CN116044340A - A metal memory high temperature packer - Google Patents

Abstract

The invention relates to the technical field of oil and natural gas development tools, in particular to a metal memory high-temperature packer, aiming to solve the problem that the expansion packer in the prior art cannot provide sufficient sealing under high temperature conditions. The invention includes a rubber sleeve, a body and a compression mechanism fitted on the body. The compression mechanism includes a compression sleeve fitted on the body, a compression ring located at the lower part of the compression sleeve and a movable sleeve connected to the compression ring; There is a memory alloy rod, and the compression ring abuts against the lower end of the memory alloy rod; the lower end of the movable sleeve abuts against the rubber sleeve. The metal memory high-temperature packer provided by the present invention excites the memory alloy rod after the temperature rises, causing the memory alloy rod to expand and deform, and then push the compression ring to drive the movable sleeve to squeeze the rubber sleeve, so that the rubber sleeve expands and deforms, and completes the seat seal . The memory alloy rod deforms at high temperature, so that the rubber tube can obtain sufficient pressure at high temperature, so as to ensure the expansion of the rubber tube under pressure, and realize the seat seal at high temperature.

Description

A metal memory high temperature packer

technical field

The invention relates to the technical field of oil and natural gas development tools, in particular to a metal memory high temperature packer.

Background technique

In the steam injection production of oil reservoirs, in order to improve the sweep efficiency of long steam injection wells and thereby enhance the recovery factor, the steam should be "uniformly" distributed along the inclined well section, horizontal well section or vertical well section. However, due to the heterogeneity of the reservoir and the cumulative frictional pressure drop along the open hole, the steam generally flows unevenly along the formation, resulting in low sweep efficiency.

Currently, there are many downhole outflow control technologies that can be introduced into steam injection production. For example, outflow control tools can be used to create pressure between the annulus and the interior space of the completion string, thereby affecting the injection pressure (annulus pressure) along the wellbore in an attempt to "balance" the injection profile. This technique typically utilizes open hole packers, such as swell packers, to separate long horizontal wells into multiple injection units. Swellable packers are subjected to activators (such as water, oil, or both) downhole. Conventional swellable packers cannot provide sufficient sealing at high temperatures (above 200°C). During steam injection, steam Large leakage wastes energy, seriously affects the effect of the existing packer, and its use is limited.

Contents of the invention

The object of the present invention is to provide a metal memory high temperature packer to solve the problem that the expansion packer in the prior art cannot provide sufficient sealing under high temperature conditions.

In order to solve the above technical problems, the technical solution provided by the invention is:

A metal memory high-temperature packer includes a rubber sleeve, a body and a compression mechanism fitted on the body. The lower end of the compression mechanism abuts against the upper end of the rubber sleeve.

Further, the compression mechanism includes a compression sleeve fitted on the body, a compression ring located at the lower part of the compression sleeve, and a movable sleeve fixedly connected to the compression ring; the compression sleeve is provided with a storage hole along the axial direction, and a storage hole is arranged in the storage hole The memory alloy rod, the compression ring is in contact with the lower end of the memory alloy rod; the movable sleeve and the compression ring are fixedly connected by connecting screws, and the lower end of the movable sleeve is in contact with the rubber sleeve; the memory alloy rod is heated and expanded to push the compression ring along the The axial direction of the main body slides to drive the movable sleeve to squeeze the rubber tube.

Further, the compression mechanism also includes a locking sleeve, the locking sleeve is fitted on the compression sleeve, and the locking sleeve is fixedly connected with the body.

Further, the compression ring includes an intrusion part and a main body disposed below the intrusion part, the intrusion part is sleeved on the lower part of the compression sleeve, and the upper end of the main body abuts against the lower end of the compression sleeve.

Further, the compression mechanism also includes a shear pin, and the shear pin is inserted into the compression sleeve after radially passing through the protruding portion.

Further, the outer surface of the locking sleeve is provided with first locking teeth, and the inner surface of the movable sleeve is provided with second locking teeth corresponding to the first locking teeth on the outer surface of the locking sleeve; The first locking tooth and the second locking tooth are engaged with each other to prevent the movable sleeve from moving opposite to the direction in which the memory alloy rod pushes the compression sleeve.

Further, the compression mechanism also includes an anti-off sleeve, which is fitted on the upper part of the movable sleeve to prevent the upper part of the movable sleeve from being radially deformed due to radial force when the movable sleeve moves.

Further, the compression mechanism also includes an anti-rotation guide rod, the upper part of the anti-rotation guide rod is inserted into the compression sleeve, and is slidably connected with the compression sleeve; the lower part of the anti-rotation guide rod is fixedly connected with the compression ring.

