CN109468123B - Environment-friendly polymer micro-nano material for drilling fluid and preparation method thereof - Google Patents
Environment-friendly polymer micro-nano material for drilling fluid and preparation method thereof Download PDFInfo
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Abstract
The invention discloses an environment-friendly polymer micro-nano material for drilling fluid and a preparation method thereof. The polymer micro-nano material for the drilling fluid has good water loss control and plugging capability, good biodegradability and excellent environmental protection performance; the environment-friendly polymer micro-nano material can replace clay in the drilling fluid to form the drilling fluid which is beneficial to solid-liquid separation, so that the later-stage waste treatment is simple under the condition of meeting the requirement of conventional drilling operation, and the environment-friendly problems of the drilling fluid such as discharge, waste treatment and the like can be effectively solved.
Description
Technical Field
The invention belongs to the field of petroleum, and relates to an environment-friendly polymer micro-nano material for drilling fluid and a preparation method thereof.
Background
With the rapid development of the world petroleum industry, the progress of modern environmental protection ideas and the development of environmental protection careers have made higher updating requirements on drilling technologies. In the oil and gas drilling process, the drilling fluid as a first well entering fluid plays a vital role in protecting a hydrocarbon reservoir. Meanwhile, the waste drilling fluid generated in the exploration and development process causes pollution to the surrounding ecological environment due to the fact that the waste drilling fluid contains various chemical treatment agents, brings inconvenience to subsequent operation, and easily causes adverse consequences such as environmental disputes and economic losses. Particularly, under the condition that the technical development of the drilling fluid is limited by environmental protection policies, laws and regulations, the research of a novel drilling fluid system meeting the requirements of drilling engineering technology and environmental protection is more necessary.
The treatment of the waste drilling fluid of oil and gas fields at home and abroad generally adopts solid-liquid separation firstly, and then respectively treats liquid and solid waste residues, but most of the waste water-based drilling fluid at the present stage is a dispersion system with extremely high stability, and the solid-liquid separation is difficult; after solid-liquid separation, due to the hydration of clay particles and the existence of bound water, the water content of the treated solid phase is over 80 percent, and the post treatment of the waste drilling fluid is seriously influenced.
Disclosure of Invention
The invention aims to provide an environment-friendly polymer micro-nano material for drilling fluid and a preparation method thereof.
The polymer micro-nano material for the drilling fluid is prepared from the following raw materials in parts by mass:
in the polymer micro-nano material for the drilling fluid, the inorganic nano particles are specifically selected from at least one of nano calcium carbonate, montmorillonite, nano silicon dioxide and nano titanium dioxide;
the particle size of the inorganic nano particles is 10-100 nm;
the surfactant is specifically selected from at least one of sodium dodecyl benzene sulfonate, lignosulfonate and fatty alcohol-polyoxyethylene ether sodium sulfate; the lignosulfonate is specifically sodium lignosulfonate;
the natural polymer is at least one selected from cellulose, lignin, starch and chitosan; the cellulose is polyanionic cellulose; the starch is corn starch;
the copolymerization monomer is specifically selected from at least one of Acrylic Acid (AA), Acrylamide (AM), methacrylamide (MAM) and hydroxyethyl methacrylate (HEMA);
the cross-linking agent is specifically selected from at least one of N, N-methylene bisacrylamide, divinylbenzene, diethylenone and glycerol;
the initiator is specifically selected from at least one of ammonium persulfate, sodium sulfite and sodium thiosulfate;
the water is specifically deionized water.
Specifically, the polymer micro-nano material for the drilling fluid is a polymer micro-nano material a for the drilling fluid, a polymer micro-nano material b for the drilling fluid or a polymer micro-nano material c for the drilling fluid;
the polymer micro-nano material a for the drilling fluid is prepared from the following raw materials in parts by mass:
the polymer micro-nano material b for the drilling fluid is prepared from the following raw materials in parts by mass:
the polymer micro-nano material c for the drilling fluid is prepared from the following raw materials in parts by mass:
the invention provides a method for preparing a polymer micro-nano material for drilling fluid, which comprises the following steps:
1) uniformly mixing inorganic nanoparticles, a surfactant, a copolymerization reaction monomer and 500 parts of 100-plus-one water according to the proportion of the polymer micro-nano material for the drilling fluid to obtain a nano dispersed suspension;
2) according to the proportion of the polymer micro-nano material for the drilling fluid, dissolving the natural polymer in 500 parts of water of 100, adjusting the pH value to 9-10, and then adding a cross-linking agent for a cross-linking reaction to obtain a natural polymer aqueous solution;
3) mixing the natural polymer aqueous solution and the nano dispersion suspension in an inert atmosphere, adding an initiator, heating to 60-100 ℃ (specifically 80 ℃) and reacting for 3-4 hours; and obtaining the polymer micro-nano material for the drilling fluid after the reaction is finished.
