Cementing equipment and control methods

Abstract

This application relates to a cementing device and control method. The cementing device includes a centrifugal pump, a plunger pump, and a lubrication system. The lubrication system includes: a lubricating oil pump with a first lubricating oil outlet and a second lubricating oil outlet; a first distribution valve with a first inlet, at least one first outlet, and a third outlet, wherein the first outlet is connected to the packing lubrication end of the centrifugal pump, and the first lubricating oil outlet is connected to the first inlet; and a second distribution valve with a second inlet and at least one second outlet, wherein the second outlet is connected to the packing lubrication end of the plunger pump, and the second lubricating oil outlet is connected to the second inlet, or the second lubricating oil outlet is connected to the first inlet, and the second inlet is connected to the third outlet. According to the cementing device of the present invention, it is possible to separately control the supply of lubricating oil to the plunger pump packing or to the centrifugal pump packing, thus avoiding both lubricating oil waste and insufficient lubrication of either the centrifugal pump packing or the plunger pump packing.

Description

Technical Field

[0001] This application relates to the field of cementing equipment technology, and more particularly to a cementing device and control method. Background Technology

[0002] Cementing equipment is equipped with a high-pressure plunger pump and a centrifugal pump. The high-pressure plunger pump is used to pressurize and pump the cement slurry, delivering the mixed slurry between the wellbore and the casing to secure the casing. The centrifugal pump is mainly used for mixing the cement slurry in the cementing equipment and supplying the mixed slurry to the high-pressure plunger pump. During operation, the plunger of the high-pressure plunger pump reciprocates, so packing is used to seal the plunger and prevent high-pressure mud from leaking out. Similarly, during operation, the pump shaft of the centrifugal pump rotates, and packing is also used to seal the pump shaft.

[0003] The packing seals of high-pressure plungers and centrifugal pumps, as described above, will experience friction between the plunger and packing, and between the pump shaft and packing, due to the reciprocating and rotating motion during operation. This will generate heat and cause wear on the packing, reducing its service life. Therefore, in order to reduce friction and remove heat, lubrication is required for the packing seals of both.

[0004] Currently, the commonly used packing lubrication systems for equipment include air-coated oil packing lubrication systems and electric grease lubrication systems. Air-coated oil packing lubrication systems, due to their serious pollution problems, are gradually being replaced by electric grease lubrication systems. Existing electric grease lubrication systems suffer from the problem of not being able to independently control the lubrication of centrifugal pump packing and high-pressure plunger pump packing. Their principle is to control the electric grease lubrication system by detecting the displacement of the high-pressure plunger pump. When the high-pressure plunger pump is detected to have a displacement output, the electric grease lubrication system is activated, simultaneously supplying grease to both the high-pressure plunger pump packing and the centrifugal pump packing. This lubrication method has two main problems: First, if the centrifugal pump is not working, grease will still flow to its packing, causing a large accumulation and significant waste. Second, if only the centrifugal pump is working and the high-pressure plunger pump is not, the electric grease lubrication system will not activate because the displacement output of the high-pressure plunger pump cannot be detected, resulting in insufficient lubrication of the centrifugal pump packing and potential packing burnout. Summary of the Invention

[0005] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a cementing device that provides lubricating oil to the centrifugal pump packing and the plunger pump packing respectively by setting a first pump head and a second pump head, enabling separate control and avoiding both lubricant waste and insufficient lubrication of the centrifugal pump packing or the plunger pump packing.

[0006] According to the cementing equipment of the present invention, the cementing equipment includes a centrifugal pump and a plunger pump, and a lubrication system. The lubrication system includes: a lubricating oil pump, which includes a first channel, a first lubricating oil outlet communicating with the first channel, a second channel, and a second lubricating oil outlet communicating with the second channel. A first pump head is provided in the first channel, and a second pump head is provided in the second channel; a first distribution valve, which includes a first inlet, at least one first outlet, and a third outlet. The first inlet is respectively connected to at least one first outlet, and the first outlet is connected to the packing lubrication end of the centrifugal pump. The first lubricating oil outlet is connected to the first inlet; and a second distribution valve, which includes a second inlet and at least one second outlet. The second inlet is respectively connected to at least one second outlet, and the second outlet is connected to the packing lubrication end of the plunger pump. The second lubricating oil outlet is connected to the second inlet, or the second lubricating oil outlet is connected to the first inlet, and the second inlet is connected to the third outlet.

