CN104891720A - Integrated treatment and recycle technology of shale gas development fracturing flow-back fluid system - Google Patents
Integrated treatment and recycle technology of shale gas development fracturing flow-back fluid system Download PDFInfo
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- CN104891720A CN104891720A CN201510238635.XA CN201510238635A CN104891720A CN 104891720 A CN104891720 A CN 104891720A CN 201510238635 A CN201510238635 A CN 201510238635A CN 104891720 A CN104891720 A CN 104891720A
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Abstract
The invention discloses an integrated treatment and recycling technology of a shale gas development fracturing flow-back fluid system. The integrated treatment and recycling technology comprises the following steps: performing electromagnetic separation treatment on a fracturing flow-back fluid; performing deep deoiling, hardness removal and solid-liquid separation treatment on the fracturing flow-back fluid through the electromagnetic separation treatment to obtain recycling water and water-containing sludge flocs; and performing dehydration treatment on the water-containing sludge flocs. The technology is simple in steps and good in controllability when the technology disclosed by the invention is used for treating the fracturing flow-back fluid, treatment agents do not need to be added, and complicated chemical treatment processes are also not needed; the activity of hydroxides generated by an electromagnetic separation system is higher than that in a medical method, the coagulation adsorption capacity is high, and the treatment effect is good. The system using the technology is high in integration degree, compact in structure and reasonable in layout, and equipment are respectively mounted in a container and are convenient to move and treat in well sites.
Description
Technical field
The present invention relates to chemical production technical field, be specifically related to a kind of shale gas development fracturing and return drainage system integrated approach reuse technology.
Background technology
Shale gas is a kind of novel energy resource, is the key areas that Oil And Gas Exploration And Development is new.Shale gas refers to that tax is stored in rich organic mud shale and interlayer thereof, and to adsorb or unbound state is the Unconventional forage of main existing way, composition, based on methane, is a kind of clean, Energy resources efficiently.Shale gas reservoir is different from conventional gas, has its unique distinction in reservoiring mechanism and bearing features, can only be extracted under given conditions.
Pressing crack construction operation is the major measure of shale gas well storey increase design, and after pressure break dosing water consumption causes greatly pressure break, raffinate returns discharge capacity greatly, and according to statistics, each drill crew every mouthful of fractured well every day produces 100 ~ 200m
3fracturing outlet liquid, containing a large amount of guanidine glue, formaldehyde, petroleum-type and other various additives in fracturing outlet liquid, and carrying the landwaste and loose propping agent that come off from stratum on a small quantity, the main contamination index of shale gas fracturing outlet liquid comprises the polymer such as friction reducer, sterilant, clay stabilizer, surfactivity cleanup additive, scale inhibitor contained in fracturing outlet liquid.On a large scale, for a long time pressing crack construction operation time liquid and stratum organic matter under bacterial growth and high pressure condition, polymer forms degraded in the earth formation, rupture after be present in liquid, density and the viscosity of liquid change.Meanwhile, stratum, under of the fracturing fluid effect, swelling clay mineral, comes off and migrates, and is dissolved into the metal ions such as a large amount of calcium, magnesium in fracturing liquid.
Large-scale waterfrac treatment is not only to the Freshwater resources build-up of pressure of China's shortage; if a large amount of backflow waste liquids produced after concurrent fracturing construction operation can not effectively recycle and pollution-free disposal; great pollution hidden trouble and environmental protection pressure will be caused to Oil/gas Well development area surrounding enviroment; if adopt the method for outward transport re-injection disposal by producing higher transportation cost, increase the risk of groundwater pollution simultaneously.
Developed country just carried out the systematic study to the process of oil-containing solid waste before more than 10 year, defined comparatively perfect relevant environmental regulation so far.Current China also begins one's study the process of oil-containing solid waste, and such as, fracturing outlet liquid waste liquid is carried out oil removal and reclaims the waste liquid after being recycled by CN103663877A patent application; Waste liquid degraded after reclaiming is obtained the waste liquid after degrading; Waste liquid flocculation after degraded also flotation obtains throw out; Throw out and liquid separation are obtained oil-gas field fracturing liquid preparation liquid.Patent CN101608543 is with broken glue, add flocculation agent, adhesive mud remover or sterilant and carry out sedimentation of suspension, sterilization, filtered and recycled, again filter through accurate filter essence, in filtered liquid, add biological enzyme formulation etc., solve the problem of environmental pollution of fracturing outlet liquid up hill and dale.After Du Guijun proposes and adopts flocculation, microwave Strong oxdiative, activated carbon felt process, nanofiltration/reverse osmosis integrated treatment process process to fracturing outlet liquid waste liquid in " oil field compression fracture returns discharge opeing treatment technology experimental study " literary composition of delivering of 2012 " oil-gas field environment protection " the 4th phase, the CODCr in fracturing outlet liquid can reach the requirement of GB 8978-1996 " integrated wastewater discharge standard " primary standard.
