Apparatus for treating drilling fluid and method for treating drilling fluid

Abstract

The present application belongs to the field of oil and gas drilling engineering, and specifically discloses a device for treating drilling fluid. The device comprises a shell, a centrifugal assembly arranged in the shell, the centrifugal assembly comprising a first centrifuge and a second centrifuge, and a channel assembly comprising a first channel, a second channel in communication with the second centrifuge, and a third channel in communication with the second centrifuge and an outlet of the shell. The channel assembly is configured to cause the separated drilling fluid flowing out of the first channel to form a split flow, wherein a part of the drilling fluid is transported to the second centrifuge through the second channel for re-separation, and a part of the drilling fluid flows to the outside of the shell through the third channel. The present application can adjust the processing capacity of the first centrifuge and the second centrifuge on the drilling fluid, so that the work of the device for treating drilling fluid can be more smooth, and the overall processing efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of oil and gas drilling engineering, and in particular to a device for treating drilling fluid and a method for treating drilling fluid. BACKGROUND

[0002] In order to adapt to different strata, barite needs to be added in the drilling process to increase the density of the drilling fluid, so as to improve the working efficiency of drilling. However, the drilling fluid after being discharged from the well will contain barite, rock debris, poor solid phase and other substances. In the prior art, although barite, rock debris, poor solid phase and other substances can be separated, the entire device is usually large in size, large in floor area, and complex in operation and installation, which requires more labor costs. SUMMARY

[0003] The purpose of the present application is to provide a device for treating drilling fluid, which controls the flow rate of drilling fluid flowing back to the first centrifuge through the fourth channel by the second valve, so as to match the processing capacity of the first centrifuge with the processing capacity of the second centrifuge.

[0004] According to a first aspect of the present application, there is provided a device for treating drilling fluid, comprising a housing; a centrifugal assembly arranged in the housing, the centrifugal assembly comprising a first centrifuge in communication with an inlet of the housing and used for receiving drilling fluid containing impurities, and a second centrifuge; and a channel assembly comprising a first channel used for receiving separated drilling fluid from the first centrifuge, a second channel in communication with the second centrifuge, and a third channel in communication with the second centrifuge and an outlet of the housing, wherein the channel assembly is configured to cause the separated drilling fluid flowing out of the first channel to form a split flow, wherein a part of the drilling fluid is transported to the second centrifuge through the second channel for re-separation, and a part of the drilling fluid flows to the outside of the housing through the third channel.

[0005] In one embodiment, a first sensor is arranged on the first channel, the third channel comprises a first valve, the first sensor is configured to be able to monitor the flow rate and density of the separated drilling fluid in the first channel in real time and issue an instruction according to the measured value; and the first valve is configured to be able to act on the third channel in response to the instruction of the first sensor, so as to control the flow rate of the drilling fluid discharged to the outside of the housing.

[0006] In one embodiment, the rotational speed of the first centrifuge is lower than that of the second centrifuge.

[0007] In one embodiment, the channel assembly further comprises a fourth channel, one end of which is in communication with the first channel and the other end of which is in communication with the first centrifuge, so that a part of the separated drilling fluid in the first channel can be backflowed into the first centrifuge through the fourth channel.

[0008] In one embodiment, the second centrifuge is connected with an eighth channel in communication with the outlet, and a third sensor is arranged on the eighth channel, the third sensor being configured to monitor the flow rate and density of the separated drilling fluid in the eighth channel in real time and issue instructions according to the measured values.

[0009] In one embodiment, the fourth channel comprises a second valve, the second valve being configured to act on the fourth channel in response to the instructions of the first sensor and the third sensor, so that a part of the drilling fluid in the first channel is backflowed into the first centrifuge through the fourth channel, thereby matching the processing capacity of the first centrifuge with that of the second centrifuge.

[0010] In one embodiment, the channel assembly further comprises a fifth channel in communication with the inlet, a sixth channel in communication with the first centrifuge, and a seventh channel in communication with the outlet, wherein the fifth channel, the sixth channel and the seventh channel form an intersection.

