A drilling fluid cooling piping system and method of controlling the same

Abstract

The application discloses a drilling fluid cooling pipeline system and a control method thereof, and belongs to the technical field of drilling fluid cooling pipeline systems. The drilling fluid cooling pipeline system comprises a water tank, a water pump I and a water pump II are connected to the water tank, the water pump I is connected to a cooling water tower group II through a plate heat exchanger I, the water pump II is connected to a cooling water tower group I through two parallel channels, the cooling water tower group I and the cooling water tower group II are connected through pipelines, a sand pump I and a sand pump II are connected in parallel at a mud inlet, and the outlets of the sand pump I and the sand pump II are connected to the hot medium outlet of a plate heat exchanger III and the hot medium inlet of the plate heat exchanger I through two parallel channels. Seamless switching is realized through pressure monitoring, the risk that drilling fluid is blocked to cause operation failure can be effectively reduced, and after operation is completed, back flushing is realized on the drilling fluid end pipeline through a back flushing function, the risk that the drilling fluid pipeline is scaled and blocked is prevented. The number of windmill motor operations of the cooling water tower is adjusted, one-key automatic control of the drilling fluid temperature is realized, and the whole device adopts a redundant design and has high reliability.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of oilfield drilling operation equipment, and relates to a drilling fluid cooling pipeline system and a control method based on the pipeline system. BACKGROUND

[0002] The drilling fluid cooling device has the characteristics of large drilling fluid density and high viscosity, and is prone to cause fouling or blockage of the plate heat exchanger or the closed cooling water tower during use, which greatly reduces the drilling fluid cooling effect and affects the construction effect. SUMMARY

[0003] The present application provides a drilling fluid cooling pipeline system, which solves the problem of fouling or blockage of the plate heat exchanger or the closed cooling water tower in the prior art.

[0004] The technical solution adopted by the present application is a drilling fluid cooling pipeline system, which comprises a water tank, a water pump I and a water pump II connected to the water tank, the water pump I being connected to a cooling water tower group II through a plate heat exchanger I, the water pump II being connected to a cooling water tower group I through two parallel channels, the cooling water tower group I and the cooling water tower group II being connected through a pipeline, a sand pump I and a sand pump II being connected in parallel at a mud inlet, and the outlets of the sand pump I and the sand pump II being connected to the hot medium outlet of a plate heat exchanger III and the hot medium inlet of the plate heat exchanger I through two parallel channels.

[0005] The present application has the following characteristics:

[0006] In the two parallel channels of the water pump II, one channel is connected to the cooling water tower group I through a water control and air control valve IV, a plate heat exchanger II and a water control and air control valve III, and the other channel is connected to the cooling water tower group I through a water control and air control valve II, a plate heat exchanger III and a water control and air control valve I, and the water pump I is connected to the plate heat exchanger II and the plate heat exchanger III.

[0007] The mud inlet is composed of three parallel channels, one channel passing through a filter I and an air control valve VI, one channel directly passing through a filter II, and one channel passing through a filter III and an air control valve VII.

[0008] The hot medium outlet of the plate heat exchanger I is divided into three channels, one channel returning to the front end of the air control valve I through an air control valve II, one channel returning to the rear end of an air control valve V through an air control valve III and an air control valve IV, and the other channel returning to the hot medium inlet of the plate heat exchanger II through an air control valve IX.

[0009] The hot medium outlet of the plate heat exchanger II is divided into two paths, one path is connected to the drilling fluid outlet flange end through the gas control valve X, and the other path is connected to the hot medium inlet of the plate heat exchanger III through the gas control valve XI, and the hot medium outlet of the plate heat exchanger III is connected to the gas control valve III and the gas control valve IV through the gas control valve XII-I.

[0010] A negative pressure sensor is installed at the inlet of the sand pump I and the sand pump II.

[0011] Two groups of cooling water tower groups are used in parallel operation mode, multiple independent fans are arranged, and the water temperature can be automatically controlled by independently controlling the fan motor of the cooling water tower group.

