CN211573449U

CN211573449U - Coiled tubing tractor, through-scraping well-washing device and transmission perforating device

Info

Publication number: CN211573449U
Application number: CN201922452788.0U
Authority: CN
Inventors: 宋丹; 卢秀德; 李源源; 邹先雄; 李剑秋; 孙兆岩; 裴楚洲
Original assignee: China National Petroleum Corp; CNPC Chuanqing Drilling Engineering Co Ltd
Current assignee: China National Petroleum Corp; CNPC Chuanqing Drilling Engineering Co Ltd
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2020-09-25
Anticipated expiration: 2029-12-30

Abstract

The utility model provides a coiled tubing tractor, logical scraping well-washing device and transmission perforating device. The tractor comprises a first centralizer, a central tube, a wrist, a circulation hole and a second centralizer; the inside of the central tube is of a hollow structure; the first centralizer and the second centralizer are respectively connected with two ends of the central pipe, and fluid channels communicated with the central pipe are arranged inside the first centralizer and the second centralizer; the leather wrist is positioned on the outer side of the pipe wall of the central pipe between the first centralizer and the second centralizer; the circulation hole is formed in the pipe wall of the central pipe between the leather wrist and the second centralizer. The well cleaning device and the transmission perforating device both comprise tree search coiled tubing tractors. The tractor of the utility model has simple structure and easy processing and manufacturing; the through-scraping well-washing device can save the occupied time of a drilling machine and the transportation cost of the drilling tool, and can save the drilling cost; the transmission perforating device can ensure that the perforating pipe string reaches the target depth, and can well complete the transmission perforating work.

Description

Coiled tubing tractor, through-scraping well-washing device and transmission perforating device

Technical Field

The utility model belongs to the technical field of oil and gas construction in the pit, more specifically say, relate to a coiled tubing tractor, logical scraping well-flushing device and transmission perforation device.

Background

Shale gas development is currently dominated by drilling horizontal wells to increase single well production. When a horizontal well is drilled, a geosteering technology is generally adopted to improve the drilling encounter rate. I.e., multiple platform wells are drilled in a block, often as many as 8 wells per platform. In order to control the area of the platform well, some horizontal sections of the well have to be drilled in the direction of the upward inclination of the formation. The current method is to adopt a coiled tubing to carry out transmission perforation on a first construction section, then carry out sand fracturing, and from a second section, in order to improve the construction timeliness, a pumping bridge plug and a perforation tube string are often adopted to complete bridge plug setting and perforation. In addition, because the drilling machine is busy, in order to reduce the time occupied by the drilling machine, the previous scraping and washing work of a new well is sometimes finished by a coiled tubing machine. For a well with a horizontal section which is basically horizontal and the length of which is about 1500m or a well which is declined, the locking phenomenon of the coiled tubing can not occur basically in the running process, but in the well with a long horizontal section and a well with an upward horizontal section, the coiled tubing can be locked in the running process and can not be run to the target well depth.

Although the friction force between the coiled tubing and the well wall is reduced by adopting the metal drag reducer, the lowering capability of the coiled tubing in the upwarp well is greatly improved, but the coiled tubing still cannot be lowered to the target well depth for the well with large upwarp amplitude. The running depth of the coiled tubing in a long horizontal section well or a horizontal section upwarp well can be greatly increased by using the hydraulic oscillator, but the increasing depth is limited, and the coiled tubing still cannot run to the target well depth in some wells with large upwarp amplitude and long horizontal sections. And may not allow the coiled tubing to vibrate vigorously while running the string, thereby limiting the use of the hydro oscillator and limiting the horizontal length of such well completions.

SUMMERY OF THE UTILITY MODEL

To overcome the deficiencies in the prior art, one of the objects of the present invention is to solve one or more of the problems of the prior art. For example, an object of the present invention is to provide a coiled tubing tractor capable of ensuring that coiled tubing can be lowered to the bottom of an artificial well or the depth of a target well in an oil and gas well with coiled tubing tilted up in a horizontal section, which is particularly suitable for the traction of coiled tubing in an oil and gas well with a long horizontal section and a horizontal well section tilted up.

