CN110845038A - Dewatering method for waste water-based drilling fluid - Google Patents
Dewatering method for waste water-based drilling fluid Download PDFInfo
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- CN110845038A CN110845038A CN201911080684.XA CN201911080684A CN110845038A CN 110845038 A CN110845038 A CN 110845038A CN 201911080684 A CN201911080684 A CN 201911080684A CN 110845038 A CN110845038 A CN 110845038A
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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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- 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
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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
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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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
- 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
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Processing Of Solid Wastes (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a dewatering method of waste water-based drilling fluid, which comprises the following steps of firstly, collecting the waste drilling fluid; secondly, homogenizing a mixed phase, improving the performance parameters of the waste drilling fluid by adjusting the pH value of the waste drilling fluid, increasing the electrolyte content and improving the liquid thixotropy, and preliminarily separating solid and liquid in the drilling waste fluid after the performance parameters are improved; thirdly, breaking gel and destabilizing, namely adding electrolyte into the mixed liquid aiming at the mixed liquid after mixed phase homogenization, destroying the stability of a gel system in the mixed liquid after mixed phase homogenization and condensing and aggregating suspended particle substances into large particle substances; fourthly, performing secondary solid-liquid separation, and removing water in an unstable multiphase mixture of the waste drilling fluid after gel breaking and destabilization by means of physical filtration to achieve the effect of solid-phase and liquid-phase separation; and fifthly, storing the waste water and the solid waste. Through the processes of miscible phase homogenization and gel breaking destabilization, the waste drilling fluid gel system is gathered into large-particle substances.
Description
Technical Field
The invention belongs to the technical field of low-permeability oilfield development, and particularly relates to a dehydration method for waste water-based drilling fluid.
Background
The waste water-based drilling fluid is a product in a drilling process, mainly comprises complex multiphase stable colloids consisting of water, clay, drill cuttings, a flocculating agent, a drilling fluid additive and the like, and also comprises deep underground water, drill cuttings, clay and the like mixed in a stratum during drilling besides bentonite, a weighting agent, inorganic salts, inorganic polymers, organic matters, synthetic polymers, a surfactant and the like added in the drilling fluid and used for improving the performance of the drilling fluid, wherein the pH value is alkaline, generally ranges from 8.15 to 9.10, sometimes even reaches more than 9, the water content is generally between 35% and 90%, and the particle size of solid phase particles is generally between 0.01 mu m2 and 0.1 mu m2 (namely more than 95% of particles pass through a 200-mesh sieve).
In the drilling process, a mud pit is usually adopted for solid-liquid separation, after the natural sedimentation of the particulate matters in the waste drilling fluid, the liquid at the upper part of the mud pit is pumped out for recycling, and the solid-phase matters at the bottom are treated and buried along with the mud pit. However, the content of suspended matters in the liquid naturally precipitated in the mud pit is more than 120-300mg/L, so that the solid-liquid separation efficiency is low and the water quality difference after separation is large. In addition, a large tank is adopted to collect the waste water-based drilling fluid, and solid-liquid separation is carried out after step-by-step natural precipitation, so that the solid-liquid separation efficiency is not substantially improved although a mud pit is replaced.
Disclosure of Invention
The invention aims to provide a dehydration method of waste water-based drilling fluid with lower solid content for wastewater dehydration.
The invention aims to realize the dehydration method of the waste water-based drilling fluid by the following technical means, and the method comprises the following specific steps
Firstly, collecting waste drilling fluid, and collecting the waste drilling fluid from all sewage outlets of drilling solid control equipment;
secondly, homogenizing the mixed phase, and improving the performance parameters of the waste drilling fluid by adding shower liquid, so that the solid content of the waste drilling fluid is lower than 20%, the conductivity is 75-95ms/cm, and the specific resistance of sludge is lower than 35 multiplied by 109S2The electric area of the liquid is-30 mV to-20 mV, and the solid and the liquid in the drilling waste liquid are preliminarily separated after the performance parameters are improved; the spraying liquid is prepared by mixing water, hydrochloric acid solution with volume concentration of 10% and calcium chloride solution with volume concentration of 30% according to the volume ratio of 1:0.3: 0.5.
