Device for treating gas field produced water with oil content ranging from 30 mg / L to 500 mg / L

Abstract

The utility model relates to a gas field produced water treatment device with the oil content ranging from 30 mg / L to 500 mg / L. The gas field produced water treatment device comprises a demulsification unit provided with a water outlet and used for achieving oil-water separation of gas field produced water in the demulsification unit; the air floatation unit is provided with a drain outlet, the air floatation unit is connected with the water outlet of the demulsification unit, and the air floatation unit is used for removing oil stains and suspended solids in the gas field produced water; the sludge collecting unit is connected with the sewage draining exit of the air floatation unit; the plate-and-frame filter pressing unit is connected with the sludge collecting unit, the plate-and-frame filter pressing unit comprises at least two groups of plate-and-frame filter presses, the diameter of a filter plate in the front group of plate-and-frame filter presses is larger than that of a filter plate in the rear group of plate-and-frame filter presses, and the plate-and-frame filter pressing unit is connected with the sludge collecting unit. And the diameters of the filter plates in each group of plate-and-frame filter presses are sequentially reduced along the direction from the inlet to the outlet of the plate-and-frame filter press. According to the gas field produced water treatment device, gas field produced water with the oil content ranging from 30 mg / L to 500 mg / L can be treated, the treatment process is simple, the treatment cost is reduced, and the treatment efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of gas field produced water treatment, especially to a kind of gas field produced water treatment device for oil content in the range of 30mg / L-500mg / L. BACKGROUND

[0002] In the gas well exploitation process, due to the low acid liquid flowback rate of the gas well, the phenomenon of acid fracturing residual liquid remaining in the formation exists. In order to improve the production of the gas well and fully release the productivity, the well pattern is usually reconstructed by acidizing and fracturing method, and part of the reservoir fractures are effectively developed. During the exploitation of the gas well, the formation residual liquid is carried to the ground with gas, and enters the subsequent process after gas-liquid separation. Among them, there are oil and asphalt impurities (fracturing fluid injection) in the liquid. In order to ensure the safe and stable operation of the natural gas desulfurization device, the related oil and gas field produced water needs to be disposed and effectively utilized.

[0003] The related technology discloses a recycling resource waste emulsion treatment device, which is characterized by comprising a water collecting pool, an acid precipitation demulsifier, a flocculator, a filter press, an evaporation pipe and a separator arranged in sequence. The water collecting pool and the acid precipitation demulsifier are connected by a water pipe, and the acid precipitation demulsifier and the flocculator are connected by a water pipe. The flocculator and the filter press are connected by a bottom water pipe. The right side of the filter press is connected to the separator by an evaporation pipe. The left side of the separator is provided with a liquid outlet valve. The upper side of the evaporation pipe is provided with a condenser pipe, and the lower end of the condenser pipe is connected to a water purifier.

[0004] However, the process system for oil and gas field produced water resource treatment provided by the related technology has the problems of poor effect and high treatment cost for the treatment of low content, such as low oil content of 30mg / L-500mg / L of low oil content gas field produced water. UTILITY MODEL CONTENT

[0005] The utility model provides a kind of gas field produced water treatment device for oil content in the range of 30mg / L-500mg / L, at least can solve the process system for oil and gas field produced water resource treatment provided by the related technology has the problems of poor effect and high treatment cost for the treatment of low content, such as low oil content of 30mg / L-500mg / L of low oil content gas field produced water.

[0006] The utility model provides a kind of gas field produced water treatment device for oil content in the range of 30mg / L-500mg / L, as shown in the following scheme:

[0007] A kind of gas field produced water treatment device for oil content in the range of 30mg / L-500mg / L, the oil content of the gas field produced water is 30mg / L-500mg / L, and the gas field produced water presents emulsification, the device includes:

[0008] a demulsification unit having a water outlet for realizing oil-water separation of the produced water in the demulsification unit;

[0009] a flotation unit having a sludge outlet, the flotation unit being connected with the water outlet of the demulsification unit, the flotation unit being used for removing oil stains and suspended solids in the produced water;

[0010] a sludge collection unit connected with the sludge outlet of the flotation unit;

[0011] a plate-and-frame filter unit connected with the sludge collection unit, the plate-and-frame filter unit comprising at least two groups of plate-and-frame filter presses, wherein the diameter of the filter plate in the former group of plate-and-frame filter presses is greater than the diameter of the filter plate in the latter group of plate-and-frame filter presses, and the diameter of the filter plate in each group of plate-and-frame filter presses decreases successively along the direction from the inlet to the outlet of the plate-and-frame filter press.

