleeve can be measured on the basis, and scientific basis is provided for the design of the rubber sleeve and the locking mechanism of the packer.

Description

Compression packer packing element performance detection device

Technical Field

The invention relates to the field of petroleum and natural gas sand prevention well completion, in particular to a rubber sleeve performance detection device of a compression packer.

Background

The packer is widely used in the fields of oil and gas field drilling, well completion, sand prevention, production and well repair, is important equipment in the field of oil exploitation, can be divided into a compression type and an expansion type by a conventional packer, a rubber sleeve is a core component of the packer, and the sealing performance of a rubber sleeve of the packer is a key for ensuring the success of the packer. The sealing performance of the packing element is affected by many factors, such as the chemical composition of the packing element material, the geometry of the packing element and its shoulder pad, the setting load, the ambient temperature, the nature of the fluid, etc.

Another important factor affecting the sealing performance of the packing element is the retraction amount of the locking mechanism of the packer, when the setting force of the packer reaches a set value and then the setting load is removed, the locking mechanism of the packer will retract to a certain extent, and the packing element correspondingly extends, so that the contact stress between the packing element and the inner wall of the casing pipe is reduced, and the sealing performance of the packing element is reduced. The characteristic of this kind of backspacing is to compress the packing element first, then the packing element stretches to certain length again, this has very big difference with directly compressing the packing element to this length, the latter directly makes the packing element have certain compression capacity, the former is that the packing element compresses first and then stretches to this compression capacity.

At present, researches on a packer rubber cylinder detection device mostly focus on the influence of factors such as setting load, temperature and compression amount (rubber cylinder stroke) on the performance of the rubber cylinder, and the influence of backset amount on the performance of the rubber cylinder is rarely involved. Although some detection devices are designed with locking devices, the backset of the locking devices is fixed and unadjustable, and different locking mechanisms have different backset; in actual research work, the influence of different backspacing quantities on the sealing performance of the rubber sleeve needs to be researched and measured, so that a better locking mechanism and a packer are designed.

The Chinese patent with the grant notice number CN103293062B discloses a test detection tool for a compression packer rubber cylinder, which can detect a plurality of types of rubber cylinders, improves the utilization rate of the tool, saves production cost, has the advantages of simple, reliable and accurate detection mode and the like, has a fixed locking mechanism, and can not adjust the back-off quantity.

The chinese patent with the grant publication number CN108414199B discloses a performance testing device for a visual packer rubber cylinder, which can realize the accurate measurement of 13 measurement operations of the rubber cylinder displacement, and specifically can accurately measure the setting distance of the rubber cylinder in the pressing process and the retraction distance of the rubber cylinder after pressure release; the rubber cylinder fatigue test can be realized, and a fixed locking mechanism is arranged, but the backset amount cannot be adjusted.

Disclosure of Invention

The invention aims to provide a compression type packer rubber sleeve performance detection device which is novel and unique in structure, convenient to use and capable of setting the retraction amount of a packer rubber sleeve; the specific technical scheme is as follows:

the device for detecting the performance of the compression packer rubber cylinder comprises a rubber cylinder testing unit and a rubber cylinder backset setting mechanism for setting the backset of the rubber cylinder.

Further, the rubber cylinder testing unit consists of a central pipe, a testing sleeve, a piston and a sealing plug; the testing sleeve is sleeved outside the central pipe, the front end of the central pipe is connected with the front end of the testing sleeve in a sealing manner, and the sealing plug is connected with the rear end of the testing sleeve to form a piston cavity of the piston; and a rubber cylinder testing cavity is arranged between the inner wall of the testing sleeve and the outer wall of the central pipe.

Further, the rubber barrel backset setting mechanism is a piston limiting mechanism which can be adjusted to limit the backset distance of the piston.

Further, the piston limiting mechanism is a limiting body, and the limiting body is connected with the tail end of the sealing plug through threads; the limiting body is provided with a limiting part for preventing the piston rod of the piston from retreating.

Further, the limiting body is an annular body provided with an internal thread matched with the external thread of the sealing plug, the limiting part is arranged at the tail end of the inner wall of the annular body, and the limiting part is a ring platform or a lug with the inner diameter smaller than the diameter of the piston rod.