Thirdly, breaking gel and destabilizing, namely adding a polyaluminium chloride solution into the mixed liquid and then stirring the mixed liquid, and then adding a poly dimethyl diallyl ammonium chloride solution into the mixed liquid and stirring the mixed liquid again to destroy the stability of a gel system in the mixed liquid after mixed phase homogenization and condense and aggregate suspended particle substances into large particle substances with the particle size of more than 10 microns;
fourthly, performing secondary solid-liquid separation, and removing water in an unstable multiphase mixture of the waste drilling fluid after gel breaking and destabilization by means of physical filtration to achieve the effect of solid-phase and liquid-phase separation;
and fifthly, storing the waste water and the solid waste, and respectively storing the separated liquid and the solid waste in a storage tank for subsequent treatment.
The concrete method of the mixed phase homogenization in the second step is that the waste drilling fluid is conveyed to a plurality of sections of vibration separation sieves connected in series through a crawler-type conveyor belt, fog-like spray liquid is sprayed onto the conveyor belt and the separation sieves through spray heads in the conveying process, liquid separated by the vibration separation sieves enters the third step after being homogenized and stirred, and separated solids are collected.
During spraying, 1 volume of the waste rotary drilling fluid is sprayed with 0.5-1.5 volumes of spraying fluid.
The homogenizing stirring intensity is not lower than 180 r/min, and the hydraulic retention time is 10 min.
The third step of gel breaking and destabilization is specifically that 0.01 to 0.05 volume of polyaluminium chloride solution with volume concentration of 3 percent is added into the mixed liquid, the stirring intensity is not lower than 180 r/min, and the stirring is continued for 5 min; then adding 0.01-0.03 volume of solution with the volume concentration of 0.5% of poly dimethyl diallyl ammonium chloride, wherein the stirring intensity is not lower than 30 r/min, and the hydraulic retention time is 15 min.
And in the fourth step, performing filter pressing on the liquid obtained after the third step by adopting a filter pressing technology, and respectively storing the liquid and the solid waste after filter pressing separation in a storage tank for subsequent treatment.
The invention has the beneficial effects that: 1. the property of the waste liquid is improved by the spraying liquid, and preliminary solid-liquid separation is realized. Meanwhile, electrolyte is used for destroying the stability of a gel system in the mixed liquid after mixed phase homogenization, suspended particle substances are coagulated and aggregated into large particle substances, suspended substances in the waste liquid are further discharged, the water removal amount is 5-8 times of the liquid amount of the naturally precipitated solid-liquid separation liquid in a mud pit, and the content of the suspended substances in the treated water is lower than 30 mg/L.
2. The solid phase content in the dehydrated waste water is lower than 6 percent, the pH value is 6-8, the method can be repeatedly applied to the whole dehydration treatment process, the water content of the dehydrated solid slag is controlled to be 60-70 percent, and the dehydrated solid slag can be used as a material for paving roads or pressing certain building materials.
Detailed Description
[ example 1 ]
A dehydration method of waste water-based drilling fluid comprises the following specific steps
Firstly, collecting waste drilling fluid, and collecting the waste drilling fluid from all sewage outlets of drilling solid control equipment;
secondly, homogenizing the mixed phase, and improving the performance parameters of the waste drilling fluid by adding shower liquid, so that the solid content of the waste drilling fluid is lower than 20%, the conductivity is 75-95ms/cm, and the specific resistance of sludge is lower than 35 multiplied by 109S2The electric area of the liquid is-30 mV to-20 mV, and the solid and the liquid in the drilling waste liquid are preliminarily separated after the performance parameters are improved; the spraying liquid is prepared by mixing water, hydrochloric acid solution with volume concentration of 10% and calcium chloride solution with volume concentration of 30% according to the volume ratio of 1:0.3: 0.5. The pH value of the waste drilling fluid is adjusted and the electrolyte is added by adding shower liquidThe content and the thixotropy of liquid are improved, the performance parameters of the waste drilling fluid are improved, part of suspended matters are precipitated, the preliminary solid-liquid separation is completed, and finally the solid content of the treated waste drilling fluid is lower than 20 percent, the conductivity is between 75 and 95ms/cm, and the specific resistance of sludge is lower than 35 multiplied by 109S2The electric area of the liquid is-30 mV to-20 mV/g.