Further, a plurality of memory alloy rods are evenly distributed in the compression sleeve.

Further, the memory alloy rod is composed of copper-aluminum-nickel shape memory alloy or nickel-titanium alloy.

Further, compression mechanisms are provided at both the upper end and the lower end of the rubber cartridge.

Comprehensive above-mentioned technical scheme, the technical effect that the present invention can realize is:

The metal memory high-temperature packer provided by the present invention includes a rubber sleeve, a body, and a compression mechanism set on the body. The lower end of the compression mechanism abuts against the upper end of the rubber sleeve; the compression mechanism includes a compression sleeve set on the body, a The lower compression ring and the movable sleeve fixedly connected with the compression ring; the compression sleeve is provided with a storage hole along the axial direction, and a memory alloy rod is arranged in the storage hole, and the compression ring abuts against the lower end of the memory alloy rod; the movable sleeve The cylinder and the compression ring are fixedly connected by connecting screws, and the lower end of the movable sleeve abuts against the rubber cylinder; the memory alloy rod pushes the compression ring to slide along the axis of the body after being heated and expands, driving the movable sleeve to squeeze the rubber cylinder.

The metal memory high-temperature packer provided by the present invention activates the memory alloy rod after the temperature rises, causing the memory alloy rod to expand and deform, and then push the compression ring to drive the movable sleeve to squeeze the rubber sleeve, so that the rubber sleeve expands and deforms, and contacts with the well wall Compensate to complete the seat seal. The memory alloy rod deforms at high temperature, so that the rubber tube can obtain sufficient pressure at high temperature, so as to ensure the expansion of the rubber tube under pressure, and realize the seat seal at high temperature.

Description of drawings

In order to more clearly illustrate the specific implementation of the present invention or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings that need to be used in the specific implementation or description of the prior art. Obviously, the accompanying drawings in the following description The drawings show some implementations of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

Fig. 1 is a cross-sectional view of a metal memory high temperature packer provided by an embodiment of the present invention;

FIG. 2 is a cross-sectional view of the upper body 210 in FIG. 1;

FIG. 3 is a cross-sectional view of the compression sleeve 310 in FIG. 1;

Figure 4 is a sectional view of the compression ring 320 in Figure 1;

FIG. 5 is a cross-sectional view of the locking sleeve 360 in FIG. 1 .

Icons: 100-rubber cartridge; 200-body; 300-compression mechanism; 400-anti-return circlip; 210-upper body; 220-middle body; 230-lower body; 310-compression sleeve; 320-compression ring; 330 -Removable sleeve; 340-memory alloy rod; 350-connecting screw; 360-locking sleeve; 370-shear pin; 380-anti-off sleeve; 390-anti-rotation guide rod; 3100-boss ring; 3110-safety screw; 3120-fastening screw; 3130-set screw; 3140-outer ring; 211-second step; 212-third step; 311-storage hole; 312-first step; 313-guide hole; 321 - extended part; 322 - main body part; 323 - stepped hole; 361 - long hole.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

It should be noted that like numerals and letters denote similar items in the following figures, therefore, once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship that is usually placed when the product of the invention is used, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying References to devices or elements must have a particular orientation, be constructed, and operate in a particular orientation and therefore should not be construed as limiting the invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions, and should not be construed as indicating or implying relative importance.

In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are absolutely horizontal or overhanging, but may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal than "vertical", and it does not mean that the structure must be completely horizontal, but can be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation", "installation", "connection" and "connection" should be understood in a broad sense, for example, it may be a fixed connection, It can also be a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

Some embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. In the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

The traditional expandable packer cannot provide sufficient sealing at high temperature (higher than 200°C), and the steam leakage during the steam injection process is large, which wastes energy and seriously affects the effect of the existing packer. limit.

In view of this, the present invention provides a metal memory high temperature packer, which includes a rubber cartridge 100, a body 200 and a compression mechanism 300 fitted on the body 200, the lower end of the compression mechanism 300 abuts against the upper end of the rubber cartridge 100; the compression mechanism 300 includes a compression sleeve 310 set on the body 200, a compression ring 320 located at the lower part of the compression sleeve 310, and a movable sleeve 330 fixedly connected to the compression ring 320; the compression sleeve 310 is provided with a storage hole 311 along the axial direction, and stores A memory alloy rod 340 is arranged in the hole 311, and the compression ring 320 abuts against the lower end of the memory alloy rod 340; the movable sleeve 330 and the compression ring 320 are fixedly connected by connecting screws 350, and the lower end of the movable sleeve 330 abuts against the rubber The barrel 100 ; the memory alloy rod 340 is heated and expanded to push the compression ring 320 to slide along the axis of the body 200 , driving the movable sleeve 330 to squeeze the rubber barrel 100 .

