CN219220366U - Ball-throwing-free oil sleeve annulus communication device for underground operation - Google Patents

Abstract

The utility model relates to a ball-free oil sleeve annular communication device for underground operation, which is provided with an inner sliding sleeve, wherein the outer wall of the inner sliding sleeve is provided with a sealing ring and is arranged outside a central tube and connected with an outer sleeve through a fixed shear pin; an inner circulation hole is formed in the pipe body of the central pipe, the upper part of the central pipe is provided with a connector, the lower part of the central pipe is provided with external threads, and the connector is provided with internal threads and external threads; the outer sleeve is connected with the central tube through a connector; the inner sliding sleeve arranged outside the central tube is blocked at the outer circulation hole of the outer sleeve. The device does not need to be provided with a ball seat and a sealing ball, does not need to control the switch of the device through a hydraulic control pipeline or press a circulating channel between a communicating oil pipe and a sleeve through the ball seat and the steel ball, is very suitable for a highly-inclined well, a horizontal well and a production pipe column with more oil dirt and impurities in the well to establish the circulating channel, effectively improves the primary success rate of underground operation construction, and has obvious use effect and application value.

Description

A ball-free casing annulus communication device for downhole operation

technical field

The utility model belongs to a tool for connecting the annular space of an oil casing in the downhole workover operation of the petroleum industry, in particular to a device for connecting the annular space of the oil casing without throwing balls for downhole operation.

Background technique

With the advancement of oilfield development technology, the operating workload of offshore and onshore horizontal wells and highly deviated wells has increased year by year. It is a common tool to establish the circular space between the wells and the circulation well flushing channel.

At present, in the downhole operation site, commonly used sliding sleeves include: a hydraulic sliding sleeve controlled by a hydraulic control pipeline and a pressing sliding sleeve with a pressing ball seat in the inner cavity. During the construction process at the production site, the defects in the use of the sliding sleeves of the two structures are as follows:

1. Problems in the use of hydraulic sliding sleeves:

① Due to the increase of horizontal wells and high-inclination wells, the hydraulic sliding sleeve is prone to eccentric wear due to the influence of the wellbore trajectory during the downhole process, resulting in wear and tear of the hydraulic control pipeline, resulting in rework of the operation and high The amount of downhole operation costs was lost, and the construction period was delayed, resulting in huge losses;

②. It is very difficult to send hydraulic pressure to open the hydraulic sliding sleeve through the hydraulic control pipeline, and it is very easy to cause the sliding sleeve to fail to open, and the underground circulation channel cannot be connected; therefore, the hydraulic sliding sleeve can only be used in shallow wells section, not applicable to deep well sections.

2. The use problems of the pressing sliding sleeve with ball seat:

①. During the downhole operation of horizontal wells and high-inclination wells, due to the influence of well deviation and wellbore trajectory, the pressure-type sliding sleeve with ball seat is prone to steel balls not entering the ball seat smoothly, resulting in the failure of the sliding sleeve to be pressed and opened. ②. Affected by the oil scale and impurities in the wellbore, the seal between the steel ball and the ball seat is not tight or not sealed, and the sliding sleeve cannot be opened through the pressure of the liquid sent in the downhole operation string, resulting in the construction The failure brought high downhole operation cost loss, and also delayed the construction period, resulting in huge losses.

In order to solve the above problems, the following related patent technologies have appeared: the sliding sleeve, the rotary stepping sliding sleeve and the fracturing sliding sleeve disclosed in the patent No. CN201820745983. Due to the limitation of different sizes of fracturing balls, the number of fracturing stages used by the fracturing mechanism is limited.

However, the structure and operation of the above-mentioned devices are relatively complicated, and are not suitable for routine operations in oil and water wells and for use in production strings.