Thirdly, breaking gel and destabilizing, namely adding a polyaluminium chloride solution into the mixed liquid and then stirring the mixed liquid, and then adding a poly dimethyl diallyl ammonium chloride solution into the mixed liquid and stirring the mixed liquid again to destroy the stability of a gel system in the mixed liquid after mixed phase homogenization and condense and aggregate suspended particle substances into large particle substances with the particle size of more than 10 microns; for the waste liquid separated in the second step, electrolytes, namely polyaluminum chloride solution and poly dimethyl diallyl ammonium chloride solution are used for destroying the stability of a gel system in the mixed liquid after the mixed phase homogenization, and suspended particle substances are coagulated and aggregated into large-particle substances; the stability of the mixed liquid after the mixed phase homogenization is destroyed, the electronegativity of the mixed liquid is improved, and bound water in the waste drilling fluid is released. Further separating the solid in the waste liquid to ensure that the solid content in the removed waste water is lower than 6 percent and the pH value is 6-8.
After adding new solution in the third step, the electrical property is increased from-30 mV to 0 potential, so that the stability of more than 80% of colloidal particles in the waste liquid is destroyed, the dispersed flocculate is coagulated by means of a hydraulic cyclone granulation technology to form a compact flocculating constituent, the dominant particle size distribution of large particles is 10-100um, the particle size distribution of more than 60% of particles is 60-100um, and the density of the flocculating constituent is not less than 0.1g/cm3The maximum water release rate is 25%.
Fourthly, performing secondary solid-liquid separation, and removing water in an unstable multiphase mixture of the waste drilling fluid after gel breaking and destabilization by means of physical filtration to achieve the effect of solid-phase and liquid-phase separation; the solid content in the removed wastewater is lower than 6 percent, the pH value is 6-8, and the method can be repeatedly applied to the whole dehydration treatment process, even the preparation of new drilling fluid; the water content of the dewatered solid slag is controlled to be 60-70%, and the solid slag can be used as a material for paving roads or pressing certain building materials.
And fifthly, storing the waste water and the solid waste, and respectively storing the separated liquid and the solid waste in a storage tank for subsequent treatment.
After the 1 volume of the waste water-based drilling fluid is treated, the water removal amount is 5-8 times of the liquid amount separated from solid and liquid naturally precipitated in a mud pit, the content of suspended matters in the water treated by the process is lower than 30mg/L, and the content of suspended matters in the liquid naturally precipitated in the mud pit is more than 120 mg/L and 300 mg/L.
Based on the composition and characteristics of the waste drilling fluid, the treatment performance of the waste water-based drilling fluid is enhanced by combining colloid chemistry theory and treatment technical principle, and a whole set of treatment process is developed, can be matched with drilling equipment for use, realizes simultaneous start, simultaneous operation and simultaneous well completion delivery of drilling engineering, and can ensure that the waste drilling fluid is recycled to achieve closed circulation.
[ example 2 ]
On the basis of the embodiment 1, the specific method for homogenizing the mixed phase in the second step is that the waste drilling fluid is conveyed to a plurality of sections of serially connected vibration separation sieves through a crawler-type conveyor belt, a spray head sprays spray liquid in a fog form onto the conveyor belt and the separation sieves in the conveying process, the liquid separated by the vibration separation sieves enters the third step after being homogenized and stirred, and the separated solid is collected.
