Soluble arrow cluster tool

Abstract

The invention relates to a fracturing temporary plugging tool, in particular to a soluble arrow cluster tool which solves the problem that an existing fracturing temporary plugging tool is poor in temporary plugging effect, the soluble arrow cluster tool comprises an arrow cluster body and an empennage, the arrow cluster body is made of a metal material soluble in the presence of chloride ions, and the empennage is made of a rubber material soluble in the presence of chloride ions. The front section of the arrow cluster body is of a conical body structure; the sleeving part of the tail wing sleeves the mounting part of the tail section, and the top shape of the sleeving part is matched with the bottom shape of the front section; a limiting part is arranged at the large end of the mounting part and comprises two symmetrically-arranged tail bases, the bottom of the sleeving part abuts against the tops of the two tail bases, the limiting part is arranged at the bottom of the sleeving part, the limiting part is clamped in a clamping groove between the two tail bases, the sleeving part comprises four side walls, and the four side walls correspond to the four side walls of the front section respectively. The shape of each side wall of the sleeving part is matched with the shape of each of the four side walls of the front section, and a cone structure extending downwards is formed.

Description

Technical Field

[0001] The invention relates to a fracturing temporary plugging tool, in particular to a soluble arrow cluster tool. Background Art

[0002] With the successive development of tight gas, shale gas, tight oil, etc. by various oilfield operating units, when realizing large-displacement and large-volume fracturing of oil and gas wells, it is necessary to perform perforation operations at a specified depth of the formation first. After the perforation is completed, multiple blastholes will be formed on the casing at the depth, and then fracturing fluid will be introduced into the well to achieve formation fracturing. After a period of time of pumping fracturing fluid into the well through the pipeline, some blastholes produced by the perforation operation have been connected with the oil and gas in the formation, but some blastholes have not been connected. If the fracturing fluid continues to be introduced, some of the fracturing fluid will enter the formation along the blastholes that have been connected, resulting in a decrease in fracturing efficiency. Therefore, it is necessary to temporarily block these blastholes that have been connected, so that the fracturing fluid can act on the blastholes that have not been connected as much as possible to improve the fracturing efficiency.

[0003] At present, the commonly used temporary plugging tools are soluble balls and soluble knots, but both have their own limitations. When the soluble ball is lowered to the blasthole through a pipeline, due to its smooth surface, it is easy to bounce back and forth when it is bumped, resulting in an inability to accurately enter the blasthole for plugging, resulting in a poor temporary plugging effect. The soluble knot itself is made of flexible material with low pressure bearing capacity. The blasthole is generally located in the stratum at a depth of several thousand meters underground with high formation pressure. During the lowering process of the soluble knot, the formation pressure has a greater impact on it, resulting in a poor temporary plugging effect. Summary of the invention

[0004] The purpose of the present invention is to solve the technical problem that the existing temporary plugging tools for fracturing have poor temporary plugging effect, and to provide a soluble arrow cluster tool.

[0005] In order to achieve the above-mentioned invention object, the present invention provides the following technical solutions:

[0006] A soluble arrow tool, which is special in that it comprises an arrow body and a tail wing, wherein the arrow body is made of a metal material soluble in chloride ions, and the tail wing is made of a rubber material soluble in chloride ions;

[0007] The arrow cluster body includes a front section and a rear section;

[0008] The front section is a cone-shaped structure, which is rhombus-shaped in horizontal section, and the four sides are all curves protruding outwards, and the four corners are all arc transitions; the four edges of the front section are all curves protruding outwards, and the two corresponding edges at the cone tip are also arc transitions;

[0009] The tail section is connected to the bottom of the front section, and the tail section includes a mounting portion and a clamping portion; the mounting portion is a quadrangular pyramid structure, and its small end is connected to the bottom of the front section; or the mounting portion is a quadrangular column structure, and its upper end is connected to the bottom of the front section; the four edges of the mounting portion are arranged in one-to-one correspondence with the four edges of the front section;

[0010] The clamping part includes two tailstocks symmetrically arranged on both sides of the lower end of the mounting part, and a clamping slot is arranged between the two tailstocks;

[0011] The tail wing is a hollow structure, including a sleeve portion and a limiting portion, the sleeve portion is sleeved on the mounting portion, the top of the sleeve portion abuts against the bottom of the front section, and the shape of the top of the sleeve portion matches the shape of the bottom of the front section; the bottom of the sleeve portion abuts against the top surfaces of the two tail seats; the sleeve portion includes four side walls, which are respectively arranged corresponding to the four side walls of the front section, and the shape of each side wall of the sleeve portion matches the shape of the four side walls of the front section, and forms a cone structure extending downward;

[0012] The limiting portion is connected to the bottom of the sleeve portion, and the limiting portion is clamped in the clamping slot.

