CN111777999B - Liquid flocculant for drilling fluid and preparation method thereof - Google Patents
Liquid flocculant for drilling fluid and preparation method thereof Download PDFInfo
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- C09K8/02—Well-drilling compositions
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Abstract
The invention provides a liquid flocculant for drilling fluid and a preparation method thereof, wherein the liquid flocculant comprises the following components in parts by weight: 25 to 50 portions of monomer, 8 to 15 portions of emulsifier, 100 to 150 portions of organic solvent, 0.05 to 0.4 portion of initiator and 50 to 75 portions of deionized water. The method comprises the following steps: s1, preparing a water phase; s2, preparing an oil phase; s3, dropping the water phase of the S1 into the oil phase of the S2, and introducing nitrogen under certain stirring conditions to prepare an emulsification system; and S4, adding an initiator into the emulsification system prepared in the S4, continuously introducing nitrogen, and uniformly stirring under a certain reaction condition to prepare the liquid flocculant for the drilling fluid. The liquid flocculant is in a latex shape, can be directly used, is simple and convenient, is more easily dissolved than a powdery product, has high utilization rate and greatly reduces the use cost; and an acrylamide monomer is not introduced into the liquid flocculant, and the problem of residual toxicity of the monomer does not exist, so that the liquid flocculant does not cause harm and pollution to people and the environment.
Description
Technical Field
The invention belongs to the technical field of oilfield chemical drilling fluid treating agents, and particularly relates to a liquid flocculant for drilling fluid and a preparation method thereof.
Background
In the drilling process, the shale in the stratum is easy to hydrate and disperse after being soaked by the drilling fluid, the slurry making phenomenon is prominent, the solid phase content in the drilling fluid is increased, the rheological property is poor, and meanwhile, the inferior solid phase is easy to be adsorbed on the surface of a drill bit to cause the mud pocket of the drill bit, thereby influencing the drilling operation construction.
At present, the commonly used flocculating agent in domestic drilling fluid is mainly partially hydrolyzed polyacrylamide and is a powder flocculating agent, although the transportation is convenient, the dissolution speed is slow, undissolved products can block equipment or be screened out from a vibrating screen, and the difficulty and the cost increase are brought to practical application; meanwhile, polyacrylamide has the problem of monomer residue toxicity, is not beneficial to human health and can cause pollution to the environment. With the enhancement of the environmental protection requirement, the development of more flocculants with strong applicability and small environmental pollution is also beneficial to the development of the oil and gas industry.
Because the drilling fluid is generally anionic, the adoption of the cationic flocculant is high in flocculation efficiency, but the performance of the whole drilling fluid is easy to be unstable, the maintenance cost is high, and the further popularization is not facilitated. Therefore, it is necessary to develop a novel liquid flocculant to meet the field requirements.
Disclosure of Invention
The invention provides a liquid flocculant for drilling fluid and a preparation method thereof, aiming at solving the problems that the existing flocculant is poor in residual toxicity and water solubility of acrylamide monomers and incompatible with a drilling fluid system.
The technical scheme adopted by the invention is as follows:
a liquid flocculant for drilling fluid at least comprises the following components in parts by weight: 25 to 50 portions of monomer, 8 to 15 portions of emulsifier, 100 to 150 portions of organic solvent, 0.05 to 0.4 portion of initiator and 50 to 75 portions of deionized water.
Further, the monomer comprises the following components in percentage by mass: 50-80% of olefinic acids, 10-30% of salicylic acids and 10-25% of sulfonic acids.
Further, the olefinic acid is one of acrylic acid, butenoic acid or 4-pentenoic acid;
further, the salicylic acid is one of 4-methacrylamidosalicylic acid or 5-acrylamido salicylic acid;
further, the sulfonic acid is one of 2-acrylamido-2-methylpropanesulfonic acid, 2-acryloyloxy-2-methylpropanesulfonic acid, or 2-acryloyloxyethanesulfonic acid.
The monomer preferably comprises the following components in percentage by mass: 50-80% of acrylic acid, 10-30% of 4-methacrylamide salicylic acid and 10-25% of 2-acrylamide-2-methylpropanesulfonic acid.
