阅读说明：本技术 一种应用于油气田采油油井的就地分水处理方法 (On-site water distribution treatment method applied to oil production well of oil and gas field ) 是由 徐晓冬 聂华 李兵 郭新华 殷波 于 2021-05-20 设计创作，主要内容包括：本发明的目的在于提供一种应用于油气田采油油井的就地分水处理方法,其能够快速、高效就地将采出油水混合物分离,污水处理达标后直接回注,降低了生产污水的处理成本,减轻了外输系统和联合站的压力,包括步骤1.将加药装置、就地分水装置、污油水缓冲罐和外输增压泵分别通过撬块吊装在油井旁边,通过加药装置加入专用处理药剂,然后将油井产出的物液与专用处理药剂在就地分水装置前端的管道混合器中混合；步骤2.将混合后的物液输入就地分水装置,所述就地分水装置将上述混合后的物液进行油水分离；步骤3.所述就地分水装置将分离出来的气相和油相输入外输系统的地面管网,将分离出来的水相输入现场注水缓冲罐。(The invention aims to provide an in-situ water diversion treatment method applied to an oil extraction well of an oil and gas field, which can quickly and efficiently separate an extracted oil-water mixture in situ, directly reinject sewage after reaching the standard, reduce the treatment cost of production sewage and reduce the pressure of an external transportation system and a combined station, and comprises the following steps of 1, respectively hoisting a dosing device, an in-situ water diversion device, a dirty oil-water buffer tank and an external transportation booster pump beside the oil well through a prying block, adding a special treatment agent through the dosing device, and then mixing a liquid produced by the oil well and the special treatment agent in a pipeline mixer at the front end of the in-situ water diversion device; step 2, inputting the mixed liquid into an on-site water distribution device, and carrying out oil-water separation on the mixed liquid by the on-site water distribution device; and 3, inputting the separated gas phase and oil phase into a ground pipe network of an output system by the local water distribution device, and inputting the separated water phase into a field water injection buffer tank.)

1. An in-situ water diversion treatment method applied to oil extraction wells of oil and gas fields is characterized in that:

the method comprises the following steps of 1, respectively hoisting a dosing device, an in-situ water diversion device, a waste oil water buffer tank and an outward-conveying booster pump beside an oil well through a prying block, adding a special treatment agent through the dosing device, and then mixing a liquid produced by the oil well and the special treatment agent in a pipeline mixer at the front end of the in-situ water diversion device;

step 2, inputting the mixed liquid into an on-site water distribution device, and carrying out oil-water separation on the mixed liquid by the on-site water distribution device;

and 3, inputting the separated gas phase and oil phase into a ground pipe network of an output system by the local water distribution device, and inputting the separated water phase into a field water injection buffer tank.

2. The in-situ water diversion treatment method applied to oil and gas field production wells according to claim 1, characterized in that: the step 2 specifically comprises the step 2.1 of inputting the mixed liquid into a primary separating tank of the on-site water distribution device, and carrying out oil-water separation on the mixed liquid by the primary separating tank;

2.2, inputting the separated water phase into a secondary separation tank by the primary separation tank, and carrying out oil-water separation on the separated water phase by the secondary separation tank;

and 2.3, inputting the separated water phase into a third-stage separation tank by the second-stage separation tank, and carrying out oil-water separation on the separated water phase by the third-stage separation tank.

3. The in-situ water diversion treatment method applied to oil and gas field production wells according to claim 2, characterized in that: the step 3 specifically comprises a step 3.1, the separated gas phase and oil phase are input into a ground pipe network of an output system by a primary separation tank of the on-site water distribution device;

3.2, respectively inputting the separated gas phase and oil phase into a ground pipe network of an external transmission system by a secondary separation tank and a tertiary separation tank of the on-site water distribution device;

and 3.3, inputting the separated water phase into a field water injection buffer tank by using a three-stage separation tank of the on-site water distribution device.

