CN107882515A - A kind of sleeve pipe suspending apparatus - Google Patents

Abstract

The invention provides a casing suspension device, comprising: a pipe body, an upper expansion arm, a lower expansion arm and a suspension arm; a tension spring is used for shrinking, expanding and supporting the suspension arm; the upper and lower side walls of the pipe body are provided with The bolt hole is used to install the fixing bolt; the soluble pin locks the sliding support ring and sets the tension spring in a stretched state; the soluble pin is in the underground, and when it meets cement, it is melted and the tension spring is released; the tension spring shrinks and slides The support ring slides toward the middle; the extension arm and the suspension arm shrink and move toward the middle; the outward support is opened, and the casing is supported, righted, centered, and suspended. The invention is lowered with casing or stern pipe in one trip, placed outside the casing, the outer diameter is small, and the outer diameter expands after opening; no hydraulic opening, no casing drilling, no pollution, no limit on the number of running, and no Influenced by casing wall thickness, threads, and materials; improving casing centering, stabilizing centralizing force, and improving cementing quality; prolonging the life of production wells, suitable for highly deviated and horizontal wells.

Description

A casing suspension device

technical field

The utility model relates to the technical field of running casing pipes, running tail pipes, cementing operations and cementing downhole tools in oil and gas wells, in particular to a cement cementing device.

Background technique

Well cementing is an indispensable and important link in the process of drilling and completion operations, which includes casing running, tailpipe and cementing. Cementing technology has the characteristics of systematic, one-time and short time. The main purpose of cementing is to protect and support the casing and tailpipe in oil and gas wells, and to isolate oil, gas and water formations.

The top cementing is the surface casing cementing. During the drilling process, the technical casing cementing is often required. The deepest bottom of the well often needs to be cemented with the liner (including the liner hanger, etc.). Like tunnels and roadways in coal mines, well collapse, high pressure and unstable formations will also be encountered during drilling. Before the oil layer is drilled through, the oil, gas and water are in a state of balance and isolation in the formation, and the oil, gas and water layers are connected as a whole after drilling. Therefore, in order to exploit oil and gas, it is necessary to inject cement into the casing of the oil layer to tightly seal the oil, gas and water layers; at the same time, the casing of the oil layer is the channel for transporting the oil and gas reservoirs to the wellhead during production.

The casing centralizer is a key device to improve the quality of cement cementing after the casing is run into the well. Its function is to suspend, support, straighten and center the casing in the annular space of the open hole wall, and rely on cement cementing to isolate oil, gas and water. layer, making the casing a channel for oil and gas to enter the well.

Therefore, the supporting casing centralizer equipment related to cementing operations can be widely used.

At present, there are mainly two types of casing centralizers related to cementing operations at home and abroad:

The first is the cementing elastic centralizer. The casing is straightened by the spring sheet, but the cementing elastic centralizer cannot ensure the casing is straightened, centered, and suspended: especially in highly deviated wells and horizontal wells, it is affected by the gravity of the casing; the casing is not centered; the cementing quality bad.

The second cementing rigid centralizer. Although the cementing rigid centralizer ensures the centering of the casing part of the wellbore, it is still a difficult problem in the industry to achieve complete centering, especially in the horizontal well section, reaming well section, and belly well section. It brings difficulties to the cement cementing operation, the sealing quality after cement cementing, the interlayer isolation, the isolation of oil, gas and water, and is not conducive to the long-term effective production of cased wells.

Chinese patent CN 201210359506.2 (patent name: hydraulic casing centralizer; application date: 2014.04.23;) discloses a hydraulic opening type casing centralizer.

