CN110043200B - Magnetic signal activated variable-diameter centralizer - Google Patents

Abstract

The invention discloses a magnetic signal activated diameter-variable centralizer, which comprises a single-bow elastic centralizer, a steel belt buckle, a steel belt, an activation lock assembly and a permanent magnet hollow rubber plug. The steel belt buckle is fixed in the middle of the righting strip of the single-arch elastic righting device, the steel belt is located in the middle of the steel belt buckle, and the magnetically activated lock assembly is fixed on the head of the steel belt. When the device is used, the centralizing strip is bound by the steel belt before going down to the well, after the casing pipe goes down to a specified position, the permanent magnet hollow rubber plug is put down through the inside of the casing pipe, the magnetic signal of the permanent magnet hollow rubber plug is tested by the magnetic field test circuit board, the electromagnet is driven to suck out the pin, the piston moves down under the action of external fluid pressure, the steel belt is released, and the centralizing strip is in a bouncing state. The invention is used for ensuring the centering degree of the casing and shortening the casing running time, and has the advantages of simple design, lower processing cost and convenient assembly.

Description

A variable diameter centralizer activated by a magnetic signal

technical field

The invention belongs to the technical field of oil and gas well engineering, and in particular relates to a variable diameter centralizer activated by a magnetic signal.

Background technique

It is well known that during the cementing process, the casing centering degree in the wellbore is an important factor affecting the displacement efficiency. Poor centering is easy to form broad and narrow sides. When replacing drilling fluid, the cement slurry is easy to return along the wide side, resulting in unclean or even unreplaceable drilling fluid for narrow sides, which seriously affects the cementing quality.

In the prior art, the most effective way to improve the centering degree is to use a centralizer. However, the outer diameter of the rigid centralizer itself is very small, and the irregular well section, the big belly well section and the Tanghulu well section cannot play the role of centralizing, and the large deformation of the centralizing strip in the elastic centralizer is likely to increase the friction resistance of casing downhole.

Therefore, there is an urgent need for a variable diameter centralizer, which binds the centralizer before entering the well, so as to solve the problem of large friction when the casing goes down the well. Tube down time.

SUMMARY OF THE INVENTION

In order to overcome a series of defects existing in the prior art, the purpose of the present invention is to provide a variable diameter centralizer activated by a magnetic signal: the centralizer can be bound before entering the well, and the centralizer can be placed at a designated position after going down the well. Pop open to ensure casing centering and shorten casing running time.

The technical scheme of the present invention is as follows:

A variable diameter centralizer activated by a magnetic signal, comprising a single bow-shaped elastic centralizer 1, a steel belt buckle 2, a steel belt 3, an activation lock assembly 4 and a permanent magnet hollow rubber plug 5, the steel belt buckle 2 is fixed on the The single arcuate elastic centralizer 1 is located in the middle of the centralizer, the steel belt 3 is located in the middle of the steel belt buckle 2 , and the magnetic activation lock assembly 4 is fixed on the head of the steel belt 3 .

Further, the magnetically activated lock assembly 4 includes an electromagnet 401, a spring 402, a cylinder 403, an upper cover 404, a piston 405, a piston seal 406, a pin 407, a pin seal 408, a magnetic field test circuit board 410, and a magnetic field test Circuit board support cover 411 , magnetic field test circuit board support 412 , second screw 413 , high temperature battery support cover 415 , high temperature battery support 416 , high temperature battery 4179 and sealing ring 420 .

Further, the pins 407 enter the inside of the cylinder through the pin holes of the cylinder 403 , the pins 407 and the pin holes of the cylinder 403 are in clearance fit, and a pin sealing ring 408 is used between the pins 407 and the pin holes of the cylinder 403 . Sealing, the electromagnet 401 is fixed outside the cylinder 403 by the second screw 413, just facing the pin hole of the cylinder 403, the outside of the electromagnet 401 is fixed by the spring 402 to the pin 407 in the pin hole of the cylinder 403.

