CN111847705A - Waste polymer drilling fluid treatment and recycling method - Google Patents
Waste polymer drilling fluid treatment and recycling method Download PDFInfo
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- CN111847705A CN111847705A CN202010585365.0A CN202010585365A CN111847705A CN 111847705 A CN111847705 A CN 111847705A CN 202010585365 A CN202010585365 A CN 202010585365A CN 111847705 A CN111847705 A CN 111847705A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/06—Arrangements for treating drilling fluids outside the borehole
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/06—Arrangements for treating drilling fluids outside the borehole
- E21B21/063—Arrangements for treating drilling fluids outside the borehole by separating components
- E21B21/065—Separating solids from drilling fluids
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/06—Arrangements for treating drilling fluids outside the borehole
- E21B21/068—Arrangements for treating drilling fluids outside the borehole using chemical treatment
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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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
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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
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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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F2001/007—Processes including a sedimentation step
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic 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
Abstract
The invention discloses a method for treating and recycling waste polymer drilling fluid, and relates to the technical field of petroleum and natural gas drilling fluid recycling. Step 1: adding 5% of inhibitor A and 3% of inhibitor B into the polymer drilling fluid by mass ratio, pretreating the polymer drilling fluid, and then performing subsequent treatment; the inhibitor A is one of potassium chloride, potassium formate and sodium chloride; the inhibitor B is one of calcium chloride, calcium acetate and calcium bromide. By adopting the method, the influence of the strong water-sensitive stratum on the polymer drilling fluid system can be effectively dealt with, and the water yield of the treated polymer drilling fluid system can be greatly improved.
Description
Technical Field
The invention relates to the technical field of petroleum and natural gas drilling fluid recycling.
Background
The surface layer section of the Chongqing area is mainly a large section of mudstone with extremely strong water sensitivity and is easy to hydrate and disperse, so that a polymer drilling fluid system is greatly invaded by a poor solid phase in the rapid drilling process, and the polymer drilling fluid has high low-density poor solid phase content, high density and quick viscosity-shear rising. The drill bit is easy to be wrapped by mud in the drilling process, the drilling speed is reduced, and the blockage is easy to occur in the tripping operation process. After the polymer drilling fluid drills the surface layer section, the polymer drilling fluid cannot be recycled and can only be completely discarded due to the fact that the poor solid phase content is too high and is difficult to clean, and the drilling operation cost and the safety and environmental protection risks are greatly increased.
In a polymer drilling fluid system used in oil and gas drilling engineering, a colloid system is more stable due to the addition of a high molecular polymer, and waste drilling fluid after drilling is more stable. A plurality of methods are proposed for treating the waste polymer drilling fluid at home and abroad, such as chemical treatment, biological treatment, solid-liquid separation and the like.
Chinese patent documents with publication number CN106242119A and publication date 2016, 12 and 21 disclose a sewage treatment method, in particular to a gel breaker for waste polysulfonate drilling fluid and a gel breaking method thereof, wherein quicklime is firstly added and stirred for pretreatment, and concentrated sulfuric acid is used for regulating the pH value of the gel breaker to 4-5; adding sulfamic acid, breaking gel, flocculating, mechanically dewatering, and centrifuging to obtain water for reuse. According to the gel breaker for the waste polysulfonate drilling fluid and the gel breaking method thereof, the combination of the quick lime, the concentrated sulfuric acid and the sulfamic acid can meet the gel breaking requirement of the waste polysulfonate drilling fluid, and can achieve the purpose of separating and specially recycling the prepared drilling fluid, thereby playing the roles of protecting the environment, saving energy, reducing emission and recycling.