[0007] According to the cementing equipment of the present invention, by setting a first pump head and a second pump head to provide lubricating oil to the centrifugal pump packing and the plunger pump packing respectively, separate control can be achieved. When the plunger pump is running and the centrifugal pump is on standby, the second pump head runs to provide lubricating oil to the plunger pump packing, while the first pump head is on standby. When the centrifugal pump is running and the plunger pump is on standby, the first pump head runs to provide lubricating oil to the centrifugal pump packing, while the second pump head is on standby. In this way, neither lubricating oil is wasted nor is there insufficient lubrication of the centrifugal pump packing or the plunger pump packing.

[0008] According to the cementing equipment of the present invention, the lubricating oil pump further includes an oil tank, the oil tank including a first return port, and the cementing equipment further includes a first three-way valve, the first three-way valve including a first port, a second port and a third port, the first port being connected to a first outlet, the second port being connected to the packing lubrication end of the centrifugal pump, and the third port being connected to the first return port, wherein the first three-way valve has a first state and a second state, in the first state the first port is connected to the second port, and in the second state the first port is connected to the third port.

[0009] Optionally, the oil tank also includes a second return port, and the cementing equipment also includes a second three-way valve. The second three-way valve includes a fourth port, a fifth port, and a sixth port. The fourth port is connected to the second lubricating oil outlet or the third outlet, the fifth port is connected to the second inlet, and the sixth port is connected to the second return port. The second three-way valve has a third state and a fourth state. In the third state, the fourth port is connected to the fifth port, and in the fourth state, the fourth port is connected to the sixth port.

[0010] According to the cementing equipment of the present invention, there are multiple centrifugal pumps and multiple first inlets, with each centrifugal pump corresponding to a first inlet, and each first inlet connected to the packing lubrication end of each centrifugal pump.

[0011] Optionally, the first distribution valve further includes at least two third outlets, the second distribution valve includes at least two, and the plunger pump includes at least two. The third outlets, the second distribution valves, and the plunger pumps correspond one-to-one, and each third outlet is connected to a second inlet.

[0012] According to the cementing equipment of the present invention, a first sensor is provided on the centrifugal pump and a second sensor is provided on the plunger pump. The cementing equipment also includes an electrical control unit, and both the first sensor and the second sensor are electrically connected to the electrical control unit.

[0013] According to the cementing equipment of the present invention, both the first lubricating oil outlet and the second lubricating oil outlet are provided with overflow valves and pressure switches, and / or a check valve is provided on the pipeline connecting the first outlet to the packing lubrication end of the centrifugal pump.

[0014] According to the cementing equipment of the present invention, the packing lubrication end of the plunger pump includes multiple lubrication points, and the third outlet includes multiple outlets, with each lubrication point corresponding to the third outlet and the lubrication point communicating with the third outlet.

[0015] According to the control method of the present invention, for controlling the above-mentioned cementing equipment, the method includes: detecting whether a centrifugal pump is running; when the centrifugal pump is running, controlling the first lubricating oil outlet of the lubricating oil pump to provide lubricating oil to the packing lubrication end of the centrifugal pump; detecting whether a plunger pump is running; when the plunger pump is running, controlling the second lubricating oil outlet of the lubricating oil pump to provide lubricating oil to the packing lubrication end of the plunger pump.

[0016] Optionally, when the centrifugal pump is in a stopped state, the first three-way valve is controlled to be in the second state; when the plunger pump is in a stopped state, the second three-way valve is controlled to be in the fourth state. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the first three-way valve of the cementing equipment according to Embodiment 1 of the present invention being an electromagnetic three-way valve;

[0020] Figure 2 This is a schematic diagram of the first three-way valve of the cementing equipment according to Embodiment 1 of the present invention being a hydraulically controlled directional valve;

[0021] Figure 3 This is a schematic diagram of the cementing equipment according to Embodiment 2 of the present invention when the first three-way valve is an electromagnetic three-way valve;

[0022] Figure 4 This is a schematic diagram of the first three-way valve of the cementing equipment according to Embodiment 2 of the present invention being a hydraulically controlled directional valve;

[0023] Figure 5 This is a flowchart illustrating the control method according to an embodiment of the present invention.

