CN110628055A - Preparation method of crosslinked modified polyacrylamide for drilling fluid - Google Patents
Preparation method of crosslinked modified polyacrylamide for drilling fluid Download PDFInfo
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- CN110628055A CN110628055A CN201910988703.2A CN201910988703A CN110628055A CN 110628055 A CN110628055 A CN 110628055A CN 201910988703 A CN201910988703 A CN 201910988703A CN 110628055 A CN110628055 A CN 110628055A
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- reaction kettle
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
- C09K8/035—Organic additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2333/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
- C08J2333/24—Homopolymers or copolymers of amides or imides
- C08J2333/26—Homopolymers or copolymers of acrylamide or methacrylamide
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
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Abstract
The invention provides a preparation method of cross-linked modified polyacrylamide for drilling fluid, which comprises the steps of adding a certain amount of tap water into a reaction kettle, adding a certain amount of hydrolyzed polyacrylamide according to the water amount, stirring at a low speed for 2 hours until the hydrolyzed polyacrylamide is completely dissolved, sequentially adding organic cross-linking agents J1 and J2 into the reaction kettle, adding a certain amount of concentrated hydrochloric acid into the reaction kettle after continuous stirring, adjusting the pH of the solution to be 4.5 ~ 7.0.0, controlling the temperature of the solution in the reaction kettle to reach 50 ~ 80 ℃, stopping stirring, slowly reacting the materials in the reaction kettle for 10 ~ 16 hours, opening a bottom valve of the reaction kettle, enabling the discharged materials to be in a jelly shape, enabling the color of the materials to be light pink, and completing the cross-linking reaction.
Description
Technical Field
The invention relates to the field of drilling fluid, in particular to a preparation method of cross-linked modified polyacrylamide for drilling fluid.
Background
The use of polyacrylamide in drilling fluids has been in china for half a century. In the past, the flocculating and coating effect of polyacrylamide on bentonite is used to control the hydration, dispersion and slurry making of the bentonite in the drilling fluid so as to improve the drilling speed. It is needless to say that polyacrylamide achieves an effect that cannot be replaced by other treatment agents. Of course, social and economic benefits are also noticeable.
However, with the continuous development of new drilling technology, new requirements on the performance of the drilling fluid are also put forward. For example, high pressure jet drilling requires drilling fluid solids to be controlled below 4%, i.e., there is little, if any, available solids (bentonite) in the drilling fluid. Thus, the once used non-hydrolyzed polyacrylamides must be chemically modified to provide both flocculation and coalescence and some suspension of the bentonite. This places numerous modification requirements on the polyacrylamide. Such as: partially hydrolyzed polyacrylamides, anionic polyacrylamides, cationic polyacrylamides, zwitterionic polyacrylamides, and the like, have been developed. The modified polyacrylamide has expected effects in the drilling fluid and is a product widely used in the current drilling fluid.
None of these modified polyacrylamides chemically modifies polyacrylamide, modifying the spatial configuration of polyacrylamide. It is known that the chemical nature of a substance plays a crucial role in its use. It is also undeniable that the spatial configuration of the substance plays an irreplaceable role for its use in industrial and agricultural production. This is two different approaches in order to give the material better properties. For example, the high-quality wood (red wood, sandalwood, oak) is used as the beam sandalwood for covering houses, and the beam sandalwood can bear heavier pressure than the inferior wood (poplar, willow). However, the same wood material can change its spatial configuration to be triangular, quadrangular, etc., and also play an immeasurable role in bearing load. Sometimes, the pressure to which the shape is changed is still greater.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provide a preparation method of crosslinking modified polyacrylamide for drilling fluid.
The new technical scheme of the invention is as follows: a preparation method of crosslinked modified polyacrylamide for drilling fluid comprises the following steps:
step 1: adding a certain amount of tap water into a chemical reaction kettle, adding a certain amount of hydrolyzed polyacrylamide according to the water amount in the chemical reaction kettle, stirring at a low speed for 2 hours, and completely dissolving the hydrolyzed polyacrylamide, namely, completely dissolving the hydrolyzed polyacrylamide blocks in the chemical reaction kettle;
step 2, sequentially adding 0.2 ~ 0.7.7 percent of organic cross-linking agent J1 and 0.5-1.2 percent of organic cross-linking agent J2 into the reaction kettle according to the water amount in the chemical reaction kettle;
step 3, continuing stirring, adding a certain amount of concentrated hydrochloric acid into the chemical reaction kettle, and adjusting the pH value of the solution to 4.5 ~ 7.0.0;
step 4, after the pH value is adjusted to 4.5 ~ 7.0.0, raising the temperature of the chemical reaction kettle, controlling the temperature of the solution in the chemical reaction kettle to reach 50 ~ 80 ℃, stopping stirring after the temperature of the chemical reaction kettle reaches a set value, and slowly reacting the materials in the chemical reaction kettle for 10 ~ 16 hours;
and 5: and opening a bottom valve of the chemical reaction kettle, wherein the material flowing out of the bottom valve is in a jelly shape, the color of the material is light pink, and the crosslinking reaction is finished.
