CN214415676U

CN214415676U - Inclined plate settling tank for oilfield reinjection water

Info

Publication number: CN214415676U
Application number: CN202022584096.4U
Authority: CN
Inventors: 艾小凡; 陈静; 李�浩
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-11-10
Filing date: 2020-11-10
Publication date: 2021-10-19
Anticipated expiration: 2030-11-10

Abstract

The application provides an inclined plate settling tank for oil field reinjection water, include: a box body; a water inlet; a flow stabilizer; a ramp region; a sludge hopper; a water collection tank; an oil remover; the water inlet and the water outlet are respectively arranged on the opposite sides of the box body; the flow stabilizing plate is fixed on the box body, and the lower part of the flow stabilizing plate is provided with a space allowing inflow water to pass; the inclined plate area is fixed between the flow stabilizing plate and the box body and comprises a first inclined plate area and a second inclined plate area, wherein inclined directions of inclined plates of the first inclined plate area and the second inclined plate area are opposite, inclined angles (in acute angles) are respectively 30-70 degrees, and the inclined angle of the inclined plate of the first inclined plate area is larger than that of the inclined plate of the second inclined plate area; the sludge hopper is arranged below the box body; the water collecting grooves are fixed on two sides of the box body and connected with the water outlet; the oil remover is connected with the upper side of the box body.

Description

Inclined plate settling tank for oilfield reinjection water

Technical Field

The utility model relates to a water treatment facilities field especially relates to a settlement equipment for oil field reinjection water.

Background

The main mode of the low permeability reservoir development technology is water injection, and the principle of the technology is that crude oil is produced to cause underground depletion, and water injection is needed to maintain or improve the reservoir pressure, so that higher recovery efficiency is obtained. In recent years, oilfield flooding has become more and more widely used in oilfield development. Because of shortage of water resources in northern Shaanxi, the water source of the injected water in the oil field is mainly produced water in the oil field and is supplemented by clear water. In the process of water injection exploitation, the quality of reinjection water is the most fundamental factor influencing the water injection exploitation effect of the whole oil field, and the operation and the service life of the whole water injection treatment system are also influenced.

Currently, low permeability oilfield reinjection water treatment processes typically add a fine filtration process after conventional secondary or tertiary treatment. Mainly comprises the following steps: oil extraction wastewater → sedimentation oil removal tank → air flotation machine/pool → conventional filter → fine filter → water injection station; oil recovery wastewater → settling oil removal tank → conventional filter → fine filter → water injection station, etc. The fine filtration is a key link for determining the quality of the reinjection water, and if the flocculation sedimentation (hereinafter, referred to as pretreatment) treatment cannot meet the requirement, the fine filtration is difficult to play a role, and even the fine filtration is possibly paralyzed due to poor pretreatment effect.

At present, the water treatment effects of oil fields in China are different, the standard reaching rate of the quality of the reinjection water is lower on the whole, and indexes such as oil, suspended matters, bacteria and the like in the treated water are generally higher. As mentioned above, this is because fine filtering does not work adequately. Further, the reason for the failure of the fine filtration is mainly that the previous pretreatment process is not fully functional.

Therefore, there is a need to improve the treatment efficiency of the pretreatment process to ultimately improve the quality of the oilfield reinjection water.

SUMMERY OF THE UTILITY MODEL

[ problem ] to

In order to overcome the problem, the utility model provides an inclined plate settling tank, its treatment effeciency that aims at improving the pretreatment processes improves the quality of water that intakes of meticulous filter, and then improves oil field reinjection water quality of water.

[ solution ]

. The utility model provides an inclined plate settling tank for oil field reinjection water, it includes: a box body; a water inlet; a flow stabilizer; a ramp region; a sludge hopper; a water collection tank; an oil remover; the water inlet and the water outlet are respectively arranged on the opposite sides of the box body; the flow stabilizing plate is fixed on the box body, and the lower part of the flow stabilizing plate is provided with a space allowing inflow water to pass; the inclined plate area is fixed between the flow stabilizing plate and the box body and comprises a first inclined plate area and a second inclined plate area, wherein inclined directions of inclined plates of the first inclined plate area and the second inclined plate area are opposite, inclined angles (in acute angles) are respectively 30-70 degrees, and the inclined angle of the inclined plate of the first inclined plate area is larger than that of the inclined plate of the second inclined plate area; the sludge hopper is arranged below the box body; the water collecting grooves are fixed on two sides of the box body and connected with the water outlet; and the oil remover is connected with the upper side of the box body.