It includes: a hydraulic casing centralizer; used for straightening casing strings; it is characterized in that the hydraulic casing centralizer includes a center pipe, a centralizing joint, a first ball, a pin shaft, a first fixed cover, a hydraulic cylinder, Fixing screw, second ball, second fixed cover, piston, hydraulic channel, valve, screw plug, centralizing arm, inclined plate and extension spring; one end of the central tube is connected to the centralizing joint; the centralizing joint is opposite to the One end of the center pipe protrudes; a part of the first ball is embedded in the outer wall of the centralizing joint, and the first ball is fixed on the outer wall of the centralizing joint through the first fixing cover, and the first ball The other part of the center tube protrudes from the first fixed cover; the first ball is used to straighten the casing string, and the other end of the center tube is connected to the hydraulic cylinder, and the central tube is opposite to the hydraulic cylinder stretch out, the liquid cylinder is connected with the central tube through the fixing screw, a part of the second ball is embedded on the outer wall of the liquid cylinder, and the second ball is fixed on the second ball through the second fixing cover. The outer wall of the liquid cylinder, the other part of the second ball protrudes from the second fixed cover, the second ball is used to straighten the casing string, and a There is the piston, and the piston can move axially relative to the hydraulic cylinder, and a hydraulic passage is provided in the hydraulic cylinder, through which the piston and the central pipe are connected, and the plug passes through the the central pipe and block the hydraulic channel, the centralizing arm and the inclined plate are arranged in sequence between the centralizing joint and the hydraulic cylinder, and one end of the centralizing arm and the centralizing joint pass through a pin connected, the other end of the righting arm engages with the slope of the slant plate, the righting arm is used to right the casing string, the right-angled side of the slant plate is against the piston, the slant The plate is used to prop up the centralizing arm, and the tension spring is provided on the centralizing arm; during the lowering process of the casing string and the cementing process, the centralizing arm does not work, and the first ball and the The second ball straightens the casing string. During cementing, the plug is knocked down, the hydraulic channel communicates with the casing string, and the casing string suppresses pressure. The piston pushes the swash plate to move, forcing the righting arm to open, thereby righting the casing string.

Chinese patent CN 201420718130.4 (patent name: dual-cylinder casing hydraulic centralizer); application date: 2014.11.26) discloses: double-hydraulic casing casing hydraulic centralizer.

It includes: a double-hydraulic casing casing hydraulic centralizer, which is characterized in that it includes a central pipe, a centralizing spring support, a left hydraulic device and a right hydraulic device; A left hydraulic device that can push the left end of the righting spring support to the right is fixedly installed on the central tube on the left side of the righting spring support; Right hydraulic unit.

The utility model relates to the technical field of hydraulic centralizers, which is a double-hydraulic cylinder casing hydraulic centralizer; it includes a central pipe, a centralizing spring support, a left hydraulic device and a right hydraulic device; The central tube on the left side of the centralizing spring support is fixedly installed with a left hydraulic device capable of pushing the left end of the centralizing spring support to the right; Support the right hydraulic device that the right end limit pushes to the left. The utility model has a reasonable and compact structure and is easy to use; the double-cylinder structure of the left hydraulic device and the right hydraulic device can effectively reduce the pressure of wellhead injection and reduce the pressure on the ground under the premise that the righting spring support can be compressed and supported. The equipment needs to be used under pressure, and the cost is low; it is more suitable for use in horizontal wells with large well depths, and has higher reliability.

Chinese patent CN 201320600984.8 (patent name: casing centralizer; application date: 2013.09.27) discloses a casing centralizer.

Including: mainly composed of central pipe, hydraulic cylinder, connecting sleeve, driving chain plate, driven chain plate, upper bracket, lower bracket, pins, sealing ring, backstop ring, backstop ring cap. The center pipe is provided with a liquid inlet hole. The hydraulic cylinder and the anti-retraction ring seat are connected through a connecting sleeve, and the anti-retraction ring seat and the center pipe are connected through a pin. The driving chain plate and the driven chain plate are connected by pins to form a hinge. The upper support and the lower support are respectively connected with the upper and lower ends of the hinge. The hinged casing centralizer can ensure that the hinged casing centralizer is safely lowered to the designed position of the oil well, and can effectively improve the centering degree of the casing and improve the cementing quality. The casing centralizer is characterized in that it includes: a central tube, a hydraulic cylinder sleeve sleeved outside the central tube and forming an axial sliding seal fit with the central tube, an upper support sleeved outside the central tube and linked with the hydraulic cylinder sleeve, and a set The lower bracket fixed at the lower part of the central tube, the active chain plate and the driven chain plate hinged between the upper and lower brackets are respectively hinged with the corresponding upper and lower brackets, the active chain plate and the driven chain plate are more than two groups and Evenly distributed between the upper and lower brackets outside the central tube, hydraulic through-holes are arranged radially on the central tube, and the through-holes are arranged at the corresponding parts of the inner annular cavity of the hydraulic cylinder liner.

