An oilfield drilling fluid sampling device

Abstract

The utility model discloses a kind of oilfield drilling fluid sampling devices, it is related to sampler technical field, including sampling cylinder and small cyclone separator, built-in filter screen and liquid level sensor are installed in the sampling cylinder, and blowback mechanism is installed on the sampling cylinder, drainage pipe is installed on the sampling cylinder, control valve is installed on the drainage pipe, the small cyclone separator is installed on the sampling cylinder, first connecting pipe is connected on the sampling cylinder, the other end of the first connecting pipe is connected with U-shaped tube by connecting assembly, the other end of the U-shaped tube is connected with second connecting pipe by connecting assembly, the other end of the second connecting pipe is connected with small cyclone separator, telescopic liquid inlet pipe is connected on the small cyclone separator;The utility model is through setting the double filtration structure of small cyclone separator and built-in filter screen, greatly improves sample purity, and liquid level sensor and blowback mechanism are equipped with collaborative work, realize intelligent automatic cleaning and maintenance.

Description

Technical Field

[0001] This utility model relates to the field of sampler technology, specifically to an oilfield drilling fluid sampling device. Background Technology

[0002] In the process of oil and gas exploration and development, accurate detection of drilling fluid performance parameters is a key link to ensure the safe and efficient conduct of drilling operations. Parameters such as viscosity and density of drilling fluid are directly related to downhole pressure balance, cuttings carrying capacity, and wellbore stability. The accuracy of the detection data is crucial for optimizing drilling processes and preventing downhole accidents (such as blowouts and well collapses).

[0003] Currently, sampling buckets are commonly used as drilling fluid sampling tools in oilfields. While this method offers advantages such as ease of operation and low cost, it suffers from significant technical drawbacks. Because solid impurities such as cuttings and mud tend to settle at the bottom of the drilling fluid circulation tank, the sampling bucket easily mixes these deposited impurities into the sample during sampling. Furthermore, the open design of the sampling bucket allows external dust, oil, and other contaminants to easily enter during sampling, transfer, and emptying, further reducing sample purity. These problems prevent the obtained drilling fluid performance parameters from accurately reflecting the downhole fluid state, affecting not only the scientific adjustment of drilling fluid formulations but also potentially leading to engineering decision-making errors due to data distortion, increasing drilling operation risks and costs. Therefore, those skilled in the art have provided an oilfield drilling fluid sampling device to address the problems mentioned in the background section. Utility Model Content

[0004] The purpose of this invention is to provide an oilfield drilling fluid sampling device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] An oilfield drilling fluid sampling device, comprising:

[0007] The sampling cylinder is equipped with a built-in filter and a liquid level sensor, and a backflush mechanism. A drain pipe is installed on the sampling cylinder, and a control valve is installed on the drain pipe. Lifting rings are installed on both sides of the sampling cylinder.

[0008] A small hydrocyclone separator is mounted on a sampling cylinder. A first connecting pipe is connected to the sampling cylinder. The other end of the first connecting pipe is connected to a U-shaped pipe via a connecting assembly. The other end of the U-shaped pipe is connected to a second connecting pipe via a connecting assembly. The other end of the second connecting pipe is connected to the small hydrocyclone separator. A telescopic inlet pipe is connected to the small hydrocyclone separator. A water pump is installed on the first connecting pipe.

[0009] Preferably, the sampling tube has an inspection port, and an inspection door is installed at the inspection port by bolts.

[0010] Preferably, the sampling cylinder is provided with a mounting ring, and the mounting ring has a mounting groove, and the built-in filter screen is installed in the mounting groove by mounting bolts.

[0011] Preferably, an mounting block is installed inside the sampling tube, and an infrared photoelectric sensor is mounted on the mounting block.

[0012] Preferably, the backflush mechanism includes an air pump, an exhaust pipe, an exhaust ring, and several nozzles. The air pump is installed on the sampling cylinder, the exhaust ring is installed inside the sampling cylinder, one end of the exhaust pipe is connected to the air pump, and the other end of the exhaust pipe passes through the sampling cylinder and is connected to the exhaust ring. Several nozzles are installed on the exhaust ring.

[0013] Preferably, the connecting assembly includes a first flange, a second flange, and a sealing gasket. The first flange is connected to both ends of the U-shaped pipe, the second flange is connected to one end of the first connecting pipe and the second connecting pipe, and the sealing gasket is connected between the first flange and the second flange. The first flange and the second flange are connected by connecting bolts.

[0014] Preferably, a PLC controller is installed on the sampling cylinder, and the PLC controller is electrically connected to the liquid level sensor, control valve, small cyclone separator, infrared photoelectric sensor and air pump respectively.

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

[0016] 1. This utility model significantly improves sample purity by employing a dual filtration structure of a small hydrocyclone separator and a built-in filter. Drilling fluid enters the small hydrocyclone separator through a telescopic inlet pipe, where centrifugal force rapidly separates and discharges denser impurities such as rock cuttings and mud. The pre-filtered fluid then enters the sampling cylinder through a first connecting pipe, a U-shaped pipe, and a second connecting pipe. The built-in filter further intercepts fine particles, effectively preventing impurities from contaminating the sample. Compared to traditional sampling cylinders, this reduces the content of solid impurities in the sample, significantly improving the detection accuracy of parameters such as drilling fluid viscosity and density, and providing reliable data support for drilling engineering decisions.

