Adjacent well casing gas utilization well logging device

Abstract

The utility model discloses an adjacent well casing gas utilization logging device, which relates to the technical field of oil and gas production and comprises a rotational flow pipe, the rotational flow pipe is connected with an adapter, the adapter is fixedly connected with a swing check valve, the swing check valve is connected with one end of a continuous hose through a Park joint, and the other end of the continuous hose is connected with a quick joint. Casing gas resources commonly existing among oil wells in the same well site are utilized, it is ensured that continuous and stable sound source energy can be provided for dynamic liquid level testing even under the condition that casing pressure is low or unstable, a nitrogen cylinder does not need to be connected, the labor intensity of workers is greatly reduced, the testing efficiency is improved, and the testing cost is reduced. And meanwhile, nitrogen is not required to be purchased for filling, so that the purposes of reducing cost and increasing efficiency are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil and gas production, and relates to a device for testing the dynamic liquid level, in particular to a logging device for utilizing the casing gas of adjacent wells. Background Technique

[0002] The dynamic liquid level test of oil wells is an important monitoring work in oil production, mainly used to understand the formation liquid supply capacity of oil wells, whether the working system is reasonable, and to conduct dynamic analysis of oil wells; the dynamic liquid level is the liquid level position in the annular space between the tubing and the casing when the pumping well is in normal production. This liquid level can be expressed by the depth measured from the wellhead or the height measured from the middle of the oil layer. The dynamic liquid level is an important indicator reflecting the formation liquid supply capacity and is also an important basis for the oilfield to determine a reasonable submergence degree and formulate a reasonable working system.

[0003] At present, the most commonly used measurement method in current oilfield production mainly uses acoustic logging. By emitting acoustic waves (such as infrasonic waves) into the oil well, echoes will be generated when the acoustic waves encounter obstacles such as casing collars and liquid levels during propagation. By receiving and analyzing these echo signals, the position of the dynamic liquid level can be calculated. However, during the dynamic liquid level test of oil wells, it may be impossible to test the dynamic liquid level in some oil wells due to low casing pressure or no casing gas. To solve this problem, methods such as connecting nitrogen cylinders can be used for testing, which not only greatly increases the labor intensity of employees, affects the test efficiency, but also requires nitrogen filling costs.

[0004] Therefore, there is an urgent need for a logging device for utilizing the casing gas of adjacent wells to utilize the casing gas of adjacent wells for dynamic liquid level testing, so as to improve the success rate and test efficiency of dynamic liquid level testing, achieve cost reduction and efficiency increase, and solve the problem that it may be impossible to test the dynamic liquid level in some oil wells due to low casing pressure or no casing gas during the daily dynamic liquid level test. Content of the Utility Model

[0005] The purpose of the utility model is to provide a logging device for utilizing the casing gas of adjacent wells, which can utilize the casing gas of adjacent wells for dynamic liquid level testing to overcome the deficiency that it may be impossible to test the dynamic liquid level in some oil wells due to low casing pressure or no casing gas in the actual application of the prior art.

[0006] To achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A logging device for utilizing the casing gas of adjacent wells includes a swirl tube, the swirl tube is connected to a swivel joint, the swivel joint is fixedly connected with a swing check valve, the swing check valve is connected to one end of a continuous hose through a Parker joint, and the other end of the continuous hose is connected to a quick connector.

[0008] Furthermore, the cyclone tube includes a central tube core. The central tube core rectifies the airflow transmitted from the sleeve, and can effectively convert the disordered airflow in the incoming gas of the sleeve into an orderly and stable airflow, stabilizing the airflow direction. This rectification process helps to reduce the vortex and turbulence phenomena in the airflow and reduce the non-uniformity of the airflow velocity. A plurality of swirl grooves are provided on the inner surface of the central tube core. The number of swirl grooves will directly affect the degree of obstruction when the airflow passes through the cyclone tube. The more the number of swirl grooves, the greater the obstruction when the airflow passes through the cyclone tube, and a greater throttling pressure difference will be generated. The fewer the number of swirl grooves, the smaller the obstruction when the airflow passes through the cyclone tube, and the smaller the generated throttling pressure difference.

