CN110330956B - Environment-friendly polyamino acid viscosity reducer for drilling fluid and preparation method thereof - Google Patents
Environment-friendly polyamino acid viscosity reducer for drilling fluid and preparation method thereof Download PDFInfo
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- CN110330956B CN110330956B CN201910617540.7A CN201910617540A CN110330956B CN 110330956 B CN110330956 B CN 110330956B CN 201910617540 A CN201910617540 A CN 201910617540A CN 110330956 B CN110330956 B CN 110330956B
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- C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
- C08G69/02—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids
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- 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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Abstract
The invention provides an environment-friendly polyamino acid viscosity reducer for drilling fluid and a preparation method thereof, belonging to the technical field of oil-gas exploration and development; the polyamino acid viscosity reducer prepared by the invention comprises the following raw materials in parts by weight: 30-35 parts of amino acid A, 10-13 parts of amino acid B, 10-15 parts of catalyst, 20-25 parts of sodium hydroxide, 15-20 parts of initiator and 100-120 parts of water; the polyamino acid viscosity reducer synthesized by taking amino acid as a raw material has high viscosity reduction rate, good salt and calcium resistance and good temperature resistance, and the viscosity reduction rate can still reach more than 65% in a 120 ℃ hot rolling experiment; the polyamino acid used as the green environment-friendly viscosity reducer can be automatically biodegraded, does not pollute soil near a drilling well, and accords with the environmental protection concept of current oil and gas field development.
Description
Technical Field
The invention relates to an environment-friendly polyamino acid viscosity reducer for drilling fluid and a preparation method thereof, belonging to the technical field of oil-gas exploration and development.
Background
Drilling fluid treating agents are one of the important oil field chemicals and are substances capable of regulating the performance of drilling fluids. For each oil and gas well, various slurry raw materials and chemical treatment agents are used according to a certain formula to prepare the required drilling fluid, or the slurry raw materials and the chemical treatment agents are added into the drilling fluid in use so as to adjust and maintain the performance of the drilling fluid at any time. In general, the drilling fluid preparation raw material refers to the basic components used in the preparation in larger amount, such as bentonite, water, oil, barite and the like. The treating agent is a chemical additive which is used for improving and stabilizing the performance of the drilling fluid or is added to meet the requirement of certain performance of the drilling fluid. The treating agent is the core part of the drilling fluid, and the performance of the drilling fluid is greatly influenced by a small amount of the treating agent.
The viscosity reducer has the main functions of preferentially adsorbing the weak hydration places at the edges of the clay, increasing the hydration layers at the positions by hydrophilic groups, weakening or breaking up the network structure formed by clay particles, releasing free water, reducing the flow friction resistance among the clay particles and reducing the shearing force and the viscosity of the drilling fluid. The viscosity reducer can inhibit the hydration expansion and dispersion of the drill cuttings, so that the number of solid particles can be reduced, the viscosity of the drilling fluid can be reduced, and the fluidity of the drilling fluid can be improved. Although the solid control equipment can effectively remove various solid phases in the drilling fluid, and has the functions of adjusting the rheological property of the drilling fluid and reducing the using amount of the viscosity reducer, the existing on-site solid control equipment is not ideal in use, and the function of the viscosity reducer is more important.
The drilling fluid viscosity reducer at home and abroad has various varieties, but the geological conditions are more and more complicated along with the exploration and development of oil gas, and the inherent defects of the conventional drilling fluid viscosity reducer are continuously exposed. Although the natural polymer viscosity reducer has easily available raw materials and low price, the natural polymer viscosity reducer has more defects, has poor temperature resistance and salt resistance, and even contains toxic components such as iron-chromium lignosulfonate. At present, the polymer drilling fluid viscosity reducer is applied to oil fields more frequently, and has good treatment effect and high price. Some viscosity reducers have good viscosity reduction effect evaluated in laboratories, the dosage needs to be increased when the viscosity reducers are applied on site, if the dosage is too small, the viscosity reducers can be quickly removed along with rock debris and polymers, the maintenance period is short, and the drilling cost is increased. Moreover, polymers synthesized from monomers such as acrylic acid are not easily degraded, pollute the environment and are not beneficial to environmental protection.