[0013] Furthermore, the chloride-ion-soluble metal material used to make the arrow body is a magnesium-aluminum alloy.

[0014] Furthermore, the front section and the rear section are integrally arranged.

[0015] Furthermore, the sleeve portion and the limiting portion are integrally arranged.

[0016] Furthermore, the two tailstocks are both quadrangular prism structures, which are rectangular or diamond-shaped in horizontal section, one edge of which is arranged corresponding to an edge of the mounting portion, and two side walls of the tailstock protrude from the two corresponding side walls of the mounting portion.

[0017] Furthermore, the top end surface of the tailstock is configured as two symmetrical inclined surfaces inclined downward and outward, and the height of the upper end of an edge corresponding to one edge of the mounting portion is higher than the heights of the remaining three edges.

[0018] Furthermore, the bottom of the limiting portion and the bottom of the tailstock are located in the same plane.

[0019] Furthermore, the four edges and corners of the tailstock on the horizontal section and the edges and corners of the upper and lower ends are all arc transitions.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] (1) The present invention provides a soluble arrow tool comprising an arrow body and a tail wing, wherein the arrow body is made of a metal material soluble in chloride ions, and the tail wing is made of a rubber material soluble in chloride ions, and the front section of the arrow body is a cone structure with guiding properties, and the sleeve portion of the tail wing is sleeved on the mounting portion of the tail section of the arrow body, the top of the sleeve portion abuts against the bottom of the front section of the arrow body, and the shape of the top of the sleeve portion is adapted to the shape of the bottom of the front section; in order to prevent the tail wing from falling out during the lowering process of the soluble arrow tool, a clamping portion is provided at the lower end of the mounting portion, and the clamping portion includes two symmetrically arranged tail seats, the bottom of the sleeve portion abuts against the top ends of the two tail seats, and in order to prevent the tail wing from falling out The wing rotates, and a limiting part is also provided at the bottom of the sleeve part of the tail wing, which is clamped in the slot between the two tail seats. In order to ensure the overall streamlined shape of the entire soluble arrow cluster tool, the sleeve part includes four side walls, which are respectively arranged corresponding to the four side walls of the front section. The shape of each side wall of the sleeve part is respectively adapted to the shape of the four side walls of the front section, and constitutes a cone structure extending downward; in this way, the arrow cluster body serves as a skeleton with high rigidity, which provides support for the tail wing and can withstand the pressure in the well. The tail wing is made of rubber material that is soluble in chloride ions, which can provide elastic deformation when sealing the blast hole. The combination of soft and hard solves the problem of poor temporary plugging effect of existing temporary plugging tools.

[0022] (2) In a soluble arrow cluster tool provided by the present invention, the front section and the rear section are integrally arranged, and the sleeve section and the limiting section are integrally arranged. When the arrow cluster body or the tail wing is manufactured, they can be integrally formed by a mold, thereby saving manufacturing costs.

[0023] (3) In a soluble arrow cluster tool provided by the present invention, the arrow cluster body is made of a metal material that is soluble in chloride ions, and the tail wing is made of a rubber material that is soluble in chloride ions. The arrow cluster body is made of a magnesium-aluminum alloy material, so that the structural strength is higher and can withstand the high pressure in the well. After the fracturing is completed, the entire soluble arrow cluster tool will melt by itself by adding a substance containing chloride ions, and there is no need for recovery, thus saving mining costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional structural schematic diagram of an embodiment of a soluble arrow cluster tool of the present invention;

[0025] Figure 2 It is a schematic diagram of the three-dimensional structure of the arrow cluster body in an embodiment of the present invention.