Chinese patent CN 201210359506.2 cannot guarantee the integrity and tightness of casing strings; after long-term oil and gas production, there are corrosion perforations, failure of hydraulic cylinder and piston seals, pressure leakage, and leakage. Chinese patent CN 201420718130.4 cannot guarantee the integrity of the casing string; tightness; after long-term oil and gas production, there will be corrosion and perforation, more cylinder and piston seal failures, pressure leakage, leakage, and internal and external collusion. Chinese patent CN 201320600984.8 cannot guarantee the integrity of casing strings; tightness; after long-term oil and gas production, there are corrosion perforations, seal failures between hydraulic cylinders and pistons, pressure leakage, leakage, and internal and external oil, gas and water collusion. There will be difficult situations of oil and gas production leakage, channeling, and interlayer interference.

Utility model content

The purpose of this utility model is to provide a novel casing suspension device (casing centralizer), which has no hydraulic piston, hydraulic cylinder, and seal; does not require ground pressurization; does not require downhole hydraulic opening; and can ensure that the casing Integral tightness of the string or tailpipe string.

The utility model provides a casing suspension device, comprising: a pipe body, an extension arm (including an upper extension arm and a lower extension arm) and a suspension arm for suspension and righting;

The upper end of the pipe body has a step; the upper side wall of the pipe body is provided with threaded holes, and the fixing bolts pass through the threaded holes to fix the pipe body and the casing; the lower end is equipped with a lower joint, and the side wall is also provided with threaded holes, and the fixing bolts pass through the threaded holes Fix the tube body and the sleeve; the inner diameter of the tube body is larger than the outer diameter of the sleeve, and it is inserted into the body part of the sleeve from the male end of the sleeve.

The expansion arm and the suspension arm include: an upper expansion arm and a lower expansion arm; they can move up and down along the pipe body; under the guidance of the force of the tension spring, they shrink toward the center of the pipe body; they support the suspension arm to expand outward and support , suspending, righting and centering casing strings;

The upper end and the lower end of the pipe body are respectively provided with a first limiting portion and a second limiting portion for limiting the positions of the extension arm and the suspension arm.

The utility model is in the process of lowering with the casing string and before cementing; the expansion arm and the suspension arm do not expand outwards, and after being lowered into the oil well or natural gas well, the soluble pin is broken by melting during the cementing process; so that the The tension spring shrinks; under the guidance of the force of the tension spring, the extension arm and the suspension arm shrink toward the center of the pipe body; the suspension arm is supported to expand outward, support the casing string, and force the casing to be suspended, righted, and centered string.

The expansion arm and the suspension arm are contracted and stuck in the first limit part, so that the outer diameter of the casing suspension device is the smallest, ensuring that the utility model has good passability when the utility model is initially lowered into an oil well or a natural gas well; it does not affect the running of the casing string . After running into the oil well or natural gas well, there is no need to use professional opening, and there is no need for ground pressure hydraulic opening; during the cementing process, the soluble pin is broken by melting; In this state, forcefully suspend, straighten and center the casing string.

Further, the soluble pin is made of soluble metal.

The soluble pins of the casing suspension device are dissolved in the cement during the cementing process, which can ensure the suspension, righting and centering of the casing to the greatest extent, especially in highly deviated well sections and horizontal well sections; The cement cementing is clean and unobstructed.

Further, the casing suspending device includes a plurality of expansion arms and suspension arms uniformly arranged along the circumferential direction of the pipe body, and the plurality of expansion arms and suspension arms form an umbrella-shaped or cylindrical structure.

Further, the first limiting part is a concave tapered surface provided along the inner wall of the lower joint, and the outer diameter of the upper part of the first limiting part is equal to the outer diameter of the lower part of the first limiting part.

Further, the upper end of the tension spring is provided with a groove matching the concave tapered surface of the upper end of the pipe body.

Further, the outer side of the tension spring is covered and protected by an umbrella-shaped and cylindrical structure composed of a plurality of extended arms and suspended arms.

Multiple extension arms and cantilever arms form an umbrella-shaped and cylindrical structure, so that the tension spring is better protected and effectively prevented from being worn out during the process from entering the well to the bottom of the well.

Further, the tension spring is a strong tension spring.

Further, the fixing bolts are all made of close-threaded screws (or without nuts).