The methods of treating drilling fluids represented by the above patent documents only mention that quicklime pretreatment, specifically treatment by a combination of "quicklime, concentrated sulfuric acid, sulfamic acid" can be used. The water yield of the polymer-sulfonated drilling fluid after treatment can reach 78%, but the treatment effect of the treatment method is not ideal under the condition that the surface layer section of the Chongqing area is mainly large-section mudstone with extremely strong water sensitivity and is easy to hydrate and disperse, and the technical problems that the polymer drilling fluid system is invaded by a large amount of poor solid phase in the rapid drilling process, the polymer drilling fluid is high in low-density poor solid phase content, high in density and high in viscosity-shear rising speed and the like still exist.
Disclosure of Invention
The invention aims to provide a method for treating and recycling waste polymer drilling fluid, aiming at overcoming the defects and shortcomings of the prior art, and by adopting the method, the influence of a strong water-sensitive stratum on a surface layer on a polymer drilling fluid system can be effectively dealt with, and the water yield of the treated polymer drilling fluid system can be greatly improved.
The invention is realized by adopting the following technical scheme:
a method for treating and recycling waste polymer drilling fluid is characterized by comprising the following steps:
step 1: adding 5% of inhibitor A and 3% of inhibitor B into the polymer drilling fluid by mass ratio, pretreating the polymer drilling fluid, and then performing subsequent treatment; the inhibitor A is one of potassium chloride, potassium formate and sodium chloride; the inhibitor B is one of calcium chloride, calcium acetate and calcium bromide.
The subsequent treatment comprises the following steps:
step 2: during the drilling process of the drilling fluid on the surface layer, the combination of solid phase control equipment is used: a 200-mesh vibrating screen, a 240-mesh desanding and desliming device and a 3000-turn high-speed centrifuge;
and step 3: and (3) storing the polymer drilling fluid after drilling the surface layer in a sedimentation tank, adding 0.05% of quicklime by mass of the polymer drilling fluid for treatment, and standing for 1 h.
And 4, step 4: and (3) placing the supernatant fluid treated in the step (3) into a circulating tank, and continuously adding 0.1% of a gel breaker into a settling pond according to the mass ratio of the polymer drilling fluid treated in the step (3).
And 5: and (4) continuously adding 0.2% of flocculating agent into the sedimentation tank according to the mass ratio of the polymer drilling fluid treated in the step (4), and standing for 2 hours.
Step 6: and (3) placing the supernatant fluid treated in the step (5) into a circulating tank, further carrying out solid-liquid separation on the residual polymer drilling fluid in a settling tank through a pressure filter, transferring the separated liquid phase into a clear fluid circulating tank, and scrapping the solid phase.
And 7: after the treatment of the steps, 20 percent of clean water is mixed into the separated liquid phase according to the weight ratio, and the drilling fluid can be recycled and prepared.
The flocculating agent is one of polyaluminium chloride, cationic polyacrylamide and polyferric sulfate.
The gel breaker is one of ammonium persulfate, sodium hypochlorite and aluminum sulfate.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, 5% of inhibitor A and 3% of inhibitor B are added into the polymer drilling fluid to pretreat the polymer drilling fluid, so that the inhibition of the polymer drilling fluid is improved, the hydration dispersion of surface section mudstone is inhibited, and the invasion of poor solid phase of the polymer drilling fluid in the surface drilling process is reduced. The above-mentioned optimum ratio is selected only after several experiments according to the specific ratio relationship, and the experimental data in the examples section shows that: the rolling recovery rate of the 8# sample polymer drilling fluid +5% inhibitor A +3% inhibitor B system reaches 79%, the addition of the inhibitor A and the inhibitor B is continuously increased, namely the rolling recovery rate of the 9# system and the 12# system is only increased by 1%, the inhibition performance is not changed greatly, and the requirement on the salt resistance of a matched treating agent in the polymer drilling fluid is higher, so that the system combination of the 8# sample is selected, the 5% inhibitor A +3% inhibitor B is added into the polymer drilling fluid, and the inhibition performance is optimal while the original system compatibility of the polymer drilling fluid is ensured. After the treatment, the influence of a strong water-sensitive stratum on a surface layer on a polymer drilling fluid system can be effectively dealt with, and the water yield of the treated polymer drilling fluid system can be greatly improved.
