WO2017177475A1

WO2017177475A1 - Quick powder polymer dispersion and dilution system for offshore or alpine or fault-block oil field

Info

Publication number: WO2017177475A1
Application number: PCT/CN2016/079949
Authority: WO
Inventors: 刘松荫; 刘正正; 刘方; 刘彦彬; 王中奇
Original assignee: 河南正佳能源环保股份有限公司
Priority date: 2016-04-14
Filing date: 2016-04-22
Publication date: 2017-10-19
Also published as: CN105756638A

Abstract

A quick powder polymer dispersion and dilution system for an offshore or alpine or fault-block oil field, comprising a water supply tank (12), a dry powder tank (11), and a buffer tank (10). The water supply tank (12), the dry powder tank (11), and the buffer tank (10) are all connected to a nitrogen source (27). The dry powder tank (11) is successively connected to a feeder (16), a buffer container (15), a negative pressure jet device (14), and the buffer tank (10). The water supply tank (12) is successively connected to a water supply pump (13) and the negative pressure jet device (14). The water supply tank (12) is further connected to a dilution water pump (18). The buffer tank (10) is connected to a mother liquid transfer pump (17). The outlet of the mother liquid transfer pump (17) is connected to the outlet of the dilution water pump (18). By the system, the current problem of great influences caused by the external environment on quick dispersion of powder polymer into injected water and system operation is resolved. The system has a compact structure and is easy to move. The entire system is under the protection of nitrogen, so that the impact of the external environment can be avoided, and oxygen in the air is prevented from degrading the viscosity of a target liquid to influence oil productivity.

Description

Rapid dispersion and dilution system of powdered polymer in offshore or alpine or faulty oil fields

Technical field

The invention belongs to the technical field of oil field injection, and particularly relates to a rapid dispersion and dilution system of powdered polymer in an offshore or high-cold or fault block oil field.

Background technique

Primary oil recovery refers to the method of oil field exploitation by relying on the natural energy of the reservoir. Secondary oil recovery refers to the method of water injection and gas injection. It is a method to maintain and supplement the energy of the reservoir. After the secondary oil recovery, the oil field still has 60%-70% of the crude oil residue is difficult to recover in the underground. In order to economically and efficiently extract the remaining oil remaining in the formation and improve oil recovery, tertiary oil recovery technology is required. Polymer flooding is a kind of tertiary oil recovery technology. It refers to dispersing water-soluble polymer (such as powder polymer) into injection water to increase the viscosity of injected water, improve the ratio of water to oil flow rate, improve the sweep efficiency and microscopic drive. Oil displacement efficiency, thereby improving oil recovery methods.

As shown in FIG. 1, the system currently used for dispersing the powdery polymer into the injected water includes a dry powder tank 1, a screw feeder 2, an ejector 3, a blower 4, a gouache mixer 5, a dissolution tank 6, and a transfer pump 7. And a ripener 8, wherein the dry powder tank 1, the screw feeder 2, the ejector 3, the gouache mixer 5, the dissolution tank 6, the transfer pump 7 and the sterilizer 8 are sequentially connected, and the powdery polymer in the dry powder tank 1 passes The screw feeder 2 is quantitatively conveyed to the ejector 3, and the blower 4 blows the pulverized polymer in the ejector 3 to the gouache mixer 5, and the pulverized polymer is sufficiently wetted with water in the gouache mixer 5, followed by powdery The mixture of polymer and water enters the dissolution tank 6 and is initially mixed and stirred, and then the mixture of the powdery polymer and water is sent to the ripener 8 via the transfer pump 9, and is continuously stirred in the ripener 8 to uniformly disperse the powdery polymer. In the water, the powdery polymer is finally dissolved completely in water to form a mother liquor, and the mother liquor is diluted into a target liquid according to the rated concentration, and then injected into the well.

However, the system currently used to disperse the powdery polymer into the injected water is greatly affected by the external environment. For example, the blower 4 blows outside air into the system, and the moisture in the outside air causes the polymer to absorb moisture and unite, which causes the feeding effect. In addition, the entry of oxygen degrades the viscosity of the target liquid and affects the oil recovery.