The method further comprises the steps of: after the reaction in the step 3) is finished, washing, drying and crushing a reaction product.
In the washing step, the detergent is ethanol;
in the drying step, the temperature is 70-90 ℃. C
In the step 2), the temperature is 50-120 ℃, specifically 80 ℃, and the time is 30-60min in the crosslinking reaction step;
in the step 3), the inert atmosphere is a nitrogen atmosphere.
In addition, the application of the polymer micro-nano material for the drilling fluid provided by the invention in drilling or preparing the drilling fluid also belongs to the protection scope of the invention. The method for drilling or preparing the drilling fluid comprises the following steps: adding the polymer micro-nano material for the drilling fluid into a drilling fluid base slurry;
the addition amount of the polymer micro-nano material for the drilling fluid is specifically 1-3 g: 100 ml.
The invention starts from the aspects of environmental protection and post treatment of the drilling fluid, and solves the problems of solid-liquid separation and environmental protection in waste treatment from the aspects of clay and easy degradation by researching and developing a polymer micro-nano material as a novel drilling fluid base material; under the condition of meeting the requirements of conventional drilling operation, the solid-liquid separation problem in the later-stage waste treatment of the drilling fluid is solved, and the environmental protection problems of the discharge, waste treatment and the like of the drilling fluid are effectively solved. The polymer micro-nano material for the drilling fluid provided by the invention has good water loss control and plugging capability, good biodegradability and excellent environmental protection performance; the environment-friendly polymer micro-nano material can replace clay in the drilling fluid to form the drilling fluid which is beneficial to solid-liquid separation, so that the later-stage waste treatment is simple under the condition of meeting the requirement of conventional drilling operation, and the environment-friendly problems of the drilling fluid such as discharge, waste treatment and the like can be effectively solved.
Detailed Description
The present invention will be further illustrated with reference to the following specific examples, but the present invention is not limited to the following examples. The method is a conventional method unless otherwise specified. The starting materials are commercially available from the open literature unless otherwise specified. In the examples below, polyanionic cellulose was used from Luzhou northern Qiaofeng chemical Co., Ltd; the corn starch used was purchased from Hebei Deri starch, Inc.
Examples 1,
The polymer micro-nano material a for the drilling fluid is prepared from the following raw materials in parts by mass:
nanometer silicon dioxide 60 with particle size of 10-100nm
1) Adding 60 parts of nano silicon dioxide, 0.01 part of sodium dodecyl benzene sulfonate, 300 parts of deionized water and 5 parts of acrylic acid monomer into a four-neck flask, and fully and uniformly stirring to form a nano dispersion suspension;
2) preparing solution from 30 parts of polyanionic cellulose and 300 parts of deionized water, adjusting the pH value of the solution to 9-10 by using sodium hydroxide solution, adding 0.2 part of N, N-methylene bisacrylamide, carrying out crosslinking reaction at 80 ℃ for 30min, and cooling to room temperature to form natural polymer aqueous solution;
3) adding a natural polymer aqueous solution into a four-neck flask, mixing with the nano dispersion suspension, stirring for 30min under the condition of introducing nitrogen, then adding 0.08 part of ammonium persulfate, and heating to 80 ℃ for reaction for 3-4 h; after the reaction is finished, washing the product with ethanol, drying the product at 70-90 ℃ to constant weight, and finally crushing the product to obtain the environment-friendly polymer micro-nano material provided by the invention.
Example 2
The polymer micro-nano material b for the drilling fluid is prepared from the following raw materials in parts by mass:
nanometer silicon dioxide 40 with particle size of 10-100nm
The preparation method is the same as that of the example 1, and only the raw materials and the using amount of the raw materials are replaced according to the list of the example 2.
Example 3
The polymer micro-nano material c for the drilling fluid is prepared from the following raw materials in parts by mass:
the preparation method is the same as that of example 1, and only the raw materials and the used amount thereof are replaced according to the list of example 3.
