A tool and method for determining leak patterns

Abstract

The present application relates to the technical field of unconventional oil and gas reservoir exploitation, and particularly relates to a tool and method for determining a leakage point form, aiming to solve the problems of large operation workload and damage to the form of tools such as packers on the pipe column in the process of lifting the pipe column, which affect the judgment of the leakage point, in the prior art when the casing pressure rises. When the casing pressure abnormally rises in the process of operation and the form of the leakage point needs to be determined, firstly, the first ball is thrown, and the casing pressure rises in the process of pressure, which indicates that the tubing has a leakage point. If the pressure can be stabilized, it indicates that there is no leakage point on the tubing. At this time, the second ball is thrown, and the pressure acts on the outer sleeve through the pressure transmission hole, and then the rubber cylinder piece is released. At this time, the rubber cylinder piece and the packer rubber cylinder form a sealed space, and the pressure is pressed in the sealed space. If the pressure cannot be stabilized, it indicates that the packer sealing fails, and if the pressure can be stabilized, it indicates that the packer sealing is good, and the leakage point is caused by casing channeling.

Description

Technical Field

[0001] The present invention relates to the technical field of exploitation of unconventional oil and gas reservoirs such as petroleum and natural gas, and in particular to a tool and method for determining leakage points and forms. Background Art

[0002] When oil and gas wells are undergoing fracturing and acidizing operations using packers, abnormal increases in casing pressure may occur. This abnormal increase in casing pressure will render construction impossible, and it is necessary to identify the cause of this abnormal increase and rectify it to complete the well construction. There are many reasons for this increase in casing pressure, such as leaks in the tubing, packer seal failure, and casing channeling. To address these issues, the current conventional approach is to pull out the construction string for inspection. This not only involves a large amount of work, but also can damage the packers and other tools on the string during the string pulling process, impacting the identification of leaks. Summary of the Invention

[0003] The purpose of the present invention is to provide a tool and method for determining the form of leakage points, so as to solve the problems in the prior art of using the method of pulling out the construction pipe string to check one by one when the casing pressure rises, such as the large amount of construction work and the possible damage to the form of tools such as the packer on the pipe string during the pulling process, which affects the judgment of the leakage point.

[0004] In order to solve the above technical problems, the technical solution provided by the present invention is:

[0005] In a first aspect, the present invention provides a tool for determining the type of leak, comprising: an upper connector, a body, a rubber cartridge assembly, an outer sleeve, a first-stage ball, and a second-stage ball;

[0006] The upper joint is connected to the upper part of the body, the upper part of the upper joint is connected to the oil pipe, and the lower part of the body is provided with a packer;

[0007] The rubber cylinder assembly is provided with a rubber cylinder component, which is arranged below the upper joint and sleeved on one end of the body close to the upper joint. The rubber cylinder component has a tendency to move in a direction away from the body;

[0008] The outer sleeve is arranged below the rubber cylinder assembly, and the outer sleeve is sleeved on the outside of the body and connected to the body by shear nails. The top of the outer sleeve is provided with a step structure, and the end of the rubber cylinder away from the upper joint is clamped on the step structure, and the step structure is used to restrain the rubber cylinder;

[0009] The body is provided with a pressure transmission hole, the pressure transmission hole is arranged downstream of the rubber cylinder, and the body is provided with a first ball seat and a second ball seat;

[0010] The second ball seat is arranged downstream of the pressure transmission hole, and is used to clamp the second-stage ball. When the second-stage ball is clamped in the second ball seat, after the oil pipe is pressurized by liquid, the pressure acts on the outer sleeve through the pressure transmission hole. When the pressure reaches the shearing force of the shear pin, the shear pin is cut, the outer sleeve moves downward, and the rubber sleeve abuts against the inner wall of the casing after losing the constraint of the step structure.

[0011] The first ball seat is arranged downstream of the second ball seat, and the first ball seat is used to clamp the first-level ball.

[0012] Furthermore, the inner diameter of the first ball seat is smaller than the inner diameter of the second ball seat.

[0013] Furthermore, the main body has a boss extending inwardly, and the boss is arranged below the outer sleeve, and the boss is used to receive the outer sleeve after it descends.