[0011] In one embodiment, a second sensor is arranged on the fifth channel; a third valve is arranged inside the sixth channel; and a fourth valve is arranged inside the seventh channel, the second sensor being configured to monitor the flow rate and density of the drilling fluid in the fifth channel in real time and issue instructions according to the measured values, so as to act on the third valve to transport the drilling fluid containing impurities to the first centrifuge through the sixth channel, or act on the fourth valve to transport the drilling fluid to the outside of the housing through the seventh channel.

[0012] In one embodiment, the first centrifuge and the second centrifuge are respectively connected with a first recovery tank and a second recovery tank for receiving the separated solids.

[0013] According to a second aspect of the present application, a method for treating drilling fluid is provided, which is performed using the device for treating drilling fluid as described above, and comprises the following steps: S1, measuring and determining a first density value and a first displacement value of the drilling fluid by the second sensor; S2, when the first density value and the first displacement value are respectively lower than a first density threshold value and a first displacement threshold value, the third valve is closed, the fourth valve is opened, and the drilling fluid flows to the outside of the shell through the seventh channel; when the first density value and the first displacement value are respectively higher than the first density threshold value and the first displacement threshold value, the third valve is opened, the fourth valve is closed, and the drilling fluid flows to the first centrifuge through the sixth channel; S3, measuring and determining a second density value and a second displacement value of the separated drilling fluid from the first centrifuge by the first sensor; S4, when the second density value and the second displacement value are respectively lower than a second density threshold value and a second displacement threshold value, the first valve is opened, and the separated drilling fluid flows to the outside of the shell through the third channel; when the second density value and the second displacement value are respectively higher than the second density threshold value and the second displacement threshold value, the separated drilling fluid flows to the second centrifuge for re-separation through the second channel; S5, measuring a third density value and a third displacement value of the separated drilling fluid from the second centrifuge by the third sensor; S6, the separated drilling fluid finally flows to the outside of the shell through the eighth channel.

[0014] In one embodiment, the method further comprises an adjusting step of comparing the second displacement value and the third displacement value, adjusting the flow rate of the drilling fluid flowing into the second centrifuge by adjusting the opening degree of the second valve, so as to match the processing capacity of the first centrifuge and the second centrifuge. BRIEF DESCRIPTION OF DRAWINGS

[0015] The present application will be described in detail below with reference to the accompanying drawings, in which:

[0016] Figure 1 The structure of the device for treating drilling fluid according to the present application is schematically shown.

[0017] In the drawings, the same components are designated by the same reference numerals. The drawings are not drawn according to the actual proportions. DETAILED DESCRIPTION

[0018] The present application will be described in detail below with reference to the accompanying drawings, in which:

[0019] Figure 1 The structure of the device for treating drilling fluid according to the present application is schematically shown. As shown in the drawings, the device for treating drilling fluid according to the present application comprises a shell 1, a first centrifuge 2, a second centrifuge 3, a first sensor 4, a second sensor 5, a third sensor 6, a first valve 7, a second valve 8, a third valve 9, a fourth valve 10, a fifth valve 11, a sixth valve 12, a seventh valve 13, an eighth valve 14, a first channel 15, a second channel 16, a third channel 17, a fourth channel 18, a fifth channel 19, a sixth channel 20, a seventh channel 21, and an eighth channel 22. Figure 1As shown, according to the first aspect of the present application, a device 100 for treating drilling fluid mainly comprises a housing 10, a centrifugal assembly 20 and a channel assembly 30. Among them, the housing 10 is configured as a skid-mounted shell. The housing 10 can be integrally carried, thereby facilitating the relocation, stacking and installation of the device 100 for treating drilling fluid at the drilling site. The centrifugal assembly 20 is arranged inside the housing 10, which is used to separate the barite and cuttings and other fixed body waste in the drilling fluid, thereby improving the performance of the drilling fluid. The channel assembly 30 is arranged inside the housing 10, which is used to transport the drilling fluid to the centrifugal assembly 20 in different ways, and discharge the separated drilling fluid out of the housing 10.

[0020] According to the present application, as Figure 1 shown, the housing 10 comprises an inlet 1 and an outlet 2. The inlet 1 of the housing 10 is communicated with the centrifugal assembly 20 through the channel assembly 30, so as to transport the drilling fluid containing impurities into the centrifugal assembly 20 for separation. The outlet 2 of the housing 10 is communicated with the centrifugal assembly 20 through the channel assembly 30, so as to discharge the separated drilling fluid out of the housing 10.