Patent No. CN201810379092.7 discloses a repeatable switchable sliding sleeve mechanism for casing sliding sleeves. The invention solves the problems of existing casing sliding sleeve tools that cannot be closed, and the completion string cannot maintain full diameter, etc. , which can effectively reduce the construction costs of wellbore treatment and layer plugging in the oil and gas field.

However, the above-mentioned device has a large external dimension and is not suitable for oil, gas and water well operations and commissioning in the casing.

Patent No. CN201310023553.4 discloses a sliding sleeve control tool and a hydraulically controlled sliding sleeve that can be overridden. The switching action of the sliding sleeve can be realized by lifting or lowering the oil pipe or coiled tubing; this can avoid the traditional sliding sleeve control tool. The defect of misoperation is eliminated, and the work efficiency is improved, and the operation is simple and convenient.

The device of the above invention is easy to operate, but it needs to lift and release the pipe string many times during the operation of the oil and water well, so that the above device is frequently switched on and off, which may easily cause the failure of the downhole measure operation; and because the production pipe string cannot be lifted and released after being lowered into the well, The above devices cannot be applied to production strings.

Patent No. CN201210113663.5 discloses a multi-flow hole sliding sleeve and a horizontal well multi-stage fracturing sliding sleeve string, belonging to the field of oil and gas field production equipment. Utilizing the above-mentioned device of the invention does not need to modify the existing wellhead and running pipe string, which is of great significance for improving the fracturing effect and has broad application prospects.

However, the above-mentioned device is complicated to operate, is suitable for fracturing construction, and is not suitable for use in conventional operations of oil and water wells and production strings.

Therefore, it is necessary to invent a ball-free oil-casing annulus communication device, which does not need to be attached to ball seats and balls to suppress operations. By pressing and opening the sliding sleeve in the production string, the oil pipe and the casing are connected to establish a circulation channel.

Contents of the invention

The purpose of this utility model is to provide a ball-free oil casing annulus communication device for downhole operations. There is no sealing ball in the device, and there is no need to control its switch through a hydraulic control pipeline or press the ball seat and steel ball to connect the oil pipe and casing. The circulation channel between the pipes can be used in highly deviated wells, horizontal wells, and production pipe strings with a lot of oil and impurities deposited on the pipe wall, improving the first-time success rate of downhole operations, improving work efficiency, and reducing workover operations. cost.

The purpose of this utility model is achieved in this way: a ball-free oil sleeve annulus communication device for downhole operation is provided with an inner sliding sleeve, wherein: the outer wall of the inner sliding sleeve is equipped with a sealing ring and is installed on the outside of the central pipe and the outer casing Connected by fixed shear nails; the body of the central tube is provided with an internal circulation hole and the upper part is a connector, the lower part is provided with an external thread, and the connector is provided with an internal thread and an external thread; the tube body of the outer casing is provided with an external circulation hole , the outer casing and the central pipe are connected through a joint; the inner sliding sleeve installed outside the central pipe is blocked at the outer circulation hole of the outer casing.

Preferably, the outer wall of the central pipe is a non-equal diameter outer wall, and the outer wall below the connecting head is gradually reduced, and the inner sliding sleeve is installed under the outer wall of the pipe where the internal circulation hole is set; when the inner sliding sleeve is installed outside the central pipe , can form a clamping wall cavity between the central tube and the outer tube for the inner circulation hole.

Preferably, more than two internal circulation holes are set in the central pipe.

Preferably, the inner sliding sleeve is provided with the same number of shear nail holes as the number of fixed shear nails, and the fixed shear nails can be loaded therein; the sealing ring is provided with at least two inner slides evenly distributed and installed under the shear nail holes. In the outer wall of the sleeve, when the inner sliding sleeve is connected between the central tube and the outer sleeve through fixed shear nails, the sealing ring is just located on both sides of the outer circulation hole.

Preferably, a set of shear nail holes in the outer wall of the inner sliding sleeve is arranged above the sealing ring; the number of the set of shear nail holes is set to be more than three, and the diameter of the shear nail holes and the fixed shear nail The outer diameter and the number of installations are determined by the running depth of the ball-free oil jacket annulus communication device connected in the production string.

