A quantitative degassed drilling fluid sampling device with self-cleaning function

Abstract

The present invention relates to a quantitative degassing drilling fluid sampling device with a self-cleaning function, comprising: a sampling head, on which a plurality of sampling holes are opened for sampling drilling fluid and filtering rock cuttings particles; a negative pressure sensing actuator, which is respectively connected to the sampling head and a cleaning cover, and can drive the cleaning cover to self-clean the sampling head; the cleaning cover can scrape off rock cuttings and mud and sand deposited on the sampling hole; when the sampling hole is blocked by rock cuttings and mud and sand, causing a negative pressure state in the sampling head, the negative pressure sensing actuator can drive the cleaning cover to clean the sampling hole through a pressure connector; when there is no obvious negative pressure in the sampling head, the negative pressure sensing actuator is reset through a built-in reset elastic element, completing a complete self-cleaning process of the sampling device. The present invention realizes the self-cleaning function of the quantitative degasser drilling fluid sampling device, prevents the problem of clogging of the sampling device caused by rock cuttings particles, mud and sand in the drilling fluid, has a simple structure, does not require frequent maintenance, and has high reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of geological logging engineering at oil drilling sites, and in particular to a drilling fluid sampling device, specifically a quantitative degassed drilling fluid sampling device with a self-cleaning function suitable for quantitative collection and processing of drilling fluid by a hose pump, a peristaltic pump, a self-priming pump, etc. Background Art

[0002] Gas logging is the core of oil and gas exploration logging at the drilling site. In order to improve the quantitative level of gas logging, degassing systems and devices with quantitative processing of drilling fluid have been launched and applied in recent years. The main principle is to use the working principle of the volumetric pump to achieve quantitative collection and processing of drilling fluid, thereby ensuring the quantitative analysis level of subsequent gas logging.

[0003] Existing quantitative degassing technologies mostly use filters as sampling devices for drilling fluids to prevent large particles of rock cuttings from entering the sampling pump and causing excessive wear or clogging of the pipeline. However, due to the size of the filter holes of the filter itself and the special properties of the drilling fluid as a non-Newtonian fluid, the filter is prone to rock cuttings and mud accumulation, which affects the collection of drilling fluid.

[0004] In order to improve this situation, the present invention proposes a quantitative degassing drilling fluid sampling device with a self-cleaning function. The self-cleaning function of the sampling hole of the sampling head is realized through the negative pressure condition in the sampling head, thereby solving the problem of blockage of the quantitative degasser sampling device, improving the field applicability and reliability of the quantitative degasser technology, and thus improving the quantitative level and quality of gas logging. Summary of the invention

[0005] The purpose of the present invention is to provide a quantitative degassing drilling fluid sampling device with a self-cleaning function, which can prevent the problem of clogging of the sampling device caused by rock cuttings particles, mud and sand in the drilling fluid, has a simple structure, does not require frequent maintenance, and has high reliability.

[0006] To achieve the above object, the present invention provides a quantitative degassed drilling fluid sampling device with a self-cleaning function, comprising:

[0007] A sampling head, wherein a plurality of sampling holes are provided on the sampling head for sampling drilling fluid and filtering rock cuttings particles;

[0008] A cleaning cover moves back and forth along the sampling head to scrape off rock debris, mud and sand accumulated on the sampling hole of the sampling head;

[0009] A negative pressure sensing actuator is connected to the cleaning cover. When the sampling hole is blocked by rock chips, mud and sand, causing a negative pressure state in the sampling head, the negative pressure sensing actuator can drive the cleaning cover to move back and forth along the sampling head to perform self-cleaning of the sampling head. When there is no obvious negative pressure in the sampling head, the negative pressure sensing actuator drives the cleaning cover to reset.

[0010] In a preferred embodiment of the present invention, the sampling head is connected to a drilling fluid sampling hose of the quantitative degasser.

[0011] In a preferred embodiment of the present invention, the sampling head is selected from a variety of shapes such as a cylindrical or square column, and the material can be a drilling fluid corrosion-resistant material such as metal and polymer.

[0012] In a preferred embodiment of the present invention, the sampling holes are in various shapes such as round or square, and the size is set according to the size of the adapted quantitative degasser hose pump. The inner diameter of the round sampling hole is generally 1 to 25.4 mm, and the side length of the square sampling hole is generally 1 to 25.4 mm.