Therefore, the invention of the efficient, cheap and biodegradable viscosity reducer for drilling fluid is an important direction for current oil and gas field development.
Disclosure of Invention
Aiming at some problems in the prior art, the invention provides an environment-friendly polyamino acid viscosity reducer for drilling fluid, which comprises the following raw materials in parts by weight: 30-35 parts of amino acid A, 10-13 parts of amino acid B, 10-15 parts of catalyst, 20-25 parts of sodium hydroxide, 15-20 parts of initiator and 100-120 parts of water; the amino acid A is acidic amino acid, and the amino acid B comprises basic amino acid or polar neutral amino acid.
As a preferable technical scheme of the invention, the weight ratio of the amino acid A to the amino acid B to the initiator is (2-4): (0.5-1.5): (0.5-2).
As a more preferable technical scheme of the invention, the weight part ratio of the amino acid A to the amino acid B to the initiator is (2.5-3.5): 1: (1.3-1.8).
In a preferred embodiment of the present invention, the acidic amino acid is one of L-aspartic acid and glutamic acid.
In a preferred embodiment of the present invention, the basic amino acid is one of lysine and arginine, and the polar neutral amino acid is one of asparagine and glutamine.
In a most preferred embodiment of the present invention, the amino acid B is lysine.
In a preferred embodiment of the present invention, the initiator is amino acid C.
In a preferred embodiment of the present invention, the amino acid C is an amino acid having an aromatic ring structure.
In a most preferred embodiment of the present invention, the amino acid having an aromatic ring structure is one selected from the group consisting of phenylalanine, tryptophan, and tyrosine.
In a preferred embodiment of the present invention, the catalyst is one of phosphoric acid and polyphosphoric acid.
The second aspect of the invention provides a preparation method of an environment-friendly polyamino acid viscosity reducer for drilling fluid, which is a preferable technical scheme of the invention, and the preparation method comprises the following steps:
(1) adding amino acid A, a catalyst and 5-10 parts of water into a reaction kettle in sequence, and reacting for 2-5 hours at 170-200 ℃;
(2) adding amino acid B into the reaction kettle in the step 1, and reacting for 2-5 h at 170-200 ℃ to obtain an intermediate;
(3) dissolving the intermediate obtained in the reaction kettle in the step 2 in the residual water, keeping the temperature at 10-60 ℃, adding an initiator, and stirring for reaction for 2-5 hours;
(4) and (3) adding sodium hydroxide into the reaction kettle in the step (3), and adjusting the pH value to 8-11 to obtain the polyamino acid viscosity reducer.
As a more preferable technical scheme, the preparation method of the polyamino acid viscosity reducer for the environment-friendly drilling fluid comprises the following steps:
(1) adding amino acid A, a catalyst and 5-10 parts of water into a reaction kettle in sequence, and reacting for 2.5-4 hours at 175-180 ℃;
(2) adding amino acid B into the reaction kettle in the step 1, and reacting for 2.5-4.5 h at 175-180 ℃ to obtain an intermediate;
(3) dissolving the intermediate obtained in the reaction kettle in the step 2 in the residual water, keeping the temperature at 20-40 ℃, adding an initiator, and stirring for reaction for 3 hours;
(4) and (3) adding sodium hydroxide into the reaction kettle in the step (3), and adjusting the pH value to 9 to obtain the polyamino acid viscosity reducer.
As a most preferred technical scheme, the preparation method of the polyamino acid viscosity reducer for the environment-friendly drilling fluid comprises the following steps:
(1) adding the amino acid A, a catalyst and 8 parts of water into a reaction kettle in sequence, and reacting for 3.5 hours at 178 ℃;
(2) adding amino acid B into the reaction kettle in the step 1, and reacting for 4 hours at 180 ℃ to obtain an intermediate;
(3) dissolving the intermediate obtained in the reaction kettle in the step 2 in the residual water, keeping the temperature at 23 ℃, adding an initiator, and stirring for reaction for 3 hours;
(4) and (3) adding sodium hydroxide into the reaction kettle in the step (3), and adjusting the pH value to 9 to obtain the polyamino acid viscosity reducer.
