CN107445258B - Electrochemical adsorption treatment device and process for water-based waste drilling fluid - Google Patents
Electrochemical adsorption treatment device and process for water-based waste drilling fluid Download PDFInfo
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- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4691—Capacitive deionisation
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- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
- C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/46—Apparatus for electrochemical processes
- C02F2201/461—Electrolysis apparatus
- C02F2201/46105—Details relating to the electrolytic devices
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/46—Apparatus for electrochemical processes
- C02F2201/461—Electrolysis apparatus
- C02F2201/46105—Details relating to the electrolytic devices
- C02F2201/4612—Controlling or monitoring
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/46—Apparatus for electrochemical processes
- C02F2201/461—Electrolysis apparatus
- C02F2201/46105—Details relating to the electrolytic devices
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/46—Apparatus for electrochemical processes
- C02F2201/461—Electrolysis apparatus
- C02F2201/46105—Details relating to the electrolytic devices
- C02F2201/4612—Controlling or monitoring
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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
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/46—Apparatus for electrochemical processes
- C02F2201/461—Electrolysis apparatus
- C02F2201/46105—Details relating to the electrolytic devices
- C02F2201/4618—Supplying or removing reactants or electrolyte
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Abstract
The invention provides an electrochemical adsorption treatment device and process for water-based waste drilling fluid. The electrochemical adsorption treatment device for the water-based waste drilling fluid comprises a mud tank, a mud pump, a flowmeter, an electrolytic bath, an electrode and an automatic control system; the mud tank is circularly communicated with a mud pump; the mud pump is communicated with the flowmeter; the mud tank is communicated with the flowmeter; the flowmeter is communicated with the electrolytic cell; the electrodes comprise an anode and a cathode, and the electrodes are arranged in the electrolytic bath; the automatic control system is electrically connected with the electrode and the flowmeter. The electrochemical adsorption treatment device and the process thereof for the water-based waste drilling fluid provided by the invention do not add a chemical treatment agent, do not damage effective components in the drilling fluid, and can effectively remove poor solid phases such as ultrafine particles in the drilling waste fluid, so that the main performance indexes such as density, sand content and solid content of the drilling waste fluid are reduced, the rheological property of the drilling waste fluid is improved, and the performance index requirement of the water-based drilling fluid recycling is met.
Description
Technical Field
The invention belongs to the technical field of oil and gas field drilling in the petroleum industry, and relates to an electrochemical adsorption treatment device and process for water-based waste drilling fluid.
Background
A large amount of water-based drilling wastes (waste drilling fluid and drill cuttings) are generated in the process of oil-gas exploration, development and drilling operation, the existing water-based drilling waste treatment mode mainly adopts the mode of curing and burying and natural evaporation at a well site, a small amount of water-based drilling wastes are recycled, the resource rate is low (about 1.5 percent), and the environmental risk is high. The existing disposal mode is simple, if the disposal mode is improper, the hidden danger of pollution of soil and underground water is easily caused, and the legal risk that the pollutants are treated by adopting a 'pit seepage and perfusion' mode, which is considered by the environmental protection department of government, exists. With the implementation of new environmental protection methods, the traditional curing and landfill treatment methods are strictly prohibited gradually. If the water-based drilling waste generated in exploration and development cannot be effectively treated and disposed in time, legal sanctions and large fine are faced. The research and development of the water-based drilling waste liquid recycling technology and device can improve the recycling utilization rate and the resource utilization rate of the water-based drilling waste, and is an urgent need for meeting the increasingly strict new environmental protection requirements of the state, upgrading the drilling waste treatment technology and improving the drilling environmental risk prevention and control capability of oil field enterprises.
Disclosure of Invention
In order to improve the cyclic utilization rate and the resource rate of water-based drilling waste, promote the change of the exploration and development modes of oil and gas fields and provide a powerful environment-friendly technology and equipment support for the green development of the oil and gas fields, the invention aims to provide a novel regeneration electric adsorption technology for waste drilling fluid.
The purpose of the invention is realized by the following technical scheme:
in one aspect, the invention provides a water-based waste drilling fluid electrochemical adsorption treatment device, which comprises a mud tank, a mud pump, a flowmeter, an electrolytic bath, electrodes and an automatic control system;
the mud tank is circularly communicated with the mud pump; the mud pump is communicated with the flowmeter; the mud tank is communicated with the flowmeter; the flowmeter is communicated with the electrolytic bath; the electrodes comprise an anode and a cathode, and the electrodes are arranged in the electrolytic bath; the automatic control system is electrically connected with the electrode, and the automatic control system is electrically connected with the flowmeter.
