Wellbore Condition Mud Intrusion Test Device

Abstract

This utility model relates to the field of mud intrusion testing technology, specifically disclosing a mud intrusion testing device under well conditions. The device includes a housing, with two hydraulic cylinders bolted to the lower surface of the housing. A sealing mechanism for sealing the device is located at the upper end of the housing, and a conveying mechanism for conveying mud is located at the upper end of the sealing mechanism. Through the sealing mechanism, when the pressure inside the housing increases, it pushes the piston vertically, thereby moving the compression plate. This compresses the air inside the compression chamber, and the compressed air enters the expansion bladder. After expansion, the bladder tightly adheres to the outer surface of the feed component, effectively reducing the possibility of mud leakage. The hydraulic cylinders drive the adjusting plate vertically, allowing adjustment of the size of the simulation chamber inside the housing to easily simulate wells of different sizes and environments.

Description

Technical Field

[0001] This utility model relates to the field of mud intrusion testing technology, and in particular to a mud intrusion testing device under well conditions. Background Technology

[0002] The wellbore-condition mud intrusion test apparatus is a core device for simulating the infiltration of mud filtrate into the formation during oil and gas drilling. It aims to reproduce complex downhole conditions such as high pressure, high temperature, and dynamic circulation, providing experimental basis for logging response correction, reservoir damage assessment, and mud formulation optimization. By simulating the wellbore, such as a combination of a 260mm diameter autoclave and a fan-shaped formation module (e.g., a 22.5° fan-shaped structure), the apparatus can generate a radial pressure difference to simulate the infiltration process of mud filtrate between the wellbore and the formation.

[0003] Existing equipment alters the original characteristics of the reservoir due to the intrusion of drilling mud, such as fluid type, fluid saturation, permeability, acoustic, electrical, and nuclear properties, making logging measurements unable to reflect the true nature of the formation.

[0004] An existing patent (publication number: CN219202605U) discloses a well logging model demonstration device, which includes a simulated formation, a drive assembly, a support assembly, a drum, and a pulley. The simulated formation has a wellbore drilled vertically, and the simulated formation, from near to far along the wellbore, consists of a flushing zone, a transition zone, and undisturbed formation. The drive assembly is located at the top of the simulated formation; the support assembly is located at the top of the simulated derrick, next to the drive assembly; the drum is connected to the power output end of the drive assembly, and a steel wire rope is wound on the drum; the pulley is located at the top of the support assembly, and the steel wire rope passes around the pulley and extends vertically into the wellbore; the drilling instrument is connected to the end of the steel wire rope. Through the simulated formation, it allows students to recognize the intrusive formation zone formed after mud intrusion and to understand the characteristics of the intrusive formation zone.

[0005] To address the aforementioned issues, while existing patents offer solutions that simulate geological formations to help students understand the characteristics of intrusive strata formed by mud intrusion, their sealing performance is poor. Leakage can easily occur after mud is injected into the model, leading to changes in the internal pressure of the device and consequently affecting the simulation results. Summary of the Invention

[0006] The purpose of this invention is to provide a mud intrusion test device under well conditions. When the pressure inside the device casing increases, it pushes the piston to move vertically, which in turn drives the compression plate to move. This compresses the air inside the compression chamber. The compressed air enters the expansion bladder, which expands and fits tightly against the outer surface of the feed component, thereby effectively reducing the leakage of mud inside. The hydraulic cylinder drives the adjustment plate to move vertically, which allows for adjustment of the size of the simulation chamber inside the device casing. This facilitates the simulation of wells of different sizes and environments, thus solving the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a mud intrusion test device under well conditions, including a device shell, two hydraulic cylinders fixed to the lower surface of the device shell by bolts, a sealing mechanism for sealing the device is provided at the upper end of the device shell, and a conveying mechanism for conveying mud is provided at the upper end of the sealing mechanism.

