CN103626344A - Water-based drilling fluid waste solid-liquid separation equipment and method - Google Patents

Water-based drilling fluid waste solid-liquid separation equipment and method Download PDF

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Publication number
CN103626344A
CN103626344A CN201310561998.8A CN201310561998A CN103626344A CN 103626344 A CN103626344 A CN 103626344A CN 201310561998 A CN201310561998 A CN 201310561998A CN 103626344 A CN103626344 A CN 103626344A
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tank
drilling fluid
water
treatment
whizzer
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CN201310561998.8A
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CN103626344B (en
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彭春耀
杨金荣
刘义元
刘洪涛
张鑫
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China National Petroleum Corp
CNPC Great Wall Drilling Co
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CNPC Great Wall Drilling Co
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Abstract

The invention provides water-based drilling fluid solid-liquid separation equipment and method. A flocculant and the like are added into the pretreated water-based drilling fluid waste, and the water and solid phase are centrifuged and separated out through a centrifuge to realize solid-liquid separation. The separated wastewater reaches the standard after secondary flocculation and filtration treatment and can be recycled at the well site or discharged, and the separated waste residue reaches the standard for stacking after curing treatment. After the water-based drilling fluid waste is treated by the method, the main pollutant indexes of the leachate of the wastewater and waste residue reach the GB8978-1996 Integrated Wastewater Discharge Standard (second-level requirements).

