CN111072210B - Oil field reinjection water multi-station combined treatment system and method - Google Patents

Oil field reinjection water multi-station combined treatment system and method Download PDF

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CN111072210B
CN111072210B CN201911381217.0A CN201911381217A CN111072210B CN 111072210 B CN111072210 B CN 111072210B CN 201911381217 A CN201911381217 A CN 201911381217A CN 111072210 B CN111072210 B CN 111072210B
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water
reinjection water
reinjection
station
injection
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CN111072210A (en
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李桂亮
李长俊
班久庆
韦南
陈玉麟
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Southwest Petroleum University
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/02—Treatment of water, waste water, or sewage by heating
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities

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  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
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Abstract

The invention provides a multi-station combined treatment system and method for oilfield reinjection water. The oil field reinjection water multi-station combined treatment system and the method comprise the following steps: the system comprises a reinjection water heating device, a reinjection water heating bypass device, a reinjection water return conveying device of a water injection station, a reinjection water return conveying bypass device, a reinjection water injection stratum device, a combined station and a water injection station; and one side of the reinjection water heating device is connected with the combined station. The oil field reinjection water multi-station combined treatment system and the method thereof inhibit new separation and coalescence growth of suspended solids by improving the conveying temperature and flow rate of the reinjection water from the combined station to the water injection station, thereby realizing the aim that the content and the median of the suspended solids at the wellhead of the water injection well meet the reinjection requirements; the regulation of the output flow rate and the temperature of the reinjection water is further realized, the problem that the water quality of the wellhead of the reinjection water in the oil field does not reach the standard is solved, and the method has the characteristics of flexible regulation of working conditions, simple process flow and stable water physical property.

Description

Oil field reinjection water multi-station-yard combined treatment system and method
Technical Field
The invention relates to the field of oilfield reinjection water treatment, in particular to a system and a method for multi-station combined treatment of oilfield reinjection water.
Background
Water flooding is a commonly used oilfield development scheme for oil fields. According to the statistics of the OPEC organization, the daily oil consumption all over the world is about 89.4 multiplied by 106Barrels per day, while the water content of oil fields generally exceeds 75 percent, and the water content of part of old oil fields even exceeds 95 percent; in China, according to statistics of China Petroleum Korea big rack academicians and China petrochemical Liyang academicians, the crude oil yield in China exceeds 1.9 multiplied by 108The water content of the oil field is over 86.0%, and the water content of part of the old oil field is over 90%. Therefore, in the development of oil fields, the problem of treating a large amount of produced water is faced.
To maintain formation pressure balance and to avoid the impact of produced water on the local environment, oil fields typically treat qualified produced water (i.e., reinjection water) back into the formation. According to the recommendation index and analysis method for water injection quality of clastic rock oil reservoirs (SY/T5329-2012), the oil content, the content of suspended solids and the median diameter of particles in the reinjection water are controlled to meet the reinjection requirements of oil reservoirs with different geological types. If the reinjection water contains a large amount of solid suspended matters with large particle sizes, the formation pores can be blocked, the oil field recovery rate is reduced, and the economic benefit of the oil field is reduced. Therefore, the oil field treats the produced water through a united station or a sewage treatment station, so that the oil content, the suspended solid content and the median particle size of the produced water meet the reinjection requirement.
However, in the process of conveying the reinjection water from the combined station to the water injection well, the solubility of suspended solids is reduced and the suspended solids are continuously precipitated and grown due to the temperature drop of the reinjection water along the way; the turbulent action of the water flow also causes the solid particles to continuously collide and coalesce to form solid suspensions with large particle sizes. Therefore, under the action, when the reinjection water is conveyed to the wellhead of the water injection well, the content of suspended solids and the median particle size can cause the problem that the reinjection requirement is not met.
