Drilling fluid flow detection device for gas lift reverse circulation drilling process

Abstract

The utility model discloses a drilling fluid flow detection device for a gas lift reverse circulation drilling process, and relates to the technical field of gas lift reverse circulation flow detection, the drilling fluid flow detection device mainly comprises a separation device, a liquid circulation device and a detection device, the separation device is provided with a slurry inlet, and the slurry inlet is used for allowing drilling slurry to enter; wherein the separation device is used for removing gas and solid in drilling slurry, a slurry discharge port is formed in the separation device, the liquid circulation device is communicated with the slurry discharge port of the separation device and used for circulation of the drilling slurry with gas and solid removed, and the detection device is arranged on the liquid circulation device and used for detecting the flow of the drilling slurry. According to the drilling fluid flow detection device, gas and solid influencing drilling fluid flow detection used for the gas lift reverse circulation drilling technology are all discharged out of the device and then drilling fluid flow detection is carried out, so that the flow detection of upward-returning drilling fluid is accurate, and the detection precision is high.

Description

Technical Field

[0001] The utility model relates to the technical field of gas lift reverse circulation flow detection, in particular to a drilling fluid flow detection device used in a gas lift reverse circulation drilling process. Background Art

[0002] The gas lift reverse circulation drilling process needs to ensure that the liquid level in the borehole is maintained at a certain height, and the gas lift reverse circulation drilling process will continue to spray the drilling fluid in the borehole during the operation. Therefore, the amount of drilling fluid returned determines the height of the drilling fluid in the borehole. In order to accurately measure the amount of drilling fluid returned, a drilling fluid flow detection device for gas lift reverse circulation drilling process is needed, which can accurately measure the drilling fluid returned in the gas lift reverse circulation drilling process.

[0003] Because the gas lift reverse circulation drilling process returns solid-gas-liquid three-phase flow, and neither gas nor solid will re-enter the borehole with the liquid, they are not included in the calculation of drilling fluid flow, so they need to be discharged and not calculated. However, existing devices directly pass drilling fluid containing gas and solid directly into the flow detection device for detection, resulting in inaccurate flow detection of the returned drilling fluid.

[0004] Patent CN101037940 discloses a drilling fluid outlet flow detection system, which is installed on the drilling fluid outlet pipeline on the drilling rig. When the drilling fluid circulates out of the well from the wellbore, it flows through the detection system, and the level meter measures the liquid level of the discharged fluid in the buffer tank. No exhaust and solid removal treatment is performed, resulting in the actual measured drilling fluid level flow including gas and solid, which ultimately leads to inaccurate drilling fluid flow detection.

[0005] Therefore, it is urgent to provide a drilling fluid flow detection device for gas lift reverse circulation drilling technology to solve the above problems existing in the prior art. Utility Model Content

[0006] The utility model aims to provide a drilling fluid flow detection device for gas lift reverse circulation drilling technology to solve the problems existing in the above-mentioned prior art, to make the flow detection of the returning drilling fluid accurate and to improve the flow detection accuracy.

[0007] To achieve the above purpose, the utility model provides the following solutions:

[0008] The utility model provides a drilling fluid flow detection device for gas lift reverse circulation drilling technology, comprising

[0009] A separation device, wherein the separation device is provided with a slurry inlet, and the slurry inlet is used for allowing drilling slurry to enter; wherein the separation device is used to remove gas and solids in the drilling slurry, and the separation device is provided with a slurry discharge port;

[0010] A liquid circulation device, the liquid circulation device is connected to the slurry discharge port of the separation device, and is used for circulating the drilling slurry after gas and solid are removed;

[0011] A detection device is arranged on the liquid circulation device and is used to detect the flow rate of the drilling slurry.

[0012] Preferably, the separation device comprises a pulp feed box, the pulp feed box is provided with the pulp feed port and the pulp discharge port, and the top of the pulp feed box is also provided with an exhaust hole for exhausting gas;

[0013] The separation device also includes a solid removal device, which is arranged below the slurry discharge port and is used to separate the solids.