The organic cross-linking agent J1 is:
the organic cross-linking agent J2 is:
the crosslinking reaction mechanism for preparing the polyacrylamide is as follows:
the chemical reaction kettle is an enamel reaction kettle.
The invention has the beneficial effects that: the product is obtained only by using the hydrolyzed polyacrylamide and the cross-linking agent, and the material consumption is less and is easy to obtain; one or more enamel reaction kettles with controllable temperature can be used for production; the method is environment-friendly, and no three wastes are discharged in the production process; the labor intensity of workers is low, and the mortar can be mixed with the slurry in any proportion at a construction site.
Drawings
FIG. 1 is a structural diagram of the configuration change of the crosslinked polyacrylamide.
Wherein: 1 is FeCl3A cross-linked non-hydrolyzed polyacrylamide; 2 is FeCl3A crosslinked hydrolyzed polyacrylamide; 3 is hydrolyzed polyacrylamide crosslinked by organic crosslinking agents J1 and J2; 4 is an aqueous solution of uncrosslinked polyacrylamide.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
A preparation method of crosslinked modified polyacrylamide for drilling fluid comprises the following steps:
step 1: adding a certain amount of tap water into a chemical reaction kettle, adding a certain amount of hydrolyzed polyacrylamide according to the water amount in the chemical reaction kettle, stirring at a low speed for 2 hours, and completely dissolving the hydrolyzed polyacrylamide, namely, completely dissolving the hydrolyzed polyacrylamide blocks in the chemical reaction kettle;
step 2, sequentially adding 0.2 ~ 0.7.7 percent of organic cross-linking agent J1 and 0.5-1.2 percent of organic cross-linking agent J2 into the reaction kettle according to the water amount in the chemical reaction kettle;
step 3, continuing stirring, adding a certain amount of concentrated hydrochloric acid into the chemical reaction kettle, and adjusting the pH value of the solution to 4.5 ~ 7.0.0;
step 4, after the pH value is adjusted to 4.5 ~ 7.0.0, raising the temperature of the chemical reaction kettle, controlling the temperature of the solution in the chemical reaction kettle to reach 50 ~ 80 ℃, stopping stirring after the temperature of the chemical reaction kettle reaches a set value, and slowly reacting the materials in the chemical reaction kettle for 10 ~ 16 hours;
and 5: and opening a bottom valve of the chemical reaction kettle, wherein the material flowing out of the bottom valve is in a jelly shape, the color of the material is light pink, and the crosslinking reaction is finished.
The organic cross-linking agent J1 is:
the organic cross-linking agent J2 is:
the crosslinking reaction mechanism for preparing the polyacrylamide is as follows:
the chemical reaction kettle is an enamel reaction kettle.
The carbonyl carboxyl in the cross-linking and the amide group in the hydrolyzed polyacrylamide are combined into a macromolecular with a spatial structure, the characteristics of the hydrolyzed polyacrylamide are fundamentally changed, and the crosslinked macromolecular is not changed after standing for 3 ~ 6 months.
For drilling mud, the strong spatial network macromolecules play an immeasurable role in carrying cuttings.
The strong polar molecules (double carbonyl or one carbonyl and one carboxyl) form coupling covalent bonds with nitrogen atoms on the hydrolyzed polyacrylamide, so that a large and firm network macromolecule is formed.
The dynamic shear force of the crosslinked polyacrylamide in the same drilling fluid is improved by about 40 percent compared with that of the polyacrylamide before crosslinking.