In order to achieve the above objects, an aspect of the present invention provides a coiled tubing tractor, which may include a first centralizer, a central tube, a wrist, a circulation hole, and a second centralizer, wherein an inside of the central tube has a hollow structure; the first centralizer and the second centralizer are respectively connected with two ends of the central pipe, and fluid channels communicated with the central pipe are arranged inside the first centralizer and the second centralizer; the leather wrist is positioned on the outer side of the pipe wall of the central pipe between the first centralizer and the second centralizer; the circulation hole is formed in the pipe wall of the central pipe between the leather wrist and the second centralizer, and the circulation hole is communicated with the hollow structure of the central pipe.

In an exemplary embodiment of the coiled tubing tractor of the present invention, the two ends of the center tube may be threaded with a first centralizer and a second centralizer, respectively.

In an exemplary embodiment of the coiled tubing tractor of the present invention, the water grooves may be equally distributed along the circumferential direction on the outer sides of the first centralizer and the second centralizer.

In an exemplary embodiment of the coiled tubing tractor of the present invention, the wrist may be a cone structure, and the wrist can extend and retract along the diameter direction of the central tube.

In an exemplary embodiment of the coiled tubing tractor of the present invention, the number of the circulation holes is 1 to 3. Another aspect of the present invention provides a through-scrape well-washing device, which may include the coiled tubing tractor, the tube scraper, the coiled tubing joint, and the coiled tubing as described above, wherein the tube scraper is connected to the first centralizer of the tractor; one end of the coiled tubing joint is connected with one end, far away from the central tube, of the second centralizer, and the other end of the coiled tubing joint is connected with the coiled tubing.

In an exemplary embodiment of the through-scrape well-washing device of the present invention, the through-scrape well-washing device may further include a coiled tubing hydraulic emergency detacher and a coiled tubing check valve, wherein one end of the coiled tubing hydraulic emergency detacher is connected to one end of the second centralizer far from the central tube, and the other end of the coiled tubing hydraulic emergency detacher is connected to the coiled tubing check valve; one end of the coiled tubing check valve is connected with the other end of the coiled tubing hydraulic emergency release device, and the other end of the coiled tubing check valve is connected with the coiled tubing joint.

Yet another aspect of the present invention provides a coiled tubing conveying perforating device, which may include the coiled tubing tractor, a perforating string, a buffer, a coiled tubing joint, and a coiled tubing as described above, wherein the perforating string is connected to a first centralizer of the tractor; one end of the buffer is connected with one end, far away from the central pipe, of the second centralizer, and the other end of the buffer is connected with the coiled tubing joint; one end of the coiled tubing joint is connected with the other end of the buffer, and the other end of the coiled tubing joint is connected with the coiled tubing.

In an exemplary embodiment of the coiled tubing transmission perforating device of the present invention, the transmission perforating device may further include a coiled tubing hydraulic emergency release and a coiled tubing check valve, wherein one end of the coiled tubing hydraulic emergency release is connected to the buffer, and the other end of the coiled tubing hydraulic emergency release is connected to the coiled tubing check valve; one end of the coiled tubing check valve is connected with the other end of the coiled tubing hydraulic emergency release device, and the other end of the coiled tubing check valve is connected with the coiled tubing joint.

Compared with the prior art, the beneficial effects of the utility model include:

(1) the tractor of the utility model has simple structure and easy processing and manufacturing; the tractor of the utility model can be used without using a hydraulic oscillator and a metal drag reducer, thereby saving the cost;

(2) the tractor of the utility model can improve the running capability of the coiled tubing in the long horizontal section well and the horizontal section upwarp well, and solves the problem that the coiled tubing can not run to the artificial bottom or the target well depth due to locking in the oil-gas well with the horizontal section upwarp;

(3) the through-scraping well-washing device of the utility model can save the occupied time of the drilling machine and the transportation cost of the drilling tool, and can save the drilling cost;

(4) the utility model discloses a transmission perforating device can ensure that the perforating pipe cluster arrives the target depth down, completion transmission perforation work that can be fine.

Drawings

The above and other objects and features of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:

FIG. 1 illustrates a schematic view of a coiled tubing tractor according to an exemplary embodiment of the present invention;

3 FIG. 3 2 3 is 3 a 3 cross 3- 3 sectional 3 view 3 taken 3 along 3 line 3 A 3- 3 A 3 of 3 FIG. 3 1 3; 3

Fig. 3 is a cross-sectional view taken along line B-B of fig. 1.

Description of reference numerals:

1-a first centralizer, 2-a central tube, 3-a wrist, 4-a circulation hole, 5-a second centralizer, 6-a centralizing boss and 7-a water tank.