In the electrochemical adsorption treatment device for the water-based waste drilling fluid, the automatic control system is a computer capable of carrying out automatic operation, a human-computer interface touch screen is adopted, and data of control points including the flow rate of cement slurry entering, current, voltage and mud scraping time interval are displayed on the human-computer interface; the current level, mud interval, device on and off are all adjusted on the human-machine interface.
In the above electrochemical adsorption treatment device for water-based waste drilling fluid, preferably, the electrochemical adsorption treatment device for water-based waste drilling fluid further comprises a mud tank, and the mud tank is communicated with the electrolytic tank.
In the above electrochemical adsorption treatment device for water-based waste drilling fluid, preferably, the electrochemical adsorption treatment device for water-based waste drilling fluid further comprises a sludge tank, and the sludge tank is communicated with the electrolysis tank.
In the above electrochemical adsorption treatment device for water-based waste drilling fluid, preferably, the electrochemical adsorption treatment device for water-based waste drilling fluid further comprises a scraping blade, the scraping blade is arranged in the electrolytic cell and is electrically connected with the automatic control system, and the scraping blade is used for scraping solid particles deposited on the anode of the electrode.
In the electrochemical adsorption treatment device for water-based waste drilling fluid, the electrode is preferably a carbon-based composite material and is purchased from Wuhan Wenmeng environmental protection technology Co. The electrode is matched with a positive electrode and a negative electrode, a drilling mud solution contains a large amount of anionic surfactant, wherein the anode is used for the principles of electrochemical adsorption and electrooxidation polymerization, and a large amount of fine particles are carried in the adsorption process and deposited on the anode (the particle size of the particles is less than or equal to 2 mu m, and the particles cannot be separated and removed by a high-speed centrifuge), so that the viscosity of the mud is reduced, the proper specific gravity is achieved, and the production requirement of the next procedure is met. The composite electrode is compounded by special materials, and the anode of the composite electrode has strong adsorption/polymerization capacity, so that the components of a slurry system are not greatly changed.
In the above electrochemical adsorption treatment device for water-based waste drilling fluid, preferably, at least one valve is further disposed on a pipeline connecting the mud pump and the flow meter.
In the above electrochemical adsorption treatment device for water-based waste drilling fluid, preferably, at least one valve is further disposed on a pipeline where the mud pump is in circulation communication with the mud tank.
On the other hand, the invention also provides an electrochemical adsorption treatment process for the water-based waste drilling fluid, which is carried out by adopting the electrochemical adsorption treatment device for the water-based waste drilling fluid and comprises the following steps:
pumping the centrifugally treated drilling fluid into an electrolytic tank from a slurry tank by using a slurry pump, and regulating a flow meter by using an automatic control system to control the flow of the drilling fluid;
then the electrode is controlled by an automatic control system to carry out electrochemical adsorption, solid particles deposited on the anode of the electrode are scraped by a scraper and discharged out of the electrolytic bath;
and collecting the drilling fluid subjected to the electro-adsorption treatment and the scraped poor solid phase.
In the electrochemical adsorption treatment process of the water-based waste drilling fluid, the flow rate of the drilling fluid is preferably controlled to be 20-25L/h by adjusting the flow meter through an automatic control system.
In the electrochemical adsorption treatment process of the water-based waste drilling fluid, preferably, the electrode is controlled by an automatic control system to carry out electrochemical adsorption, the electric adsorption current is 2-12A, and the electric adsorption voltage is 10-30V. The electrode has the strongest adsorption force on the drilling fluid by adopting the current and the voltage provided by the invention.
In the electrochemical adsorption treatment process of the water-based waste drilling fluid, preferably, during electrochemical adsorption, the scraper is controlled by an automatic control system to scrape solid particles deposited on the anode of the electrode every 5-10 min. The interval between the scraping blades is 5-10 minutes, which is the optimal interval time, and the adhesion thickness of solid-phase particles on the polar plate is increased along with the increase of the adsorption time, but the increase of the thickness is gradually reduced.
The electrochemical adsorption treatment device and the process thereof mainly aim at harmful solid phases and ultrafine particles with the particle size less than or equal to 2 mu m, remove the inferior solid phases in the waste drilling fluid under the conditions of not adding chemical treatment agents and reducing and not damaging effective components in the drilling fluid to the minimum extent, improve the performance of the regenerated drilling fluid, and have remarkable advantages. The method is favorable for improving the cyclic utilization rate and the resource rate of the water-based drilling waste, promoting the change of the exploration and development mode of the oil and gas field and providing powerful environment-friendly technology and equipment support for the green development of the oil and gas field.
