CN110259408A - A kind of oil/gas well packing completion system - Google Patents

Abstract

The invention relates to an oil and gas well isolation and completion device that adopts a splicing design of double setting pistons, which ensures high setting force and realizes a large diameter at the same time. Moreover, when unsealing, it only needs to be lifted up. More convenient; in addition, the first O-ring, the second O-ring, the third O-ring, the fourth O-ring and the fifth O-ring are all arranged on the bottom of the rubber cartridge assembly side, so that the oil and gas well isolation and completion device can be sealed off due to the aging of the first O-ring and the like during the pressure setting process of the completion string.

Description

An oil and gas well isolation and completion device

technical field

The invention relates to the technical field of oil and gas well operation, and more specifically relates to an oil and gas well isolation and completion device.

Background technique

At present, ultra-deep oil and gas wells are an important means for the efficient development of oil and gas reservoirs in Northwest China. They have high production, but there are problems such as high bottom hole temperature, high formation pressure and high well control risk. Therefore, Chaoshen oil and gas wells generally use small wells Completion method of eye completion. Moreover, for the slim hole completion method, although the slim hole optional completion isolation device can effectively realize the slim hole casing isolation and completion, it has a large tool diameter, and the throttling effect is obvious in the later stimulation process. ; The tools have defects such as low temperature resistance and compressive strength, which affect the construction depth.

Contents of the invention

In order to overcome the deficiencies of the prior art, the technical problem to be solved by the present invention is to provide an oil and gas well isolation and completion device, which can not only effectively isolate the oil and gas well casing annulus, but also can withstand high temperature and high pressure. , to provide guarantee for the use of ultra-deep oil and gas wells.

In order to solve the problems of the technologies described above, the content of the technical solution adopted in the present invention is specifically as follows:

An oil and gas well isolation and completion device, comprising an upper mandrel and a lower mandrel connected to the upper mandrel, the outer side of the upper mandrel is sequentially sleeved with a pressure ring, an upper slip assembly, and an upper cone , a rubber cartridge assembly, a lower cone, a lower slip assembly and a piston, the outer side of the lower mandrel is sequentially sleeved with a liquid cylinder, a setting mandrel and a lower joint; the upper mandrel is threadedly connected with the upper joint, The upper slip assembly is connected to the upper mandrel through the first shear pin; the upper cone is connected to the upper slip assembly through the second shear pin; the upper cone is connected to the upper mandrel through the first gauge ring. The upper mandrel, the lower cone is connected to the upper mandrel through the second gauge ring; the lower cone is connected to the lower slip assembly through the third shear pin; the setting mandrel is connected through the fourth The shear pin is connected to the hydraulic cylinder, and the setting mandrel is connected to the lower joint through the fifth shear pin

As a preference of the above scheme, the upper slip assembly includes an upper slip cylinder, an upper slip is arranged in a slot of the upper slip cylinder, and an upper slip is arranged between the upper slip and the upper slip cylinder. There is an upper slip spring; the lower slip assembly includes a lower slip cylinder, and a lower slip is arranged in a slot of the lower slip cylinder, and the upper slip cylinder is connected to the upper slip cylinder through a first shear pin. The upper slip cylinder is connected to the upper cone through the second shear pin, and the lower slip cylinder is connected to the lower cone through the third shear pin.

As a preference of the above solution, the rubber cartridge assembly includes a first end rubber cartridge, a second end rubber cartridge, and a middle rubber cartridge arranged between the first end rubber cartridge and the second end rubber cartridge, the The rubber sleeve at the first end, the rubber sleeve at the second end, and the middle rubber sleeve are all sleeved on the upper mandrel, and the rubber sleeve at the first end is connected to the first gauge ring by means of bolts, the The rubber cylinder at the second end passes through the second gauge ring of the bolt device.

As a preference of the above scheme, the outer side of the setting mandrel is covered with a locking sleeve and an unsealing outer cylinder fixedly connected with the locking sleeve, the locking sleeve is connected to the setting mandrel through a lower locking ring, and The lock sleeve is connected to the hydraulic cylinder through the fourth shear pin.

As a preference of the above solution, the outer sleeve of the lower joint is provided with an unseal sleeve, and the unseal sleeve is connected to the lower joint through a fifth connecting pin.

As a preference of the above solution, a clasp is provided between the unpacking sleeve and the lower joint.

As a preference of the above solution, it further includes a positioning ring arranged between the upper joint and the upper slip assembly, and the positioning ring is sleeved on the outer side of the upper mandrel through a bolt device.

As a preference of the above solution, it also includes a dustproof ring arranged between the positioning ring and the upper slip assembly, and the positioning ring is provided with a first upper side for accommodating the dustproof ring. A groove, the upper slip assembly is provided with a second groove for accommodating the lower side of the dust ring.

