CN213710981U

CN213710981U - Multilayer separate production compensator for thermal production well

Info

Publication number: CN213710981U
Application number: CN202022330128.8U
Authority: CN
Inventors: 范喜群; 马宏伟; 范钰玮; 王泊; 秦世群; 王文涛; 张景辉; 王小勇
Original assignee: China Petroleum and Chemical Corp; Petroleum Engineering Technology Research Institute of Sinopec Henan Oilfield Branch Co
Current assignee: China Petroleum and Chemical Corp; Petroleum Engineering Technology Research Institute of Sinopec Henan Oilfield Branch Co
Priority date: 2020-10-19
Filing date: 2020-10-19
Publication date: 2021-07-16
Anticipated expiration: 2030-10-19

Abstract

The utility model relates to an oil field development oil recovery instrument field has especially related to a compensator is separately produced to thermal recovery well multilayer. The compensator comprises a central pipe and an outer sleeve component, wherein an upper joint is arranged at the upper end of the central pipe; the outer sleeve component comprises a lower joint; the lower end of the central tube is inserted into the inner cavity of the outer sleeve component and is in anti-falling fit with the outer sleeve component, and a sealing structure is arranged at the fit position of the outer sleeve component and the central tube and is used for being in sealing fit with the central tube when the central tube slides up and down relative to the outer sleeve component; and a supporting device is arranged between the central pipe and the outer sleeve component, is positioned above the sealing structure, is used for limiting the axial relative position of the central pipe and the outer sleeve component, and can be softened or melted when the temperature reaches a set value. The utility model discloses a can receive temperature control's strutting arrangement, when guaranteeing compensator compensation function, the problem of the biggest extension position of compensator when having solved current flexible compensator and can't guarantee to go into the well.

Description

Multilayer separate production compensator for thermal production well

Technical Field

The utility model relates to an oil field development oil recovery instrument field has especially related to a compensator is separately produced to thermal recovery well multilayer.

Background

The thermal recovery and layered steam injection of the thick oil is an effective important method for improving the recovery efficiency of the thick oil recovery. The layered steam injection technology is characterized in that a mechanical sealing function of a packer is utilized to divide a steam injection unit for an oil reservoir, and steam injection allocation is reasonably carried out on each steam injection layer, so that mutual interference among steam injection layers is reduced, a steam absorption profile is improved, and the steam injection development efficiency is improved. Because the tubular column is heated and expanded in the steam injection process, the tubular column between the packers is easy to generate thermal stress compression deformation, thereby causing the packers to lose efficacy and influencing the layered steam injection effect. The steam injection pipe column is easy to block the packer due to sand production of an oil layer, so that the packer is difficult to unseal. The telescopic compensator used in China at present has poor using effect aiming at layered steam injection and influences the thermal recovery effect. The specification of patent application with application publication number CN106223868A and publication date 2016, 12, month and 14 discloses a thermal production well steam injection pipe column expansion compensator, the structure of the pipe column telescopic compensator is shown in figure 1, and comprises a first component consisting of an upper joint 1, a central pipe 2 and a limiting ring 3, and a second component consisting of a press sealing head 4, an adjusting seat 5, an adjusting cylinder 6, an outer sleeve 7, a connecting piece 8 and a lower joint 9, wherein the center of the second component forms a jack into which the center tube 2 of the first component is inserted from top to bottom, the limiting ring 3 is matched with the lower end of the adjusting seat 5 of the second component in a stopping way, so that the first component and the second component are assembled together and cannot be axially separated, a corresponding sealing component 10 is arranged at the insertion matching position of the first component and the second component, so that the sealing of the matching position is ensured. The first component and the second component can slide relatively, when the packer is used, the upper joint 1 and an oil pipe can be connected together, the lower joint 9 and the pipe column are fixed, the second component integrally moves downwards under the action of gravity until stopped by the limiting ring 3, the telescopic compensator is stretched to the longest, after the packer is sealed, the pipe column expands due to heating and pushes the second component to move upwards when steam is injected, so that the telescopic compensator is gradually compressed, the underground temperature gradually decreases after the steam is injected, the pipe column contracts due to cooling, the second component moves downwards again, so that the telescopic compensator is gradually stretched, the telescopic tension generated by heating or cooling of the pipe column can be compensated, the purposes of stretching during steam injection and retracting during steam stop are achieved, and the problem that the packer cannot be used to achieve real layered steam injection in the steam injection process is solved.