Detailed Description

Hereinafter, a coiled tubing tractor, a through-scrape well-washing device, and a transfer perforating device according to the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments.

Figure 1 illustrates a coiled tubing tractor according to an exemplary embodiment of the present invention. 3 fig. 3 2 3 is 3 a 3 cross 3- 3 sectional 3 view 3 taken 3 along 3 line 3 a 3- 3 a 3 of 3 fig. 3 1 3. 3 Fig. 3 is a cross-sectional view taken along line B-B of fig. 1.

An aspect of the utility model provides a coiled tubing tractor. In an exemplary embodiment of the coiled tubing tractor of the present invention, as shown in fig. 1 (the upper portion of fig. 1 is a cross-sectional view of the coiled tubing tractor), the coiled tubing tractor may include: a first centralizer 1, a central tube 2, a wrist 3, a circulation hole 4 and a second centralizer 5, wherein,

the interior of the central tube 2 may be provided as a hollow structure. The hollow structure enables the circulation of liquid inside the central tube 2.

The first centralizer 1 and the second centralizer 5 are respectively arranged at two ends of the central pipe 2. The first centralizer 1 can be sleeved with one end of the central pipe 2, and the second centralizer 5 can be sleeved with the other end of the central pipe 2. The central tube 2 may be threaded at both ends with a first centralizer 1 and a second centralizer 2, respectively, for example, a 2-3/PAC threaded connection may be used. And a flow passage which can enable liquid to flow is arranged in the middle of the first centralizer 1 and the second centralizer 5. The flow channels provided in the first centralizer 1 and the second centralizer 5 communicate with each other and the hollow structure in the central tube 2.

The leather wrist 3 can be embedded on the pipe wall of the central pipe 2. The wrist 3 may be located between the first centralizer 1 and the second centralizer 5. The wrist 3 can stretch along the pipe diameter direction of the central pipe 2. The wrist 3 can be used for sealing an annular space between the outer side of the wrist 3 and a shaft due to the fact that the wrist can stretch along the pipe diameter direction.

The circulation holes 4 are arranged on the wall of the central tube 2. The circulation holes 4 penetrate through the wall of the central pipe 2 and are communicated with the hollow structure of the central pipe 2. The number of the circulation holes 4 may be plural, for example, 1 to 3. The number and the aperture of the circulation holes can be set according to the working displacement of the coiled tubing during operation.

Above, the utility model discloses a tractor realizes that towed principle includes: when the annulus between the tool string (formed by the coiled tubing in combination with the tractor) and the wellbore is pumped with fluid, the fluid enters the base pipe through the circulation holes and returns to the surface through the coiled tubing. When fluid passes through the circulation hole, throttling pressure difference is formed between an inlet and an outlet of the circulation hole, the pressure of the upper annular space of the pitman is larger than the pressure below the pitman, and due to the existence of the pressure difference, the tractor is pushed by the fluid to move downwards to assist in lowering the coiled tubing to the target well depth.

In this embodiment, the outer surface of the first centralizer 1 may be equally distributed with centralizing bosses 6 and water tanks 7 along the circumferential direction, and the water tanks are disposed between the centralizing bosses 6, as shown in fig. 2. Also, the outer surface of the second centralizer 5 may be equally distributed with centralizing bosses 6 and water grooves 7 along the circumferential direction, as shown in fig. 3.

Another aspect of the present invention provides a well cleaning device, in an exemplary embodiment of the present invention, the well cleaning device comprises a pipe scraper, a coiled tubing tractor, a coiled tubing joint and a coiled tubing. Wherein the scraper is connected with a first centralizer of a tractor. The scraper may be connected to the first centralizer by a screw thread. One end of the coiled tubing joint is connected with one end, far away from the central tube, of the second centralizer, and the other end of the coiled tubing joint is connected with the coiled tubing.

In this embodiment, the through-scrape well-washing device may further include a coiled tubing hydraulic emergency release and a coiled tubing check valve. The pipe scraper, the coiled tubing tractor, the coiled tubing hydraulic emergency release device, the coiled tubing check valve, the coiled tubing joint and the coiled tubing are sequentially connected. For example, threaded connections may be used for each. One end of the coiled tubing hydraulic emergency release device is connected with one end, far away from the central pipe, of the second centralizer, and the other end of the coiled tubing hydraulic emergency release device is connected with the coiled tubing check valve. One end of the coiled tubing check valve is connected with the other end of the coiled tubing hydraulic emergency release device, and the other end of the coiled tubing check valve is connected with the coiled tubing joint.