[0021] According to the present application, as Figure 1 shown, the centrifugal assembly 20 comprises a first centrifuge 21 and a second centrifuge 22. Among them, the first centrifuge 21 is communicated with the inlet 1 of the housing 10 through the channel assembly 30, so that the first centrifuge 21 can receive the drilling fluid containing impurities. The second centrifuge 22 is communicated with the outlet 2 of the housing 10 through the channel assembly 30, so that the second centrifuge 22 can discharge the separated drilling fluid out of the housing 10.

[0022] According to the present application, as Figure 1 shown, the channel assembly 30 comprises a first channel 31, a second channel 32, and a third channel 33. Among them, the first channel 31 is communicated with the first centrifuge 21, which is used to transport the separated drilling fluid of the first centrifuge 21. The second channel 32 is communicated with the second centrifuge 22, which is used to transport the drilling fluid to the second centrifuge 22. The third channel 33 is communicated with the outlet 2 of the housing 10, which is used to discharge the drilling fluid out of the housing 10. In an embodiment of the present application, a junction point is formed between the first channel 31, the second channel 32 and the third channel 33, so that the separated drilling fluid passing through the first channel 31 can be divided into two parts, one part of the drilling fluid is transported into the second centrifuge 22 through the second channel 32 for further separation; and the other part of the drilling fluid flows out of the housing 10 through the third channel 33.

[0023] According to the present application, the first centrifuge 21 has a lower rotating speed controlled by the first motor 211, thereby separating barite from the drilling fluid. The second centrifuge 22 has a higher rotating speed controlled by the second motor 221, thereby separating solid waste such as cuttings from the drilling fluid. As a result, the processing capacity of the first centrifuge 21 is greater than that of the second centrifuge 22.

[0024] In one embodiment of the present application, the first channel 31 is provided with a first sensor 311. The first sensor 311 includes but is not limited to a density sensor and a flow rate sensor. The first sensor 311 is used to detect the density and flow rate of the separated drilling fluid in the first channel 31 in real time, and can measure the second density value and the second flow rate value of the drilling fluid.

[0025] According to the present application, as shown in Figure 1 The channel assembly 30 further includes an eighth channel 38. The eighth channel 38 can communicate the outlet 2 of the housing 10 with the second centrifuge 22. In addition, the eighth channel 38 is provided with a third sensor 381. The third sensor 381 includes but is not limited to a density sensor and a flow rate sensor. The third sensor 381 is used to detect the density and flow rate of the separated drilling fluid in the eighth channel 38 in real time, and can measure the third density value and the third flow rate value of the drilling fluid.

[0026] According to the present application, as shown in Figure 1 The channel assembly 30 further includes a fourth channel 34. One end of the fourth channel 34 communicates with the first channel 31, and the other end communicates with the first centrifuge 21, for returning the separated drilling fluid to the first centrifuge 21 for further separation. The fourth channel 34 is provided with a second valve 341. The second valve 341 controls the opening and closing of the fourth channel 34, thereby more easily controlling the flow rate of the drilling fluid returned to the first centrifuge 21.

[0027] According to the present application, the second valve 341 adjusts the opening of the third channel 33 by comparing the second flow rate value and the third flow rate value. That is, when the second flow rate value is greater than the third flow rate value, the second valve 341 needs to be opened at this time, so that part of the drilling fluid in the first channel 31 is returned to the first centrifuge 21 through the fourth channel 34, thereby reducing the flow rate of the drilling fluid flowing from the first channel 31 to the second centrifuge 22 through the second channel 32, and further matching the processing capacity of the first centrifuge 21 with that of the second centrifuge 22, effectively improving the working efficiency of the device 100 for processing the drilling fluid.

[0028] In one embodiment of the present application, the third channel 33 is provided with a first valve 331. The first valve 33 controls the flow rate of the drilling fluid flowing to the outside of the housing 10 by controlling the opening and closing of the third channel 33.