[0014] Furthermore, the rubber cartridge assembly further includes a rubber cartridge housing;

[0015] The rubber cylinder shell is connected to the bottom of the upper joint and is connected to the upper part of the rubber cylinder component.

[0016] Furthermore, the rubber cylinder is configured as a leather cup structure.

[0017] Furthermore, an extension tube extends upward from the top of the main body, and the extension tube is inserted into the lower part of the upper joint.

[0018] Furthermore, a sealing ring is provided between the extension tube and the body.

[0019] Furthermore, the material of the first-level ball is a quickly soluble material.

[0020] Furthermore, the material of the second-level ball is a quickly soluble material.

[0021] In a second aspect, the present invention provides a method for determining the form of a leak based on the tool for determining the form of a leak, comprising the following steps:

[0022] Step 1: If the casing pressure rises abnormally during construction and the leak point needs to be determined, first drop the ball for the first time. When the first-stage ball lands on the first seat, pressurize the casing. If the casing pressure rises during the pressurization process, it indicates that there is a leak in the oil pipe.

[0023] Step 2: If the pressure can be stabilized, it means there is no leak on the oil pipe. At this time, the second ball is thrown. When the second-stage ball falls on the second ball seat, the rubber sleeve and the packer rubber sleeve form a sealed space. If the pressure cannot be stabilized in the sealed space, it means that the packer seal has failed. If the pressure can be stabilized, it means that the packer seal is good and the leak is caused by sleeve leakage.

[0024] Based on the above technical solutions, the technical effects achieved by the present invention are:

[0025] The tool for determining the form of the leak point is lowered into the well together with the packer and other tools, and then lowered into the casing. The packer is first set. After the packer is set, fracturing, acidizing and other operations are carried out according to the construction requirements. During the construction process, if the casing pressure rises abnormally and it is necessary to determine the form of the leak point, the first ball is dropped. When the first-stage ball falls on the first ball seat, pressure is applied. The rise in casing pressure during pressure application indicates that there is a leak point on the tubing. If the pressure can be stabilized, it means that there is no leak point on the tubing. At this time, the second ball is dropped. When the second ball falls on the second-stage ball seat, pressure is applied. The pressure acts on the outer casing through the pressure transmission hole, thereby releasing the rubber sleeve. At this time, the rubber sleeve and the seal are The isolator rubber cylinder forms a sealed space. If the pressure cannot be stabilized when the sealed space is pressurized, it means that the seal of the packer has failed. If the pressure can be stabilized, it means that the seal of the packer is good. The leakage point is caused by the casing leakage. In this way, the leakage point form can be eliminated one by one and finally the leakage point form is found. The present invention can determine the leakage point form without lifting the tubing, effectively reducing the workload of finding the leakage point form in the later stage while accelerating the efficiency of rectifying the leakage point. It solves the problem of large construction workload in the prior art of lifting the construction tubing for one-by-one inspection when the casing pressure rises, and the problem that the shape of tools such as the packer on the tubing may be damaged during the tubing lifting process, which affects the judgment of the leakage point. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 To determine the leakage point and form of tools and measures to transform the tools into the well string diagram;

[0028] Figure 2 A schematic diagram of the structure of a tool for determining the type of leak provided by an embodiment of the present invention;

[0029] Figure 3 Schematic diagram of a tool for determining the form of a leak for a first-stage ball drop;

[0030] Figure 4 Schematic diagram of the rubber cartridge being activated after the second-stage ball falls into the tool for determining the leak point form.