Further, the emulsifier is Span series surfactant and Tween series surfactant according to the mass ratio (6-8): 1 in proportion; the Span series surfactant is preferably one of Span60 and Span 80; the Tween series surfactant is preferably one of Tween60 and Tween 80.
The organic solvent is one of white oil, isoparaffin or cyclohexane;
the initiator is one of sodium persulfate, potassium persulfate or ammonium persulfate.
Further, the mass of the deionized water is M Water (W) Mass of monomer M Sheet Mass of organic solvent is M Is provided with The mass of the emulsifier is M Milk Mass M of said deionized water Water (W) Mass M of monomer Sheet Mass M of organic solvent Is provided with And mass M of the emulsifier Milk The following proportional relationship exists:
M water (W) ：M Sheet ＝(50～75)：(25～50)；
M Is provided with ：(M Water (W) +M Sheet )＝(2～3)：2；
M Milk ：(M Is provided with +M Water (W) +M Sheet )＝(0.06～0.1)：1。
A preparation method of a liquid flocculant for drilling fluid comprises the following steps:
s1, preparing a water phase;
s2, preparing an oil phase;
s3, dripping the prepared water phase of the S1 into the oil phase prepared by the S2, and introducing nitrogen under certain stirring conditions to prepare an emulsification system;
and S4, adding an initiator into the emulsification system prepared in the S4, continuously introducing nitrogen, and uniformly stirring under a certain reaction condition to prepare the liquid flocculant for the drilling fluid.
Further, the preparation of the water phase by the S1 comprises the steps of preparing raw materials and a preparation method, and specifically comprises the following steps:
(1) Preparing raw materials, which comprises the following components in parts by weight:
50-75 parts of deionized water,
25-50 parts of a monomer;
wherein the monomer comprises the following components in percentage by mass: 50-80% of olefinic acids, 10-30% of salicylic acids and 10-25% of sulfonic acids;
the preparation method comprises the following steps:
weighing the olefinic acids, the salicylic acids, the sulfonic acids and the deionized water according to the proportion, adding into a container, then introducing inert gas, adding alkali liquor into an ice water bath while stirring, and adjusting the pH value of the solution to 7-8 to obtain a water phase.
Further, the alkali liquor is one or a mixture of more than two of sodium hydroxide aqueous solution, potassium hydroxide aqueous solution, sodium carbonate aqueous solution, sodium bicarbonate aqueous solution, potassium carbonate aqueous solution and ammonia water, and the mass concentration percentage is 20-40%.
Specifically, in the water phase preparation method, the temperature of an ice water bath is 0-3 ℃, the stirring speed is 200-300 r/min, and the stirring time is 20-30 min.
Further, the method for preparing the oil phase by the S2 comprises the following steps: dissolving the emulsifier with the formula amount in an organic solvent, introducing nitrogen, and stirring for 20-30 minutes at the rotating speed of 200-300 revolutions per minute to obtain the oil phase.
Specifically, the dripping speed of the aqueous phase into the oil phase in the S3 is 10ml/min; the stirring speed is 500-1000 r/min and the stirring time is 30-60 min.
Specifically, the certain reaction conditions in S4 include a stirring speed of 200 to 300 rpm, a stirring time of 6 to 20 hours, and a reaction temperature of 50 to 70 ℃.
The reaction mechanism of the invention is as follows:
the raw materials used in the invention are realized by inverse emulsion polymerization, namely, a nonpolar solvent is taken as a continuous phase, a monomer is firstly dissolved in water to form a monomer water solution, then the monomer water solution is dispersed in an oil phase by means of an emulsifier with a low HLB value to form a water-in-oil type emulsion, and then the polymerization reaction is initiated by an initiator to form the water-in-oil type polymer latex.
The invention has the following beneficial effects:
1. the liquid flocculant prepared by the invention is latex-shaped, can be directly used, is simple and convenient, is more easily dissolved than a powdery product, has high utilization rate and greatly reduces the use cost.
2. Acrylamide monomers are not introduced into the liquid flocculant, and the problem of monomer residual toxicity is solved, so that the liquid flocculant cannot cause harm and pollution to people and the environment.