Description

Water-base drilling fluid waste solid-liquid separating device and method
Technical field
The present invention relates to a kind of drilling fluid waste treating device and method, particularly water-base drilling fluid waste solid-liquid separating device and method.
Background technology
Water-base drilling fluid waste is the pollutent producing in Process of Oil Well Drilling.It is a kind of complicated heterogeneous system that contains mineral oil, phenolic compound and heavy metal, and its leach liquor has compared with high toxicity.Oil drilling is produced all will produce a large amount of water-base drilling fluid wastes every day, water-base drilling fluid waste directly discharge can have influence on nutrient environment condition and the quality thereof of plant growth, long-term accumulation can cause the havoc of surface vegetation, contaminated soil and water source, the existence that jeopardizes the mankind.At present, both at home and abroad conventional water-base drilling fluid method for innocent treatment mainly contains following several: 1, landfill method 2, solidify and combine 3 with comprehensive utilization, soil cultivating method 4, pump into safe formation or annular space method 5, closed-loop system method.All there is shortcoming more or less in above several method.Landfill method is fairly simple, but is subject to the restriction in environment place; The curing method combining with comprehensive utilization is because not carrying out solid-liquid separation, and after solidifying, volume of waste does not reduce, and gives finally and processes and increased difficulty; Soil cultivating method is only applicable to the area of vast and opposed flattened, and needs suitable Soil structure; Pumping into safe formation and annular space method is a kind of method of limited use; Closed-loop system method must could be used economical in the situation that.Therefore the Method and process, having needed carries out subsequent disposal to oil-field water base drilling fluid waste.
Summary of the invention
For overcoming the defect that in above-mentioned prior art, water-base drilling fluid method for innocent treatment exists, the present invention proposes a kind of water-base drilling fluid solid-liquid separating device and method, it is to add flocculation agent etc. through in pretreated water-base drilling fluid waste, by whizzer, make water and solid phase centrifugation out, realize solid-liquid separation.Isolated waste water can be realized well site reuse or discharge after secondary flocculation, filtration treatment are up to standard, and isolated waste residue is by solidification treatment, stacking up to standard.By this kind of method, make the principal pollutant index of the leach liquor of waste water after water-base drilling fluid offal treatment, waste residue reach GB8978-1996 < < integrated wastewater discharge standard > > (secondary requirement).
Technical scheme of the present invention is as follows:
A kind of water-base drilling fluid solid-liquid separating equipment, mainly comprise make up a prescription sled and two sled formula devices of buffering sled, make up a prescription to prize and be mainly provided with medicine tank, impeller pump, dispensing hopper, automatic feeder, agitator, a plurality of METERING DIAPHRAGM PUMPS, in medicine tank, be arranged to a plurality of medicines chamber, medicine tank one side is connected with dispensing hopper and impeller pump by pipeline, medicine tank opposite side is connected with METERING DIAPHRAGM PUMPS by pipeline, and a plurality of agitators for dosing and automatic feeder are installed above medicine tank; On buffering sled, tank storehouse and spiral pump are installed, tank storehouse is separated into pre-treatment drilling fluid holding tank and sewage collecting tank, pre-treatment holding tank and sewage collecting tank bottom are equipped with sand removing hole, spiral pump one side is connected with tank storehouse by pipeline, spiral pump opposite side is connected with mixing duct, a plurality of metering diaphragm pump discharges are connected with this mixing duct multiple spot by flexible pipe respectively, tank is provided with whizzer above storehouse, whizzer is connected with mixing duct end, in mixing duct, be provided with mixing tank, whizzer bottom is provided with sediment outflow groove and leakage fluid dram.
A water-base drilling fluid solid-liquid separating method, mainly comprises the following steps:
A, by the drilling fluid producing in drilling process and waste gathering in holding tank, by air supporting effect, realize oily water separation;
B, drilling fluid waste import in whizzer by pump, and the pre-treatment through whizzer, throws away the solid phases such as barite, and liquid phase is collected in pre-treatment drilling fluid holding tank;
C, with spiral pump, drilling fluid in pre-treatment drilling fluid holding tank is extracted out, by METERING DIAPHRAGM PUMPS, inorganic flocculating agent is extracted out, one mixes by mixing tank, by mixing tank, mix again with one of the organic floculant that METERING DIAPHRAGM PUMPS is extracted out afterwards, import whizzer, pre-treatment drilling fluid reacts with inorganic flocculating agent, organic floculant, pass through again the sedimentation centrifugation of whizzer, solid phase and liquid phase separation, solid phase is discharged and is collected, and liquid phase is collected in sewage collecting tank;
Sewage in d, sewage collecting tank, by further adding organic floculant, allows solid phase liquid phase separation, and liquid phase sewage is taken away, and solid phase is collected and in tank, carried out re-treatment;
E, sewage are done further fine filtering and are processed, and are processed into the clear water of qualified discharge.
In the present invention, the solid-liquid separating method of water-base drilling fluid is mainly used following principle:
A, air supporting principle: the micro-bubble that height of formation disperses in water, adhere to solid or the liquid particle of hydrophobic group in water, after particle adhesion bubble, form apparent density and be less than the flco of water and float to the water surface, form scum layer and struck off, thereby reach solid-liquid or the separation of liquid liquid.
B, inorganic flocculating agent flocculating principles: in drilling fluid, most of particle belongs to colloidal solid scope, be less than 1 micron, and these fine particles are difficult to precipitation.Inorganic flocculating agent is soluble in water, by dissolving and absorbing water, can there is intense hydrolysis, and there are various polyreactions in hydrolysis simultaneously, generation has the polynuclear complex of longer linear structure, these complex compounds can effectively reduce or eliminate the hair current potential of colloid in solution, and by charge neutrality, the volume of adsorption bridging and flco is swept effect, make coacervation of colloid, and form the gel that the polymerization degree is very high.
C, organic floculant flocculating principles: be a kind of bridging agent, it passes through adsorption bridging, little flco is linked together, it is large that the flco particle diameter forming becomes, Subsidence trend is more obvious, and in flco sinking process, by the volume of flco, sweeps effect, carry out more little flco, thereby reach the object of processing.Cationic have extremely strong flocculation performance to the various suspended particulates in aqueous medium, particularly those colloids with negative charge more had to superiority.Anionic makes between particle to build bridge or to make particle coacervation form large throw out by charge neutralization.Amphoteric is on macromolecule chain section, to contain the water-soluble polymers of both positive and negative electric charge group simultaneously, is applicable to process the pollutent with different electric charges.