[0024] Figure label:

[0025] Lubrication system 100, lubricating oil pump 101, first pump head 1, second pump head 2, pressure switch 3, overflow valve 4, first distributor valve 5, second distributor 6, one-way valve 7, first three-way valve 8, solenoid three-way valve 81, hydraulic directional valve 82, second three-way valve 9, first sensor 10, second sensor 11, control unit 12, plunger pump 13, lubrication point 132, centrifugal pump 14, first centrifugal pump 142, second centrifugal pump 144, oil tank 15. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] Regarding the definition of terms in this application: Packing, also called packing, is usually made of soft, woven thread. It is filled into a sealed cavity by strips of packing with a square cross-sectional area, thereby achieving a seal and preventing liquid leakage.

[0028] like Figure 1 and Figure 3 As shown, the cementing equipment according to an embodiment of the present invention includes a centrifugal pump 14, a plunger pump 13, and a lubrication system 100. The lubrication system 100 includes a lubricating oil pump 101, a first distribution valve 5, and a second distribution valve 6.

[0029] Specifically, the lubricating oil pump 101 includes a first channel, a first lubricating oil outlet connected to the first channel, a second channel, and a second lubricating oil outlet connected to the second channel. A first pump head 1 is provided in the first channel, and a second pump head 2 is provided in the second channel. The first distribution valve 5 includes a first inlet, at least one first outlet, and a third outlet. The first inlet is connected to at least one first outlet, and the first outlet is connected to the packing lubrication end of the centrifugal pump 14. The first lubricating oil outlet is connected to the first inlet. The second distribution valve 6 includes a second inlet and at least one second outlet. The second inlet is connected to at least one second outlet, and the second outlet is connected to the packing lubrication end of the plunger pump 13. The second lubricating oil outlet is connected to the second inlet, or the second lubricating oil outlet is connected to the first inlet, and the second inlet is connected to the third outlet.

[0030] The lubricating oil pump 101 is used to deliver lubricating oil to the lubrication system 100. The function of the first distribution valve 5 is to distribute the lubricating oil flowing in from the first inlet to the first outlet and the third outlet that need to output lubricating oil according to the proportion. The function of the second distribution valve 6 is to distribute the lubricating oil flowing in from the second inlet to the second outlet that needs to output lubricating oil according to the proportion, thereby realizing the control of the output flow rate. Each outlet (first outlet, second outlet and third outlet) corresponds to a branch, and the lubricating oil of each branch can be supplied to one or more lubrication points.

[0031] To elaborate, the first pump head 1 provides the power for the output of lubricating oil to the first lubricating oil outlet. When the centrifugal pump 14 is running, the lubricating oil flows to the first distribution valve 5 through the first lubricating oil outlet, enters the first distribution valve 5 through the first inlet, and after distribution, flows out of the first distribution valve 5 through the first outlet and flows into the packing lubrication end of the centrifugal pump 14, thereby lubricating the packing of the centrifugal pump 14.

[0032] like Figure 1 and Figure 2 As shown, the second pump head 2 provides power for the output of lubricating oil to the second lubricating oil outlet. When the plunger pump 13 is running, the lubricating oil flows to the second distribution valve 6 through the second lubricating oil outlet, flows into the second distribution valve 6 through the second inlet, flows out of the second distribution valve 6 through the second outlet after distribution, and flows into the packing lubrication end of the plunger pump 13, thereby lubricating the packing of the plunger pump 13.