[0013] In a preferred embodiment of the present invention, the negative pressure sensing actuator includes a pressure communicating device and a reset elastic element, the pressure communicating device includes a housing and a first piston, a pressure transmitting medium and a second piston arranged in a piston cavity of the housing, the pressure transmitting medium is located between the first piston and the second piston, the first piston is used to sense the negative pressure in the sampling head, and the second piston is connected to the cleaning cover; one end of the reset elastic element acts on the housing, and the other end acts on the first piston.

[0014] In a preferred embodiment of the present invention, the pressure transmission medium is liquid or gas.

[0015] In a preferred embodiment of the present invention, the force-bearing area of ​​the second piston and the force-bearing area of ​​the first piston are adapted according to actual conditions, and the ratio between the two is generally 1:1 to 1:5, which can ensure that there is sufficient execution force to drive the cleaning cover.

[0016] In a preferred embodiment of the present invention, the execution force of the cleaning cover is adjusted by adjusting the ratio between the force area of ​​the first piston and the force area of ​​the second piston of the pressure communicating vessel, and the execution force can generally be set at 0.05-0.1MPa (about 50-100N).

[0017] In a preferred embodiment of the present invention, the resetting elastic element is made of corrosion-resistant materials such as metal and polymer.

[0018] In a preferred embodiment of the present invention, the resetting elastic element is a spring, and the k value of the spring is adapted to the pressure communicating vessel to ensure that the cleaning cover can be pushed to reset when there is no negative pressure in the sampling head.

[0019] In a preferred embodiment of the present invention, the cleaning cover is formed by welding a plurality of reinforcing ribs and a plurality of scrapers in a grid shape.

[0020] In a preferred embodiment of the present invention, the reinforcing ribs and scrapers are both made of a metal material resistant to drilling fluid corrosion.

[0021] Due to the adoption of the above technical solution, the quantitative degassing drilling fluid sampling device with self-cleaning function of the present invention has a simple structure and high reliability. The cleaning cover scrapes and resets the accumulated rock debris and mud and sand on the sampling hole of the sampling head through the connecting vessel and spring of the negative pressure sensing actuator, thereby ensuring the stable operation of the quantitative degasser.

[0022] The present invention does not require an additional power source and a transmission device, simplifies the structure of the quantitative degasser, and facilitates on-site installation and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the operation of the negative pressure sensing actuator and the cleaning cover when the sampling head is in a negative pressure state in the present invention;

[0024] Figure 2 It is a schematic diagram of the operation of the negative pressure sensing actuator and the resetting of the cleaning cover when there is no obvious negative pressure in the sampling head of the present invention. DETAILED DESCRIPTION

[0025] The following combination Figure 1 and Figure 2 , the technical content, structural features, objectives achieved and effects of the present invention are described in detail through preferred embodiments.

[0026] like Figure 1 and Figure 2 As shown in FIG. 1 , a quantitative degassing drilling fluid sampling device with a self-cleaning function is provided by the present invention. Figure 1 and Figure 2 As shown, Figure 1 and Figure 2 The middle left half is a schematic diagram of the appearance of a quantitative degassing drilling fluid sampling device with a self-cleaning function; Figure 1 and Figure 2 The middle right half is a cross-sectional view of the internal structure of the device.

[0027] The quantitative degassing drilling fluid sampling device with a self-cleaning function provided by the present invention comprises a sampling head 1 , a pressure communicating vessel 21 and a cleaning cover 3 .

[0028] The sampling head 1 has a plurality of sampling holes 11 for sampling drilling fluid and filtering rock cuttings. The sampling head 1 is connected to the drilling fluid sampling hose of the quantitative degasser and can be cylindrical, square or other shapes, and made of metal, polymer or other drilling fluid corrosion resistant materials.

[0029] Furthermore, the sampling head 1 is provided with a plurality of sampling holes 11, which may be in various shapes such as cylindrical and square pillar shapes, and the size is generally 1 to 25.4 mm depending on the size of the adapted quantitative degasser hose pump, and the number varies.