3. The anionic flocculant with negative charges synthesized by the acrylate, sulfonate and salicylate anion monomers introduced by the invention has good compatibility with a conventional drilling fluid system and is simple to maintain.
The foregoing is a summary of the present invention, and in order to provide a clear understanding of the technical means of the present invention and to be implemented in accordance with the present specification, preferred embodiments of the present invention are described in detail below.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
This invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, which are provided for a complete and complete disclosure of the invention and to fully convey the scope of the invention to those skilled in the art.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
The invention provides a liquid flocculant for drilling fluid, which comprises the following components in parts by weight: 25 to 50 portions of monomer, 8 to 15 portions of emulsifier, 100 to 150 portions of organic solvent, 0.05 to 0.4 portion of initiator and 50 to 75 portions of deionized water.
Further, the monomer comprises the following components in percentage by mass: 50-80% of olefinic acids, 10-30% of salicylic acids and 10-25% of sulfonic acids.
Further, the olefinic acid is one of acrylic acid, butenoic acid or 4-pentenoic acid;
further, the salicylic acid is one of 4-methacrylamidosalicylic acid or 5-acrylamido salicylic acid;
further, the sulfonic acid is one of 2-acrylamido-2-methylpropanesulfonic acid, 2-acryloyloxy-2-methylpropanesulfonic acid, or 2-acryloyloxyethanesulfonic acid.
The monomer preferably comprises the following components in percentage by mass: 50-80% of acrylic acid, 10-30% of 4-methacrylamide salicylic acid and 10-25% of 2-acrylamide-2-methylpropanesulfonic acid.
Further, the emulsifier is Span series surfactant and Tween series surfactant according to the mass ratio (6-8): 1 in proportion; the Span series surfactant is preferably one of Span60 and Span 80; the Tween series surfactant is preferably one of Tween60 and Tween 80.
The organic solvent is one of white oil, isoparaffin or cyclohexane;
the initiator is one of sodium persulfate, potassium persulfate or ammonium persulfate.
Further, the mass of the deionized water is M Water (W) Mass of monomer M Sheet Mass of organic solvent is M Is provided with The mass of the emulsifier is M Milk Mass M of said deionized water Water (W) Mass M of monomer Sheet Mass M of organic solvent Is provided with And mass M of emulsifier Milk The following proportional relationship exists:
M water (W) ：M Sheet ＝(50～75)：(25～50)；
M Is provided with ：(M Water (W) +M Sheet )＝(2～3)：2；
M Milk ：(M Is provided with +M Water (W) +M Sheet )＝(0.06～0.1)：1。
The invention also provides a preparation method of the liquid flocculant for the drilling fluid, which comprises the following steps:
s1, preparing a water phase;
s2, preparing an oil phase;
s3, dripping the prepared water phase of the S1 into the oil phase prepared by the S2, and introducing nitrogen under certain stirring conditions to prepare an emulsification system;
and S4, adding an initiator into the emulsification system prepared in the S4, continuously introducing nitrogen, and uniformly stirring under a certain reaction condition to prepare the liquid flocculant for the drilling fluid.
Further, the preparation of the water phase by the S1 comprises the steps of preparing raw materials and a preparation method, and specifically comprises the following steps:
(1) Preparing raw materials, which comprises the following components in parts by weight:
50-75 parts of deionized water,
25-50 parts of a monomer;
wherein the monomer comprises the following components in percentage by mass: 50-80% of olefine acids, 10-30% of salicylic acids and 10-25% of sulfonic acids;
the preparation method comprises the following steps:
weighing the olefinic acids, the salicylic acids, the sulfonic acids and the deionized water according to the proportion, adding into a container, introducing inert gas, adding alkali liquor in an ice water bath while stirring, and adjusting the pH value of the solution to 7-8 to obtain a water phase.
Further, the alkali liquor is one or a mixture of more than two of sodium hydroxide aqueous solution, potassium hydroxide aqueous solution, sodium carbonate aqueous solution, sodium bicarbonate aqueous solution, potassium carbonate aqueous solution and ammonia water, and the mass concentration percentage is 20-40%.