[0031] Icons: 31-upper connector; 32-body; 32a-pressure transmission hole; 32b-first ball seat; 32c-second ball seat; 32d-boss; 32e-extension tube; 33-rubber cylinder assembly; 33a-rubber cylinder component; 33b-rubber cylinder shell; 34-jacket; 34a-step structure; 34b-cavity; 35-first stage ball; 36-second stage ball; 37-shear pin; 38-sealing ring;

[0032] 1-Safety joint; 2-Hydraulic anchor; 3-Tool for determining the leak point; 4-Packer; 5-Tubing; 6-Sliding sleeve; 7-Casing; 8-Cement ring; 9-Setting ball seat. DETAILED DESCRIPTION

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0035] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0036] The present invention provides a tool for determining the form of leakage points, comprising: an upper joint 31, a body 32, a rubber cylinder assembly 33, an outer sleeve 34, a first-stage ball 35 and a second-stage ball 36; the upper joint 31 is connected to the upper part of the body 32, the upper part of the upper joint 31 is connected to the oil pipe 5, and the lower part of the body 32 is provided with a packer 4; the rubber cylinder assembly 33 is provided with a rubber cylinder part 33a, the rubber cylinder part 33a is provided below the upper joint 31, and is sleeved on one end of the body 32 close to the upper joint 31, and the rubber cylinder part 33a has a tendency to move in a direction away from the body 32; the outer sleeve 34 is provided below the rubber cylinder assembly 33, the outer sleeve 34 is sleeved on the outside of the body 32, and is connected to the body 32 by shear nails 37, the top of the outer sleeve 34 is provided with a step structure 34a, and the end of the rubber cylinder part 33a away from the upper joint 31 is clamped on the platform The stepped structure 34a is used to restrain the rubber cylinder part 33a; the main body 32 is provided with a pressure transmission hole 32a, which is arranged downstream of the rubber cylinder part 33a, and the main body 32 is provided with a first ball seat 32b and a second ball seat 32c; the second ball seat 32c is arranged downstream of the pressure transmission hole 32a, and the second ball seat 32c is used to clamp the second-stage ball 36, and the second-stage ball 36 is clamped in the second ball seat 32c. After the liquid is injected into the oil pipe 5 and pressurized, the pressure acts on the outer sleeve 34 through the pressure transmission hole 32a. When the pressure reaches the shear force of the shear pin 37, the shear pin 37 is cut, and the outer sleeve 34 moves downward. After the rubber cylinder part 33a loses the constraint of the stepped structure 34a, it abuts against the inner wall of the sleeve 7; the first ball seat 32b is arranged downstream of the second ball seat 32c, and the first ball seat 32b is used to clamp the first-stage ball 35.

[0037] The tool for determining the form of the leak point is lowered into the well together with the packer 4 and other tools, and then lowered into the casing 7. The packer 4 is first set. After the packer 4 is set, fracturing, acidizing and other operations are carried out according to the construction requirements. During the construction process, if the casing pressure rises abnormally and it is necessary to determine the form of the leak point, the first ball is dropped. When the first-level ball 35 falls on the first ball seat 32b, pressure is applied. The rise in casing pressure during pressure application indicates that there is a leak point on the oil pipe 5. If the pressure can be stabilized, it indicates that there is no leak point on the oil pipe 5. At this time, the second ball is dropped. When the second ball falls on the second-level ball seat 36, pressure is applied. The pressure acts on the outer sleeve 34 through the pressure transmission hole 32a, and then the rubber cylinder part 33a is released. At this time, the rubber tube part 33a and the rubber tube of the packer 4 form a sealed space. If the pressure cannot be stabilized when the sealed space is pressurized, it means that the seal of the packer 4 has failed. If the pressure can be stabilized, it means that the seal of the packer 4 is good and the leakage point is caused by the casing leakage. In this way, the leakage point form can be eliminated one by one and the leakage point form is finally found. The present invention can determine the leakage point form without lifting the tubing, effectively reducing the workload of finding the leakage point form in the later stage while accelerating the efficiency of rectifying the leakage point, solving the problem in the prior art of using the method of lifting the construction tubing for one-by-one inspection when the casing pressure rises, which has the problems of large construction workload and possible damage to the shape of tools such as the packer 4 on the tubing during the tubing lifting process, thereby affecting the judgment of the leakage point.

[0038] The following combination Figure 1-Figure 4 The structure and shape of the tool for determining the leakage point form provided in this embodiment are described in detail.

