Movable skid-mounted drilling fluid cooling device and drilling fluid circulating system

Abstract

The utility model discloses a movable skid-mounted drilling fluid cooling device and a drilling fluid circulating system. The movable skid-mounted drilling fluid cooling device comprises a skid-mounted box body and a drilling fluid cooling system arranged in the box body. When the temperature of the drilling fluid is lower than a set value, cooling water circulation is closed, when the temperature of the drilling fluid is higher than the set value, cooling water circulation is opened, and the opening number of the sand pumps, the opening number of the water pumps and the opening number of the plate heat exchangers can be independently controlled through valves. Therefore, the mode and the heat dissipation performance of the whole drilling fluid cooling system can be flexibly adjusted according to the cooling requirement of the drilling fluid, waste of resources is greatly reduced, and the cooling cost of the drilling fluid is reduced; in addition, the whole drilling fluid cooling system is integrally installed in a box body capable of being mounted in a skid-mounted mode, overall transportation and mounting are easy to achieve, the well site construction time is shortened, resource waste caused by dismounting is avoided, and the drilling fluid cooling cost is further reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of petroleum engineering machinery, in particular to a mobile skid-mounted drilling fluid cooling device and a drilling fluid circulation system. Background Art

[0002] Drilling fluid is a circulating fluid used in the drilling process of oil and natural gas extraction to meet the needs of drilling work with its multiple functions. Its main function is to carry rock cuttings from the bottom of the well to the ground, thereby ensuring the cleanliness of the bottom of the well and enabling the drill pipe to operate stably.

[0003] At present, in order to ensure the performance of drilling fluid, a drilling fluid cooling station is usually built at the well site. However, the existing drilling fluid cooling stations all adopt a fixed construction mode and need to be newly built at the well site. Not only does it have a certain construction period, but the drilling fluid cooling station needs to be dismantled after drilling is completed, which is a huge waste and leads to high costs for drilling fluid cooling.

[0004] In addition, the existing drilling fluid cooling station has a very single cooling mode for drilling fluid and cannot adjust the cooling mode according to the temperature of the drilling fluid. As a result, when the demand for drilling fluid cooling is not high, the entire drilling fluid cooling system can only be turned on at full power, resulting in a waste of resources and further leading to high costs for drilling fluid cooling.

[0005] Solving the above problems has become a top priority. Utility Model Content

[0006] In order to solve the technical problems that the drilling fluid cooling station in each well site needs to be rebuilt and demolished, causing huge waste, and the existing drilling fluid cooling station cannot adjust the cooling mode according to the temperature of the drilling fluid, resulting in waste of resources, the utility model provides a mobile skid-mounted drilling fluid cooling device and a drilling fluid circulation system.

[0007] The technical solution is as follows:

[0008] The first aspect of the present application relates to a mobile skid-mounted drilling fluid cooling device, comprising a skid-mounted box and a drilling fluid cooling system installed in the box, wherein the drilling fluid cooling system comprises a drilling fluid inlet pipeline, a drilling fluid delivery pipeline, a drilling fluid outlet pipeline, a cooling water inlet pipeline, a cooling water delivery pipeline, a cooling water outlet pipeline, at least one sand pump, at least one water pump and at least one set of plate heat exchangers, wherein the plate heat exchangers are provided with a drilling fluid flow pipeline and a cooling water flow pipeline, and the drilling fluid inlet pipeline is connected to the cooling water outlet pipeline through each sand pump. It is connected to the drilling fluid delivery pipeline, the drilling fluid delivery pipeline is connected to the drilling fluid outlet pipeline through each drilling fluid flow pipeline, the cooling water inlet pipeline is connected to the cooling water delivery pipeline through each water pump, the cooling water delivery pipeline is connected to the cooling water outlet pipeline through each cooling water flow pipeline, the inlet end of each sand pump is equipped with a sand pump valve, the inlet end of each water pump is equipped with a water pump valve, the inlet port of each drilling fluid flow pipeline is equipped with a first heat exchanger valve, and the inlet port of each cooling water flow pipeline is equipped with a second heat exchanger valve.

