CN204386830U - Fluid end, the CO of one chamber multi-cylinder piston pump 2injection pump and flooding apparatus - Google Patents

Abstract

The utility model relates to a hydraulic end of a one-cavity multi-cylinder piston pump, and also relates to a one-cavity multi-cylinder piston CO2 injection pump and an oil displacement device. At the hydraulic end of a one-chamber multi-cylinder piston pump, a pump chamber (7) is provided in the pump head body (4), and multiple cylinder liners (6) are fixed in the pump chamber (7) at intervals, and the conveying medium is fed into the pump chamber (7). The liquid port (13) enters the pump chamber (7) and reaches the inlet of each piston (10). The one-chamber multi-cylinder piston _CO2 injection pump includes a power end and the above-mentioned liquid power end, and an exhaust port (5) connected to the pump chamber (7) is provided on the upper part of the pump head body (4). The oil flooding device includes a _CO2 storage tank (19) and the above-mentioned one-cavity multi-cylinder piston _CO2 injection pump, and the exhaust port (5) communicates with the upper part of the _CO2 storage tank (19) through an exhaust pipe (23). The utility model has the advantages of simple structure, low processing cost, high working efficiency, safety and reliability, avoiding waste of raw materials and the like.

Description

Fluid end of one-cavity multi-cylinder piston pump, CO2 injection pump and oil displacement device

technical field

The utility model relates to a fluid end of a one-cavity multi-cylinder piston pump, and also relates to a fluid end of a one-cavity multi-cylinder piston pump for injecting _CO2 downhole during crude oil exploitation, a CO2 injection pump and an oil displacement device.

Background technique

The single-cylinder piston pump has low working efficiency, low flow rate and low pressure, and its application range is greatly limited. In the existing multi-cylinder piston pump, each cylinder liner corresponds to a pump chamber, and the processing of the pump head body is very complicated and the processing cost is high. When using the existing single-cylinder or multi-cylinder piston pumps to inject _CO2 downhole, because the gaseous _CO2 in the pump body has no reasonable gas-liquid separation mechanism, it needs to be forced to exhaust, causing a lot of waste and environmental pollution, and there is a safety hazard Hidden danger, it is easy to frostbite the operator, and the high-pressure liquid or gas in the pump body is very dangerous when forced exhaust. There is no reasonable solution, and it is easy to generate cavitation, which seriously reduces the working efficiency of the piston pump.

Contents of the invention

The technical problem to be solved by the utility model is: to overcome the deficiencies of the prior art, to provide a hydraulic end of a one-cavity multi-cylinder piston pump with simple structure, convenient processing and low cost, and to provide a high-efficiency, pump-cavity Automatic separation of gas and liquid, rapid return of gas to the storage tank, no need for forced exhaust, safe and reliable hydraulic end of one-cavity multi-cylinder piston pump, CO2 injection pump and oil displacement device.

The technical solution adopted by the utility model to solve the technical problem is: the hydraulic end of the one-cavity multi-cylinder piston pump includes a pump head body, a plurality of cylinder sleeves and a plurality of pistons, and a pump chamber is provided in the pump head body. A plurality of cylinder liners are fixed in the pump chamber at intervals, and the pistons are slidably arranged in the cylinder liner. A liquid inlet connected to the pump chamber is opened on the pump head body. Pump head assembly, liquid discharge The pump head assembly is provided with a liquid discharge port, and the conveying medium enters the pump chamber from the liquid inlet port and reaches the inlets of each piston. Multiple cylinder liners are fixed in one pump chamber, and the conveying medium can reach the inlets of each piston through the liquid inlet at the same time. The structure is simple, and there is no need to process multiple pump chambers separately. It can be formed by casting at one time, with low processing cost and convenient processing. Especially when using the hydraulic end of the one-cavity multi-cylinder piston pump to transport _CO2 , the volume of the pump chamber is large, which facilitates the rapid gas-liquid automatic separation of _CO2 in the pump chamber, thereby quickly discharging the gaseous _CO2 generated during the working process The pump cavity improves the working efficiency of the pump, and the work is safe and reliable.