The electrochemical adsorption treatment device and the process for the water-based waste drilling fluid have the following advantages:
(1) the method realizes the reclamation of the waste, improves the recycling performance of the slurry, reaches the index of the recycling performance of the slurry and reduces the disposal quantity of the waste slurry.
(2) The drilling fluid additive is not added with a chemical treatment agent, has little damage to the active ingredients of the original filtrate reducer, lubricant, inhibitor and the like in the drilling fluid, and can effectively remove the poor solid phase such as ultrafine particles and the like in the drilling waste liquid, thereby reducing the main performance indexes such as the density, the sand content, the solid content and the like of the drilling waste liquid, improving the rheological property of the drilling waste liquid and meeting the performance index requirement of the water-based drilling fluid recycling.
(3) The drilling expense is saved, the treated mud can be directly reused for drilling in a drilling team, and the drilling mud cost is saved.
(4) The method saves land and treatment cost, drilling well field of drilling wastes does not need or reduce digging of a landfill pool after the waste mud is subjected to regeneration treatment, saves land, and saves the cost of harmless treatment of the waste mud, digging of the landfill pool, seepage prevention and the like.
Drawings
FIG. 1 is a schematic diagram of an electrochemical adsorption treatment device for water-based waste drilling fluid in example 1 of the present invention;
description of the symbols of the drawings:
1 mud tank, 2 mud pumps, 3 flow meters, 4 electrolysis baths, 5 electrodes, 6 automatic control systems, 7 mud baths, 8 mud baths, 9 valves and 10 valves.
Detailed Description
The technical solutions of the present invention will be described in detail below in order to clearly understand the technical features, objects, and advantages of the present invention, but the present invention is not limited to the practical scope of the present invention.
The drilling fluid adopted in the following embodiment of the invention is collected from water-based drilling fluid (three-throw polysulfonate) separated by a solid control vibrating screen of a certain well of a certain oil-gas field, the water-based drilling fluid is subjected to centrifugal treatment, 50L of water-based drilling fluid is sampled and subjected to centrifugal treatment by a centrifugal machine, the centrifugal rotating speed is 2000rpm, and the centrifugal time is 5 min. The properties of the slurry after centrifugation are shown in Table 1.
TABLE 1
As can be seen from Table 1, the polysulfonate water-based drilling fluid has improved performance indexes after being treated by a centrifuge, but part of the performance indexes still can not meet the use requirements of the drilling fluid in the well section. Therefore, the centrifuged polysulfonate drilling fluid is subjected to electrochemical adsorption treatment by using the electrochemical adsorption treatment device and the electrochemical adsorption treatment process for the water-based waste drilling fluid provided in the following embodiments.
Example 1
The embodiment provides an electrochemical adsorption treatment device for water-based waste drilling fluid, which comprises a mud tank 1, a mud pump 2, a flow meter 3, an electrolytic tank 4, an electrode 5, an automatic control system 6, a mud tank 7, a mud tank 8, a valve 9 and a valve 10, as shown in fig. 1;
the mud tank 1 is circularly communicated with the mud pump 2, and a valve 10 is arranged on a pipeline communicated with the mud tank; the mud pump 2 is communicated with the flowmeter 3, and a valve 9 is arranged on a pipeline communicated with the mud pump; the mud tank 1 is communicated with the flowmeter 3, and the communicated pipeline is sequentially provided with the valve 10 and the valve 9; the flowmeter 3 is communicated with the electrolytic bath 4; the electrodes 5 comprise an anode and a cathode, and the electrodes 5 are arranged in the electrolytic bath 4; the automatic control system 6 is electrically connected with the electrode 5, and the automatic control system 6 is electrically connected with the flowmeter 3; the mud tank 8 is communicated with the electrolytic tank 4; the sludge tank 7 is communicated with the electrolytic tank 4. The electrochemical adsorption treatment device for the water-based waste drilling fluid further comprises a scraping blade which is arranged in the electrolytic bath 4 and is electrically connected with an automatic control system 6 (not shown in figure 1), and the scraping blade is used for scraping solid particles deposited on the electrode 5.
The inner walls of the mud tank 1, the mud tank 8 and the electrolytic bath 4 are made of organic glass materials, the shell is made of 316L stainless steel materials, pipelines and scraping pieces communicated with each component are made of PP materials, and the valve is made of engineering plastics. The electrode 5 is a carbon-based composite material, and is purchased from Wuhan Wermon environmental protection technologies, Inc.