D, centrifugal principle: the powerful centrifugal force that centrifuge rotor high speed rotating produces, the settling velocity of particle in accelerating liquid, the separating substances of different settling ratios and buoyant density in the drilling fluid of processing and waste is opened, thereby reached the object of separated solid phase and liquid phase.
Water-base drilling fluid and waste solid-liquid separating device and method highlight effect aspect following five:
1, environment protection is had to important breakthrough, the clear water after processing can be realized well site reuse or discharge, and isolated waste residue can pass through solidification treatment, reaches discharging standards and stacks, and has promoted oil-gas exploration and development business and environment protection coordinated development.
2, this to install integrated degree high, volume is little, small portable is easy to resettlement, need not dig blowdown hole simultaneously, has saved a large amount of floor spaces.
3, this device can be processed 400 water-base drilling fluid and wastes in many ways for one day, and processing efficiency is high.
4, this device has very strong adaptability, can process low viscosity drilling fluid waste, can process high viscosity drilling fluid waste again.
5, this technical feasibility, treatment condition are gentle, and processing cost is lower, has broad application prospects.
Accompanying drawing explanation
Fig. 1 is overall device vertical view
Fig. 2 is the structural representation that makes up a prescription and prize
Fig. 3 is the structural representation of buffering sled
1-makes up a prescription and prizes 2-buffering sled
2-1, ladder 2-2, guardrail 2-3, agitator 2-4, pipeline interface 2-5, METERING DIAPHRAGM PUMPS 2-6, medicine tank 2-7, automatic feeder 2-8, manifold 2-9, dispensing hopper 2-10, impeller pump
3-1, ladder 3-2, guardrail 3-3, whizzer 3-4, mixing line 3-5, leakage fluid dram 3-6, sand removing hole 3-7, sediment outflow groove 3-8, tank storehouse 3-9, manifold 3-10, spiral pump
Embodiment
As shown in Figures 2 and 3, in well site, build water-base drilling fluid waste solid-liquid separating device, make up a prescription sled 1 for two-layer steel bar framework structure, in the sled end of making up a prescription, be provided with ladder 2-1 and enter upper strata for workman, upper strata is also provided with guardrail 2-2, lower floor is provided with medicine tank 2-6, in medicine tank, be provided with a plurality of medicines chamber for the different medicines of splendid attire, organic floculant and inorganic flocculating agent are placed in respectively different medicine chambers, medicine tank one side is connected with dispensing hopper 2-9 and impeller pump 2-10 by pipeline, a plurality of agitator 2-4 and automatic feeders for dosing are installed above medicine tank, all be used for the making up a prescription and add of medicine, medicine tank opposite side is connected with METERING DIAPHRAGM PUMPS 2-5 by pipeline, METERING DIAPHRAGM PUMPS has a plurality of (shown in Fig. 2, having 4), between METERING DIAPHRAGM PUMPS and medicine chamber, by pipeline, be connected and can realize the mode of getting it filled arbitrarily, METERING DIAPHRAGM PUMPS opposite side is connected with pipeline interface 2-4 as spare interface, make up a prescription to prize a plurality of manifold 2-8 are installed, buffering sled is Compound Steel muscle skeleton construction, in the sled end of making up a prescription, be provided with ladder 3-1 and enter upper strata for workman, upper strata is also provided with guardrail 3-2, on buffering sled, a plurality of manifold 3-9 are installed, the lowest layer is provided with tank storehouse 3-8 and spiral pump 3-10, tank storehouse is separated into pre-treatment drilling fluid holding tank and sewage collecting tank (having 4 tanks shown in Fig. 3), pre-treatment holding tank is for the pretreated drilling fluid of splendid attire and waste thereof, sewage collecting tank is for the sewage of mobile phone after whizzer solid-liquid separation, pre-treatment holding tank and sewage collecting tank bottom are equipped with sand removing hole 3-6, for clearing up the solid that tank precipitates, tank storehouse is connected with thribble board by fastening piece, spiral pump one side is connected with tank storehouse by pipeline, spiral pump opposite side is connected with mixing line 3-4, a plurality of metering diaphragm pump discharges are connected with this mixing line multiple spot by flexible pipe respectively, in described mixing line, be provided with mixing tank (not shown), METERING DIAPHRAGM PUMPS first extracts the drilling fluid of inorganic flocculating agent and spiral pump extraction out and waste is transported in mixing line jointly and utilize mixing tank in mixing line, to be mixed to form mixture, then, METERING DIAPHRAGM PUMPS is extracted organic floculant out again and is fully mixed in mixing line with foregoing mixture, in mixing line, reacted mixture is transported in whizzer, thribble board is provided with many bench centrifuges 3-3 (having 2 shown in figure), whizzer bottom is provided with sediment outflow groove 3-7 and leakage fluid dram 3-5, the solid producing after centrifugation is outside sediment outflow groove device for transferring, liquid is collected in sewage collecting tank by pipeline through leakage fluid dram.
On well site, set up special drilling fluid and waste gathering tank field, the drilling fluid producing in drilling process and waste gathering, in holding tank, by air supporting effect, are realized to oily water separation; The drilling fluid waste of realizing after oily water separation imports in whizzer by pump, and the pre-treatment through whizzer, throws away the solid phases such as barite, and liquid phase is collected in pre-treatment drilling fluid holding tank; With spiral pump, the drilling fluid in pre-treatment drilling fluid holding tank is extracted out, by METERING DIAPHRAGM PUMPS, inorganic flocculating agent is extracted out, one enters mixing duct and mixes by built-in mixing tank, enter mixing duct and mix by mixing tank again with one of the organic floculant that METERING DIAPHRAGM PUMPS is extracted out afterwards, import whizzer, pre-treatment drilling fluid reacts in pipeline with inorganic flocculating agent, organic floculant, pass through again the sedimentation centrifugation of whizzer, solid phase and liquid phase separation, solid phase is discharged and is collected, and liquid phase is collected in sewage collecting tank; Sewage in sewage collecting tank, by further adding organic floculant, allows solid phase liquid phase separation, and liquid phase sewage is taken away, and solid phase is collected and in tank, carried out re-treatment; Sewage is done further fine filtering and is processed, and is processed into the clear water of qualified discharge.
Water-base drilling fluid in the present invention and waste solid-liquid separating device and method have been carried out test in place, and test effect is good.Under normal circumstances, every bench centrifuge processing water-base drilling fluid per hour waste 10-20m 3, working efficiency is higher.The principal pollutant index of the waste water after processing, waste residue leach liquor reaches GB8978-1996 < < integrated wastewater discharge standard > > (secondary requirement).
Water-base drilling fluid in the present invention and waste solid-liquid separating device, can realize with boring and processing, and also can focus on; Equipment adopts integrated assembling, and mode is reasonable, convenient transportation, and floor space is little; Equipment protecting equipment is complete, safe and reliable to operation; Technique is simple, easy to operate; Apparatus structure is simple, energy-conservation, and processing cost is low.