Preferably, the liquid discharge pump head assembly includes a liquid discharge valve fixing block and a plurality of liquid discharge valves, a long hole communicating with the pump chamber is opened on the front side of the pump head body, and the liquid discharge valve fixing block is sealed and fixed at the long hole A liquid discharge valve chamber is respectively provided at a position opposite to the piston, the liquid discharge valve is fixed in the liquid discharge valve chamber, and the liquid discharge port is provided on the liquid discharge valve fixed block and communicated with the outlet of the liquid discharge valve. A plurality of liquid discharge valves are fixed at the same time by one liquid discharge valve fixing block, which further makes the processing more convenient, and the front side of the pump body has a long hole, which is convenient for casting and reduces the processing cost.

Preferably, there is one and only one drain port, which is set at the end of the drain valve fixed block, and a drain chamber connected to the outlets of each drain valve is provided on the inner side of the drain valve fixed block, and the drain port is connected to the discharge valve. liquid cavity. The conveying medium discharged from the liquid discharge valve enters the liquid discharge cavity and is discharged through one liquid discharge port, which overcomes the disadvantages of complex structure and high sealing cost of multiple liquid discharge ports in the past.

A one-cavity multi-cylinder piston _CO2 injection pump, including a power end and the above-mentioned hydraulic end, the piston is connected to the power end through a piston rod, and an exhaust port connected to the pump chamber is opened on the upper part of the pump head body. CO ₂ is automatically separated from gas and liquid in the pump chamber, and the gaseous CO ₂ generated in the pump chamber is quickly discharged through the exhaust port and can be returned to the storage tank. No forced exhaust is required, the work is safe and reliable, and the waste of raw material CO ₂ is avoided.

Preferably, the power end includes a motor and an eccentric swing mechanism, the input end of the eccentric swing mechanism is connected to the motor, and the output end of the eccentric swing mechanism is connected to the outer end of the piston rod through a cross head. The piston rod and the eccentric swing mechanism are connected through the cross head, and the work is stable.

Preferably, the eccentric swing mechanism includes a crankshaft and a plurality of connecting rods, one end of the crankshaft is connected to the motor, one end of the connecting rod is rotationally connected to the crankshaft, and the other end is connected to the piston rod through the crosshead. The piston is driven to work by the crankshaft connecting rod structure, the structure is simple and the work is reliable.

Preferably, the crosshead is connected to the piston rod through a double-ended adjusting bolt. It is convenient to adjust the distance between the crosshead and the piston through the double-ended adjusting bolt, and the installation is convenient.

An oil flooding device, comprising a _CO2 storage tank and the above-mentioned one-cavity multi-cylinder piston _CO2 injection pump, the liquid inlet is connected to the outlet of the _CO2 storage tank through the liquid inlet pipe, and the liquid discharge port is connected to the oil well through the liquid discharge pipe The injection pipe, the exhaust port is connected to the upper part of the _CO2 storage tank through the exhaust pipe, and the injection pipe is provided with a heating device. One-cavity multi-cylinder piston _CO2 injection pump produces gaseous _CO2 in the pump chamber, which is automatically separated from gas and liquid, and returns to the _CO2 storage tank through the exhaust port and exhaust pipe to avoid waste of raw material _CO2 .

Preferably, the drain pipe is connected to the CO ₂ storage tank through a precooling return pipe. Before _CO2 is injected downhole, the system needs to be pre-cooled, and the pre-cooled _CO2 is returned to the _CO2 storage tank through the pre-cooling return pipe to avoid waste of _CO2 raw materials.

Preferably, pressure detection devices are respectively connected to the liquid inlet pipe and the liquid discharge pipe, and temperature detection devices are respectively connected to the outlets of the liquid discharge pipe and the injection pipe. The inlet pressure is too low and the outlet pressure is too high to alarm and stop, and the inlet temperature is too high and the gasification temperature is too low to alarm and stop, and the work is safe and reliable.

Compared with the prior art, the beneficial effects of the above-mentioned technical solution of the liquid end of the one-chamber multi-cylinder piston pump are:

1. Fix multiple cylinder liners in one pump chamber, and the conveying medium can reach the inlets of each piston through the liquid inlet at the same time. The structure is simple, and there is no need to process multiple pump chambers separately. It can be formed by casting at one time, and the processing cost is low. convenient. Especially when using the hydraulic end of the one-cavity multi-cylinder piston pump to transport _CO2 , the volume of the pump chamber is large, which facilitates the rapid gas-liquid automatic separation of _CO2 in the pump chamber, thereby quickly discharging the gaseous _CO2 generated during the working process The pump cavity improves the working efficiency of the pump, and the work is safe and reliable.

