CN205532562U - Oilfield produced liquid divides and water treatment facilities on spot - Google Patents

Abstract

The utility model relates to an oilfield produced liquid divides and water treatment facilities on spot, which comprises a bracket, the jar body, hydraulic cyclone, ejector and sewage backwash pump, the jar body is located on the support, jar body upper portion is equipped with the mist extractor, hydraulic cyclone personally experiences sth. Part of the body from the jar, and the top is vertical inserts, be equipped with the import of extraction liquid on its top lateral wall, the top center is equipped with the overflow mouth, be equipped with the gas outlet on the jar body respectively, the overflow import, the water export, dissolve the gas -liquid import, export of lower moisture oil gas and sand discharge port, the import of sewage backwash pump links to each other with the water export through the pipeline, its export and gas outlet link to each other with the ejector import through the pipeline respectively, ejector export through the pipeline with dissolve the gas -liquid import and link to each other. The utility model discloses water is presorted to the collection and the sewage treatment function is as an organic whole, improves the treatment effeciency, reduces treatment cost.

Description

An in-situ water separation and water treatment device for oilfield production fluid

technical field

The utility model belongs to the technical field of oilfield production fluid treatment, in particular to an oilfield production fluid on-site water separation and water treatment device.

Background technique

At present, the oilfield production fluid gathering and transportation system mostly adopts two-level (single well, metering station, combined station) and third-level station layout (single well, metering station, transfer station, combined station). The produced fluid enters the combined station for oil-water separation, and the separated sewage is centrally treated at the sewage station and then returned to the water distribution room for pressurized reinjection. However, as the oil field enters a period of high water content, more and more sewage needs to be treated and reinjected, which increases the energy consumption of the sewage to and fro. In addition, a large amount of sewage also brings a series of problems to the existing ground gathering and treatment system: First, The original gathering and transportation pipeline network has limited transportation capacity, which may not be able to meet the transportation demand; second, the processing load of the combined station increases, and the processing effect becomes poor. To achieve the same processing index, it is necessary to increase equipment or increase the amount of dosing and the settlement temperature. lead to increased processing costs.

If in-situ water separation and reinjection can be carried out at the front end of the produced fluid gathering and transportation system, it will greatly reduce the energy consumption cost of the round-trip transportation of sewage, and at the same time effectively reduce the load on the gathering and transportation pipeline network and the combined station. The core of the system is a production fluid treatment device that can efficiently and quickly realize oil-water separation and sewage treatment up to standard. Accordingly, the present invention proposes an oil field production fluid in-situ water separation and water treatment integrated device, the sewage treated by the device can be directly pressurized and re-injected into the oil layer for water injection development again. In addition, for some remote areas, the device can be used to process the produced fluid on-site, reducing the investment in the gathering and transportation pipeline network and the energy consumption of trucks.

Contents of the invention

The purpose of this utility model is to provide an oilfield production fluid in-situ water separation and water treatment device for the above technical requirements, which can realize oilfield production fluid single well or metering station in-situ water separation and in-situ reinjection, effectively shortening the Production fluid treatment process.

In order to achieve the above object, the utility model adopts the following technical scheme: an oilfield production fluid in-situ water separation and water treatment device, which is characterized in that it includes a bracket, a tank, a hydrocyclone, an ejector and a sewage return pump , the tank body is arranged on the support, the upper part of the tank body is provided with a mist-catching net, the said mist-catching net and the top of the tank body form an air chamber, the middle and upper part of the tank body is a settling chamber, and the inner wall of the middle and lower part of the tank body is horizontally symmetrical An upper partition and a lower partition are provided, the inner side of the upper partition and the lower partition are connected with the outer wall of the annular coalescing cylinder to form a water chamber, and the coalescing cylinder is composed of an inner cylinder and an outer cylinder to form a ring Cylinder structure, the outer side of the inner cylinder forms an air flotation chamber, the bottom of the tank is a sand collection chamber, the hydrocyclone is inserted vertically from the top of the tank, and the tail end outlet of the hydrocyclone passes through the center of the mist trap Extending into the settling chamber, the top side wall of the hydrocyclone is provided with a production fluid inlet, the center of the top is provided with an overflow port, the gas chamber tank wall is provided with a gas outlet, and the settling chamber tank wall is provided with an overflow inlet and a lower water content oil and gas outlet, the water chamber tank wall is provided with a water outlet, the sand collection chamber tank wall is provided with a dissolved gas liquid inlet, and the center of the bottom is provided with a sand discharge port, and the inlet of the sewage return pump is connected to the water outlet through a pipeline , the outlet of the sewage return pump and the gas outlet are respectively connected to the inlet of the ejector through pipelines, and the outlet of the ejector is connected to the inlet of dissolved gas liquid through pipelines.