[0009] By using the above mobile skid-mounted drilling fluid cooling device, when the drilling fluid temperature is lower than the set value, the cooling water circulation is closed, and the drilling fluid only needs to flow through the plate heat exchanger for natural cooling and heat dissipation. When the drilling fluid temperature is higher than the set value, the cooling water circulation is opened, and the drilling fluid exchanges heat with the cooling water when flowing through the plate heat exchanger, so as to achieve efficient and rapid cooling. In addition, the opening quantity of the sand pump, water pump and plate heat exchanger can be independently controlled by valves to adapt to the flow rate and heat dissipation performance requirements of the drilling fluid, so that the entire drilling fluid cooling system can flexibly adjust the mode and heat dissipation performance according to the cooling requirements of the drilling fluid, greatly reducing the waste of resources and reducing the cost of drilling fluid cooling; in addition, the entire drilling fluid cooling system is integrated and installed in a skid-mounted box, which is easy to realize overall transportation and installation, which not only shortens the time of well site construction, but also avoids the waste of resources caused by demolition, and further reduces the cost of drilling fluid cooling.

[0010] In some embodiments, the box body is a rectangular parallelepiped structure, and a plurality of hanging rope hanging seats are installed on the base of the box body.

[0011] In some embodiments, the drilling fluid delivery pipeline and the drilling fluid outlet pipeline are also connected via a direct pipeline, and a direct discharge valve is installed on the direct pipeline.

[0012] In some embodiments, the drilling fluid inlet pipeline is also connected to a drilling fluid discharge pipeline, and a drilling fluid discharge valve is installed on the drilling fluid discharge pipeline.

[0013] In some embodiments, a drilling fluid flow meter is installed on the drilling fluid delivery pipeline, and a cooling water flow meter is installed on the cooling water delivery pipeline.

[0014] The second aspect of the present application relates to a drilling fluid circulation system, comprising a first drilling fluid tank, a second drilling fluid tank, a heat dissipation water tank and the above-mentioned mobile skid-mounted drilling fluid cooling device, wherein the liquid inlet of the first drilling fluid tank is connected to the bottom of the wellbore through a drilling fluid withdrawal pipeline, the liquid outlet of the first drilling fluid tank is connected to the liquid inlet of the drilling fluid inlet pipeline through a drilling fluid input pipeline, a first drilling fluid pump is installed on the drilling fluid input pipeline, the liquid inlet of the second drilling fluid tank is connected to the liquid outlet of the drilling fluid outlet pipeline through a drilling fluid output pipeline, and the liquid outlet of the second drilling fluid tank is connected to the drilling fluid delivery channel of the drill pipe through a drilling fluid return pipeline. The inlet of the heat dissipation water tank is connected, a second drilling fluid pump is installed on the drilling fluid return pipeline, a first temperature sensor is installed in the first drilling fluid tank, the liquid inlet of the heat dissipation water tank is connected with the cooling water outlet pipeline through the cooling water output pipeline, the liquid outlet of the heat dissipation water tank is connected with the cooling water inlet pipeline through the cooling water input pipeline, a cooling water circulation pump is installed on the cooling water input pipeline, and a PLC control cabinet is installed in the box body, which can not only collect data from the first temperature sensor, but also control the opening and closing of each sand pump valve, water pump valve, first heat exchanger valve, second heat exchanger valve, sand pump, water pump and cooling water circulation pump.

[0015] The above drilling fluid circulation system can not only efficiently cool the drilling fluid, but also the PLC control cabinet can automatically select whether to open the cooling water circulation and the number of sand pumps, water pumps and plate heat exchangers to start according to the drilling fluid temperature data collected by the first temperature sensor, thereby improving the automation level of the system.

[0016] In some embodiments, a second temperature sensor is installed in the second drilling fluid tank.

[0017] In some embodiments, a third temperature sensor is installed at the outlet of the drilling fluid delivery channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure of the mobile skid-mounted drilling fluid cooling device after removing part of the box;

[0019] Figure 2 This is a front view of the mobile skid-mounted drilling fluid cooling device after part of the box is removed;

[0020] Figure 3 Schematic diagram after the plate heat exchanger is removed for the drilling fluid cooling system;

[0021] Figure 4 This is the schematic diagram of the drilling fluid circulation system;

[0022] Figure 5 Schematic diagram for the coolant selection control. DETAILED DESCRIPTION

[0023] The utility model is further described below in conjunction with embodiments and drawings.