Specifically, in the water phase preparation method, the temperature of an ice water bath is 0-3 ℃, the stirring speed is 200-300 r/min, and the stirring time is 20-30 min.
Further, the oil phase preparation method of S2 comprises the following steps: dissolving the emulsifier with the formula amount in an organic solvent, introducing nitrogen, and stirring at the rotating speed of 200-300 revolutions per minute for 20-30 minutes to obtain the oil phase.
Specifically, the dripping speed of the aqueous phase into the oil phase in the S3 is 10ml/min; the stirring speed is 500-1000 r/min and the stirring time is 30-60 min.
Specifically, the certain reaction conditions in S4 include a stirring speed of 200 to 300 rpm, a stirring time of 6 to 20 hours, and a reaction temperature of 50 to 70 ℃.
Example 1
The embodiment provides a liquid flocculant for drilling fluid, which at least comprises the following components: 20g of monomer, 5.6g of Span60,0.9g of Twen80, 40g of white oil, 0.04g of sodium persulfate and 20g of deionized water.
Further, the monomer consisted of 10g of acrylic acid, 6g of 4-methacrylamidosilic acid and 4g of 2-acrylamido-2-methylpropanesulfonic Acid (AMPS).
The embodiment also provides a preparation method of the liquid flocculant for drilling fluid, which comprises the following steps:
s1, weighing 10g of acrylic acid, 6g of 4-methacrylamide salicylic acid and 4g of 2-acrylamide-2-methylpropanesulfonic Acid (AMPS) for later use;
s2, sequentially adding acrylic acid, 4-methacrylamidosalicylic acid, 2-acrylamido-2-methylpropanesulfonic Acid (AMPS) and 20g of deionized water into a four-opening beaker provided with a stirring device, a thermometer device and a feeding device, introducing nitrogen, adding a 40% sodium hydroxide aqueous solution in an ice water bath at a rotating speed of 200 revolutions per minute while stirring to ensure that the final pH value is 7 (the system temperature is not more than 30 ℃ in the neutralization process), and preparing a water phase; stirring for 20 minutes;
s3, weighing 5.6g of Span60 and 0.9g of Tween80, dissolving in 40g of white oil, introducing nitrogen, and stirring for 30 minutes at the rotating speed of 300 revolutions per minute to prepare an oil phase;
s4, slowly dropping the water phase prepared in the step S2 into the oil phase prepared in the step S3, introducing nitrogen, and stirring for 30 minutes at the rotating speed of 1000 revolutions per minute to prepare an emulsifying system;
s5, adding 0.04g of sodium persulfate into the emulsification system prepared in the step S4, continuously introducing nitrogen, and stirring at the reaction temperature of 50 ℃ for 6 hours at the rotating speed of 300 revolutions per minute to prepare the liquid flocculant.
Example 2:
the embodiment provides a liquid flocculant for drilling fluid, which at least comprises the following components: 20g of monomer, 17.6g of Span80,2.2g of Twen 80, 120g of isoalkane, 0.16g of ammonium persulfate and 60g of deionized water.
Further, the monomer consisted of 16g of crotonic acid, 2g of 5-acrylamidosalicylic acid and 2g of 2-acryloxy-2-methylpropanesulfonic acid.
The embodiment also provides a preparation method of the liquid flocculant for the drilling fluid, which comprises the following steps:
s1, weighing 16g of butenoic acid, 2g of 5-acrylamido salicylic acid and 2g of 2-acryloyloxy-2-methylpropanesulfonic acid for later use;
s2, sequentially adding crotonic acid, 5-acrylamido salicylic acid, 2-acryloyloxy-2-methylpropanesulfonic acid and deionized water into a four-opening beaker provided with a stirring device, a thermometer device and a feeding device, introducing nitrogen, stirring and adding 20% ammonia water solution at the rotating speed of 300 revolutions per minute in an ice water bath to ensure that the final pH value is 8 (the temperature of a system is kept not more than 30 ℃ in the neutralization process), and preparing a water phase; the stirring time is 30 minutes;
s3, weighing 17.6g of Span80 and 2.2g of Tween80, dissolving in 120g of isoparaffin, introducing nitrogen, and stirring at the rotating speed of 300 revolutions per minute for 20 minutes to prepare an oil phase;
s4, slowly dripping the water phase prepared in the step S2 into the oil phase prepared in the step S3, introducing nitrogen, and stirring at the rotating speed of 500 revolutions per minute for 60 minutes to prepare an emulsifying system;
s5, adding 0.16g of ammonium persulfate into the emulsification system prepared in the step S4, continuously introducing nitrogen, and stirring at the reaction temperature of 70 ℃ for 20 hours at the rotating speed of 200 revolutions per minute to prepare the liquid flocculant.