The environmental protection performance of the material is graded by a luminescent bacteria method of petroleum group standard Q/SY 111-2007 oil field chemical agent and drilling fluid biotoxicity grading and detecting method, a potassium dichromate determination method of GB11914-89 water quality chemical oxygen demand (CODcr), and a determination dilution and inoculation method of HJ 505-2009 water quality five-day biochemical oxygen demand (BOD5) in the prepared environment-friendly polymer micro-nano material reference in examples 1-3. The toxicity rating and degradability are specifically classified as shown in the following table:
TABLE 1 biotoxicity rating
| Biotoxicity rating | Luminescent bacterium EC50(mg/L) |
| High toxicity | ＜1 |
| Heavy toxicity | 1～100 |
| Poisoning by | 101～1000 |
| Slight toxicity | 1001～25000 |
| Is non-toxic | ＞25000 |
TABLE 2 biodegradability grades
Table 3, evaluation of environmental protection of polymer micro-nano material
| Numbering | Biotoxicity EC50 | Toxicity grading | Y＝BOD5/CODCr(％) | Degradability grading |
| 1 | 187720 | Is non-toxic | 23.6 | Is easier to degrade |
| 2 | 227412 | Is non-toxic | 26.7 | Is easy to degrade |
| 3 | 255540 | Is non-toxic | 28.3 | Is easy to degrade |
From the experimental conditions, the prepared environment-friendly polymer micro-nano material is a non-toxic material, has good biodegradability and is suitable for an environment-friendly drilling fluid system.
In the embodiments 1-3, the drilling fluid is prepared and the performance of the environment-friendly polymer micro-nano material is detected according to the following procedures, and the specific performance test refers to the GB/T16783.1-2006 petroleum and natural gas industry drilling fluid field test part 1: a water-based drilling fluid.
1. Drilling fluid preparation procedure
1) Adding 0.8g of sodium hydroxide into 400ml of fresh water in a high stirring cup, and stirring at a high speed for 5 min;
2) adding 8g of the environment-friendly polymer micro-nano material prepared in the embodiment under the high-speed stirring condition of 10000r/min, stirring for 20min,
3) adding 1.2g of polyanionic cellulose, 4g of carboxymethyl starch and 0.8g of xanthan gum under the condition of 10000r/min high-speed stirring, and stirring for 20 min;
4) under the condition of 10000r/min high-speed stirring, 100g of barite is added, and the mixture is stirred at a high speed for 20 min;
5) preparing 3 cups of base slurry according to the method, and marking as No. 1, No. 2 and No. 3 drilling fluids.
2. Comparative drilling fluid configuration procedure
1) Adding 8g of clay into 400ml of fresh water in a high stirring cup, and stirring at a low speed until the clay is completely dispersed;
2) adding 0.8g of sodium hydroxide, stirring at a high speed for 20min, and maintaining for 24 h;
3) stirring the maintained clay mixture at 10000r/min at a high speed for 10 min;
4) adding 1.2g of polyanionic cellulose, 4g of carboxymethyl starch and 0.8g of xanthan gum under the condition of 10000r/min high-speed stirring, and stirring for 20 min;
5) under the condition of 10000r/min high-speed stirring, 100g of barite is added, and the mixture is stirred at a high speed for 20 min;
6) 1 cup of drilling fluid is prepared according to the method and is marked as No. 4 drilling fluid (comparison sample).
3. Evaluation of drilling fluid Properties
The drilling fluid performance test is carried out according to the GB/T16783.1-2006 oil and gas industry drilling fluid field test part 1, namely water-based drilling fluid, and the obtained results are shown in a table 4.
TABLE 4 results of Performance evaluation
In comparison between the drilling fluid No. 3 prepared from the environment-friendly polymer micro-nano material prepared in the embodiment 3 and the drilling fluid No. 4 prepared from clay, the polymer micro-nano material has no influence on the conventional performance of the whole drilling fluid system after replacing clay, and has good rheological property and water loss control capability; after solid-liquid separation, the solid-phase water content of the drilling fluid No. 3 is 42.7%, and the solid-phase water content of the drilling fluid No. 4 is 62.5%, which shows that after the polymer micro-nano material replaces clay, the solid-liquid separation of the drilling fluid system becomes easy, and the later-stage waste treatment is facilitated. Therefore, the polymer micro-nano material prepared in the embodiment meets the design purpose requirement in the aspect of technology and environmental protection.
The present invention is not limited to the above-mentioned preferred embodiments, and any structural changes made under the teaching of the present invention shall fall within the protection scope of the present invention, which has the same or similar technical solutions as the present invention.