2. Multiple drain valves are fixed at the same time by a drain valve fixing block, which further makes the processing more convenient, and the front side of the pump body has a long hole, which is convenient for casting and reduces the processing cost; the conveying medium discharged from the drain valve enters the drain cavity, and discharged through one discharge port, which overcomes the disadvantages of complex structure and high sealing cost of multiple discharge ports in the past.

3. CO ₂ is automatically separated from gas and liquid in the pump chamber, and the gaseous CO ₂ generated in the pump chamber is quickly discharged through the exhaust port and can be returned to the storage tank without forced exhaust. The work is safe and reliable, and the loss of raw material CO ₂ is avoided. waste.

4. The gaseous _CO2 generated during the working process of the one-cavity multi-cylinder piston _CO2 injection pump is automatically separated from the gas and liquid in the pump chamber, and returns to the _CO2 storage tank through the exhaust port and exhaust pipe to avoid waste of raw material _CO2 and work Safe and hygienic on site.

5. The inlet pressure is too low and the outlet pressure is too high to alarm and stop, and the inlet temperature is too high and the gasification temperature is too low to alarm and stop, and the work is safe and reliable.

Description of drawings

Fig. 1 is a structural schematic diagram of the fluid end of the one-chamber multi-cylinder piston pump.

Fig. 2 is a structural schematic diagram of the fluid end of the one-chamber multi-cylinder piston pump and the one-chamber multi-cylinder piston _CO injection pump.

Fig. 3 is a structural schematic diagram of the oil displacement device.

Fig. 4 is a schematic diagram of the structure of the eccentric swing mechanism comprising a transmission shaft, an eccentric wheel and a swing connecting rod.

Among them: 1. Drain valve head 2. Drain valve fixed block 3. Drain valve 4. Pump head body 5. Exhaust port 6. Cylinder liner 7. Pump cavity 8. Packing seal assembly 9. Piston rod 10. Piston 11, drain port 12, drain cavity 13, liquid inlet 14, connecting seat 15, double-headed adjusting bolt 16, crosshead 17, connecting rod 18, crankshaft 19, _CO2 storage tank 20, liquid inlet pipe 21, Liquid inlet pressure detection device 22, liquid inlet temperature detection device 23, exhaust pipe 24, pre-cooling return pipe 25, liquid discharge temperature detection device 26, liquid discharge pressure detection device 27, liquid discharge pipe 28, temperature detection device before heating 29 , Carburetor 30, injection pipe 31, injection temperature detection device 32, eccentric wheel 33, transmission shaft 34, sleeve 35, copper sleeve 36, swing connecting rod.

Detailed ways

Fig. 1～3 is the preferred embodiment of the present utility model, below in conjunction with accompanying drawing 1～4 the utility model is described further.

Referring to Figures 1-2, the hydraulic end of the one-cavity multi-cylinder piston pump includes a pump head body 4, multiple cylinder liners 6 and multiple pistons 10, a pump chamber 7 is opened in the pump head body 4, and multiple The cylinder liner 6 is fixed in the pump chamber 7 at intervals, and the piston 10 is slidably arranged in the cylinder liner 6. The pump head body 4 is provided with a liquid inlet 13 connected to the pump chamber 7. The front side of the pump head body 4 is fixed with pistons. 10 matched with the liquid discharge pump head assembly, the liquid discharge pump head assembly is provided with a liquid discharge port 11, and the conveying medium enters the pump chamber 7 through the liquid inlet port 13 and reaches the inlet of each piston 10. Multiple cylinder liners 6 are fixed in one pump chamber 7, and the conveying medium can reach the inlets of each piston 10 through the liquid inlet 13 at the same time. The structure is simple, and there is no need to process multiple pump chambers separately. It can be formed by casting at one time, and the processing cost is low. , Easy to process. Preferably, the pump cavity 7 of the fluid end of the one-cavity multi-cylinder piston pump is a rectangular cavity, which is convenient to process, especially when the fluid end of the one-cavity multi-cylinder piston pump is used to transport _CO2 , the volume of the pump cavity 7 Large, it is convenient for CO ₂ to separate gas and liquid automatically in the pump chamber 7, so that the gaseous CO ₂ generated in the working process can be quickly discharged from the pump chamber 7, and the working efficiency of the pump is improved, and the work is safe and reliable.