[0030] In the preferred embodiment of the present invention, the sampling head 1 is made of stainless steel and is cylindrical in shape, so that its contact surface area with the drilling fluid is maximized, which is conducive to the collection of drilling fluid; the sampling holes on the sampling head 1 are circular, with a diameter of 4 mm, and are evenly distributed on the sampling head 1. Of course, the sampling holes 11 can also be square or other shapes, and the size is set according to the size of the adapted quantitative degasser hose pump. The side length of the square sampling hole is generally 1 to 25.4 mm.

[0031] The negative pressure sensing actuator 2 includes a pressure connector 21 and a reset elastic element 23. The pressure connector 21 includes a housing 21a and a first piston 21c, a pressure transmission medium 22 and a second piston 21d arranged in a piston chamber 21b of the housing 21a. The pressure transmission medium 22 is located between the first piston 21c and the second piston 21d. The first piston 21c is used to sense the negative pressure in the sampling head 1, and the second piston 21d is connected to the cleaning cover 3. One end of the reset elastic element 23 acts on the housing 21a, and the other end acts on the first piston 21c.

[0032] The pressure transmission medium 22 is liquid or gas. In a preferred embodiment of the present invention, the pressure communication device 21 is hydraulically operated, and the pressure transmission medium 22 is hydraulic oil.

[0033] The force area 21da of the second piston 21d and the force area 21ca of the first piston 21c are adapted according to actual conditions, and the ratio between the two is generally 1:1 to 1:5, which can ensure that there is sufficient execution force to drive the cleaning cover. The present invention can adjust the execution force of the cleaning cover 3 by adjusting the ratio between the force area 21ca of the first piston 21c of the pressure connector 21 and the force area 21da of the second piston 21d, and the execution force can generally be set at 0.05 to 0.1 MPa (about 50 to 100 N). In a preferred embodiment of the present invention, the ratio between the force area 21da of the second piston 21d and the force area 21ca of the first piston 21c is selected as 1:4 to ensure sufficient execution driving force.

[0034] In a preferred embodiment of the present invention, the resetting elastic element 23 is a mechanical spring, and the mechanical spring is made of corrosion-resistant materials such as metal and polymer. A more preferred solution is that the mechanical spring is made of stainless steel. The k value of the mechanical spring is adapted to the connecting vessel 21 to ensure that the cleaning cover 3 can be pushed to reset when there is no negative pressure in the sampling head 1.

[0035] The cleaning cover 3 is formed by welding a plurality of reinforcing ribs 31 and a plurality of scrapers 32 in a grid shape, and is connected to the second piston 21d in the negative pressure sensing actuator 2, and can scrape away the rock debris, mud and sand deposited on the sampling hole 11. In a preferred embodiment of the present invention, the reinforcing ribs 31 and the scrapers 32 are both made of a metal material resistant to drilling fluid corrosion, preferably made of stainless steel.

[0036] like Figure 1 As shown, when the sampling hole 11 is blocked by rock chips and mud and sand A, causing a negative pressure state in the sampling head 1, the first piston 21c in the negative pressure sensing actuator 2 senses the negative pressure and moves upward, compressing the pressure transmission medium 22. The compressed pressure transmission medium 22 drives the second piston 21d to move upward, so that the cleaning cover 3 can be driven to move upward through the second piston 21d in the pressure connector 21, and the sampling hole 11 is cleaned by the scraper 32 on the cleaning cover 3.

[0037] like Figure 2 As shown, when there is no obvious negative pressure in the sampling head 1, the negative pressure sensing actuator 2 drives the first piston 21c to move downward and reset through the built-in reset elastic element 23, and the pressure of the pressure transmission medium 22 is released. Under the action of external pressure, the second piston 21d also moves downward, driving the cleaning cover 3 to reset, completing a complete self-cleaning process of the sampling device.

[0038] In the present invention, the pressure communicating vessel 21 is a core component for realizing the self-cleaning function of the drilling fluid sampling device. The driving pressure is amplified through the communicating vessel amplification principle, and the cleaning cover 3 effectively performs the scraping and cleaning function of the sampling head 1.