[0033] like Figure 3 and Figure 4As shown, the lubricating oil output from the first lubricating oil outlet and the second lubricating oil outlet can also merge and flow into the first distribution valve 5 through the first inlet. When the centrifugal pump 14 is running, the flow rate of the lubricating oil input to the first distribution valve 5 is controlled to be adapted to the lubrication of the centrifugal pump 14. After distribution, the lubricating oil flows out of the first distribution valve 5 through the first outlet and flows into the packing lubrication end of the centrifugal pump 14, thereby lubricating the packing of the centrifugal pump 14. When the plunger pump 13 is running, the flow rate of the lubricating oil input to the second distribution valve 6 is controlled to be adapted to the lubrication of the plunger pump 13. After distribution, the lubricating oil flows out of the first distribution valve 5 through the third outlet and flows into the second distribution valve 6. In step 6, the lubricating oil flows into the packing lubrication end of the plunger pump 13 through the second outlet, thereby lubricating the packing of the plunger pump 13. When the centrifugal pump 14 and the plunger pump 13 are running simultaneously, the lubricating oil flow rate of the control input first distribution valve 5 is adapted to the lubrication of the centrifugal pump 14 and the plunger pump 13. After distribution, the lubricating oil flows out of the first distribution valve 5 through the first outlet and the third outlet. The lubricating oil flowing out through the first outlet flows to the packing lubrication end of the centrifugal pump 14, thereby lubricating the packing of the centrifugal pump 14. The lubricating oil flowing out through the third outlet flows to the packing lubrication end of the plunger pump 13, thereby lubricating the packing of the plunger pump 13.

[0034] It should be noted that the distribution valves (first distribution valve 5 and second distribution valve 6) include, but are not limited to, damped distributors, volumetric distributors, quantitative pressurized distributors, progressive distributors, and adjustable flow distributors. In the embodiment shown in the attached figures, the distribution valves (first distribution valve 5 and second distribution valve 6) are progressive distributors.

[0035] According to the cementing equipment of the present invention, by setting a first pump head 1 and a second pump head 2 to provide lubricating oil to the packing of the centrifugal pump 14 and the packing of the plunger pump 13 respectively, the packing of the plunger pump 13 usually requires a larger flow rate of lubricating oil, while the packing of the centrifugal pump 14 requires a smaller flow rate of lubricating oil. The amount of oil pumped by the first pump head 1 and the second pump head 2 can be controlled separately to meet the lubricating oil requirements of the plunger pump 13 and the centrifugal pump 14 respectively. When the plunger pump 13 is running and the centrifugal pump 14 is on standby, the second pump head 2 runs to provide lubricating oil to the packing of the plunger pump 13, while the first pump head 1 is in standby mode. When the centrifugal pump 14 is running and the plunger pump 13 is on standby, the first pump head 1 runs to provide lubricating oil to the packing of the centrifugal pump 14, while the second pump head 2 is in standby mode. In this way, neither lubricating oil is wasted nor is there insufficient lubrication of the packing of the centrifugal pump 14 or the packing of the plunger pump 13.

[0036] like Figure 1 and Figure 2As shown, in the cementing equipment according to an embodiment of the present invention, both the first lubricating oil outlet and the second lubricating oil outlet are equipped with an overflow valve 4 and a pressure switch 3. That is, the first lubricating oil outlet is equipped with an overflow valve 4 and a pressure switch 3, and the second lubricating oil outlet is also equipped with an overflow valve 4 and a pressure switch 3. The overflow valve 4 prevents lubricating oil from flowing into the lubrication system 100, i.e., lubricating oil flowing from the first lubricating oil outlet into the lubricating oil pump 101, or lubricating oil flowing into the lubricating oil pump 101 from the second lubricating oil outlet, thus protecting the lubricating oil pump 101. The pressure switch 3 ensures that when the pressure at the first and second lubricating oil outlets reaches a set pressure, it controls the lubricating oil pump 101 to stop operating, thus protecting the lubricating oil pump 101.

[0037] like Figure 3 and Figure 4 As shown, in some embodiments, when both the first lubricating oil outlet and the second lubricating oil outlet are connected to the first inlet, a single overflow valve 4 can be used.

[0038] According to an embodiment of the cementing equipment of the present invention, a one-way valve 7 is provided on the pipeline connecting the first outlet to the packing lubrication end of the centrifugal pump 14, so as to prevent the backflow of lubricating oil.

[0039] like Figure 1 and Figure 3 As shown, in the cementing equipment according to an embodiment of the present invention, the packing lubrication end of the plunger pump 13 includes a plurality of lubrication points 132, and the third outlet includes a plurality of lubrication points 132 and the third outlet are one-to-one corresponding. The lubrication points 132 are connected to the third outlet. Since the packing of the plunger pump 13 requires a large amount of lubricating oil, setting multiple lubrication points 132 can ensure that the packing of the plunger pump 13 is adequately lubricated.