[0024] Embodiment 1:

[0025] like Figure 1-Figure 3 As shown, a mobile skid-mounted drilling fluid cooling device mainly includes a skid-mounted box 1 and a drilling fluid cooling system installed in the box 1. The entire drilling fluid cooling system is integrated and installed in a skid-mounted box 1, which is easy to transport and install as a whole, which not only shortens the time of well site construction, but also avoids waste of resources due to dismantling, and further reduces the cost of drilling fluid cooling.

[0026] Furthermore, the box 1 is a rectangular structure. The box 1 can be a rectangular frame structure, which is easy to dissipate heat, or a rectangular box structure, which has better protection for the drilling fluid cooling system. Most importantly, the base of the box 1 is a rectangular structure, and a plurality of suspension rope hooking seats 1a are installed on the base of the box 1, so that it is easy to connect with the lifting device and transfer the whole to the transport vehicle. In addition, a metal plate capable of shielding rain is provided on the top of the box 1, so as to prevent rainwater from eroding and damaging the drilling fluid cooling system.

[0027] In this embodiment, the drilling fluid cooling system includes a drilling fluid inlet pipeline 2, a drilling fluid delivery pipeline 3, a drilling fluid outlet pipeline 4, a cooling water inlet pipeline 5, a cooling water delivery pipeline 6, a cooling water outlet pipeline 7, at least one sand pump 8, at least one water pump 9 and at least one set of plate heat exchangers 10. The plate heat exchangers 10 are provided with a drilling fluid flow pipeline and a cooling water flow pipeline. The drilling fluid inlet pipeline 2 is connected to the drilling fluid delivery pipeline 3 through each sand pump 8, and the drilling fluid delivery pipeline 3 is connected to the drilling fluid delivery pipeline 3 through each drilling fluid. The liquid flow pipeline is connected with the drilling fluid outlet pipeline 4, the cooling water inlet pipeline 5 is connected with the cooling water delivery pipeline 6 through each water pump 9, the cooling water delivery pipeline 6 is connected with the cooling water outlet pipeline 7 through each cooling water flow pipeline, the inlet end of each sand pump 8 is equipped with a sand pump valve 11, the inlet end of each water pump 9 is equipped with a water pump valve 12, the liquid inlet of each drilling fluid flow pipeline is equipped with a first heat exchanger valve 33, and the liquid inlet of each cooling water flow pipeline is equipped with a second heat exchanger valve 34.

[0028] Therefore, when the drilling fluid temperature is lower than the set value, the cooling water circulation is closed, that is, each water pump 9 is shut down. The drilling fluid delivered from the drilling fluid inlet pipeline 2 is pumped into the drilling fluid delivery pipeline 3 through one or more sand pumps 8, and then the drilling fluid flows through one or more plate heat exchangers 10. After the drilling fluid flows through the pipeline for natural cooling, the cooled drilling fluid is output through the drilling fluid outlet pipeline 4.

[0029] When the drilling fluid temperature is higher than the set value, the cooling water circulation is turned on, that is, each water pump 9 is started. The drilling fluid delivered from the drilling fluid inlet pipeline 2 is pumped into the drilling fluid delivery pipeline 3 through one or more sand pumps 8, and then the drilling fluid flows through the drilling fluid flow pipeline of one or more plate heat exchangers 10; at the same time, the cooling water delivered from the cooling water inlet pipeline 5 is pumped into the cooling water delivery pipeline 6 through one or more water pumps 9, and then the cooling water flows through the cooling water flow pipeline of one or more plate heat exchangers 10; at this time, the heat of the high-temperature drilling fluid in the drilling fluid flow pipeline is quickly and efficiently transferred to the low-temperature cooling water in the cooling water flow pipeline, realizing efficient heat exchange; the cooled drilling fluid is then output through the drilling fluid outlet pipeline 4, and the high-temperature cooling water is output through the cooling water outlet pipeline 7.

[0030] It should be pointed out that, since the plate heat exchanger 10 is provided with many cooling fins, when the cooling water circulation is closed, the drilling fluid flows through one or more plate heat exchangers 10 and the drilling fluid flows through the pipeline to dissipate heat through the cooling fins and the air, which is still highly efficient, but the efficiency is lower than the heat exchange with cooling water.