In the present invention, the material and thickness of the case are not particularly limited, and those known in the art may be applied. Preferably, the case may be made of, for example, stainless steel, glass fiber reinforced plastic, cast iron, or the like.

The utility model discloses in, the mode of intaking is not restricted especially, can be for example inlet tube, intake chamber etc.. Preferably, the water is fed by a water inlet pipe.

The utility model discloses in, set up the efflux and the turbulent flow of stabilizer in order to eliminate the influent water, make the influent water flow state remain stable, be favorable to keeping flocculation effect and follow-up settlement effect like this. The flow stabilizing plate is fixed on the upper part of the box body, and a space allowing inflow water to pass through is reserved between the lower part of the flow stabilizing plate and the box body. The size and shape of the space are not particularly limited, and preferably, the cross-section of the space may be rectangular. The material and thickness of the stabilizer plate are also not particularly limited, for example, the stabilizer plate may be made of plastic, metal, ceramic, or other materials.

In the present invention, the swash plate region comprises a first swash plate region and a second swash plate region, wherein the height ratio of the first swash plate region to the second swash plate region may be 1:3 to 3:1, such as 1:3, 1:2.5, 1:2, 1:1.5, 1:1, 1.5:1, 2:1, 2.5:1 or 3:1, preferably the height ratio may be 1:1. Through setting up two independent swash plate district, can further increase into the hydraulic power dwell time of water to improve and subside the effect.

In the utility model, the inclined plates of the inclined plate area are arranged obliquely and have opposite inclination directions, namely, if the inclined plate of the first inclined plate area is inclined to the left, the inclined plate of the second inclined plate area is inclined to the right; on the contrary, if the swash plate of the first swash plate region is inclined to the right, the swash plate of the second swash plate region is inclined to the left. The purpose of this staggered arrangement is to further enhance the settling effect. In this context, "leftward" or "rightward" inclination refers to the inclination direction of the swash plate as viewed by an observer on a cross section of the swash plate (e.g., on the cross section of fig. 2).

In the present invention, the swash plate in the swash plate region is inclined and the inclination angle (in an acute angle) is 30 degrees to 70 degrees. Too large or too small an angle of inclination will lead to the problem of sludge accumulation too fast to be discharged in time, or to the problem of insufficient hydraulic retention time and thus poor settling effect. For example, the angle of inclination may be 30 degrees, 35 degrees, 40 degrees, 45 degrees, 50 degrees, 55 degrees, 60 degrees, 65 degrees or 70 degrees, preferably 50 degrees to 65 degrees, such as 50 degrees, 55 degrees, 60 degrees or 65 degrees, most preferably 60 degrees. Herein, unless otherwise specified, the inclination angles are all in acute angles measured with respect to the horizontal direction.

The utility model discloses in, the swash plate inclination in first swash plate district is greater than the swash plate inclination in second swash plate district. The arrangement mode is beneficial to smooth sedimentation of the sludge, otherwise, the sludge settled in the second inclined plate area can be accumulated on the inclined plates of the first inclined plate area, and thus, the sedimentation effect is deteriorated. For example, the swash plate inclination angle of the first swash plate region may be 5 degrees, 10 degrees, 15 degrees, 20 degrees, 25 degrees, 30 degrees, 35 degrees, or 40 degrees, preferably 15 degrees, greater than the swash plate inclination angle of the second swash plate region.