Summary of the invention

In order to solve the problem that the system currently used for dispersing the powdery polymer into the injected water is greatly affected by the external environment, the present invention proposes a rapid dispersion and dilution system of the powdery polymer in an offshore or alpine or faulty oil field, the sea Or the rapid dispersion of the powdery polymer in the alpine or fault block oil field, the dilution system comprises a water supply tank, a dry powder tank and a buffer tank, wherein the water supply tank, the dry powder tank and the buffer tank are connected with a nitrogen source; the dry powder tank is connected with the feed in turn a buffer tank, a negative pressure jet and the buffer tank; the water supply tank is connected in sequence with a water supply pump and the negative pressure jet, the water supply tank is further connected with a dilution water pump; the outlet of the buffer tank is connected with a mother liquor a transfer pump, the outlet of the mother liquid transfer pump being connected to the outlet of the dilution water pump.

Among them, the powdery polymer in the offshore or alpine or fault block oil field is rapidly dispersed, and the structure of the dilution system is armored.

Wherein, the buffer container is a funnel.

Wherein the funnel is a visual funnel.

Wherein, the powdery polymer rapid dispersion and dilution system of the offshore or alpine or fault block oil field further comprises an automatic control module, wherein the automatic control module comprises a PLC controller and a host computer, and the PLC controller is connected to the upper computer An electromagnetic flowmeter, a pressure transmitter and an electric valve are arranged on the pipeline between the water supply pump and the negative pressure jet, and the electromagnetic flowmeter, the pressure transmitter and the electric valve are both connected to the PLC controller connection.

An electric valve is disposed between the water supply tank and the nitrogen source, and the electric valve is connected to the PLC controller, and an electric valve is disposed between the dry powder tank and the nitrogen source, and the electric valve and the electric valve are The PLC controller is connected, and an electric valve is disposed between the buffer tank and the nitrogen source, and the electric valve is connected to the PLC controller.

Wherein, the output pipe of the dilution water pump is provided with an electric valve, an electromagnetic flowmeter and a pressure transmitter, and the electric valve, the electromagnetic flowmeter and the pressure transmitter are all connected with the PLC controller.

Wherein, the output pipeline of the mother liquid delivery pump is provided with an electric valve, an electromagnetic flowmeter and a pressure transmitter, and the electric valve, the electromagnetic flowmeter and the pressure transmitter are all connected with the PLC controller.

Wherein, the water supply tank is provided with a temperature transmitter and a liquid level transmitter, and the temperature transmitter and the liquid level transmitter are all connected with the PLC controller; the buffer tank is provided with a liquid level change A transmitter and a pressure transmitter are connected to the PLC controller.

Wherein, the buffer tank, the pipeline between the buffer tank and the mother liquid transfer pump, and the output pipeline of the mother liquid transfer pump are all made of 316L stainless steel.

The rapid dispersion and dilution system of the powdered polymer of the marine or alpine or fault block oil field of the invention has the following beneficial effects:

The powdery polymer in the offshore or alpine or fault block oil field of the present invention is rapidly dispersed, and the dilution system is first filled with nitrogen when used, so that the inside of the system of the present invention is in a slightly positive pressure nitrogen atmosphere; the system of the present invention uses a negative pressure gas stream (nitrogen gas). Airflow) The method of pumping the powdered polymer into the negative pressure jet, the entire process is carried out in a closed environment, so that the outside air does not enter the system of the present invention, and the entire system of the present invention It is protected by nitrogen to prevent the external environment from affecting the system of the present invention, preventing the oxygen in the air from degrading the viscosity of the target liquid and affecting the oil recovery rate, thereby protecting the stability of the chemical properties of the target liquid. Since nitrogen is a dry and stable inert gas, the nitrogen in the dry powder tank can prevent the powdery polymer from being agglomerated by moisture, which is favorable for the accuracy of the subsequent powdery polymer configuration.

The rapid dispersion and dilution system of the powdered polymer in the offshore or high-cold or fault block oil field of the invention is automatically controlled by PLC, the operation is simple, the manpower and time are saved, the labor cost is reduced, the equipment operation is more stable and safe, and the powder is improved. The accuracy of polymer formulation, the configured mother liquor can meet the requirements of field use, and the concentration of the target liquid can be adjusted according to different requirements.

The powder polymer in the offshore or high-cold or fault block oil field of the invention has a structure of rapid dispersing and diluting system, which is armored, so that the occupied space is small, the system weight is small, the movement is convenient, the use problems of different oil fields are solved, and the problem is improved. The utilization rate of the equipment is suitable for use in offshore, high-cold or fault-block oilfield oil production platforms, especially when it is applied to the construction of a high-cost offshore oil production platform, which can greatly reduce the construction cost of offshore oil production platforms and reduce the investment of oilfield injection equipment. cost.