Example 2
The embodiment provides an electrochemical adsorption treatment process for water-based waste drilling fluid, which is performed by using the electrochemical adsorption treatment device for water-based waste drilling fluid provided in embodiment 1, and the electrochemical adsorption treatment process comprises the following steps:
and pumping the drilling fluid (the parameters of which are shown in the table 1) subjected to centrifugal treatment into an electrolytic bath from a mud tank 1 by using a mud pump 2, adjusting a flow meter 3 by using an automatic control system 6 to control the flow rate of the drilling fluid to be 20L/h, and opening a valve 10 when the flow rate of the drilling fluid is more than 20L/h, so that part of the drilling fluid flows back into the mud tank 1.
Then, controlling the electrode to carry out electrochemical adsorption through an automatic control system, regulating the voltage to be 10V, outputting the current to be 2A, controlling a scraping blade through the automatic control system to scrape solid particles deposited on the electrode every 5min, and discharging the solid particles out of the electrolytic bath;
and collecting the drilling fluid subjected to the electro-adsorption treatment and the scraped poor solid phase. And (4) evaluating the performance of the regenerated slurry. The evaluation results are shown in table 2.
TABLE 2
As can be seen from Table 2, the conventional performance indexes and rheological parameters of the water-based drilling fluid after electrochemical adsorption treatment can meet the requirements of drilling fluid recycling.
Example 3
The embodiment provides an electrochemical adsorption treatment process for water-based waste drilling fluid, which is performed by using the electrochemical adsorption treatment device for water-based waste drilling fluid provided in embodiment 1, and the electrochemical adsorption treatment process comprises the following steps:
and pumping the drilling fluid (the parameters of which are shown in the table 1) subjected to centrifugal treatment into an electrolytic bath from a mud tank 1 by using a mud pump 2, adjusting a flow meter 3 by using an automatic control system 6 to control the flow rate of the drilling fluid to be 20L/h, and opening a valve 10 when the flow rate of the drilling fluid is more than 20L/h, so that part of the drilling fluid flows back into the mud tank 1.
Then, controlling the electrode to carry out electrochemical adsorption through an automatic control system, regulating the voltage to be 15V, outputting the current to be 4A, controlling a scraping blade through the automatic control system to scrape solid particles deposited on the anode of the electrode every 5min, and discharging the solid particles out of the electrolytic cell;
and collecting the drilling fluid subjected to the electro-adsorption treatment and the scraped poor solid phase. And (4) evaluating the performance of the regenerated slurry. The evaluation results are shown in table 3.
TABLE 3
As can be seen from Table 3, the conventional performance indexes and rheological parameters of the water-based drilling fluid after electrochemical adsorption treatment can meet the requirements of drilling fluid recycling.
Example 4
The embodiment provides an electrochemical adsorption treatment process for water-based waste drilling fluid, which is performed by using the electrochemical adsorption treatment device for water-based waste drilling fluid provided in embodiment 1, and the electrochemical adsorption treatment process comprises the following steps:
and pumping the drilling fluid (the parameters of which are shown in the table 1) subjected to centrifugal treatment into an electrolytic bath from a mud tank 1 by using a mud pump 2, adjusting a flow meter 3 by using an automatic control system 6 to control the flow rate of the drilling fluid to be 20L/h, and opening a valve 10 when the flow rate of the drilling fluid is more than 20L/h, so that part of the drilling fluid flows back into the mud tank 1.
Then, the electrode is controlled by an automatic control system 6 to carry out electrochemical adsorption, the voltage is regulated to be 30V, the output current is 2A, the scraper is controlled by the automatic control system 6 to scrape solid particles deposited on the anode of the electrode every 10min, and the solid particles are discharged out of the electrolytic bath;
and collecting the drilling fluid subjected to the electro-adsorption treatment and the scraped poor solid phase. And (4) evaluating the performance of the regenerated slurry. The evaluation results are shown in Table 4.
TABLE 4
As can be seen from Table 4, the conventional performance indexes and rheological parameters of the water-based drilling fluid after electrochemical adsorption treatment can meet the requirements of drilling fluid recycling.
The evaluation results shown in tables 2 to 4 show that the electrochemical adsorption treatment does not add a chemical treatment agent, does not destroy the effective components in the drilling fluid, and can effectively remove the poor solid phase such as ultrafine particles in the drilling waste liquid, so that the main performance indexes such as the density, the sand content and the solid content of the drilling waste liquid are reduced, the rheological property of the drilling waste liquid is improved, and the performance index requirements of the water-based drilling fluid recycling are met. By investigating the performance evaluation of the electrochemical adsorption treatment of the water-based drilling waste liquid, a set of electrochemical adsorption treatment device for the water-based waste drilling fluid and a process method for the advanced treatment of the water-based drilling fluid can be formed.
