A temporary plugging body delivery device

Abstract

The present invention provides a temporary plugging body delivery device, which relates to the technical field of fracturing temporary plugging body delivery, and includes a shell, a pushing mechanism and a core shaft. The shell is provided with a cavity, and the pushing mechanism is suitable for driving the core shaft to reciprocate in the cavity; the shell is provided with a discharge port, and the discharge port is communicated with the cavity; the core shaft is provided with a chamber, and the chamber is suitable for communicating with the discharge port when the core shaft moves to a set position. The temporary plugging body delivery device described in the present invention realizes the mechanical discharge of the temporary plugging body. For temporary plugging bodies with complex shapes such as knotted ropes, discharge can be achieved without encapsulating them into a spherical structure with beeswax. The delivery device is simple and the cost is low.

Description

Technical Field

[0001] The invention relates to the technical field of fracturing temporary plugging body delivery, and in particular to a temporary plugging body delivery device. Background Art

[0002] Fracturing refers to a method of using hydraulic force to create cracks in oil and gas layers during oil or gas production, also known as hydraulic fracturing. Fracturing is the process of artificially creating cracks in the formation to improve the flow environment of oil underground and increase the production of oil wells. It plays an important role in improving the flow conditions at the bottom of the oil well, slowing down the interlayer and improving the production of oil layers.

[0003] During the fracturing process, it is necessary to temporarily plug the cracks that have been fractured to facilitate the formation of new cracks. At present, temporary plugging bodies are often used for short-term plugging, so that the formed cracks do not affect the formation of new cracks. After a period of time, the temporary plugging bodies decompose and do not affect the collection of oil in the cracks.

[0004] However, the existing temporary plugging body delivery method is mostly to manually deliver a quantitative amount of balls into the high-pressure fracturing pipeline, which only achieves a one-time collective delivery, resulting in serious waste; and for temporary plugging bodies with irregular shapes, they need to be delivered one by one, which cannot achieve a good plugging effect, and cannot be delivered manually under high-pressure conditions. Summary of the invention

[0005] The problem solved by the present invention is that the existing temporary plugging body throwing method is mostly manual quantitative throwing into the high-pressure fracturing pipeline, which only achieves one-time collective throwing, resulting in serious waste; and for temporary plugging bodies with irregular shapes, they need to be thrown one by one, which cannot achieve a good plugging effect, and cannot be thrown manually under high-pressure conditions.

[0006] In order to solve the above problems, the present invention provides a temporary plugging body delivery device, comprising a shell, a pushing mechanism and a core shaft, wherein a cavity is provided in the shell, and the pushing mechanism is suitable for driving the core shaft to reciprocate in the cavity;

[0007] The shell is provided with a discharge port, the discharge port is communicated with the cavity, the core shaft is provided with a chamber, and the chamber is suitable for communicating with the discharge port when the core shaft moves to a set position.

[0008] The temporary plugging body delivery device described in the present invention realizes the mechanical discharge of the temporary plugging body. For temporary plugging bodies with complex shapes such as knotted ropes, discharge can be achieved without encapsulating them into a spherical structure with beeswax. The delivery device is simple and has low cost.

[0009] Furthermore, there are a plurality of chambers, and the plurality of chambers are linearly spaced and arranged, and the plurality of chambers are suitable for being connected with the discharge port in sequence when the core shaft moves.

[0010] Further, the chamber penetrates the core shaft along the radial direction of the core shaft.

[0011] Furthermore, the chamber is funnel-shaped.

[0012] Further, the shell includes an end pipe, a cross-way pipe and a first connecting pipe, and the cross-way pipe includes a first opening, a second opening, a third opening and a fourth opening;

[0013] One end of the end pipe is sealed, and the other end of the end pipe is connected to the first port;

[0014] One end of the first connecting tube is connected to the second port, and the other end of the first connecting tube is connected to the pushing mechanism.

[0015] Furthermore, the third opening and the fourth opening are communicated with the chamber.

[0016] Furthermore, the shell also includes a three-way pipe and a sealing cover, the three-way pipe includes a fifth port, a sixth port and a seventh port, the fifth port is connected to the first connecting pipe, the sixth port is connected to the pushing mechanism, and the seventh port is connected to the sealing cover.