[0012] In addition, the application also provides a control method based on the above drilling fluid cooling system, the sand pump I, the water pump I, the water pump II, the cooling water tower group I and the cooling water tower group II are started first, then the water control gas control valve III and the water control gas control valve IV on the cooling water pipeline are opened, then the drilling fluid pipeline is opened, the gas control valve I, the gas control valve V, the gas control valve IX and the gas control valve X, and the drilling fluid is cooled by the plate heat exchanger I and the plate heat exchanger II and then returns to the drilling fluid circulating tank; the cooling water is heated by the plate heat exchanger I and the plate heat exchanger II, and then returns to the water inlet pipeline of the cooling water tower group I and the cooling water tower group II for cooling.

[0013] The sand pump and the filter of the application adopt a plurality of parallel operation modes, and among the three plate heat exchangers, a two-in-one standby operation mode is adopted, seamless switching is realized through pressure monitoring, the risk of drilling fluid blockage leading to operation failure can be effectively reduced, and after the operation is completed, backwashing function is realized to backwash the drilling fluid pipeline, prevent the risk of drilling fluid pipeline scaling and blockage, real-time detection of the drilling fluid temperature is realized through adjusting the number of cooling water tower fan motors, one-key automatic control of the drilling fluid temperature is realized, the whole device adopts redundant design, and the reliability is high. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of a drilling fluid cooling pipeline system.

[0015] In the diagram, 1. Water pump I, 2. Water pump II, 3. Plate heat exchanger I, 4. Pneumatic control valve I, 5. Pneumatic control valve II, 6. Pneumatic control valve III, 7. Pneumatic control valve IV, 8. Pneumatic control valve V, 9. Sand pump I, 10. Pneumatic control valve VI, 11. Filter I, 12. Filter II, 13. Filter III, 14. Pneumatic control valve VII; 15. Sand pump II, 16. Pneumatic control valve VIII, 17. Plate heat exchanger II, 18. Pneumatic control valve IX, 19. Pneumatic control valve X, 20. Pneumatic control valve XI, 21. Pneumatic control valve XII, 22. Pneumatic control valve XII-I, 23. Plate heat exchanger III, 24. Water-controlled pneumatic control valve I, 25. Water-controlled pneumatic control valve II, 26. Water-controlled pneumatic control valve III, 27. Water-controlled pneumatic control valve IV, 28. Cooling tower assembly I, 29. Cooling tower assembly II, 30. Water tank, 31. Negative pressure sensor. Detailed Implementation

[0016] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0017] The present invention provides a drilling fluid cooling pipeline system, such as... Figure 1 As shown. Water pump I1 and water pump II2 are connected to the water tank respectively. Water pump I1 returns directly to cooling tower group II29 through plate heat exchanger I3. Water pump II2 is divided into two paths: one path returns to cooling tower group I28 through water-controlled air-controlled valve IV27, plate heat exchanger II17 and water-controlled air-controlled valve III26; the other path returns to cooling tower group I28 through water-controlled air-controlled valve II25, plate heat exchanger III23 and water-controlled air-controlled valve I24. Cooling tower group I28 and cooling tower group II29 are connected in series by rigid pipes.

[0018] The outlets of sand pump I9 and sand pump II15 merge, while the inlet is divided into three parallel paths: one path passes through filter I11 and pneumatic control valve VI10; one path passes directly through filter II12; and one path passes through filter III13 and pneumatic control valve VII14.

[0019] The outlet of the sand pump is divided into two paths: one path is connected to the hot medium outlet of plate heat exchanger Ⅲ23 via pneumatic control valve VIII16; the other path is connected to the hot medium inlet of plate heat exchanger Ⅰ3 via pneumatic control valve V8 and pneumatic control valve Ⅰ4.

[0020] The heat medium outlet of plate heat exchanger I3 is divided into three paths: one path returns to the front end of pneumatic control valve I4 via pneumatic control valve II5; another path returns to the rear end of pneumatic control valve V8 via pneumatic control valve III6 and pneumatic control valve IV7; and the third path goes to the heat medium inlet of plate heat exchanger II17 via pneumatic control valve IX18.