During spraying, 1 volume of the waste rotary drilling fluid is sprayed with 0.5-1.5 volumes of spraying fluid.
The homogenizing stirring intensity is not lower than 180 r/min, and the hydraulic retention time is 10 min.
The waste liquid collected in the first step is conveyed to 5 sections of vibrating separating sieves connected in series through a crawler-type conveyor belt, the waste drilling fluid is flatly paved on the vibrating separating sieves, evenly paved on the surfaces of the sieves by means of vibration kinetic energy and translated forwards, and the treatment capacity of the vibrating sieves in unit time is 4-8m3H; meanwhile, the whole process of the fog leaching and vibration screening is realized by spraying the leaching solution on the waste drilling fluid after the leaching solution forms fog through a spray head; the solid slag after the vibration separation sieve enters a fourth step for re-dehydration, and the liquid separated in the second step enters a third step for further dehydrationAnd (6) processing.
Wherein the spraying liquid used for spraying is prepared into a mixed liquid in advance by water, a hydrochloric acid solution with the volume concentration of 10 percent and a calcium chloride solution with the volume concentration of 30 percent according to the volume ratio (1:0.3: 0.5); according to the difference of the solid content of the waste drilling fluid, spraying 0.5-1.5 volumes of leacheate on 1 volume of the waste drilling fluid according to the spraying ratio; the vibration separation sieve adopts 200-400-mesh sieves with different specifications, and the effective sieving area of a single vibration sieve is not less than 1.66 square meters; the homogenizing stirring intensity is not lower than 180 r/min, and the hydraulic retention time is 10 min. The pH value of the waste drilling fluid is adjusted, the electrolyte content is increased, and the liquid thixotropy is improved in the second step through shower liquid, so that the performance parameters of the waste drilling fluid are improved.
[ example 3 ]
On the basis of the embodiment 1 or the embodiment 2, the third step of gel breaking and destabilization is specifically carried out by adding 0.01-0.05 volume of 3 volume percent polyaluminum chloride solution into the mixed liquid, stirring at a stirring intensity of not less than 180 r/min, and continuously stirring for 5 min; then adding 0.01-0.03 volume of solution with the volume concentration of 0.5% of poly dimethyl diallyl ammonium chloride, wherein the stirring intensity is not lower than 30 r/min, and the hydraulic retention time is 15 min.
Adding 0.01-0.05 volume of 3% polyaluminium chloride solution into the liquid separated after the second step, wherein the stirring intensity is not lower than 180 r/min, and continuously stirring for 5 min; then adding 0.01-0.03 volume of solution with 0.5 percent of poly dimethyl diallyl ammonium chloride, stirring the solution at the intensity of not less than 30 revolutions per minute, and keeping the solution for 15 minutes by waterpower.
And in the fourth step, performing filter pressing on the liquid obtained after the third step by adopting a filter pressing technology, and respectively storing the liquid and the solid waste after filter pressing separation in a storage tank for subsequent treatment. The filter cloth for filter pressing is industrial cloth woven by polypropylene short fibers, and the specification is 300-500 meshes.
The components and processes of the present embodiments that are not described in detail are well known in the art and are not necessarily described herein in detail.