Claims (10)
1. A polymer micro-nano material for drilling fluid is prepared from the following raw materials in parts by mass:
inorganic nanoparticles 50-100
0.01-0.02% of surfactant
Natural polymer 20-50
5-20 parts of copolymerization reaction monomer
0.2-0.5 of cross-linking agent
Initiator 0.05-0.2
100 portions of water and 1000 portions of water;
the inorganic nano particles are selected from nano calcium carbonate or nano silicon dioxide;
the particle size of the inorganic nano particles is 10-100 nm;
the surfactant is sodium dodecyl benzene sulfonate;
the natural polymer is selected from polyanionic cellulose or corn starch;
the copolymerization monomer is selected from acrylic acid or acrylamide;
the cross-linking agent is selected from at least one of N, N-methylene-bisacrylamide, divinylbenzene, diethylenone and glycerol;
the initiator is selected from at least one of ammonium persulfate, sodium sulfite and sodium thiosulfate;
the water is deionized water.
2. The polymer micro-nano material for drilling fluid according to claim 1, wherein: the polymer micro-nano material for the drilling fluid is a polymer micro-nano material a for the drilling fluid or a polymer micro-nano material c for the drilling fluid;
the polymer micro-nano material a for the drilling fluid is prepared from the following raw materials in parts by mass:
inorganic nanoparticles 60
Surfactant 0.01
Natural polymer 30
Comonomer 5
Crosslinking agent 0.2
Initiator 0.08
Water 600;
the polymer micro-nano material c for the drilling fluid is prepared from the following raw materials in parts by mass:
inorganic nanoparticles 60
Surfactant 0.01
Natural polymer 50
Comonomer 15
Crosslinking agent 0.2
Initiator 0.1
And (6) water 600.
3. A polymer micro-nano material for drilling fluid is prepared from the following raw materials in parts by mass:
inorganic nanoparticles 40
Surfactant 0.01
Natural polymer 40
Comonomer 10
Crosslinking agent 0.3
Initiator 0.12
Water 600;
the inorganic nano particles are selected from nano calcium carbonate or nano silicon dioxide;
the particle size of the inorganic nano particles is 10-100 nm;
the surfactant is sodium dodecyl benzene sulfonate;
the natural polymer is selected from polyanionic cellulose or corn starch;
the copolymerization monomer is selected from acrylic acid or acrylamide;
the cross-linking agent is selected from at least one of N, N-methylene-bisacrylamide, divinylbenzene, diethylenone and glycerol;
the initiator is selected from at least one of ammonium persulfate, sodium sulfite and sodium thiosulfate;
the water is deionized water.
4. A method for preparing the polymer micro-nano material for the drilling fluid according to any one of claims 1 to 3, which comprises the following steps:
1) according to the proportion of the polymer micro-nano material for the drilling fluid in any one of the claims 1 to 3, uniformly mixing inorganic nanoparticles, a surfactant, a copolymerization reaction monomer and 500 parts of 100-500 parts of water to obtain a nano dispersion suspension;
2) according to the proportion of the polymer micro-nano material for the drilling fluid in any one of claims 1 to 3, dissolving the natural polymer in 500 parts of water, adjusting the pH value to 9 to 10, and then adding a cross-linking agent for a cross-linking reaction to obtain a natural polymer aqueous solution;
3) mixing the natural polymer aqueous solution and the nano dispersion suspension in an inert atmosphere, adding an initiator, heating to 60-100 ℃, and reacting for 3-4 h; and obtaining the polymer micro-nano material for the drilling fluid after the reaction is finished.
5. The method of claim 4, wherein: the method further comprises the steps of: after the reaction in the step 3) is finished, washing, drying and crushing a reaction product.
6. The method of claim 4, wherein: in the washing step, the detergent is ethanol;
in the drying step, the temperature is 70-90 ℃.
7. The method according to any one of claims 4-6, wherein: in the step 2), the temperature is 50-120 ℃ and the time is 30-60min in the crosslinking reaction step;
in the step 3), the inert atmosphere is a nitrogen atmosphere.
8. The method of claim 7, wherein: in the step 2), the temperature in the crosslinking reaction step is 80 ℃.
9. The application of the polymer micro-nano material for the drilling fluid in any one of claims 1 to 3 in the preparation of the drilling fluid.
10. Use according to claim 9, characterized in that: the method for preparing the drilling fluid comprises the following steps: adding the polymer micro-nano material for the drilling fluid into a drilling fluid base slurry;
the addition amount of the polymer micro-nano material for the drilling fluid is 1-3 g: 100 ml.
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| CN111115994B (en) * | 2020-01-16 | 2022-12-27 | 四川格英达环保科技有限公司 | Sulfonated mud drilling cutting harmless treatment dry coagulation powder and preparation method thereof |
| CN112266780B (en) * | 2020-10-13 | 2022-12-20 | 宁波锋成先进能源材料研究院有限公司 | Modified nano foam stabilizer and preparation method and application thereof |
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