The liquid discharge pump head assembly includes a liquid discharge valve fixing block 2 and a plurality of liquid discharge valves 3. The front side of the pump head body 4 is provided with a long hole communicating with the pump chamber 7, and the liquid discharge valve fixing block 2 is sealed and fixed at the long hole. And at the positions opposite to the piston 10, drain valve cavities are respectively set up, the drain valve 3 is fixed in the drain valve cavity, and the outside of the drain valve cavity is sealed by a drain valve head 1. The drain port 11 is opened on the drain valve fixing block 2 and communicates with the outlet of the drain valve 3 . A plurality of liquid discharge valves 3 are fixed at the same time by one liquid discharge valve fixing block 2, which further makes the processing more convenient, and the front side of the pump body has a long hole, which is convenient for casting and reduces the processing cost. There is one and only one drain port 11, which is set at the end of the drain valve fixed block 2, and the inner side of the drain valve fixed block 2 is provided with a drain chamber 12 that communicates with the outlets of each drain valve 3, and the drain port 11 communicates with Drain chamber 12. The conveying medium discharged from the liquid discharge valve 3 all enters the liquid discharge chamber 12 and is discharged through one liquid discharge port 11, which overcomes the disadvantages of multiple liquid discharge ports 11 with complex structures and high sealing costs in the past.

The utility model also provides a one-cavity multi-cylinder piston _CO2 injection pump.

Referring to Fig. 2, the one-chamber multi-cylinder piston _CO2 injection pump includes a power end and the above-mentioned fluid power end, the piston 10 is connected to the power end through a piston rod 9, and a drain that communicates with the pump chamber 7 is provided on the upper part of the pump head body 4. Gas port 5, _CO2 is automatically separated from gas and liquid in the pump chamber 7, and the gaseous _CO2 generated in the pump chamber 7 is quickly discharged through the exhaust port 5 and can be returned to the storage tank without forced exhaust, which is safe and reliable, and avoids The waste of raw material CO ₂ is reduced.

The power end includes a motor (not shown in the figure) and an eccentric swing mechanism. The input end of the eccentric swing mechanism is connected to the motor, and the output end of the eccentric swing mechanism is connected to the outer end of the piston rod 9 through the crosshead 16 . The piston rod 9 and the eccentric swing mechanism are connected through the crosshead 16, and the work is stable. Preferably, the eccentric swing mechanism includes a crankshaft 18 and a plurality of connecting rods 17, one end of the crankshaft 18 is connected to the motor, one end of the connecting rod 17 is rotationally connected to the crankshaft 18, and the other end is connected to the piston rod 9 through the crosshead 16, and the crankshaft The connecting rod structure drives the piston 10 to work, the structure is simple, and the work is reliable. A connecting seat 14 is fixed between the pump head body 4 and the crankshaft 18 , and the crosshead 16 is slidably arranged in the connecting seat 14 . Preferably, the crosshead 16 is connected to the piston rod 9 through a double-headed adjusting bolt 15 . It is convenient to adjust the distance between the crosshead 16 and the piston 10 through the double-ended adjusting bolt 15, and the installation is convenient.

The utility model also provides an oil displacement device.