Claims (6)
1. An electrochemical adsorption treatment process for water-based waste drilling fluid is carried out by adopting an electrochemical adsorption treatment device for the water-based waste drilling fluid, and comprises the following steps:
pumping the centrifugally treated drilling fluid into an electrolytic tank from a slurry tank by using a slurry pump, and regulating a flow meter by using an automatic control system to control the flow of the drilling fluid;
then the electrode is controlled by an automatic control system to carry out electrochemical adsorption, solid particles deposited on the anode of the electrode are scraped by a scraper and discharged out of the electrolytic bath;
collecting the drilling fluid after the electro-adsorption treatment and the scraped poor solid phase;
the electrochemical adsorption treatment device for the water-based waste drilling fluid comprises a mud tank, a mud pump, a flowmeter, an electrolytic bath, an electrode and an automatic control system;
the mud tank is circularly communicated with the mud pump; the mud pump is communicated with the flowmeter; the mud tank is communicated with the flowmeter; the flowmeter is communicated with the electrolytic bath; the electrodes comprise an anode and a cathode, and the electrodes are arranged in the electrolytic bath; the automatic control system is electrically connected with the electrode and the flowmeter;
the electrochemical adsorption treatment device for the water-based waste drilling fluid further comprises a scraping blade, the scraping blade is arranged in the electrolytic bath and is electrically connected with the automatic control system, and the scraping blade is used for scraping solid particles deposited on the electrode anode;
the electrode is made of carbon-based composite material;
the electro-adsorption current for electro-chemical adsorption of the electrode is controlled to be 2-12A by an automatic control system, and the electro-adsorption voltage is 10-30V;
and when the electrochemical adsorption is carried out, the scraping blade is controlled by an automatic control system to scrape solid particles deposited on the anode of the electrode every 5-10 min.
2. The electrochemical adsorption treatment process of the water-based waste drilling fluid according to claim 1, wherein the electrochemical adsorption treatment process comprises the following steps: the flow rate of the drilling fluid is controlled to be 20-25L/h by adjusting the flow meter through an automatic control system.
3. The electrochemical adsorption treatment process of the water-based waste drilling fluid according to claim 1, wherein the electrochemical adsorption treatment process comprises the following steps: the electrochemical adsorption treatment device for the water-based waste drilling fluid further comprises a mud tank, and the mud tank is communicated with the electrolytic tank.
4. The electrochemical adsorption treatment process of the water-based waste drilling fluid according to claim 1, wherein the electrochemical adsorption treatment process comprises the following steps: the electrochemical adsorption treatment device for the water-based waste drilling fluid also comprises a sludge tank, wherein the sludge tank is communicated with the electrolytic tank.
5. The electrochemical adsorption treatment process of the water-based waste drilling fluid according to claim 1, wherein the electrochemical adsorption treatment process comprises the following steps: and at least one valve is also arranged on a pipeline for communicating the mud pump with the flowmeter.
6. The electrochemical adsorption treatment process of the water-based waste drilling fluid according to claim 1, wherein the electrochemical adsorption treatment process comprises the following steps: and at least one valve is also arranged on a pipeline for circularly communicating the mud pump and the mud tank.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1590308A (en) * | 2003-09-04 | 2005-03-09 | 三洋电机株式会社 | Water treater |
| CN101962232A (en) * | 2010-10-26 | 2011-02-02 | 中国科学院南京地理与湖泊研究所 | Sediment microorganism electrochemical device and application thereof |
| CN202430076U (en) * | 2012-01-04 | 2012-09-12 | 成都泰瑞美科技有限公司 | High-frequency impulse full-automatic treatment device for petroleum drilling sewage |
| CN103958827A (en) * | 2011-09-30 | 2014-07-30 | M-I有限公司 | Drilling fluid processing |
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| KR20120132949A (en) * | 2011-05-30 | 2012-12-10 | 대우조선해양 주식회사 | Marine growth protection device for ship |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1590308A (en) * | 2003-09-04 | 2005-03-09 | 三洋电机株式会社 | Water treater |
| CN101962232A (en) * | 2010-10-26 | 2011-02-02 | 中国科学院南京地理与湖泊研究所 | Sediment microorganism electrochemical device and application thereof |
| CN103958827A (en) * | 2011-09-30 | 2014-07-30 | M-I有限公司 | Drilling fluid processing |
| CN202430076U (en) * | 2012-01-04 | 2012-09-12 | 成都泰瑞美科技有限公司 | High-frequency impulse full-automatic treatment device for petroleum drilling sewage |
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