Ball sealer experiment device of bridge plug

Abstract

The utility model relates to the technical field of oil and gas exploitation equipment testing, in particular to a plugging ball experimental device of a bridge plug, which comprises an outer sleeve, a front plug, a rear plug, an experimental inner ball seat and a plugging ball, the outer sleeve is of a circular-tube-shaped structure, serves as a supporting component of the body and is used for installing and bearing other components. The front plug and the rear plug are detachably installed at the two ends of the outer sleeve respectively. The experiment inner ball seat is arranged in the outer sleeve and is in sealed connection with the outer sleeve; liquid drainage holes are formed in the front plug, the rear plug and the experiment inner ball seat, and liquid in an experiment can pass through the liquid drainage holes; and the ball sealer is clamped on the experiment inner ball seat for completing the ball sealer experiment. The experimental device provided by the utility model replaces a bridge plug to carry out a ball sealer experiment; a bridge plug does not need to be consumed, the purchase cost is reduced, and meanwhile the device is simple in structure, low in machining cost and capable of being repeatedly used; the tedious process of multiple times of bridge plug setting in a traditional experiment is avoided, the experiment time is greatly shortened, and the experiment efficiency is remarkably improved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and gas production equipment testing, in particular to a sealing ball experimental device for a bridge plug. Background Art

[0002] In the oil and gas development sector, with the continuous advancement of horizontal well technology, techniques such as staged fracturing are becoming increasingly mature. Bridge plugs, as key sealing devices in horizontal well oil and gas production, play a vital role. Soluble bridge plugs are widely used due to their ease of operation and simple structure, as they dissolve directly when the tubing is unsealed. However, their use requires the use of soluble sealing balls.

[0003] The current experiment on sealing balls is to seat the bridge plug in the casing, and then insert the sealing ball to complete pressure bearing, temperature bearing, internal and external pressure difference and other experiments. However, this experimental method has many disadvantages: each sealing ball needs to be equipped with a sealing bridge plug, and when the bridge plug is not seated effectively, it is easy to slip. During the heating process, the bridge plug may also dissolve prematurely, resulting in the inability to complete the internal and external pressure difference experiment, and it is often necessary to seat the bridge plug multiple times. Since soluble bridge plugs are disposable products, a sealing ball experiment may require the consumption of multiple bridge plugs, which makes the experimental construction time-consuming, costly and cumbersome, seriously hindering the smooth completion of the sealing ball experiment.

[0004] Therefore, it is of great practical significance to develop a new blocking ball experimental device that can overcome the defects of existing experimental methods. Utility Model Content

[0005] The utility model aims to provide a sealing ball experimental device for a bridge plug, which is used to simulate the structure of the bridge plug and is used for performance testing of the sealing balls of the bridge plug, thereby solving the technical problems in the background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a bridge plug sealing ball experimental device, comprising: an outer sleeve, a front plug, a rear plug, an experimental inner ball seat and a sealing ball;

[0007] The outer sleeve is a circular tubular structure, serving as a supporting component of the main body and used to install and carry other components;

[0008] The front plug and the rear plug are detachably mounted on both ends of the outer sleeve; the experimental inner ball seat is arranged inside the outer sleeve and is sealed with the outer sleeve;

[0009] The front plug, the rear plug and the experimental inner ball seat are all provided with drainage holes for the liquid to pass through during the experiment;

[0010] The blocking ball is clamped on the ball seat in the experiment to complete the blocking ball experiment.

[0011] Furthermore, a groove is provided on the experimental inner ball seat, the side wall of the groove is a spherical curved surface matching the spherical surface of the blocking ball, and the depth of the groove is smaller than the radius of the blocking ball.

[0012] Furthermore, an external thread is provided on the outer wall of the experimental inner ball seat, and an internal thread is correspondingly provided on the inner wall of the outer sleeve, and the experimental inner ball seat is threadedly connected to the outer sleeve.

[0013] Furthermore, a sealing groove is provided on the experimental inner ball seat, and a sealing member is provided in the sealing groove.

[0014] Furthermore, a locking ring is provided at the bottom of the experimental inner ball seat; the locking ring is connected to the outer sleeve.

[0015] Furthermore, the front plug and the rear plug are respectively connected to the two ends of the outer sleeve by threads; the inner walls of the front plug and the rear plug are both provided with sealing grooves, and sealing elements are provided in the sealing grooves.

[0016] Beneficial effects

[0017] The experimental device of the utility model replaces the bridge plug to conduct the sealing ball experiment; the bridge plug does not need to be consumed, which reduces the procurement cost. At the same time, the device has a simple structure, low processing cost, and is reusable; long-term use can effectively save resources and costs, reduce the economic burden of oil and gas production equipment testing, and improve economic benefits.