[0039] Regarding the shape and structure of the upper connector 31 and the body 32, in detail:

[0040] like Figure 2 As shown, the upper joint 31 is connected to the upper portion of the body 32. Both the upper joint 31 and the body 32 are cylindrical structures. The upper portion of the upper joint 31 is connected to the oil pipe 5, and the upper joint 31 is threadedly connected to the oil pipe 5. The lower portion of the body 32 is connected to the packer 4. Specifically, an extension tube 32e extends upward from the top of the body 32. The extension tube 32e is inserted into the lower portion of the upper joint 31 and is threadedly connected to the upper joint 31. A sealing ring 38 is provided between the extension tube 32e and the body 32.

[0041] A pressure transmission hole 32a is provided on the main body 32, and a first ball seat 32b and a second ball seat 32c are provided in the main body 32. The second ball seat 32c is provided downstream of the pressure transmission hole 32a, and the second ball seat 32c is a seat structure extending inward from the inner wall of the main body 32. The diameter of the second-level ball 36 is larger than the inner diameter of the second ball seat 32c, and the second ball seat 32c is used to clamp and limit the second-level ball 36; the first ball seat 32b is provided downstream of the second ball seat 32c, and the first ball seat 32b is a seat structure extending inward from the inner wall of the main body 32. The diameter of the first-level ball 35 is larger than the inner diameter of the first ball seat 32b, and the first ball seat 32b is used to clamp and limit the first-level ball 35; wherein, the inner diameter of the first ball seat 32b is smaller than the inner diameter of the second ball seat 32c.

[0042] Regarding the shape and structure of the rubber cartridge assembly 33, in detail:

[0043] like Figure 2 As shown, the rubber cartridge assembly 33 includes a rubber cartridge member 33a and a rubber cartridge housing 33b. The rubber cartridge housing 33b is connected to the bottom of the upper joint 31, connected to the body 32, and connected to the upper portion of the rubber cartridge member 33a. The end of the rubber cartridge member 33a connected to the rubber cartridge housing 33b is sleeved onto the body 32. The pressure transmission hole 32a is located downstream of the rubber cartridge member 33a, and the rubber cartridge member 33a has a tendency to move away from the body 32. Specifically, the rubber cartridge member 33a is vulcanized onto the rubber cartridge housing 33b, which can be understood as being adhered to the rubber cartridge housing 33b. The rubber cartridge member 33a has a leather cup structure, with the small end of the rubber cartridge member 33a facing upward and fixed to the rubber cartridge housing 33b, and the large end of the rubber cartridge member 33a facing downward. To restrict the large end of the cup, a jacket 34 is provided in this embodiment.

[0044] Regarding the shape and structure of the outer cover 34, in detail:

[0045] The outer sleeve 34 is arranged below the rubber cylinder assembly 33. The outer sleeve 34 is sleeved on the outside of the main body 32 and is connected to the main body 32 through shear nails 37. A step structure 34a is provided on the top of the outer sleeve 34. The large end of the bowl mouth of the rubber cylinder part 33a is clamped on the step structure 34a. The step structure 34a is used to restrain the rubber cylinder part 33a so that the large end of the bowl mouth of the rubber cylinder part 33a is in a tightened state.

[0046] Specifically, the outer sleeve 34 is sleeved on the outside of the main body 32, and there is an annular cavity 34b between the outer sleeve 34 and the main body 32. The second-stage ball 36 is clamped in the second ball seat 32c. After the liquid is injected into the oil pipe 5 and pressurized, the pressure enters the cavity 34b through the pressure transmission hole 32a and acts on the outer sleeve 34. When the pressure reaches the shear force of the shear pin 37, the shear pin 37 is sheared, and the outer sleeve 34 moves downward. The rubber cylinder part 33a loses the constraint of the step structure 34a and is tightly abutted against the inner wall of the casing 7; during the process of going down into the well, the outer sleeve 34 is used to limit the opening of the bowl mouth. When the outer sleeve 34 moves downward, the large end of the bowl mouth loses the restriction and returns to its original state.

[0047] In an optional embodiment, the body 32 has a boss 32d extending inwardly. The boss 32d is arranged below the outer sleeve 34. The outer sleeve 34 finally falls on the boss 32d when it descends. The boss 32d is used to receive the outer sleeve 34 after it descends and to serve as a limit.