According to the above scheme, an overflow plate is provided at the corresponding position of the oil and gas outlet with lower water content. internal walls connected.

According to the above scheme, the inlet of the dissolved gas liquid is connected to the micro-bubble generating device through a pipeline, and the micro-bubble generating device is made of several air outlet pipes with uniformly spaced centers, and several releasers are evenly spaced on the air outlet pipes.

According to the above scheme, a baffle is provided below the outlet at the tail end of the hydrocyclone, and the baffle is connected to the hydrocyclone through a connecting rod.

According to the above scheme, the top of the inner cylinder of the coalescing cylinder is higher than the top of the outer cylinder, and several small holes are evenly spaced on the inner cylinder and the outer cylinder.

According to the above scheme, the apertures of the small holes decrease sequentially from top to bottom.

According to the above scheme, several through holes are evenly spaced on the top plate and the bottom plate of the coalescing cylinder.

According to the above solution, an annular water collecting pipe is arranged inside the water chamber, and the water collecting pipe communicates with the water outlet through a pipe.

The beneficial effects of the utility model are: to provide an oilfield production fluid on-site water separation and water treatment device, which integrates the functions of pre-water separation and sewage treatment, and the interior of the device is highly integrated with swirl, air flotation, coalescence and pressure Four separation technologies such as sedimentation have effectively improved the treatment efficiency, and the outlet sewage can be directly re-injected into the formation, which has the advantages of compact structure, small footprint and high treatment efficiency.

Description of drawings

Fig. 1 is a structural schematic diagram of an embodiment of the utility model.

Fig. 2 is a view along the line A-A of Fig. 1 .

Among them: 1-support, 2-tank, 3-hydrocyclone, 4-sewage return pump, 5-mist trap, 6-ejector, 7-microbubble generating device, 8-baffle, 9- Air chamber, 10-sedimentation chamber, 11-water chamber, 12-air flotation chamber, 13-sand collection chamber, 14-coalescing cylinder, 15-inner cylinder, 16-outer cylinder, 17-upper partition, 18-bottom Separator, 19-produced liquid inlet, 20-overflow port, 21-gas outlet, 22-overflow inlet, 23-water outlet, 24-dissolved gas liquid inlet, 25-sand outlet, 26-lower water content Oil and gas outlet, 27-overflow plate, 28-water collecting pipe.

detailed description

The implementation of the utility model is now described in conjunction with the accompanying drawings, and the utility model is not limited to the following examples.