[0031] Moreover, the opening quantity of the sand pump 8, water pump 9 and plate heat exchanger 10 in this embodiment can be independently controlled by valves to adapt to the flow rate and heat dissipation performance requirements of the drilling fluid, so that the entire drilling fluid cooling system can flexibly adjust the mode and heat dissipation performance according to the cooling requirements of the drilling fluid, greatly reducing the waste of resources and reducing the cost of drilling fluid cooling.

[0032] For further information, see Figure 3 The drilling fluid delivery pipeline 3 and the drilling fluid outlet pipeline 4 are also connected through a direct connection pipeline 13, and a direct discharge valve 14 is installed on the direct connection pipeline 13. When the temperature of the drilling fluid is very low, the drilling fluid does not need to be cooled, so the direct discharge valve 14 is opened, and the first heat exchanger valve 33 is closed at the same time, so that the drilling fluid does not need to flow through the plate heat exchanger 10, and the drilling fluid in the drilling fluid delivery pipeline 3 is directly delivered to the drilling fluid outlet pipeline 4 through the direct connection pipeline 13, thereby reducing the maintenance of the plate heat exchanger 10 and reducing the operating cost.

[0033] Furthermore, the drilling fluid inlet pipeline 2 is also connected to the drilling fluid discharge pipeline 15, and a drilling fluid discharge valve 16 is installed on the drilling fluid discharge pipeline 15. When the amount of cuttings carried by the drilling fluid is too large, the drilling fluid needs to be replaced, so the drilling fluid discharge valve 16 is opened and the sand pump valve 11 is closed at the same time, and the drilling fluid in the drilling fluid inlet pipeline 2 can be discharged to the wastewater tank through the drilling fluid discharge pipeline 15 for treatment.

[0034] In this embodiment, a drilling fluid flow meter 17 is installed on the drilling fluid delivery pipeline 3, and a cooling water flow meter 18 is installed on the cooling water delivery pipeline 6. The drilling fluid flow meter 17 can accurately measure the flow of drilling fluid, and the cooling water flow meter 18 can accurately measure the flow of cooling water, and flexibly adjust the opening number of the sand pump 8, the water pump 9 and the plate heat exchanger 10, so that the entire drilling fluid cooling system can flexibly adjust the mode and heat dissipation performance according to the cooling demand of the drilling fluid, greatly reducing the waste of resources and reducing the cost of drilling fluid cooling.

[0035] Embodiment 2:

[0036] See also Figure 4 A drilling fluid circulation system comprises a first drilling fluid tank 19, a second drilling fluid tank 20, a heat dissipation water tank 35 and the above-mentioned mobile skid-mounted drilling fluid cooling device, wherein the liquid inlet of the first drilling fluid tank 19 is connected to the bottom of a wellbore 22 through a drilling fluid withdrawal pipeline 21, the liquid outlet of the first drilling fluid tank 19 is connected to the liquid inlet of a drilling fluid inlet pipeline 2 through a drilling fluid input pipeline 23, a first drilling fluid pump 24 is installed on the drilling fluid input pipeline 23, the liquid inlet of the second drilling fluid tank 20 is connected to the liquid outlet of a drilling fluid outlet pipeline 4 through a drilling fluid output pipeline 25, the liquid outlet of the second drilling fluid tank 20 is connected to the inlet of a drilling fluid delivery channel 27a of a drill pipe 27 through a drilling fluid return pipeline 26, and the drilling fluid is cooled by the heat dissipation water tank 35. A second drilling fluid pump 28 is installed on the well fluid return pipeline 26, a first temperature sensor 29 is installed in the first drilling fluid tank 19, the liquid inlet of the heat dissipation water tank 35 is connected with the cooling water outlet pipeline 7 through the cooling water output pipeline 36, the liquid outlet of the heat dissipation water tank 35 is connected with the cooling water inlet pipeline 5 through the cooling water input pipeline 37, a cooling water circulation pump 38 is installed on the cooling water input pipeline 37, and a PLC control cabinet 30 is installed in the box body 1, which can not only collect data from the first temperature sensor 29, but also control the opening and closing of each sand pump valve 11, water pump valve 12, first heat exchanger valve 33, second heat exchanger valve 34, sand pump 8, water pump 9 and cooling water circulation pump 38.