However, the telescopic compensator cannot ensure the maximum extension position of the compensator when the well is lowered, and when the packer is blocked or cannot be unsealed during later construction, the tubular column above the compensator cannot be taken out.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a compensator is adopted to thermal recovery well multilayer branch to solve the problem of the biggest extension position of compensator when current flexible compensator can't guarantee to go into the well.

The utility model discloses a compensator is adopted to thermal recovery well multilayer branch: the multilayer separate production compensator for the thermal production well comprises a central pipe, wherein an upper joint is arranged at the upper end of the central pipe;

an outer jacket assembly including a lower joint at a lower end;

the lower end of the central tube is inserted into an inner cavity of the outer sleeve component and is in anti-falling fit with the outer sleeve component, and a sealing structure is arranged at the fit position of the outer sleeve component and the central tube and is used for being in sealing fit with the central tube when the central tube slides up and down relative to the outer sleeve component;

and a supporting device is arranged between the central pipe and the outer sleeve component, is positioned above the sealing structure, is used for limiting the axial relative position of the central pipe and the outer sleeve component, and can be softened or melted when the temperature reaches a set value.

Has the advantages that: the utility model discloses an among the compensator is adopted separately to heat production well multilayer, because be provided with between center tube and the outer cover subassembly strutting arrangement to strutting arrangement can soften or the melting when the temperature reaches the setting value, thereby can be at the in-process of going into the well, through strutting arrangement's support, makes the compensator be in the maximum extension position, and when well to preset position, the packer sits and seals the back, to intraductal steam injection of cover, and when the temperature rose, strutting arrangement softened or the melting and lost the supporting role, thereby satisfies the flexible compensation requirement of compensator. The utility model discloses a can receive temperature control's strutting arrangement, when guaranteeing compensator compensation function, the problem of the biggest extension position of compensator when having solved current flexible compensator and can't guarantee to go into the well.

Furthermore, the supporting device can melt when the temperature reaches a set value, and the outer cylinder protecting assembly is provided with a discharge port for discharging the melted supporting device. Because the supporting device only plays a role when the oil pipe goes into the well, the meltable supporting device is selected, and the discharge port is arranged on the outer casing assembly, the supporting device can be thoroughly disposed when not needed, and the expansion and contraction of the compensator are prevented from being influenced.

Further, the discharge ports are plural and distributed around the circumference of the outer sleeve assembly. The plurality of discharge openings can increase the discharge speed of the melt from the support device on the one hand, and can discharge the melt from the support device from multiple directions on the other hand, thereby facilitating the complete emptying of the melt.

Furthermore, the supporting device is made of polyethylene. The polyethylene can meet the functional requirements of the support device and has the advantage of low cost.

Furthermore, the supporting device is a supporting cylinder, and the supporting cylinder is sleeved outside the central tube. The supporting cylinder is used as a supporting device, and the supporting device has the advantages of being stable in supporting and convenient to install.

Furthermore, an upper baffle ring is fixedly arranged on the outer wall of the central tube, and the upper end of the supporting device is matched with the lower end of the upper baffle ring. Above keep off ring and strutting arrangement cooperation, the strutting arrangement of being convenient for on the one hand, on the other hand simple structure.

Further, the upper baffle ring is in threaded fit with the central tube. The upper baffle ring and the central pipe adopt a split structure in threaded fit, and the split structure has the advantage of convenience in processing.

