CN111285532A - Corrosion inhibitor-containing gas field water reinjection treatment device and process - Google Patents

Corrosion inhibitor-containing gas field water reinjection treatment device and process Download PDF

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Publication number
CN111285532A
CN111285532A CN201911347092.XA CN201911347092A CN111285532A CN 111285532 A CN111285532 A CN 111285532A CN 201911347092 A CN201911347092 A CN 201911347092A CN 111285532 A CN111285532 A CN 111285532A
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China
Prior art keywords
water
air
corrosion inhibitor
transverse flow
coalescence
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Pending
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CN201911347092.XA
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Chinese (zh)
Inventor
舒志明
陈忠喜
赵秋实
孙秀秀
王可达
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Daqing Oilfield Design Institute Co ltd
Petrochina Co Ltd
Daqing Oilfield Co Ltd
Original Assignee
Petrochina Co Ltd
Daqing Oilfield Engineering Co Ltd
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Priority to CN201911347092.XA priority Critical patent/CN111285532A/en
Publication of CN111285532A publication Critical patent/CN111285532A/en
Pending legal-status Critical Current

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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00Multistage treatment of water, waste water or sewage
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/001Processes for the treatment of water whereby the filtration technique is of importance
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/24Treatment of water, waste water, or sewage by flotation
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/40Devices for separating or removing fatty or oily substances or similar floating material
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/48Treatment of water, waste water, or sewage with magnetic or electric fields
    • C02F1/481Treatment of water, waste water, or sewage with magnetic or electric fields using permanent magnets
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/52Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00Specific treatment goals
    • C02F2303/08Corrosion inhibition

Abstract

The invention discloses a gas field water reinjection treatment device containing a corrosion inhibitor, belonging to the technical field of gas field produced water treatment. The treatment device comprises a transverse flow coalescence-air floatation combined device, a primary double-layer filter and a secondary double-layer filter; the cross-flow coalescence-air-flotation device comprises a cross-flow coalescer and an air-flotation reactor; the processing method comprises the following steps: 1) the gas field water containing the corrosion inhibitor enters a coalescence area of a transverse flow coalescence-air floatation combined device for coalescence and separation; 2) the effluent of the coalescence zone enters an air-floating filler zone for air-floating separation, the effluent of air-floating enters an effluent zone, and the gravity flow enters a pre-filtration buffer tank; pumping the flowing water back by a gas-liquid multiphase pump, and allowing the gas-water mixed solution to enter a gas dissolving tank for full dissolution and then enter a gas floating water inlet area; the effluent of the buffer tank before filtration is boosted by a booster pump before filtration to enter a primary and secondary double-layer filter, and then is conveyed to a water injection station. The device and the process can treat the gas field water containing the corrosion inhibitor to reach the water quality index of oilfield reinjection water, and are used for reinjection of oilfield oil reservoirs.

