CN113440889B - In-situ water diversion treatment method applied to oil field oil extraction well - Google Patents
In-situ water diversion treatment method applied to oil field oil extraction well Download PDFInfo
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- CN113440889B CN113440889B CN202110550473.9A CN202110550473A CN113440889B CN 113440889 B CN113440889 B CN 113440889B CN 202110550473 A CN202110550473 A CN 202110550473A CN 113440889 B CN113440889 B CN 113440889B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
- B01D17/02—Separation of non-miscible liquids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
- B01D17/02—Separation of non-miscible liquids
- B01D17/04—Breaking emulsions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
Abstract
The invention aims to provide an on-site water diversion treatment method applied to an oil extraction well of an oil-gas field, which can quickly and efficiently separate an extracted oil-water mixture on site, directly reinject the extracted oil-water mixture after sewage treatment reaches the standard, reduce the treatment cost of production sewage and lighten the pressure of an external conveying system and a joint station, and comprises the following steps that 1, a dosing device, an on-site water diversion device, a dirty oil water buffer tank and an external conveying booster pump are respectively hoisted beside the oil well through skid blocks, a special treatment agent is added through the dosing device, and then the object liquid produced by the oil well and the special treatment agent are mixed in a pipeline mixer at the front end of the on-site water diversion device; step 2, inputting the mixed liquid into an on-site water diversion device, wherein the on-site water diversion device carries out oil-water separation on the mixed liquid; and 3, the in-situ water diversion device inputs the separated gas phase and oil phase into a ground pipe network of an external conveying system, and inputs the separated water phase into an in-situ water injection buffer tank.
Description
Technical Field
The invention belongs to the technical field related to oilfield exploitation, and particularly relates to an in-situ water diversion treatment method applied to an oil extraction well of an oil and gas field.
Background
Along with the increasing of the water content in the produced liquid of the oil well, the production sewage output is increased, so that the output system is brought with larger pressure, the treatment cost of the production sewage is increased, and meanwhile, the operation of the combined station under a long-term heavy load brings great pressure to the operation and the safe production.
Disclosure of Invention
The invention aims to provide an on-site water diversion treatment method applied to oil recovery wells of oil and gas fields, so as to solve the problems in the background art, and the method can directly reinject the treated sewage after reaching standards, thereby reducing the treatment cost of the produced sewage and relieving the pressure of an external transmission system and a joint station.
In order to achieve the above purpose, the present invention provides the following technical solutions:
an in-situ water separation treatment method applied to oil recovery wells of oil and gas fields is characterized in that:
the method comprises the steps of 1, hoisting a dosing device, an on-site water diversion device, a dirty oil water buffer tank and an external transmission booster pump beside an oil well through a prying block respectively, adding a treatment agent through the dosing device, and then mixing the liquid produced by the oil well with the treatment agent in a pipeline mixer at the front end of the on-site water diversion device;
step 2, inputting the mixed liquid into an on-site water diversion device, wherein the on-site water diversion device carries out oil-water separation on the mixed liquid;
and 3, the in-situ water diversion device inputs the separated gas phase and oil phase into a ground pipe network of an external conveying system, and inputs the separated water phase into an in-situ water injection buffer tank.
It is further characterized by:
further, the step 2 specifically comprises the step 2.1. Inputting the mixed liquid into a first-stage separation tank of an in-situ water diversion device, and carrying out oil-water separation on the mixed liquid by the first-stage separation tank;
step 2.2, the water phase separated by the first-stage separating tank is input into a second-stage separating tank, and the water phase separated by the second-stage separating tank is subjected to oil-water separation;
and 2.3, the water phase separated by the secondary separation tank is input into a tertiary separation tank, and the water phase separated by the tertiary separation tank is subjected to oil-water separation.
Further, the step 3 specifically comprises a step 3.1. The first-stage separation tank of the in-situ water diversion device inputs the separated gas phase and oil phase into a ground pipe network of an output system;
step 3.2, the secondary separation tank and the tertiary separation tank of the on-site water diversion device respectively input the separated gas phase and oil phase into a ground pipe network of an external conveying system;
and 3.3, the three-stage separation tank of the in-situ water diversion device inputs the separated water phase into an in-situ water injection buffer tank.