The compression type packer rubber cylinder performance detection device is provided with a packer rubber cylinder backspacing setting mechanism, and the backspacing of the packer rubber cylinder can be preset according to needs through the packer rubber cylinder backspacing setting mechanism; because the backset can be adjusted at will, the pressure-bearing capacity and the compression capacity of the rubber sleeve can be measured on the basis, and scientific basis is provided for the design of the rubber sleeve and the locking mechanism of the packer; so as to improve the performance and reliability of the packer.

Drawings

FIG. 1 is a schematic structural view of a compression packer rubber cylinder performance detection device of the invention.

In the figure: 1. testing the casing; 2. A central tube; 3. pressing a ring; 4. A piston; 5. Sealing the plug; 6. Pressing the cap; 7. A seal ring; 8. A seal ring; 9. A seal ring; 10. A seal ring; 11. Installing a sleeve; 12. A glue cartridge assembly; 12-1, shoulder protection; 12-2, an outer rubber cylinder; 12-3, an inner rubber cylinder; 12-4, an outer rubber cylinder; 12-5, shoulder protection; 13. a seal ring; 13. a seal ring; A. front pressure testing holes; B. a rear pressure test hole; C. punching a hole; D. an end face; E. a water through hole; F. a bevel; G. an end face; l, the back-off reference value.

Detailed Description

The present invention will now be more fully described with reference to the following examples. This invention may, however, be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein.

For ease of description, spatially relative terms, such as "upper," "lower," "left," "right," and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatial terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "lower" can encompass both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

The device for detecting the performance of the compression packer rubber cylinder in the embodiment comprises a rubber cylinder testing unit; wherein, the rubber cylinder test unit can adopt various schemes in the prior art. In order to facilitate the research on the performance of the rubber cylinder under different backspacing conditions, a rubber cylinder backspacing setting mechanism is added in the embodiment; after the pressure is released by the rubber cylinder backset setting mechanism, the rubber cylinder is backset to a preset size. The rubber cylinder backspacing setting mechanism can be realized by a limiting mechanism which directly blocks the backspacing amplitude of the rubber cylinder; the compression mechanism can also be used for limiting the rubber cylinder to retreat to a preset size by blocking the retreat of the compression mechanism.

Embodiments may employ the structure shown in FIG. 1; the rubber cylinder testing unit mainly comprises a central pipe 2, a testing sleeve 1, a piston 4 and a sealing plug 5. A rubber cylinder testing cavity is arranged between the inner wall of the testing sleeve and the outer wall of the central pipe and used for accommodating a rubber cylinder or a rubber cylinder assembly 12 to be tested; and provides a space for the piston 4 to move.

The testing sleeve 1 is sleeved outside the central tube 2, and the front end of the inner hole of the testing sleeve 1 is provided with a limiting step for preventing the central tube 2 from passing out from the front side; the outer diameter of the front end of the central tube 2 is larger than the inner diameter of the limiting step.

The central tube 2 is provided with a first working surface, a second working surface and a third working surface which are coaxial and cylindrical in sequence from front to back. The first working surface is provided with a sealing groove and is hermetically connected with the inside of the test casing 1 through a sealing ring 13 in the sealing groove. The diameter of the second working surface is smaller than that of the first working surface, and the second working surface is used for installing a rubber cylinder or a rubber cylinder assembly 12 to be tested; the rubber sleeve component 12 sequentially comprises a shoulder protector 12-5, an outer rubber sleeve 12-4, an inner rubber sleeve 12-3, an outer rubber sleeve 12-2 and a shoulder protector 12-1 from front to back.

The piston rod of the piston 4 is tubular and lighter than a solid piston rod.

The third working surface is matched with the inner wall of the piston rod, and the diameter of the third working surface is smaller than that of the second working surface to form a step.

And a lead angle F is arranged at one end of the second working surface connected with the third working surface, so that the rubber cylinder component 12 is prevented from being scratched during installation, and smooth installation is facilitated.