Has the advantages that: the polyamino acid viscosity reducer synthesized by taking amino acid as a raw material has high viscosity reduction rate and good salt and calcium resistance, and the dispersing performance of bentonite slurry is greatly improved along with the increase of the addition amount. Meanwhile, the viscosity reduction rate can still reach more than 65 percent in a hot rolling experiment at 120 ℃. Compared with the traditional FCSL and polyacrylic acid viscosity reducers, the viscosity reducer has better viscosity reducing performance and good compatibility with other drilling fluid additives. Meanwhile, the polyamino acid viscosity reducer has good corrosion inhibition performance, and prevents drill pipe corrosion of the drilling tool. The polyamino acid used as the green environment-friendly viscosity reducer can be automatically biodegraded, does not pollute soil near a drilling well, and accords with the environmental protection concept of current oil and gas field development.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any inventive step based on the embodiments of the present invention, belong to the scope of protection of the present invention, and the present invention is described below by way of specific embodiments, but is not limited to the specific embodiments given below.
The invention provides an environment-friendly polyamino acid viscosity reducer for drilling fluid, which comprises the following raw materials in parts by weight: 30-35 parts of amino acid A, 10-13 parts of amino acid B, 10-15 parts of catalyst, 20-25 parts of sodium hydroxide, 15-20 parts of initiator and 100-120 parts of water; the amino acid A is acidic amino acid, and the amino acid B comprises basic amino acid or polar neutral amino acid.
In a preferred embodiment, the weight ratio of the amino acid A to the amino acid B to the initiator is (2-4): (0.5-1.5): (0.5-2).
In a more preferred embodiment, the weight ratio of the amino acid A to the amino acid B to the initiator is (2.5-3.5): 1: (1.3-1.8).
In the experimental process, the applicant finds that the property of the polyamino acid viscosity reducer is greatly related to the molecular structure. The weight parts of the amino acid A, the amino acid B and the initiator are as follows: (2-4): (0.5-1.5): (0.5-2), the viscosity reduction rate of the viscosity reducer is further improved, and the suspected reason is as follows: the polyamino acid viscosity reducer contains polar groups such as-COO-, -NH2 and the like and-CH 2-nonpolar groups, and because acting forces such as attraction, repulsion and the like of different groups in drilling fluid are different, polyamino acid molecules have different stretching forms in the drilling fluid, so that the polyamino acid viscosity reducer has different adsorption properties on clays in different forms. The weight parts of the amino acid A, the amino acid B and the initiator are as follows: (2.5-3.5): 1: (1.3-1.8), the polar groups and the nonpolar groups in the molecules coexist according to a certain proportion, and the adsorption requirements of the clays in different forms are met, so that the thickness of the hydration film on the surfaces of the clay particles is increased, the mutual repulsive force among the clay particles is enhanced, the spatial network structure formed among the clay particles is removed, free water is released, and the viscosity reduction effect of the polyamino acid is maintained in an optimal state.
In a preferred embodiment, the acidic amino acid is one of L-aspartic acid and glutamic acid.
In a most preferred embodiment, the amino acid A is L-aspartic acid.
In a most preferred embodiment, the L-aspartic acid is present in an amount of 33 parts by weight.
In a preferred embodiment, the L-aspartic acid is obtained from Tiaoh chemical Co., Ltd, Guangzhou under CAS number 56-84-8.
In a preferred embodiment, the basic amino acid is one of lysine and arginine, and the polar neutral amino acid is one of asparagine and glutamine.