Specifically, a pipe scraper matched with the inner diameter of the casing is connected to a first centralizer (the first centralizer can be used as a lower joint of a tractor), and a coiled tubing hydraulic emergency release tool (a coiled tubing hydraulic emergency release device), a coiled tubing check valve, a coiled tubing joint and coiled tubing are sequentially connected to the upper part of a second centralizer (the first centralizer can be used as an upper joint of the tractor). And (4) putting the tool string consisting of the components into the well to start the operation of scraping and washing. In the operation process, a valve in the flow from the coiled tubing to the outlet is opened, and when the coiled tubing is difficult to feed, the suspended weight obviously decreases and the depth of the tubing slowly increases or does not increase, the locking is basically judged to occur. At the moment, the annular small-displacement pump injection is carried out on the coiled tubing and the shaft, whether the hanging weight is obviously reduced or not is observed, if the hanging weight is obviously reduced, the coiled tubing can be slowly lowered, the traction force required by the coiled tubing is increased along with the increase of the lowering depth, the displacement can be gradually increased, and the pressure difference between the inside and the outside of the coiled tubing is increased, so that the traction force is increased. But the pressure difference should be controlled within a reasonable range to prevent the coiled tubing from being crushed. And after the well is flushed to the bottom of the artificial well, the well shaft is cleaned through reverse circulation, and after the well is flushed, the metal drag reducer is pumped into the reverse circulation pump and is jacked to the horizontal section to the deflecting section if necessary, and the coiled tubing is taken out of the well head.

Above, it should be noted that the utility model provides a scraper, the urgent hand tool of taking off of coiled tubing hydraulic pressure (the urgent hand tool of taking off of coiled tubing hydraulic pressure), coiled tubing single current valve, coiled tubing connect and coiled tubing all can be current device.

Another aspect of the present invention provides a coiled tubing transfer perforating device. In an exemplary embodiment of the coiled tubing conveyed perforating device of the present invention, the conveyed perforating device comprises a string of sequentially connected perforating tubes, a coiled tubing tractor, a buffer, a coiled tubing joint, and coiled tubing as described above. The perforating pipe string is connected with a first centralizer of the tractor. One end of the buffer is connected with one end, far away from the central pipe, of the second centralizer, and the other end of the buffer is connected with the coiled tubing joint. One end of the coiled tubing joint is connected with the other end of the buffer, and the other end of the coiled tubing joint is connected with the coiled tubing.

In this embodiment, the perforating string is a perforating apparatus commonly used in the art. For example, a perforating string may be a deep-hole string consisting of a primer tail, a body, a butt joint, and an initiator. In this embodiment, the delivery perforating device may further include a coiled tubing hydraulic emergency release and a coiled tubing check valve. The perforating pipe string, the connecting buffer, the coiled tubing hydraulic emergency release tool (coiled tubing hydraulic emergency release), the coiled tubing check valve, the coiled tubing joint and the coiled tubing are sequentially connected. May be connected to each other by means of a screw thread.

Specifically, if the target depth is not reached after the use of the metal drag reducer and the hydraulic shaker, the string of perforations may be connected to a first centralizer (where the first centralizer may be the lower sub of the tractor) that in turn connects a buffer, a coiled tubing hydraulic emergency release tool, a coiled tubing check valve, a coiled tubing joint, coiled tubing above a second centralizer (where the first centralizer may be the upper sub of the tractor), according to software simulation results. When the coiled tubing is difficult to feed, the suspended weight obviously decreases and the depth of the tubing is slowly increased or not increased, the locking is basically judged to occur. At the moment, the annular small-displacement pump injection is carried out on the coiled tubing and the shaft, whether the hanging weight is obviously reduced or not is observed, if the hanging weight is obviously reduced, the coiled tubing can be slowly lowered, the traction force required by the coiled tubing is increased along with the increase of the lowering depth, the displacement can be gradually increased, the pressure difference between the inside and the outside of the coiled tubing is increased, the traction force is increased, but the pressure difference is controlled within a reasonable range, and the coiled tubing is prevented from being damaged by extrusion. After the perforating pipe string is lowered to the bottom of the artificial well, the perforating pipe string is lifted up to be aligned with the first section of the first cluster, the detonating perforating gun is suppressed, and the perforating pipe string is aligned with the first section of the second cluster and the third cluster respectively to carry out delayed detonating perforation.