[0009] Furthermore, one end of the central tube core is connected to one end of a straight tube type cyclone. As a part of the cyclone system, the main function of the straight tube type cyclone is to generate a strong rotational movement when guiding the fluid into the cyclone. This rotational movement is the key for the cyclone to achieve solid-liquid separation or gas-liquid separation. The other end of the straight tube type cyclone is connected to a throttle. The throttle increases the velocity of the fluid by reducing the flow cross-sectional area of the fluid, throttles and pressurizes the flowing airflow, increases the amplitude of the pressure fluctuation at the outlet end, and improves the accuracy of the dynamic liquid level measurement result.

[0010] Furthermore, the throttle is connected to the adapter through a screw thread to achieve thread conversion through the adapter.

[0011] Furthermore, the swing check valve is connected to the adapter through a screw thread and is used for opening and closing the device process.

[0012] Furthermore, the maximum length of the continuous hose is 10 m and the maximum pressure resistance is 5 Mpa.

[0013] Furthermore, the quick connector is connected to the test gun by a screw thread.

[0014] Furthermore, the adapter realizes the conversion of multiple sizes from 12.5 mm to 50 mm in diameter for matching the size of the test gun. The main function of the adapter is to achieve the conversion between different thread specifications. Since the cyclone tube and subsequent equipment or pipelines may adopt different thread standards or sizes, direct connection may cause difficulties or problems with poor sealing. Through its specially designed thread structure, the adapter can smoothly connect these two components with different specifications, ensuring the tightness and reliability of the connection.

[0015] Furthermore, a thread is provided on the inner side of the left end of the cyclone tube, and it is connected to the wellhead casing through the thread.

[0016] Furthermore, the continuous hose is connected to the quick connector by means of a clamp.

[0017] Compared with the prior art, the present utility model has the following beneficial technical effects:

[0018] The utility model provides a logging device for utilizing casing gas from adjacent wells, which solves the problems of unstable liquid level testing, low success rate and low efficiency in the dynamic liquid level testing of wells with no or low casing gas in traditional testing methods. By utilizing the casing gas resources commonly existing among oil wells in the same well field, the number of swirl grooves on the inner surface of the inner core of the central pipe in the swirl tube is adjusted to regulate the air flow and control the casing gas, ensuring that the air flow passing through the swirl tube can generate a stable vortex motion, thereby effectively regulating the casing gas pressure and flow rate output to the logging device, ensuring that even in the case of low or unstable casing pressure, continuous and stable sound source energy can be provided for the dynamic liquid level testing, and there is no need to connect a nitrogen cylinder, greatly reducing the labor intensity of employees, improving the testing efficiency, and at the same time, there is no need to purchase nitrogen filling, achieving the purpose of cost reduction and efficiency improvement.

[0019] Furthermore, the device of the utility model has a simple structure, simplifies the testing process, and the testing personnel do not need to frequently adjust parameters. They can complete the dynamic liquid level testing of oil wells with simple operations, which not only significantly reduces the work burden of the testing personnel, but also greatly improves the convenience and safety of the testing operation. Moreover, during the testing process, with the precise control of the air flow and the size of the casing gas, the efficiency, stability and accuracy of the testing results have been significantly improved. Description of the Drawings

[0020] Figure 1 It is a schematic diagram of the overall logging device for utilizing casing gas from adjacent wells in the embodiment of the utility model.

[0021] Figure 2 It is a schematic cross-sectional view of the swirl tube adopted by the logging device for utilizing casing gas from adjacent wells in the embodiment of the utility model.

[0022] In the figure, 1. swirl tube; 2. adapter; 3. swing check valve; 4. Parker fitting; 5. continuous hose; 6. quick coupling; 7. inner core of the central pipe; 8. swirl groove; 9. straight tube type cyclone; 10. restrictor. Detailed Embodiments

[0023] In order to enable those skilled in the art of this technology to better understand the solution of the utility model, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the utility model.