In contrast, the oil field often adopts a method for improving the quality of the outlet water of the combined station, for example, the method is changed into a method for improving the coagulation and coagulation aiding effects, and deep membrane filtration technologies such as ultrafiltration membranes and nanofiltration membranes are adopted or filtration stages are added to remove large-particle-size particles in the reinjection water so as to improve the quality of the reinjection water. However, these methods do not consider the technical idea of adjusting the temperature and flow rate of the recycled water.
Therefore, it is necessary to provide a system and a method for multi-site combined treatment of oilfield reinjection water to solve the above technical problems.
Disclosure of Invention
The invention provides a multi-station combined treatment system and a multi-station combined treatment method for oilfield reinjection water, which solve the problem that the content of suspended solids and the median of particle sizes do not meet the reinjection requirement.
In order to solve the technical problem, the oil field reinjection water multi-station combined treatment system provided by the invention comprises:
the system comprises a reinjection water heating device, a reinjection water heating bypass device, a reinjection water returning device of a water injection station, a reinjection water returning bypass device, a reinjection water injection stratum device, a combined station and a water injection station;
one side of the reinjection water heating device is connected with the combined station, the other side of the reinjection water heating device is communicated with a reinjection water external transmission pipeline (PL1), the other end of the reinjection water external transmission pipeline (PL1) is connected with the water injection station, and the reinjection water heating bypass device is connected with the reinjection water heating device;
the water injection station is respectively connected with the water injection station water injection return device, the water injection return bypass device and the water injection stratum device, the water injection return bypass device is connected with the water injection station water injection return device, the water injection station water injection return device is connected with a water injection return pipeline (PL2), and the other end of the water injection return pipeline (PL2) is connected with the united station.
Preferably, the reinjection water heating device includes two sets of a Gate Valve (GV), a Heating Furnace (HF), a Thermometer (TM), a Gate Valve (GV), a Check Valve (CV), and a flow meter (FW).
Preferably, the recirculated water heating bypass device includes a Gate Valve (GV) and a Check Valve (CV), and the Gate Valve (GV) and the Check Valve (CV) are connected in this order.
Preferably, the water feedback device comprises two sets of Gate Valves (GV), a low-pressure feedback pump (LRP), a Pressure Gauge (PG), a Gate Valve (GV), a Check Valve (CV) and a flow meter (FW).
Preferably, the injection water return bypass device comprises a Gate Valve (GV) and a Check Valve (CV), and the Gate Valve (GV) and the Check Valve (CV) are connected in sequence.
Preferably, the reinjection water into the formation device comprises a Gate Valve (GV), a high pressure injection pump (HPP), a Pressure Gauge (PG), a Gate Valve (GV), a Check Valve (CV) and a Flow Meter (FM).
Preferably, two sets of Gate Valve (GV), Heating Furnace (HF), Thermometer (TM), Gate Valve (GV), Check Valve (CV) and Flowmeter (FW) are connected in sequence in the reinjection water heating apparatus.
Preferably, two groups of Gate Valves (GV), low-pressure return pumps (LRP), Pressure Gauges (PG), Gate Valves (GV), Check Valves (CV) and flow meters (FW) in the return water and return water conveying device are connected in sequence.
Preferably, a Gate Valve (GV), a high-pressure injection pump (HPP), a Pressure Gauge (PG), the Gate Valve (GV), a Check Valve (CV) and a Flow Meter (FM) in the reinjection water injection stratum device are connected in sequence.