Furthermore, an upward step surface is arranged on the inner wall of the lower joint, the sealing structure is a sealing gasket arranged on the step surface, and the sealing gasket is fixedly pressed by a lower retaining ring assembled on the lower joint through threads. The step surface facilitates the arrangement of a sealing structure and has the advantage of simple structure.

Furthermore, a pressing ring is arranged in front of the lower retaining ring and the sealing gasket. Because the retaining ring can rotate for the lower clutch when the installation down, the clamping ring separates sealed pad and retaining ring down, can play the sealed effect of filling up of protection.

Furthermore, the outer protective sleeve assembly comprises a lifting ring positioned at the upper end, the lifting ring is provided with an inner edge extending inwards, the central tube is stopped from moving upwards through the inner edge, when the upward force applied to the central tube reaches a set value, the inner edge can be broken, and the central tube can be separated from the lifting ring. Through the inner edge blocking central pipe capable of being broken, when the packer is blocked or cannot be unsealed in later construction, the central pipe can be lifted, and the central pipe is pulled off at the lifting ring, so that the oil pipe above the telescopic compensator is lifted out, and then underground falling objects are fished.

Drawings

FIG. 1 is a schematic structural diagram of a self-sealing compression packer in the prior art;

fig. 2 is a schematic structural diagram of an embodiment 1 of the thermal production well multi-layer separate production compensator of the present invention;

FIG. 3 is an enlarged partial view of an upper portion of the thermal production well multi-zone production compensator of FIG. 2;

FIG. 4 is an enlarged partial view of a lower portion of the thermal production well multi-zone production compensator of FIG. 2;

fig. 5 is a schematic structural view of the lower retainer ring of fig. 2.

In fig. 1: 1-upper joint, 2-central tube, 3-spacing ring, 4-pressure sealing head, 5-adjusting seat, 6-adjusting cylinder, 7-outer sleeve, 8-connecting piece, 9-lower joint and 10-sealing component.

In fig. 2: 11-central tube, 111-upper joint, 12-supporting device, 13-lifting hanging ring, 131-inner edge, 14-protective sleeve, 141-discharge port, 15-lower joint, 16-sealing gasket, 17-lower retaining ring, 18-pressure ring and 19-upper retaining ring.

In fig. 3: 11-central tube, 111-upper joint, 12-supporting device, 13-lifting hanging ring, 131-inner edge, 14-protective sleeve, 19-upper retaining ring.

In fig. 4: 11-central tube, 12-support device, 14-protective sleeve, 141-discharge port, 15-lower joint, 16-sealing gasket, 17-lower retaining ring, 171-square groove and 18-pressure ring.

In fig. 5: 17-lower retaining ring, 171-square groove.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention, i.e., the described embodiments are only some, but not all embodiments of the invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Example 1:

as shown in fig. 2-5, the thermal production well multi-zone production compensator comprises an outer jacket assembly, a central pipe 11 and a support device 12.

The outer protective barrel component comprises a lifting ring 13, a protective sleeve 14 and a lower joint 15 which are sequentially arranged from top to bottom.

The lifting ring 13 is used for installing the protecting sleeve 14 and the lower joint 15, and when the central tube 11 is lifted upwards, the outer sleeve assembly can be lifted integrally through the lifting ring 13. From the outer contour, the bail 13 is divided into two parts of different diameters, wherein the part with the larger diameter is on the top, the part with the smaller diameter is on the bottom, and the part with the smaller diameter is provided with an external thread for connecting with the protective sleeve 14. An inwardly extending inner rim 131 is provided in the inner bore of the lifting ring 13, and when the tube 11 is lifted, the outer sleeve assembly is retained by engagement of the inner rim 131. In this embodiment, the inner edge 131 is a closed ring, and the thickness of the inner edge is calculated to break the central tube 11 and the suspension ring 13 when the relative force between the central tube 11 and the suspension ring 13 reaches a predetermined value, so as to separate the central tube 11 from the outer jacket assembly. The purpose is that when the packer is stuck or cannot be unsealed in later construction, the central pipe 11 can be pulled up and pulled off at the lifting ring 13, so that the oil pipe above the telescopic compensator is lifted out, and then the underground falling objects are fished.