[0017] Furthermore, the shell also includes a second connecting tube, one end of which is connected to the sixth port, and the pushing mechanism includes a plunger, and the other end of the second connecting tube is slidably and sealingly connected to the plunger.

[0018] Furthermore, the pushing mechanism includes a hydraulic cylinder and a plunger, and the free end of the plunger is fixedly connected to the core shaft.

[0019] Furthermore, the pushing mechanism also includes a hydraulic station, which is connected to the hydraulic cylinder and is suitable for providing power to the hydraulic cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a cross-sectional schematic diagram of a temporary blocking body delivery device according to an embodiment of the present invention;

[0021] Figure 2 It is a bottom view schematic diagram of the temporary blocking body delivery device according to an embodiment of the present invention;

[0022] Figure 3 A schematic cross-sectional view of a mandrel according to an embodiment of the present invention;

[0023] Figure 4 A schematic top view of a mandrel according to an embodiment of the present invention;

[0024] Figure 5 A schematic cross-sectional view of a housing according to an embodiment of the present invention;

[0025] Figure 6 For the present invention Figure 5 The enlarged image at point I in the middle;

[0026] Figure 7 For the present invention Figure 5 Enlarged view of II in the middle;

[0027] Figure 8 Schematic diagram of the pushing mechanism described in an embodiment of the present invention.

[0028] Description of reference numerals:

[0029] 1-shell; 11-end pipe; 12-four-way pipe; 121-first port; 122-second port; 123-third port; 124-fourth port; 13-first connecting pipe; 14-three-way pipe; 141-fifth port; 142-sixth port; 143-seventh port; 15-sealing cover; 16-second connecting pipe; 17-cavity; 2-pushing mechanism; 21-hydraulic cylinder; 22-plunger; 23-hydraulic station; 3-spindle; 31-chamber. DETAILED DESCRIPTION

[0030] At present, in the fracturing operation of the oil extraction industry, it is necessary to put degradable temporary plugging bodies into the high-pressure fracturing pipeline, and put large-size temporary plugging bodies into the pipe sleeve to plug the perforation holes. After temporary plugging, the liquid is diverted to achieve layer-by-layer and step-by-step transformation, so that the liquid flows to the untransformed area and new fractures are formed by fracturing. Temporary plugging fracturing technology can increase the reservoir transformation system, which plays an important role in rapidly increasing the dynamic pressure of reservoir liquid and promoting the complexity of fractures.

[0031] In the prior art, temporary plugging bodies mostly adopt spherical structures (mostly called temporary plugging balls), or polyhedral spherical structures, which are easy to circulate in pipelines. However, for some knot-shaped temporary plugging bodies, beeswax is currently used to encapsulate the knot-like complex temporary plugging bodies into spherical structures. Although they can be placed one by one, the beeswax needs to be crushed during the process of being put into the fracturing process, otherwise it will affect the decomposition effect of the temporary plugging body. However, it is difficult to achieve 100% crushing of the beeswax when the above-mentioned temporary plugging bodies are placed. In addition, the pressure during the fracturing operation is an ultra-high pressure of about 140MPa, and manual placement cannot be achieved at this time. Therefore, it is necessary to improve the placement of complex knot-like temporary plugging bodies.

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0033] In the description of the present invention, it should be noted that the terminology nouns in the various embodiments, such as "upper", "lower", "front", "back" and other words indicating directions, are only for simplifying the description of the positional relationship based on the drawings in the specification, and do not mean that the components and devices referred to must be operated according to the specific directions and defined operations and methods and structures in the specification, and such directional nouns do not constitute limitations on the present invention. In the description of the present invention, "connection" includes both direct connection and indirect connection achieved through other components.