After scanning by a medical nuclear magnetic scanner, the configuration of the crosslinked polyacrylamide is changed, and the density is greatly increased. In FIG. 1, 1 is FeCl3A cross-linked non-hydrolyzed polyacrylamide; 2 is FeCl3Cross-linked hydrolyzed polyacrylamides, which have different density increases, short signals and macromolecular structures; 3 is J1, and J2 is hydrolyzed polyacrylamide crosslinked by organic crosslinking agent, is viscous, has uneven signals and is in a net structure; 4 is the water solution of the non-crosslinked polyacrylamide in a clear water state; this shows that the cross-linking agent J1, J2 cross-linked polyacrylamide has a macromolecular network structure and a rock-carrying capacity in drilling.
The cross-linked polyacrylamide has no harmful chemical elements when measured by an X-ray diffractometer.
Now, six samples were subjected to elemental testing using an inductively coupled plasma emission spectrometer (ICP) (equipment model: Varian 710-ES), and the results were as follows:
the reaction adopts the latter to form a new substance with different configuration, and the substance is jelly-like, is completely different from hydrolyzed polyacrylamide before crosslinking and is also different from hydrolyzed polyacrylamide formed by other crosslinking agents.
Claims (5)
1. A preparation method of crosslinked modified polyacrylamide for drilling fluid is characterized by comprising the following steps: the preparation method comprises the following steps:
step 1, adding a certain amount of tap water into a chemical reaction kettle, adding 1 ~ 5% of hydrolyzed polyacrylamide according to the water amount in the chemical reaction kettle, stirring at a low speed for 2 hours until the hydrolyzed polyacrylamide is completely dissolved, namely, adding anhydrous polyacrylamide blocks into the chemical reaction kettle;
step 2, sequentially adding 0.2 ~ 0.7.7 percent of organic cross-linking agent J1 and 0.5-1.2 percent of organic cross-linking agent J2 into the reaction kettle according to the water amount in the chemical reaction kettle;
step 3, continuing stirring, adding a certain amount of concentrated hydrochloric acid into the chemical reaction kettle, and adjusting the pH value of the solution to 4.5 ~ 7.0.0;
step 4, after the pH value is adjusted to 4.5 ~ 7.0.0, raising the temperature of the chemical reaction kettle, controlling the temperature of the solution in the chemical reaction kettle to reach 50 ~ 80 ℃, stopping stirring after the temperature of the chemical reaction kettle reaches a set value, and slowly reacting the materials in the chemical reaction kettle for 10 ~ 16 hours;
and 5: and opening a bottom valve of the chemical reaction kettle, wherein the material flowing out of the bottom valve is in a jelly shape, the color of the material is light pink, and the crosslinking reaction is finished.
2. The preparation method of the crosslinked modified polyacrylamide for the drilling fluid according to claim 1, wherein the preparation method comprises the following steps: the organic cross-linking agent J1 is:
。
3. the preparation method of the crosslinked modified polyacrylamide for the drilling fluid according to claim 1, wherein the preparation method comprises the following steps: the organic cross-linking agent J2 is:
。
4. the preparation method of the crosslinked modified polyacrylamide for the drilling fluid according to claim 1, wherein the preparation method comprises the following steps: the crosslinking reaction mechanism for preparing the polyacrylamide is as follows:
。
5. the preparation method of the crosslinked modified polyacrylamide for the drilling fluid according to claim 1, wherein the preparation method comprises the following steps: the chemical reaction kettle is an enamel reaction kettle.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910988703.2A CN110628055A (en) | 2019-10-17 | 2019-10-17 | Preparation method of crosslinked modified polyacrylamide for drilling fluid |
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| CN201910988703.2A CN110628055A (en) | 2019-10-17 | 2019-10-17 | Preparation method of crosslinked modified polyacrylamide for drilling fluid |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104277164A (en) * | 2013-07-05 | 2015-01-14 | 湖北禧邦可环保科技有限公司 | Preparation method for high polymer flocculant |
| CN105417665A (en) * | 2014-09-17 | 2016-03-23 | 山东聚鑫化工有限公司 | Modified polyacrylamide flocculant |
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- 2019-10-17 CN CN201910988703.2A patent/CN110628055A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104277164A (en) * | 2013-07-05 | 2015-01-14 | 湖北禧邦可环保科技有限公司 | Preparation method for high polymer flocculant |
| CN105417665A (en) * | 2014-09-17 | 2016-03-23 | 山东聚鑫化工有限公司 | Modified polyacrylamide flocculant |
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Application publication date: 20191231 |