[0012] In an embodiment, further comprising: an oily sludge detection and recycling treatment unit;

[0013] The oily sludge detection and recycling treatment unit is arranged at the outlet of the plate-and-frame filter unit, and is used for recycling the produced water through the plate-and-frame filter unit again when the oily sludge in the produced water treated by the plate-and-frame filter unit does not meet the preset standard.

[0014] In an embodiment, the oily sludge detection and recycling treatment unit comprises: an oil stain detection unit and a first recycling treatment pipeline;

[0015] The oil stain detection unit is arranged at the outlet of the plate-and-frame filter unit;

[0016] One end of the first recycling treatment pipeline is connected with the outlet of the plate-and-frame filter unit, and the other end is connected with the flotation unit.

[0017] In an embodiment, the oily sludge detection and recycling treatment unit further comprises a first control valve;

[0018] The first control valve is arranged on the first recycling treatment pipeline.

[0019] In an embodiment, the oil stain detection unit comprises any one of an oil quality analyzer, an infrared spectrometer, a chromatograph, a mass spectrometer or an oil film thickness gauge.

[0020] In an embodiment, further comprising: a demulsification detection and recycling treatment unit;

[0021] The demulsification detection and circulation treatment unit is arranged between the demulsification unit and the air floatation unit, and is used for treating the gas field produced water again by the demulsification unit when the oil-water separation effect of the gas field produced water treated by the demulsification unit does not meet the preset effect.

[0022] In one embodiment, the demulsification detection and circulation treatment unit comprises an oil content detector and a second circulation treatment pipeline.

[0023] The oil content detector is arranged between the demulsification unit and the air floatation unit.

[0024] One end of the second circulation treatment pipeline is connected with the demulsification unit, and the other end is connected with the air floatation unit.

[0025] In one embodiment, the demulsification detection and circulation treatment unit further comprises a second control valve.

[0026] The second control valve is arranged on the second circulation treatment pipeline.

[0027] In one embodiment, a temporary storage unit is further included, and the temporary storage unit is connected with the demulsification unit.

[0028] In one embodiment, a sludge collection unit is further included, and the sludge collection unit is connected with the demulsification unit and the plate-and-frame filter pressing unit, and is used for collecting sludge treated by the air floatation unit and the plate-and-frame filter pressing unit.

[0029] Compared with the prior art, the oil field produced water treatment device can treat the gas field produced water with an oil content of 30 mg / L-500 mg / L, improve the treatment effect, and meet the various indexes of standard treated water. BRIEF DESCRIPTION OF DRAWINGS

[0030] The utility model will be described in more detail below based on the embodiments and with reference to the drawings.

[0031] Figure 1 is the structure schematic view of the oil field produced water treatment device in the embodiment of the utility model.

[0032] Reference signs:

[0033] 1 - demulsification unit, 2 - air floatation unit, 3 - sludge collection unit, 4 - plate and frame filter press unit, 5 - oil stain detection unit, 6 - first circulating treatment pipeline, 7 - first control valve, 8 - oil content detector, 9 - second circulating treatment pipeline, 10 - second control valve, 11 - temporary storage unit. DETAILED DESCRIPTION

[0034] The utility model will be further explained below in combination with the drawings.

[0035] Please see Figure 1 The utility model discloses a kind of gas field produced water processing devices for oil content in the range of 30mg / L-500mg / L, and gas field produced water is in the range of 30mg / L-500mg / L, and gas field produced water presents emulsification, device includes: demulsification unit 1, air floatation unit 2, sludge collection unit 3 and plate and frame filter press unit 4.Wherein, demulsification unit 1 has water outlet, for making gas field produced water realize oil-water separation in demulsification unit 1;Air floatation unit 2 has blow-off port, air floatation unit 2 is connected with the water outlet of demulsification unit 1, air floatation unit 2 is used to remove oil stain and suspended solids in gas field produced water;Sludge collection unit 3 is connected with the blow-off port of air floatation unit 2;Plate and frame filter press unit 4 is connected with sludge collection unit 3, and plate and frame filter press unit 4 includes at least two groups of plate and frame filter press, wherein, the diameter of filter plate in the former group of plate and frame filter press is greater than the diameter of filter plate in the latter group of plate and frame filter press, and the diameter of filter plate in each group of plate and frame filter press is sequentially reduced along the direction of inlet to outlet of plate and frame filter press.