The applicant found that the polymer formed from L-aspartic acid alone had less adsorption on the clay particles and the viscosity reduction rate was reduced. After the amino acid B is added, the amino acid B and aspartic acid form a block polymer, the block polymer is adsorbed on clay particles on one hand, a network structure formed among the clay particles is broken up, and simultaneously the block polymer reacts with other polymers in a drilling fluid system to form a stable complex, and the network structure formed by interaction among other polymers is broken up; particularly, when the amino acid B is lysine, the viscosity reduction rate of the obtained polyamino acid viscosity reducer is improved most remarkably, and the reason is guessed that: the viscosity reducer firstly forms a thin hydrated cation adsorption layer on the particle surface, then the viscosity reducer gradually diffuses from the surface of the adsorption layer to a position where the solution concentration is uniform to form a diffusion layer, the adsorption layer and the diffusion layer are respectively provided with opposite charges, and when the amino acid B is lysine, the potential difference between the adsorption layer and the diffusion layer increases the repulsive force between clay colloidal particles, so that the viscosity of the drilling fluid is reduced, and the fluidity is improved.
In a most preferred embodiment, the amino acid B is lysine.
In a most preferred embodiment, the lysine is present in an amount of 11 parts by weight.
In a most preferred embodiment, the lysine is purchased from Yuan Sai science and technology, Inc. of Hubei, under CAS number 56-87-1.
In one embodiment, the lysine substitute is asparagine.
In one embodiment, the asparagine is purchased from Wuhanxin Yew chemical Co., Ltd, CAS number 5794-13-8.
In one embodiment, the lysine substitute is glutamine.
In one embodiment, the glutamine is purchased from Nanjing peptide Biotech, Inc. under CAS number 61348-28-5.
In a preferred embodiment, the initiator is amino acid C.
In a preferred embodiment, the amino acid C is an amino acid containing an aromatic ring structure.
In a preferred embodiment, the amino acid having an aromatic ring structure is one selected from phenylalanine, tryptophan and tyrosine.
The applicant finds that after amino acid A and amino acid B are polymerized into a ring under the action of a catalyst, an initiator is added to promote the ring opening of polyamide to form a polymer containing rigid groups, and a large amount of-COO is contained on a polymer molecular chain-And the-CONH group is adsorbed on the surface of the clay particles with positive charges, so that the mutual repulsion among the clays is enhanced, and meanwhile, the polar group enables the end surfaces of the clay particles to form a thick hydration layer, so that the end-to-end and end-to-surface connection among the clays is weakened, and the viscosity of the drilling fluid is reduced. The applicant has found that, surprisingly, the viscosity reduction rate decreases only slightly in a hot rolling test at 120 ℃ in particular when the initiator is tryptophan. The reason for guessing may be: when the viscosity reducer is just contacted with the clay, a loose adsorption layer is rapidly formed on the surface of the clay, the surface of the clay is gradually and completely covered with time, and the coplanarity among aromatic rings can be enhanced by the existence of active groups in tryptophan, so that the viscosity reducer is finally promoted to form on the surface of the clayThe dense multi-layer adsorption layer ensures that the viscosity reducer still has high viscosity reduction rate under high temperature.
In a most preferred embodiment, the initiator is tryptophan.
In a most preferred embodiment, the tryptophan is present in an amount of 18 parts by weight.
In a most preferred embodiment, the tryptophan is purchased from Hubei Jusheng technologies, Inc. under CAS number 73-22-3.
In one embodiment, the tryptophan surrogate is phenylalanine.
In one embodiment, the phenylalanine is purchased from Yuan Sai science and technology, Inc. Hubei under CAS number 673-31-4.
In one embodiment, the tryptophan surrogate is tyrosine.
In one embodiment, the tyrosine is purchased from Yuan Sai science and technology, Inc. of Hubei under CAS number 60-18-4.
In a preferred embodiment, the catalyst is phosphoric acid, polyphosphoric acid.
In a most preferred embodiment, the catalyst is polyphosphoric acid.
In a most preferred embodiment, the polyphosphoric acid is 12 parts by weight.
In a most preferred embodiment, the polyphosphoric acid is available from Hangzhou Bingyi chemical company, Inc. under CAS number 8017-16-1.