In the present invention, the material, thickness, distance, and the like of the swash plate in the swash plate region are not particularly limited. For example, the swash plate may be commonly used polypropylene, polyvinyl chloride, ethylene-propylene copolymer, glass fiber reinforced plastic, and the like. The thickness of the ramp may be, for example, from 1 mm to 10 mm, preferably from 1 mm to 3 mm. The pitch of the inclined plates may be, for example, 50 mm to 150 mm, preferably 80 mm to 120 mm, more preferably 90 mm to 100 mm. Preferably, the pitch of the swash plates of the first swash plate region is not smaller than the pitch of the swash plates of the second swash plate region.

The utility model discloses in, the below of box is provided with the sludge bucket. The sludge hopper can be integrally formed with the box body and can also be independently arranged. The sludge in the sludge hopper can be discharged by a power device such as a sludge pump and/or returned to the water outlet. In the case of sludge recirculation, the recirculation ratio is not particularly limited and may be adjusted as known to those skilled in the art.

The utility model discloses in, the water catch bowl is fixed to the both sides of box. The water collection tank can be arranged along the direction from water inlet to water outlet and can also be arranged along the direction vertical to the direction. The number of the water collecting grooves is not particularly limited, and may be, for example, one or more, and the specific number thereof may be determined according to the size and configuration of the water collecting grooves, the size of the tank, the hydraulic retention time, and the like. Typically, a plurality of water collection troughs are provided to better collect the treated water.

In the present invention, the size and configuration of the water collecting channel are not particularly limited, and for example, the cross section of the water collecting channel may be U-shaped, V-shaped, or other shapes. The water collection tank is provided with one or more water collection holes, preferably a plurality of water collection holes, along the length direction. The cross section of the water collecting hole can be rectangular, triangular or other shapes.

In the utility model, the upper side of the box body is connected with an oil remover for removing the oil residue floating on the water surface. The configuration of the degreaser is not particularly limited and may be set according to what is known in the art. For example, the degreaser may be composed of a wiper blade, a support rod and a transmission device, wherein one end of the support rod is connected with the wiper blade, and the other end is connected with the transmission device arranged on the upper side of the box body.

The utility model discloses in, the water catch bowl is connected to the delivery port to concentrate the delivery port and then discharge with the water in the water catch bowl. The water outlet and the water collecting tank are connected through an effluent weir or an effluent pipe.

The utility model provides an above-mentioned swash plate settling tank can improve the treatment effect of oil field reinjection water in the preliminary treatment stage to effectively reduce follow-up meticulous filterable processing load, and then improve the final play water quality of water of oil field reinjection water.

Drawings

The present invention will be further explained with reference to the drawings and examples.

FIG. 1 is a schematic diagram of an oil field reinjection water treatment process applied by the present invention;

fig. 2 is a schematic cross-sectional view of the inclined plate settling tank of the present invention;

fig. 3 is a schematic cross-sectional view taken along line a-a of fig. 2.

Detailed Description

Specific embodiments of the present invention will be described below, however, it should be understood that the following embodiments are presented for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, descriptions of well-known structures, components, and functions thereof will be omitted below in order not to obscure the concept of the present invention and conciseness.

Fig. 1 is an example of an oilfield reinjection water treatment process to which the present invention may be applied. In fig. 1, a flocculant and a coagulant aid are added before produced water (sewage) from an oil field enters a settling tank through a sewage tank. The main purpose is to flocculate the suspended matter in the sewage and at the same time to remove a part of the suspended matter. Then, adding corrosion inhibitor and bactericide, and then sending the sewage into an inclined plate settling tank for settling to remove most suspended matters and remove part of floating oil and sterilize. And then, the sewage enters a purification water tank finally after high-efficiency rotational flow air flotation and three-stage filtration treatment.

It should be noted that fig. 1 is only an example of the oil field reinjection water treatment process, and does not mean that the inclined plate settling tank of the present invention must be connected with a settling tank before and/or with a high efficiency cyclone air-flotation device after, but the settling tank and/or the high efficiency cyclone air-flotation device may be omitted according to the water quality of the sewage, the treatment efficiency of the inclined plate settling tank, the design load of each device, and the like.