Referring to Fig. 3, the oil displacement device includes a _CO2 storage tank 19 and the above-mentioned one-cavity multi-cylinder piston _CO2 injection pump, the liquid inlet 13 communicates with the _CO2 storage tank 19 outlet through the liquid inlet pipe 20, and the liquid discharge port 11 passes through The drain pipe 27 communicates with the injection pipe 30 extending into the oil well, the exhaust port 5 communicates with the upper part of the _CO storage tank 19 through the exhaust pipe 23, and the injection pipe 30 is provided with a heating device. The liquid _CO2 in the _CO2 storage tank 19 is transported to the injection pipe 30 through the above-mentioned one-cavity multi-cylinder piston _CO2 injection pump, and the _CO2 in the injection pipe 30 is heated by a heating device to become gaseous _CO2 and injected downhole, thereby The crude oil in the downhole is squeezed, and finally the crude oil is mined up. The gaseous CO ₂ generated during the operation of the one-cavity multi-cylinder piston CO ₂ injection pump is automatically separated from the gas and liquid in the pump chamber 7, and passes through the exhaust port 5 and the exhaust pipe. 23 Return to the _CO2 storage tank. In this embodiment, the heating device adopts the vaporizer 29, which replaces the conventional electromagnetic heater and saves a lot of electric energy. Preferably, the discharge pipe 27 is connected to the _CO2 storage tank 19 through a precooling return pipe 24, and the system needs to be precooled before _CO2 is injected downhole, and the liquid _CO2 first flows through the liquid inlet pipe 20, the pump head Body 4 and liquid discharge pipe 27. In this embodiment, the precooled CO ₂ is returned to the CO ₂ storage tank 19 through the precooling return pipe 24 to avoid waste of CO ₂ raw materials.

Preferably, a pressure detection device is respectively connected to the liquid inlet pipe 20 and the liquid discharge pipe 27, and a temperature detection device is respectively connected to the outlet of the liquid discharge pipe 27 and the injection pipe 30 to detect the working conditions of the oil displacement device in real time. Work safely and reliably. Concrete, on the liquid inlet pipe 20, be provided with the liquid inlet pressure detecting device 21 and the liquid inlet temperature detecting device 22, prevent a large amount of gaseous _CO from entering the pump chamber 7; The discharge pressure detection device 26, the pre-heating temperature detection device 28 is provided on the injection pipe 30 upstream of the vaporizer 29, and the injection temperature detection device 31 is provided at the outlet of the injection pipe 30, and the _CO in the injection pipe 30 is detected by the pre-heating temperature detection device 28. The temperature before the heating of the vaporizer 29 ensures that the _CO in this section of the pipeline is liquid, thereby ensuring the working efficiency of the reciprocating multi-cylinder piston _CO injection pump for the oil well, and the injection temperature detection device 31 detects the CO after the vaporizer 29 is heated. The CO ₂ temperature ensures that the injection is gaseous CO ₂ , and the alarm stops after the inlet temperature is too high and the gasification temperature is too low, and the work is safe and reliable.

Working process: The liquid _CO2 in the _CO2 storage tank 19 enters the pump chamber 7 of the one-cavity multi-cylinder piston _CO2 injection pump through the liquid inlet pipe 20, and the piston 10 works to discharge the _CO2 through the liquid discharge valve 3 from the liquid discharge port 11 , the _CO2 discharged from the drain port 11 is discharged through the drain pipe 27. Before injecting the liquid _CO2 into the oil well, the system needs to be pre-cooled to reach the temperature of the liquid _CO2 , so as to avoid the pump working under the condition of sudden cooling , to improve the service life, specifically, the liquid _CO in _{the CO} storage tank 19 returns to the _CO storage tank by the pre-cooling return pipe 24 after passing through the liquid inlet pipe 20, the pump head body 4, and the liquid discharge pipe 27. When the system temperature drops to After the temperature of the liquid CO ₂ is reached, the precooling is completed, and the one-cavity multi-cylinder piston CO ₂ injection pump delivers the liquid CO ₂ in the CO ₂ storage tank 19 to the injection pipe 30, and injects the gaseous CO ₂ downhole after being heated by the vaporizer 29.

The above is the best embodiment of the utility model, and the utility model can also adopt other structures.

With reference to Fig. 4, eccentric swing mechanism comprises transmission shaft 33, eccentric wheel 32 and swing connecting rod 36 in the present embodiment, and one end of transmission shaft 33 is connected with motor, and a plurality of eccentric wheels 32 are respectively fixed on the transmission shaft 33, and swing connecting rod One end of 36 is fixedly connected with the sleeve 34 sleeved on the outside of the eccentric wheel 32 , and the other end of the swing connecting rod 36 is connected with the crosshead 16 . Preferably, a copper sleeve 35 is fixed inside the sleeve 34, and the self-lubricating and wear-resistant properties of the copper sleeve 35 are used to reduce friction, wear and heat, and increase the service life.