[0008] The sealing mechanism includes a feeding component, which is telescopically connected to the upper end of the device housing. Four pistons are telescopically connected to the upper surface of the inner wall of the device housing. A compression plate is fixed to the end of each of the four pistons. A compressed air chamber is provided above the compression plate and opened inside the device housing. An expansion air bladder is provided on the inner wall of the device housing and sleeved on the outer surface of the feeding component. The expansion air bladder is in communication with the compressed air chamber.

[0009] Preferably, the feed member has a flow cavity inside, and the lower end of the feed member has a discharge hole that communicates with the flow cavity.

[0010] Preferably, the lower surface of the feed member is fixed with an adjusting plate that fits tightly against the inner surface of the device housing by bolts, and the telescopic ends of the two hydraulic cylinders are fixedly connected to the adjusting plate.

[0011] Preferably, the outer surface of the device housing is connected to a discharge pipe, and a valve is fixed to the outer wall of the discharge pipe.

[0012] Preferably, the conveying mechanism includes pressure detectors, and two pressure detectors are provided. The two pressure detectors are respectively disposed on the upper surface of the discharge pipe and the feed member, and one of the pressure detectors is provided with a conveying pipe communicating with the feed member on one side.

[0013] Preferably, a high-pressure pump is connected to the end of the delivery pipe, and a filter element is connected to the input end of the high-pressure pump through a pipe.

[0014] Preferably, a storage box is connected to one side of the filter element, a filter screen plate is installed vertically inside the filter element, both ends of the filter screen plate are fixed with clips that are inserted and connected to the filter element, and a movable plate that is movably connected to the filter element is fixed on the upper surface of the filter screen plate.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. Through the sealing mechanism, when the pressure inside the device housing increases, it will push the piston to move vertically, which in turn drives the compression plate to move, compressing the air inside the compression chamber. The compressed air enters the expansion bladder, and after the expansion bladder expands, it will fit tightly against the outer surface of the feed component, thereby effectively reducing the leakage of internal mud. The hydraulic cylinder drives the adjustment plate to move vertically, which can adjust the size of the simulation cavity inside the device housing, making it convenient to simulate wellbore of different sizes and environments.

[0017] 2. Through the set conveying mechanism, the high-pressure pump extracts the mud stored in the storage tank. When the mud passes through the filter element, the filter screen plate set in the filter element can filter out the larger particles in the mud, thereby reducing the possibility of blockage in subsequent conveying. The filtered mud is conveyed to the feed element through the conveying pipe. Pulling the movable plate vertically in the direction can remove the filter screen plate from the filter element, which is convenient for cleaning and replacing the filter screen plate. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is an overall structural view of the present invention;

[0020] Figure 2 This is a half-sectional structural diagram of the outer shell of the device of this utility model;

[0021] Figure 3 This is a three-dimensional structural diagram of the filter element of this utility model;

[0022] Figure 4 This is a half-sectional structural diagram of the filter element of this utility model.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Device housing; 2. Hydraulic cylinder; 3. Feeding component; 31. Piston; 32. Compression plate; 33. Compression chamber; 34. Expansion bladder; 35. Flow chamber; 36. Discharge hole; 37. Adjusting plate; 4. Discharge pipe; 5. Valve; 6. Pressure detector; 61. Conveying pipe; 62. High-pressure pump; 63. Filter element; 64. Storage tank; 65. Movable plate; 66. Filter screen; 67. Clamping block. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] This utility model provides a technical solution:

[0027] Please see Figures 1 to 4 The wellbore mud intrusion test device includes a device housing 1. Two hydraulic cylinders 2 are fixed to the lower surface of the device housing 1 by bolts. The upper end of the device housing 1 is provided with a sealing mechanism for sealing the device, and the upper end of the sealing mechanism is provided with a conveying mechanism for conveying mud.

