CN112093941A - Environment-friendly fracturing flow-back fluid wastewater profile control and flooding technology - Google Patents
Environment-friendly fracturing flow-back fluid wastewater profile control and flooding technology Download PDFInfo
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- CN112093941A CN112093941A CN202011005611.7A CN202011005611A CN112093941A CN 112093941 A CN112093941 A CN 112093941A CN 202011005611 A CN202011005611 A CN 202011005611A CN 112093941 A CN112093941 A CN 112093941A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/04—Flow arrangements
- C02F2301/046—Recirculation with an external loop
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
Abstract
The invention relates to the field of oilfield wastewater treatment and utilization, in particular to an environment-friendly fracturing flow-back fluid wastewater profile control and flooding technology, which comprises the following steps of: comprises the processes of sand setting, oil removal and pre-oxidation; secondly, flocculating and precipitating, namely adding a reactant into the water pretreated in the first step, and precipitating after a period of reaction; thirdly, air flotation oil removal: adding a medicament into the wastewater after the second step for high-efficiency air flotation oil removal; fourthly, a filtering process and a wellhead injection construction process: and (4) performing multistage filtration on the wastewater after the third step, and injecting the wastewater into a construction process pipeline through a wellhead to realize wastewater profile control. The invention adopts the technical scheme of simple wastewater treatment and compound deep profile control and flooding to realize the effects of changing waste of the flowback fluid into valuable and recycling the waste, achieves harmless utilization, reduces environmental pollution, protects environment, reduces emission, realizes social value, and has wide application in the aspect of resource utilization of oilfield fracturing fluid treatment in the profile control direction.
Description
Technical Field
The invention relates to the field of oilfield wastewater treatment and utilization, in particular to a process for environment-friendly treatment of fracturing flow-back wastewater.
Background
In the production process of an oil field, in order to improve the yield, various measures need to be taken for a production well, fracturing is one of the measures, a large amount of liquid is discharged to the ground after fracturing, and if the liquid is not properly treated, the environment is polluted. The most main treatment method at present is reinjection after treatment, so that a large amount of solid waste is generated during treatment, and secondary pollution is also caused; because the national requirements for environmental protection are more and more strict, a treatment method which has low discharge and less pollution and can effectively utilize the fracturing flow-back fluid is urgently needed to be developed.
Disclosure of Invention
In order to solve one of the problems, the invention provides an environment-friendly fracturing flow-back fluid wastewater profile control and flooding process, which comprises the following steps of: comprises the processes of sand setting, oil removal and pre-oxidation;
secondly, flocculating and precipitating, namely adding a reactant into the water pretreated in the first step, and precipitating after a period of reaction;
thirdly, air flotation oil removal: adding a medicament into the wastewater after the second step for high-efficiency air flotation oil removal;
fourthly, a filtering process and a wellhead injection construction process: and (4) performing multistage filtration on the wastewater after the third step, and injecting the wastewater into a construction process pipeline through a wellhead to realize wastewater profile control.
Furthermore, the sand settling, oil removing and pre-oxidation processes are a process of firstly collecting bottom sand settling and upper oil removing of the fracturing flowback fluid, and then adding an oxidant to realize oxidation gel breaking and viscosity reduction.
Further, the added reactant is a coagulant or a precipitator.
Further, the process of storing water through the middle water pool is also included after the air flotation oil removal.
Furthermore, a filtering process is arranged behind the middle water tank.
Further, the filtering process sequentially comprises the processes of quartz sand filtering, activated carbon filtering and precise filtering system filtering.
Further, the quartz sand filtration comprises a process that suspended particles in water are sequentially filtered by a high-middle fine filter layer.
Further, the activated carbon filtration comprises a process that the colored substances and suspended particles in the water are adsorbed by the activated carbon.
Further, the microfiltration system includes a process of filtration by a mechanical interception device.
Further, the wellhead injection construction process comprises the step of carrying out construction in a wellhead injection mode by power equipment on the site after flexible particles or gel is subjected to fluid distribution on the site.
The invention has the beneficial effects that: the invention adopts the technical scheme of simple wastewater treatment and compound deep profile control and flooding to realize the effect of changing waste of the flowback fluid into valuable and recycling the waste, achieves harmless utilization, realizes the purposes of reducing environmental pollution, creating economic value by increasing oil and lowering water, protecting environment and reducing emission to realize social value, and has wide application in resource utilization of oilfield fracturing fluid treatment in the profile control direction.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1: a schematic flow chart of the fracturing flow-back fluid treatment process of the invention;
FIG. 2: the invention is a plan view schematic of an injection wellhead wellsite layout.
Detailed Description
The following detailed description of the preferred embodiments of the present invention will be provided in conjunction with the drawings and examples, so that how to implement the present invention by applying technical means to solve the technical problems and achieve the technical effects can be fully understood and implemented.
The invention is further illustrated by the following preferred examples: the invention will be better understood from the following description of preferred embodiments. However, those skilled in the art will readily appreciate that the specific material ratios, process conditions and results thereof described in the examples are illustrative only and should not be taken as limiting the invention as detailed in the claims.