[0036] The utility model discloses a kind of gas field produced water processing devices for oil content in the range of 30mg / L-500mg / L, and gas field produced water is in the range of 30mg / L-500mg / L, and gas field produced water presents emulsification, device includes: demulsification unit 1, air floatation unit 2, sludge collection unit 3 and plate and frame filter press unit 4.Wherein, demulsification unit 1 has water outlet, for making gas field produced water realize oil-water separation in demulsification unit 1;Air floatation unit 2 has blow-off port, air floatation unit 2 is connected with the water outlet of demulsification unit 1, air floatation unit 2 is used to remove oil stain and suspended solids in gas field produced water;Sludge collection unit 3 is connected with the blow-off port of air floatation unit 2;Plate and frame filter press unit 4 is connected with sludge collection unit 3, and plate and frame filter press unit 4 includes at least two groups of plate and frame filter press, wherein, the diameter of filter plate in the former group of plate and frame filter press is greater than the diameter of filter plate in the latter group of plate and frame filter press, and the diameter of filter plate in each group of plate and frame filter press is sequentially reduced along the direction of inlet to outlet of plate and frame filter press.

[0037] The demulsification unit 1 can realize efficient demulsification and oil-water separation of the gas field produced water, thereby improving oil and gas production and reducing environmental pollution. Exemplarily, the demulsification unit 1 can adopt a tubular electrocoagulation demulsification device to utilize the special structure of an electrocoagulation reactor, promote demulsification and coalescence of emulsified oil droplets through interaction of electrode plates and a sound field.

[0038] The air flotation unit 2 can realize purification of the gas field produced water. Exemplarily, the air flotation unit 2 can be realized by air dispersion flotation, dissolved air flotation or electrolytic flotation. The air dispersion flotation refers to dispersing air into the gas field produced water by micro-porous aeration or shearing bubble to form a large number of micro-bubbles, so that oil droplets and suspended matters float up. The dissolved air flotation includes dissolved air vacuum flotation and pressurized dissolved air flotation. The former causes air to dissolve in the gas field produced water to form micro-bubbles under vacuum conditions, and the latter causes air to dissolve in the gas field produced water to form micro-bubbles under pressure conditions. The electrolytic flotation refers to causing hydrogen and oxygen bubbles to be generated by electrolysis to make oil droplets and suspended matters float up. The air flotation unit 2 can adopt any of the above manners, and the embodiment of the utility model does not limit this.

[0039] The sludge collection unit 3 can be a sludge collection tank, and an inlet of the sludge collection tank is connected with a blow-off port of the air flotation unit 2.

[0040] In an optional embodiment, the gas field produced water treatment device provided by the embodiment of the utility model for the gas field produced water with oil content in the range of 30 mg / L-500 mg / L further includes an oily sludge detection and circulation treatment unit. The oily sludge detection and circulation treatment unit is arranged at an outlet of the plate-and-frame filter pressing unit 4, and is used to treat the gas field produced water again by the plate-and-frame filter pressing unit 4 when the oily sludge in the gas field produced water treated by the plate-and-frame filter pressing unit 4 does not meet the preset standard.

[0041] The embodiment of the utility model detects the content of the oily sludge in the treated water at the outlet of the plate-and-frame filter pressing unit 4. When the content of the oily sludge in the treated water at the outlet of the plate-and-frame filter pressing unit 4 is greater than the first preset content, the gas field produced water is treated again by the plate-and-frame filter pressing unit 4 through the oily sludge detection and circulation treatment unit of the embodiment of the utility model. When the content of the oily sludge in the treated water at the outlet of the plate-and-frame filter pressing unit 4 is less than the first preset content, the treated gas field produced water is discharged. In this way, the treatment effect of the gas field produced water can be improved.

[0042] The first preset content can be set according to actual processing needs, and embodiments of the present application do not limit this.

[0043] In an alternative embodiment, the oil-containing sludge detection and recycling treatment unit comprises an oil stain detection unit 5 and a first recycling treatment pipeline 6; the oil stain detection unit 5 is arranged at the outlet of the plate-and-frame filter pressing unit 4; one end of the first recycling treatment pipeline 6 is connected to the outlet of the plate-and-frame filter pressing unit 4, and the other end is connected to the air flotation unit 2.