[0040] like Figure 1 and Figure 3 As shown, in the cementing equipment according to an embodiment of the present invention, there are multiple centrifugal pumps 14 and multiple first inlets, with each centrifugal pump 14 corresponding to a first inlet, and each first inlet communicating with the packing lubrication end of each centrifugal pump 14.

[0041] like Figure 3 and Figure 4 As shown, in some embodiments, the first distribution valve 5 further includes at least two third outlets, the second distribution valve 6 includes at least two, and the plunger pump 13 includes at least two. The third outlets, the second distribution valve 6, and the plunger pump 13 correspond one-to-one, and each third outlet is connected to a second inlet.

[0042] like Figure 1 and Figure 3As shown, in the cementing equipment according to an embodiment of the present invention, a first sensor 10 is provided on the centrifugal pump 14, and a second sensor 11 is provided on the plunger pump 13. The cementing equipment also includes an electronic control unit 12, and both the first sensor 10 and the second sensor 11 are electrically connected to the electronic control unit 12. The first sensor 10 is used to detect whether the centrifugal pump 14 is in operation, and the second sensor 11 is used to detect whether the plunger pump 13 is in operation.

[0043] Example 1:

[0044] like Figure 1 and Figure 2 As shown, the cementing equipment includes a plunger pump 13, two centrifugal pumps 14 and two first sensors 10. Each centrifugal pump 14 is equipped with a first sensor 10. The two centrifugal pumps 14 include a first centrifugal pump 142 and a second centrifugal pump 144. The first lubricating oil outlet is connected to the first inlet, and the second lubricating oil outlet is connected to the second inlet. The first three-way valve 8 corresponds to the centrifugal pump 14 one by one.

[0045] According to an embodiment of the cementing equipment of the present invention, the lubricating oil pump 101 further includes an oil tank 15, and both the first lubricating oil outlet and the second lubricating oil outlet are connected to the oil tank 15. The oil tank 15 includes a first return port. The cementing equipment also includes a first three-way valve 8, which includes a first port, a second port, and a third port. The first port is connected to the first outlet, the second port is connected to the packing lubrication end of the centrifugal pump 14, and the third port is connected to the first return port. The first three-way valve 8 has a first state and a second state. In the first state, the first port is connected to the second port, and in the second state, the first port is connected to the third port. When there are multiple centrifugal pumps 14, each centrifugal pump 14 corresponds to one first three-way valve 8, thereby realizing independent control of the lubrication of each centrifugal pump 14. With this configuration, when the centrifugal pump 14 does not require lubrication, the lubricating oil can flow back to the oil tank 15, preventing accumulation and waste. Especially when there are multiple centrifugal pumps 14, some centrifugal pumps 14 need lubrication and some centrifugal pumps 14 do not. This allows the centrifugal pumps 14 that need lubrication to be lubricated, while the lubricating oil on the corresponding branch of the centrifugal pumps 14 that do not need lubrication can flow back to the oil tank 15, preventing accumulation and waste.

[0046] like Figure 1As shown, the first three-way valve 8 is an electromagnetic three-way valve 81. When the first sensor 10 detects that the speed of the centrifugal pump 14 is 0, it is identified that the centrifugal pump 14 is not running, and the first three-way valve 8 enters the second state. At this time, the lubricating oil output from the first lubricating oil outlet flows back to the oil tank 15 through the first distribution valve 5, the first three-way valve 8 and the first return oil port in sequence. When the first sensor 10 detects that the speed of the centrifugal pump 14 is not 0, it is identified that the centrifugal pump 14 is running, and the first three-way valve 8 enters the first state, and the first port is connected to the second port. At this time, the lubricating oil output from the first lubricating oil outlet flows through the first distribution valve 5, the first three-way valve 8 and the packing lubrication end of the centrifugal pump 14 in sequence, thereby lubricating the centrifugal pump 14.