The above is only a preferred embodiment of the utility model, and is not intended to limit the utility model in other forms. Any skilled person who is familiar with this profession may use the technical content disclosed above to change or remodel it into an equivalent change. Equivalent embodiment. However, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present utility model without departing from the content of the technical solution of the utility model still belong to the protection scope of the technical solution of the utility model.

Claims (10)

1. A hydraulic end of a one-cavity multi-cylinder piston pump, characterized in that it includes a pump head body (4), multiple cylinder liners (6) and multiple pistons (10), and the inside of the pump head body (4) There is a pump chamber (7), and a plurality of cylinder liners (6) are fixed in the pump chamber (7) at intervals, the piston (10) is slidably arranged in the cylinder liner (6), and the pump head body (4) is provided with There is a liquid inlet (13) connected to the pump chamber (7). The front side of the pump head body (4) is fixed with a liquid discharge pump head assembly that cooperates with each piston (10). Port (11), the conveying medium enters the pump chamber (7) from the liquid inlet (13) and reaches the inlet of each piston (10). 2. The liquid end of a one-cavity multi-cylinder piston pump according to claim 1, characterized in that: the liquid discharge pump head assembly includes a liquid discharge valve fixing block (2) and a plurality of liquid discharge valves (3) , the front side of the pump head body (4) is provided with a long hole communicating with the pump chamber (7), and the liquid discharge valve fixing block (2) is sealed and fixed at the long hole and is respectively set at the position opposite to the piston (10). In the valve cavity, the drain valve (3) is fixed in the drain valve cavity, and the drain port (11) is opened on the drain valve fixing block (2) and communicated with the outlet of the drain valve (3). 3. The hydraulic end of a one-cavity multi-cylinder piston pump according to claim 2, characterized in that: there is one and only one drain port (11), which is opened at the end of the drain valve fixing block (2) , The inside of the drain valve fixing block (2) is provided with a drain chamber (12) connected to the outlet of each drain valve (3), and the drain port (11) is connected to the drain chamber (12). 4. A one-cavity multi-cylinder piston _CO2 injection pump, characterized in that it includes a power end and the hydraulic end according to any one of claims 1 to 3, and the piston (10) is connected to the power end through a piston rod (9) , the upper part of the pump head body (4) is provided with an exhaust port (5) communicating with the pump chamber (7). 5. The one-cavity multi-cylinder piston _CO injection pump according to claim 4, characterized in that: the power end includes a motor and an eccentric swing mechanism, the input end of the eccentric swing mechanism is connected to the motor, and the output end of the eccentric swing mechanism Connect the outer end of the piston rod (9) through the crosshead (16). 6. The one-chamber multi-cylinder piston CO _injection pump according to claim 5, characterized in that: the eccentric swing mechanism includes a crankshaft (18) and a plurality of connecting rods (17), and one end of the crankshaft (18) is connected to a motor , one end of the connecting rod (17) is rotationally connected with the crankshaft (18), and the other end is connected with the piston rod (9) through the crosshead (16). 7. The one-chamber multi-cylinder piston CO ₂ injection pump according to claim 5 or 6, characterized in that: the crosshead (16) is connected to the piston rod (9) through a double-headed adjusting bolt (15). 8. An oil flooding device, characterized in that it includes a _CO2 storage tank (19) and a one-cavity multi-cylinder piston _CO2 injection pump according to any one of claims 4 to 7, and the liquid inlet (13) passes through the inlet The liquid pipe (20) is connected to the outlet of the _CO2 storage tank (19), the liquid discharge port (11) is connected to the injection pipe (30) extending into the oil well through the liquid discharge pipe (27), and the exhaust port (5) is connected to the exhaust pipe (23) is connected to the upper part of the _CO2 storage tank (19), and the injection pipe (30) is provided with a heating device. 9. The oil displacement device according to claim 8, characterized in that: the drain pipe (27) is connected to the CO ₂ storage tank (19) through a pre-cooling return pipe (24). 10. The oil displacement device according to claim 8, characterized in that: the inlet pipe (20) and the discharge pipe (27) are respectively connected with a pressure detection device, and the discharge pipe (27) and the injection The outlets of the tubes (30) are respectively connected with temperature detection devices.