Description

Corrosion inhibitor-containing gas field water reinjection treatment device and process
Technical Field
The invention relates to the technical field of gas field produced water treatment, in particular to a gas field water reinjection treatment device and process containing a corrosion inhibitor.
Background
With the rapid increase of energy demand in China, the exploration, development and production of natural gas resources are increasingly prominent in the energy strategy in China. During the natural gas production process, certain gas field produced water is produced. The water type of the produced water of the gas field is relatively complex (water type such as magnesium chloride, sodium bicarbonate and the like), and the produced water of the gas field containing the corrosion inhibitor has high emulsification degree compared with the produced water of the oil field and is not subjected to demulsification treatment.
At present, the treatment method of the produced water of the gas field mainly comprises the following steps: ineffective recharge, standard reaching discharge after treatment and comprehensive utilization (as salt chemical raw materials). Most of the produced water of gas fields in China is ineffective recharge (injection of gas production depleted wells, abandoned wells or abandoned strata). The typical treatment process of ineffective recharge is sedimentation and rough filtration, and the control index is wider. In order to make the produced water of the gas field reach the standard and be discharged outside, domestic related workers have made many beneficial exploratory studies, but the proposed process is basically not implemented well on site due to large investment, high cost, immature technology, complex operation and the like. The produced water of the gas field is boiled to salt in the Sichuan gas field, and the salt boiling treatment is stopped at present due to high energy consumption.
Therefore, at present, the reinjection treatment of the gas field water containing the corrosion inhibitor is not reported.
Disclosure of Invention
The invention aims to overcome the defects in the background technology and provides a gas field water reinjection treatment device containing a corrosion inhibitor, which can treat gas field water containing the corrosion inhibitor to reach the water quality index of oil field reinjection water and is used for oil field oil reservoir reinjection. The invention also provides a reinjection treatment process for the gas field water containing the corrosion inhibitor.
The invention can solve the problems by the following technical scheme: a reinjection treatment device for corrosion inhibitor-containing gas field water comprises a transverse flow coalescence-air floatation combined device, wherein the transverse flow coalescence-air floatation combined device comprises a transverse flow coalescer and an air floatation reactor; the transverse flow coalescer is divided into an oil discharge area, a filler area and a transverse flow mud accumulation area by an upper pressing plate and a lower pressing plate of coalescing fillers; the left side and the right side of the transverse flow coalescer are provided with a water distribution perforated plate; one side of the transverse flow coalescer is provided with a transverse flow water distribution chamber; the air flotation reactor is divided into an oil discharge area, a filling area and an air flotation mud accumulation area by an inclined plate filling upper pressing plate and an inclined plate filling lower pressing plate; an air floatation water distribution chamber is arranged between the transverse flow coalescer and the air floatation reactor; a water outlet area is arranged at the other side of the air floatation reactor; the middle part of the outer side of the transverse flow water distribution chamber is connected with a water inlet; the water outlet pipeline of the water outlet area of the transverse flow coalescence-air floatation combined device is connected with a pre-filtration buffer tank; the water outlet pipeline of the pre-filtering buffer tank is sequentially connected with the primary double-layer filter and the secondary double-layer filter through a pre-filtering booster pump, and the water outlet pipeline of the secondary double-layer filter is connected with the water injection station.
Oil receiving grooves are arranged at the top of the transverse flow water distribution chamber, the oil discharge area of the transverse flow coalescer and the oil discharge area of the air floatation reactor; oil scrapers are arranged in the oil discharge area of the cross-flow coalescer and the oil discharge area of the air flotation reactor.
The water outlet zone backflow water pipeline is connected with an inlet pipeline of a gas-liquid multiphase pump, an outlet pipeline of the gas-liquid multiphase pump is connected with a dissolved air pump, and a pipeline at the top of the dissolved air pump is connected with a dissolved air releaser in the air floatation water distribution chamber.
The invention also provides a reinjection treatment method of the gas field water containing the corrosion inhibitor, which comprises the following steps:
1) firstly, the gas field water containing the corrosion inhibitor passes through a tubular mixer (a flocculating agent and a coagulant aid are respectively added at the front end and the rear end of the tubular mixer), then enters a transverse flow water distribution chamber of a water inlet reaction zone of a transverse flow coalescence-air floatation combined device, and enters a coalescence zone filler zone through a water distribution perforated plate for coalescence and separation;