[0029] According to the present application, the first valve 331 can send a command to the first valve 331 according to the measured second density value and the second displacement value of the drilling fluid, so as to control the opening and closing of the first valve 331 to adjust the flow rate of the drilling fluid flowing to the outside of the housing 10. Specifically, when the second density value and the second displacement value are lower than the second density threshold value and the second displacement threshold value respectively, the first valve 331 is opened, and the separated drilling fluid directly flows to the outside of the housing 10 through the second passage 32. When the second density value and the second displacement value are higher than the second density threshold value and the second displacement threshold value respectively, the first valve 331 is closed, and the separated drilling fluid flows to the second centrifuge 22 through the second passage 32 and is separated again.

[0030] According to the present application, as shown in Figure 1 The passage assembly 30 further comprises a fifth passage 35, a sixth passage 36, and a seventh passage 37. The fifth passage 35 is in communication with the inlet 1 of the housing 10; the sixth passage 36 is in communication with the first centrifuge 21; and the seventh passage 37 is in communication with the outlet 2 of the housing 10. In addition, an intersection 39 is formed between the fifth passage 35, the sixth passage 36, and the seventh passage 37. The drilling fluid is split through the intersection 39, a part of the drilling fluid flows to the first centrifuge 21 through the sixth passage 36, and a part of the drilling fluid flows to the outside of the housing 10 through the seventh passage 37 and the outlet 2. The functions will be described in detail below.

[0031] In an embodiment of the present application, the fifth passage 35 is provided with a second sensor 351. The second sensor 351 includes but is not limited to a density sensor and a displacement sensor. The second sensor 351 is used to detect the density and displacement of the drilling fluid in the fifth passage 35 in real time, and can measure the first density value and the first displacement value of the drilling fluid.

[0032] In an embodiment of the present application, a third valve 361 is arranged on the sixth passage 36. The third valve 361 controls the flow rate of the drilling fluid flowing to the first centrifuge 21 by controlling the opening and closing of the sixth passage 36.

[0033] In an embodiment of the present application, a fourth valve 371 is arranged on the seventh passage 37. The fourth valve 371 controls the flow rate of the drilling fluid flowing to the outside of the housing 10 by controlling the opening and closing of the seventh passage 37.

[0034] According to the present application, the second sensor 351 can send a command to the third valve 361 or the fourth valve 371 according to the measured first density value and the first displacement value of the drilling fluid. Specifically, when the first density value and the first displacement value are respectively higher than the first density threshold value and the first displacement threshold value, the third valve 361 is opened, the fourth valve 371 is closed, and the drilling fluid flows to the first centrifuge 21 through the sixth channel 36. When the first density value and the first displacement value are respectively lower than the first density threshold value and the first displacement threshold value, the third valve 361 is closed, the fourth valve 371 is opened, and the drilling fluid flows to the outside of the housing 10 through the seventh channel 37.

[0035] In an embodiment of the present application, the first centrifuge 21 is externally provided with a first recovery tank 40. The second centrifuge 22 is externally provided with a second recovery tank 41. The first recovery tank 40 and the second recovery tank 41 are both used to receive the solid substances separated from the drilling fluid, such as barite, cuttings, etc.

[0036] In an embodiment of the present application, the first centrifuge 21 is provided with a first rotation speed sensor 212 between the first centrifuge 21 and the first motor 211, which is used to measure the rotation speed of the first centrifuge 21 in real time. The second centrifuge 22 is provided with a second rotation speed sensor 222 between the second centrifuge 22 and the second motor 221, which is used to measure the rotation speed of the second centrifuge 22 in real time. This is well known to those skilled in the art, and thus will not be described in detail.

[0037] According to the second aspect of the present application, a method for processing drilling fluid is provided, which is performed by the device 100 for processing drilling fluid, and includes the following steps:

[0038] S1, measuring the first density value and the first displacement value of the drilling fluid in the fifth channel 35 by the second sensor 351.

[0039] S2, determining whether the drilling fluid needs to be processed according to the first density value and the first displacement value.

[0040] When the first density value and the first displacement value are respectively less than the first density threshold value and the first displacement threshold value, the drilling fluid does not need to be processed, the third valve 361 is closed, the fourth valve 371 is opened, and the drilling fluid directly flows to the outside of the housing 10 through the seventh channel 37.

[0041] When the first density value and the first displacement value are respectively greater than the first density threshold value and the first displacement threshold value, the drilling fluid needs to be processed, the third valve 361 is opened, the fourth valve 371 is closed, and the drilling fluid flows to the first centrifuge 21 for separation processing through the sixth channel 36.