Further, the piston 405 is located in the middle of the cylinder 403, the positioning of the piston 405 depends on the extension of the pin 407 inside the pin hole of the cylinder 403, the outer surface of the piston 405 and the piston hole of the cylinder 403 are clearance fit, There is clearance fit between the outer surface of the piston 405 and the inner surface of the middle hole of the upper cover 404 , and the gap between the piston 405 and the piston hole of the cylinder 403 is sealed by the piston sealing ring 406 .

Further, the magnetic field testing circuit board 410 is mounted on the magnetic field testing circuit board support 412 , and is sealed with the magnetic field testing circuit board support cover 411 and the sealing ring 420 .

Further, the high temperature battery 417 is installed on the high temperature battery support 416 and sealed with the high temperature battery support cover 415 and the sealing ring 420 ;

Further, the activation method of the magnetic activation lock assembly 4 is as follows: the permanent magnet hollow rubber plug 5 is lowered into the casing, the magnetic field test circuit board 410 tests the magnetic signal of the permanent magnet, the driving electromagnet 401 sucks out the pin 407, and the external fluid pressure Under the action of , the piston 407 moves down, the steel belt 3 is released, and the centralizing strip of the single-bow elastic centralizer 1 is in a state of popping open.

The variable diameter centralizer activated by the magnetic signal of the present invention has the following beneficial effects:

It is used to ensure the centering of the casing and shorten the time of running the casing;

The tool design is simple, the processing cost is low, and the assembly is convenient.

Description of drawings

1 is a schematic diagram of the overall structure of a variable diameter centralizer activated by a magnetic signal of the present invention;

2 is a schematic structural diagram of a magnetically activated lock assembly of a variable diameter centralizer activated by a magnetic signal of the present invention;

3 is a schematic diagram of a permanent magnet hollow rubber plug of a variable diameter centralizer activated by a magnetic signal of the present invention;

Among them, the reference numerals in the figure are:

1-Single bow elastic centralizer, 2-Steel buckle, 3-Steel belt, 4-Magnetic activation lock assembly, 5-Permanent magnet hollow rubber plug;

401-electromagnet, 402-spring, 403-cylinder, 404-cover, 405-piston, 406-piston seal, 407-pin, 408-pin seal, 409-first screw, 410-magnetic field test circuit Board, 411- Magnetic Field Test Circuit Board Holder Cover, 412- Magnetic Field Test Circuit Board Holder, 413-Second Screw, 414-Third Screw, 415-High Temperature Battery Holder Cover, 416-High Temperature Battery Holder, 417-High Temperature Battery, 418 - Fourth screw, 419 - Fifth screw, 420 - sealing ring;

501-hollow rubber plug ring, 502-ring permanent magnet.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the embodiments of the present invention.

Throughout the drawings, the same or similar reference numbers refer to the same or similar elements or elements having the same or similar functions. The described embodiments are some, but not all, of the embodiments of the present invention. The embodiments and directional words described below with reference to the accompanying drawings are all exemplary, and are intended to be used to explain the present invention, but should not be construed as limiting the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

The present invention is a tool for ensuring the centering degree of the casing, which includes an external purchased device (single arcuate elastic centralizer, screws, etc.) and a pin, a cylinder, a pin sealing ring, Pistons, piston seals and caps, etc.

On the basis of the prior art single bow-shaped elastic centralizer, it is realized by a steel belt buckle, a steel belt, a magnetically activated lock assembly and a permanent magnet hollow rubber plug. in,

The steel belt buckle is welded to the middle position of the centralizer of the single bow-shaped elastic centralizer, the steel belt is located in the middle position of the steel belt buckle, and the magnetic activation lock assembly is fixed to the head of the steel belt by screws;

Magnetic activation lock assembly includes cylinder block, cylinder cover, piston, piston seal, pin, pin seal, spring, magnetic field test circuit board, magnetic field test circuit board holder, magnetic field test circuit board holder seal cover, electromagnet, high temperature battery , High temperature battery bracket, high temperature battery bracket sealing cover, screws.