A method for a multi-station combined treatment system of oilfield reinjection water comprises the following steps:
s1, opening a Gate Valve (GV) and a Screwing Valve (SV) in the reinjection water heating device, closing a Ball Valve (BV), starting a Heating Furnace (HF), enabling the two groups of heating devices to be in independent working states, and then closing the Gate Valve (GV) of the reinjection water heating bypass device to be in a shutdown working state;
s2, enabling the reinjection water discharged from the combined station to flow to a Heating Furnace (HF) through a Gate Valve (GV), carrying out temperature detection and recording temperature data through a Thermometer (TM) after heating, detecting flow rate and recording flow rate data through a Flow Meter (FM), and outputting the heated reinjection water to a water injection station through a reinjection water output pipeline (PL 1);
s3, opening a Gate Valve (GV) and a Screwing Valve (SV) in the reinjection water feedback device, closing a Ball Valve (BV), starting a low-pressure feedback pump (LRP), enabling the two groups of feedback devices to be in independent working states, and closing a Gate Valve (GV) of the reinjection water feedback bypass device to be in a shutdown working state;
s4, enabling part of reinjection water of the water injection station to flow to a low-pressure feedback pump (LRP) through a Gate Valve (GV), carrying out pressure detection and recording pressure data through a Pressure Gauge (PG) after pressurization, detecting flow rate and recording flow rate data through a Flow Meter (FM), and feeding the reinjection water after pressurization back to a combined station through a reinjection water feedback pipeline (PL 2);
s5, opening a Gate Valve (GV) in the device for injecting reinjection water into the stratum, starting a high-pressure injection pump (HPP), enabling the high-pressure reinjection water to be in a working state, enabling reinjection water which is not returned to the water injection station to flow to the high-pressure injection pump (HPP) through the Gate Valve (GV), carrying out pressure detection and recording pressure data through a Pressure Gauge (PG) after pressurization, detecting flow rate through a Flow Meter (FM) and recording flow rate data, and enabling the reinjection water after pressurization to flow to a water injection well and finally reinject to the stratum.
Compared with the related technology, the oil field reinjection water multi-station combined treatment system and the method provided by the invention have the following beneficial effects:
the invention provides a multi-station combined treatment system and a method for oilfield reinjection water, wherein a reinjection water heating process device is newly built at an outlet of a combined station, the temperature of the reinjection water is increased through a heating furnace, and the solubility of suspended solids in the reinjection water is increased, so that the reinjection water is not easy to separate out; newly building a reinjection water return pipeline between the combined station and the water injection station; a water injection return process device is newly built in a water injection station, and partial return water is returned to a combined station through a return pump so as to meet the requirement of the vacancy of the required return water flow rate when the flow rate of the return water is increased, so that the flow rate of the return water can be increased, the return water enters a flow interval of strong turbulence, the shearing action of a flow field is enhanced, the coalescence of solid suspended matters is inhibited, and the breakage of large-particle solid suspended matters is promoted; therefore, the reinjection water is subjected to water temperature improvement and flow velocity improvement treatment, so that new separation and aggregation and growth of solid suspended matters in the reinjection water can be inhibited, and the content and the median of the particle size of the solid suspended matters at the wellhead of the water injection well meet the reinjection requirements; the regulation of the output flow rate and the temperature of the reinjection water is further realized, the problem that the water quality of the wellhead of the reinjection water in the oil field does not reach the standard is solved, and the method has the characteristics of flexible regulation of working conditions, simple process flow and stable water physical property.
Drawings
FIG. 1 is a schematic structural diagram of a preferred embodiment of a multi-site combined treatment system for oilfield reinjection water provided by the present invention;
FIG. 2 is a schematic structural view of a heating furnace provided by the present invention;
fig. 3 is a structural sectional view of the heating structure shown in fig. 2.
Reference numbers in the figures: 1. the device comprises a reinjection water heating device, 2, a reinjection water heating bypass device, 3, a reinjection water returning bypass device, 4, a reinjection water returning bypass device, 5, a reinjection water injection stratum device, 6, a combination station, 7, a water injection station, 8, a shell, 9, a V-shaped plate, 10, a heating structure, 101, a heat conducting sleeve, 102, a heat conducting rod, 103, a heating wire, 11, a heat exchange tube, 12, a hot oil tank, 13, a hot oil pump, 14 and a heat conducting tube.
Detailed Description
The invention is further described below with reference to the drawings and the embodiments.