In order to be basically consistent with the use environment, a compression ring 3 is also arranged; the glue cartridge assembly 12 is mounted in place by the press ring 3. The length of the second working surface should be greater than the length of the rubber cylinder component 12, and enough margin is left, and the length of the mounting sleeve 11, that is, the maximum movable distance of the compression ring 3, must be greater than the maximum compressible distance of the rubber cylinder component, so as to ensure that the rubber cylinder component can be sufficiently compressed.

The bottom of the central tube 2 is provided with a step surface; the central tube 2 can be easily separated from the test socket 1 by means of the end face D of the step face.

In order to facilitate the installation of the rubber cylinder assembly 12, an installation sleeve 11 is further arranged, and the inner wall of the installation sleeve is in clearance fit with the third working surface; the outer wall is in clearance fit with the inner wall of the glue cartridge assembly 12.

Be provided with limbers E between the inner wall of clamping ring 3 and the outer wall, when piston 4 promoted clamping ring 3 extrusion packing element subassembly 12, in time discharged the liquid between inner wall and the third working face.

The testing sleeve 1 is provided with a front pressure testing hole A and a rear pressure testing hole B; the front pressure test hole A is communicated with the front end of the rubber cylinder test cavity; the position of the rear pressure testing hole B should exceed the rear end of the rubber cylinder component 12; the front pressure test hole A and the rear pressure test hole B are used for testing the packing effect of the rubber cylinder component 12 in a pressed state.

The sealing plug 5 is fixedly connected with the rear end of the test sleeve 1 through threads, and the joint is sealed through a sealing ring 8. The piston cavity of the piston 4 is enclosed by the sealing plug 5, the testing sleeve 1 and the central tube 2. A driving cavity is formed between the rear end face of the piston 4 and the sealing plug 5, the sealing plug 5 is provided with a pressurizing hole C which is communicated with the driving cavity, and the piston 4 is driven to move forwards by pressurization. The sealing plug 5 is connected with the outer wall of the piston rod in a sealing and sliding mode through a sealing ring 7. The outer edge of the piston 4 is in sealed sliding connection with the inner wall of the test sleeve 1 through a sealing ring 9; the inner edge of the piston 4 is in sealing sliding connection with the third working surface through a sealing ring 10.

The limiting body is an annular body pressing cap 6 provided with an internal thread matched with the external thread of the sealing plug 5 and used as a limiting body; the pressing cap 6 is connected with the tail end of the sealing plug 5 through threads; the pressing cap 6 is provided with an annular limiting part for preventing the piston rod of the piston 4 from retreating. A projection may be used to prevent the piston rod of the piston 4 from backing. The operation is more convenient by adopting an external connection mode.

An internal connection mode can also be adopted, and a plug is matched with the internal thread at the tail part of the sealing plug 5 to prevent the piston rod of the piston 4 from retreating.

Other piston limiting mechanisms with adjustable set distance can be used as the setting mechanism of the rubber cylinder backset. The retreating distance of the piston rod of the piston 4 can be limited by adopting a pin and pin hole matching mode; and will not be described in detail herein.

When doing benefit to compression packer packing element performance detection device in this embodiment and detecting, install installation cover 11 earlier on the center tube 2 that is equipped with sealing washer 13, conveniently install packing element subassembly 12 in proper order from the rear end, then, take off installation cover 11, install clamping ring 3 on center tube 2, pack center tube 2 together with packing element subassembly 12 and clamping ring 3 into test sleeve 1. Next, the seal ring 9 and the seal ring 10 are mounted on the piston 4, and then the piston 4 is fitted into the annular space of the center tube 2 and the test sleeve 1. Installing a sealing ring 7 and a sealing ring 8 on a sealing plug 5, installing the sealing plug 5 on a test sleeve 1 through threads, and finally installing a pressing cap 6 on the sealing plug 5 until the rear end face of a piston 4 leans against the end face G of an inner hole of the pressing cap 6; a reference surface may be provided at the sealing plug 5, and the distance between the front end surface of the pressing cap 6 and the reference surface is the back-off reference value L.