[0048] The method for determining the leakage point type based on the tool for determining the leakage point type provided in this embodiment includes the following steps:

[0049] Reference Figure 1 ,by Figure 1 The upper and lower positions in the figure are taken as the standard. The connection order of the tools on the oil pipe 5 is from top to bottom as follows: safety joint 1, hydraulic anchor 2, tool for determining the leak point 3, packer 4, sleeve 6, and ball seat 9. The tool for determining the leak point 3 is lowered into the well together with the safety joint 1, hydraulic anchor 2, packer 4, sleeve 6, and ball seat 9. When the tool reaches the designed position, the ball is dropped to seal the packer 4. After the packer 4 is sealed, the sleeve 6 is opened to prepare for construction. During the construction process, if the casing pressure (i.e., the pressure between the oil pipe 5 and the casing 7) rises abnormally, it indicates that there is a leak in the oil pipe 5, the seal of the packer 4 fails, or the casing 7 is leaking. At this time, the leak point can be found by using the tool for determining the leak point. First, the first-level ball 35 that matches the tool is dropped. The first-level soluble ball is made of a fast-dissolving material. The first-level ball 35 enters the body 32 through the oil pipe 5. When the first-level ball 35 falls on the first ball seat 32b that matches it, the oil pipe 5 is pressurized. Figure 3As shown, when the pressure rises to the set pressure, a pressure drop test is performed. If there is a pressure drop and the casing pressure increases, it indicates that there is a leak on the oil pipe 5. If there is no pressure drop, it indicates that there is no leak on the oil pipe 5 above the tool 3 for determining the leak point. If there is no leak on the oil pipe 5, when the first-stage ball 35 made of a quickly soluble material dissolves to an outer diameter smaller than the inner diameter of the first ball seat 32b, the first-stage ball 35 falls to the bottom of the well, and the second-stage ball 36 is started to be cast. The second-stage ball 36 is made of a quickly soluble material. When the second-stage ball 36 falls on the second ball seat 32c that matches it in the tool, as shown in FIG. Figure 4 As shown, the pressure is continued to act on the outer sleeve 34 through the pressure transmission hole 32a. When the pressure reaches the shear force of the shear nail 37, the shear nail 37 is cut and the outer sleeve 34 moves downward. During the downward process of the outer sleeve 34, the rubber cylinder part 33a on the rubber cylinder assembly 33 loses its constraint and fits with the casing 7. At this time, the rubber cylinder part 33a and the rubber cylinder on the packer 4 form a sealed space, and the pressure is transmitted to this sealed space through the pressure transmission hole 32a. When the pressure reaches the set pressure, if there is a pressure drop, it means that there is a problem with the sealing of the packer 4, resulting in a leak. If there is no pressure drop, it means that the seal of the packer 4 is good. It can be judged that there is a leak caused by the channeling between the casing 7 and the cement ring 8. Through this method, the leakage type can be checked one by one and finally the leakage type can be found.

[0050] It should be noted that, since the packer 4 plays the role of protecting the casing 7 and isolating the reservoir during on-site construction, the sliding sleeve 6 below the packer 4 has been opened, and there is a liquid passage. The oil pipe 5 below the packer 4 is connected to the casing 7, and there is no need to consider the leakage point problem of the oil pipe 5 below the packer 4.

[0051] In this embodiment, a tool for determining the type of leak point is lowered together with the construction string. When an abnormal increase in casing pressure occurs during construction using a packer 4 in an oil and gas well, the tool is activated by dropping a ball to determine the type of leak point without lifting the string. Compared with the prior art, this embodiment has the following advantages:

[0052] 1. By putting the leak point determination tool and the measure modification tool into the well together, normal construction will not be affected.

[0053] 2. When the casing pressure rises abnormally during construction, the leakage point can be determined by throwing the ball without lifting the pipe string, which is highly operational.

[0054] 3. No need to run a separate leak detection string, which effectively reduces the workload of finding leak points in the later stage and speeds up the efficiency of leak rectification.