[0047] like Figure 2 As shown, the first three-way valve 8 is a hydraulically controlled directional valve 82. When the centrifugal pump 14 is not running, there is no oil pressure at the hydraulic control port of the hydraulically controlled directional valve 82. Under the action of the spring, the hydraulically controlled directional valve 82 moves to open the first port and the third port. At this time, the lubricating oil output from the first lubricating oil outlet flows back to the oil tank 15 through the first distribution valve 5, the first three-way valve 8 and the first return port in sequence. When the centrifugal pump 14 is running, the oil pressure is transmitted to the hydraulic control port of the hydraulically controlled directional valve 82. At this time, the hydraulically controlled directional valve 82 opens the first port and the second port. The lubricating oil output from the first lubricating oil outlet flows through the first distribution valve 5, the first three-way valve 8 and the packing lubrication end of the centrifugal pump 14 in sequence, thereby lubricating the centrifugal pump 14.

[0048] In some embodiments, the oil tank 15 further includes a second return port, and the cementing equipment further includes a second three-way valve 9. The second three-way valve 9 includes a fourth port, a fifth port, and a sixth port. The fourth port is connected to a second lubricating oil outlet or a third outlet, the fifth port is connected to a second inlet, and the sixth port is connected to the second return port. The second three-way valve 9 has a third state and a fourth state. In the third state, the fourth port is connected to the fifth port, and in the fourth state, the fourth port is connected to the sixth port.

[0049] In other words, when the second sensor 11 detects that the output displacement of the plunger pump 13 is 0, it is identified that the plunger pump 13 is not running. At this time, the second three-way valve 9 is in the fourth state, and the lubricating oil output from the second lubricating oil outlet flows back to the oil tank 15 through the first three-way valve 8 and the first return oil port in sequence. When the plunger pump 13 is detected to have a displacement output, it is identified that the plunger pump 13 is running. The second three-way valve 9 enters the third state, and the fourth port is connected to the fifth port. At this time, the lubricating oil output from the second lubricating oil outlet flows through the second three-way valve 9, the second distribution valve 6 and the packing lubrication end of the plunger pump 13 in sequence, thereby lubricating the plunger pump 13.

[0050] Example 2:

[0051] like Figure 3and Figure 4 As shown, the cementing equipment includes two plunger pumps 13 and at least one centrifugal pump 14. The first lubricating oil outlet and the second lubricating oil outlet are both connected to the first inlet. The plunger pumps 13 correspond one-to-one with the second three-way valves 9. The fourth port of the second three-way valves 9 is connected to the third outlet, the fifth port is connected to the second inlet, and the sixth port is connected to the second return port. The second three-way valves 9 have a third state and a fourth state. In the third state, the fourth port is connected to the fifth port, and in the fourth state, the fourth port is connected to the sixth port.

[0052] like Figure 3 As shown, the first three-way valve 8 is an electromagnetic three-way valve 81. When the first sensor 10 detects that the speed of the centrifugal pump 14 is not 0, it is identified that the centrifugal pump 14 is in operation. The electromagnetic three-way valve 81 enters the first state, and the first port is connected to the second port. At this time, the lubricating oil output by the lubricating oil pump 101 passes through the first distribution valve 5, the electromagnetic three-way valve 81 and the packing lubrication end of the centrifugal pump 14 in sequence, thereby lubricating the centrifugal pump 14. When the first sensor 10 detects that the speed of the centrifugal pump 14 is 0, it is identified that the centrifugal pump 14 is not running. The electromagnetic three-way valve 81 enters the second state. At this time, the lubricating oil output from the first lubricating oil outlet flows back to the oil tank 15 through the first distribution valve 5, the electromagnetic three-way valve 81 and the first return oil port in sequence.

[0053] like Figure 4 As shown, the first three-way valve 8 is a hydraulically controlled directional valve 82. When the centrifugal pump 14 is running, the oil pressure is transmitted to the hydraulic control port of the hydraulically controlled directional valve 82. At this time, the hydraulically controlled directional valve 82 enters the first state, and the first port is connected to the second port. At this time, the lubricating oil output by the lubricating oil pump 101 passes through the first distribution valve 5, the first three-way valve 8, and the packing lubrication end of the centrifugal pump 14 in sequence, thereby lubricating the centrifugal pump 14. When the centrifugal pump 14 is not running, there is no oil pressure at the hydraulic control port of the hydraulically controlled directional valve 82. Under the action of the spring, the hydraulically controlled directional valve 82 moves to connect the first port and the third port, and the hydraulically controlled directional valve 82 enters the second state. At this time, the lubricating oil output from the first lubricating oil outlet flows back to the oil tank 15 through the first distribution valve 5, the hydraulically controlled directional valve 82, and the first return port in sequence.