[0034] In addition, the terms "first" and "second" mentioned in the embodiments of the present invention are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0035] It should be understood that the positive direction of "X" in the drawings represents the right, and the orientation or positional relationship indicated by the term "X" is based on the orientation or positional relationship shown in the drawings of the specification, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0036] In the description of the implementation regulations of this application, the description of the term "some specific embodiments" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same implementation or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0037] This embodiment provides a temporary blocking body delivery device, combined with Figure 1 and Figure 2 As shown, it includes a shell 1, a pushing mechanism 2 and a core shaft 3. A cavity 17 is provided in the shell 1. The pushing mechanism 2 is suitable for driving the core shaft 3 to reciprocate in the cavity 17. Specifically, the core shaft 3 is a cylindrical long rod extending along the X-axis direction. The cavity 17 is a cylindrical inner hole matching the shape of the core shaft 3. The core shaft 3 is in close contact with the inner wall of the cavity 17.

[0038] The housing 1 is provided with a discharge port, which is communicated with the cavity 17, and the mandrel 3 is provided with a chamber 31, which is suitable for communicating with the discharge port when the mandrel 3 moves to a set position. Specifically, the pushing mechanism 2 pushes the mandrel 3 to reciprocate along the X-axis in the cavity 17, and when the chamber 31 of the mandrel 3 is communicated with the discharge port, the temporary plugging body in the chamber 31 can be discharged from the discharge port and enter the fracturing pipe, and finally reach the crack that needs to be temporarily plugged.

[0039] The temporary blocking body delivery device described in this embodiment realizes the mechanical discharge of the temporary blocking body. For temporary blocking bodies with complex shapes such as knotted ropes, discharge can be achieved without encapsulating them into a spherical structure with beeswax. The delivery device is simple and low in cost.

[0040] It should be noted that this embodiment only takes a linear reciprocating core shaft 3 and cavity 17 as an example, and does not limit the core shaft 3 of the present invention to only a linear structure, an arc or annular structure. Any structure that can achieve relative displacement and connect the chamber 31 with the discharge port at a suitable position falls within the protection scope of the temporary blocking body delivery device defined by the present invention.

[0041] Optionally, the core shaft 3 may be a triangular prism, a quadrangular prism or other irregular prism structures, and any structure that can enable the core shaft 3 to move back and forth in the cavity 17 falls within the protection scope of the present invention for the core shaft.

[0042] Combination Figure 3 and Figure 4 As shown, there are multiple chambers 31, and the multiple chambers 31 are linearly spaced and arranged, and the multiple chambers 31 are suitable for being connected with the discharge port in sequence when the core shaft 3 moves. When the temporary blocking body delivery device is working, the temporary blocking body is placed in each chamber 31. As the pushing mechanism 2 pushes the core shaft 3 in the opposite direction of the X-axis, the chamber 31 of the core shaft 3 gradually approaches the discharge port, and the multiple chambers 31 are connected with the discharge port in sequence, so that the multiple temporary blocking bodies are delivered in sequence. Preferably, by controlling the pushing distance and pushing time of the pushing mechanism 2, the interval time of the multiple chambers 31 communicating with the discharge port is controlled, so that the multiple temporary blocking bodies are discharged in sequence at intervals, and the interval time is controllable, and the delivery is more accurate.

[0043] Preferably, the chamber 31 penetrates the core shaft 3 in the radial direction of the core shaft 3 to prevent the temporary blocking body from being located in the chamber 31 and being sucked into the chamber 31 due to the pressure difference, thereby ensuring that the temporary blocking body can be detached from the chamber 31 and enter the discharge port.

[0044] Preferably, the chamber 31 is funnel-shaped, that is, the upper part of the chamber 31 is an inverted truncated cone-shaped slot, and the lower part of the chamber 31 is a cylindrical slot with a diameter smaller than that of the upper part. The temporary blocking body is blocked and stays in the upper part area to prevent the temporary blocking body from reaching the bottom of the chamber 31 due to gravity. The core shaft 3 will not squeeze the temporary blocking body when it reciprocates relative to the shell 1, thereby ensuring the structural integrity of the temporary blocking body and allowing the core shaft 3 to move smoothly in the cavity 17.

[0045] Combination Figures 5 to 7 As shown, the shell 1 includes an end tube 11, a cross-way tube 12 and a first connecting tube 13, and the cross-way tube 12 includes a first opening 121, a second opening 122, a third opening 123 and a fourth opening 124; one end of the end tube 11 is sealed, and the other end of the end tube 11 is connected to the first opening 121; one end of the first connecting tube 13 is connected to the second opening 122, and the other end of the first connecting tube 13 is connected to the pushing mechanism 2.