[0024] It should be noted that the terms "first", "second", etc. in the description, claims and above-mentioned drawings of the present utility model are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of the present utility model described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0025] The present utility model provides a logging device for utilizing casing gas of adjacent wells, which can utilize the casing gas of adjacent wells to conduct flowing fluid level tests, and solve the problems of unstable flowing fluid level tests, low success rate and low efficiency in the traditional test methods for wells with no or low casing gas.

[0026] Refer to Figures 1 to 2 , the present utility model provides a logging device for utilizing casing gas of adjacent wells, including a swirl tube 1. The swirl tube 1 is connected to a conversion joint 2 by means of screw connection. The conversion joint 2 is fixedly connected to a swing check valve 3 by means of welding. The swing check valve 3 is connected to a Parker fitting 4 by means of screw connection. The Parker fitting 4 is connected to a continuous hose 5 by means of a clamp. The continuous hose 5 is connected to a quick connector 6 by means of a clamp; in the connection between the fitting and the continuous hose 5, the clamp is usually designed to be able to tightly wrap the outer wall of the continuous hose 5 and the part connected to the fitting. By tightening the bolts or nuts of the clamp, the clamp is tightened, so as to achieve the effects of sealing and fixing.

[0027] The conversion joint 2 is mainly used to realize the conversion between different thread specifications. Since the swirl tube 1 and subsequent equipment or pipelines may adopt different thread standards or sizes, direct connection may have difficulties or problems of poor sealing. Through the conversion joint 2, two components with different specifications can be smoothly connected to ensure the tightness and reliability between the connected components; screw connection is a traditional connection method, which has the advantages of simple structure, reliable connection and good sealing performance; in harsh working conditions such as oil and gas fields, screw connection can ensure the tight connection between equipment and prevent fluid leakage; the swing check valve 3 is a valve that can automatically prevent the reverse flow of the medium. When there is an air flow input from the swirl tube and passes through the swing check valve 3, the valve automatically opens to allow the air flow to pass through. When the air flow passes through the swing check valve 3 and then moves in the direction of the swirl tube 1, the valve automatically closes to prevent the reverse flow of the air flow.

[0028] The swirl tube 1 includes a central tube core 7, and a plurality of swirl grooves 8 are arranged on the inner surface of the central tube core 7; the central tube core 7 can rectify the airflow transmitted from the casing, and organize the possible turbulent and disordered airflow transmitted from the casing into a stable and orderly airflow, thereby reducing the fluctuation influence of the transmitted airflow; by changing the number of swirl grooves 8 in the central tube core 7, the resistance of the airflow passing through the swirl tube 1 can be finely controlled, and the number of swirl grooves 8 will directly affect the degree of obstruction of the airflow passing through the swirl tube 1. The more the number of swirl grooves 8, the greater the obstruction of the airflow passing through the swirl tube 1, and a greater throttling pressure difference will be generated; the fewer the number of swirl grooves 8, the smaller the obstruction of the airflow passing through the swirl tube 1, and the smaller the throttling pressure difference generated; therefore, by controlling the number of swirl grooves 8, the throttling pressure difference of the oil well with low casing pressure or no casing gas can be increased to a measurable degree in the actual measurement of the dynamic liquid level. The inner side of the left end of the swirl tube 1 is provided with a thread, which is connected to the wellhead casing through the thread.

[0029] One end of the central tube inner core 7 is connected to one end of the straight tube cyclone 9, and the other end of the straight tube cyclone 9 is connected to the throttle 10; after the throttling pressure difference is adjusted by the swirl groove 8, the airflow entering the straight tube cyclone 9 is further stabilized. After the airflow enters the straight tube cyclone 9, the straight tube cyclone 9 fine-tunes the airflow direction to balance the airflow direction of the central tube inner core 7 entering the device, so that the airflow maintains a relatively stable horizontal flow inside the device. This horizontal flow not only helps to reduce energy loss, but also improves the working efficiency and treatment effect of the cyclone 1; the throttle 10 increases the resistance of the fluid passing through by reducing the flow cross-sectional area of ​​the airflow, thereby reducing the pressure of the airflow. During the throttling process, the flow velocity of the airflow will increase, but the total pressure will decrease. This is because energy conversion occurs when the airflow passes through the throttling port, and part of the pressure energy is converted into kinetic energy; in oil and gas field production, the throttle 10 stabilizes the downstream pressure and reduces pressure fluctuations by adjusting the flow rate, which is helpful for improving the accuracy of the dynamic liquid level measurement results.