[0037] The drilling fluid circulated back from the wellbore 22 flows into the first drilling fluid tank 19 through the drilling fluid withdrawal pipeline 21, and the temperature of the drilling fluid is detected by the first temperature sensor 29 in the first drilling fluid tank 19. When the drilling fluid temperature is lower than the set value, the cooling water circulation is closed, and the drilling fluid only needs to flow through the plate heat exchanger 10 for natural cooling and heat dissipation. When the drilling fluid temperature is higher than the set value, the cooling water circulation is opened, and the drilling fluid exchanges heat with the cooling water when flowing through the plate heat exchanger 10, thereby achieving efficient and rapid cooling.

[0038] A second temperature sensor 31 is installed in the second drilling fluid tank 20, so that the temperature of the drilling fluid during the return can be accurately detected to better ensure the working stability of the drill pipe 27. A third temperature sensor 32 is installed at the outlet of the drilling fluid delivery channel 27a, which can accurately detect the bottom hole temperature of the wellbore 22, so as to adjust the flow rate of the drilling fluid in real time and ensure the working stability of the drill pipe 27. A third temperature sensor 39 is installed on the heat dissipation water tank 35 to monitor the delivery temperature of the cooling water, adaptively adjust the flow rate of the cooling water, and ensure the heat exchange efficiency of the drilling fluid.

[0039] See also Figure 5 The PLC control cabinet 30 is based on fuzzy PID and PLC visual control technology, combined with feedback signals and data collected by various sensors such as temperature, flow, pressure, etc., and after sorting, integrating and analyzing the collected data, the human-computer interaction interface established by the configuration software is used to realize the visual automatic control of the skid-mounted drilling fluid cooling system.

[0040] In the control system of the PLC control cabinet 30, the PLC serves as the main control unit. It receives the precise data processed by the fuzzy PID controller, monitors the temperature and flow of the drilling fluid and cooling water, and controls the operation of the coolant pump and valve according to the preset parameters and logic rules. The PLC can also communicate with other systems, such as an alarm system or a data recording device. The PLC receives the control quantity processed by the fuzzy PID controller, and the PLC control unit processes the data and issues an alarm prompt through the alarm device.

[0041] In general, the functions of the PLC control cabinet 30 include: real-time display of the temperature, flow, pressure and level of the drilling fluid and cooling water, switch control of each valve in the pipeline, display and recording of alarm and fault information. Functions for setting and adjusting the parameters of the drilling fluid and cooling water, such as setting the temperature range or flow limit. Control the start and stop and regulation functions of each pump, valve and other equipment.

[0042] Furthermore, due to the harsh environment of the wellbore 22, the third temperature sensor 32 preferably uses a digital temperature sensor DS18B20 with a "one-wire bus" interface, which only needs one data bus for data transmission. DS18B20 has an A / D conversion function, which converts the detected analog quantity into a digital quantity and inputs it into the fuzzy PID controller. After the fuzzy PID operates on these signals, it outputs a control signal and sends it to the PLC control unit. The PLC will operate on these signals to ensure that the sensor signals are correctly transmitted to the PLC to control the operation of the actuator.

[0043] Finally, it should be noted that the above description is only a preferred embodiment of the present invention. Under the guidance of the present invention, ordinary technicians in this field can make a variety of similar expressions without violating the purpose and claims of the present invention, and such changes fall within the scope of protection of the present invention.