[0046] Specifically, the end tube 11 is a straight tube with one end closed and the other end open, and the opening of the end tube 11 is sealed and connected to the first opening 121 of the cross-way tube 12. The cross-way tube 12 is a cross-shaped cross-way tube, the first opening 121 is linearly connected to the second opening 122, the third opening 123 is linearly connected to the fourth opening 124, the second opening 122 is sealed and connected to one end of the first connecting tube 13 located in the opposite direction of the X-axis, and the end tube 11, the first opening 121, the second opening 122 and the first connecting tube 13 are linearly connected to form a part of the cavity 17. Specifically, the four-way pipe 12 can be connected to the fracturing fluid pipeline, and the third port 123 is suitable for connecting to the input end of the fracturing fluid pipeline, and the fracturing fluid in the fracturing fluid pipeline can enter the through channel formed by the third port 123 and the fourth port 124; the fourth port 124 is suitable for connecting to the output end of the fracturing fluid, and the fracturing fluid entering the through channel re-enters the rear end of the fracturing fluid pipeline through the fourth port 124, and enters the underground layer for fracturing work. At this time, the fourth port 124 is the discharge port.

[0047] In the temporary plugging body delivery device described in this embodiment, when the chamber 31 is connected to the fourth opening 124, the third opening 123 and the fourth opening 124 are connected to the chamber 31. Under the action of the high-pressure fracturing fluid in the fracturing fluid pipeline, the temporary plugging body in the chamber 31 can directly follow the high-pressure fracturing fluid into the crack for temporary plugging, and the delivery is smoother and more accurate, and can be delivered under high pressure conditions, which is safe and convenient.

[0048] Combination Figures 5 to 7As shown, the shell 1 also includes a three-way pipe 14 and a sealing cover 15. The three-way pipe 14 includes a fifth port 141, a sixth port 142 and a seventh port 143. The fifth port 141 is connected to the first connecting pipe 13, the sixth port 142 is connected to the pushing mechanism 2, and the seventh port 143 is connected to the sealing cover 15.

[0049] Specifically, the fifth opening 141 is linearly connected with the sixth opening 142, the fifth opening 141 is sealedly connected with one end of the first connecting tube 13 along the positive direction of the X-axis, and the sixth opening 142 is connected with the pushing mechanism 2 via the second connecting tube 16. The through passage between the fifth opening 141 and the sixth opening 142 is connected with the linear through passage formed by the end tube 11, the first opening 121, the second opening 122 and the first connecting tube 13, and together form the cavity 17.

[0050] Preferably, the seventh port 143 is sealed and connected to the sealing cover 15, and the seventh port 143 can be used as an input point for the temporary blocking body. By controlling the chamber 31 to communicate with the seventh port 143, the temporary blocking body can be input into the chamber 31 from the seventh port 143. On the other hand, the seventh port 143 also serves as an observation port to observe whether the structure of the core shaft 3 is intact.

[0051] Combination Figures 5 to 7 As shown, the housing 1 further includes a second connecting tube 16 , one end of which is connected to the sixth port 142 , and the pushing mechanism 2 includes a plunger 22 , the other end of which is slidably and sealingly connected to the plunger 22 .

[0052] Specifically, one end of the second connecting tube 16 along the negative direction of the X-axis is sealed and connected to the sixth port 142 of the three-way tube 14, and the sixth port 142 is sealed and slidably connected to the core shaft 3. One end of the second connecting tube 16 along the positive direction of the X-axis is sealed and slidably connected to the plunger 22 of the pushing mechanism 2. Through the sealed and slidably connected at the above two locations, the isolation effect between the cavity 17 and the pushing mechanism 2 is improved, preventing the high pressure environment in the cavity 17 from affecting the pushing mechanism 2.

[0053] Specifically, combined Figure 8 As shown, the pushing mechanism 2 includes a hydraulic cylinder 21 and a plunger 22. The free end of the plunger 22 is fixedly connected to the core shaft 3. The hydraulic cylinder 21 is suitable for driving the plunger 22 to reciprocate along the X-axis, and the plunger 22 drives the core shaft 3 to reciprocate.