[0014] Preferably, the slurry discharge port is an inverted cone structure.

[0015] Preferably, the solid removal device is a screen plate, and the screen plate is located below the slurry discharge port.

[0016] Preferably, the screen plate is arranged to be inclined to facilitate the discharge of solids in the drilling slurry.

[0017] Preferably, the liquid circulation device is a flow detection tank, and a buffer plate is arranged in the flow detection tank, and the buffer plate is used to provide a buffering effect for the drilling slurry.

[0018] Preferably, a plurality of the buffer plates are vertically arranged, and the plurality of the buffer plates are vertically staggered inside the flow detection tank and are detachably connected to the flow detection tank.

[0019] Preferably, the detection device comprises a flow meter and a liquid level meter, the liquid level meter is used to monitor the height of the drilling slurry in the liquid circulation device, and the flow meter is used to detect the flow rate of the returning drilling fluid.

[0020] Preferably, a control switch is further included, wherein the control switch is used to control the circulation and stop of the circulation of the drilling slurry and can adjust the circulation volume of the drilling slurry.

[0021] Preferably, the control switch is a ball valve, one end of which is connected to the liquid outlet of the liquid circulation device, and the other end of which is connected to the flow meter.

[0022] When the ball valve is closed, the liquid level meter is used to monitor the liquid level of the drilling fluid; when the ball valve is opened, the flow meter is used to detect the flow of the returning drilling fluid, and the liquid level meter is used to monitor the liquid level of the drilling fluid.

[0023] Compared with the prior art, the utility model has achieved the following technical effects:

[0024] The utility model is provided with a slurry inlet on the separation device, and the slurry inlet is used for allowing drilling slurry to enter; the separation device is used to remove gas and solid in the drilling slurry, and the separation device is provided with a slurry discharge port, a liquid circulation device is connected with the slurry discharge port of the separation device, and is used for circulation of the drilling slurry after the gas and solid are removed; the detection device is arranged on the liquid circulation device, and is used for detecting the flow rate of the drilling slurry; the utility model discharges all gas and solid that affect the drilling fluid flow rate detection used for the gas lift reverse circulation drilling process out of the device, and then performs the drilling fluid flow rate detection, so that the flow rate detection of the returning drilling fluid is accurate and the detection accuracy is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 This is a schematic structural diagram of a drilling fluid flow rate detection device for gas lift reverse circulation drilling technology in an embodiment of the utility model;

[0027] Figure 2 It is a left view of a drilling fluid flow detection device for gas lift reverse circulation drilling process in an embodiment of the utility model;

[0028] Figure 3 It is a top view of a drilling fluid flow detection device used in a gas lift reverse circulation drilling process in an embodiment of the utility model.

[0029] In the figure: 1- pulp inlet box; 2- flow detection tank; 3- pulp inlet; 4- pulp outlet; 5- exhaust hole; 6- sieve plate; 7- buffer plate; 8- liquid level meter; 9- ball valve; 10- flow meter. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] The utility model aims to provide a drilling fluid flow detection device for gas lift reverse circulation drilling technology to solve the problems existing in the prior art, to make the flow detection of the returning drilling fluid accurate and to improve the flow detection accuracy.

[0032] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0033] like Figure 1-Figure 3 As shown, the utility model provides a drilling fluid flow detection device for gas lift reverse circulation drilling process, including a separation device, a liquid circulation device and a detection device. The separation device is provided with a slurry inlet 3, and the slurry inlet 3 is used for allowing drilling slurry to enter; the separation device is used to remove gas and solids in the drilling slurry, and the separation device is provided with a slurry discharge port 4, the liquid circulation device is connected with the slurry discharge port 4 of the separation device, and is used for circulating the drilling slurry after the gas and solids are removed. The detection device is arranged on the liquid circulation device, and is used to detect the flow of the drilling slurry. In this embodiment, all the gas and solids that affect the drilling fluid flow detection are discharged from the device before the drilling fluid flow detection is performed, so that the flow detection of the returning drilling fluid is accurate and the detection accuracy is high.