4. The in-situ water diversion treatment method applied to oil and gas field production wells according to claim 3, characterized in that: the step 3.2 specifically comprises: step 3.2.1, respectively inputting the separated gas phase and oil phase into a sump oil water buffer tank by a secondary separation tank and a tertiary separation tank of the on-site water distribution device;

and 3.2.2, inputting the gas phase and the oil phase into a ground pipe network of the outward transportation system by the dirty oil water buffer tank under the action of an outward transportation booster pump.

5. The in-situ water diversion treatment method applied to oil and gas field production wells according to claim 2, characterized in that: and the step 2.2 and the step 2.3 also comprise the step of utilizing oil gas on site to supplement air for the secondary separation tank and the tertiary separation tank.

6. The in-situ water diversion treatment method applied to oil and gas field production wells according to claim 2, characterized in that: the step 2.1 also comprises setting the operating pressure of the primary separating tank to be 1.20-1.95 MPa which is the same as the ground pipe network of the output system; the step 2.2 also comprises setting the operating pressure of the secondary separating tank to be 0.25-0.35 MPa; and the step 2.3 also comprises setting the operation pressure of the three-stage separation tank to be 0.025-0.035 MPa.

7. The in-situ water diversion treatment method applied to oil and gas field production wells according to claim 1, characterized in that: the special treatment agent is KWP-330.

Technical Field

The invention belongs to the technical field related to oil field exploitation, and particularly relates to an in-situ water distribution treatment method applied to an oil extraction well of an oil and gas field.

Background

With the increasing water content of the produced liquid of the oil well, the production sewage yield is increased, so that a larger pressure is brought to an output system, the treatment cost of the production sewage is increased, and meanwhile, the long-term large-load operation of the combined station also brings a large pressure to operation and safe production.

Disclosure of Invention

The invention aims to provide an in-situ water diversion treatment method applied to an oil extraction well of an oil and gas field, which aims to solve the problems in the background art, can treat sewage on site and then directly reinject the sewage after reaching the standard, reduces the treatment cost of the production sewage, and lightens the pressure of an external transportation system and a united station.

In order to achieve the purpose, the invention provides the following technical scheme:

an in-situ water diversion treatment method applied to oil extraction wells of oil and gas fields is characterized in that:

the method comprises the following steps of 1, respectively hoisting a dosing device, an in-situ water diversion device, a waste oil water buffer tank and an outward-conveying booster pump beside an oil well through a prying block, adding a special treatment agent through the dosing device, and then mixing a liquid produced by the oil well and the special treatment agent in a pipeline mixer at the front end of the in-situ water diversion device;

step 2, inputting the mixed liquid into an on-site water distribution device, and carrying out oil-water separation on the mixed liquid by the on-site water distribution device;

and 3, inputting the separated gas phase and oil phase into a ground pipe network of an output system by the local water distribution device, and inputting the separated water phase into a field water injection buffer tank.

It is further characterized in that:

further, the step 2 specifically comprises a step 2.1 of inputting the mixed material liquid into a primary separation tank of the on-site water distribution device, wherein the primary separation tank carries out oil-water separation on the mixed material liquid;

2.2, inputting the separated water phase into a secondary separation tank by the primary separation tank, and carrying out oil-water separation on the separated water phase by the secondary separation tank;

and 2.3, inputting the separated water phase into a third-stage separation tank by the second-stage separation tank, and carrying out oil-water separation on the separated water phase by the third-stage separation tank.

Further, the step 3 specifically comprises a step 3.1, the separated gas phase and oil phase are input into a ground pipe network of an external transportation system by a primary separation tank of the on-site water diversion device;

3.2, respectively inputting the separated gas phase and oil phase into a ground pipe network of an external transmission system by a secondary separation tank and a tertiary separation tank of the on-site water distribution device;

and 3.3, inputting the separated water phase into a field water injection buffer tank by using a three-stage separation tank of the on-site water distribution device.