As shown in figure 1, the environment-friendly fracturing flow-back fluid wastewater profile control and flooding process is characterized by comprising the following steps of: comprises the processes of sand setting, oil removal and pre-oxidation;
secondly, flocculating and precipitating, namely adding a reactant into the water pretreated in the first step, and precipitating after a period of reaction;
thirdly, air flotation oil removal: adding a medicament into the wastewater after the second step for high-efficiency air flotation oil removal;
fourthly, a filtering process and a wellhead injection construction process: and (4) performing multistage filtration on the wastewater after the third step, and injecting the wastewater into a construction process pipeline through a wellhead to realize wastewater profile control.
As a preferred embodiment of the present invention, according to the water quality conditions of the inlet and outlet water and the water quality characteristics of the slurry wastewater and the fracturing flow-back fluid in the project, the project decides to adopt a pretreatment + flocculation precipitation + air flotation degreasing + filtration + wellhead injection construction process to realize wastewater profile control, wherein all processes at the front end of the filtration belong to a fracturing flow-back fluid treatment process stage, and the rear end of the filtration process is a wellhead injection construction process stage, as shown in fig. 1, the fracturing flow-back fluid treatment process flow diagram is provided, and the process is preferably implemented by skid-mounted equipment; the pre-oxidation process is that firstly, the fracturing flow-back fluid is collected with bottom settled sand and upper part deoiled, then the oxidant is added to realize the process of oxidizing gel breaking and reducing viscosity, the pre-oxidation is that the oxidant is used to destroy and degrade the gel in the fracturing flow-back wastewater, so that the smooth progress of the subsequent process, the use amount of the flocculant and the flocculation effect are reduced, and the reutilization performance and stability of the treatment fluid are improved; flocculating and precipitating, namely adding reactants such as polyacrylamide, polyaluminium chloride and the like into the pretreated water, reacting for a period of time, and separating and removing large-particle suspended matters and fine silt again to provide an effect; the air flotation oil removal is completed by an air flotation system, the system comprises a dissolved air pump, a releaser, an air compressor, a residue and mud scraper and other equipment, the process is efficiently and cooperatively implemented, the effects of one-key start and stop and full-automatic operation can be realized, the system is connected and arranged after a flocculation precipitation process, a certain amount of demulsifier, PAM flocculant and PAC coagulant aid are respectively added into water in the running process of the system, so that the oil phase in the water is demulsified and then further separated from the water phase, the solid phase is rapidly coagulated into clusters under the action of the mixed flocculant, floating to the water surface under the carrying effect of micro bubbles formed by an air floatation gas making system, then uniformly collecting to a scum and bottom mud collecting tank by a scum collecting system, periodically discharging a solid phase with a large specific gravity formed at the bottom of an air floatation device for a long time into the scum and bottom mud collecting tank, and carrying out sludge outward transportation and filtrate recovery after the sludge in a sludge tank is subjected to pressure filtration by a sludge filter press; the effluent after the air floatation oil removal treatment enters an intermediate water tank for collection and standing; enabling the effluent of the intermediate water tank to enter a filtering process stage, wherein the filtering process stage comprises a quartz sand filter, an activated carbon filter and a precise filtering system, so that the fracturing flow-back fluid finally reaches the standard of compound gel; specifically, the quartz sand filtration comprises a process that suspended particles in water are sequentially filtered by a high-middle-fine filter layer, the activated carbon filtration comprises a process that colored substances and suspended particles in water are adsorbed by activated carbon, the precise filter system comprises a process of filtering by a mechanical interception device, wastewater treated by an air floatation system is continuously pumped into a two-stage filter system, the activated carbon filter has high adsorbability, can adsorb colors in water and remove part of suspended matters, the quartz sand filter has high filtering capacity, the filter layer formed by high middle-fine particles can remove suspended particles in water to 85-90%, and conditions for further finishing water purification by subsequent precise filtration are provided, the process treatment of the invention is efficient, and if the parameter indexes of the treatment operation of the process section are as follows: the treated water amount is 30-200 square, and suspended matters: 3000-15000mg/l, the pH value of the water is 4-10, the treatment of the fracturing flow-back fluid can be completed by the fracturing flow-back fluid treatment process, and the treated water can reach the process standard of profile control water, so that the preparation is smoothly carried out in the subsequent injection construction process stage.
The following describes the injection construction process stage, as shown in fig. 2, which is a schematic plan view of the well site arrangement of the injection wellhead, the wellhead injection construction process comprises the steps of using flexible particles or gel to carry out construction in a manner of connecting a power device such as a profile control pump and the like on site after liquid is prepared through a liquid preparation tank on site, then carrying out construction through an oil pipe wellhead after a sand box of 15 meters is connected on site, specifically, according to different injected media, different ground injection devices are adopted, a flexible particle slug and a compound gel slug need to be constructed in a manner of liquid preparation on site and injection on site, a pressure reducing valve needs to be additionally arranged on the wellhead, water is discharged into a water storage tank car through a pressure relief pipeline, as shown in fig. 2, the main construction devices for completing the injection construction process comprise a plunger pump, a well site preparation tank (with a stirrer), a water storage tank, a matching manifold, a pressure gauge and the like, a liquid distribution tank (with a stirrer), skid-mounted treatment equipment, a liquid storage tank, a tank car, a duty room and the like.