[0021] The heat medium outlet of plate heat exchanger II17 is divided into two paths. One path is connected to the drilling fluid outlet flange via pneumatic control valve X19, and the other path is connected to the heat medium inlet of plate heat exchanger III23 via pneumatic control valve XI20. The heat medium outlet of plate heat exchanger III23 is connected to pneumatic control valve III6 and pneumatic control valve IV7 via pneumatic control valve XII-I22.

[0022] The entire cooling piping system is located near the drilling fluid circulation tank at the drilling site. A rigid pipe connects to the inlets of sand pumps I-9 and II-15 via circulation tank No. 2. The drilling fluid enters the sand pumps through filter II-12, and the cooled drilling fluid connects to the inlet of circulation tank No. 3 via the outlet of plate heat exchanger II-17, thus achieving cooling of the drilling fluid. Of the three inlet pipes for the sand pumps, only one is open during operation.

[0023] The control method based on this system is as follows: After the pipeline is connected, start sand pump I9, water pump I1, water pump II2, and one fan motor each for cooling tower group I28 and cooling tower group II29. Set the temperature value of the drilling fluid after cooling through the control box, and start operation with one button. Open the water control valve III26 and water control valve IV27 on the cooling water pipeline, and open the gas control valve I4, gas control valve V8, gas control valve IX18, and gas control valve X19 on the drilling fluid pipeline. The drilling fluid passes through plate heat exchanger I3 and... After being cooled by plate heat exchanger II17, the water returns to the drilling fluid circulation tank. After being heated by plate heat exchangers I3 and II17, the cooling water returns to the inlet pipes of cooling tower group I28 and cooling tower group II29 for cooling, thus starting the next cooling cycle. When the detected drilling fluid outlet temperature is higher than the set temperature, more of the fan motors of cooling tower group I28 and cooling tower group II29 will be automatically turned on until the drilling fluid outlet temperature is equal to the set temperature, at which point the system reaches equilibrium.

[0024] The system is equipped with differential pressure sensors for plate heat exchangers. When the differential pressure sensor of one of the plate heat exchangers exceeds the limit value, the program automatically activates the plate heat exchanger switching mode. For example, when the differential pressure value between the inlet and outlet of plate heat exchanger I3 reaches the limit value, the program automatically closes pneumatic control valve I4 and pneumatic control valve X19, and opens pneumatic control valves II5, XI20, XII-I22, water-controlled pneumatic control valve II25, and water-controlled pneumatic control valve I24; the speed regulation mode of water pump II2 is turned on to increase the discharge rate; at this time, the drilling fluid returns to the drilling fluid circulation tank after being cooled by plate heat exchangers II17 and III23; similarly, when the differential pressure value between the inlet and outlet of plate heat exchanger II17 reaches the limit value, the drilling fluid can return to the drilling fluid circulation tank after being cooled by plate heat exchangers I3 and III23.

[0025] A negative pressure sensor is installed at the sand pump inlet. When the negative pressure sensor exceeds the limit value, the air control valve VI10 is activated, and the drilling fluid enters the sand pump through the filter I11 and the air control valve VI10. If the negative pressure sensor exceeds the limit value again, the air control valve VII14 is activated, and the drilling fluid enters the sand pump through the filter III13 and the air control valve VII14.

[0026] The system has a built-in backflushing function. When the operation is completed, the program starts the one-button backflushing function, the water pump stops working, and the air control valves VIII16, XI16, IX18, I4, and IV6 open. Other air control valves for drilling fluid are closed, and the drilling fluid flows in reverse, returning to the drilling fluid circulation tank through air control valves VIII16, XI20, IX18, I4, and IV7, thus cleaning the drilling fluid channels in the plate heat exchanger.