Among them, the pin enters the cylinder body through the pin hole of the cylinder block, the pin and the pin hole of the cylinder block are clearance fit, the pin and the pin hole are sealed with a pin sealing ring, and the electromagnet is fixed to the outside of the cylinder block by screws. The electromagnet is facing the pin hole of the cylinder block, and the outside of the electromagnet fixes the pin in the pin hole of the cylinder block through a spring; the piston is in the middle of the cylinder block, and the positioning of the piston depends on the extension of the pin inside the pin seat. There is a clearance fit between the piston holes of the cylinder, and a clearance fit between the outer surface of the piston and the inner surface of the middle hole of the upper cover. The gap between the piston and the piston hole of the cylinder is sealed by the piston sealing ring; the magnetic field test circuit board is installed in the magnetic field test circuit The high temperature battery is installed on the high temperature battery support and sealed with the sealing cover; the magnetic field test circuit board support and the high temperature battery support are integrated on the cylinder block.

The permanent magnet hollow rubber plug includes an annular permanent magnet and a hollow rubber plug ring. The present invention will be further described in detail below in conjunction with the accompanying drawings.

Referring to FIG. 1 , a magnetic signal variable diameter centralizer includes a single arcuate elastic centralizer 1 , a steel belt buckle 2 , a steel belt 3 , a magnetically activated lock assembly 4 and a permanent magnet hollow rubber plug 5 . The steel belt buckle 2 is welded to the central position of the centralizing strip of the single bow-shaped elastic centralizer 1, the steel belt 3 is located in the middle position of the steel belt buckle 2, and the magnetic activation lock assembly 4 is fixed to the head of the steel belt 3 by screws.

Referring to FIG. 2, the magnetically activated lock assembly 4 includes an electromagnet 401, a spring 402, a cylinder 403, an upper cover 404, a piston 405, a piston seal 406, a pin 407, a pin seal 408, a first screw 409, and a magnetic field test circuit board 410, magnetic field test circuit board support cover 411, magnetic field test circuit board support 412, second screw 413, third screw 414, high temperature battery support cover 415, high temperature battery support 416, high temperature battery 417, fourth screw 418, fifth screw 419, sealing ring 420. in,

The pin 407 enters the inside of the cylinder through the pin hole of the cylinder 403, the pin 407 and the pin hole of the cylinder 403 are in clearance fit, the pin 407 and the pin hole of the cylinder 403 are sealed with a pin sealing ring 408, and the electromagnet 401 The second screw 413 is fixed to the outside of the cylinder 403, just facing the pin hole of the cylinder 403, the outside of the electromagnet 401 fixes the pin 407 in the pin hole of the cylinder 403 through the spring 402; the piston 405 is in the middle of the cylinder 403 , the positioning of the piston 405 depends on the extension of the pin 407 inside the pin hole of the cylinder 403, the outer surface of the piston 405 and the piston hole of the cylinder 403 are clearance fit, the outer surface of the piston 405 and the inner surface of the middle hole of the upper cover 404 are in clearance fit The gap between the piston 405 and the piston hole of the cylinder 403 is sealed by the piston sealing ring 406; the magnetic field testing circuit board 410 is installed on the magnetic field testing circuit board bracket 412, and the magnetic field testing circuit board bracket cover 411 and the sealing ring are used. 420 for sealing; the high temperature battery 417 is installed on the high temperature battery bracket 416 and sealed with the high temperature battery bracket cover 415 and the sealing ring 420; the magnetic field test circuit board bracket 412 and the high temperature battery bracket 416 are integrated on the cylinder block 403.

Further optimization or/and improvement of the above-mentioned technical solutions of the invention:

The variable diameter centralizer described above has a maximum outer diameter of 165mm after restraint, a maximum outer diameter of 210mm after activation, and a length of 515mm, but it should be appreciated that the present invention is not limited to this size.

The above-mentioned variable diameter centralizer is hollow inside, and the diameter of the inner hole is 146.7 mm, but it should be appreciated that the present invention is not limited to this size.

The above-mentioned activation lock assembly is a sealing assembly.