[0054] Preferably, the pushing mechanism 2 further includes a hydraulic station 23 , wherein the hydraulic station 23 is connected to the hydraulic cylinder 21 , and the hydraulic station 23 is suitable for providing power to the hydraulic cylinder 21 .

[0055] It should be noted that the sealing connection described in this embodiment includes flange connection, threaded connection and bolt connection, and a sealing gasket is provided at the connection, which is specifically set according to the structural requirements. Specifically, in the temporary plugging body delivery device described in this embodiment, the end pipe 11 is threadedly connected to the four-way pipe 12, the four-way pipe 12 is threadedly connected to the first connecting pipe 13, the first connecting pipe 13 is threadedly connected to the three-way pipe 14, the three-way pipe 14 is threadedly connected to the sealing cover 15, the three-way pipe 14 is bolted to the second connecting pipe 16, and the second connecting pipe 16 is bolted to the pushing mechanism 2.

[0056] Specifically, the temporary blocking body delivery device described in this embodiment is also provided with auxiliary parts, including an equipment base (not visible in the figure), a cylinder seat (not numbered in the figure), a sealing flange (not numbered in the figure), a high-pressure manifold (not numbered in the figure), etc. to ensure the overall operation of the device.

[0057] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A temporary blocking body delivery device, characterized in that: It comprises a housing (1), a pushing mechanism (2) and a core shaft (3); a cavity (17) is provided in the housing (1); and the pushing mechanism (2) is suitable for driving the core shaft (3) to move back and forth in the cavity (17); The housing (1) is provided with a discharge port, the discharge port being communicated with the cavity (17); the mandrel (3) is provided with a chamber (31), and the chamber (31) is suitable for communicating with the discharge port when the mandrel (3) moves to a set position; There are a plurality of chambers (31), the plurality of chambers (31) are linearly spaced and arranged, the plurality of chambers (31) are suitable for being connected with the discharge port in sequence when the core shaft (3) moves, and the chamber (31) is funnel-shaped; The pushing mechanism (2) comprises a hydraulic cylinder (21) and a plunger (22), and the free end of the plunger (22) is fixedly connected to the core shaft (3).

2. The temporary blocking body delivery device according to claim 1, characterized in that: The chamber (31) penetrates the core shaft (3) along the radial direction of the core shaft (3).

3. The temporary blocking body delivery device according to claim 2, characterized in that: The shell (1) comprises an end pipe (11), a cross-way pipe (12) and a first connecting pipe (13); the cross-way pipe (12) comprises a first opening (121), a second opening (122), a third opening (123) and a fourth opening (124); One end of the end tube (11) is sealed, and the other end of the end tube (11) is connected to the first opening (121); One end of the first connecting tube (13) is connected to the second opening (122), and the other end of the first connecting tube (13) is connected to the pushing mechanism (2).

4. The temporary blocking body delivery device according to claim 3, characterized in that: The third opening (123) and the fourth opening (124) are in communication with the chamber (31).

5. The temporary blocking body delivery device according to claim 3, characterized in that: The housing (1) further comprises a three-way pipe (14) and a sealing cover (15); the three-way pipe (14) comprises a fifth opening (141), a sixth opening (142) and a seventh opening (143); the fifth opening (141) is connected to the first connecting pipe (13), the sixth opening (142) is connected to the pushing mechanism (2), and the seventh opening (143) is connected to the sealing cover (15).

6. The temporary blocking body delivery device according to claim 5, characterized in that: The housing (1) further comprises a second connecting tube (16), one end of which is connected to the sixth port (142); the pushing mechanism (2) comprises a plunger (22), the other end of which is connected to the plunger (22) in a sliding and sealing manner.

7. The temporary blocking body delivery device according to claim 1, characterized in that: The pushing mechanism (2) further comprises a hydraulic station (23), wherein the hydraulic station (23) is connected to the hydraulic cylinder (21), and the hydraulic station (23) is suitable for providing power to the hydraulic cylinder (21).

Images