Claims (2)

1. a water-base drilling fluid solid-liquid separating equipment, it is characterized in that, mainly comprise make up a prescription sled and two sled formula devices of buffering sled, make up a prescription to prize and be mainly provided with medicine tank, impeller pump, dispensing hopper, automatic feeder, agitator, a plurality of METERING DIAPHRAGM PUMPS, in medicine tank, be arranged to a plurality of medicines chamber, medicine tank one side is connected with dispensing hopper and impeller pump by pipeline, medicine tank opposite side is connected with METERING DIAPHRAGM PUMPS by pipeline, and a plurality of agitators for dosing and automatic feeder are installed above medicine tank; On buffering sled, tank storehouse and spiral pump are installed, tank storehouse is separated into pre-treatment drilling fluid holding tank and sewage collecting tank, pre-treatment holding tank and sewage collecting tank bottom are equipped with sand removing hole, spiral pump one side is connected with tank storehouse by pipeline, spiral pump opposite side is connected with mixing duct, a plurality of metering diaphragm pump discharges are connected with this mixing duct multiple spot by flexible pipe respectively, tank is provided with whizzer above storehouse, whizzer is connected with mixing duct end, in mixing duct, be provided with mixing tank, whizzer bottom is provided with sediment outflow groove and leakage fluid dram.
2. a water-base drilling fluid solid-liquid separating method that utilizes the equipment described in claim 1 to carry out, is characterized in that, mainly comprises the following steps:
A, by the drilling fluid producing in drilling process and waste gathering in holding tank, by air supporting effect, realize oily water separation;
B, drilling fluid waste import in whizzer by pump, and the pre-treatment through whizzer, throws away the solid phases such as barite, and liquid phase is collected in pre-treatment drilling fluid holding tank;
C, with spiral pump, drilling fluid in pre-treatment drilling fluid holding tank is extracted out, by METERING DIAPHRAGM PUMPS, inorganic flocculating agent is extracted out, one mixes by mixing tank, by mixing tank, mix again with one of the organic floculant that METERING DIAPHRAGM PUMPS is extracted out afterwards, import whizzer, pre-treatment drilling fluid reacts with inorganic flocculating agent, organic floculant, pass through again the sedimentation centrifugation of whizzer, solid phase and liquid phase separation, solid phase is discharged and is collected, and liquid phase is collected in sewage collecting tank;
Sewage in d, sewage collecting tank, by further adding organic floculant, allows solid phase liquid phase separation, and liquid phase sewage is taken away, and solid phase is collected and in tank, carried out re-treatment;
E, sewage are done further fine filtering and are processed, and are processed into the clear water of qualified discharge.
CN201310561998.8A 2013-11-05 2013-11-05 Water-based drilling fluid waste solid-liquid separation equipment and method Active CN103626344B (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104030494A (en) * 2014-06-30 2014-09-10 成都高普石油工程技术有限公司 Solid-liquid separation method of waste drilling liquid
CN104086023A (en) * 2014-06-30 2014-10-08 成都高普石油工程技术有限公司 Method conducive to reducing energy consumption for solid-liquid separation of drilling waste liquid
CN105443077A (en) * 2015-10-29 2016-03-30 中国石油集团川庆钻探工程有限公司长庆钻井总公司 Gas well surface layer well completion liquid-solid separation construction process
CN108585278A (en) * 2018-05-16 2018-09-28 延安双丰石油技术股份有限公司 A kind of waste liquid of drilling processing system
CN110255763A (en) * 2019-06-20 2019-09-20 湖北中地星河环保科技有限公司 A kind of leachate integrated processing unit and method
US10800690B2 (en) 2016-09-26 2020-10-13 Wilmac, Inc. Portable liquid recovery system with optional preliminary processor and feed