Preferably, two sets of shear nail holes are provided on the outer wall of the inner sliding sleeve and are respectively arranged above and below the seal rings on both sides of the outer circulation hole, and the shear nail holes located below the seal ring are replaced by shear nail holes. The set number and position of the replacement shear nail holes are the same as the shear nail holes above the sealing ring, and no fixed shear nails are installed in the replacement shear nail holes.

Preferably, the upper inner cavity of the outer sleeve is provided with internal threads and can be connected with the outer threads in the connector, the central hole in the lower part of the outer sleeve can be inserted into the central tube, and the central hole in the lower part of the outer sleeve and the central tube For clearance fits.

Preferably, there are more than two external circulation holes in the outer casing.

Preferably, the height of the inner cavity below the outer circulation hole in the outer casing is greater than or equal to the height of the inner sliding sleeve.

Preferably, both the external thread on the lower part of the central pipe and the internal thread on the upper connecting head are tubing threads, the internal thread and the external thread on the connecting head are alternately arranged in the inner cavity and the outer wall of the connecting head, and the internal thread on the connecting head is arranged The body of the thread is higher than the body of the outer sleeve.

Compared with the prior art, the utility model has the following remarkable use effects: the utility model is a ball-free oil sleeve annulus communication device, in which there are no ball seats and sealing balls, and there is no need to control it through hydraulic control pipelines. The switch or the circulation channel between the tubing and the casing is connected by pressing the ball seat and the steel ball. It is very suitable for highly deviated wells, horizontal wells and production strings with a lot of oil and impurities in them. Only relying on the connection between the tubing and casing The pressure difference between them is fed from the production tubing string, and the inner sliding sleeve is knocked down after the pressure is suppressed, so that the tubing and the casing can be connected to establish a circulation channel.

The device can be used in high-inclination wells, horizontal wells, and production strings with a lot of oil and impurities deposited on the pipe wall, and can conveniently establish a circulation channel between the tubing and casing, effectively improving the construction efficiency of downhole operations. One time success rate.

The utility model has the characteristics of simple structure, easy processing, detachable and replaceable fixed shear nails and repeated use; in order to facilitate the removal and replacement of fixed shear nails, the outer wall of the inner sliding sleeve and the outer circulation hole in the outer casing are provided with two corresponding holes. Set the shear nail holes, so that the front and back of the inner sliding sleeve can be connected and installed in the outer casing. At the same time, the application of the device in different well depths can be satisfied according to the shear force required for fixing the shear nails.

In summary, the device has a simple structure, no sealing ball, convenient construction, and a high success rate of one-time construction, which can avoid the need to control its switch through the hydraulic control pipeline or press the ball seat and steel ball to connect the oil pipe and the bushing. The use defect of the sliding sleeve device of the circulation channel between the pipes avoids various adverse consequences caused by the failure to open the circulation channel, significantly shortens the construction time and reduces the cost of downhole operation, and has a significant use effect and application value.

Description of drawings

The accompanying drawings are used to provide a further understanding of the utility model, and constitute a part of the description, and are used to explain the utility model together with the embodiments of the utility model, and do not constitute a limitation to the utility model. In the accompanying drawings: Fig. 1 is a structural representation of the utility model.

In the figure: connector 1, inner circulation hole 2, fixed shear nail 3, outer circulation hole 4, outer sleeve 5, sealing rubber ring 6, inner sliding sleeve 7, central tube 8, replacement shear nail hole 9.

Detailed ways

The accompanying drawings are for reference and description only, and are not intended to limit the protection scope of the present utility model. The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, 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 order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

In describing the present invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical" , "horizontal", "top", "bottom", "inner", "outer" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limiting the present invention. In addition, in the description of the present utility model, "plurality" means two or more, unless otherwise specifically defined.