Further, the step 3.2 specifically includes: step 3.2.1, respectively inputting the separated gas phase and oil phase into a sump oil water buffer tank by a secondary separation tank and a tertiary separation tank of the on-site water distribution device;

and 3.2.2, inputting the gas phase and the oil phase into a ground pipe network of the outward transportation system by the dirty oil water buffer tank under the action of an outward transportation booster pump.

Further, the step 2.2 and the step 2.3 further comprise the step of utilizing oil gas on site to supplement air for the second-stage separation tank and the third-stage separation tank.

Further, the step 2.1 also comprises setting the operating pressure of the primary separating tank to be 1.20-1.95 MPa which is the same as the ground pipe network of the output system; the step 2.2 also comprises setting the operating pressure of the secondary separating tank to be 0.25-0.35 MPa; and the step 2.3 also comprises setting the operation pressure of the three-stage separation tank to be 0.025-0.035 MPa.

Further, the special treatment agent is KWP-330.

Compared with the prior art, the invention provides an in-situ water diversion treatment method applied to an oil extraction well of an oil and gas field, which has the following beneficial effects:

according to the invention, each device in the in-situ water diversion treatment system is directly hoisted beside an oil well by a prying block without moving other field devices, then after medicine adding mixing and three-stage separation treatment, gas phase and oil phase are input into a ground pipe network of an external transportation system, meanwhile, water phase reaches the reinjection water index (oil content is 0-50 ppm, solid suspended matter content is 0-45 mg/L, median particle diameter is less than or equal to 45 mu m), and water phase is input into a field water injection buffer tank, so that a large amount of water phase is directly reinjected to the underground on the oil well field, the treatment cost of production sewage is reduced, and the pressure of the external transportation system and a combination station is reduced.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the structure of the separation tank of the present invention.

Detailed Description

Referring to fig. 1, the present invention provides a technical solution:

the utility model provides a be applied to oil field oil recovery oil well's water treatment system on spot, it includes the water diversion device on spot, the pipe mixer is installed to the input port of water diversion device on spot, the input port of pipe mixer is connected with the liquid pipeline that comes, the medicine mouth that adds of pipe mixer is connected with charge device, the gaseous phase and the oil phase delivery outlet of water diversion device on spot are connected with the ground pipe network of outer conveying system, the water phase delivery outlet of water diversion device on spot is connected with the water injection buffer tank, the water injection buffer tank is with the direct reinjection of water underground.

The on-site water diversion device also comprises a primary separating tank, a secondary separating tank and a tertiary separating tank, wherein a pipeline mixer is arranged at the input port of the on-site water diversion device, in particular a pipeline mixer is arranged at the input port of the primary separating tank, the gas phase and oil phase output port of the on-site water diversion device is connected with the ground pipe network of the external transportation system, in particular the gas phase and oil phase output port of the primary separation tank is connected with the ground pipe network of the external transportation system, the water phase output port of the first-stage separation tank is connected with the input port of the second-stage separation tank, the water phase output port of the second-stage separation tank is connected with the input port of the third-stage separation tank, the water phase output port of the on-site water diversion device is connected with the water injection buffer tank, in particular the water phase output port of the three-stage separation tank is connected with the water injection buffer tank, and the gas phase and oil phase output ports of the second-stage separation tank and the third-stage separation tank are connected with a ground pipe network of the output system.

The second-stage separation tank and the third-stage separation tank respectively comprise an air supplementing port, so that the separation efficiency is improved.

The gas phase and oil phase output ports of the second-stage separation tank and the third-stage separation tank are connected with a ground pipe network of an external conveying system, specifically, the gas phase and oil phase output ports of the second-stage separation tank and the third-stage separation tank are connected with a waste oil water buffer tank, and the output port of the waste oil water buffer tank is connected with the ground pipe network of the external conveying system.

The dirty oil water buffer tank is also connected with an outward-conveying booster pump, and the gas phase and the oil phase are lifted by the outward-conveying booster pump to enter a ground pipe network.