[0027] The sand pump inlet is connected to circulation tank No. 2 via a rigid pipe. The cooled drilling fluid is connected to the inlet of circulation tank No. 3 via the heat medium outlet of the plate heat exchanger to achieve cooling of the drilling fluid.

[0028] The system employs a parallel operation mode with multiple sand pumps and filters connected in parallel, and a two-in-one-out plate heat exchanger configuration. This effectively reduces the risk of drilling fluid blockage leading to operational failure. The system also features a built-in backflushing function to backflush the drilling fluid pipeline, preventing scaling and blockage. The unit achieves one-button automated control of the drilling fluid temperature by adjusting the number of fan motors in the cooling tower and the operating frequency of the plate heat exchangers. The entire system utilizes a redundant design, ensuring high reliability.

Claims

1. A drilling fluid cooling pipeline system, characterized in that, Includes a water tank (30), on which water pump I (1) and water pump II (2) are connected. Water pump I (1) is connected to cooling tower group II (29) through plate heat exchanger I (3). Water pump II (2) is connected to cooling tower group I (28) through two parallel passages. Cooling tower group I (28) and cooling tower group II (29) are connected by pipelines. Sand pump I (9) and sand pump II (15) are connected in parallel at the mud inlet. The outlets of sand pump I (9) and sand pump II (15) are connected to the heat medium outlet of plate heat exchanger III (23) and the heat medium inlet of plate heat exchanger I (3) through two parallel passages. In the two parallel channels of the water pump II (2), one channel is connected to the cooling tower group I (28) through the water-controlled air-controlled valve IV (27), plate heat exchanger II1 (7) and water-controlled air-controlled valve III (26); the other channel is connected to the cooling tower group I (28) through the water-controlled air-controlled valve II (25), plate heat exchanger III (23) and water-controlled air-controlled valve I (24). The water pump II (2) is connected to the plate heat exchanger II (17) and the plate heat exchanger III (23). The mud inlet is composed of three parallel passages: one passage passes through filter I (11) and pneumatic valve VI (10); one passage passes directly through filter II (12); and one passage passes through filter III (13) and pneumatic valve VII (14). The heat medium outlet of the plate heat exchanger I (3) is divided into three paths: one path returns to the front end of the pneumatic control valve I (4) via the pneumatic control valve II (5); another path returns to the rear end of the pneumatic control valve V (8) via the pneumatic control valve III (6) and the pneumatic control valve IV (7); and the other path goes to the heat medium inlet of the plate heat exchanger II (17) via the pneumatic control valve IX (18). The heat medium outlet of the plate heat exchanger II (17) is divided into two paths. One path is connected to the drilling fluid outlet flange via the pneumatic control valve X (19), and the other path is connected to the heat medium inlet of the plate heat exchanger III (23) via the pneumatic control valve XI (20). The heat medium outlet of the plate heat exchanger III (23) is connected to the pneumatic control valve III (6) and the pneumatic control valve IV (7) via the pneumatic control valve XII-I (22).

2. The drilling fluid cooling pipeline system according to claim 1, characterized in that, Negative pressure sensors (31) are installed at the inlets of sand pump I (9) and sand pump II (15).

3. The drilling fluid cooling pipeline system according to claim 1, characterized in that, It adopts a parallel operation mode of two sets of cooling water towers and contains multiple independent fans.

4. The control method for a drilling fluid cooling pipeline system according to claim 1, characterized in that, First, start sand pump I (9), water pump I (1), water pump II (2), cooling tower group I (28) and cooling tower group II (29). Then, open the water control valve III (26) and water control valve IV (27) of the cooling water pipeline. Then, open the drilling fluid pipeline water control valve I (4), gas control valve V (8), gas control valve IX (18) and gas control valve X (19). The drilling fluid returns to the drilling fluid circulation tank after being cooled by plate heat exchanger I (3) and plate heat exchanger II (17). The cooling water returns to the inlet pipeline of cooling tower group I (28) and cooling tower group II (29) after being heated by plate heat exchanger I (3) and plate heat exchanger II (17).

Images