In this embodiment, what the protection sleeve 14 specifically adopted is the steel bushing, and the upper and lower both ends of protection sleeve 14 have all set up the internal thread, and through the internal thread that the upper end was set up and the external screw thread cooperation of carrying link 13, fixed connection is in the same place between protection sleeve 14 and the carrying link 13, and in this embodiment, can see from fig. 2 that the external diameter of protection sleeve 14 equals with the external diameter of the great part of diameter of carrying link 13.

The upper end of the lower joint 15 is provided with an external thread which is matched with the internal thread of the lower end of the protective sleeve 14 and is connected with the lower end of the protective sleeve 14 through the external thread. An upward step surface is further arranged on the inner wall of the upper end of the lower joint 15, a sealing gasket 16 is arranged on the step surface, and the sealing gasket 16 is specifically a high-temperature-resistant graphite ring, in this embodiment, six sealing gaskets 16 are arranged, and of course, in other embodiments, the number of the sealing gaskets 16 can be set arbitrarily according to actual needs. The sealing gasket 16 is pressed and fixed on the step surface through a lower retaining ring 17, the lower retaining ring 17 is fixed with the lower connector 15 through an external thread arranged on the outer peripheral surface of the lower retaining ring 17, and in order to facilitate the screwing operation of the lower retaining ring 17, a square groove 171 is arranged on the upper end surface of the lower retaining ring 17 so as to be matched with a corresponding mounting tool. In order to avoid that the rotation of the lower retaining ring 17 directly wears the sealing gasket, in the embodiment, a pressing ring 18 is further arranged between the lower end of the lower retaining ring and the sealing gasket. In addition, in order to facilitate the operation of the lower joint 15, a knurling structure is provided on the outer wall surface of the lower joint 15.

An upper joint 111 is arranged at the upper end of the central tube 11, an upper retaining ring 19 is arranged below the upper joint 111 of the central tube 11, and the upper retaining ring 19 is in threaded connection with the central tube 11. The lower end of the central tube 11 is inserted into the outer sleeve assembly, the upper stop ring 19 is located inside the outer sleeve assembly, and the upper end surface of the central tube forms a stop surface matched with the inner edge of the lifting ring 13.

A support means 12 is supported between the base pipe 11 and the outer jacket assembly for securing an axial relative position between the base pipe 11 and the outer jacket assembly during the lowering of the well, keeping it in a state of being elongated to the longest. When the ambient temperature reaches the set temperature, the supporting device 12 can be softened or melted, thereby releasing the supporting function of the central tube 11 and the outer jacket assembly. In the present embodiment, the support device 12 is a polyethylene tube. The jacket 14 is provided with four outlets 141 through which the common support device 12 flows out after melting, and in this embodiment, the outlets 141 are provided around the circumference of the jacket 14.

The utility model discloses a compensator is adopted to thermal recovery well multilayer branch's theory of operation as follows: in the process of descending along with the pipe column, the polyethylene pipe plays a role in supporting the compensator and preventing the compensator from stretching due to pressure fluctuation, and because the polyethylene pipe cannot resist high temperature, the polyethylene pipe is heated and melted in the steam injection process, and the melted liquid can flow out from the four discharge ports 141 at the lower end of the protective sleeve 14. A plurality of gaskets 16 are axially stacked to seal the lower joint 15 from the center tube 11. During steam injection, the polyethylene pipe is melted into liquid and is discharged in the temperature rising process, the pipe column is heated and stretched, and the lower joint 15, the protective sleeve 14, the pressing ring 18, the lower retaining ring 17 and the lifting and hanging ring 13 move upwards together, so that the compensator is compressed, and the heated stretching distance of the pipe column is compensated. After steam injection is stopped, the temperature drop pipe column retracts, the lower joint 15, the protective sleeve 14, the pressure ring 18, the lower retaining ring 17 and the lifting and hanging ring 13 move downwards together, and the expansion distance of the cooled pipe column is compensated. During later construction, if the packer is blocked or can not be unsealed, the central pipe 11 can be pulled, and the central pipe is pulled off at the position of the lifting hanging ring, so that the oil pipe above the telescopic compensator is lifted out, and then underground falling objects are fished. The compensator can effectively avoid the problem that the packer wriggles to cause the failure of the packer due to the expansion and contraction of the pipe column, and ensures the effect of layered steam injection. The pull-off design reduces the construction difficulty of the packer after being stuck, and improves the working efficiency.