The use process of the preferred embodiment of the present invention:

The centralizer of the variable diameter centralizer is bound by the steel belt 3 before going down the well. When the casing goes down to the designated position, the permanent magnet hollow rubber plug 5 is lowered into the casing, and the permanent magnet hollow rubber plug 5 is tested by the magnetic field test circuit board 410. The magnetic signal drives the electromagnet 401 to suck out the pin 407. Under the action of the external fluid pressure, the piston 407 moves down, the steel belt 3 is released, and the centering bar is in a state of popping open.

Since the pin 407 and the pin hole of the cylinder block 40 are in clearance fit, in order to prevent the pin 407 from leaving the pin hole of the cylinder block 403 under the action of external force, a spring 402 is used to fix the electromagnet 401 and the pin 407. When the electromagnet 401 is activated When the electromagnet 401 attracts the pin 407, the spring 402 is compressed.

By using the variable diameter centralizer of the present invention, the casing centering degree can be ensured and the casing running time can be shortened.

Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit 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 to some of the technical features; and these Modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (6)

1. A variable diameter centralizer activated by a magnetic signal, comprising a single arcuate elastic centralizer (1), a steel belt buckle (2), a steel belt (3), a magnetically activated lock assembly (4) and a permanent magnet hollow rubber plug (5), the steel belt buckle (2) is fixed at the central position of the centralizing strip of the single arcuate elastic centralizer (1), and the steel belt (3) is located at the middle position of the steel belt buckle (2), The magnetic activation lock assembly (4) is fixed on the head of the steel belt (3), characterized in that, The magnetic activation lock assembly (4) includes an electromagnet (401), a spring (402), a cylinder (403), an upper cover (404), a piston (405), a pin (407), and a magnetic field test circuit board (410) , The pin (407) enters the cylinder through the pin hole of the cylinder (403), The electromagnet (401) is fixed on the outside of the cylinder body (403), just facing the pin hole of the cylinder body (403), and the outside of the electromagnet (401) fixes the pin (407) on the cylinder body (403) through a spring (402). ) in the pin hole, The piston (405) is located in the middle of the cylinder (403), and the positioning of the piston (405) depends on the extension of the pin (407) inside the pin hole of the cylinder (403), The activation method of the magnetic activation lock assembly (4) is as follows: the permanent magnet hollow rubber plug (5) is inserted into the casing, the magnetic field test circuit board (410) tests the magnetic signal of the permanent magnet, and the electromagnet (401) is driven to suck out the pin ( 407), under the action of the external fluid pressure, the piston (405) moves down, the steel belt (3) is released, and the centralizing strip of the single-bow elastic centralizer (1) is in a state of springing open. 2. The variable diameter centralizer according to claim 1, wherein the magnetically activated lock assembly (4) further comprises a piston sealing ring (406) and a pin sealing ring (408). 3. The variable diameter centralizer according to claim 2, wherein the pin (407) and the pin hole of the cylinder (403) are in clearance fit, and the pin (407) and the pin of the cylinder (403) are in clearance fit. A pin seal (408) is used to seal between the holes. 4. The variable diameter centralizer according to claim 2, characterized in that the outer surface of the piston (405) and the piston hole of the cylinder (403) are clearance fit, and the outer surface of the piston (405) is in contact with the upper cover (405). 404) The inner surface of the middle hole is a clearance fit, and the gap between the piston (405) and the piston hole of the cylinder block (403) is sealed by the piston sealing ring (406). 5. The variable diameter centralizer according to claim 1, wherein the magnetically activated lock assembly (4) further comprises a magnetic field testing circuit board bracket (412), a magnetic field testing circuit board bracket cover (411) and a seal The magnetic field testing circuit board (410) is mounted on the magnetic field testing circuit board bracket (412) and sealed with the magnetic field testing circuit board bracket cover (411) and the sealing ring (420). 6. The variable diameter centralizer according to claim 5, wherein the magnetically activated lock assembly (4) further comprises a high temperature battery (417), a high temperature battery support (416) and a high temperature battery support cover (415) , the high temperature battery (417) is mounted on the high temperature battery support (416), and is sealed with the high temperature battery support cover (415) and the sealing ring (420); the magnetic field test circuit board support (412), the high temperature battery support (416) ) is integrated on the cylinder block (403).

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