The metal memory high temperature packer provided by the present invention excites the memory alloy rod 340 after the temperature rises, causing the memory alloy rod 340 to expand and deform, and then pushes the compression ring 320 to drive the movable sleeve 330 to squeeze the rubber cylinder 100, so that the rubber cylinder 100 It expands and deforms, and contacts the well wall to complete the setting seal. The memory alloy rod 340 is deformed at high temperature, so that the rubber cartridge 100 can obtain sufficient pressure at high temperature, so as to ensure that the rubber cartridge 100 expands under pressure, and realizes seat sealing at high temperature.

The structure and shape of the metal memory high-temperature packer provided in this embodiment will be described in detail below in conjunction with accompanying drawings 1-5:

In the optional solution of this embodiment, the body 200 includes an upper body 210 and a middle body 220, the upper body 210 and the middle body 220 are coaxially arranged, and the lower part of the upper body 210 is inserted into the upper part of the middle body 220, as shown in Figures 1 and 2 , the lower part of the upper body 210 is provided with external threads, the upper part of the middle body 220 is provided with internal threads, and the upper body 210 and the middle body 220 are screwed together.

Further, the inner side of the middle body 220 is provided with a step, and the step is arranged below the inner thread of the upper part of the middle body 220 , and the lower end of the upper body 210 abuts against the step to limit the insertion depth of the upper body 210 into the middle body 220 .

Further, the rubber cartridge 100 is set on the body 200 and arranged coaxially with the body 200 .

In an optional solution of this embodiment, the compression ring 320 includes an intrusion portion 321 and a main body portion 322 disposed below the intrusion portion 321 , as shown in FIGS. , the upper end of the main body portion 322 abuts against the lower end of the compression sleeve 310 .

Furthermore, the compression sleeve 310 is provided with a first step 312 , and the upper end of the protruding portion 321 abuts against the first step 312 to limit the relative position of the compression ring 320 and the compression sleeve 310 .

In an optional solution of this embodiment, the compression mechanism 300 further includes a shear pin 370, and the shear pin 370 is inserted into the compression sleeve 310 after radially passing through the protruding portion 321, so that the compression sleeve 310 and the compression ring 320 are relatively positioned. fixed, and prevent the compression mechanism 300 from starting early.

In an optional solution of this embodiment, the compression mechanism 300 further includes an anti-rotation guide rod 390, the upper part of the anti-rotation guide rod 390 is inserted into the compression sleeve 310, and is slidably connected with the compression sleeve 310; the lower part of the anti-rotation guide rod 390 is connected to the The compression ring 320 is fixedly attached.

Further, as shown in Figures 1, 3 and 4, the lower part of the compression sleeve 310 is provided with a guide hole 313, and the guide hole 313 is a blind hole; the main body 322 is provided with a step hole 323, and the anti-rotation guide rod 390 passes through the step The hole 323 is inserted into the guide hole 313 behind.

Furthermore, the stepped hole 323 is provided with internal threads, the lower part of the anti-rotation guide rod 390 is provided with external threads, and the lower part of the anti-rotation guide rod 390 is screwed to the stepped hole 323 .

Further, the anti-rotation guide rod 390 is evenly arranged around the axis of the compression sleeve 310 to prevent the compression ring 320 from being unevenly stressed when the memory alloy rod 340 pushes the compression ring 320 , and the compression ring 320 is stuck due to inclination.

Further, the number of anti-rotation guide rods 390 is 6.

In an optional solution of this embodiment, a plurality of memory alloy rods 340 are evenly distributed in the compression sleeve 310 .

Further, six shape memory alloy rods 340 are uniformly distributed in the compression sleeve 310 .

In an optional solution of this embodiment, the compression mechanism 300 further includes an outer ring 3140, the outer ring 3140 is sleeved on the upper body 210, the lower end of the outer ring 3140 abuts against the upper end of the compression sleeve 310 and is fixedly connected with the compression sleeve 310, One end of the storage hole 311 is closed. The lower end surface of the outer ring 3140 is in contact with the memory alloy rod 340 , and after the memory alloy rod 340 is heated and expanded, the alloy rod is elongated in a direction away from the outer ring 3140 , and then squeezes the rubber tube 100 .

Further, the upper body 210 is provided with a second step 211 , and the upper end surface of the outer ring 3140 abuts against the second step 211 to limit the position of the outer ring 3140 on the upper body 210 .