[0017] 2. The liquid level sensor and backflushing mechanism equipped in this utility model work together to achieve intelligent automatic cleaning and maintenance. The liquid level sensor monitors the liquid level in the sampling cylinder in real time. When abnormal changes in liquid level are detected due to filter blockage, the backflushing mechanism is automatically triggered to backflush the filter with high-pressure gas or liquid, quickly removing impurities attached to the filter surface and avoiding the impact of filter blockage on sampling efficiency and quality. At the same time, the design of the drain pipe and control valve facilitates the rapid discharge of samples after sampling, reducing the risk of residual contamination and effectively solving the problems of easy contamination and difficult maintenance of traditional sampling devices. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of an oilfield drilling fluid sampling device according to an embodiment of this application;

[0019] Figure 2 This is a cross-sectional view of an oilfield drilling fluid sampling device according to an embodiment of this application;

[0020] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0021] In the diagram: 1. Sampling cylinder; 2. Built-in filter; 3. Liquid level sensor; 4. Drain pipe; 5. Control valve; 6. Lifting ring; 7. Miniature hydrocyclone separator; 8. First connecting pipe; 9. U-shaped pipe; 10. Second connecting pipe; 11. Telescopic inlet pipe; 12. Inspection port; 13. Inspection door; 14. Mounting ring; 15. Mounting groove; 16. Mounting bolt; 17. Mounting block; 18. Infrared photoelectric sensor; 19. Air pump; 20. Exhaust pipe; 21. Exhaust ring; 22. Nozzle; 23. First flange; 24. Second flange; 25. Sealing gasket; 26. Connecting bolt; 27. PLC controller; 28. Water pump. Detailed Implementation

[0022] 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.

[0023] Please see Figures 1-3 This utility model provides a technical solution:

[0024] An oilfield drilling fluid sampling device, comprising:

[0025] Sampling cylinder 1, with built-in filter screen 2 and liquid level sensor 3 installed inside the sampling cylinder 1, mounting ring 14 on the sampling cylinder 1, mounting groove 15 on the mounting ring 14, the built-in filter screen 2 is installed in the mounting groove 15 by mounting bolt 16, mounting block 17 is installed inside the sampling cylinder 1, and infrared photoelectric sensor 18 is installed on the mounting block 17.

[0026] An infrared photoelectric sensor 18 is mounted on the mounting block 17. It monitors the surface condition of the built-in filter 2 through an infrared transmitter-receiver pair. When impurities adhere to the filter surface, they will block the infrared light, causing a change in the signal strength at the receiving end. The PLC controller 27 integrates the data from the two sensors. If the liquid level fluctuates abnormally (such as rising too quickly) and the signal from the infrared photoelectric sensor 18 is below the threshold, it is determined that the filter is clogged.

[0027] A backflush mechanism is installed on the sampling cylinder 1. The backflush mechanism includes an air pump 19, an exhaust pipe 20, an exhaust ring 21, and several nozzles 22. The air pump 19 is installed on the sampling cylinder 1, the exhaust ring 21 is installed inside the sampling cylinder 1, one end of the exhaust pipe 20 is connected to the air pump 19, and the other end of the exhaust pipe 20 passes through the sampling cylinder 1 and is connected to the exhaust ring 21. Several nozzles 22 are installed on the exhaust ring 21, and the exhaust ring 21 is located below the built-in filter screen 2.

[0028] When the PLC controller determines that the filter screen is clogged, it immediately starts the backflushing mechanism. The air pump 19 starts working, and the high-pressure gas generated is delivered through the exhaust pipe 20 to the exhaust ring 21 installed in the sampling cylinder 1. Then, through several nozzles 22 on the exhaust ring 21, the gas impacts the filter screen surface in a high-speed airflow manner. The powerful airflow impact force quickly removes impurities from the filter screen pores and surface, restores the filter screen's filtration performance, and realizes automated maintenance of the device.

[0029] A drain pipe 4 is installed on the sampling cylinder 1, a control valve 5 is installed on the drain pipe 4, lifting rings 6 are installed on both sides of the sampling cylinder 1, an inspection port 12 is opened on the sampling cylinder 1, and an inspection door 13 is installed at the inspection port 12 by bolts.

[0030] Open the control valve 5 on the drain pipe 4 to transport the drilling fluid in the sampling cylinder 1 to the testing equipment for testing of performance parameters such as viscosity and density; when maintenance is required, the installation bolts 16 can be removed through the maintenance door 13 of the maintenance port 12 to replace or clean the built-in filter screen 2.

[0031] A small hydrocyclone separator 7 is installed on a sampling cylinder 1. A first connecting pipe 8 is connected to the sampling cylinder 1. The other end of the first connecting pipe 8 is connected to a U-shaped pipe 9 through a connecting assembly. The other end of the U-shaped pipe 9 is connected to a second connecting pipe 10 through a connecting assembly. The other end of the second connecting pipe 10 is connected to the small hydrocyclone separator 7. A telescopic liquid inlet pipe 11 is connected to the small hydrocyclone separator 7. A water pump 28 is installed on the first connecting pipe 8.