Referring to Fig. 1, a ball-free oil casing annulus communication device for downhole operation is provided with an inner sliding sleeve 7, wherein: the outer wall of the inner sliding sleeve 7 is equipped with a sealing ring 6 and installed on the outside of the central pipe 8 to pass through the outer casing 5 Fixed shear nails 3 are connected; the pipe body of the central pipe 8 is provided with an internal circulation hole 2 and the upper part is a connecting head 1, and the lower part is provided with external threads, and the connecting head 1 is provided with internal threads and external threads; in the pipe body of the outer casing 5 An outer circulation hole 4 is provided, and the outer casing 5 and the central pipe 8 are connected through a connector 1; the inner sliding sleeve 7 installed outside the central pipe 8 is blocked at the outer circulation hole 4 of the outer casing 5.

As the oil casing annulus communication device for downhole operation, there is no sealing ball in this device, and the ball-free oil casing annulus communication device after assembly is used to block the outer circulation hole 4 in the outer casing 5 through the inner sliding sleeve 7 , The inner sliding sleeve 7 and the outer casing 5 are connected by fixed shear nails 3 .

The device is connected to the downhole operation string. Since the bottom end of the downhole operation string is equipped with a plug or a single-flow tool, the downhole operation string is used to pressurize into the well, and the liquid from the downhole operation string flows from the central pipe 8. Return from the inner circulation hole 2. Under the action of the hydraulic pressure, the fixed shear nail 3 connected between the inner sleeve 7 and the outer sleeve 5 is cut off, and the inner sleeve 7 is knocked down, exposing the outer circulation hole 4. Without a sealing ball, the The communication of the annular space between the tubing and the casing forms a circulation channel, which can realize the well flushing and backwashing operations, and the annular space of the tubing and casing can be connected for the production of the production string.

Since there is no sealing ball in this device, the circulating channel has a larger internal diameter and a larger internal diameter of the circulating channel than the device in which the sealing ball is installed to realize the oil sleeve annulus communication through the sliding sleeve. It avoids all the disadvantages of sliding sleeves with sealing balls and hydraulic sliding sleeves. For example, hydraulic sliding sleeves controlled by hydraulic control pipelines are easy to wear and break, resulting in losses caused by rework in the construction process. Huge economic loss; the hydraulic control pipeline is difficult to replenish pressure and can only be used in shallow well sections, not applicable to deep well sections; due to the influence of well deviation and wellbore trajectory, the steel ball cannot smoothly enter the ball seat and cause the sliding sleeve Unable to suppress the opening problem; due to the impact of impurities in the wellbore, the steel ball and the ball seat are not tightly sealed, resulting in the inability to hold the pressure to open the sliding sleeve, resulting in process failure, etc.

The utility model is simple in structure, easy to use, does not control the opening and closing through the sealing ball, is convenient for construction, can greatly improve the construction efficiency and the success rate of construction, and avoids the huge amount caused by the inability to open the existing sliding sleeve device due to the problem of the sealing ball and the liquid control problem. Operating costs, thereby significantly reducing production costs and improving economic efficiency.

On the basis of the above-mentioned embodiment one, the utility model also has the following embodiments:

A preferred embodiment: the outer wall of the central tube 8 is a non-equal diameter outer wall, the outer wall below the connector 1 is gradually reduced, and the inner sliding sleeve 7 is installed below the outer wall of the tube where the internal circulation hole 2 is set; when the inner sliding After the sleeve 7 is installed outside the central tube 8, it can form a clamping wall cavity between the central tube 8 and the outer sleeve 5 for the inner circulation hole 2, so that the inner sliding sleeve 7 connected below is successfully knocked down, exposing the outer circulation hole 4 , to realize the communication of the oil jacket annulus.

A preferred embodiment: more than two internal circulation holes 2 are set in the central pipe 8 .