Example 2:

the difference between this embodiment and embodiment 1 is that in this embodiment, the inner edge of the suspension ring is a discontinuous inner edge, and of course, in other embodiments, there may be only one inner edge, and a tooth-like structure is adopted.

Example 3:

the difference between this embodiment and embodiment 1 is that in this embodiment, an upper baffle ring is integrally provided on the outer peripheral surface of the central tube, and in this case, the upper baffle ring will have better strength and reliability. Of course, in other embodiments, the upper retaining ring may also be omitted, in which case it may be possible to cooperate with the support means by providing pins on the wall of the central tube.

Example 4:

this embodiment differs from embodiment 1 in that in this embodiment, the support means is embodied in the form of a cage, rather than the tubular structure described above. In other embodiments, the supporting device may be provided in a rod-type structure or the like as needed.

The above description is only for the preferred embodiment of the present invention, and the present invention is not limited thereto, the protection scope of the present invention is defined by the claims, and all structural changes equivalent to the contents of the description and drawings of the present invention should be included in the protection scope of the present invention.

Claims

1. The multilayer separate production compensator for the thermal production well comprises a central pipe, wherein an upper joint is arranged at the upper end of the central pipe;

an outer jacket assembly including a lower joint at a lower end;

the lower end of the central tube is inserted into an inner cavity of the outer sleeve component and is in anti-falling fit with the outer sleeve component, and a sealing structure is arranged at the fit position of the outer sleeve component and the central tube and is used for being in sealing fit with the central tube when the central tube slides up and down relative to the outer sleeve component; it is characterized in that the preparation method is characterized in that,

2. The thermal production well multi-layer separate production compensator according to claim 1, wherein the supporting device is meltable when the temperature reaches a set value, and the outer jacket assembly is provided with a discharge port through which the supporting device is discharged after being melted.

3. The thermal production well multi-zone production compensator of claim 2, wherein the plurality of discharge ports are distributed around the circumference of the outer jacket assembly.

4. The thermal production well multi-layer separate production compensator according to claim 1, wherein the support device is made of polyethylene.

5. The thermal production well multi-layer production compensator of claim 1 or 4, wherein the support device is a support cylinder, and the support cylinder is sleeved outside the central tube.

6. The thermal production well multilayer separate production compensator according to claim 1, wherein an upper baffle ring is fixedly arranged on the outer wall of the central pipe, and the upper end of the supporting device is matched with the lower end of the upper baffle ring.

7. The thermal production well multi-layer production compensator of claim 6, wherein the upper baffle ring is in threaded engagement with the base pipe.

8. The thermal production well multi-layer separate production compensator according to claim 1, wherein the inner wall of the lower joint is provided with an upward step surface, the sealing structure is a sealing gasket arranged on the step surface, and the sealing gasket is fixed by pressing a lower retaining ring assembled on the lower joint through threads.

9. The thermal production well multi-layer separate production compensator according to claim 8, wherein a compression ring is arranged in front of the lower baffle ring and the sealing gasket.

10. The thermal production well multi-layer separate production compensator according to claim 1, wherein the outer jacket assembly comprises a lifting ring at an upper end, the lifting ring has an inner edge extending inwards, the central tube is stopped by the inner edge to move upwards, when an upward force applied to the central tube reaches a set value, the inner edge can be broken, and the central tube can be pulled out from the lifting ring.