2) the effluent of the coalescence zone enters a filling zone of an air floatation zone for air floatation separation, the effluent of the air floatation enters an effluent zone, and the gravity flow enters a buffer tank before filtration; the return water of air floatation is taken from a water outlet area, the flowing water is taken back by an air-liquid multiphase pump, the air enters the air-liquid multiphase pump by the self-priming capacity of the air-liquid multiphase pump, and the air-water mixed liquid enters a dissolved air tank for full dissolution and then enters an air floatation water inlet area of a transverse flow coalescence-air floatation device;
3) the effluent of the pre-filtering buffer tank is boosted by a pre-filtering booster pump and enters a primary double-layer filter, the excess pressure of the effluent of the primary double-layer filter enters a secondary double-layer filter, and the effluent of the secondary double-layer filter is directly conveyed to a water injection station by virtue of the excess pressure; the water quality after treatment meets the water-flooding low-permeability water injection water quality index requirement;
4) the oil (slag) scraper and the sludge accumulation area are arranged in the gathering area and the air floating area for oil and sludge discharge.
The reflux ratio of the flowing water withdrawn by the gas-liquid multi-phase pump is 20 percent;
the filter material of the primary double-layer filter is a glauconite filter material and a magnetite filter material; the specification of the primary double-layer filter glauconite filter material is 0.8-1.2 mm, and the thickness is 400 mm; the specification of the magnetite filter material is 0.4-0.8 mm, the thickness is 400mm, and the filtering speed is 12 m/h;
the filter material of the secondary double-layer filter is quartz sand filter material and magnetite filter material; the specification of the quartz sand filter material of the secondary double-layer filter is 0.5-0.8 mm, and the thickness is 400 mm; the specification of the magnetite filter material is 0.25-0.5 mm, the thickness is 400mm, and the filtering speed is 8 m/h.
Compared with the background technology, the invention has the following beneficial effects:
the gas field water reinjection treatment device and process with the corrosion inhibitor can treat the gas field water with the corrosion inhibitor to meet the requirement of oil field reinjection water quality index (SY/T5329 and 2012 'water quality index and analysis method for clastic rock oil reservoir water injection'), and the treated water is used for reinjection of oil field oil reservoirs and is not discharged to the environment. The corrosion of the reinjection water treated by the process to oil field pipelines and equipment is not greater than that of oil field produced water, and scaling is avoided.
Drawings
FIG. 1 is a schematic process flow diagram of the present invention;
FIG. 2 is a schematic process flow diagram of the cross-flow coalescence-air-flotation device of the present invention.
In the figure: 1. a water inlet energy dissipation plate; 2. an oil (slag) receiving tank; 3. a water inlet reaction zone; 4. a water distribution perforated plate; 5. a coalescent pack press plate; 6. a coalescing filler; 7. a cross-flow sludge accumulation zone; 8. oil (slag) scrapers; 9. an air floatation water distribution area; 10. a dissolved air releaser; 11. adjusting the weir; 12. the inclined plate is filled with a pressure plate; 13. air flotation filling; 14. an air floatation mud accumulation area; 15. a water outlet area; 16. a gas-liquid multiphase pump; 17. and (4) a dissolved air tank.
Detailed Description
The present invention will be further described with reference to the following drawings and examples, but the present invention is not limited to the following examples.
Example 1
The treatment device and the treatment process for reinjection of the gas field water containing the corrosion inhibitor are adopted to treat the gas field water containing the corrosion inhibitor in a certain gas field, and the treatment capacity is 1.0m3The total effective retention time of the transverse flow coalescence-air floatation device is 3 hours, the adding amount of the flocculating agent is 50mg/L, and the adding amount of the coagulant aid is 2 mg/L; the filter material of the primary double-layer filter is a glauconite filter material (the specification is 0.8-1.2 mm, the thickness is 400 mm) and a magnetite filter material (the specification is 0.4-0.8 mm, the thickness is 400 mm), and the filtering speed is 12 m/h; the filter material of the secondary double-layer filter is quartz sand filter material (specification is 0.5-0.8 mm, thickness is 400 mm) and magnetite filter material (specification is 0.25-0.5 mm, thickness is 400 mm), and the filtering speed is 8 m/h.