[0028] The sealing mechanism includes a feed element 3, which is telescopically connected to the upper end of the device housing 1. Four pistons 31 are telescopically connected to the upper surface of the inner wall of the device housing 1. A compression plate 32 is fixed to the end of each of the four pistons 31. A compression chamber 33 is provided above the compression plate 32 and is located inside the device housing 1. An expansion bladder 34 is provided on the inner wall of the device housing 1 and is fitted onto the outer surface of the feed element 3. The expansion bladder 34 is connected to the compression chamber 33. A flow chamber 35 is provided inside the feed element 3. A discharge hole 36 is provided at the lower end of the feed element 3 and is connected to the flow chamber 35. An adjustment plate 37 that fits tightly against the inner surface of the device housing 1 is fixed to the lower surface of the feed element 3 by bolts. The telescopic ends of the two hydraulic cylinders 2 are fixedly connected to the adjustment plate 37. A discharge pipe 4 is connected to the outer surface of the device housing 1. A valve 5 is fixed to the outer wall of the discharge pipe 4.

[0029] By adopting the above technical solution, the outer casing 1 of the device is placed in a suitable position. The mud entering the feed component 3 flows through the flow chamber 35 and is then discharged into the interior of the outer casing 1 through the discharge hole 36. Under the action of pressure difference, the mud penetrates the core in the formation cavity through the simulated layer inside the outer casing 1. The valve 5 on the discharge pipe 4 is in the closed state. The pressure change is recorded by the pressure detector 6 on the discharge pipe 4, and the injection pressure and formation pressure data collected by the pressure detector 6 are transmitted to the control system such as PLC in real time. If the pressure is lower than the target value, the control system automatically turns on the high-pressure pump 62 to increase the mud injection volume. If the pressure is too high, the valve 5 automatically closes. When the pressure inside the device housing 1 increases, the piston 31 moves vertically, which in turn moves the compression plate 32. This compresses the air inside the compression chamber 33. The compressed air then enters the expansion bladder 34. After the expansion bladder 34 expands, it fits tightly against the outer surface of the feed component 3, effectively reducing the leakage of internal mud. Furthermore, the hydraulic cylinder 2 can drive the adjusting plate 37 to move vertically, thus adjusting the size of the simulation chamber inside the device housing 1. This allows for the simulation of wellbore spaces of different sizes, improving practicality.

[0030] Specifically, such as Figure 2 , Figure 3 and Figure 4 As shown, the conveying mechanism includes two pressure detectors 6. The two pressure detectors 6 are respectively installed on the upper surface of the discharge pipe 4 and the feed component 3. One side of one of the pressure detectors 6 is provided with a conveying pipe 61 that is connected to the feed component 3. The end of the conveying pipe 61 is connected to a high-pressure pump 62. The input end of the high-pressure pump 62 is connected to a filter element 63 through a pipe. One side of the filter element 63 is connected to a storage box 64. A filter screen plate 66 is installed vertically inside the filter element 63. Both ends of the filter screen plate 66 are fixed with a locking block 67 that is inserted and connected to the filter element 63. A movable plate 65 that is movably connected to the filter element 63 is fixed on the upper surface of the filter screen plate 66.

[0031] By adopting the above technical solution, the high-pressure pump 62 can extract the mud stored in the storage tank 64. When the mud passes through the filter element 63, the filter screen 66 installed in the filter element 63 can filter out larger particles in the mud, thereby reducing the possibility of blockage during subsequent transportation. The filtered mud is transported to the feed element 3 through the conveying pipe 61. The movable plate 65 can be pulled vertically by the locking block 67 installed on the filter screen 66, thereby removing the filter screen 66 from the filter element 63 for easy cleaning and replacement. The pressure detector 6 installed on the conveying pipe 61 can detect the conveying pressure of the mud.