[0034] In this embodiment, the separation device includes a slurry feed box 1, which is provided with a slurry feed port 3 and a slurry discharge port 4. The top of the slurry feed box 1 is also provided with an exhaust hole 5 for gas discharge. Since the gas density is relatively small, the gas can be discharged through the exhaust hole 5 above during the flow of drilling fluid, and there are preferably two exhaust holes 5. It should be noted that the exhaust hole 5 can also be set at other positions of the slurry feed box that are higher than the flow of drilling slurry, as long as the discharge of gas can be guaranteed, for example, it can be set at an upper position on the side of the slurry feed box 1, and the number of the exhaust holes can also be appropriately changed;

[0035] The separation device also includes a solid removal device, which is arranged below the slurry discharge port 4 and is used to separate the solids.

[0036] In this embodiment, the slurry discharge port 4 is an inverted cone structure, so that the drilling slurry can be completely discharged from the slurry discharge port 4 without any residue.

[0037] In this embodiment, the solid removal device includes a sieve plate 6, which is located below the slurry discharge port 4 and is inclined to facilitate the discharge of solids in the drilling slurry. The separated solids are directly discharged from the device through the inclined sieve plate 6, without the need for manual removal, thus saving manpower and material resources. It should be noted that the solid removal device can also use other devices, as long as it can separate the solids, such as gauze, filter paper, etc. The solid removal device does not necessarily have to be inclined, but can be set flat and a cleaning device can be set to remove the separated solids.

[0038] In this embodiment, the liquid circulation device includes a flow detection tank 2, and a buffer plate 7 is arranged in the flow detection tank 2. The buffer plate 7 is used to provide a buffering effect on the drilling slurry. Since the discharged liquid energy is relatively strong, in order to prevent it from affecting the flow meter measurement, a plurality of buffer plates 7 are added and arranged inside the flow detection tank 2 located in front of the flow meter 10 to buffer the drilling fluid, so that the detection of the flow meter 10 is more accurate.

[0039] In this embodiment, a plurality of buffer plates 7 are vertically arranged, and the plurality of buffer plates 7 are staggered up and down inside the flow detection tank 2 and are detachably connected to the flow detection tank 2. The buffer plates 7 can be disassembled to facilitate the later cleaning and maintenance of the flow detection tank 2.

[0040] In this embodiment, the detection device includes a flow meter 10 and a liquid level meter 8. The flow meter 10 is arranged at the rear part of the flow detection tank 2, that is, the drilling fluid first flows through the flow detection tank 2 and then flows through the flow meter 10. The upper and lower parts of the liquid level meter 8 are connected to the flow detection tank. Its principle is equivalent to the principle of a communicating vessel. The liquid level height in the flow detection tank 2 can be obtained by the liquid level meter 8, that is, the volume of the drilling fluid in the flow detection tank 2 can be roughly estimated. The liquid level meter 8 is used to monitor the position height of the drilling slurry in the liquid circulation device, and the flow meter 10 is used to detect the flow rate of the returned drilling fluid. Double detection and mutual verification provide guarantee for the accurate measurement of the drilling fluid flow rate.

[0041] In the present embodiment, a control switch is also included, which is used to control the circulation and stop of the circulation of the drilling slurry, and can adjust the circulation amount of the drilling slurry. The control switch is preferably a ball valve 9, one end of the ball valve 9 is connected to the liquid outlet of the liquid circulation device, and the other end is connected to the flow meter 10. When the ball valve 9 is not used or is used, it is closed, and the liquid level of the drilling fluid is monitored by the liquid level meter 8. According to the liquid level, the amount of the returned drilling fluid can be roughly observed and estimated; when working, the ball valve 9 is opened, and the flow rate of the returned drilling fluid is detected by the flow meter 10, and the flow rate of the returned drilling fluid can also be estimated by the drop in the liquid level height of the liquid level meter 8. At this time, the flow meter 10 can accurately measure the flow rate of the returned drilling fluid; in the present embodiment, the amount of the returned drilling fluid can be roughly estimated by the liquid level meter 8, and the amount of the returned drilling fluid can be accurately calculated by the flow meter 10. The two confirm each other, further ensuring the accurate detection of the drilling fluid flow rate.