DRAWINGS

1 is a schematic view showing the structure of a prior art system for dispersing a powdery polymer into water for injection;

2 is a schematic structural view of a rapid dispersion and dilution system of a powdery polymer in an offshore or alpine or fault block oil field according to the present invention;

3 is a schematic view showing the structure of an automatic control module for a rapid dispersion and dilution system of a powdery polymer in an offshore or alpine or faulty oil field according to the present invention.

detailed description

The technical solution of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 2, the powdery polymer rapid dispersion and dilution system of the marine or alpine or fault block oil field of the present invention comprises a water supply tank 12, a dry powder tank 11 and a buffer tank 10, and the water supply tank 12 is used for storing injection water, and the dry powder tank 11 For storing the powdery polymer, the buffer tank 10 is used for temporarily storing the mother liquid mixed with the powdered polymer, and the water supply tank 12, the dry powder tank 11 and the buffer tank 10 are connected with the nitrogen source 27 through the pipeline, and the water supply is provided. An electric valve 21 is disposed on the pipeline between the tank 12 and the nitrogen source 27, and an electric valve 21 is disposed on the pipeline between the dry powder tank 11 and the nitrogen source 27, and an electric circuit is disposed on the pipeline between the buffer tank 10 and the nitrogen source 27. Valve 21.

As shown in FIG. 3, the powdery polymer rapid dispersion and dilution system of the marine or alpine or fault block oil field of the present invention further includes an automatic control module including a PLC (Programmable Logic Controller) controller. 24 and the upper computer 25, the PLC controller 24 is connected to the upper computer 25, and the electric valve 21 is connected to the PLC controller 24, so that the electric valve 21 can be controlled by the upper computer 25 and the PLC controller 24.

As shown in FIG. 2, the dry powder tank 11 is sequentially connected with a feeder 16, a buffer container 15, a negative pressure jet 14 and a buffer tank 10. The feeder 16 may be a screw feeder, and the feeder 16 can The powdery polymer is metered, the amount of the powdery polymer mixed with the injected water is controlled, and on the other hand, the powdery polymer can be transferred to the buffer vessel 15. The buffer container 15 is for temporarily storing the powdery polymer, and the buffer container 15 may be a funnel. Preferably, the buffer container 15 is a visible funnel, and the top of the visible funnel is transparent so that the user can observe the buffer. The case of a powdery polymer inside the container 15.

The water supply tank 12 is connected with a water supply pump 13 and a negative pressure jet 14 in turn, and an electromagnetic flowmeter 19, a pressure transmitter 20 and an electric valve 21 are provided on the pipeline between the water supply pump 13 and the negative pressure jet 14 The flow meter 19, the pressure transmitter 20, and the electric valve 21 are all connected to the PLC controller 24; the water supply tank 12 is also connected with a dilution water pump 18, and the injected water in the water supply tank 12 can flow into the dilution water pump 18. The outlet of the buffer tank 10 is connected with a mother liquid transfer pump 17, and the outlet of the mother liquid transfer pump 17 is connected to the outlet of the dilution water pump 18 through a pipeline, so that the injected water output from the dilution water pump 18 is mixed with the mother liquid output from the mother liquid transfer pump 17, and the mother liquid is mixed. Dilute to the target solution according to the rated concentration. As shown in FIG. 3, the water supply pump 13, the dilution water pump 18, and the mother liquid delivery pump 17 are all connected to the PLC controller 24 via the inverter 26, so that the water supply pump 13, the dilution water pump 18, and the mother liquid delivery pump can be used by using the PLC controller 24. 17 to control. The water supply tank 12 is provided with a temperature transmitter 23 and a liquid level transmitter 22; the buffer tank 10 is provided with a liquid level transmitter 22 and a pressure transmitter 20, the temperature transmitter 23, the liquid level transmitter Both 22 and pressure transmitter 20 are coupled to PLC controller 24.

As shown in Figure 2-3, the following describes the working process of the rapid dispersion and dilution system of the powdered polymer in the offshore or alpine or fault block oil field of the present invention: First, the valve of the nitrogen source 27 is turned on, and the nitrogen enters the present invention. In the system, the system of the present invention is filled with nitrogen; the electric valve 21 is controlled by the PLC controller 24 to regulate the nitrogen entering the system of the present invention, so that the system of the present invention is in a slightly positive pressure environment, i.e., within the system of the present invention. The air pressure is slightly greater than atmospheric pressure so that outside air does not enter the system of the present invention, and the system of the present invention is protected by nitrogen to prevent the oxygen in the air from degrading the viscosity of the target liquid and affecting the oil recovery rate.