A preferred embodiment: the inner sliding sleeve 7 is provided with the same number of shear nail holes as the fixed shear nails 3 and the fixed shear nails 3 can be inserted therein; the sealing ring 6 is provided with at least two and is evenly distributed and installed on the In the outer wall of the inner sliding sleeve 7 below the shear nail hole, when the inner sliding sleeve 7 is connected between the central tube 8 and the outer sleeve 5 through the fixed shear nail 3, the sealing ring 6 is just located on both sides of the outer circulation hole 4.

A preferred embodiment: a group of shear nail holes in the outer wall of the inner sliding sleeve 7 is arranged above the sealing ring 6; the number of the group of shear nail holes is set to more than three, and the number of shear nail holes The diameter of the hole, the outer diameter of the fixed shear pin 3 and the number of installations are determined by the running depth of the ball-free casing annulus communication device connected in the production string, so that the device can be applied to different well depths.

A preferred embodiment: two groups of shear nail holes on the outer wall of the inner sliding sleeve 7 are provided above and below the seal ring 6 on both sides of the outer circulation hole 4, and the shear nail holes located below the seal ring 6 are for replacement. With the shear nail hole 9, the number and position of the shear nail hole 9 are the same as those on the top of the seal ring 6, and the fixed shear nail 3 is not installed in the shear nail hole 9 for replacement. Changing the use of the shear nail hole 9 is to facilitate the connection and installation of the inner sliding sleeve 7 in this device, that is, the inner sliding sleeve 7 can be used positively and negatively, and can be installed on the outside of the center pipe 8 no matter the positively or negatively.

A preferred embodiment: the upper inner cavity of the outer sleeve 5 is provided with an internal thread and can be connected with the external thread in the connector 1, the central hole in the lower part of the outer sleeve 5 can penetrate the central tube 8, and the lower part of the outer sleeve 5 It is a clearance fit between the center hole of the center hole and the center pipe 8.

A preferred embodiment: there are more than two external circulation holes 4 in the outer sleeve 5 .

A preferred embodiment: the height of the inner cavity below the outer circulation hole 4 in the outer casing 5 is greater than or equal to the height of the inner sliding sleeve 7 . After the inner sliding sleeve 7 is knocked off and falls into the lower inner cavity of the outer sleeve 5, the outer circulation hole 4 can be fully exposed.

A preferred embodiment: the external thread at the lower part of the central pipe 8 and the internal thread in the upper connection head 1 are oil pipe threads, and the internal thread and external thread in the connection head 1 are staggered in the inner cavity and outer wall of the connection head 1 It is set that the body of the internal thread in the connector 1 is higher than the body of the outer sleeve 5 . The connector 1 can be used as a tubing collar, the upper part of the center pipe 8 is connected to the tubing in the downhole operation string through the connector 1, and the lower part of the center pipe 8 can be connected to the tubing collar in the downhole operation string through the external thread , conveniently connect the device to the set position in the downhole operation string.

The specific usage method of this device is as follows:

The bottom of the downhole operation string or pipe string is connected to a blind plug or a single flow tool, and the device is connected to the downhole operation string and lowered to the operating depth in the operation well.

When it is necessary to carry out the reverse circulation flushing operation, the liquid is fed from the downhole operation string, and the liquid pressure enters the clamping wall cavity between the center pipe 8 and the outer casing 5 through the inner circulation hole 2 . When the liquid pressure rises to the shear value set by the fixed shear pin 3, the inner sliding sleeve 7 is further pushed downward, the fixed shear pin 3 is cut off, the inner sliding sleeve 7 descends into the lower inner cavity of the outer sleeve 5, and is 5 Limitation and accommodation. The outer circulation hole 4 communicates with the inner circulation hole 2 to form a circulation channel, which can be used for forward and backwashing operations or to allow the production string to be produced.