As a preference of the above solution, a first O-ring sealing ring is arranged between the piston and the upper mandrel; a second O-ring sealing ring is arranged between the piston and the hydraulic cylinder.

As a preference of the above solution, a third O-ring is provided between the setting mandrel and the lower mandrel; a fourth O-ring is provided between the setting mandrel and the unsealing outer cylinder. Sealing ring; a fifth O-ring sealing ring is arranged between the unsealing outer cylinder and the lower joint.

Compared with prior art, the beneficial effect of the present invention is:

1. The oil and gas well isolation and completion device disclosed in the present invention adopts a splicing design of double setting pistons, which ensures a high setting force and realizes a large diameter at the same time. Moreover, when unsealing, it only needs to be lifted up , more convenient.

2. The oil and gas well isolation and completion device disclosed in the present invention includes the first O-ring, the second O-ring, the third O-ring, the fourth O-ring and the fifth O-ring, etc. They are all arranged on the lower side of the rubber cartridge assembly, so that the oil and gas well isolation and completion device can prevent the failure of the completion string caused by the aging of the first O-ring and the like during the pressure setting process of the oil and gas well.

The above description is only an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention, it can be implemented according to the contents of the description, and in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable , the following preferred embodiments are specifically cited below, and are described in detail as follows in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is the structural representation of oil and gas well isolation completion device of the present invention;

Wherein, the reference numerals in Fig. 1 are:

1. Upper joint; 2. Upper mandrel; 3. Locating ring; 4. Dustproof ring; 5. Pressure ring; 6. Upper slip tube; 7. Upper slip spring; 8. Upper slip; 9. Upper Cone; 10, the first gauge ring; 11, the first rubber tube; 12, the middle rubber tube; 13, the lower cone; 14, the upper lock ring; 15, the lower slip; 16, the lower slip tube; 17 , piston; 18, liquid cylinder; 19, lower mandrel; 20, lock sleeve; 21, lower lock ring; 22, setting mandrel; 23, unsealing outer cylinder; 24, lower joint; 25, snap ring; 26 , unpacking sleeve; 27, the second gauge ring; 28, the first shear pin; 29, the third shear pin; 30, the fifth shear pin; 31, the first O-ring; 32, the second O-shaped Sealing ring; 33, the second end rubber tube.

Detailed ways

In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described in detail with reference to the accompanying drawings.

As shown in Figure 1, the present invention discloses an oil and gas well isolation and completion device, which includes an upper mandrel 2 and a lower mandrel 19 connected to the upper mandrel 2, and the outer sides of the upper mandrel 2 are successively A pressure ring 5, an upper slip assembly, an upper cone 9, a rubber cartridge assembly, a lower cone 13, a lower slip assembly and a piston 17 are socketed, and the outer side of the lower mandrel 19 is sequentially socketed with a hydraulic cylinder 18, The setting mandrel 22 and the lower joint 24; the upper mandrel 2 is threadedly connected with the upper joint 1, and the upper slip assembly is connected to the upper mandrel 2 through the first shear pin 28; the upper cone 9 is connected to the upper slip assembly through the second shear pin; the upper cone 9 is connected to the upper mandrel 2 through the first gauge ring 10, and the lower cone 13 is connected to the The upper mandrel 2; the lower cone 13 is connected to the lower slip assembly through the third shear pin 29; the setting mandrel 22 is connected to the hydraulic cylinder 18 through the fourth shear pin, and the setting The mandrel 22 is connected to the lower joint 24 through a fifth shear pin; moreover, an upper locking ring 14 is provided between the lower cone 13 and the upper mandrel 2 .

Since the oil and gas well isolation and completion device includes an upper slip assembly and a lower slip assembly, which adopts a double-sealing piston splicing design, the oil and gas well isolation and completion device achieves a large-pass effect, thereby ensuring The diameter of the oil and gas well isolation and completion device and the oil pipe are consistent during the connection process, which effectively avoids the phenomenon that the oil and gas well isolation and completion device is set in advance due to the choke pressure difference caused by diameter change.

Specifically, the upper slip assembly includes an upper slip cylinder 6, an upper slip 8 is arranged in a slot of the upper slip cylinder 6, and the upper slip 8 and the upper slip cylinder 6 An upper slip spring 7 is arranged between them; the lower slip assembly includes a lower slip cylinder 16, and a lower slip 15 is arranged in the slot of the lower slip cylinder 16, and the upper slip cylinder 6 passes through the first The shear pin 28 is connected to the upper mandrel 2, the upper slip cylinder 6 is connected to the upper cone 9 through the second shear pin, and the lower slip cylinder 16 is connected through the third shear pin 29 The lower cone 13.