The corrosion inhibitor-containing gas field water reinjection treatment device comprises a transverse flow coalescence-air floatation device, a primary double-layer filter and a secondary double-layer filter; the cross-flow coalescence-air-flotation device comprises a cross-flow coalescer and an air-flotation reactor; the transverse flow coalescer is divided into an oil discharge area, a filler area and a transverse flow mud accumulation area 7 by an upper coalescence filler pressing plate 5 and a lower coalescence filler pressing plate 5; the left side and the right side of the transverse flow coalescer are provided with a water distribution perforated plate 4; one side of the transverse flow coalescer is provided with a transverse flow water distribution chamber 3; the air flotation reactor is divided into an oil discharge area, a filling area and an air flotation mud accumulation area 14 by an upper inclined plate filling pressing plate 12 and a lower inclined plate filling pressing plate 12; an air-floatation water distribution chamber 9 is arranged between the transverse flow coalescer and the air-floatation reactor; a water outlet area 15 is arranged at the other side of the air floatation reactor; the middle part of the outer side of the transverse flow water distribution chamber 3 is connected with a water inlet, and the water inlet is provided with a water inlet energy dissipation plate 1; the top parts of the air floatation water distribution chamber 9 and the water outlet area 15 are provided with adjusting weirs 11; the top of the transverse flow water distribution chamber 3, the oil discharge area of the transverse flow coalescer and the oil discharge area of the air flotation reactor are provided with an oil (slag) collecting groove 2; the oil discharge area of the cross flow coalescer and the oil discharge area of the air flotation reactor are provided with an oil (slag) scraper 8; a return water pipeline of the water outlet area 15 is connected with an inlet pipeline of a gas-liquid multiphase pump 16, an outlet pipeline of the gas-liquid multiphase pump 16 is connected with a dissolved air tank 17, and a pipeline at the top of the dissolved air tank 17 is connected with a dissolved air releaser 10 in an air floatation water distribution chamber; the lateral flow coalescer packing region is filled with coalescing packing 6; the filling area of the air flotation reactor is filled with air flotation sloping plate filling 13; the water outlet pipeline of the water outlet area of the transverse flow coalescence-air floatation combined device is connected with a pre-filtration buffer tank; the water outlet pipeline of the pre-filtering buffer tank is sequentially connected with the primary double-layer filter and the secondary double-layer filter through a pre-filtering booster pump, and the water outlet pipeline of the secondary double-layer filter is connected with the water injection station.
The reinjection treatment process for the gas field water containing the corrosion inhibitor comprises a transverse flow coalescence-air floatation combined device, a primary double-layer filter and a secondary double-layer filter, can be used for reinjection treatment of the gas field water containing the corrosion inhibitor, and comprises the following steps:
firstly, the gas field water containing the corrosion inhibitor firstly passes through a tubular mixer (a flocculating agent and a coagulant aid are respectively added at the front end and the rear end of the tubular mixer), then enters a transverse flow water distribution chamber of a water inlet reaction zone of a transverse flow coalescence-air floatation combined device, enters a packing zone of a coalescence zone through a water distribution perforated plate for coalescence and separation,
secondly, the effluent gravity flow of the coalescence zone enters a filling zone of an air floatation zone for air floatation separation, the effluent water of the air floatation zone enters an effluent zone, and the gravity flow enters a buffer tank before filtration; taking the return water of air floatation from a water outlet area, pumping the return water by using a gas-liquid multiphase pump (the reflux ratio is 20%), feeding air into the gas-liquid multiphase pump by using the self-absorption capacity of the gas-liquid multiphase pump, feeding the gas-water mixed liquid into a gas dissolving tank for fully dissolving, and then feeding the gas-water mixed liquid into an air floatation water inlet area of a transverse flow coalescence-air floatation combined device;
and thirdly, the effluent of the buffer tank before filtration is boosted by a booster pump before filtration and enters a primary double-layer filter (pressure type), the effluent residual pressure of the primary double-layer filter enters a secondary double-layer filter, and the effluent of the secondary double-layer filter is directly conveyed to a water injection station by the residual pressure. The water quality after treatment meets the water-flooding low-permeability water injection water quality index (oil content is less than or equal to 8mg/L, suspended solid content is less than or equal to 3mg/L, and median particle diameter is less than or equal to 2 mu m).
And fourthly, an oil (slag) scraper and a sludge accumulation area are arranged in the gathering area and the air floatation area, and oil (continuous oil) and sludge (once in a period of 3 d) are periodically discharged.
The total effective retention time of the transverse flow coalescence-air floatation combined device in the first step and the second step is 1-3 h. The addition amount of the flocculating agent is 50-130 mg/L, and the addition amount of the coagulant aid is 1-3 mg/L.
The process can treat the gas field water containing the corrosion inhibitor to meet the requirements of SY/T5329 and 2012 'water injection quality index and analysis method for clastic rock oil reservoirs'. The treated water is used for oil field oil reservoir reinjection and is not discharged to the environment. The corrosion of the reinjection water treated by the process to oil field pipelines and equipment is not greater than that of oil field produced water, and scaling is avoided.