[0044] In an alternative embodiment, the oil-containing sludge detection and recycling treatment unit further comprises a first control valve 7; the first control valve 7 is arranged on the first recycling treatment pipeline 6.

[0045] When the content of the oil-containing sludge in the treated water at the outlet of the plate-and-frame filter pressing unit 4 is greater than the first preset content, the treated gas field produced water is caused to pass through the first recycling treatment pipeline 6 and enter the air flotation unit 2 again for removal of oil stains and suspended solids by opening the first control valve 7. When the content of the oil-containing sludge in the treated water at the outlet of the plate-and-frame filter pressing unit 4 is less than the first preset content, the treated water is stopped from being treated again by closing the first control valve 7.

[0046] In an alternative embodiment, the oil stain detection unit 5 comprises any one of an oil quality analyzer, an infrared spectrometer, a chromatograph, a mass spectrometer or an oil film thickness gauge.

[0047] In an alternative embodiment, the gas field produced water treatment device for gas field produced water with an oil content in the range of 30 mg / L-500 mg / L provided by the embodiments of the present application further comprises a demulsification detection and recycling treatment unit; the demulsification detection and recycling treatment unit is arranged between the demulsification unit 1 and the air flotation unit 2, and is used for causing the gas field produced water treated by the demulsification unit 1 to pass through the demulsification unit 1 again for treatment when the oil-water separation effect of the gas field produced water treated by the demulsification unit 1 does not meet a preset effect.

[0048] The embodiments of the present application detect the content of the oil-containing sludge in the treated water at the outlet of the demulsification unit 1, cause the gas field produced water to pass through the demulsification unit 1 again for treatment by the demulsification detection and recycling treatment unit of the embodiments of the present application when the content of the oil-containing sludge at the outlet of the demulsification unit 1 is greater than the second preset content, and cause the treated gas field produced water to pass into the air flotation unit 2 when the content of the oil-containing sludge in the treated water at the outlet of the demulsification unit 1 is less than the second preset content. In this way, the treatment effect of the gas field produced water can be improved. Furthermore, the oil-containing sludge is detected in advance between the demulsification unit 1 and the air flotation unit 2, the content of the oil-containing sludge is further reduced, and the treatment efficiency of the gas field produced water is improved.

[0049] The second preset content can be set according to actual processing needs, and embodiments of the utility model do not make limitation to this.

[0050] In an alternative embodiment, the demulsification detection and recycling treatment unit comprises an oil content detector 8 and a second recycling treatment pipeline 9; the oil content detector 8 is arranged between the demulsification unit 1 and the air floatation unit 2; one end of the second recycling treatment pipeline 9 is connected with the demulsification unit 1, and the other end is connected with the air floatation unit 2.

[0051] In an alternative embodiment, the demulsification detection and recycling treatment unit further comprises a second control valve 10; the second control valve 10 is arranged on the second recycling treatment pipeline 9.

[0052] When the content of the oily sludge in the treated water at the water outlet of the demulsification unit 1 is greater than the second preset content, the treated gas field produced water is caused to pass through the second recycling treatment pipeline 9 into the demulsification unit 1 again to perform demulsification treatment of the gas field produced water by opening the second control valve 10. When the content of the oily sludge in the treated water at the water outlet of the demulsification unit 1 is less than the second preset content, the second demulsification treatment of the treated gas field produced water is stopped by closing the second control valve 10.

[0053] In an alternative embodiment, a temporary storage unit 11 is further included, and the temporary storage unit 11 is connected with the demulsification unit 1.

[0054] The temporary storage unit 11 can be a temporary storage tank adapted to actual processing needs.

[0055] In an alternative embodiment, a sludge collection unit 3 is further included, and the sludge collection unit 3 is connected with the demulsification unit 1 and the plate-and-frame filter press unit 4, and the sludge collection unit 3 is used to collect the sludge treated by the air floatation unit 2 and the plate-and-frame filter press unit 4.

[0056] The sludge collection unit 3 can be a sludge collection tank adapted to actual processing needs. The demulsification unit 1 is further provided with a sludge discharge port, and the sludge collection unit 3 is connected with the sludge discharge port of the demulsification unit 1. The sludge collection unit 3 is connected with a sludge outlet of the plate-and-frame filter press in the plate-and-frame filter press unit 4.