Referring to fig. 1, fig. 2 and fig. 3, wherein fig. 1 is a schematic structural diagram of a preferred embodiment of a multi-site combined treatment system for oilfield reinjection water provided by the present invention; FIG. 2 is a schematic view of a structure of a heating furnace provided by the present invention; fig. 3 is a structural sectional view of the heating structure shown in fig. 2. The oil field reinjection water multi-station combined treatment system and the method comprise the following steps:
the system comprises a reinjection water heating device 1, a reinjection water heating bypass device 2, a reinjection water returning device 3 of a water injection station, a reinjection water returning bypass device 4, a reinjection water injection stratum device 5, a combined station 6 and a water injection station 7;
one side of the reinjection water heating device 1 is connected with the combined station 6, the other side of the reinjection water heating device 1 is communicated with a reinjection water external transmission pipeline (PL1), and the other end of the reinjection water external transmission pipeline (PL1) is connected with the water injection station 7;
the injection water return heating bypass device 2 is connected with the injection water return heating device 1, the water injection station 7 is respectively connected with the injection station injection water return device 3, the injection water return bypass device 4 and the injection water injection stratum device 5, the injection water return bypass device 4 is connected with the injection station injection water return device 3, the injection station injection water return device 3 is connected with an injection water return pipeline (PL2), and the other end of the injection water return pipeline (PL2) is connected with the combined station 6.
The reinjection water heating device 1 comprises two groups of Gate Valves (GV), a Heating Furnace (HF), a Thermometer (TM), Gate Valves (GV), a Check Valve (CV) and a Flowmeter (FW).
The recycled water heating bypass device 2 comprises a Gate Valve (GV) and a Check Valve (CV), and the Gate Valve (GV) and the Check Valve (CV) are connected in sequence.
The reinjection water return device 3 comprises two groups of Gate Valves (GV), a low-pressure return pump (LRP), a Pressure Gauge (PG), a Gate Valve (GV), a Check Valve (CV) and a Flowmeter (FW).
The return water return bypass device 4 comprises a Gate Valve (GV) and a Check Valve (CV), and the Gate Valve (GV) and the Check Valve (CV) are connected in sequence.
The reinjection water injection formation device 5 comprises a Gate Valve (GV), a high pressure injection pump (HPP), a Pressure Gauge (PG), a Gate Valve (GV), a Check Valve (CV) and a Flow Meter (FM).
Two groups of Gate Valves (GV), a Heating Furnace (HF), a Thermometer (TM), Gate Valves (GV), Check Valves (CV) and a Flowmeter (FW) in the reinjection water heating device 1 are connected in sequence.
And two groups of Gate Valves (GV), a low-pressure return pump (LRP), a Pressure Gauge (PG), Gate Valves (GV), Check Valves (CV) and a Flowmeter (FW) in the return water and return conveying device 3 are connected in sequence.
And the Gate Valve (GV), the high-pressure injection pump (HPP), the Pressure Gauge (PG), the Gate Valve (GV), the Check Valve (CV) and the Flow Meter (FM) in the reinjection water injection stratum device 5 are sequentially connected.
A method for a multi-station combined treatment system of oilfield reinjection water comprises the following steps:
s1, opening a Gate Valve (GV) and a Screwing Valve (SV) in the reinjection water heating device 1, closing a Ball Valve (BV), starting a Heating Furnace (HF), enabling the two groups of heating devices to be in independent working states, and then closing the Gate Valve (GV) of the reinjection water heating bypass device 2 to be in a stop working state;
s2, enabling the reinjection water discharged from the joint station 6 to flow to a Heating Furnace (HF) through a Gate Valve (GV), carrying out temperature detection and recording temperature data through a Thermometer (TM) after heating, detecting flow rate and recording flow rate data through a Flow Meter (FM), and externally conveying the reinjection water to a water injection station 7 through a reinjection water external conveying pipeline (PL1) by utilizing the residual pressure of the joint station after heating;
s3, opening a Gate Valve (GV) and a Screw Valve (SV) in the reinjection water feedback device 3, closing a Ball Valve (BV), starting a low-pressure feedback pump (LRP), enabling two groups of feedback devices to be in independent working states, and closing a Gate Valve (GV) of the reinjection water feedback bypass device 4 to enable the two groups of feedback devices to be in a stop working state;
s4, enabling part of reinjection water of the water injection station 7 to flow to a low-pressure feedback pump (LRP) through a Gate Valve (GV), carrying out pressure detection and recording pressure data through a Pressure Gauge (PG) after pressurization, detecting flow rate and recording flow rate data through a Flow Meter (FM), and enabling the reinjection water after pressurization to be fed back to the combined station 6 through a reinjection water feedback pipeline (PL 2);
s5, opening a Gate Valve (GV) in the reinjection water injection stratum device 5, starting a high-pressure injection pump (HPP) to enable the high-pressure reinjection to be in a working state, enabling reinjection water which is not reinjected in the water injection station 7 to flow to the high-pressure injection pump (HPP) through the Gate Valve (GV), carrying out pressure detection through a Pressure Gauge (PG) after pressurization and recording pressure data, and detecting flow rate through a Flow Meter (FM) and recording flow rate data;
and S6, the pressurized reinjection water flows to a water injection well and is finally reinjected to the stratum.