The invention adopts the technical ideas of simple wastewater treatment and compound deep profile control and flooding to realize the effects of changing waste of the flowback liquid into valuable and recycling the waste, thereby achieving harmless utilization, realizing the purposes of reducing environmental pollution, increasing oil and lowering water, creating economic value, protecting environment and reducing emission to realize social value.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Claims (10)
1. The environment-friendly fracturing flow-back liquid wastewater profile control and flooding process is characterized by comprising the following steps of: comprises the processes of sand setting, oil removal and pre-oxidation;
secondly, flocculating and precipitating, namely adding a reactant into the water pretreated in the first step, and precipitating after a period of reaction;
thirdly, air flotation oil removal: adding a medicament into the wastewater after the second step for high-efficiency air flotation oil removal;
fourthly, a filtering process and a wellhead injection construction process: and (4) performing multistage filtration on the wastewater after the third step, and injecting the wastewater into a construction process pipeline through a wellhead to realize wastewater profile control.
2. The process of claim 1, wherein the sand settling, oil removal and pre-oxidation processes are processes of firstly collecting bottom sand settling and upper oil removal of the fracturing flowback fluid, and then adding an oxidant to realize oxidation gel breaking and viscosity reduction.
3. The process of claim 1, wherein the reactant is a coagulant or a precipitant.
4. The process of claim 1, wherein the air flotation de-oiling further comprises a step of storing water through an intermediate water tank.
5. The process of claim 4, wherein the intermediate pond is followed by a filtration process.
6. The process as claimed in claim 5, wherein the filtering process comprises the processes of quartz sand filtering, activated carbon filtering and precise filtering system filtering in sequence.
7. The process as claimed in claim 5, wherein the quartz sand filtration comprises a process of filtering suspended particles in water sequentially through high and medium fine filter layers.
8. The process of claim 5, wherein the activated carbon filtration comprises subjecting colored matter and suspended particles in the water to activated carbon adsorption.
9. The process of claim 5, wherein the microfiltration system comprises a process of filtration by mechanical interception means.
10. The process of any one of claims 1 to 9, wherein the wellhead injection process comprises the steps of preparing a fluid from flexible particles or gel on site, and injecting the fluid from a power plant on site through the wellhead.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011005611.7A CN112093941A (en) | 2020-09-22 | 2020-09-22 | Environment-friendly fracturing flow-back fluid wastewater profile control and flooding technology |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011005611.7A CN112093941A (en) | 2020-09-22 | 2020-09-22 | Environment-friendly fracturing flow-back fluid wastewater profile control and flooding technology |
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| CN112093941A true CN112093941A (en) | 2020-12-18 |
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| CN202011005611.7A Pending CN112093941A (en) | 2020-09-22 | 2020-09-22 | Environment-friendly fracturing flow-back fluid wastewater profile control and flooding technology |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114881230A (en) * | 2022-07-11 | 2022-08-09 | 成都创源油气技术开发有限公司 | Fracturing fluid flowback intelligent control system and equipment |
Citations (3)
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|---|---|---|---|---|
| CN104230037A (en) * | 2013-06-13 | 2014-12-24 | 扬州绿都环境工程设备有限公司 | Fracturing flowback liquid vehicular processing system |
| CN105347542A (en) * | 2015-10-29 | 2016-02-24 | 中国石油集团渤海钻探工程有限公司 | Guar gum fracturing flow-back fluid water treatment and reuse technology |
| WO2019024531A1 (en) * | 2017-07-31 | 2019-02-07 | 中国石油天然气股份有限公司 | Method for deep profile modification and flooding of low-permeability reservoir |
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2020
- 2020-09-22 CN CN202011005611.7A patent/CN112093941A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104230037A (en) * | 2013-06-13 | 2014-12-24 | 扬州绿都环境工程设备有限公司 | Fracturing flowback liquid vehicular processing system |
| CN105347542A (en) * | 2015-10-29 | 2016-02-24 | 中国石油集团渤海钻探工程有限公司 | Guar gum fracturing flow-back fluid water treatment and reuse technology |
| WO2019024531A1 (en) * | 2017-07-31 | 2019-02-07 | 中国石油天然气股份有限公司 | Method for deep profile modification and flooding of low-permeability reservoir |
Non-Patent Citations (1)
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114881230A (en) * | 2022-07-11 | 2022-08-09 | 成都创源油气技术开发有限公司 | Fracturing fluid flowback intelligent control system and equipment |
| CN114881230B (en) * | 2022-07-11 | 2022-11-04 | 成都创源油气技术开发有限公司 | Fracturing fluid flowback intelligent control system and equipment |
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