Claims

1. A mobile skid-mounted drilling fluid cooling device, characterized in that: The invention comprises a skid-mounted casing (1) and a drilling fluid cooling system installed in the casing (1), wherein the drilling fluid cooling system comprises a drilling fluid inlet pipeline (2), a drilling fluid delivery pipeline (3), a drilling fluid outlet pipeline (4), a cooling water inlet pipeline (5), a cooling water delivery pipeline (6), a cooling water outlet pipeline (7), at least one sand pump (8), at least one water pump (9) and at least one set of plate heat exchangers (10), wherein the plate heat exchangers (10) are provided with a drilling fluid flow pipeline and a cooling water flow pipeline, and the drilling fluid inlet pipeline (2) is connected to the drilling fluid delivery pipeline (3) through each sand pump (8). The drilling fluid delivery pipeline (3) is connected to the drilling fluid outlet pipeline (4) through each drilling fluid flow pipeline, the cooling water inlet pipeline (5) is connected to the cooling water delivery pipeline (6) through each water pump (9), the cooling water delivery pipeline (6) is connected to the cooling water outlet pipeline (7) through each cooling water flow pipeline, the inlet end of each sand pump (8) is equipped with a sand pump valve (11), the inlet end of each water pump (9) is equipped with a water pump valve (12), the inlet port of each drilling fluid flow pipeline is equipped with a first heat exchanger valve (33), and the inlet port of each cooling water flow pipeline is equipped with a second heat exchanger valve (34).

2. The mobile skid-mounted drilling fluid cooling device according to claim 1 is characterized in that: The box body (1) is a rectangular parallelepiped structure, and a plurality of hanging rope hanging seats (1a) are installed on the base of the box body (1).

3. The mobile skid-mounted drilling fluid cooling device according to claim 1 is characterized in that: The drilling fluid delivery pipeline (3) and the drilling fluid outlet pipeline (4) are also connected via a direct connection pipeline (13), and a direct discharge valve (14) is installed on the direct connection pipeline (13).

4. The mobile skid-mounted drilling fluid cooling device according to claim 1 is characterized in that: The drilling fluid inlet pipeline (2) is also connected to a drilling fluid discharge pipeline (15), and a drilling fluid discharge valve (16) is installed on the drilling fluid discharge pipeline (15).

5. The mobile skid-mounted drilling fluid cooling device according to claim 1 is characterized in that: A drilling fluid flow meter (17) is installed on the drilling fluid delivery pipeline (3), and a cooling water flow meter (18) is installed on the cooling water delivery pipeline (6).

6. A drilling fluid circulation system, characterized in that: The invention comprises a first drilling fluid tank (19), a second drilling fluid tank (20), a heat dissipation water tank (35) and a mobile skid-mounted drilling fluid cooling device according to any one of claims 1 to 5, wherein the liquid inlet of the first drilling fluid tank (19) is connected to the bottom of a wellbore (22) through a drilling fluid withdrawal pipeline (21), the liquid outlet of the first drilling fluid tank (19) is connected to the liquid inlet of a drilling fluid inlet pipeline (2) through a drilling fluid input pipeline (23), a first drilling fluid pump (24) is installed on the drilling fluid input pipeline (23), the liquid inlet of the second drilling fluid tank (20) is connected to the liquid outlet of a drilling fluid outlet pipeline (4) through a drilling fluid output pipeline (25), the liquid outlet of the second drilling fluid tank (20) is connected to the inlet of a drilling fluid delivery channel (27a) of a drill pipe (27) through a drilling fluid return pipeline (26), and the drilling fluid return pipeline (26) is connected to the inlet of a drilling fluid delivery channel (27a) of a drill pipe (27). A second drilling fluid pump (28) is installed on the pipeline (26); a first temperature sensor (29) is installed in the first drilling fluid tank (19); a liquid inlet of the heat dissipation water tank (35) is connected to a cooling water outlet pipeline (7) via a cooling water outlet pipeline (36); a liquid outlet of the heat dissipation water tank (35) is connected to a cooling water inlet pipeline (5) via a cooling water input pipeline (37); a cooling water circulation pump (38) is installed on the cooling water input pipeline (37); a PLC control cabinet (30) is installed in the box body (1); the PLC control cabinet (30) can not only collect data from the first temperature sensor (29), but also control the opening and closing of each sand pump valve (11), water pump valve (12), first heat exchanger valve (33), second heat exchanger valve (34), sand pump (8), water pump (9) and cooling water circulation pump (38).

7. The drilling fluid circulation system according to claim 6, characterized in that: A second temperature sensor (31) is installed in the second drilling fluid tank (20).

8. The drilling fluid circulation system according to claim 6 or 7, characterized in that: A third temperature sensor (32) is installed at the outlet of the drilling fluid delivery channel (27a).

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