[0039] like Figure 1 As shown, when the sampling hole 11 on the sampling head 1 is blocked by rock debris and mud, a negative pressure state is formed in the sampling head 1. Generally, the length of the hose of the hose pump is about 1m, and the length of the hose connecting the hose pump and the sampling head 1 is about 2-3m. From this, it can be calculated that the internal negative pressure of the sampling head 1 is about -0.025MPa. The pressure amplified by the pressure connector 21 can reach 0.05-0.1MPa (about 50-100N execution force), which can drive the cleaning cover 3 to scrape off the rock debris and mud deposited on the sampling hole 11.

[0040] like Figure 2As shown, after the cleaning cover 3 scrapes away the rock debris and mud in the sampling hole 11, the drilling fluid can smoothly enter the sampling head 1, and there is no obvious negative pressure in the sampling head 1. The compressed elastic reset element 23 stretches and resets, driving the cleaning cover 3 to reset, completing a self-cleaning process of the sampling device.

[0041] In summary, the quantitative degasser drilling fluid sampling device with self-cleaning function described in the present invention has a simple structure, high reliability, adopts a new sampling device cleaning method, and is convenient for installation and on-site maintenance.

[0042] The present invention can realize the self-cleaning of the drilling fluid sampling device without the need for an additional power source and a transmission device, greatly reduces the work intensity of on-site personnel, and improves the working stability and reliability of the quantitative degasser.

[0043] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be considered as a limitation of the present invention. After reading the above content, it will be apparent to those skilled in the art that various modifications and substitutions of the present invention will occur. Therefore, the protection scope of the present invention should be limited by the appended claims.

Claims

1. A quantitative degassed drilling fluid sampling device with self-cleaning function, It is characterized in that Include: The sampling head has multiple sampling holes for sampling drilling fluid and filtering cuttings particles; A cleaning cover moves back and forth along the sampling head to scrape off rock debris, mud and sand accumulated on the sampling hole of the sampling head; A negative pressure sensing actuator, which is connected to the cleaning cover. When the sampling hole is blocked by rock chips, mud and sand, causing a negative pressure state in the sampling head, the negative pressure sensing actuator can drive the cleaning cover to move back and forth along the sampling head to perform self-cleaning of the sampling head. When there is no obvious negative pressure in the sampling head, the negative pressure sensing actuator drives the cleaning cover to reset; The negative pressure sensing actuator includes a pressure connector and a reset elastic element. The pressure connector includes a shell and a first piston, a pressure transmission medium and a second piston arranged in a piston cavity of the shell. The pressure transmission medium is located between the first piston and the second piston. The first piston is used to sense the negative pressure in the sampling head. The second piston is connected to the cleaning cover. One end of the reset elastic element acts on the shell, and the other end acts on the first piston.

2. A quantitative degassing drilling fluid sampling device with self-cleaning function as claimed in claim 1, It is characterized in that The sampling head is connected to the drilling fluid sampling hose of the quantitative degasser.

3. A quantitative degassing drilling fluid sampling device with self-cleaning function as claimed in claim 1, It is characterized in that The sampling head is selected from a cylindrical or square column shape; the sampling hole is circular or square.

4. A quantitative degassing drilling fluid sampling device with self-cleaning function as claimed in claim 1, It is characterized in that The sampling head is made of a material resistant to drilling fluid corrosion.

5. A quantitative degassing drilling fluid sampling device with self-cleaning function as claimed in claim 1, It is characterized in that The pressure transmission medium is liquid or gas.

6. A quantitative degassed drilling fluid sampling device with a self-cleaning function as claimed in claim 1, It is characterized in that The ratio of the force bearing area of ​​the second piston to the force bearing area of ​​the first piston is 1:1 to 1:

5.

7. A quantitative degassed drilling fluid sampling device with a self-cleaning function as claimed in claim 1, It is characterized in that The resetting elastic element is a spring, and the k value of the spring is adapted to the pressure communicating vessel to ensure that the cleaning cover can be pushed to reset when there is no negative pressure in the sampling head.

8. A quantitative degassed drilling fluid sampling device with a self-cleaning function as claimed in claim 1, It is characterized in that The cleaning cover is formed by welding a plurality of reinforcing ribs and a plurality of scrapers in a grid shape.

9. A quantitative degassed drilling fluid sampling device with a self-cleaning function as claimed in claim 8, It is characterized in that The reinforcing ribs and scrapers are both made of metal material resistant to drilling fluid corrosion.

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