Further, the step 3.2 specifically includes: step 3.2.1, respectively inputting the separated gas phase and oil phase into a dirty oil water buffer tank by a secondary separation tank and a tertiary separation tank of the in-situ water diversion device;
and 3.2.2, the dirty oil water buffer tank inputs the gas phase and the oil phase into a ground pipe network of an external conveying system under the action of an external conveying booster pump.
Further, the step 2.2 and the step 2.3 further comprise the step of supplementing air to the secondary separation tank and the tertiary separation tank by utilizing on-site oil gas.
Further, the step 2.1 further comprises setting the operation pressure of the primary separation tank to be 1.20-1.95 MPa which is the same as the ground pipe network of the external transmission system; the step 2.2 further comprises the step of setting the operation pressure of the secondary separation tank to be 0.25-0.35 MPa; the step 2.3 further comprises setting the operation pressure of the three-stage separation tank to be 0.025-0.035 MPa.
Further, the treatment agent is specifically KWP-330.
Compared with the prior art, the invention provides an in-situ water diversion treatment method applied to oil recovery wells of oil and gas fields, which has the following beneficial effects:
according to the invention, each device in the on-site water diversion treatment system is directly hung beside an oil well through the prying block, other on-site equipment is not required to be moved, then, after chemical adding mixing and three-stage separation treatment, a gas phase and an oil phase are input into a ground pipe network of an external conveying system, meanwhile, a water phase reaches a reinjection water index (the oil content is 0-50 ppm, the solid suspended matter content is 0-45 mg/L, and the median value of the particle diameter is less than or equal to 45 mu m), and the water phase is input into a water injection buffer tank on the site, so that a large amount of water phase is directly reinjected into the ground on the oil well site, the treatment cost of production sewage is reduced, and the pressure of the external conveying system and a joint station is reduced.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present invention;
FIG. 2 is a schematic diagram of the structure of the separator tank according to the present invention.
Detailed Description
Referring to fig. 1, the present invention provides a technical solution:
the utility model provides a be applied to on-the-spot water treatment facilities of oil gas field oil recovery oil well, its includes on-the-spot water knockout drum, the pipeline blender is installed to on-the-spot water knockout drum's input port, the input port of pipeline blender is connected with the liquid pipeline that comes, the charge mouth of pipeline blender is connected with the charge device, on-the-spot water knockout drum's gaseous phase and oil phase delivery outlet are connected with the ground pipe network of defeated system outward, on-the-spot water knockout drum's water phase delivery outlet is connected with the water injection buffer tank, the water injection buffer tank is directly reinjected into underground with water.
The on-site water diversion device further comprises a first-stage separation tank, a second-stage separation tank and a third-stage separation tank, wherein a pipeline mixer is arranged at an input port of the on-site water diversion device, the pipeline mixer is arranged at an input port of the first-stage separation tank, a gas phase and oil phase output port of the on-site water diversion device is connected with a ground pipeline network of an external transmission system, the gas phase and the oil phase output port of the first-stage separation tank are connected with the ground pipeline network of the external transmission system, a water phase output port of the first-stage separation tank is connected with an input port of the second-stage separation tank, a water phase output port of the second-stage separation tank is connected with an input port of the third-stage separation tank, a water phase output port of the on-site water diversion device is connected with a water injection buffer tank, and a gas phase and oil phase output port of the second-stage separation tank are connected with the ground pipeline network of the external transmission system.
The secondary separation tank and the tertiary separation tank also respectively comprise a gas supplementing port, so that the separation efficiency is improved.
The gas phase and oil phase output ports of the secondary separation tank and the tertiary separation tank are connected with a ground pipe network of an external transmission system, specifically, the gas phase and oil phase output ports of the secondary separation tank and the tertiary separation tank are connected with a dirty oil water buffer tank, and the output port of the dirty oil water buffer tank is connected with the ground pipe network of the external transmission system.
The dirty oil water buffer tank is also connected with an external transmission booster pump, and the gas phase and the oil phase are lifted into a ground pipe network by the external transmission booster pump.