Recording an initial retraction size L0 before setting, pressing to a preset setting pressure through a pressing hole C during setting, moving a piston 4 forwards, compressing a rubber cylinder assembly 12 through a pressing ring 3, separating the rear end of the piston 4 from an end surface G of an inner hole of a pressing cap 6, rotating the pressing cap 6 clockwise at the moment, enabling the rear end surface of the piston 4 to lean against the end surface G of the inner hole of the pressing cap 6 again, and reducing the initial retraction size L0 to a fully compressed size L1; the retraction amount of the glue cylinder assembly is 0. The pressing cap 6 can be rotated counterclockwise at this time to adjust the set retraction amount of the glue cartridge assembly. The adjusting method comprises the steps of rotating the pressing cap 6 anticlockwise appropriately, then relieving pressure, and under the action of resilience force of the rubber cylinder assembly, enabling the rear end face of the piston 4 to always lean against the end face G of the inner hole of the pressing cap 6, so that the full-compression size L1 is increased to be the set retraction size L2, the difference between the set retraction size L2 and the full-compression size L1 is the retraction amount of the rubber cylinder assembly, and the difference between L0 and L2 is the actual compression amount of the rubber cylinder assembly.

At this time, the packing element assembly is still in a compressed state, and an annular space formed by the second working surface of the central tube 2 and the cylindrical surface with the largest inner diameter of the test casing is separated by the packing element assembly 12. Keeping the hole A open, pressing the hole B, measuring the capacity of the rubber cylinder assembly for bearing the lower pressure difference under the backspacing, keeping the hole B open, pressing the hole A, measuring the capacity of the rubber cylinder assembly for bearing the upper pressure difference under the backspacing, adjusting the set backspacing, retesting, and obtaining the capacity of the rubber cylinder assembly for bearing the upper and lower pressure differences under different set backspacing. And releasing pressure after the test is finished.

When the device is disassembled, the pressure can be firstly applied to the hole C, the pushing force of the piston 4 to the pressing cap 6 caused by the resilience force of the rubber cylinder component is reduced, the pressing cap 6 is disassembled, and the pressure is released; and then the sealing plug 5 is detached, the piston 4 is taken out, and finally, a stick with proper diameter is used for pushing the end face D from the inner hole at the front end of the central tube 2, and the central tube 2, the rubber cylinder component 12 and the compression ring 3 are withdrawn from the test sleeve 1.

The invention has the advantages that the capability of bearing the upper and lower pressure difference of the rubber cylinder component under different backspacing amounts can be measured, and the compression amount of the rubber cylinder component is measured simultaneously, thereby providing scientific basis for designing the rubber cylinder component and the packer.

The above examples are only for illustrating the present invention, and besides, there are many different embodiments, which can be conceived by those skilled in the art after understanding the idea of the present invention, and therefore, they are not listed here.

Claims

1. The device for detecting the performance of the compression packer rubber barrel comprises a rubber barrel testing unit and is characterized by further comprising a rubber barrel backset setting mechanism for setting the backset of the rubber barrel.

2. The compression packer rubber performance detection device of claim 1, wherein the rubber testing unit comprises a central tube, a test sleeve, a piston and a sealing plug; the testing sleeve is sleeved outside the central tube, the front end of the central tube is hermetically connected with the front end of the testing sleeve, and the sealing plug is connected with the rear end of the testing sleeve to form a piston cavity of the piston; and a rubber cylinder testing cavity is arranged between the inner wall of the testing sleeve and the outer wall of the central pipe.

3. The compression packer rubber performance testing apparatus of claim 2, wherein the rubber setting means is a piston limit stop means that is adjustable to limit the piston retraction distance.

4. The compression packer rubber performance detection device of claim 3, wherein the piston limiting mechanism is a limiting body, and the limiting body is in threaded connection with the tail end of the sealing plug; the limiting body is provided with a limiting part for preventing the piston rod of the piston from retreating.

5. The compression packer rubber performance detection device of claim 4, wherein the limiting body is an annular body provided with an internal thread adapted to the external thread of the sealing plug, the limiting portion is provided at the end of the inner wall of the annular body, and the limiting portion is a ring platform or a bump having an inner diameter smaller than the diameter of the piston rod.