Further, the upper part of the compression sleeve 310 is provided with a threaded hole, and the positioning screw 3130 is inserted into the threaded hole after passing through the outer ring 3140 to fix the outer ring 3140 and the compression sleeve 310 .

Further, the compression mechanism 300 further includes a locking sleeve 360 , the locking sleeve 360 is sleeved on the compression sleeve 310 , the locking sleeve 360 is sleeved on the upper body 210 and fixedly connected to the upper body 210 .

Further, the upper body 210 is provided with a third step 212, as shown in Figures 1 and 2, the upper end surface of the locking sleeve 360 abuts against the third step 212, limiting the position of the locking sleeve 360 on the upper body 210 .

Further, the compression mechanism 300 further includes a fastening screw 3120 , the fastening screw 3120 is inserted into the upper body 210 after passing through the upper part of the locking sleeve 360 , and the locking sleeve 360 is fixedly connected with the upper body 210 .

Further, as shown in FIGS. 1 and 5 , a long hole 361 is opened on the side wall of the locking sleeve 360 , and the length direction of the long hole 361 is the same as the axial direction of the locking sleeve 360 . The connecting screw 350 passes through the movable sleeve 330, and then inserts the compression ring 320 after passing through the long hole 361, and the movable sleeve 330 and the compression ring 320 are connected, so that the compression ring 320 drives the movable sleeve 330 to move; the connecting screw 350 Move in the long hole 361 along the length direction of the long hole 361 .

Further, the outer surface of the locking sleeve 360 is provided with first locking teeth, and the inner surface of the movable sleeve 330 is provided with second locking teeth corresponding to the first locking teeth on the outer surface of the locking sleeve 360 . teeth; the first locking teeth and the second locking teeth are engaged with each other to prevent the movable sleeve 330 from moving in the direction opposite to the direction in which the memory alloy rod 340 pushes the compression sleeve 310 . To avoid shrinkage of the memory alloy rod 340 due to temperature drop, resulting in insufficient extrusion force on the rubber tube 100, the rubber tube 100 pushes the movable sleeve 330 and the compression ring 320 to move upward due to its own elasticity, and the diameter of the rubber tube 100 becomes smaller, so that The case of seat seal failure.

In an optional solution of this embodiment, the compression mechanism 300 also includes an anti-off sleeve 380, and the anti-off sleeve 380 is set on the upper part of the movable sleeve 330 to prevent the upper part of the movable sleeve 330 from moving on the movable sleeve 330. Radial deformation occurs due to radial force.

Further, the compression mechanism 300 further includes a boss ring 3100 , and the boss ring 3100 is sleeved on the upper part of the anti-loosening sleeve 380 . The safety screw 3110 passes through the boss ring 3100 and is inserted into the anti-off sleeve 380, and the boss ring 3100 and the anti-off sleeve 380 are fixedly connected.

Furthermore, the boss ring 3100 is fitted on the upper part of the locking sleeve 360 . The fastening screw 3120 passes through the boss ring 3100 , then passes through the locking sleeve 360 and then inserts into the upper body 210 , so as to fix the boss ring 3100 and the upper body 210 .

Further, the metal memory high temperature packer also includes an anti-retraction clip spring 400 , and the anti-retraction clip spring 400 is arranged on the lower side of the locking sleeve 360 . The lower side of the locking sleeve 360 is set on the upper side of the middle body 220 , and the anti-retraction spring 400 is also clamped in the groove on the upper side of the middle body 220 to prevent the axial displacement between the locking sleeve 360 and the middle body 220 .

Further, the compression ring 320 moves between the lower end surface of the compression sleeve 310 and the upper end surface of the middle body 220 .

Further, the memory alloy rod 340 is made of copper-aluminum-nickel shape memory alloy, and its variable temperature window is 230°C-250°C.

Optionally, for shallow wells with low bottom-hole temperature, the memory metal can also be composed of nickel-titanium Ni-Ti alloy, and the transformation temperature is about 110°C.

In the optional solution of this embodiment, the body 200 also includes a lower body 230, the lower body 230 is coaxially arranged with the upper body 210, and is respectively connected to both sides of the middle body 220, as shown in Figure 1, the structure of the lower body 230 is the same as The upper body 210 is the same, and the lower body 230 is inserted into the lower part of the middle body 220 and screwed to the lower body 230 .

Further, the upper and lower ends of the rubber cartridge 100 are provided with compression mechanisms 300, which increase the compression stroke of the rubber cartridge 100, ensure that the rubber cartridge 100 is fully compressed, and improve the reliability of the seat seal.