2. In the invention, the polymer drilling fluid after drilling the surface layer is stored in a sedimentation tank, 0.05 percent of quicklime is added for treatment, and the mixture is kept stand for 1 hour. The above-mentioned optimum ratio is selected only after several experiments according to the specific ratio relationship, and the experimental data in the examples section shows that: the adding amount of the quicklime is 0.05%, the precipitation volume of the clear liquid is maximum when the standing time is 1h, the adding amount of the quicklime and the standing time are continuously increased, and the precipitation volume of the clear liquid is not obviously increased.
3. In the invention, supernatant fluid obtained after the treatment in the step 3 is placed in a circulating tank, and 0.1% of a gel breaker is continuously added into a sedimentation tank. The above-mentioned optimum ratio is selected only after several experiments according to the specific ratio relationship, and the experimental data in the examples section shows that: when the addition of the gel breaker is 0.1%, the precipitation volume of the clear liquid is the largest, and the addition of the gel breaker is increased continuously, so that the precipitation volume of the clear liquid is not increased obviously.
4. In the invention, 0.2 percent of flocculating agent is continuously added into the sedimentation tank and kept stand for 2 hours. The above-mentioned optimum ratio is selected only after several experiments according to the specific ratio relationship, and the experimental data in the examples section shows that: the addition of the flocculant is 0.2%, and the precipitation volume of the clear liquid is maximum when the standing time is 2 hours. And increasing the addition of the flocculating agent, and reducing a clear liquid precipitation system.
5. The solid-liquid separation rate of the polymer drilling fluid can reach 85% (namely the separation liquid phase accounts for 85% of the total amount of the polymer drilling fluid) through the treatment of the steps 1 to 6 and experimental data verification. The technical effect is obviously superior to that of the prior various similar products.
6. In the invention, 20% of clear water is mixed in the separated liquid phase according to the weight ratio, and the experimental result shows that when 80% of separated liquid phase is mixed with 20% of clear water to prepare the drilling fluid, all basic performance indexes meet the design requirements.
Detailed Description
Example 1
As a preferred embodiment of the present invention, a method for treating and recycling waste polymer drilling fluid is disclosed, which comprises: step 1: adding 5% of inhibitor A and 3% of inhibitor B into the polymer drilling fluid by mass ratio, pretreating the polymer drilling fluid, improving the inhibition of the polymer drilling fluid, inhibiting the hydration and dispersion of surface section mudstone, reducing the invasion of poor solid phase of the polymer drilling fluid in the surface drilling process, and then performing subsequent treatment; the inhibitor A is one of potassium chloride, potassium formate and sodium chloride; the inhibitor B is one of calcium chloride, calcium acetate and calcium bromide.
Experiment 1, selecting surface section mudstone, and testing the rolling recovery rate of a sample according to GB/T16783.1.
The following 1# -12# samples are obtained by dividing the same polymer drilling fluid into 12 parts, and the initial parameters of the 12 parts of samples are consistent.
The experimental result shows that the rolling recovery rate of the 8# sample polymer drilling fluid +5% inhibitor A +3% inhibitor B system reaches 79%, the addition of the inhibitor A and the inhibitor B is continuously increased, namely the rolling recovery rate of the 9# system and the 12# system is only increased by 1%, the inhibition performance is not greatly changed, and the requirement on the salt resistance of a matched treating agent in the polymer drilling fluid is higher, so that the system combination of the 8# sample is selected, and the 5% inhibitor A +3% inhibitor B is added into the polymer drilling fluid, so that the original system compatibility of the polymer drilling fluid is ensured, and the inhibition performance is optimal.