Claims (10)

1. The utility model provides a contain corrosion inhibitor gas field water reinjection processing apparatus, includes cross flow coalescence-air supporting composite set, its characterized in that: the transverse flow coalescence-air floatation combined device comprises a transverse flow coalescer and an air floatation reactor; the transverse flow coalescer is divided into an oil discharge area, a filler area and a transverse flow mud accumulation area by an upper pressing plate and a lower pressing plate of coalescing fillers; the left side and the right side of the transverse flow coalescer are provided with a water distribution perforated plate; one side of the transverse flow coalescer is provided with a transverse flow water distribution chamber; the air flotation reactor is divided into an oil discharge area, a filling area and an air flotation mud accumulation area by an inclined plate filling upper pressing plate and an inclined plate filling lower pressing plate; an air floatation water distribution chamber is arranged between the transverse flow coalescer and the air floatation reactor; a water outlet area is arranged at the other side of the air floatation reactor; the middle part of the outer side of the transverse flow water distribution chamber is connected with a water inlet; the water outlet pipeline of the water outlet area of the transverse flow coalescence-air floatation combined device is connected with a pre-filtration buffer tank; the water outlet pipeline of the pre-filtering buffer tank is sequentially connected with the primary double-layer filter and the secondary double-layer filter through a pre-filtering booster pump, and the water outlet pipeline of the secondary double-layer filter is connected with the water injection station.
2. The corrosion inhibitor-containing gas field water reinjection treatment device according to claim 1, wherein: oil receiving grooves are arranged at the top of the transverse flow water distribution chamber, the oil discharge area of the transverse flow coalescer and the oil discharge area of the air floatation reactor; oil scrapers are arranged in the oil discharge area of the cross-flow coalescer and the oil discharge area of the air flotation reactor.
3. The corrosion inhibitor-containing gas field water reinjection treatment device according to claim 1, wherein: the return water pipeline of the water outlet zone is connected with an inlet pipeline of a gas-liquid multiphase pump, an outlet pipeline of the gas-liquid multiphase pump is connected with a dissolved air pump, and a pipeline at the top of the dissolved air pump is connected with a dissolved air releaser in the air-flotation water distribution chamber.
4. A method for reinjection treatment of gas field water containing corrosion inhibitor by using the device according to claim 1, wherein: the method comprises the following steps:
1) the corrosion inhibitor-containing gas field water firstly passes through a tubular mixer and then enters a transverse flow water distribution chamber of a water inlet reaction zone of a transverse flow coalescence-air floatation combined device, and enters a coalescence zone filler zone through a water distribution perforated plate for coalescence and separation;
2) the effluent of the coalescence zone enters a filling zone of an air floatation zone for air floatation separation, the effluent of the air floatation enters an effluent zone, and the gravity flow enters a buffer tank before filtration; the return water of air floatation is taken from a water outlet area, the flowing water is taken back by an air-liquid multiphase pump, the air enters the air-liquid multiphase pump by the self-priming capacity of the air-liquid multiphase pump, and the air-water mixed liquid enters a dissolved air tank for full dissolution and then enters an air floatation water inlet area of the transverse flow coalescence-air floatation combined device;
3) the effluent of the pre-filtering buffer tank is boosted by a pre-filtering booster pump and enters a primary double-layer filter, the excess pressure of the effluent of the primary double-layer filter enters a secondary double-layer filter, and the effluent of the secondary double-layer filter is directly conveyed to a water injection station by virtue of the excess pressure; the water quality after treatment meets the water-flooding low-permeability water injection water quality index requirement;
4) the oil (slag) scraper and the sludge accumulation area are arranged in the gathering area and the air floating area for oil and sludge discharge.
5. The corrosion inhibitor-containing gas field water reinjection treatment process according to claim 4, characterized in that: the reflux ratio of the flowing water is withdrawn by a gas-liquid multiphase pump.
6. The corrosion inhibitor-containing gas field water reinjection treatment process according to claim 4, characterized in that: the filter material of the primary double-layer filter is a glauconite filter material and a magnetite filter material, and the filtering speed is 10-12 m/h.
7. The corrosion inhibitor-containing gas field water reinjection treatment process according to claim 6, characterized in that: the specification of the primary double-layer filter glauconite filter material is 0.8-1.2 mm, and the thickness is 400 mm; the specification of the magnetite filter material is 0.4-0.8 mm, and the thickness is 400 mm.
8. The corrosion inhibitor-containing gas field water reinjection treatment process according to claim 4, characterized in that: the secondary double-layer filter is a quartz sand filter material and a magnetite filter material; the filtration speed is 6-8 m/h.
9. The corrosion inhibitor-containing gas field water reinjection treatment process according to claim 8, characterized in that: the specification of the quartz sand filter material of the secondary double-layer filter is 0.5-0.8 mm, and the thickness is 400 mm; the specification of the magnetite filter material is 0.25-0.5 mm, and the thickness is 400 mm.
10. The corrosion inhibitor-containing gas field water reinjection treatment process according to claim 4, characterized in that: respectively adding a flocculating agent and a coagulant aid into the front end and the rear end of the tubular mixer; the addition amount of the flocculating agent is 50-130 mg/L, and the addition amount of the coagulant aid is 1-3 mg/L.
CN201911347092.XA 2019-12-24 2019-12-24 Corrosion inhibitor-containing gas field water reinjection treatment device and process Pending CN111285532A (en)

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