Example 3
The embodiment provides a liquid flocculant for drilling fluid, which at least comprises the following components: 20g of monomer, 8.4g of Span60,1.2g of Tweenen 60, 60g of cyclohexane, 0.10g of potassium persulfate and 30g of deionized water.
Further, the monomer consisted of 12g of 4-pentenoic acid, 4g of 4-methacrylamidosalicylic acid and 4g of 2-acryloyloxyethanesulfonic acid.
The embodiment also provides a preparation method of the liquid flocculant for drilling fluid, which comprises the following steps:
s1.12g of 4-pentenoic acid, 4g of 4-methacrylamide salicylic acid and 4g of 2-acryloyloxyethanesulfonic acid for standby;
s2, sequentially adding 4-pentenoic acid, 4-methacrylamidosalicylic acid, 2-acryloxyethanesulfonic acid and deionized water into a four-opening beaker provided with a stirring device, a thermometer device and a feeding device, introducing nitrogen, adding 40% potassium hydroxide aqueous solution into the beaker in an ice water bath at the speed of 200 revolutions per minute while stirring to ensure that the final pH value is 7.5 (the temperature of a system is kept to be not more than 30 ℃ in the neutralization process), and preparing a water phase; the stirring time is 20 minutes;
s3, weighing 8.4g of Span60 and 1.2g of Tween60, dissolving in 60g of cyclohexane, introducing nitrogen, and stirring for 30 minutes at the rotating speed of 300 revolutions per minute to prepare an oil phase;
s4, slowly dripping the water phase prepared in the step S2 into the oil phase prepared in the step S3, introducing nitrogen, and stirring for 50 minutes at the rotating speed of 800 revolutions per minute to prepare an emulsifying system;
s5, adding 0.10g of potassium persulfate into the emulsification system prepared in the step S4, continuously introducing nitrogen, and stirring at the reaction temperature of 60 ℃ at the rotating speed of 300 revolutions per minute for 12 hours to prepare the liquid flocculant.
The products of the above examples were tested for performance.
Test 1: examples 1-3 drilling fluids were tested for intrinsic viscosity using liquid flocculants. The measurement was carried out according to the GB/T12005.1. The test results are shown in table 1 below:
table 1 examples 1-3 intrinsic viscosity results for liquid flocculants for drilling fluids
| Sample (I) | Intrinsic viscosity, dL/g |
| Example 1 | 10.63 |
| Example 2 | 11.88 |
| Example 3 | 9.57 |
And (3) testing 2: examples 1-3 the drilling fluids were tested for flocculation time using a liquid flocculant. The measurements were carried out according to the standard "SY/T5233-2014 flocculant evaluation procedure for drilling fluids" regulations. The test results are shown in table 2 below.
Table 2 examples 1-3 flocculation time results for liquid flocculants for drilling fluids
| Sample(s) | Flocculation time, s |
| Example 1 | 242 |
| Example 2 | 216 |
| Examples3 | 328 |
And (3) testing: the compatibility of the liquid flocculant for drilling fluid of examples 1 to 3 with drilling fluid was evaluated. The formula of the drilling fluid is as follows: water, 0.2 percent of caustic soda, 2 percent of bentonite, 8 percent of potassium chloride, 0.3 percent of viscosity-increasing and cutting-extracting agent XCD, 0.1 percent of viscosity-increasing agent PAC-H, 0.3 percent of fluid loss agent PAC-L and 10 percent of barite, and the density of the drilling fluid is 1.10g/cm 3 And the drilling fluid is thermally rolled for 16h at the aging condition of 95 ℃.