Claims (6)
1. A dehydration method of waste water-based drilling fluid is characterized by comprising the following steps: comprises the following specific steps
Firstly, collecting waste drilling fluid, and collecting the waste drilling fluid from all sewage outlets of drilling solid control equipment;
secondly, homogenizing the mixed phase, and improving the performance parameters of the waste drilling fluid by adding shower liquid, so that the solid content of the waste drilling fluid is lower than 20%, the conductivity is 75-95ms/cm, and the specific resistance of sludge is lower than 35 multiplied by 109S2The electric area of the liquid is-30 mV to-20 mV, and the solid and the liquid in the drilling waste liquid are preliminarily separated after the performance parameters are improved; the spraying liquid is prepared by mixing water, hydrochloric acid solution with volume concentration of 10% and calcium chloride solution with volume concentration of 30% according to the volume ratio of 1:0.3: 0.5;
thirdly, breaking gel and destabilizing, namely adding a polyaluminium chloride solution into the mixed liquid and then stirring the mixed liquid, and then adding a poly dimethyl diallyl ammonium chloride solution into the mixed liquid and stirring the mixed liquid again to destroy the stability of a gel system in the mixed liquid after mixed phase homogenization and condense and aggregate suspended particulate matters into large particulate matters with the particle size of more than 10 microns;
fourthly, performing secondary solid-liquid separation, and removing water in an unstable multiphase mixture of the waste drilling fluid after gel breaking and destabilization by means of physical filtration to achieve the effect of solid-phase and liquid-phase separation;
and fifthly, storing the waste water and the solid waste, and respectively storing the separated liquid and the solid waste in a storage tank for subsequent treatment.
2. The method of dewatering waste water-based drilling fluid of claim 1, wherein: the concrete method of the mixed phase homogenization in the second step is that the waste drilling fluid is conveyed to a plurality of sections of vibration separation sieves connected in series through a crawler-type conveyor belt, fog-like spray liquid is sprayed onto the conveyor belt and the separation sieves through spray heads in the conveying process, liquid separated by the vibration separation sieves enters the third step after being homogenized and stirred, and separated solids are collected.
3. The method of dewatering waste water-based drilling fluid of claim 2, wherein: during spraying, 1 volume of the waste rotary drilling fluid is sprayed with 0.5-1.5 volumes of spraying fluid.
4. The method of dewatering waste water-based drilling fluid of claim 2, wherein: the homogenizing stirring intensity is not lower than 180 r/min, and the hydraulic retention time is 10 min.
5. The method of dewatering waste water-based drilling fluid of claim 1, wherein: the third step of gel breaking and destabilization is specifically that 0.01 to 0.05 volume of polyaluminium chloride solution with volume concentration of 3 percent is added into the mixed liquid, the stirring intensity is not lower than 180 r/min, and the stirring is continued for 5 min; then adding 0.01-0.03 volume of solution with the volume concentration of 0.5% of poly dimethyl diallyl ammonium chloride, wherein the stirring intensity is not lower than 30 r/min, and the hydraulic retention time is 15 min.
6. The method of dewatering waste water-based drilling fluid of claim 1, wherein: and in the fourth step, performing filter pressing on the liquid obtained after the third step by adopting a filter pressing technology, and respectively storing the liquid and the solid waste after filter pressing separation in a storage tank for subsequent treatment.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911080684.XA CN110845038A (en) | 2019-11-07 | 2019-11-07 | Dewatering method for waste water-based drilling fluid |
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| CN201911080684.XA CN110845038A (en) | 2019-11-07 | 2019-11-07 | Dewatering method for waste water-based drilling fluid |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111500273A (en) * | 2020-05-21 | 2020-08-07 | 盘锦派普环保科技有限公司 | Method for preparing fracturing fluid after water-based drilling fluid sewage treatment |
| CN111946278A (en) * | 2020-08-19 | 2020-11-17 | 中国地质科学院探矿工艺研究所 | Harmless treatment method for geological core drilling waste flushing fluid |
| CN116177780A (en) * | 2022-12-11 | 2023-05-30 | 延安圣洋环保有限公司 | Treatment method of drilling waste liquid |
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| JP2006000831A (en) * | 2004-06-14 | 2006-01-05 | Sanwa Kizai Co Ltd | System for treating mud water and mud, and apparatus therefor |
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| CN116177780A (en) * | 2022-12-11 | 2023-05-30 | 延安圣洋环保有限公司 | Treatment method of drilling waste liquid |
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Application publication date: 20200228 |