The invention also provides a heating furnace, which comprises a shell 8, wherein a V-shaped plate 9 is fixedly connected between two sides of the inner wall of the shell 8, a heating structure 10 is fixedly connected to the bottom of the inner wall of the shell 8, the heating structure 10 comprises a heat conduction sleeve 101, a heat conduction rod 102 is arranged between the top and the bottom of the inner wall of the heat conduction sleeve 101, a heating wire 103 is arranged between the top and the bottom of the inner wall of the heat conduction sleeve 101 and positioned on the outer surface of the heat conduction rod 102, the top of the V-shaped plate 9 is communicated with a heat exchange tube 11, one end of the heat exchange tube 11 penetrates through the shell 8 and extends to the outside of the shell 8, and the outer surface of the heat exchange tube 11 is wound on the outer surface of the heat conduction sleeve 101.
A hot oil tank 12 is fixedly connected to one side of the inner wall of the housing 8, a hot oil pump 13 is arranged at the top of the hot oil tank 12, a suction port of the hot oil pump 13 is communicated with the interior of the hot oil tank 12 through an absorption tube, an outlet of the hot oil pump 13 is communicated with a heat conduction pipe 14, one end of the heat conduction pipe 14 is communicated with the bottom of the hot oil tank 12, and the outer surface of the heat conduction pipe 14 is wound and connected with the outer surface of the heat conduction sleeve 101;
hot oil is arranged in the hot oil tank 12, is heated by a heating device in the hot oil tank 12, is absorbed by the hot oil pump 13 and is discharged into the heat conduction pipe 14, a water inlet pipe is arranged at the top of the shell 8 and is connected with an external water source for reinjection water, and the reinjection water is sucked into the shell 8 through the water inlet pipe and enters the heat exchange pipe 11;
enter into the inside of heat exchange tube 11 through the reinjection water to and enter into the inside of heat pipe 14 through hot oil, at this moment the inside temperature of heat pipe 14 will carry out the heat transfer with the reinjection water of heat exchange tube 11 inside, thereby accomplish the heating of reinjection water, easy operation, it is effectual to heat, can be quick heat the reinjection water.