Above, it should be noted that the utility model discloses a perforation pipe cluster, buffer, coiled tubing hydraulic pressure emergency release hand instrument (coiled tubing hydraulic pressure emergency release hand ware), coiled tubing single current valve, coiled tubing connect and coiled tubing all can be current device.

In summary, the tractor of the utility model has simple structure, easy processing and manufacturing, and can save cost without using a hydraulic oscillator and a metal drag reducer; the coiled tubing can be lowered into a long horizontal section well and a horizontal section upturned well, and the problem that the coiled tubing cannot be lowered to an artificial well bottom or a target well depth due to locking in the oil-gas well with the coiled tubing upturned in the horizontal section is solved. The through-scraping well-washing device of the utility model can save the occupied time of the drilling machine and the transportation cost of the drilling tool, and can save the drilling cost; the utility model discloses a transmission perforating device can ensure that the perforating pipe cluster arrives the target depth down, completion transmission perforation work that can be fine.

Although the present invention has been described above in connection with exemplary embodiments, it will be apparent to those skilled in the art that various modifications and changes may be made to the exemplary embodiments of the present invention without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A coiled tubing tractor is characterized by comprising a first centralizer, a central tube, a wrist, a circulation hole and a second centralizer, wherein,

the inner part of the central tube is of a hollow structure;

the first centralizer and the second centralizer are respectively connected with two ends of the central pipe, and fluid channels communicated with the central pipe are arranged inside the first centralizer and the second centralizer;

the leather wrist is positioned on the outer side of the pipe wall of the central pipe between the first centralizer and the second centralizer;

the circulation hole is formed in the pipe wall of the central pipe between the leather wrist and the second centralizer, and the circulation hole is communicated with the hollow structure of the central pipe.

2. The coiled tubing tractor of claim 1, wherein both ends of the base pipe are threaded with a first centralizer and a second centralizer, respectively.

3. The coiled tubing tractor of claim 1, wherein water troughs are evenly distributed along the circumferential direction on the outer sides of the first centralizer and the second centralizer.

4. The coiled tubing tractor of claim 1, wherein the wrist is a cone structure, and the wrist can extend and retract along the diameter direction of the central tube.

5. The coiled tubing tractor of claim 1, wherein the number of circulation holes is 1-3.

6. A lead-through wiper well cleaning apparatus, characterized in that it comprises a coiled tubing tractor, a pipe scraper, a coiled tubing joint and coiled tubing according to any of claims 1 to 5, wherein,

the scraper is connected with a first centralizer of the coiled tubing tractor;

one end of the coiled tubing joint is connected with one end, far away from the central tube, of the second centralizer, and the other end of the coiled tubing joint is connected with the coiled tubing.

7. The lead-scrape well-washing device of claim 6, further comprising a coiled tubing hydraulic emergency release and a coiled tubing check valve, wherein,

one end of the coiled tubing hydraulic emergency release device is connected with one end, far away from the central pipe, of the second centralizer, and the other end of the coiled tubing hydraulic emergency release device is connected with a coiled tubing check valve;

one end of the coiled tubing check valve is connected with the other end of the coiled tubing hydraulic emergency release device, and the other end of the coiled tubing check valve is connected with the coiled tubing joint.

8. Coiled tubing conveyed perforating device, characterized in that the conveyed perforating device comprises a coiled tubing tractor, a perforating string, a buffer, a coiled tubing joint and a coiled tubing according to any of claims 1 to 5, wherein,

the perforating pipe string is connected with a first centralizer of the coiled tubing tractor;

one end of the buffer is connected with one end, far away from the central pipe, of the second centralizer, and the other end of the buffer is connected with the coiled tubing joint;

one end of the coiled tubing joint is connected with the other end of the buffer, and the other end of the coiled tubing joint is connected with the coiled tubing.

9. The coiled tubing conveyed perforating device of claim 8, further comprising a coiled tubing hydraulic emergency release and a coiled tubing check valve, wherein,

one end of the coiled tubing hydraulic emergency release device is connected with the buffer, and the other end of the coiled tubing hydraulic emergency release device is connected with the coiled tubing check valve;