Figure 2 is an example of the inclined plate settling tank of the present invention showing the cross section of the inclined plate settling tank. In fig. 2, the inclined plate settling tank includes: a box body 1; a water inlet 2; a flow stabilizer 3; a ramp region 4; a sludge hopper 5; a water collection tank 6; an oil remover 7; and a water outlet 8, wherein the water inlet 2 and the water outlet 8 are respectively arranged at the opposite sides of the box body 1; the flow stabilizing plate 3 is fixed on the box body 1, and a space allowing inflow water to pass through is reserved at the lower part of the flow stabilizing plate; the inclined plate area 4 is fixed between the flow stabilizing plate 3 and the box body 1 and comprises a first inclined plate area 4A and a second inclined plate area 4B, wherein the inclined directions of inclined plates of the first inclined plate area 4A and the second inclined plate area 4B are opposite, and the inclined angle of the inclined plate of the first inclined plate area 4A is larger than that of the inclined plate of the second inclined plate area 4B; the sludge hopper 5 is arranged below the box body 1; the water collecting grooves 6 are fixed at two sides of the box body 1 and are connected with the water outlet 8; and an oil eliminator 7 is connected to the upper side of the tank 1.

Preferably, the water is fed by a water inlet pipe, i.e. the water inlet 2 is a pipe, and the material and size of the pipe are not particularly limited.

Preferably, the space between the lower portion of the stabilizer 3 and the case 1 has a rectangular cross-section.

Preferably, the ratio of the height of the first ramp region 4A to the height of the second ramp region 4B is 1:1.

Preferably, the swash plate inclination angle of the first swash plate region 4A is 15 degrees larger than that of the second swash plate region 4B.

Preferably, the pitch of the swash plates of the first swash plate region 4A is not smaller than the pitch of the swash plates of the second swash plate region 4B.

Preferably, the water collection tank 6 is provided with a plurality of water collection holes W along a length direction thereof. Wherein the cross-section of the water collecting hole W is preferably rectangular or triangular, as shown in fig. 3.

Preferably, the water outlet 8 and the water collection tank 6 are connected by an effluent weir.

Further, the sludge hopper 5, the oil remover 7, and other structures and/or components not described in detail are provided as generally known in the art, without particular limitation.

Examples

An inclined plate settling tank as shown in fig. 2 is manufactured, wherein the water inlet 2 is a pipe, the cross section of the space between the lower part of the flow stabilizing plate 3 and the tank body 1 is rectangular, the height ratio of the first inclined plate area 4A to the second inclined plate area 4B is 1:1, the inclined plate inclination angle of the first inclined plate area 4A is 15 degrees larger than that of the second inclined plate area 4B, the interval of the inclined plates of the first inclined plate area 4A is 1.25 times that of the second inclined plate area 4B, the number of the water collecting grooves 6 is three, the cross section of the water collecting holes W is rectangular, and other structures and/or parts are as described above.

In the inclined plate settling tank manufactured as above, the sewage added with the corrosion inhibitor and the bactericide enters the tank body through the water inlet pipe 2, bypasses the stabilizing plate 3 to eliminate the impact of turbulence on the system and further flocculate. The wastewater then passes through the first and

second ramp zones

4A, 4B in sequence, the flocculated particles settle under the action of gravity and fall into a sludge hopper, and the treated water flows upward out of the ramp zones. Then, the treated water is subjected to oil slick removal by the degreaser 7 and then collected in the water collection tank 6 through the plurality of water collection holes W. Finally, the water in the water collection tank 6 reaches the water outlet 8 via the water outlet weir, and finally enters the next treatment device.

Comparative example

An inclined plate settling tank was manufactured in the same manner as in the examples, except that only one inclined plate region was included. That is, the first swash plate region 4A and the second swash plate region 4B are not distinguished, but a unified swash plate region 4' is provided at their corresponding positions. Here, the swash plate of the swash plate region 4' is provided the same as the swash plate of the second swash plate region 4B in the embodiment, except for the height thereof.