[0042] S3, adjusting the rotation speed of the first centrifuge 21 to enter the working state by the first motor 211.

[0043] S4, measuring a second density value and a second displacement value of the drilling fluid separated from the first centrifuge 21 by the first sensor 311.

[0044] S5, judging whether the drilling fluid needs to be treated according to the second density value and the second displacement value.

[0045] When the second density value and the second displacement value are less than the second density threshold value and the second displacement threshold value respectively, the drilling fluid does not need to be treated, the first valve 331 is opened, and the separated drilling fluid flows to the outside of the shell 10 through the first channel 31 and the third channel 33 in turn.

[0046] When the second density value and the second displacement value are greater than the second density threshold value and the second displacement threshold value respectively, the drilling fluid needs to be treated, the first valve 331 is closed, and the separated drilling fluid flows to the second centrifuge 22 for re-separation treatment through the first channel 31 and the second channel 32 in turn.

[0047] S6, adjusting the rotating speed of the second centrifuge 22 by the second motor 221 so as to enter a working state.

[0048] S7, measuring a third density value and a third displacement value of the drilling fluid separated from the second centrifuge 22 by the third sensor 381, and meanwhile, the separated drilling fluid flows to the outside of the shell 10 through the eighth channel 38.

[0049] S8, comparing the second displacement value and the third displacement value, adjusting the flow of the drilling fluid flowing into the second centrifuge 22 by adjusting the opening degree of the second valve 341, so as to match the processing capacity of the first centrifuge 21 and the second centrifuge 22.

[0050] That is to say, when the second displacement value is less than or equal to the third displacement value, the processing capacity of the first centrifuge 21 and the second centrifuge 22 is matched, and the opening degree of the second valve 341 needs to be kept at this time. When the second displacement value is greater than the third displacement value, the opening degree of the second valve 341 needs to be increased, so that more separated drilling fluid flows back to the first centrifuge 21 through the fourth channel 34. In this way, the flow of the drilling fluid flowing from the first centrifuge 21 to the second centrifuge 22 is always less than or equal to the maximum receiving amount of the second centrifuge 22, so that the device 100 for treating the drilling fluid is more smooth and efficient in the working process.

[0051] The application adjusts the processing capacity of the first centrifuge 21 and the second centrifuge 22 for the drilling fluid by controlling the flow of the drilling fluid flowing back to the first centrifuge 21 through the fourth channel 34 by the second valve 341, so that the working of the device 100 for treating the drilling fluid is more smooth, and the overall processing efficiency is improved.

[0052] The above merely describes the preferred embodiments of the present application, but the protection scope of the present application is not limited thereto. Those skilled in the art can easily make changes or modifications within the scope of the present application, and such changes or modifications shall be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A device (100) for treating drilling fluid, comprising: a housing (10); a centrifugal assembly (20) disposed in the housing (10), the centrifugal assembly (20) comprising a first centrifuge (21) in communication with an inlet (1) of the housing (10) and configured to receive drilling fluid containing impurities, and a second centrifuge (22); and a channel assembly (30) comprising a first channel (31) configured to receive separated drilling fluid from the first centrifuge (21), a second channel (32) in communication with the second centrifuge (22), and a third channel (33) in communication with the second centrifuge (22) and an outlet (2) of the housing (10), wherein the channel assembly (30) is configured to cause the separated drilling fluid flowing from the first channel (31) to split, wherein a portion of the drilling fluid is transported to the second centrifuge (22) for further separation through the second channel (32), and a portion of the drilling fluid flows to the outside of the housing (10) through the third channel (33), the channel assembly (30) further comprising a fourth channel (34) having one end in communication with the first channel (31) and the other end in communication with the first centrifuge (21), such that a portion of the separated drilling fluid in the first channel (31) can flow back to the first centrifuge (21) through the fourth channel (34), thereby reducing the flow rate of the drilling fluid flowing from the first channel (31) to the second centrifuge (22) through the second channel (32).