[0018] The utility model avoids the tedious process of multiple bridge plug setting in traditional experiments, reduces the experiment interruption and repeated operation caused by bridge plug setting problems, greatly shortens the experiment time, significantly improves the experiment efficiency, and enables the performance test of the plugging ball to be completed more quickly and efficiently. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0020] Figure 1 This is a structural diagram of the blocking ball experimental device disclosed in the utility model;

[0021] Figure 2 It is a structural diagram of an experimental inner ball seat of a blocking ball experimental device disclosed in the utility model.

[0022] In the picture:

[0023] The reference numerals in the figures are: 1. outer sleeve; 2. front plug; 3. locking ring; 4. rear plug; 5. experimental inner ball seat; 6. sealing ball. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] In order to achieve the above purpose, the present invention provides the following technical solutions: Figure 1-2 As shown, an experimental device for a bridge plug with a sealing ball 6 includes: an outer sleeve 1, a front plug 2, a rear plug 4, an experimental inner ball seat 5 and a sealing ball 6;

[0026] The outer sleeve 1 serves as a supporting component of the main body and is used to install and support other components; the circular tubular structure of the outer sleeve 1 can accommodate experimental liquid, and provides storage and flow space for the liquid when conducting experiments such as pressure, temperature, and internal and external pressure difference, so that the experiment can be carried out in a relatively closed and stable environment.

[0027] The front plug 2 and the rear plug 4 are detachably mounted on both ends of the outer sleeve 1. The detachable mounting method of the front plug 2 and the rear plug 4 facilitates the assembly and disassembly of the experimental device, and is convenient for inspection, maintenance and cleaning of the interior of the device before and after the experiment.

[0028] The experimental inner ball seat 5 is arranged inside the outer sleeve 1 and is sealed with the outer sleeve 1;

[0029] The front plug 2, the rear plug 4 and the experimental inner ball seat 5 are all provided with drainage holes for the liquid to pass through during the experiment;

[0030] The drainage holes on the test inner ball seat 5 facilitate liquid circulation and pressure transmission during the experiment. Specifically, during the liquid pressurization experiment, as the sealing ball 6 gradually approaches the test inner ball seat 5, the liquid on the test inner ball seat 5 is squeezed by the sealing ball 6 and flows out of the drainage holes. After the experiment is completed, the drainage holes also serve as a liquid discharge device within the outer sleeve 1.

[0031] When conducting an internal and external pressure difference experiment, it is necessary to connect two pressure measuring devices to the experimental device to measure the pressure on both sides of the sealing ball 6 respectively. At this time, liquid needs to be input on both sides of the sealing ball 6, and the pressure on the side of the front plug 2 in the device is made higher than the pressure on the side of the rear plug 4 through the liquid pressurizing device, forming an internal and external pressure difference, and observing the state of the sealing ball 6 under the internal and external pressure difference state; at this time, the drainage hole on the ball seat 5 in the experiment plays the role of transmitting pressure.

[0032] The sealing ball 6 is clipped onto the experimental inner ball seat 5 and forms a sealing structure with the experimental inner ball seat 5; the sealing ball 6 is the object of the experiment. During the experiment, the working state of the sealing ball 6 in the actual bridge plug is simulated by cooperating with the experimental inner ball seat 5. In the pressure test, the sealing ball 6 withstands the pressure from the liquid to test its pressure resistance; in the temperature test, the sealing ball 6 is exposed to a high temperature environment to examine the performance changes of its material under high temperature; in the internal and external pressure difference test, the sealing ball 6 is subjected to the pressure difference on both sides to test its sealing performance and ability to withstand the pressure difference. Accurate testing of the performance of the sealing ball 6 is of great significance for evaluating the reliability and stability of its bridge plug sealing work in actual oil and gas production.

[0033] During the specific experimental process, different supporting equipment needs to be used in conjunction with this experimental device according to the content of the experiment. For example, the pressure experiment requires a liquid pressurizing device, and the temperature experiment also requires a heating device.

[0034] Furthermore, the inner ball seat 5 is provided with a groove, the sidewall of which is a spherical curved surface that matches the spherical surface of the blocking ball 6. The depth of the groove is less than the radius of the blocking ball 6. When the blocking ball 6 descends into the groove, because the depth of the groove is less than the radius of the blocking ball 6, the lower half of the spherical surface of the blocking ball 6 gradually contacts the sidewall of the groove until it is completely in contact, achieving a seal and completing the sealing work.

[0035] Furthermore, an external thread is provided on the outer wall of the experimental inner ball seat 5 , and an internal thread is correspondingly provided on the inner wall of the outer sleeve 1 , and the experimental inner ball seat 5 is threadedly connected to the outer sleeve 1 .

[0036] Furthermore, a sealing groove is provided on the experimental inner ball seat 5 , and a sealing member is provided in the sealing groove, which can enhance the sealing between the experimental inner ball seat 5 and the outer sleeve 1 .