[0032] Working principle: The high-pressure pump 62 extracts the mud stored in the storage tank 64. When the mud passes through the filter element 63, the filter screen 66 installed inside the filter element 63 can filter out larger particles in the mud, thereby reducing the possibility of blockage in subsequent transportation. The filtered mud is transported to the feed unit 3 through the conveying pipe 61. The movable plate 65 can be pulled vertically by the locking block 67 on the filter screen 66, thereby removing the filter screen 66 from the filter element 63 for easy cleaning and replacement. The pressure detector 6 installed on the conveying pipe 61 can detect the conveying pressure of the mud. The mud entering the feed unit 3 flows through the flow chamber 35 and is discharged into the interior of the device shell 1 through the discharge hole 36. It then penetrates the core material in the formation cavity through the simulated layer inside the device shell 1. The valve 5 on the discharge pipe 4 is in the closed state, and the mud is discharged through the discharge... The pressure detector 6 on pipe 4 records pressure changes, and the injection pressure and formation pressure data collected by the pressure detector 6 are transmitted to the control system such as PLC in real time. If the pressure is lower than the target value, the control system automatically turns on the high-pressure pump 62 to increase the amount of mud injected. If the pressure is too high, the valve 5 automatically closes or triggers the throttle valve 5 on the discharge pipe 4 to ensure pressure stability. When the pressure inside the device housing 1 increases, it will push the piston 31 to move vertically, which in turn drives the compression plate 32 to move, which can compress the air inside the compression chamber 33. The compressed air enters the expansion bladder 34. After the expansion bladder 34 expands, it will fit tightly against the outer surface of the feed component 3, thereby effectively reducing the leakage of mud inside. In addition, the hydraulic cylinder 2 can drive the adjustment plate 37 to move vertically, which can adjust the size of the simulated cavity space inside the device housing 1.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A mud intrusion test device under well conditions, comprising a device housing (1), wherein two hydraulic cylinders (2) are fixed to the lower surface of the device housing (1) by bolts, characterized in that: The upper end of the device housing (1) is provided with a sealing mechanism for sealing the device, and the upper end of the sealing mechanism is provided with a conveying mechanism for conveying mud. The sealing mechanism includes a feeding component (3), which is telescopically connected to the upper end of the device housing (1). Four pistons (31) are telescopically connected to the upper surface of the inner wall of the device housing (1). A compression plate (32) is fixed to the end of each of the four pistons (31). A compressed air chamber (33) is provided above the compression plate (32) and is located inside the device housing (1). An expansion air bladder (34) is provided on the inner wall of the device housing (1) and is fitted on the outer surface of the feeding component (3). The expansion air bladder (34) is connected to the compressed air chamber (33).

2. The wellbore mud invasion test device according to claim 1, characterized in that: The feed member (3) has a flow cavity (35) inside, and the lower end of the feed member (3) has a discharge hole (36) that communicates with the flow cavity (35).

3. The wellbore mud invasion test apparatus according to claim 2, characterized in that: The lower surface of the feed piece (3) is fixed with an adjustment plate (37) that fits tightly against the inner surface of the device housing (1) by bolts, and the telescopic ends of the two hydraulic cylinders (2) are fixedly connected to the adjustment plate (37).

4. The wellbore mud invasion test device according to claim 3, characterized in that: The outer surface of the device housing (1) is connected to a discharge pipe (4), and a valve (5) is fixed on the outer wall of the discharge pipe (4).

5. The wellbore mud invasion test apparatus according to claim 4, characterized in that: The conveying mechanism includes a pressure detector (6), and there are two pressure detectors (6). The two pressure detectors (6) are respectively installed on the upper surface of the discharge pipe (4) and the feed member (3). One side of one of the pressure detectors (6) is provided with a conveying pipe (61) that is connected to the feed member (3).

6. The wellbore mud invasion test apparatus according to claim 5, characterized in that: The end of the delivery pipe (61) is connected to a high-pressure pump (62), and the input end of the high-pressure pump (62) is connected to a filter element (63) through a pipe.

7. The wellbore mud invasion test apparatus according to claim 6, characterized in that: The filter element (63) is connected to a storage box (64) on one side. A filter screen plate (66) is installed vertically inside the filter element (63). Both ends of the filter screen plate (66) are fixed with a locking block (67) that is inserted and connected to the filter element (63). A movable plate (65) that is movably connected to the filter element (63) is fixed on the upper surface of the filter screen plate (66).

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