But the following problem of technique ubiquity of these process fracturing outlet liquids above-mentioned:
1) need with special biological agent, complex treatment process, technological process is wayward, is not suitable for field operation, and processing costs is high.
2) a large amount of medicament treating processess introduces new source of pollution, may produce other and pollutes or there is potential threat, increase resource recycling difficulty.
3) processing efficiency is low, can not meet the harmless treatment requirement in well site completely.
Summary of the invention
The object of this invention is to provide a kind of shale gas development fracturing and return drainage system integrated approach reuse technology, realize low cost, the innoxious governance to shale construction fracturing outlet liquid.
An embodiment provides a kind of shale gas development fracturing and return drainage system integrated approach reuse technology, comprise the following steps:
Electromagnetic separation process is carried out to fracturing outlet liquid;
Fracturing outlet liquid through electromagnetic separation process is carried out to degree of depth de-oiling, except hard and solid-liquid separation process, obtains reuse water and water-containing sludge flco;
Water-containing sludge flco is carried out processed.
Preferably, the step that fracturing outlet liquid carries out electromagnetic separation process is comprised:
Pumped into by fracturing outlet liquid in reactor, adjustment electric current is 0 ~ 200A, and voltage is 0 ~ 500V, and the electromagnetic treatment time is 25 ~ 60 min;
The pH value regulating the fracturing outlet liquid after electromagnetic treatment is 6 ~ 9;
Overflow in solarization air cell by the fracturing outlet liquid of adjust ph, be oxidized by part low valence metal ion, aeration time is 5 ~ 10 min.
Preferably, degree of depth de-oiling is carried out to the fracturing outlet liquid through electromagnetic separation process, except hard and solid-liquid separation process, the step obtaining reuse water and water-containing sludge flco comprises: return discharge opeing and join in carbon periosteum device by through splitting of Air Exposure and carry out degree of depth de-oiling, except hard and solid-liquid separation process.
Preferably, technique also comprises the step that the mud flco after by dehydration carries out harmless treatment.
Shale gas development fracturing provided by the invention returns discharge opeing treatment for reuse technique, has following beneficial effect:
1, use that the system integration degree of this technique is high, compact construction, rationally distributed, equipment is all installed in freight container, is convenient to move process in each well site.
2, processing step is simple, controllability good, without the need to adding treatment agent, does not also need complicated chemical treating process; The oxyhydroxide that electromagnetic separation system produces is higher than the activity of medical method, and cohesion high adsorption capacity, treatment effect is good.
3, this technique solid-liquid separation process will carry out being incorporated in a device except process sections such as hard, oil removing and solid-liquid separation process, and improve processing efficiency, equipment of having saved takes up an area space and energy consumption.
Therefore, this cover shale gas production drilling recovery processing process for fracturing return liquid can not only reach shale gas and specially mark " shale gas reservoir fracturing outlet liquid reclaims and treatment process " reuse water quality standard-required that committee sends out cloth, realizes fracturing outlet liquid and recycles; And whole system height is integrated, it is environment-friendly type treatment process.In addition, this treatment process is suitable for implementing in each place, has wide application space.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with the specific embodiment of the invention, technical solution of the present invention is clearly and completely described.
In one embodiment of the invention, shale gas development fracturing returns discharge opeing recovery process and can comprise the following steps:
1. pair fracturing outlet liquid carries out electromagnetic separation process;
Namely electrochemical principle is utilized, electrochemical reaction is produced by applying high voltage effect, be chemical energy electric energy conversion, in reactive tank, integrated oxidization and reduction reaction are carried out to the organic or inorganic pollution substance in fracturing outlet liquid waste water, and then cohesion, floating to remove, pollutent is separated from water body, effectively can removes the Cr in waste water
6+, Zn
2+, Ni
2+, Cu
2+, Cd
2+in heavy metal, various noxious pollutant such as CN, grease, phosphoric acid salt and COD, SS and colourity etc.Electromagnetic separation process can remove more than 95% suspended substance in waste water, more than 90% heavy metal, more than 60% COD, more than 60% oil in water emulsion, the bacterium class of more than 95%.
In one embodiment of the invention, can also comprise the following steps the step that fracturing outlet liquid carries out electromagnetic separation process:
Pumped into by fracturing outlet liquid in reactor, adjustment electric current is 0 ~ 200A, and voltage is 0 ~ 500V, and the electromagnetic treatment time is 25 ~ 60 min;
The pH value regulating the fracturing outlet liquid after electromagnetic treatment is 6 ~ 9;
In one embodiment of the invention, pipeline doser can be adopted to add the basic mineral reagents of minute quantity, adding of inorganic reagent can not affect follow-up reuse water configuration fracturing outlet liquid, and alkaline reagents can be NaOH, CaO, Ca (OH)
2, NaCO
3, NaHCO
3in one.
Overflow in solarization air cell by the fracturing outlet liquid of adjust ph, be oxidized by part low valence metal ion, for fully flowing and oxidation in waste liquid, low valence metal ion and oxidation operation are separated out, and aeration time can be 5 ~ 10 min.