In the second step, the water supply pump 13 is activated, the injected water in the water supply tank 12 flows to the negative pressure jet 14, and the electromagnetic flowmeter 19 between the water supply pump 13 and the negative pressure jet 14 is used to detect the flow rate of the injected water in the pipeline and The flow rate, pressure transmitter 20 is used to detect the pressure in the pipeline. When the flow rate and pressure of the injected water in the pipeline reach the set value, the electric motor between the water supply pump 13 and the negative pressure jet 14 is turned on by the PLC controller. The valve 21, the high-speed injection water enters the negative pressure jet 14, passes through the negative pressure jet 14 and flows into the buffer tank 10, and when the high-speed injection water flows through the negative pressure jet 14, the negative pressure is formed in the negative pressure jet 14. The gas stream, which is circulated between the negative pressure jet 14 and the buffer vessel 15, is a nitrogen gas stream.

In the third step, the feeder 16 is activated, and the feeder 16 defines the powdery polymer in the dry powder tank 11. The amount is uniformly added to the buffer vessel 15, and when the nitrogen gas stream flows from the buffer vessel 15 to the negative pressure jet 14, the powdery polymer in the buffer vessel 15 is brought to the negative pressure jet 14, and the powdery polymer is in the negative pressure jet. The device 14 is mixed with a high-speed injection water stream, and the powdery polymer is dispersed in the injection water. The system of the present invention uses a vacuum gas flow to add the powdered polymer to the negative pressure jet 14 and the entire process of adding the powdered polymer to the negative pressure jet 14 is carried out in a closed environment. The influence of the external environment on the system of the present invention is avoided, so that the system of the present invention is under nitrogen protection. The negative pressure jet 14 can adopt the structure of a jet mixing and dispersing device disclosed in the patent application No. 201510058219.1, which is formed by injecting water into the periphery and into the form of a powdery polymer, so that water and powdery polymer are injected. The mixture is more uniform, avoiding agglomerates, fish eyes and air bubbles, and the concentration of the mother liquor is higher, and the mother liquor concentration can reach 15000 PPM (parts permillion, parts per million), which improves the efficiency of the mother liquor.

In the fourth step, the injected water and the powdery polymer are mixed in the negative pressure jet 14 to form a mother liquid, and the mother liquid flows into the buffer tank 10, and the liquid level transmitter 22 in the buffer tank 10 is used for detecting the liquid level of the mother liquid. When the mother liquid reaches the set liquid level, the mother liquid transfer pump 17 and the dilution water pump 18 are activated by the PLC controller 24, and the mother liquid transfer pump 17 outputs the mother liquid from the buffer tank 10, and the mother liquid output from the mother liquid transfer pump 17 and the output of the dilution water pump 18 are injected. The water is mixed, and the mother liquor is diluted to a target liquid according to the rated concentration.

The mother liquid transfer pump 17 is activated when the mother liquid in the buffer tank 10 reaches the set liquid level, in order to protect the mother liquid transfer pump 17, and prevent the mother liquid transfer pump 17 from being evacuated, thereby ensuring stable operation of the mother liquid transfer pump 17. Similarly, the level transmitter 22 in the water supply tank 12 is also provided to prevent the dilution water pump 18 from being evacuated. The temperature transmitter 23 is for detecting the temperature of the water supply tank 12, and the pressure transmitter 20 in the buffer tank 10 is for detecting the pressure of the buffer tank 10.

Preferably, the buffer tank 10, the line between the buffer tank 10 and the mother liquid transfer pump 17, and the output line of the mother liquid transfer pump 17 are all made of 316L stainless steel, which is extremely resistant to corrosion and prolongs the system of the present invention. The service life.

Preferably, the output line of the mother liquid transfer pump 17 is provided with an electric valve 21, an electromagnetic flow meter 19 and a pressure transmitter 20, and the electric valve 21, the electromagnetic flow meter 19 and the pressure transmitter 20 are all connected with the PLC controller 24. The electromagnetic flowmeter 19 is for detecting the flow rate of the mother liquid in the output line of the mother liquid delivery pump 17, and The flow rate, the pressure transmitter 20 is used to detect the pressure of the output line of the mother liquid delivery pump 17, and the PLC controller 24 controls the electric valve 21 and the mother liquid delivery pump 17 according to the detection results of the electromagnetic flowmeter 19 and the pressure transmitter 20 to adjust The amount of the mother liquid output from the mother liquid delivery pump 17. The output pipe of the dilution water pump 18 is provided with an electric valve 21, an electromagnetic flowmeter 19 and a pressure transmitter 20, and the electric valve 21, the electromagnetic flowmeter 19 and the pressure transmitter 20 are all connected with the PLC controller 24, and similarly, The PLC controller 24 can adjust the amount of the injected water output from the dilution water pump 18, and the injected water output from the dilution water pump 18 is mixed with the mother liquid output from the mother liquid delivery pump 17, and finally the mother liquid is diluted into a target liquid of a predetermined concentration.