Example 2
On the basis of example 1, a more preferred embodiment of the invention is:
the subsequent treatment comprises the following steps:
step 2: during the drilling process of the drilling fluid on the surface layer, the combination of solid phase control equipment is used: a 200-mesh vibrating screen, a 240-mesh desanding and desliming device and a 3000-turn high-speed centrifuge;
and step 3: and (3) storing the polymer drilling fluid after drilling the surface layer in a sedimentation tank, adding 0.05% of quicklime by mass of the polymer drilling fluid for treatment, and standing for 1 h.
Experiment 2: taking 1000ml and 5 parts of polymer drilling fluid after drilling the surface layer to form 1# -5# samples, wherein all initial parameters of all samples are consistent, adding different amounts of quicklime into each part of drilling fluid, fully stirring and reacting, standing for a certain time, and testing the precipitation volume of supernatant.
The experimental result shows that the addition of the quicklime is 0.05%, the precipitation volume of the clear liquid is maximum when the standing time is 1h, the addition of the quicklime and the standing time are continuously increased, and the precipitation volume of the clear liquid is not obviously increased.
Example 3
On the basis of example 2, the more preferred embodiment of the invention is: and (3) placing the supernatant liquid treated in the step (3) into a circulation tank, pumping the supernatant liquid treated in the step (3) into the circulation tank which is cleaned, continuously adding 0.1% of a gel breaker into a sedimentation tank, fully stirring and reacting, neutralizing the negative charges on the surfaces of clay particles, curling polymer high molecular chains, and weakening the stability of a polymer drilling fluid system.
The gel breaker is one of ammonium persulfate, sodium hypochlorite and aluminum sulfate.
Experiment 3: and (3) taking 1000ml and 4 parts of the lower-layer polymer drilling fluid treated in the step (3) to form 1# -4# samples, wherein the initial parameters of the samples are consistent, adding different amounts of gel breakers into each part of the drilling fluid, fully stirring and reacting, standing for a certain time, and testing the precipitation volume of the upper-layer clear liquid. 
The experimental result shows that the precipitation volume of the clear liquid is the largest when the dosage of the gel breaker is 0.1%, and the precipitation volume of the clear liquid is not obviously increased when the dosage of the gel breaker is continuously increased.
Example 4
On the basis of example 3, a more preferred embodiment of the invention is: and (4) continuously adding 0.2% of flocculating agent into the sedimentation tank according to the mass ratio of the polymer drilling fluid treated in the step (4), performing flocculation sedimentation on the superfine inferior solid phase in the polymer drilling fluid in the modes of adsorption bridging, coating and the like, fully stirring for reaction, standing for 2 hours, and increasing the solid-liquid separation degree of the waste polymer.
The flocculating agent is one of polyaluminium chloride, cationic polyacrylamide and polyferric sulfate.
Experiment 4: and (3) taking 1000ml and 5 parts of the polymer drilling fluid treated in the step (4) to form 1# -5# samples, wherein all initial parameters of all the samples are consistent, adding different amounts of the flocculant into each part of the drilling fluid, fully stirring and reacting, standing for a certain time, and testing the precipitation volume of the supernatant.
The experimental result shows that the addition of the flocculating agent is 0.2%, and the precipitation volume of the clear liquid is maximum when the standing time is 2 hours. The addition of the flocculant is increased, and the clear liquid precipitation system is reduced on the contrary because the excessive flocculant flocculates part of water while flocculating the inferior solid phase, so that the precipitation rate of the clear liquid is reduced on the contrary.
Example 5
On the basis of example 4, the more preferred embodiment of the invention is: and (3) placing the supernatant fluid treated in the step (5) into a circulating tank, further carrying out solid-liquid separation on the residual polymer drilling fluid in a settling tank through a pressure filter, transferring the separated liquid phase into a clear fluid circulating tank, and scrapping the solid phase. After the treatment of the steps, the solid-liquid separation rate of the polymer drilling fluid can reach 85% (namely the separated liquid phase accounts for 85% of the total amount of the polymer drilling fluid).