[0055] 4. Direct leak detection on the construction string effectively avoids the well control risks and formation pollution problems that occur when running a separate leak detection string.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A tool for determining the type of leak, characterized in that: include: Upper joint (31), body (32), rubber cylinder assembly (33), outer cover (34), first-stage ball (35) and second-stage ball (36); The upper joint (31) is connected to the upper part of the body (32), the upper part of the upper joint (31) is connected to the oil pipe (5), and the lower part of the body (32) is provided with a packer (4); The rubber cylinder assembly (33) is provided with a rubber cylinder component (33a), the rubber cylinder component (33a) is arranged below the upper joint (31), and is sleeved on one end of the body (32) close to the upper joint (31), and the rubber cylinder component (33a) has a tendency to move in a direction away from the body (32); The outer sleeve (34) is arranged below the rubber cylinder assembly (33), the outer sleeve (34) is sleeved on the outside of the body (32), and is connected to the body (32) through shear nails (37), the top of the outer sleeve (34) is provided with a step structure (34a), and one end of the rubber cylinder part (33a) away from the upper joint (31) is clamped on the step structure (34a), and the step structure (34a) is used to restrain the rubber cylinder part (33a); The body (32) is provided with a pressure transmission hole (32a), and the pressure transmission hole (32a) is arranged downstream of the rubber cylinder (33a). The body (32) is provided with a first ball seat (32b) and a second ball seat (32c); The second ball seat (32c) is arranged downstream of the pressure transmission hole (32a), and the second ball seat (32c) is used to clamp the second-stage ball (36). The second-stage ball (36) is clamped in the second ball seat (32c). After the oil pipe (5) is pressurized by liquid, the pressure acts on the outer sleeve (34) through the pressure transmission hole (32a). When the pressure reaches the shearing force of the shear pin (37), the shear pin (37) is cut, and the outer sleeve (34) moves downward. After the rubber cylinder (33a) loses the constraint of the step structure (34a), it contacts the inner wall of the sleeve (7); The first ball seat (32b) is arranged downstream of the second ball seat (32c), and the first ball seat (32b) is used for clamping the first-stage ball (35).

2. The tool for determining the leakage point form according to claim 1, characterized in that: The inner diameter of the first ball seat (32b) is smaller than the inner diameter of the second ball seat (32c).

3. The tool for determining the leakage point form according to claim 1, characterized in that: The main body (32) has a boss (32d) extending inward, and the boss (32d) is arranged below the outer sleeve (34). The boss (32d) is used to receive the outer sleeve (34) after it has descended.

4. The tool for determining the leakage point form according to claim 1, characterized in that: The rubber cartridge assembly (33) further includes a rubber cartridge housing (33b); The rubber cylinder shell (33b) is connected to the bottom of the upper joint (31) and is connected to the upper part of the rubber cylinder member (33a).

5. The tool for determining the leakage point form according to claim 1, characterized in that: The rubber cylinder part (33a) is configured as a leather cup structure.

6. The tool for determining the leakage point form according to claim 1, characterized in that: An extension tube (32e) extends upward from the top of the body (32), and the extension tube (32e) is inserted into the lower part of the upper joint (31).

7. The tool for determining the leakage point form according to claim 6, characterized in that: A sealing ring (38) is provided between the extension tube (32e) and the body (32).

8. The tool for determining the leakage point form according to claim 1, characterized in that: The material of the first-stage ball (35) is a fast-dissolving material.

9. The tool for determining the leakage point form according to claim 1, characterized in that: The material of the second-stage ball (36) is a fast-dissolving material.

10. A method for determining a leak point form based on the tool for determining a leak point form according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: When the casing pressure rises abnormally during the construction process and the leakage point needs to be determined, the first ball is thrown. When the first-level ball (35) falls on the first ball seat (32b), pressure is applied. The rise in casing pressure during the pressure application indicates that there is a leakage point in the oil pipe (5); Step 2: If the pressure can be stabilized, it means that there is no leak on the oil pipe (5). At this time, the second ball is thrown. When the second-level ball (36) falls on the second ball seat (32c), the rubber tube member (33a) and the rubber tube of the packer (4) form a sealed space. If the pressure cannot be stabilized in the sealed space, it means that the seal of the packer (4) has failed. If the pressure can be stabilized, it means that the seal of the packer (4) is good and the leak is caused by the sleeve.

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