[0037] Furthermore, a locking ring 3 is provided at the bottom of the test inner ball seat 5; this locking ring 3 is connected to the outer sleeve 1 and further secures the test inner ball seat 5. During the experiment, especially when subjected to high pressure or temperature fluctuations, this ring prevents the test inner ball seat 5 from loosening or shifting due to external forces, ensuring the stability of the connection between the test inner ball seat 5 and the outer sleeve 1, thereby ensuring the sealing effect of the sealing ball 6 in the groove of the test inner ball seat 5 and the accuracy of the experiment.

[0038] Furthermore, the front plug 2 and the rear plug 4 are respectively threadedly connected to the two ends of the outer sleeve 1; the inner walls of the front plug 2 and the rear plug 4 are provided with sealing grooves, and sealing members are provided in the sealing grooves, which can enhance the sealing between the front plug 2 and the rear plug 4 and the outer sleeve 1.

[0039] The working principle and process are as follows:

[0040] When conducting a pressure test on the sealing ball 6, after assembling the experimental device, connect the device to the liquid pressurizing device. The interface of the liquid pressurizing device is connected to the drainage holes of the front plug 2 and the rear plug 4, and the liquid flows from the front plug 2 to the rear plug 4.

[0041] The liquid pressurization device is activated, and liquid enters the outer sleeve 1. As the liquid pressure increases, the sealing ball 6 moves downward under the pressure. When the sealing ball 6 reaches the groove of the test ball seat 5, the shape of the groove sidewall matches that of the sealing ball 6, and the sealing ball 6 fits tightly with the groove sidewall to achieve a seal. At this point, the liquid pressure is further increased, and the pressure on the sealing ball 6 is monitored using measuring equipment such as pressure sensors. The state of the sealing ball 6 under different pressures (such as deformation, leakage, etc.) is recorded, thus completing the pressure test of the sealing ball 6.

[0042] It should be noted that when conducting the temperature bearing experiment of the sealing balls 6, it is necessary to first install a heating device outside the experimental device and ensure that the heating device can effectively heat the liquid in the experimental device.

[0043] As the temperature rises, observe the performance changes of the sealing ball 6 at different temperatures, such as the softening degree of the material and the change in sealing performance. Use a temperature sensor to monitor the temperature of the liquid in the experimental device, record the state of the sealing ball 6 under different temperature conditions, and complete the temperature experiment.

[0044] It should be noted that when conducting the internal and external pressure difference experiment, two pressure measuring devices need to be connected to the experimental device to measure the pressure on both sides of the sealing ball 6 respectively; during the experiment, the pressure changes on both sides of the sealing ball 6 are monitored in real time, and the sealing performance of the sealing ball 6 under the action of the internal and external pressure difference is observed. The maximum internal and external pressure difference that the sealing ball 6 can withstand and its status under different pressure differences are recorded to complete the internal and external pressure difference experiment.

[0045] The embodiments of the present invention are provided for purposes of illustration and description and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention and to enable those skilled in the art to understand the present invention and design various embodiments with various modifications suitable for specific applications.

Claims

1. A bridge plug sealing ball experimental device, characterized in that: include: An outer sleeve (1), a front plug (2), a rear plug (4), an experimental inner ball seat (5) and a sealing ball (6); The outer sleeve (1) is a circular tubular structure, serving as a supporting component of the main body and used for mounting and supporting other components; The front plug (2) and the rear plug (4) are detachably mounted on both ends of the outer sleeve (1); the experimental inner ball seat (5) is arranged inside the outer sleeve (1) and is sealed with the outer sleeve (1); The front plug (2), the rear plug (4) and the experimental inner ball seat (5) are all provided with drainage holes for allowing liquid to pass through during the experiment; The blocking ball (6) is clamped on the experimental inner ball seat (5) to complete the blocking ball (6) experiment.

2. The bridge plug sealing ball experimental device according to claim 1, characterized in that: The experimental inner ball seat (5) is provided with a groove, the side wall of the groove is a spherical curved surface that matches the spherical surface of the blocking ball (6), and the depth of the groove is smaller than the radius of the blocking ball (6).

3. The bridge plug sealing ball experimental device according to claim 2, characterized in that: An external thread is provided on the outer wall of the experimental inner ball seat (5), and an internal thread is correspondingly provided on the inner wall of the outer sleeve (1). The experimental inner ball seat (5) is threadedly connected to the outer sleeve (1).

4. The bridge plug sealing ball experimental device according to claim 3, characterized in that: The experimental inner ball seat (5) is also provided with a sealing groove, and a sealing member is provided in the sealing groove.

5. The bridge plug sealing ball experimental device according to claim 1, characterized in that: A locking ring (3) is also provided at the bottom of the experimental inner ball seat (5); the locking ring (3) is threadedly connected to the outer sleeve (1).

6. The bridge plug sealing ball experimental device according to claim 1, characterized in that: The front plug (2) and the rear plug (4) are respectively connected to the two ends of the outer sleeve (1) by threads; the inner walls of the front plug (2) and the rear plug (4) are both provided with sealing grooves, and sealing elements are provided in the sealing grooves.

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