[0042] It should be noted that other devices can also be used as the control switch. The use of a ball valve can ensure opening and closing while also controlling the flow rate, which is very convenient to use. When other devices are selected, ordinary switch devices can be selected, such as a gate valve.

[0043] The present invention uses specific examples to illustrate the principle and implementation of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A drilling fluid flow detection device for gas lift reverse circulation drilling process, characterized in that: include A separation device, wherein the separation device is provided with a slurry inlet, and the slurry inlet is used for allowing drilling slurry to enter; wherein the separation device is used to remove gas and solids in the drilling slurry, and the separation device is provided with a slurry discharge port; A liquid circulation device, the liquid circulation device is connected to the slurry discharge port of the separation device, and is used for circulating the drilling slurry after gas and solid are removed; A detection device is arranged on the liquid circulation device and is used to detect the flow rate of the drilling slurry.

2. The drilling fluid flow rate detection device for gas lift reverse circulation drilling process according to claim 1, characterized in that: The separation device comprises a pulp feed box, the pulp feed box is provided with the pulp feed port and the pulp discharge port, and the top of the pulp feed box is also provided with an exhaust hole for exhausting gas; The separation device also includes a solid removal device, which is arranged below the slurry discharge port and is used to separate the solids.

3. The drilling fluid flow rate detection device for gas lift reverse circulation drilling process according to claim 2 is characterized in that: The slurry discharge port is an inverted cone structure.

4. The drilling fluid flow rate detection device for gas lift reverse circulation drilling process according to claim 2 is characterized in that: The solid removal device is a screen plate, and the screen plate is located below the slurry discharge port.

5. The drilling fluid flow rate detection device for gas lift reverse circulation drilling process according to claim 4 is characterized in that: The screen plate is arranged at an inclination to facilitate the discharge of solids in the drilling slurry.

6. The drilling fluid flow rate detection device for gas lift reverse circulation drilling process according to claim 1, characterized in that: The liquid circulation device is a flow detection tank, and a buffer plate is arranged in the flow detection tank. The buffer plate is used to provide a buffering effect for the drilling slurry.

7. The drilling fluid flow rate detection device for gas lift reverse circulation drilling process according to claim 6 is characterized in that: A plurality of buffer plates are vertically arranged, and the plurality of buffer plates are staggered up and down inside the flow detection tank and are detachably connected to the flow detection tank.

8. The drilling fluid flow rate detection device for gas lift reverse circulation drilling process according to claim 1, characterized in that: The detection device comprises a flow meter and a liquid level meter. The liquid level meter is used to monitor the height of the drilling slurry in the liquid circulation device, and the flow meter is used to detect the flow rate of the returning drilling fluid.

9. The drilling fluid flow rate detection device for gas lift reverse circulation drilling process according to claim 8, characterized in that: It also includes a control switch, which is used to control the circulation and stop the circulation of the drilling slurry and can adjust the circulation volume of the drilling slurry.

10. The drilling fluid flow rate detection device for gas lift reverse circulation drilling process according to claim 9, characterized in that: The control switch is a ball valve, one end of which is connected to the liquid outlet of the liquid circulation device, and the other end of which is connected to the flow meter. When the ball valve is closed, the liquid level meter is used to monitor the liquid level of the drilling fluid; when the ball valve is opened, the flow meter is used to detect the flow of the returning drilling fluid, and the liquid level meter is used to monitor the liquid level of the drilling fluid.

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