Example 6
On the basis of example 5, a more preferred embodiment of the invention is:
the separated liquid phase is mixed with 20 percent (weight ratio of the separated liquid phase) of clear water, and the drilling fluid can be recycled and prepared.
Experiment 5: and mixing the separated liquid phase with clear water according to different proportions to serve as a base fluid for preparing the drilling fluid, wherein the prepared drilling fluid has the following properties.
The experimental result shows that when 80% of separation liquid phase and 20% of clear water are mixed to prepare the drilling fluid, all basic performance indexes meet the design requirement.
Claims (8)
1. A method for treating and recycling waste polymer drilling fluid is characterized by comprising the following steps:
step 1: adding 5% of inhibitor A and 3% of inhibitor B into the polymer drilling fluid by mass ratio, pretreating the polymer drilling fluid, and then performing subsequent treatment; the inhibitor A is one of potassium chloride, potassium formate and sodium chloride; the inhibitor B is one of calcium chloride, calcium acetate and calcium bromide.
2. The method for treating and recycling the waste polymer drilling fluid according to claim 1, wherein the method comprises the following steps: the subsequent treatment comprises the following steps:
step 2: during the drilling process of the drilling fluid on the surface layer, the combination of solid phase control equipment is used: a 200-mesh vibrating screen, a 240-mesh desanding and desliming device and a 3000-turn high-speed centrifuge;
and step 3: and (3) storing the polymer drilling fluid after drilling the surface layer in a sedimentation tank, adding 0.05% of quicklime by mass of the polymer drilling fluid for treatment, and standing for 1 h.
3. The method for treating and recycling the waste polymer drilling fluid according to claim 2, wherein the method comprises the following steps: and 4, step 4: and (3) placing the supernatant fluid treated in the step (3) into a circulating tank, and continuously adding 0.1% of a gel breaker into a settling pond according to the mass ratio of the polymer drilling fluid treated in the step (3).
4. The method for treating and recycling the waste polymer drilling fluid according to claim 3, wherein the method comprises the following steps: and 5: and (4) continuously adding 0.2% of flocculating agent into the sedimentation tank according to the mass ratio of the polymer drilling fluid treated in the step (4), and standing for 2 hours.
5. The method for treating and recycling the waste polymer drilling fluid according to claim 4, wherein the method comprises the following steps: step 6: and (3) placing the supernatant fluid treated in the step (5) into a circulating tank, further carrying out solid-liquid separation on the residual polymer drilling fluid in a settling tank through a pressure filter, transferring the separated liquid phase into a clear fluid circulating tank, and scrapping the solid phase.
6. The method for treating and recycling the waste polymer drilling fluid according to claim 5, wherein the method comprises the following steps: and 7: after the treatment of the steps, 20 percent of clean water is mixed into the separated liquid phase according to the weight ratio, and the drilling fluid can be recycled and prepared.
7. The method for treating and recycling the waste polymer drilling fluid according to claim 4, wherein the method comprises the following steps: the flocculating agent is one of polyaluminium chloride, cationic polyacrylamide and polyferric sulfate.
8. The method for treating and recycling the waste polymer drilling fluid according to claim 3, wherein the method comprises the following steps: the gel breaker is one of ammonium persulfate, sodium hypochlorite and aluminum sulfate.
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| CN202010585365.0A CN111847705A (en) | 2020-06-24 | 2020-06-24 | Waste polymer drilling fluid treatment and recycling method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113683170A (en) * | 2021-09-24 | 2021-11-23 | 中国海洋石油集团有限公司 | Composite destabilization flocculating agent for high-altitude bentonite-containing waste drilling fluid |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113683170B (en) * | 2021-09-24 | 2023-06-20 | 中国海洋石油集团有限公司 | Composite destabilizing flocculant for offshore high bentonite-containing waste drilling fluid |
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Application publication date: 20201030 |