The working principle of the oil field reinjection water multi-station combined treatment system and the method provided by the invention is as follows:
through the reinjection water heating device 1, different operation processes can be selected according to different requirements of the temperature of the external water output of the reinjection water; when the output temperature of the reinjection water is high, two groups of heating processes can be started simultaneously; when the requirement on the output temperature of the reinjection water is low, only one group of heating processes can be started; when the reinjection water does not need to be heated, the reinjection water can directly enter the reinjection water outward transmission pipeline PL1 through the reinjection water heating bypass device 2;
the maintenance of the Heating Furnace (HF) and the correction of the Flow Meter (FM) can be realized through the reinjection water heating device 1 according to different switch settings of a Gate Valve (GV) and a Ball Valve (BV); by closing the Gate Valves (GV) at the inlet and outlet of the Heating Furnace (HF), the Heating Furnace (HF) clamped by the two Gate Valves (GV) can be overhauled; the Flowmeter (FM) can be corrected by closing a Gate Valve (GV) at the inlet of the Flowmeter (FM) and opening a Ball Valve (BV), and the normal operation of the heating process flow is not influenced;
through the reinjection water return conveying device 3, corresponding operation processes can be selected according to different reinjection water return conveying quantity requirements; when a large amount of reinjection water is required to be fed back, two sets of feedback flows can be started simultaneously; when the requirement of the return flow of the injected water is low, only one group of return flow can be started; when the residual pressure of the reinjection water of the water injection station meets the requirement of the reinjection water, the reinjection water can directly enter a reinjection water return pipeline (PL2) through a reinjection water return bypass device 4;
the low-pressure return pump (LRP) maintenance and the Flowmeter (FM) correction can be realized through the return water injection and return conveying device 3 according to different switch settings of a Gate Valve (GV) and a Ball Valve (BV); the low-pressure return pump (LRP) between the two Gate Valves (GV) can be overhauled by closing the Gate Valves (GV) at the inlet and the outlet of the low-pressure return pump (LRP); the Flowmeter (FM) can be corrected by closing the Gate Valve (GV) at the inlet of the Flowmeter (FM) and opening the Ball Valve (BV), and the normal operation of the return process flow is not influenced.
Compared with the related technology, the oil field reinjection water multi-station combined treatment system and the method provided by the invention have the following beneficial effects:
a reinjection water heating process device is newly built at the outlet of the combined station 6, the temperature of the reinjection water is increased through a heating furnace, and the solubility of suspended solids in the reinjection water is increased, so that the reinjection water is not easy to separate out; newly building a reinjection water return pipeline between the combined station and the water injection station; a reinjection water feedback process device is newly built in a water injection station 7, and part of reinjection water is fed back to a combined station 6 through a feedback pump so as to meet the requirement of the vacancy of the reinjection water amount when the flow rate of the reinjection water is increased, so that the external transmission flow rate of the reinjection water can be increased, the reinjection water enters a strong turbulent flow interval, the shearing action of a flow field is enhanced, the coalescence of solid suspended matters is inhibited, and the breakage of large-particle solid suspended matters is promoted; therefore, the reinjection water is subjected to water temperature increasing and flow velocity increasing treatment, so that new separation and coalescence growth of suspended solids in the reinjection water can be inhibited, and the content and the median particle size of the suspended solids at the wellhead of the water injection well meet the reinjection requirement; the regulation of the output flow rate and the temperature of the reinjection water is further realized, the problem that the water quality of the wellhead of the reinjection water in the oil field does not reach the standard is solved, and the method has the characteristics of flexible regulation of working conditions, simple process flow and stable water physical property.
The above description is only an embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes performed by the present invention or directly or indirectly applied to other related technical fields are included in the scope of the present invention.