Preferably, the powdery polymer in the offshore or alpine or fault block oil field of the present invention is rapidly dispersed, and the structure of the dilution system is armored. The skid mounted type refers to integrating the components of the dispersing and diluting system of the present invention into one whole. On the base, an integrated way of installation and movement can be integrated, so that the occupied space is small, the system weight is small, and the movement is convenient, the use problems of different oil fields are solved, the utilization rate of the equipment is improved, and the utility model is suitable for at sea, high cold or broken block. It can be used on oilfield oil production platforms, especially when it is used to build a high-cost offshore oil production platform, which can greatly reduce the construction cost of offshore oil production platforms and reduce the input cost of oilfield injection equipment.

Claims

A rapid dispersion and dilution system of powdered polymer in an offshore or alpine or faulty oil field, characterized in that it comprises a water supply tank, a dry powder tank and a buffer tank, and the water supply tank, the dry powder tank and the buffer tank are all connected with a nitrogen source; The dry powder tank is sequentially connected with a feeder, a buffer container, a negative pressure jet and the buffer tank; the water supply tank is connected in sequence with a water supply pump and the negative pressure jet, and the water supply tank is further connected with a dilution water pump; The outlet of the buffer tank is connected to a mother liquid transfer pump, and an outlet of the mother liquid transfer pump is connected to an outlet of the dilution water pump.
The method for rapidly dispersing and diluting a powdery polymer in an offshore or alpine or faulty oil field according to claim 1, wherein the powdery polymer in the offshore or alpine or faulty oil field is rapidly dispersed, and the structure of the dilution system is Armored.
A powdery polymer rapid dispersion and dilution system for an offshore or alpine or faulty oil field according to claim 1 or 2, wherein the buffer vessel is a funnel.
A powdery polymer rapid dispersion, dilution system for an offshore or alpine or faulty oil field according to claim 3 wherein the funnel is a visual funnel.
The method for rapidly dispersing and diluting a powdery polymer in an offshore or alpine or faulty oil field according to claim 1 or 2, characterized in that the powdery polymer in the offshore or alpine or fault block oil field is rapidly dispersed and the dilution system is further The automatic control module includes a PLC controller and a host computer, and the PLC controller is connected to the upper computer; electromagnetic flow is provided on a pipeline between the water supply pump and the negative pressure jet The meter, the pressure transmitter and the electric valve are connected to the PLC controller.
The method for rapidly dispersing and diluting a powdery polymer in an offshore or alpine or faulty oil field according to claim 5, wherein an electric valve is disposed between the water supply tank and the nitrogen source, and the electric valve and the electric valve are Connected to the PLC controller, an electric valve is disposed between the dry powder tank and the nitrogen source, the electric valve is connected to the PLC controller, and an electric valve is disposed between the buffer tank and the nitrogen source, An electric valve is coupled to the PLC controller.
The powdery polymer of the offshore or alpine or faulty oil field according to claim 5 is rapidly dispersed and diluted The discharge system is characterized in that an electric valve, an electromagnetic flowmeter and a pressure transmitter are arranged on the output pipeline of the dilution water pump, and the electric valve, the electromagnetic flowmeter and the pressure transmitter are all connected with the PLC controller.
The method for rapidly dispersing and diluting a powdery polymer in an offshore or alpine or faulty oil field according to claim 6 or 7, wherein the output line of the mother liquid delivery pump is provided with an electric valve, an electromagnetic flowmeter and a pressure. The transmitter, the electric valve, the electromagnetic flowmeter and the pressure transmitter are all connected to the PLC controller.
The method for rapidly dispersing and diluting a powdery polymer in an offshore or alpine or faulty oil field according to claim 6 or 7, wherein the water supply tank is provided with a temperature transmitter and a liquid level transmitter, The temperature transmitter and the liquid level transmitter are both connected to the PLC controller; the buffer tank is provided with a liquid level transmitter and a pressure transmitter, and the liquid level transmitter and the pressure transmitter are both The PLC controller is connected.
The powdery polymer rapid dispersion and dilution system for an offshore or alpine or faulty oil field according to claim 1 or 2, wherein the buffer tank, the buffer tank and the mother liquid transfer pump are between the tubes Both the road and the output line of the mother liquid transfer pump are made of 316L stainless steel.