[0057] Although the utility model has been described with reference to the preferred embodiments, various improvements can be made and equivalent parts can be replaced without departing from the scope of the utility model. In particular, the technical features mentioned in each embodiment can be combined in any way as long as there is no structural conflict. The utility model is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A device for treating gas field produced water having an oil content in the range of 30 mg / L - 500 mg / L, characterized in that, The device comprises: a demulsification unit having a water outlet for realizing oil-water separation of the produced water in the gas field in the demulsification unit; a gas floatation unit having a sewage outlet, the gas floatation unit being connected with the water outlet of the demulsification unit, and the gas floatation unit being used for removing oil stains and suspended solids in the produced water in the gas field; a sludge collecting unit connected with the sewage outlet of the gas floatation unit; a plate-and-frame filter unit connected with the sludge collecting unit, the plate-and-frame filter unit comprising at least two groups of plate-and-frame filter presses, wherein the diameter of the filter plate in the former group of plate-and-frame filter presses is greater than the diameter of the filter plate in the latter group of plate-and-frame filter presses, and the diameter of the filter plate in each group of plate-and-frame filter presses decreases successively along the direction from the inlet to the outlet of the plate-and-frame filter press.

2. The device for treating gas field produced water with oil content in the range of 30 mg / L - 500 mg / L according to claim 1, characterized in that, Further comprising: an oily sludge detection and circulation treatment unit; the oily sludge detection and circulation treatment unit being arranged at the outlet of the plate-and-frame filter unit, and the oily sludge detection and circulation treatment unit being used for re-treating the produced water in the gas field through the plate-and-frame filter unit again when the oily sludge in the produced water in the gas field treated through the plate-and-frame filter unit does not meet the preset standard.

3. The device for treating gas field produced water with oil content in the range of 30 mg / L - 500 mg / L according to claim 2, characterized in that, the oily sludge detection and circulation treatment unit comprising an oil stain detection unit and a first circulation treatment pipeline; the oil stain detection unit being arranged at the outlet of the plate-and-frame filter unit; one end of the first circulation treatment pipeline being connected with the outlet of the plate-and-frame filter unit, and the other end of the first circulation treatment pipeline being connected with the gas floatation unit.

4. The device for treating gas field produced water with oil content in the range of 30 mg / L - 500 mg / L according to claim 3, characterized in that, the oily sludge detection and circulation treatment unit further comprising a first control valve; the first control valve being arranged on the first circulation treatment pipeline.

5. The device for treating gas field produced water with oil content in the range of 30 mg / L - 500 mg / L according to claim 3, characterized in that, the oil stain detection unit comprising any one of an oil quality analyzer, an infrared spectrometer, a chromatograph, a mass spectrometer or an oil film thickness gauge.

6. The device for treating gas field produced water with oil content in the range of 30 mg / L - 500 mg / L according to claim 1, characterized in that, Further comprising: a demulsification detection and circulation treatment unit; the demulsification detection and circulation treatment unit being arranged between the demulsification unit and the gas floatation unit, and the demulsification detection and circulation treatment unit being used for re-treating the produced water in the gas field through the demulsification unit again when the oil-water separation effect in the produced water in the gas field treated through the demulsification unit does not meet the preset effect.

7. The device for treating gas field produced water containing oil in the range of 30 mg / L-500 mg / L according to claim 6, characterized in that, the demulsification detection and circulation treatment unit comprising an oil content detector and a second circulation treatment pipeline; the oil content detector being arranged between the demulsification unit and the gas floatation unit; one end of the second circulation treatment pipeline being connected with the demulsification unit, and the other end of the second circulation treatment pipeline being connected with the gas floatation unit.

8. The device for treating gas field produced water containing oil in the range of 30 mg / L-500 mg / L according to claim 7, characterized in that, the demulsification detection and circulation treatment unit further comprising a second control valve; the second control valve being arranged on the second circulation treatment pipeline.

9. The device for treating gas field produced water containing oil in the range of 30 mg / L - 500 mg / L according to claim 1, characterized in that, Further comprising a temporary storage unit connected with the demulsification unit.

10. The device for treating gas field produced water having oil content in the range of 30 mg / L - 500 mg / L as claimed in claim 1, wherein, Further comprising: a sludge collecting unit connected with the demulsification unit and the plate-and-frame filter unit, and the sludge collecting unit being used for collecting the sludge treated by the gas floatation unit and the plate-and-frame filter unit.

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