Claims (1)

1. A working method of an oilfield reinjection water multi-station combined treatment system, which is characterized in that,
the oil field reinjection water multi-station combined treatment system comprises:
the system comprises a reinjection water heating device, a reinjection water heating bypass device, a reinjection water returning device of a water injection station, a reinjection water returning bypass device, a reinjection water injection stratum device, a combined station and a water injection station;
one side of the reinjection water heating device is connected with the united station, the other side of the reinjection water heating device is communicated with a reinjection water external transmission pipeline (PL1), and the other end of the reinjection water external transmission pipeline (PL1) is connected with the water injection station;
the water injection station is respectively connected with the water injection station reinjection water return conveying device, the reinjection water return conveying bypass device and the reinjection water injection stratum device, the reinjection water return conveying bypass device is connected with the water injection station reinjection water return conveying device, the water injection station reinjection water return conveying device is connected with a reinjection water return conveying pipeline (PL2), and the other end of the reinjection water return conveying pipeline (PL2) is connected with the combined station;
the reinjection water heating device comprises two groups of Gate Valves (GV), a Heating Furnace (HF), a Thermometer (TM), Gate Valves (GV), a Check Valve (CV) and a Flowmeter (FW), and the two groups of Gate Valves (GV), the Heating Furnace (HF), the Thermometer (TM), the Gate Valves (GV), the Check Valve (CV) and the Flowmeter (FW) in the reinjection water heating device are connected in sequence;
the injection water return conveying device comprises two groups of Gate Valves (GV), a low-pressure return conveying pump (LRP), a Pressure Gauge (PG), a Gate Valve (GV), a Check Valve (CV) and a flow meter (FW), and the two groups of Gate Valves (GV), the low-pressure return conveying pump (LRP), the Pressure Gauge (PG), the Gate Valve (GV), the Check Valve (CV) and the flow meter (FW) in the injection water return conveying device are connected in sequence;
the reinjection water heating bypass device comprises a Gate Valve (GV) and a Check Valve (CV), and the Gate Valve (GV) and the Check Valve (CV) are connected in sequence;
the injection water return bypass device comprises a Gate Valve (GV) and a Check Valve (CV), and the Gate Valve (GV) and the Check Valve (CV) are connected in sequence;
the reinjection water injection formation device comprises a Gate Valve (GV), a high-pressure injection pump (HPP), a Pressure Gauge (PG), a Gate Valve (GV), a Check Valve (CV) and a Flow Meter (FM);
the Gate Valve (GV), the high-pressure injection pump (HPP), the Pressure Gauge (PG), the Gate Valve (GV), the Check Valve (CV) and the Flow Meter (FM) in the reinjection water injection stratum device are sequentially connected;
the working method of the oil field reinjection water multi-station-site combined treatment system comprises the following steps of:
s1, opening a Gate Valve (GV) and a Screwing Valve (SV) in the reinjection water heating device, closing a Ball Valve (BV), starting a Heating Furnace (HF) to enable two groups of heating devices to be in independent working states, and then closing the Gate Valve (GV) of the reinjection water heating bypass device to enable the reinjection water heating bypass device to be in a stop working state;
s2, enabling the reinjection water discharged from the combined station to flow to a Heating Furnace (HF) through a Gate Valve (GV), carrying out temperature detection and recording temperature data through a Thermometer (TM) after heating, detecting flow rate and recording flow rate data through a Flow Meter (FM), and externally conveying the reinjection water to a water injection station through a reinjection water external conveying pipeline (PL1) by utilizing the residual pressure of the combined station after heating;
s3, opening a Gate Valve (GV) and a Screwing Valve (SV) in the reinjection water feedback device, closing a Ball Valve (BV), opening a low-pressure feedback pump (LRP), enabling the two groups of feedback devices to be in independent working states, closing a Gate Valve (GV) of the reinjection water feedback bypass device, and enabling the reinjection water feedback bypass device to be in a stop working state;
s4, enabling part of reinjection water of the water injection station to flow to a low-pressure feedback pump (LRP) through a Gate Valve (GV), carrying out pressure detection and recording pressure data through a Pressure Gauge (PG) after pressurization, detecting flow rate and recording flow rate data through a Flow Meter (FM), and feeding the reinjection water after pressurization back to a combined station through a reinjection water feedback pipeline (PL 2);
s5, opening a Gate Valve (GV) in the device for injecting reinjection water into the stratum, starting a high-pressure injection pump (HPP) to enable the high-pressure reinjection water to be in a working state, enabling reinjection water which is not returned to a water injection station to flow to the high-pressure injection pump (HPP) through the Gate Valve (GV), carrying out pressure detection through a Pressure Gauge (PG) after pressurization and recording pressure data, and detecting flow rate through a Flow Meter (FM) and recording flow rate data;
and S6, the pressurized reinjection water flows to a water injection well and is finally reinjected to the stratum.
CN201911381217.0A 2019-12-27 2019-12-27 Oil field reinjection water multi-station combined treatment system and method Active CN111072210B (en)

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