The dosing device, the on-site water diversion device, the dirty oil water buffer tank and the external transmission booster pump are respectively installed by adopting a prying block, and the device equipment can be conveniently hoisted beside an oil well through the prying block without moving other on-site equipment.
The operating pressure of the primary separation tank is set to be 1.20-1.95 MPa which is the same as the ground pipe network of the external transmission system, so that the external transmission energy consumption is saved; the operating pressure of the secondary separation tank is set to be 0.25-0.35 MPa; the operating pressure of the three-stage separation tank is set to be 0.025-0.035 MPa.
An in-situ water separation treatment method applied to oil recovery wells of oil and gas fields by utilizing the treatment system comprises the following steps:
the method comprises the steps of 1, hoisting a dosing device, an on-site water diversion device, a dirty oil water buffer tank and an external transmission booster pump beside an oil well through a prying block respectively, adding a treatment agent through the dosing device, and then mixing the liquid produced by the oil well with the treatment agent in a pipeline mixer at the front end of the on-site water diversion device;
step 2, inputting the mixed liquid into an on-site water diversion device, wherein the on-site water diversion device carries out oil-water separation on the mixed liquid;
and 3, the in-situ water diversion device inputs the separated gas phase and oil phase into a ground pipe network of an external conveying system, and inputs the separated water phase into an in-situ water injection buffer tank.
Step 2 includes the concrete steps that step 2.1, the mixed liquid is input into a first-stage separation tank of an in-situ water diversion device, and the first-stage separation tank carries out oil-water separation on the mixed liquid;
step 2.2, the water phase separated by the first-stage separating tank is input into a second-stage separating tank, and the water phase separated by the second-stage separating tank is subjected to oil-water separation;
and 2.3, the water phase separated by the secondary separation tank is input into a tertiary separation tank, and the water phase separated by the tertiary separation tank is subjected to oil-water separation.
The step 3 specifically comprises the step 3.1. The first-stage separation tank of the in-situ water diversion device inputs the separated gas phase and oil phase into a ground pipe network of an external conveying system;
step 3.2, the secondary separation tank and the tertiary separation tank of the on-site water diversion device respectively input the separated gas phase and oil phase into a ground pipe network of an external conveying system;
and 3.3, the three-stage separation tank of the in-situ water diversion device inputs the separated water phase into an in-situ water injection buffer tank.
The step 3.2 specifically includes: step 3.2.1, respectively inputting the separated gas phase and oil phase into a dirty oil water buffer tank by a secondary separation tank and a tertiary separation tank of the in-situ water diversion device;
and 3.2.2, the dirty oil water buffer tank inputs the gas phase and the oil phase into a ground pipe network of an external conveying system under the action of an external conveying booster pump.
The step 2.2 and the step 2.3 also comprise the step of supplementing air to the secondary separation tank and the tertiary separation tank by utilizing on-site oil gas, so that the separation efficiency is improved.
The step 2.1 further comprises the step of setting the operation pressure of the primary separation tank to be 1.20-1.95 MPa which is the same as the ground pipe network of the external transmission system, so that the external transmission energy consumption is saved; the step 2.2 further comprises the step of setting the operation pressure of the secondary separation tank to be 0.25-0.35 MPa; the step 2.3 further comprises setting the operation pressure of the three-stage separation tank to be 0.025-0.035 MPa.
The treatment agent adopts a demulsifier, in particular to a comprehensive demulsifier KWP-330.
Referring to fig. 2, the structure and working principle of the first-stage separation tank, the second-stage separation tank and the third-stage separation tank mentioned in the scheme are as follows: the oily sewage enters the tank from the tangential inlet to form softer rotational flow movement, and the dissolved gas in the produced water is released in the form of bubbles due to the pressure reduction; the lighter components such as oil drops and bubbles are moved to the center of the tank body, adhesion occurs in the process, the oil drops with the density smaller than that of the oil drops are formed, the adhesion of the oil drops and the microbubbles rises in the center area, a continuous oil and bubble scum layer is formed on the water surface at the upper part in the tank, and the oil and bubble scum layer is continuously discharged out of the tank through a connecting pipe which is suspended in the tank at the top; the purified water is discharged from a water outlet after slowly flowing through a horizontal circular plate at the bottom of the tank, and mud sand and other heavier solid particles are discharged from an oil sludge outlet at regular intervals; when the amount of dissolved gas in the produced water is limited or even low, gas may be additionally injected near the inlet area outside the tank to enhance the oil-water separation effect.