2. The apparatus for treating a drilling fluid of claim 1, wherein, a first sensor (311) is disposed on the first channel (31), the third channel (33) comprises a first valve (331), the first sensor (311) is configured to monitor the flow rate and density of the separated drilling fluid in the first channel (31) in real time and issue an instruction according to the measured value; the first valve (331) is configured to act on the third channel (33) in response to the instruction of the first sensor (311), thereby controlling the flow rate of the drilling fluid discharged to the outside of the housing (10).

3. The apparatus for treating a drilling fluid of claim 2, wherein, The rotational speed of the first centrifuge (21) is lower than that of the second centrifuge (22).

4. The apparatus for treating a drilling fluid of claim 3, wherein, The second centrifuge (22) is connected with an eighth channel (38) in communication with the outlet (2), the eighth channel (38) is provided with a third sensor (381), the third sensor (381) is configured to monitor the flow rate and density of the separated drilling fluid in the eighth channel (38) in real time and issue an instruction according to the measured value.

5. The apparatus for treating a drilling fluid of claim 4, wherein, the fourth channel (34) comprises a second valve (341), The second valve (341) is configured to act on the fourth channel (34) in response to the instructions of the first sensor (311) and the third sensor (381), so that part of the drilling fluid in the first channel (31) flows back to the first centrifuge (21) through the fourth channel (34), and the processing capacity of the first centrifuge (21) matches that of the second centrifuge (22).

6. The apparatus for treating a drilling fluid of claim 5, wherein, The channel assembly (30) further comprises a fifth channel (35) in communication with the inlet (1), a sixth channel (36) in communication with the first centrifuge (21), and a seventh channel (37) in communication with the outlet (2), wherein the fifth channel (35), the sixth channel (36) and the seventh channel (37) form an intersection (39).

7. The apparatus for treating a drilling fluid of claim 6, wherein, The fifth channel (35) is provided with a second sensor (351); the inside of the sixth channel (36) is provided with a third valve (361); the inside of the seventh channel (37) is provided with a fourth valve (371), The second sensor (351) is configured to monitor the flow rate and density of the drilling fluid in the fifth channel (35) in real time and issue instructions according to the measured values, so as to act on the third valve (361) to deliver the drilling fluid containing impurities to the first centrifuge (21) through the sixth channel (36), or act on the fourth valve (371) to deliver the drilling fluid to the outside of the housing (10) through the seventh channel (37).

8. The apparatus for treating a drilling fluid of claim 7, wherein, The first centrifuge (21) and the second centrifuge (22) are respectively connected with a first recovery tank (40) and a second recovery tank (41) for receiving the separated solids.

9. A method for processing drilling fluid, the method is performed using the device (100) for processing drilling fluid according to any one of claims 1 to 8, comprising the following steps: S1, measuring and judging the first density value and the first displacement value of the drilling fluid by the second sensor (351); S2, when the first density value and the first displacement value are respectively lower than the first density threshold value and the first displacement threshold value, the third valve (361) is closed, the fourth valve (371) is opened, the drilling fluid flows to the outside of the housing (10) through the seventh channel (37); when the first density value and the first displacement value are respectively higher than the first density threshold value and the first displacement threshold value, the third valve (361) is opened, the fourth valve (371) is closed, and the drilling fluid flows to the first centrifuge (21) through the sixth channel (36); S3, measuring and judging the second density value and the second displacement value of the separated drilling fluid from the first centrifuge (21) by the first sensor (311); S4, when the second density value and the second displacement value are respectively lower than the second density threshold value and the second displacement threshold value, the first valve (331) is opened, and the separated drilling fluid flows to the outside of the shell (10) through the third channel (33); when the second density value and the second displacement value are respectively higher than the second density threshold value and the second displacement threshold value, the separated drilling fluid flows to the second centrifuge (22) for re-separation through the second channel (32); S5, the third density value and the third displacement value of the separated drilling fluid from the second centrifuge (22) are measured by the third sensor (381); S6, the separated drilling fluid finally flows to the outside of the shell (10) through the eighth channel (38).

10. The method for treating a drilling fluid of claim 9, wherein, Further comprising an adjusting step: comparing the second displacement value and the third displacement value, adjusting the flow of the drilling fluid flowing into the second centrifuge (22) by adjusting the opening degree of the second valve (341), so that the processing capacity of the first centrifuge (21) and the second centrifuge (22) is matched.

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