The rubber cartridge assembly includes a first end rubber cartridge 11, a second end rubber cartridge 33, and a middle rubber cartridge 12 arranged between the first end rubber cartridge 11 and the second end rubber cartridge 33. The rubber cylinder 11 at one end, the rubber cylinder 33 at the second end and the rubber cylinder 12 at the second end are all sleeved on the upper mandrel 2, and the rubber cylinder 11 at the first end is connected to the first gauge through the bolt device. ring 10, the second end rubber cylinder 33 passes through the second gauge ring 27 of the bolt device; moreover, the first end rubber cylinder 11 and the second end rubber cylinder 33 have a certain protective effect.

Specifically, the size of the first gauge ring 10 is larger than the size of the first end rubber tube 11, and the size of the second gauge ring 27 is larger than the size of the second end rubber tube 33, so that the first There is no gap between the first end rubber tube 11 and the upper mandrel 2 by a gauge ring 10, and the second end rubber tube 33 is connected to the upper mandrel 2 by the second gauge ring 27. There is no gap between them to achieve a fixed seal of the cartridge assembly.

The outer side of the setting mandrel 22 is covered with a lock sleeve 20 and an unsealing outer cylinder 23 fixedly connected with the lock sleeve 20, the lock sleeve 20 is connected to the setting mandrel 22 through a lower lock ring 21, And the lock sleeve 20 is connected to the hydraulic cylinder 18 through the fourth shear pin.

The outer side of the lower joint 24 is covered with an unsealing sleeve 26 , and the unsealing sleeve 26 is connected to the lower joint 24 through a fifth connecting pin 30 .

A clasp 25 is provided between the unsealing sleeve 26 and the lower joint 24 , so that the unsealing sleeve 26 can be limited by the clasp 25 .

As a preferred embodiment, the oil and gas well isolation and completion device further includes a positioning ring 3 arranged between the upper joint 1 and the upper slip assembly, and the positioning ring 3 is sleeved on the upper slip assembly through a bolt device. The outer side of the above-mentioned mandrel 2.

As a preferred embodiment, the oil and gas well isolation and completion device further includes a dustproof ring 4 arranged between the positioning ring 3 and the upper slip assembly, and the positioning ring 3 is provided with a The first groove on the upper side of the dustproof ring 4, the upper slip assembly is provided with a second groove for accommodating the lower side of the dustproof ring 4, specifically, the second The groove is arranged on the pressure ring 5. When connecting, the upper side of the dust-proof ring 4 is inserted into the first groove, and the lower side of the dust-proof ring 4 is inserted into the first groove. Two grooves, so that the dustproof ring 4 can be fixed on the outer side of the upper mandrel 2 through the positioning ring 3 and the pressure ring 5 .

A first O-ring seal 31 is disposed between the piston 17 and the upper mandrel 2 ; a second O-ring seal 32 is disposed between the piston 17 and the hydraulic cylinder 18 .

A third O-ring seal is provided between the setting mandrel 22 and the lower mandrel 19 , and a fourth O-ring is provided between the setting mandrel 22 and the unsealing outer cylinder 23 ; A fifth O-ring is provided between the unsealing outer cylinder 23 and the lower joint 24 .

Since the first O-ring seal 31, the second O-ring seal 32, the third O-ring seal, the fourth O-ring seal and the fifth O-ring seal are all arranged on the lower side of the rubber cartridge assembly, In this way, the oil and gas well isolation and completion device can be prevented from being unsealed in the completion string due to the aging of the first O-ring 31 and the like during the pressurization and setting process.

In addition, in order to ensure that the oil and gas well isolation and completion device has high temperature resistance and pressure resistance, the first O-ring seal 31, the second O-ring seal 32, the third O-ring seal, the first O-ring The four O-rings and the fifth O-ring are made of CHEMRAZ perfluoroether, which can withstand high temperature of 204°C and pressure of 105MPa.

During setting, the high-pressure liquid pressure acts on the end face of the setting mandrel 22 through the hole of the lower mandrel 19, presses and shears the fourth shear pin, and the hydraulic cylinder 18 moves upward and pushes the piston 17 Move towards the direction close to the positioning ring 3; then, press and cut off the first shear pin 28, the dustproof ring 4 will push the positioning ring 3, and make the dustproof ring 4 expand and stretch , at this time, the upper slip cylinder 6 moves upwards to the limit step of the upper mandrel 2; next, the second shear pin is pressed and cut, and the upper cone 9 continues to move upwards and spread apart The upper slip 8; Next, press and cut the third shear pin 29, at this time the piston 17 will continue to push the lower cone 13 to move upwards, and then push the middle rubber cylinder 12 Expansion and expansion and the lower slip 15 is expanded and anchored, and set in the casing of the oil and gas well;

When the setting is released, the tubing is depressurized, the tubing string connected to the upper part of the oil and gas well isolation and completion device is lifted up, and then the fifth shear pin 30 is cut. At this time, the upper mandrel 2 and the The lower mandrel 19 moves upward at the same time, and at the same time respectively drives the upper slip cylinder 6 and the lower slip cylinder 16 to move upward, and then the upper slip spring 7 makes the upper slip 8 shrink, and at the same time, The middle rubber tube 12 shrinks and releases the anchor.