[0054] When the plunger pump 13 is running, the second three-way valve 9 is in the third state, and the fourth and fifth ports are connected. At this time, the lubricating oil output by the lubricating oil pump 101 passes through the first distribution valve 5, the second three-way valve 9, the second distribution valve 6, and the packing lubrication end of the plunger pump 13 in sequence, thereby lubricating the plunger pump 13. When the plunger pump 13 is stopped, the second three-way valve 9 is in the fourth state, and the fourth and sixth ports are connected. At this time, the lubricating oil output by the lubricating oil pump 101 flows back to the oil tank 15 through the first distribution valve 5, the second three-way valve 9, and the second return port in sequence.

[0055] The rest will not be repeated.

[0056] like Figure 5 As shown, according to the control method of the present invention, for controlling the above-mentioned cementing equipment, the method includes:

[0057] Step S1: Check if centrifugal pump 14 is running;

[0058] Step S2: When the centrifugal pump 14 is in operation, control the first lubricating oil outlet of the lubricating oil pump 101 to open and provide lubricating oil to the packing lubrication end of the centrifugal pump 14, and control the first three-way valve 8 to be in the first state.

[0059] Step S3: Check if the plunger pump 13 is running;

[0060] Step S4: When the plunger pump 13 is in operation, control the second lubricating oil outlet of the lubricating oil pump 101 to open and provide lubricating oil to the packing lubrication end of the plunger pump 13, and control the second three-way valve 9 to be in the third state.

[0061] Steps S1 and S3 are not in any particular order and their order can be adjusted.

[0062] According to the cementing equipment of the present invention, by setting a first pump head 1 and a second pump head 2 to provide lubricating oil to the packing of the centrifugal pump 14 and the packing of the plunger pump 13 respectively, the packing of the plunger pump 13 usually requires a larger flow rate of lubricating oil, while the packing of the centrifugal pump 14 requires a smaller flow rate of lubricating oil. The amount of oil pumped by the first pump head 1 and the second pump head 2 can be controlled separately to meet the lubricating oil requirements of the plunger pump 13 and the centrifugal pump 14 respectively. When the plunger pump 13 is running and the centrifugal pump 14 is on standby, the second pump head 2 runs to provide lubricating oil to the packing of the plunger pump 13, while the first pump head 1 is in standby mode. When the centrifugal pump 14 is running and the plunger pump 13 is on standby, the first pump head 1 runs to provide lubricating oil to the packing of the centrifugal pump 14, while the second pump head 2 is in standby mode. In this way, neither lubricating oil is wasted nor is there insufficient lubrication of the packing of the centrifugal pump 14 or the packing of the plunger pump 13.

[0063] In some embodiments, when the centrifugal pump 14 is in a stopped state, the first three-way valve 8 is controlled to be in a second state; when the plunger pump 13 is in a stopped state, the second three-way valve 9 is controlled to be in a fourth state.

[0064] According to the control method of the present invention, when the centrifugal pump 14 does not require lubrication, the lubricating oil can flow back to the oil tank 15, preventing accumulation and waste. Especially when there are multiple centrifugal pumps 14, and some centrifugal pumps 14 require lubrication while others do not, the method enables the centrifugal pumps 14 that require lubrication to receive lubrication, while the lubricating oil on the branch corresponding to the centrifugal pumps 14 that do not require lubrication can flow back to the oil tank 15, preventing accumulation and waste.