The chemical feeding device, the on-site water distribution device, the dirty oil water buffer tank and the external booster pump are respectively installed by adopting a prying block, the device equipment can be conveniently hoisted beside an oil well through the prying block, and other equipment on the site does not need to be moved.

The operating pressure of the primary separating tank is set to be 1.20-1.95 MPa which is the same as that of a ground pipe network of the external transportation system, so that the external transportation energy consumption is saved; the operating pressure of the secondary separating 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.

The in-situ water distribution treatment method applied to the oil extraction well of the oil and gas field by utilizing the treatment system comprises the following steps:

the method comprises the following steps of 1, respectively hoisting a dosing device, an in-situ water diversion device, a waste oil water buffer tank and an outward-conveying booster pump beside an oil well through a prying block, adding a special treatment agent through the dosing device, and then mixing a liquid produced by the oil well and the special treatment agent in a pipeline mixer at the front end of the in-situ water diversion device;

step 2, inputting the mixed liquid into an on-site water distribution device, and carrying out oil-water separation on the mixed liquid by the on-site water distribution device;

and 3, inputting the separated gas phase and oil phase into a ground pipe network of an output system by the local water distribution device, and inputting the separated water phase into a field water injection buffer tank.

The step 2 specifically comprises the step 2.1 of inputting the mixed liquid into a primary separating tank of the on-site water distribution device, and carrying out oil-water separation on the mixed liquid by the primary separating tank;

2.2, inputting the separated water phase into a secondary separation tank by the primary separation tank, and carrying out oil-water separation on the separated water phase by the secondary separation tank;

and 2.3, inputting the separated water phase into a third-stage separation tank by the second-stage separation tank, and carrying out oil-water separation on the separated water phase by the third-stage separation tank.

The step 3 specifically comprises a step 3.1, the separated gas phase and oil phase are input into a ground pipe network of an output system by a primary separation tank of the on-site water distribution device;

3.2, respectively inputting the separated gas phase and oil phase into a ground pipe network of an external transmission system by a secondary separation tank and a tertiary separation tank of the on-site water distribution device;

and 3.3, inputting the separated water phase into a field water injection buffer tank by using a three-stage separation tank of the on-site water distribution device.

The step 3.2 specifically comprises: step 3.2.1, respectively inputting the separated gas phase and oil phase into a sump oil water buffer tank by a secondary separation tank and a tertiary separation tank of the on-site water distribution device;

and 3.2.2, inputting the gas phase and the oil phase into a ground pipe network of the outward transportation system by the dirty oil water buffer tank under the action of an outward transportation booster pump.

And 2.2 and 2.3, the air is supplied to the second-stage separation tank and the third-stage separation tank by using oil gas on site, so that the separation efficiency is improved.

The step 2.1 also comprises the step of setting the operating pressure of the primary separating tank to be 1.20-1.95 MPa which is the same as the ground pipe network of the external transportation system, so that the external transportation energy consumption is saved; the step 2.2 also comprises setting the operating pressure of the secondary separating tank to be 0.25-0.35 MPa; and the step 2.3 also comprises setting the operation pressure of the three-stage separation tank to be 0.025-0.035 MPa.

The special treatment agent adopts a demulsifier, in particular to a comprehensive demulsifier KWP-330.

Referring to fig. 2, the structure and the 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 dissolved gas in the produced water is released in the form of bubbles due to the reduction of pressure; lighter components such as oil drops and air bubbles are transported to the center of the tank body, and are adhered in the process to form oil drops with density smaller than that of the oil drops, namely micro-bubble adhered bodies, which rise in the central area, and finally a continuous oil and air bubble scum layer is formed on the water surface at the upper part in the tank, and the oil and air bubbles are continuously discharged out of the tank through a connecting pipe with the top suspended in the tank; the purified water slowly flows through a horizontal circular plate at the bottom of the tank and is discharged from a water outlet, and the silt and other heavy solid particles are periodically discharged from an oil sludge outlet; when the amount of gas dissolved in the produced water is limited or even low, additional gas may be injected near the inlet region outside the tank to enhance the oil-water separation effect.