[0032] The device is hoisted to the designated position using the lifting rings 6 on both sides of the sampling cylinder 1, and the telescopic inlet pipe 11 is connected to the drilling fluid circulation system. The control valve 5 on the drain pipe 4 is opened, and the drilling fluid flows into the small hydrocyclone separator 7 through the telescopic inlet pipe 11. Under the action of centrifugal force, large particles of rock cuttings, mud, and other impurities are separated and discharged. The PLC controller 27 controls the water pump 28 to start, and the preliminarily purified drilling fluid enters the sampling cylinder 1 through the second connecting pipe 10, the U-shaped pipe 9, and the first connecting pipe 8. After secondary filtration through the built-in filter screen 2, the final pure drilling fluid is retained in the sampling cylinder 1. The control valve 5 is then closed to complete the sampling.

[0033] Furthermore, the connecting assembly includes a first flange 23, a second flange 24, and a sealing gasket 25. The first flange 23 is connected to both ends of the U-shaped pipe 9, the second flange 24 is connected to one end of the first connecting pipe 8 and the second connecting pipe 10 respectively, and the sealing gasket 25 is connected between the first flange 23 and the second flange 24. The first flange 23 and the second flange 24 are connected by connecting bolts 26.

[0034] The first flange 23 and the second flange 24 are tightly fixed together by connecting bolts 26. The sealing gasket 25 between them undergoes elastic deformation under the bolt tightening pressure, filling the tiny gap between the flanges and forming a reliable sealing layer. This effectively prevents drilling fluid from leaking at the pipeline connection and ensures the sealing and safety of the sampling process.

[0035] In the above embodiment, a PLC controller 27 is installed on the sampling cylinder 1. The PLC controller 27 is electrically connected to the liquid level sensor 3, the control valve 5, the small cyclone separator 7, the infrared photoelectric sensor 18, and the air pump 19.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An oilfield drilling fluid sampling device, characterized by, include: Sampling cylinder (1), the sampling cylinder (1) is equipped with a built-in filter screen (2) and a liquid level sensor (3), and a backflush mechanism is installed on the sampling cylinder (1). A drain pipe (4) is installed on the sampling cylinder (1), and a control valve (5) is installed on the drain pipe (4). Hanging rings (6) are installed on both sides of the sampling cylinder (1). A small hydrocyclone separator (7) is installed on a sampling cylinder (1). A first connecting pipe (8) is connected to the sampling cylinder (1). The other end of the first connecting pipe (8) is connected to a U-shaped pipe (9) through a connecting assembly. The other end of the U-shaped pipe (9) is connected to a second connecting pipe (10) through a connecting assembly. The other end of the second connecting pipe (10) is connected to the small hydrocyclone separator (7). A telescopic liquid inlet pipe (11) is connected to the small hydrocyclone separator (7). A water pump (28) is installed on the first connecting pipe (8).

2. An oilfield drilling fluid sampling device according to claim 1, characterised in that: The sampling tube (1) is provided with an inspection port (12), and an inspection door (13) is installed at the inspection port (12) by bolts.

3. The oilfield drilling fluid sampling device according to claim 1, characterized in that: The sampling tube (1) is provided with an installation ring (14), and the installation ring (14) is provided with an installation groove (15). The built-in filter (2) is installed in the installation groove (15) by an installation bolt (16).

4. The oilfield drilling fluid sampling device according to claim 1, characterized in that: An installation block (17) is installed inside the sampling tube (1), and an infrared photoelectric sensor (18) is installed on the installation block (17).

5. The oilfield drilling fluid sampling device according to claim 4, characterized in that: The backflush mechanism includes an air pump (19), an exhaust pipe (20), an exhaust ring (21), and several nozzles (22). The air pump (19) is installed on the sampling cylinder (1), the exhaust ring (21) is installed inside the sampling cylinder (1), one end of the exhaust pipe (20) is connected to the air pump (19), and the other end of the exhaust pipe (20) passes through the sampling cylinder (1) and is connected to the exhaust ring (21). Several nozzles (22) are installed on the exhaust ring (21).

6. The oilfield drilling fluid sampling device according to claim 1, characterized in that: The connecting assembly includes a first flange (23), a second flange (24), and a sealing gasket (25). The first flange (23) is connected to both ends of the U-shaped pipe (9). The second flange (24) is connected to one end of the first connecting pipe (8) and the second connecting pipe (10), respectively. The sealing gasket (25) is connected between the first flange (23) and the second flange (24). The first flange (23) and the second flange (24) are connected by connecting bolts (26).

7. The oilfield drilling fluid sampling device according to claim 5, characterized in that: The sampling tube (1) is equipped with a PLC controller (27), which is electrically connected to the liquid level sensor (3), control valve (5), small cyclone separator (7), infrared photoelectric sensor (18) and air pump (19).

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