Claims (1)
1. An in-situ water separation treatment method applied to oil recovery wells of oil and gas fields is characterized in that:
the method comprises the steps of 1, hoisting a dosing device, an on-site water diversion device, a dirty oil water buffer tank and an external transmission booster pump beside an oil well through a prying block respectively, adding a treatment agent through the dosing device, and then mixing the liquid produced by the oil well with the treatment agent in a pipeline mixer at the front end of the on-site water diversion device;
step 2, inputting the mixed liquid into an on-site water diversion device, wherein the on-site water diversion device carries out oil-water separation on the mixed liquid;
step 3, the in-situ water diversion device inputs the separated gas phase and oil phase into a ground pipe network of an external transmission system, and inputs the separated water phase into an in-situ water injection buffer tank;
step 2 includes the concrete steps that step 2.1, the mixed liquid is input into a first-stage separation tank of an in-situ water diversion device, and the first-stage separation tank carries out oil-water separation on the mixed liquid;
step 2.2, the water phase separated by the first-stage separating tank is input into a second-stage separating tank, and the water phase separated by the second-stage separating tank is subjected to oil-water separation;
step 2.3, the water phase separated by the secondary separation tank is input into a tertiary separation tank, and the water phase separated by the tertiary separation tank is subjected to oil-water separation;
the step 2.2 and the step 2.3 also comprise the step of supplementing air to the secondary separation tank and the tertiary separation tank by utilizing on-site oil gas;
the step 2.1 further comprises the step of setting the operation pressure of the primary separation tank to be 1.20-1.95 MPa which is the same as the ground pipe network of the external transmission system; the step 2.2 further comprises the step of setting the operation pressure of the secondary separation tank to be 0.25-0.35 MPa; the step 2.3 further comprises the step of setting the operation pressure of the three-stage separation tank to be 0.025-0.035 MPa;
the step 3 specifically comprises the step 3.1. The first-stage separation tank of the in-situ water diversion device inputs the separated gas phase and oil phase into a ground pipe network of an external conveying system;
step 3.2, the secondary separation tank and the tertiary separation tank of the on-site water diversion device respectively input the separated gas phase and oil phase into a ground pipe network of an external conveying system;
step 3.3, the three-stage separation tank of the in-situ water diversion device inputs the separated water phase into an in-situ water injection buffer tank;
the step 3.2 specifically includes: step 3.2.1, respectively inputting the separated gas phase and oil phase into a dirty oil water buffer tank by a secondary separation tank and a tertiary separation tank of the in-situ water diversion device;
step 3.2.2, the dirty oil water buffer tank inputs the gas phase and the oil phase into a ground pipe network of an external transmission system under the action of an external transmission booster pump;
when the amount of dissolved gas in the produced water is limited or even low, additional gas injection may be performed near the inlet area outside the separator tank.
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| CN202110550473.9A CN113440889B (en) | 2021-05-20 | 2021-05-20 | In-situ water diversion treatment method applied to oil field oil extraction well |
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| CN202110550473.9A CN113440889B (en) | 2021-05-20 | 2021-05-20 | In-situ water diversion treatment method applied to oil field oil extraction well |
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| CN113440889B true CN113440889B (en) | 2023-07-25 |
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| CN201157703Y (en) * | 2007-11-28 | 2008-12-03 | 北京石油化工学院 | Compact type rotary flow air float separating device for oily wastewater treatment |
| CN102807291B (en) * | 2011-06-02 | 2014-05-07 | 中国科学院生态环境研究中心 | Treatment method and equipment for oilfield produced water |
| CN105668827A (en) * | 2015-07-20 | 2016-06-15 | 中国海洋石油总公司 | Two-stage treatment method for offshore platform production wastewater |
| CN204918050U (en) * | 2015-07-20 | 2015-12-30 | 中国海洋石油总公司 | High -efficient whirl air supporting ware |
| CN112759140A (en) * | 2021-01-15 | 2021-05-07 | 武汉工程大学 | Vortex air floatation treatment system |
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