The working process of the metal memory high temperature packer provided in this embodiment is as follows:

The upper and lower ends of the metal memory high-temperature packer are respectively connected to the pipe string, and after being lowered to the designated position with the pipe string, the temperature is precisely controlled by injecting steam, so that the memory alloy rod 340 is deformed within the temperature window, and the memory alloy rod 340 is in the storage hole. 311 expands, pushes the compression ring 320 to cut the shear pin 370, and then pushes the compression ring 320 to move, so that the compression ring 320 drives the movable sleeve 330, so that the movable sleeve 330 squeezes the rubber sleeve 100 to expand the rubber sleeve 100, Contact with the well wall to form a seal.

While the compression ring 320 is moving, the anti-rotation guide rod 390 is driven by the compression ring 320 and slides relative to the storage hole 311 to prevent the memory alloy rod 340 from expanding unevenly, causing the compression ring 320 to tilt and cause stagnation.

At the same time, the first locking teeth on the outer surface of the locking sleeve 360 and the second locking teeth on the inner surface of the movable sleeve 330 are engaged with each other to prevent the memory alloy rod 340 from deforming and recovering after the temperature drops. The movable sleeve 330 and the compression ring 320 are pushed back, resulting in a loose seal between the rubber sleeve 100 and the well wall, ensuring the sealing effect of the packer.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (10)

1. The metal memory high-temperature packer comprises a rubber cylinder (100) and is characterized by further comprising a body (200) and a compression mechanism (300) sleeved on the body (200), wherein the lower end of the compression mechanism (300) is abutted to the upper end of the rubber cylinder (100);

the compression mechanism (300) comprises a compression sleeve (310) sleeved on the body (200), a compression ring (320) positioned at the lower part of the compression sleeve (310) and a movable sleeve (330) fixedly connected with the compression ring (320);

the compression sleeve (310) is provided with a storage hole (311) along the axis direction, a memory alloy rod (340) is arranged in the storage hole (311), and the compression ring (320) is abutted with the lower end of the memory alloy rod (340);

the movable sleeve (330) is fixedly connected with the compression ring (320) through a connecting screw (350), and the lower end of the movable sleeve (330) is abutted against the rubber cylinder (100);

the memory alloy rod (340) is heated and expanded to push the compression ring (320) to slide along the axial direction of the body (200), so as to drive the movable sleeve (330) to squeeze the rubber cylinder (100).

2. The metal memory high temperature packer of claim 1, wherein the compression mechanism (300) further comprises a locking sleeve (360), the locking sleeve (360) is sleeved on the compression sleeve (310), and the locking sleeve (360) is fixedly connected with the body (200).

3. The metal memory high temperature packer of claim 2, wherein the compression ring (320) comprises an extending portion (321) and a main body portion (322) disposed below the extending portion (321), the extending portion (321) is sleeved on the lower portion of the compression sleeve (310), and an upper end of the main body portion (322) is abutted to the lower end of the compression sleeve (310).

4. A metal-memory high temperature packer according to claim 3, wherein the compression mechanism (300) further comprises a shear pin (370), said shear pin (370) being inserted into the compression sleeve (310) after passing radially through the penetration (321).

5. The metal-memory high temperature packer of claim 4, wherein an outer surface of the locking sleeve (360) is provided with first locking teeth, and an inner surface of the movable sleeve (330) is provided with second locking teeth corresponding to the first locking teeth of the outer surface of the locking sleeve (360);

the first locking tooth and the second locking tooth intermesh to prevent movement of the movable sleeve (330) in a direction opposite to that in which the memory alloy rod (340) pushes the compression sleeve (310).

6. The metal-memory high temperature packer of claim 5, wherein the compression mechanism (300) further comprises an anti-slip sleeve (380), the anti-slip sleeve (380) being sleeved on an upper portion of the movable sleeve (330) to prevent the upper portion of the movable sleeve (330) from being radially deformed by a radial force when the movable sleeve (330) moves.

7. The metal-memory high temperature packer of claim 6, wherein the compression mechanism (300) further comprises an anti-rotation guide rod (390), an upper portion of the anti-rotation guide rod (390) being inserted into the compression sleeve (310) and slidingly connected with the compression sleeve (310);

the lower part of the anti-rotation guide rod (390) is fixedly connected with the compression ring (320).

8. The metal memory high temperature packer of claim 7, wherein a plurality of memory alloy rods (340) are annularly and uniformly distributed in the compression sleeve (310).

9. The metal memory high temperature packer of claim 8, wherein the memory alloy stick (340) is comprised of a copper-aluminum-nickel shape memory alloy or of a nickel titanium alloy.

10. The metal memory high temperature packer of claim 9, wherein the upper end and the lower end of the packing element (100) are both provided with the compression mechanism (300).

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