As shown in Figure 1-2, an oilfield produced fluid in-situ water separation and water treatment device includes a bracket 1, a tank body 2, a hydrocyclone 3, an ejector 6 and a sewage return pump 4, and the tank body is designed On the bracket, the upper part of the tank body is provided with a mist-catching net 5, which forms an air chamber 9 with the top of the tank body, and the middle and upper part of the tank body is a settling chamber 10. The hydrocyclone is inserted vertically from the top of the tank body, and the outlet at the end of the period passes Extending through the center of the mist-catching net into the settling chamber, an upper partition 17 and a lower partition 18 are horizontally and symmetrically arranged on the inner wall of the middle and lower part of the tank body, and the inner sides of the upper and lower partitions are connected with the outer wall of the ring-shaped coalescing cylinder 14 to form The water chamber 11 and the coalescing cylinder are composed of an inner cylinder 15 and an outer cylinder 16 to form an annular cylinder structure. The outer side of the inner cylinder forms an air flotation chamber 12, and the bottom of the tank is a sand collection chamber 13. The top of the inner cylinder is higher than the top of the outer cylinder, and the height is The outlet part can prevent the tail end of the hydrocyclone from entering from the top of the coalescing cylinder. There are several small holes evenly spaced on the inner cylinder and the outer cylinder, and the aperture of the small holes decreases from top to bottom to make the air float The indoor fluid can enter the coalescing cylinder more evenly in the axial direction, reducing the phenomenon of bias flow. The production fluid inlet 19 is provided on the top side wall of the hydrocyclone, the overflow port 20 is provided at the center of the top, and the tank wall of the gas chamber is provided. There is a gas outlet 21, an overflow inlet 22 is provided on the tank wall of the settling chamber, a water outlet 23 is provided on the tank wall of the water chamber, a dissolved gas liquid inlet 24 is provided on the tank wall of the sand collection chamber, and a sand discharge port 25 is provided at the bottom center , the inlet of the sewage return pump is connected to the water outlet through a pipe, the outlet of the sewage return pump and the gas outlet are respectively connected to the inlet of the ejector through a pipe, and the outlet of the ejector is connected to the inlet of the dissolved gas liquid through a pipe, and the ejector replaces the conventional air flotation process The dissolved air tank adopts high-pressure sewage injection to bring in lower-pressure gas, so as to realize dissolved air and effectively reduce the equipment footprint. Several through holes are evenly spaced on the top and bottom plates of the coalescing cylinder to make the coalescing The oil droplets separated by the cylinder can move upward to the upper part of the tank body, and the sand particles and other heavy impurities can move down to the sand collection chamber at the bottom of the tank body and be discharged through the sand discharge port.

The tank wall of the settling chamber is provided with a lower water-containing oil and gas outlet 26, and the corresponding position of the lower water-containing oil and gas outlet inside the tank body is provided with an overflow plate 27. The overflow plate includes a flat plate, a vertical plate and two side plates, and the flat plate and The inner sides of the plates are respectively connected with the inner wall of the tank.

The gas-dissolved liquid inlet passes through the pipeline and the micro-bubble generating device 7. The micro-bubble generating device is made of several air outlet pipes that are evenly spaced across the center, and several releasers are evenly spaced on the air outlet pipes, so that the pressure dissolved gas incorporated into the gas ejector The water releases a large number of fine air bubbles, thereby improving the air flotation effect, and at the same time, it is beneficial to blow off the oil droplets attached to the surface of the coalescing cylinder, realize the separation of oil and water, and relieve the blockage of the aggregated packing.

A baffle 8 is provided below the tail outlet of the hydrocyclone, and the baffle is connected to the hydrocyclone through a connecting rod to reduce the impact of the fluid at the tail outlet of the hydrocyclone on the lower area of the tank and stabilize the flow field.

An annular water collecting pipe 28 is arranged inside the water chamber, and the water collecting pipe is connected with the water outlet through the pipe, so that the circumferential water flow can evenly flow into the water collecting pipe, avoiding the bias flow problem caused by the direct opening of the tank wall for liquid discharge.

The utility model workflow is as follows:

The oilfield production fluid first enters the hydrocyclone for preliminary separation through the difference in centrifugal force, and the separated oil with low water content and associated gas flow out through the overflow port of the top plate of the hydrocyclone, and then return to the settlement of the tank through the overflow inlet The oil, gas and water are separated again; the oily sewage flowing out of the outlet of the tail end of the hydrocyclone enters the tank settling chamber, and the oily sewage separated by sedimentation first enters the air flotation chamber, and the sewage is degreased and degreased by air flotation. Suspended solids are treated, and then enter the coalescing cylinder horizontally through the small holes in the wall of the coalescing cylinder. After further degreasing treatment, the sewage enters the water chamber, collects it through the ring-shaped water collection pipe set at the bottom of the water chamber, and discharges it through the water outlet. After the water injection pump is pressurized, it can be reinjected into the oil layer; after the treatment, the sewage part is refluxed, pressurized by the sewage return pump, and part of the associated gas separated in the settlement is dissolved into this part of the sewage through the ejector, and then the dissolved gas liquid passes through the micro The bubble generating device generates micro-bubbles to achieve the effect of air flotation sewage treatment; the water-containing oil separated by sedimentation is collected by the overflow plate, and the rest of the associated gas flows out through the oil and gas outlet with lower water content and enters the original gathering and transportation system; the tank settles The sand and other heavy impurities separated from the chamber, air flotation chamber and coalescing cylinder are gathered in the sand collection chamber and discharged from the sand discharge port regularly.

Claims (8)

1. an oil field mining liquid divides water and water treatment facilities on the spot, it is characterised in that include support, tank body, hydrocyclone, Injector and sewage backflow pump, described tank body is located on described support, and tank body top is provided with mist extractor, described mist extractor and tank body Air chamber is formed on top, and tank body middle and upper part is expansion chamber, and on the inwall of tank body middle and lower part, horizontal symmetry is provided with upper spacer and lower clapboard, institute The outer wall coalescing cylinder of the inner side edge and annular of stating upper spacer and lower clapboard is connected to form hydroecium, and described coalescence cylinder is by inner core and urceolus Constituting annular barrel structure, form gas-floating chamber outside described inner core, tank base is sand collecting chamber, and described hydrocyclone is from tank body Top vertical inserts, and the caudal end egress of hydrocyclone stretches into described expansion chamber, hydrocyclone top side through mist extractor center Wall is provided with Produced Liquid import, and top center is provided with overfall, and air chamber tank skin is provided with gas outlet, and expansion chamber tank skin is provided with Overflow inlet and relatively low aqueous oil gas vent, hydroecium tank skin is provided with water out, and sand collecting chamber's tank skin is provided with molten gas-liquid import, the end Center, portion is provided with sand removing hole, and described sewage backflow pump inlet is connected with water out by pipeline, and sewage backflow pump discharge and gas go out Mouth is connected with described injector import by pipeline respectively, and injector outlet is connected with molten gas-liquid import by pipeline.

A kind of oil field mining liquid the most according to claim 1 divides water and water treatment facilities on the spot, it is characterised in that described relatively low The opposite position of aqueous oil gas vent is provided with overflow plate, and described overflow plate includes flat board, riser and biside plate, described flat board and The inner side edge of biside plate is connected with inner tank wall respectively.

A kind of oil field mining liquid the most according to claim 2 divides water and water treatment facilities on the spot, it is characterised in that described molten gas Liquid import is connected with micro bubble generation device by pipeline, described micro bubble generation device by several escape pipe central crossbar uniform between Every making, on described escape pipe, uniform intervals is provided with several release.

A kind of oil field mining liquid the most according to claim 1 divides water and water treatment facilities on the spot, it is characterised in that described waterpower The lower section of the caudal end egress of cyclone is provided with baffle plate, and described baffle plate is connected with hydrocyclone by connecting rod.

A kind of oil field mining liquid the most according to claim 2 divides water and water treatment facilities on the spot, it is characterised in that described coalescence The inner core top of cylinder is higher than urceolus top, and on inner core and urceolus, uniform intervals is provided with several aperture.

A kind of oil field mining liquid the most according to claim 5 divides water and water treatment facilities on the spot, it is characterised in that described aperture Aperture be sequentially reduced from top to bottom.

7. divide water and water treatment facilities on the spot according to a kind of oil field mining liquid described in claim 5 or 6, it is characterised in that described On the top board of coalescence cylinder and base plate, uniform intervals is provided with several through hole.

A kind of oil field mining liquid the most according to claim 1 divides water and water treatment facilities on the spot, it is characterised in that described hydroecium Inside is provided with the collector pipe of annular, and described collector pipe is connected with described water out by pipeline.