The compatibility of the liquid flocculant for drilling fluid of examples 1 to 3 of the present invention with drilling fluid was evaluated. And (3) testing conditions: the addition of the liquid flocculant in the drilling fluid is 1 percent; the drilling fluid properties of the base slurry and the experimental slurries of examples 1-3 were determined and the results are shown in table 3.
Table 3 examples 1 to 3 results of testing compatibility of liquid flocculant for drilling fluid and drilling fluid
The test results in the table show that the influence on the drilling fluid water loss and the pH value is small after the liquid flocculant for the drilling fluid is added, and the plastic viscosity and the shear force are slightly increased. The compatibility of the liquid flocculant for drilling fluid in the drilling fluid is proved to be good under the condition of 1 percent addition.
And (4) testing: evaluation examples 1 to 3 were used for the analysis of the toxicity of the drilling fluid and the experiment of biodegradability (according to the method for evaluating the environmental protection technology of a water-soluble oilfield chemical agent by SY/T6788-2010). The results of the evaluation tests are shown in table 4 below.
Table 4 examples 1 to 3 evaluation results of environmental protection properties of liquid flocculants for drilling fluids in drilling fluids
| Sample (I) | EC 50 ，mg/l | BOD/COD Cr |
| Base stock +1% example 1 | 61600 | 0.2608 |
| Base stock +1% example 2 | 55400 | 0.1946 |
| Base stock +1% example 3 | 72900 | 0.2251 |
| SYT6787-2010 | >20000 | ≥0.05 |
As can be seen from the data in Table 4, the drilling fluid EC is obtained after the liquid flocculant is added 50 All values are greater than 10 5 mg/l，BOD/COD Cr The values are all larger than 0.05, which proves that the drilling fluid added with the liquid flocculant is non-toxic, easy to degrade and excellent in environmental protection performance.
In conclusion, the liquid flocculant is in a latex shape, can be directly used, is simple and convenient, is easier to dissolve than a powdery product, has high utilization rate and greatly reduces the use cost. Meanwhile, the liquid flocculant has the advantages of good water solubility, no residual toxicity of acrylamide monomers, good compatibility with drilling fluid and the like.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.
Claims (8)
1. A preparation method of a liquid flocculant for drilling fluid is characterized by comprising the following steps:
s1, preparing a water phase, comprising preparing raw materials and a preparation method,
(1) Preparing raw materials, which comprises the following components in parts by weight:
50 to 75 portions of deionized water,
25-50 parts of a monomer;
wherein the monomer comprises the following components in percentage by mass: 50-80% of olefinic acids, 10-30% of salicylic acids and 10-25% of sulfonic acids;
the acrylic acid is one of acrylic acid, butenoic acid or 4-pentenoic acid;
the salicylic acid is one of 4-methylacrylamidosalicylic acid or 5-acrylamidosalicylic acid;
the sulfonic acid is one of 2-acrylamide-2-methylpropanesulfonic acid, 2-acryloxy-2-methylpropanesulfonic acid or 2-acryloxy ethanesulfonic acid;
(2) The preparation method comprises the following steps:
weighing the olefinic acids, the salicylic acids, the sulfonic acids and the deionized water according to the proportion, adding into a container, then introducing inert gas, adding alkali liquor into an ice water bath while stirring, and adjusting the pH value of the solution to 7-8 to obtain a water phase;
s2, preparing an oil phase;
the preparation method comprises the following steps: dissolving the emulsifier with the formula amount in an organic solvent, introducing nitrogen, and stirring for 20-30 minutes at the rotating speed of 200-300 revolutions per minute to obtain an oil phase;
the emulsifier is prepared from Span series surfactant and Tween series surfactant according to the mass ratio of (6-8): 1 in proportion;
s3, dripping the prepared water phase of the S1 into the oil phase prepared by the S2, and introducing nitrogen under certain stirring conditions to prepare an emulsification system;
and S4, adding an initiator into the emulsifying system prepared in the step S4, continuously introducing nitrogen and uniformly stirring under certain reaction conditions to prepare the liquid flocculant for the drilling fluid.