[0026] The following are the descriptions of the reference numerals:

[0027] 1-arrow body, 11-front section, 12-tail section, 121-installation part, 122-tail seat; 2-tail wing, 21-sleeve part, 22-limiting part. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0029] Reference Figure 1-Figure 2 The soluble arrow tool of the present invention comprises an arrow body 1 and a tail wing 2. In order to save the recovery step after the fracturing is completed, the arrow body 1 is made of a magnesium-aluminum alloy material that is soluble in chloride ions, which has strong rigidity and can withstand high pressure in the well. The tail wing 2 is used to seal the blasthole and needs to be made of an elastic material, so it is made of a rubber material that is soluble in chloride ions. When the fracturing process is completed, magnesium chloride or potassium chloride and other chloride-containing substances are transported through the pipeline, and the entire soluble arrow tool will dissolve by itself, which will not hinder the next step.

[0030] The structure of the arrow body 1 is as follows Figure 2 As shown, it includes a front section 11 and a tail section 12. The front section 11 is a cone structure, which is rhombus-shaped in horizontal section, and the four sides are all curves convex outwards, and the four corners are all arc transitions; the four edges of the front section 11 are all curves convex outwards, and there is also an arc transition between the two corresponding edges at the tip of the cone. Such a front section 11 structure is more aerodynamic, has a certain guiding property, and can enable the entire tool to be transported from the pipeline to the blasthole position faster and better.

[0031] The tail section 12 is used to install the tail wing 2, and includes a mounting portion 121 and a clamping portion. The mounting portion 121 can be a quadrangular pyramid structure or a quadrangular column structure. Figure 2 In the case of the tetrahedral pyramid structure shown in the figure, its small end is connected to the bottom of the front section 11, and in the case of the tetrahedral column structure, its upper end is connected to the bottom of the front section 11. Regardless of whether the mounting portion 121 is a tetrahedral pyramid structure or a tetrahedral column structure in this embodiment, its four edges are arranged in one-to-one correspondence with the four edges of the front section 11.

[0032] The clamping portion includes tail seats 122 symmetrically arranged on both sides of the lower end of the mounting portion 121, and a clamping groove is arranged between the two tail seats 122. In order to install the tail wing 2 on the arrow cluster body 1, the tail wing 2 is a hollow structure, including a sleeve portion 21 and a limiting portion 22. The sleeve portion 21 is directly sleeved on the mounting portion 121, and the top of the sleeve portion 21 abuts against the bottom of the front section 11 of the arrow cluster body 1, and the top shape of the sleeve portion 21 is adapted to the bottom shape of the front section 11, and the bottom of the sleeve portion 21 abuts against the two tail seats 1. The top of the sleeve part 22 abuts against the front section 11 and the tail seat 122, so that the sleeve part 21 is fixed by relying on the front section 11 and the tail seat 122. In order to prevent the sleeve part 21 from rotating, a limiting part 22 is provided at the bottom of the sleeve part 21. The limiting part 22 is clamped in the groove between the two tail seats 122, and the bottom of the limiting part 22 and the bottom of the tail seat 122 are located in the same plane. In this way, the structure of the entire tool is compact, and after the tail wing 2 is sleeved on the arrow cluster body 1, there is no redundant protruding part, which prevents it from being hooked with other objects in the well during the lowering process.

[0033] In order to make the overall shape of the soluble arrow tool more aerodynamic, such as Figure 1 As shown, the sleeve portion 21 includes four side walls, which are respectively arranged corresponding to the four side walls of the front section 11. The shape of each side wall of the sleeve portion 21 is respectively adapted to the shape of the four side walls of the front section 11, and forms a cone structure extending downward.

[0034] The two tailstocks 122 are both quadrangular prism structures, which are rectangular or rhombus-shaped in horizontal section, one of which is arranged corresponding to an edge of the mounting portion 121, and the two side walls of the tailstock 122 are protruding from the two corresponding side walls of the mounting portion 121, and the top surface of the tailstock 122 is two symmetrical inclined surfaces inclined downward and outward, and the upper end height of the edge arranged corresponding to an edge of the mounting portion 121 is higher than the heights of the other three edges. In order to ensure that the overall structure is more aerodynamic, the four edges and corners of the tailstock 122 in the horizontal section and the edges and corners of the upper and lower ends are all arc transitions.

[0035] For the convenience of manufacturing, the front section 11 and the rear section 12 are integrally arranged, and the sleeve portion 21 and the limiting portion 22 are integrally arranged, so that the mold can be used for one-time molding, which saves manufacturing costs and facilitates mass production.