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CN101863529A (en) * 2010-07-02 2010-10-20 华油惠博普科技股份有限公司 Modular, skid-mounted and mobile oil-bearing sludge treatment equipment
CN202881019U (en) * 2012-10-25 2013-04-17 中国石油化工股份有限公司 Movable drilling waste liquid treatment device
CN103159387A (en) * 2013-04-08 2013-06-19 珠海海啸生物科技有限公司 Portable oilfield oil sludge purifying treatment and recovery device and method

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CN1458076A (en) * 2002-05-17 2003-11-26 石油大学(北京) Coagulating and dewatering treatment method for waste drilling fluid
CN101279811A (en) * 2008-05-29 2008-10-08 濮阳市天地人环保工程技术有限公司 Four-phase solid-liquid separation method for well drilling wastes
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104030494A (en) * 2014-06-30 2014-09-10 成都高普石油工程技术有限公司 Solid-liquid separation method of waste drilling liquid
CN104086023A (en) * 2014-06-30 2014-10-08 成都高普石油工程技术有限公司 Method conducive to reducing energy consumption for solid-liquid separation of drilling waste liquid
CN105443077A (en) * 2015-10-29 2016-03-30 中国石油集团川庆钻探工程有限公司长庆钻井总公司 Gas well surface layer well completion liquid-solid separation construction process
US10800690B2 (en) 2016-09-26 2020-10-13 Wilmac, Inc. Portable liquid recovery system with optional preliminary processor and feed
CN108585278A (en) * 2018-05-16 2018-09-28 延安双丰石油技术股份有限公司 A kind of waste liquid of drilling processing system
CN110255763A (en) * 2019-06-20 2019-09-20 湖北中地星河环保科技有限公司 A kind of leachate integrated processing unit and method

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Patentee before: China National Petroleum Corporation Great Wall Drilling Engineering Co.,Ltd.

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