2. The preparation method of the liquid flocculant for the drilling fluid, according to claim 1, is characterized in that: the alkali liquor is one or a mixture of more than two of sodium hydroxide aqueous solution, potassium hydroxide aqueous solution, sodium carbonate aqueous solution, sodium bicarbonate aqueous solution, potassium carbonate aqueous solution and ammonia water, and the mass concentration percentage is 20-40%.
3. The preparation method of the liquid flocculant for the drilling fluid, according to claim 1, is characterized in that: the organic solvent is one of white oil, isoparaffin or cyclohexane;
the initiator is one of sodium persulfate, potassium persulfate or ammonium persulfate.
4. The preparation method of the liquid flocculant for the drilling fluid, according to claim 1, is characterized in that: in the water phase preparation method, the temperature of an ice water bath is 0-3 ℃, the stirring speed is 200-300 r/min, and the stirring time is 20-30 min.
5. The preparation method of the liquid flocculant for the drilling fluid, according to claim 1, is characterized in that: the dropping speed of the aqueous phase into the oil phase in the S3 is 10ml/min; the certain stirring condition means that the stirring speed is 500-1000 r/min, and the stirring time is 30-60 min;
the certain reaction conditions in S4 are that the stirring speed is 200-300 r/min, the stirring time is 6-20 hours, and the reaction temperature is 50-70 ℃.
6. The liquid flocculant for the drilling fluid is characterized by at least comprising the following components in parts by weight: 25-50 parts of monomer, 8-15 parts of emulsifier, 100-150 parts of organic solvent, 0.05-0.4 part of initiator and 50-75 parts of deionized water;
the monomer comprises the following components in percentage by mass: 50-80% of olefine acids, 10-30% of salicylic acids and 10-25% of sulfonic acids;
the acrylic acid is one of acrylic acid, butenoic acid or 4-pentenoic acid;
the salicylic acid is one of 4-methylacrylamidosalicylic acid or 5-acrylamidosalicylic acid;
the sulfonic acid is one of 2-acrylamide-2-methylpropanesulfonic acid, 2-acryloxy-2-methylpropanesulfonic acid or 2-acryloxy ethanesulfonic acid.
7. The liquid flocculant for drilling fluid according to claim 6, wherein:
the emulsifier is prepared from Span series surfactant and Tween series surfactant according to the mass ratio of (6-8): 1 in proportion;
the organic solvent is one of white oil, isoparaffin or cyclohexane;
the initiator is one of sodium persulfate, potassium persulfate or ammonium persulfate.
8. The liquid flocculant for drilling fluid according to claim 6, wherein: the mass of the deionized water is M Water (I) Mass of monomer M Sheet Mass of organic solvent is M Is provided with The mass of the emulsifier is M Milk Mass M of the deionized water Water (W) Mass M of monomer Sheet Mass M of organic solvent Is provided with And mass M of the emulsifier Milk The following proportional relationship exists:
M water (W) ：M Sheet =（50～75）：（25～50）；
M Is provided with ：（M Water (W) +M Sheet ）=（2～3）：2；
M Milk ：（M Is provided with +M Water (I) +M Sheet ）=（0.06～0.1）：1。
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| CN202010722527.0A CN111777999B (en) | 2020-07-24 | 2020-07-24 | Liquid flocculant for drilling fluid and preparation method thereof |
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| CN111777999B true CN111777999B (en) | 2022-11-29 |
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| CN101845105A (en) * | 2010-05-18 | 2010-09-29 | 马云峰 | Synthetic method of inverse emulsion of polyacrylamide |
| CN109762093A (en) * | 2018-12-04 | 2019-05-17 | 中国石油天然气集团有限公司 | A kind of drilling fluid high molecular polymer flocculant and preparation method thereof |
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| CN101845105A (en) * | 2010-05-18 | 2010-09-29 | 马云峰 | Synthetic method of inverse emulsion of polyacrylamide |
| CN109762093A (en) * | 2018-12-04 | 2019-05-17 | 中国石油天然气集团有限公司 | A kind of drilling fluid high molecular polymer flocculant and preparation method thereof |
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| 一种钻井液用有机高分子絮凝剂的反相乳液法制备;韩玉贵等;《精细化工》;20041230;第21卷;38-40 * |
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