The embodiments described above are only typical embodiments, but the utility model is not limited to these embodiments, and those skilled in the art can make modifications without departing from the spirit and enlightenment of the utility model. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art can modify the technical solutions described in the aforementioned embodiments, or perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the creative spirit and concept of the present utility model shall be included in the protection scope of the present utility model. Accordingly, the scope of protection is not limited to the description above.

Claims (10)

1. A ball-free oil casing annulus communication device for downhole operations, which is provided with an inner sliding sleeve, and is characterized in that: the outer wall of the inner sliding sleeve is equipped with a sealing ring and is installed on the outside of the central pipe and connected with the outer casing through fixed shear nails ; The body of the central pipe is provided with an internal circulation hole and the upper part is a connector, the lower part is provided with an external thread, and the connector is provided with an internal thread and an external thread; The tubes are connected by joints; the inner sliding sleeve installed outside the center tube is blocked at the outer circulation hole of the outer tube. 2. A ball-free oil jacket annulus communicating device for downhole operations as claimed in claim 1, wherein the outer wall of the center pipe is a non-equal diameter outer wall, the outer wall below the connecting head shrinks step by step, and the inner sliding sleeve It is installed under the outer wall of the tube where the inner circulation hole is set; when the inner sliding sleeve is installed outside the center tube, it can form a clamping wall cavity between the center tube and the outer sleeve for the inner circulation hole. 3. The ball-free casing annulus communicating device for downhole operation according to claim 1 or 2, characterized in that there are more than two internal circulation holes arranged in the center pipe. 4. A ball-free oil casing annulus communication device for downhole operations according to claim 1 or 2, wherein the inner sliding sleeve is provided with the same number of shearing nail holes as the number of fixed shearing nails and wherein It can be installed with fixed shear nails; the sealing ring is arranged at least two times and evenly distributed and installed in the outer wall of the inner sliding sleeve below the shear nail hole. When the inner sliding sleeve is connected between the central tube and the outer sleeve through the fixed shear nails, The sealing ring is just located on both sides of the outer circulation hole. 5. A kind of downhole operation as claimed in claim 4, is characterized in that, the shear nail hole in the outer wall of the inner sliding sleeve is provided with a group and is arranged on the top of the sealing ring; The number of a group of shear nail holes is set to be more than three, and the diameter of the shear nail holes, the outer diameter of the fixed shear nails and the number of installations are determined by the lowering of the ball-free oil jacket annulus communication device connected in the production string. Depth decides. 6. The annulus communication device for free-balling oil sleeves for downhole operations as claimed in claim 5, wherein the shear nail holes on the outer wall of the inner sliding sleeve are provided with two sets of holes respectively arranged on both sides of the outer circulation hole. Above and below the seal ring, the shear nail holes located below the seal ring are replacement shear nail holes. The number and position of the replacement shear nail holes are the same as the shear nail holes above the seal ring. Fixed shear pins are not installed in . 7. A ball-free oil jacket annulus communication device for downhole operations according to claim 1 or 2, characterized in that the upper inner cavity of the outer casing is provided with internal threads and can be connected with the external threads in the connector. Connection, the central hole in the lower part of the outer casing can be inserted into the central tube, and the central hole in the lower part of the outer casing and the central tube are clearance fit. 8 . The ball-free casing annulus communication device for downhole operation according to claim 7 , wherein there are more than two outer circulation holes in the outer casing. 8 . 9 . The ball-free casing annulus communication device for downhole operation according to claim 8 , wherein the height of the inner cavity below the outer circulation hole in the outer casing is greater than or equal to the height of the inner sliding sleeve. 10 . 10. A ball-free oil casing annulus communication device for downhole operations as claimed in claim 3, characterized in that, both the external thread on the lower part of the center pipe and the internal thread on the upper connecting head are tubing threads, and the connecting head The inner thread and the outer thread in the connector are alternately arranged in the inner cavity and the outer wall of the connector, and the body of the connector with the inner thread is higher than the body of the outer sleeve.

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