[0030] In some embodiments, the quick connector 6 is connected to the test gun by threading.

[0031] In some embodiments, the conversion joint 2 can achieve conversion of multiple sizes ranging from 12.5 mm in diameter to 50 mm.

[0032] In some embodiments, the longest length of the continuous hose 5 is 10 m and the maximum pressure resistance is 5 MPa.

[0033] The workflow of this utility model:

[0034] Echo-type liquid level testing emits acoustic waves through the wellhead casing connector (generator). The acoustic waves travel along the annulus between the tubing and the casing towards the bottom of the well. When they encounter the liquid level, an echo is reflected back to the wellhead and received and recorded by the wellhead instrument. If the casing pressure of the oil well is too low to meet the requirement for directly exciting acoustic waves, in this case, the quick connector 6 of this device is connected to the wellhead casing of an adjacent well, and the swirl tube 1 is connected to the wellhead casing of the well to be measured. The swing check valve 3 is opened to introduce the casing gas from the adjacent well to increase the air pressure inside the device, which is then transmitted through the swirl tube 1 into the well to be measured until the requirement for exciting acoustic waves is met.

[0035] In the description of this specification, the descriptions with reference to terms such as "some embodiments", "optionally", "furthermore" or "some examples" etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0036] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A logging device for utilizing casing gas in adjacent wells, characterized in that: The invention comprises a swirl tube (1), the swirl tube (1) is connected to a conversion joint (2), the conversion joint (2) is fixedly connected to a swing check valve (3), the swing check valve (3) is connected to one end of a continuous hose (5) via a Parker joint (4), and the other end of the continuous hose (5) is connected to a quick joint (6).

2. The logging device for utilizing casing gas in adjacent wells according to claim 1, characterized in that: The swirl tube (1) comprises a central tube inner core (7), and a plurality of swirl grooves (8) are arranged on the inner surface of the central tube inner core (7).

3. The logging device for utilizing casing gas in adjacent wells according to claim 2, characterized in that: One end of the central tube inner core (7) is connected to one end of the straight tube cyclone (9), and the other end of the straight tube cyclone (9) is connected to the throttle (10).

4. A logging device for utilizing casing gas in adjacent wells according to claim 3, characterized in that: The throttle (10) is connected to the conversion joint (2) via a threaded connection.

5. The logging device for utilizing casing gas in adjacent wells according to claim 1, characterized in that: The swing check valve (3) is connected to the conversion joint (2) via a threaded connection.

6. The logging device for utilizing casing gas in adjacent wells according to claim 1, characterized in that: The Parker connector (4) is connected to the continuous hose (5) by means of a clamp connection. The continuous hose (5) is 10 m long and has a pressure resistance of 5 MPa.

7. The logging device for utilizing casing gas in adjacent wells according to claim 1, characterized in that: The quick connector (6) is connected to the test gun by means of a threaded connection.

8. The logging device for utilizing casing gas in adjacent wells according to claim 1, characterized in that: The conversion joint (2) realizes conversion of multiple sizes from 12.5 mm in diameter to 50 mm.

9. The logging device for utilizing casing gas in adjacent wells according to claim 1, characterized in that: The left end of the swirl tube (1) is provided with a thread inside, and is connected to the wellhead casing via the thread.

10. The logging device for utilizing casing gas in adjacent wells according to claim 1, characterized in that: The continuous hose (5) is connected to the quick connector (6) by means of a clamp.

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