It should be noted that, in the description of the present invention, the terms "first", "second", "third", "fourth" and "fifth" are used for descriptive purposes only, and should not be interpreted as indications or imply relative importance.

Embodiments of the present invention have been described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementations, and the above-mentioned specific implementations are only illustrative, rather than restrictive, and those of ordinary skill in the art will Under the enlightenment of the present invention, many forms can also be made without departing from the gist of the present invention and the protection scope of the claims, and these all belong to the protection of the present invention.

Claims (10)

1. a kind of oil/gas well insulates completion system, it is characterised in that: under being connected including upper mandrel and with the upper mandrel Mandrel, the outside of the upper mandrel are successively socketed with pressure ring, upper slips component, upper cone, packing element component, lower cone, lower slips Component and piston, the outside of the lower mandrel are successively socketed with fluid cylinder, set mandrel and lower contact；The upper mandrel with above connect Head thread connects, and the upper slips component passes through upper mandrel described in the first shearing pin connection；The upper cone passes through the second shearing Upper slips component described in pin connection；The upper cone connects the upper mandrel by the first rule ring, and the lower cone passes through second It advises ring and connects the upper mandrel；The lower cone shears lower slips component described in pin connection by third；The mandrel that sets leads to Fluid cylinder described in the 4th shearing pin connection is crossed, the mandrel that sets passes through lower contact described in the 5th shearing pin connection.

2. oil/gas well according to claim 1 insulates completion system, it is characterised in that: the upper slips component includes upper card Watt cylinder is provided with upper slips in the card slot of the upper slips cylinder, and is provided between the upper slips and the upper slips cylinder Upper slips spring；The lower slips component includes lower slips cylinder, is provided with lower slips in the card slot of the lower slips cylinder, it is described on Slips cylinder passes through epicone described in the second shearing pin connection by upper mandrel described in the first shearing pin connection, the upper slips cylinder Body, the lower slips cylinder shear lower cone described in pin connection by third.

3. oil/gas well according to claim 2 insulates completion system, it is characterised in that: the packing element component includes first end Packing element, second end packing element and the middle packing element being arranged between the first end packing element and the second end packing element, described first End packing element, the second end packing element and the middle packing element are set on the upper mandrel, and the first end packing element is logical The first rule ring described in bolt device is crossed, the second end packing element passes through the second rule ring described in bolt device.

4. oil/gas well according to claim 1 insulates completion system, it is characterised in that: described set is arranged on the outside of mandrel The deblocking outer cylinder for having lock tube and being fixedly connected with the lock tube, the lock tube by lower lock ring connect described in set mandrel, and And the lock tube passes through fluid cylinder described in the 4th shearing pin connection.

5. oil/gas well according to claim 1 insulates completion system, it is characterised in that: the outer sheath of the lower contact is equipped with Big envelope is solved, the solution big envelope passes through lower contact described in the 5th connection pin connection.

6. oil/gas well according to claim 5 insulates completion system, it is characterised in that: the solution big envelope and the lower contact Between be provided with snap ring.

7. oil/gas well according to claim 1 insulates completion system, it is characterised in that: further include being arranged in the top connection With the positioning ring between the upper slips component, the positioning ring is socketed in the outside of the upper mandrel by bolt device.

8. oil/gas well according to claim 7 insulates completion system, it is characterised in that: further include being arranged in the positioning ring With the dust ring between the upper slips component, and the positioning ring is provided with the upper side edge for accommodating the dust ring First groove, the upper slips component are provided with the second groove of the lower side for accommodating the dust ring.

9. oil/gas well described in -8 any one insulates completion system according to claim 1, it is characterised in that: the piston and institute It states and is provided with the first O-ring seals between mandrel；The second O-ring seals are provided between the piston and the fluid cylinder.

10. oil/gas well according to claim 5 or 6 insulates completion system, it is characterised in that: it is described set mandrel with it is described Third O-ring seals are provided between lower mandrel；Described set is provided with the sealing of the 4th O shape between mandrel and the deblocking outer cylinder Circle；The 5th O-ring seals are provided between the deblocking outer cylinder and the lower contact.