Compared with the existing technology, the casing suspension device provided by the utility model has the following advantages:

1. Run in one trip with the casing or liner;

2. There is no need for additional surface mud pumps and cementing pumps, which saves costs;

3. There is no need for ground pressure, no pressure inside the casing, no downhole hydraulic pressure to open the casing suspension device, and no pollution to the formation;

4. No seals; suitable for application in high temperature and high pressure wells;

5. Before the cement cementing begins, the casing suspension device remains in a contracted state with the smallest outer diameter; it is convenient for casing running;

6. After the cement cementing starts, the soluble pins will melt and break when they meet the cement; the casing suspension device keeps expanding, and the outer diameter is the largest; the casing string is suspended, righted, and centered;

7. Run into the vertical well section, highly deviated well section, and horizontal well section; there are no restrictions;

8. There is no limit to the number and depth of running.

Description of drawings

In order to more clearly illustrate the specific implementation of the utility model or the technical solutions in the prior art, the accompanying drawings that need to be used in the description of the specific implementation or the prior art will be briefly introduced below. Obviously, the following descriptions The accompanying drawings are some implementations of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without any creative work.

Fig. 1 is the structural representation before the fixing bolt of the utility model is not fixed;

Fig. 2 is the structural representation of the utility model when the fixing bolt is fixed;

Fig. 3 is the schematic diagram of the structure after the soluble pin is melted and broken in the utility model;

Fig. 4 is a schematic diagram of the structure of the utility model inserted into the casing or the tail pipe, and the fixing bolt is not fixed in front of the casing or the tail pipe;

Fig. 5 is a schematic diagram of the structure after the utility model is inserted into the casing or the tailpipe, and the fixing bolt is fixed on the casing or the tailpipe;

Fig. 6 is a schematic diagram of the structure when the casing or tailpipe is supported, suspended, righted, and centered after the soluble pin is melted and broken in the utility model;

Fig. 7 is the structural representation of fixing bolt in the utility model;

Fig. 8 is the structural representation of the dissolvable pin in the utility model

Fig. 9 is a schematic diagram of the structure of the soluble pin in the utility model after being melted off

Reference signs:

1-tube body; 2-fixing bolts;

3-bolt hole; 4-upper extension arm;

5-fixed pin; 6-cantilever arm;

7-extension spring; 8-lower extension arm;

9-sliding support ring; 10-dissolvable pin;

11-lower joint; 12-first limiting part;

13 - the second limiting part.

Detailed ways

The technical solutions of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are part of the embodiments of the utility model, but not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" The orientation or positional relationship indicated by etc. is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, use a specific The azimuth structure and operation, therefore can not be construed as the limitation of the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a flexible connection. Detachable connection, or integral connection; it can be mechanical connection or electrical connection; it can be direct connection or 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 utility model in specific situations.

Fig. 1 is the schematic diagram of the structure before the fixing bolt of the utility model is not fixed; Fig. 2 is the schematic diagram of the structure after the fixing bolt of the utility model is fixed; Fig. 3 is the schematic diagram of the structure after the soluble pin is melted in the utility model; Fig. 4 After the utility model is inserted into the sleeve or tail pipe, the fixed bolt is not fixed in front of the sleeve or tail pipe. , Righting, and centering when getting up; Figure 7 is a schematic structural view of the fixing bolt in the utility model; Figure 8 is a schematic structural view of the soluble pin in the utility model; Figure 9 is a soluble pin in the utility model after being melted Schematic diagram of the structure

As shown in Figure 1, a casing suspension device provided by the utility model includes: a pipe body 1, an upper extension arm 4, a lower extension arm 8 and a suspension arm 6 for suspension; a tension spring 7; a sliding support ring 9; bolt hole 3; fixing bolt 2; soluble pin 10; and lower joint 11;

The outer sleeve at the upper end of the pipe body 1 and the lower joint 11 at the lower end, the upper side wall of the outer sleeve at the upper end is provided with a bolt hole 3, and the lower side wall of the lower joint 11 at the lower end is also provided with a bolt hole 3, and the bolt hole 3 is provided at The outer sleeve at the upper end and the side wall of the lower joint at the lower end;

The upper expansion arm 4, the lower expansion arm 8 and the suspension arm 6; the tension spring 7; the sliding support ring 9, closely fit; interconnected and cooperate to slide;

The sliding support ring 9; the outer sleeve at the upper end of the pipe body 1; the lower joint 11 and the tension spring 7 are provided with a first limiting portion 12 and a second limiting portion 13 at the lower end for limiting the position of the sliding supporting ring 9;

The fixing bolt 2; the outer sleeve at the upper end of the pipe body 1; the lower joint 11; fixedly connected with the casing;

The soluble pin 10; the sliding support ring 9; and the lower joint 11; fixedly connected with the casing;

The tension spring 7; connects the upper expansion arm 4 and the lower expansion arm 8; slides up and down.