[0065] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0066] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0067] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A cementing device, characterized in that, The cementing equipment includes a centrifugal pump, a plunger pump, and a lubrication system, the lubrication system comprising: A lubricating oil pump, the lubricating oil pump including a first channel, a first lubricating oil outlet communicating with the first channel, a second channel and a second lubricating oil outlet communicating with the second channel, a first pump head being provided in the first channel and a second pump head being provided in the second channel; A first distribution valve, comprising a first inlet, at least one first outlet, and a third outlet, wherein the first inlet is connected to the at least one first outlet, the first outlet is connected to the packing lubrication end of the centrifugal pump, and the first lubricating oil outlet is connected to the first inlet. The second distribution valve includes a second inlet and at least one second outlet. The second inlet is connected to the at least one second outlet, and the second outlet is connected to the packing lubrication end of the plunger pump. The second lubricating oil outlet is connected to the second inlet. The second lubricating oil outlet is connected to the first inlet, and the second inlet is connected to the third outlet.

2. The cementing equipment according to claim 1, characterized in that, The lubricating oil pump also includes an oil tank, which includes a first return port. The cementing equipment also includes a first three-way valve, which includes a first port, a second port, and a third port. The first port is connected to the first outlet, the second port is connected to the packing lubrication end of the centrifugal pump, and the third port is connected to the first return port. The first three-way valve has a first state and a second state. In the first state, the first port is connected to the second port, and in the second state, the first port is connected to the third port.

3. The cementing equipment according to claim 2, characterized in that, The oil tank also includes a second return port, and the cementing equipment also includes a second three-way valve, which includes a fourth port, a fifth port, and a sixth port. The fourth port is connected to either the second lubricating oil outlet or the third outlet, the fifth port is connected to the second inlet, and the sixth port is connected to the second return port. The second three-way valve has a third state and a fourth state. In the third state, the fourth port is connected to the fifth port, and in the fourth state, the fourth port is connected to the sixth port.

4. The cementing equipment according to claim 1, characterized in that, The centrifugal pumps include multiple types, and the first inlet includes multiple types. Each centrifugal pump corresponds to one of the first inlets, and each first inlet is connected to the packing lubrication end of each centrifugal pump.

5. The cementing equipment according to claim 4, characterized in that, The first distribution valve further includes at least two third outlets, the second distribution valve includes at least two, and the plunger pump includes at least two. The third outlets, the second distribution valves, and the plunger pumps are in one-to-one correspondence, and each third outlet is connected to a second inlet.

6. The cementing equipment according to claim 1, characterized in that, The centrifugal pump is equipped with a first sensor, the plunger pump is equipped with a second sensor, and the cementing equipment also includes an electrical control unit. The first sensor and the second sensor are both electrically connected to the electrical control unit.

7. The cementing equipment according to claim 1, characterized in that, Both the first and second lubricating oil outlets are equipped with overflow valves and pressure switches, and / or a check valve is provided on the pipeline connecting the first outlet to the packing lubrication end of the centrifugal pump.

8. The cementing equipment according to claim 1, characterized in that, The plunger pump has a packing lubrication end with multiple lubrication points, and a third outlet with multiple outlets. Each lubrication point corresponds to one of the third outlets, and the lubrication points are connected to the third outlets.

9. A control method for controlling a cementing device as described in any one of claims 1-2 and 4-8, characterized in that, include: Check if the centrifugal pump is running; When the centrifugal pump is in operation, the first lubricating oil outlet of the control lubricating oil pump is turned on to provide lubricating oil to the packing lubrication end of the centrifugal pump; Check if the plunger pump is running; When the plunger pump is in operation, the second lubricating oil outlet of the lubricating oil pump is controlled to open to provide lubricating oil to the packing lubrication end of the plunger pump.

10. A control method for controlling the cementing equipment as described in claim 3, characterized in that, include: Check if the centrifugal pump is running; When the centrifugal pump is in operation, the first lubricating oil outlet of the control lubricating oil pump is turned on to provide lubricating oil to the packing lubrication end of the centrifugal pump; Check if the plunger pump is running; When the plunger pump is in operation, the second lubricating oil outlet of the lubricating oil pump is controlled to open to provide lubricating oil to the packing lubrication end of the plunger pump.

11. The control method according to claim 10, characterized in that, When the centrifugal pump is in a stopped state, the first three-way valve is controlled to be in the second state; When the plunger pump is stopped, the second three-way valve is controlled to be in the fourth state.

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