[0036] When in use, first prepare the corresponding soluble arrow cluster tool according to the number of blastholes to be blocked, then put the soluble arrow cluster tool into the fracturing pipeline, pump the fracturing fluid into the fracturing pipeline through the fracturing vehicle, and the fracturing fluid will send the soluble arrow cluster tool to the corresponding blasthole position, and then the soluble arrow cluster tool enters the blasthole, and the tail 2 is squeezed with the inner wall of the blasthole to elastically deform, and the soluble arrow cluster tool is fixed in the blasthole. The blasthole that has been penetrated is temporarily blocked by the soluble arrow cluster tool, which can also alleviate the erosion of the fracturing fluid to a certain extent. After the temporary blocking is completed, the fracturing fluid can be used as much as possible on the blasthole that has not been penetrated, thereby improving the efficiency of the fracturing operation. When the fracturing is completed, magnesium chloride or calcium chloride is added through the fracturing pipeline, and the soluble arrow cluster tool will dissolve by itself without the need for recycling, further saving mining costs.

[0037] The embodiments described above are merely descriptions of specific implementation methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A soluble arrow tool, characterized in that: It comprises an arrow cluster body (1) and a tail wing (2), wherein the arrow cluster body (1) is made of a metal material that is soluble in chloride ions, and the tail wing (2) is made of a rubber material that is soluble in chloride ions; The arrow cluster body (1) comprises a front section (11) and a rear section (12); The front section (11) is a cone-shaped structure, which is rhombus-shaped in horizontal section, and the four sides are all curves protruding outwards, and the four corners are all arc transitions; the four edges of the front section (11) are all curves protruding outwards, and the two edges corresponding to each other at the cone tip are also arc transitions; The tail section (12) is connected to the bottom of the front section (11), and the tail section (12) comprises a mounting portion (121) and a clamping portion; the mounting portion (121) is a quadrangular pyramid structure, and its small end is connected to the bottom of the front section (11); or the mounting portion (121) is a quadrangular column structure, and its upper end is connected to the bottom of the front section (11); the four edges of the mounting portion (121) are arranged in one-to-one correspondence with the four edges of the front section (11); The clamping portion comprises two tailstocks (122) symmetrically arranged on both sides of the lower end of the mounting portion (121), and a clamping groove is arranged between the two tailstocks (122); The tail wing (2) is a hollow structure, comprising a sleeve portion (21) and a limiting portion (22); the sleeve portion (21) is sleeved on the mounting portion (121); the top of the sleeve portion (21) abuts against the bottom of the front section (11), and the shape of the top of the sleeve portion (21) matches the shape of the bottom of the front section (11); the bottom of the sleeve portion (21) abuts against the top end surfaces of the two tail seats (122); the sleeve portion (21) comprises four side walls, which are respectively arranged corresponding to the four side walls of the front section (11); the shape of each side wall of the sleeve portion (21) matches the shape of the four side walls of the front section (11), and forms a cone structure extending downward; The limiting portion (22) is connected to the bottom of the sleeve portion (21), and the limiting portion (22) is clamped in the clamping groove.

2. The soluble arrow tool according to claim 1, characterized in that: The chloride ion-soluble metal material used to make the arrowhead body (1) is a magnesium-aluminum alloy.

3. The soluble arrow tool according to claim 2, characterized in that: The front section (11) and the rear section (12) are integrally arranged.

4. The soluble arrow tool according to claim 3, characterized in that: The sleeve portion (21) and the limiting portion (22) are integrally arranged.

5. The soluble arrow tool according to claim 4, characterized in that: The two tailstocks (122) are both quadrangular prism structures, which are rectangular or rhombus-shaped in horizontal cross-section, one of whose edges is arranged corresponding to an edge of the mounting portion (121), and the two side walls of the tailstock (122) are both protruding from the two corresponding side walls of the mounting portion (121).

6. The soluble arrow tool according to claim 5, characterized in that: The top end surface of the tailstock (122) is arranged as two symmetrical inclined surfaces inclined downward and outward, and the height of the upper end of an edge arranged corresponding to an edge of the mounting portion (121) is higher than the heights of the other three edges.

7. The soluble arrow tool according to claim 1, characterized in that: The bottom of the limiting portion (22) and the bottom of the tailstock (122) are located in the same plane.

8. The soluble arrow tool according to claim 6, characterized in that: The four corners of the tailstock (122) on the horizontal section and the corners of the upper and lower ends are all arc transitions.

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