In this embodiment, when the utility model is lowered into an oil well or a natural gas well, the sliding support ring 9 is stuck at the position of the first limiting part 12, which ensures that when the utility model is initially lowered into an oil well or a natural gas well, the outer diameter is the smallest; into the bottom of the well. After running into the oil well or natural gas well, the soluble pin 10 meets the cement; the soluble pin 10 is melted; the sliding support ring 9 is released; the tension spring 7 shrinks, and the sliding support ring 9 moves from the first limiting part 12 to the second The limit part 13 slides; at the same time, the upper extension arm 4, the suspension arm 6, and the lower extension arm 8 shrink toward the central position of the pipe body under the guidance of the force of the tension spring; the suspension arm is supported to expand outward and support the casing string, Forcibly supporting, suspending, righting, and centering the string of casings.

Compared with the existing technology, the casing suspension device provided by the utility model has the following advantages:

1. The casing is run in one trip, and the operation is completed continuously in one trip, which saves time;

2. No need for ground pressure or hydraulic opening;

3. There is no need to drill holes in the casing body, and there are no pressure transmission holes, which will not pollute the formation;

4. There is no limit to the number of running, and it is not affected by the wall thickness, thread and material of the casing;

5. It is not affected by the diameter change of the naked eye and has good passability;

6. Before the cement cementing begins, the casing suspension device remains in a contracted state with the smallest outer diameter; it is convenient for casing running;

7. After the cement cementing starts, the soluble pins will melt and break when they meet the cement; the casing suspension device maintains the expanded state, and the outer diameter is the largest; the casing string is suspended, righted and centered;

8. Effectively improve the centering degree of the casing, stabilize the centralizing force, improve the cementing quality, and prolong the life of the production well;

7. There is no seal; it is suitable for deep water, high temperature and high pressure, high-inclination, and horizontal wells.

The soluble pin 10 is made of soluble metal.

After a few days, the broken soluble pins are dissolved in the well fluid, which can ensure that there will be no residual debris in the wellbore to the greatest extent, and can effectively ensure the cleanliness and smoothness of the oil and gas well.

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

Claims (8)

1. A casing suspension device, characterized in that it comprises: a pipe body, an extension arm for righting and centering, a suspension arm, etc.; The upper end and the lower end of the pipe body are respectively equipped with bolt holes, and the fixing bolts pass through the bolt holes opened on the side wall of the upper end to fix the upper end and the lower end of the pipe body with the casing; The expansion arm and the suspension arm are connected by fixing pins; the upper end of the pipe body is connected with the expansion arm through the fixing pin; the lower end of the pipe body is connected with the expansion arm through the fixing pin; The pin connection can be rotated; The extension arm at the lower end is connected to the sliding support ring through a fixed pin to be rotatable; the sliding support ring restricts the extension arm, the first stopper and the second stopper where the cantilever arm is in position. 2. The casing suspension device according to claim 1, wherein the pipe body is made of metal. 3. The bushing suspending device according to claim 1 or 2, characterized in that, the soluble pin is made of soluble metal material. 4. The casing suspension device according to claim 3, wherein the first limiting part is the lower end of a cylinder arranged along the outer wall of the tube, and the second limiting part is arranged along the outer wall of the tube The upper end of the cylindrical body, the sliding support ring slides from bottom to top (or inversion: top to bottom) on the first limiting part and the second limiting part. 5. The second limiting part according to claim 4, characterized in that, the expansion arm and the suspension arm are located at the expanded position; the outer diameter is the largest; the casing is suspended, righted and centered. 6 . The casing suspension device according to claim 5 , characterized in that, the expansion arm and the suspension arm are not opened during the running process and the mud circulation process. 7 . 7. The casing suspension device according to claim 6, characterized in that its outer diameter is small; it can effectively reduce running friction. 8. The casing suspension device according to claim 1, characterized in that the pipe body is easy to install, easy to use, and does not require additional construction equipment.