Examples of the experiments

The inclined plate settling tanks manufactured in examples and comparative examples were applied to the oilfield reinjection water treatment process shown in fig. 1, and the quality of inlet and outlet water was measured, and the results thereof are shown in table 1 below.

The detection method and the steps of each water quality index are carried out according to corresponding national and industrial standards, which are well known by the technicians in the field, and thus, the detailed description is omitted.

TABLE 1

In the experimental examples, the water inflow in the examples and comparative examples was controlled so that the water quality indexes thereof were substantially the same. As can be seen from table 1, the inclined plate settling tanks of the examples and comparative examples did not change the pH of the wastewater. In addition, the reduction rate of the content of dissolved oxygen and saprophytic bacteria in the effluent of the comparative example is larger than that of the example, but the reduction rate is within an acceptable range and belongs to auxiliary indexes. Compared with the comparative example, the inclined plate settling tank manufactured by using the example can improve the removal rate of suspended matters, oil content, sulfate reducing bacteria, iron content and sulfur content by about 13.5%, 15.9%, 40.7%, 49.9%, 74.8% and 35.2%, respectively, and show excellent pretreatment effect.

Therefore, the utility model discloses an inclined plate settling tank can improve the preliminary treatment effect of oil field reinjection water to effectively reduce follow-up meticulous filterable processing load, and finally improve the quality of water of oil field reinjection water.

Claims

1. An inclined plate settling tank for oilfield reinjection water, comprising: a box body (1); a water inlet (2); a flow stabilizer (3); a ramp region (4); a sludge hopper (5); a water collection tank (6); an oil remover (7); and a water outlet (8), characterized in that: the water inlet (2) and the water outlet (8) are respectively arranged on the opposite sides of the box body (1); the flow stabilizing plate (3) is fixed on the box body (1), and a space allowing inflow water to pass through is reserved at the lower part of the flow stabilizing plate; the swash plate region (4) is fixed between the flow stabilizer (3) and the box body (1) and comprises a first swash plate region (4A) and a second swash plate region (4B), wherein the inclination directions of the swash plates of the first swash plate region (4A) and the second swash plate region (4B) are opposite and the inclination angles in acute angles are each 30 to 70 degrees, and the swash plate inclination angle of the first swash plate region (4A) is greater than that of the second swash plate region (4B); the sludge hopper (5) is arranged below the box body (1); the water collecting grooves (6) are fixed on two sides of the box body (1) and are connected with the water outlet (8); and the oil remover (7) is connected with the upper side of the box body (1).

2. The inclined plate settling tank for oilfield reinjection water according to claim 1, wherein the water inlet (2) is a pipe.

3. The inclined plate settling tank for oilfield reinjection water according to any one of claims 1 to 2, wherein the height ratio of the first inclined plate zone (4A) to the second inclined plate zone (4B) is from 1:3 to 3: 1.

4. The inclined plate settling tank for oilfield reinjection water according to any one of claims 1 to 2, wherein the height ratio of the first inclined plate zone (4A) to the second inclined plate zone (4B) is 1:1.

5. The inclined plate settling tank for oilfield reinjection water according to any one of claims 1 to 2, wherein the inclined plates of the inclined plate zone (4) have an inclination angle at an acute angle of 30 to 70 degrees.

6. The inclined plate settling tank for oilfield reinjection water according to any one of claims 1 to 2, wherein the inclined plate inclination angle of the first inclined plate zone (4A) is greater than the inclined plate inclination angle of the second inclined plate zone (4B) by 5 degrees, 10 degrees, 15 degrees, 20 degrees, 25 degrees, 30 degrees, 35 degrees, or 40 degrees.

7. The inclined plate settling tank for oilfield reinjection water according to any one of claims 1 to 2, wherein the pitch of the inclined plates of the first inclined plate zone (4A) is not smaller than the pitch of the inclined plates of the second inclined plate zone (4B).

8. The inclined plate settling tank for oilfield reinjection water according to any one of claims 1 to 2, wherein the water collection tank (6) is provided with a plurality of water collection holes along a length direction thereof, and the water collection holes have a rectangular, triangular cross-section.