In specific embodiment of the invention process, can according to different water quality situations, the suitably above processing parameter of adjustment.
2. the fracturing outlet liquid pair through electromagnetic separation process carries out degree of depth de-oiling, except hard and solid-liquid separation process, obtains reuse water and water-containing sludge flco; The oil length <5 mg/L of the reuse water obtained, can directly as the of the fracturing fluid reuse water of configuration.
In one embodiment of the invention, degree of depth de-oiling is carried out to fracturing outlet liquid, except device that is hard and solid-liquid separation process can be made up of the carbon periosteum of many series connection, fracturing outlet liquid waste liquid directly enters carbon periosteum device.Due to special hydrophilic oleophobic performance, carbon periosteum can synchronously carry out de-oiling and go suspended substance process.Oil content and solid can be removed by the pressure and flow that regulate carbon periosteum simultaneously, therefore, not need during solid-liquid separation process to add any flocculation agent and utility appliance.
In one embodiment of the invention, carbon periosteum pressure used is 0.3 ~ 1 MPa, and backwash pressure is 0.6 ~ 1.5 MPa, and the backwash time is 5 ~ 10 min.
In one embodiment of the invention, reuse water directly enters product water pot; The dense water that solid-liquid separation produces enters dewatering system, the water ratio >90% of dense water, and the rate of recovery of carbon periosteum system is 85 ~ 95%.
3. water-containing sludge flco is carried out processed.
In one embodiment of the invention, water-containing sludge flco is carried out processed and comprise two steps, the first step makes water-containing sludge flco by single tape gravity sludge condensation district, and second step water-containing sludge flco is by biobelt press filtration sludge dewatering district, and the catch rate of solid particulate can reach 80 ~ 95%.When dewatering to the mud of waste liquid of drilling and fracturing fluid, the mud solid content after dehydration can reach 30 ~ 40% dry weights.
In one embodiment of the invention, the mud after dehydration, according to " Sichuan Gas Fields drilling wastes harmlessness disposing technical specifications " (Q/SY XN 0276-2007) related request, carries out innoxious landfill disposal.Intensity and the leach liquor of landfill body all meet the relevant regulations of " general industrial solid waste storage, disposal site Environmental capacity standard " (GB18599-2001), " Sichuan Gas Fields drilling wastes harmlessness disposing technical specifications " (Q/SY XN 0276-2007), " integrated wastewater discharge standard " (GB 8978-1996) primary standard.
Although with above-mentioned preferred embodiment to invention has been detailed description, not limit the present invention with above-described embodiment.Those skilled in the art should recognize when the technical characteristic do not departed from given by technical solution of the present invention and scope, the increase done technical characteristic, with the replacement of some same contents of this area, all should belong to protection scope of the present invention.
Claims (4)
1. shale gas development fracturing returns a drainage system integrated approach reuse technology, it is characterized in that, comprising:
Electromagnetic separation process is carried out to described fracturing outlet liquid;
The described fracturing outlet liquid through electromagnetic separation process is carried out to degree of depth de-oiling, except hard and solid-liquid separation process, obtains reuse water and water-containing sludge flco;
Described water-containing sludge flco is carried out processed.
2. technique according to claim 1, is characterized in that, the step of described electromagnetic separation process comprises:
Pumped into by fracturing outlet liquid in reactor, adjustment electric current is 0 ~ 200A, and voltage is 0 ~ 500V, and the electromagnetic treatment time is 25 ~ 60 min;
The pH value of the fracturing outlet liquid after described electromagnetic treatment is regulated to be 6 ~ 9;
Overflow in solarization air cell by the fracturing outlet liquid of described adjust ph, be oxidized by part low valence metal ion, aeration time is 5 ~ 10 min.
3. technique according to claim 2, is characterized in that, describedly carries out degree of depth de-oiling to the fracturing outlet liquid through electromagnetic separation process, except hard and solid-liquid separation process, the step obtaining reuse water and water-containing sludge flco comprises:
Return discharge opeing by described and join in carbon periosteum device through splitting of Air Exposure and carry out degree of depth de-oiling, except hard and solid-liquid separation process.
4. technique according to claim 1, is characterized in that, also comprises:
Mud flco after described dehydration is carried out harmless treatment.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105859070A (en) * | 2016-04-27 | 2016-08-17 | 刘波 | Odorless sludge advanced treatment method and system thereof |
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Address after: 610056 Sichuan Province, Chengdu City, bay 66 Applicant after: CHENGDU EN-SHAIN TECHNOLOGY INCORPORATION Applicant after: Sichuan Rongrui Huabao Technology Co.,Ltd. Address before: 610056 Sichuan Province, Chengdu City, bay 66 Applicant before: Chengdu En-Shine Oil & Gas Co., Ltd. Applicant before: Sichuan Rongrui Huabao Technology Co.,Ltd. |
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Application publication date: 20150909 |