In a second aspect, the invention provides a preparation method of the polyamino acid viscosity reducer for the environment-friendly drilling fluid, and in a preferred embodiment, the preparation method comprises the following steps:
(1) adding amino acid A, a catalyst and 5-10 parts of water into a reaction kettle in sequence, and reacting for 2-5 hours at 170-200 ℃;
(2) adding amino acid B into the reaction kettle in the step 1, and reacting for 2-5 h at 170-200 ℃ to obtain an intermediate;
(3) dissolving the intermediate obtained in the reaction kettle in the step 2 in the residual water, keeping the temperature at 10-60 ℃, adding an initiator, and stirring for reaction for 2-5 hours;
(4) and (3) adding sodium hydroxide into the reaction kettle in the step (3), and adjusting the pH value to 8-11 to obtain the polyamino acid viscosity reducer.
In a more preferred embodiment, the preparation method of the polyamino acid viscosity reducer for the environment-friendly drilling fluid comprises the following steps:
(1) adding amino acid A, a catalyst and 5-10 parts of water into a reaction kettle in sequence, and reacting for 2.5-4 hours at 175-180 ℃;
(2) adding amino acid B into the reaction kettle in the step 1, and reacting for 2.5-4.5 h at 175-180 ℃ to obtain an intermediate;
(3) dissolving the intermediate obtained in the reaction kettle in the step 2 in the residual water, keeping the temperature at 20-40 ℃, adding an initiator, and stirring for reaction for 3 hours;
(4) and (3) adding sodium hydroxide into the reaction kettle in the step (3), and adjusting the pH value to 9 to obtain the polyamino acid viscosity reducer.
In a most preferred embodiment, the preparation method of the polyamino acid viscosity reducer for the environment-friendly drilling fluid comprises the following steps:
(1) adding the amino acid A, a catalyst and 8 parts of water into a reaction kettle in sequence, and reacting for 3.5 hours at 178 ℃;
(2) adding amino acid B into the reaction kettle in the step 1, and reacting for 4 hours at 180 ℃ to obtain an intermediate;
(3) dissolving the intermediate obtained in the reaction kettle in the step 2 in the residual water, keeping the temperature at 23 ℃, adding an initiator, and stirring for reaction for 3 hours;
(4) and (3) adding sodium hydroxide into the reaction kettle in the step (3), and adjusting the pH value to 9 to obtain the polyamino acid viscosity reducer.
Example 1
The embodiment 1 of the invention provides an environment-friendly polyamino acid viscosity reducer for drilling fluid, which comprises the following raw materials, by weight, 33 parts of L-aspartic acid, 11 parts of lysine, 12 parts of polyphosphoric acid, 23 parts of sodium hydroxide, 18 parts of tryptophan and 115 parts of water.
The invention provides a preparation method of an environment-friendly polyamino acid viscosity reducer for drilling fluid, which comprises the following steps:
(1) adding L-aspartic acid, polyphosphoric acid and 8 parts of water into a reaction kettle in sequence, and reacting for 3.5 hours at 178 ℃;
(2) adding lysine into the reaction kettle in the step 1, and reacting for 4 hours at 180 ℃ to obtain an intermediate;
(3) dissolving the intermediate obtained in the reaction kettle in the step 2 in 107 parts of water, keeping the temperature at 23 ℃, slowly adding tryptophan, and stirring for reaction for 3 hours;
(4) and (3) adding sodium hydroxide into the reaction kettle in the step (3), and adjusting the pH value to 9 to obtain the polyamino acid viscosity reducer.
Example 2
The embodiment 2 of the invention provides an environment-friendly polyamino acid viscosity reducer for drilling fluid, which comprises the following raw materials, by weight, 30 parts of L-aspartic acid, 10 parts of lysine, 10 parts of polyphosphoric acid, 20 parts of sodium hydroxide, 15 parts of tryptophan and 100 parts of water.
The invention provides a preparation method of an environment-friendly polyamino acid viscosity reducer for drilling fluid, which comprises the following steps:
(1) adding L-aspartic acid, polyphosphoric acid and 8 parts of water into a reaction kettle in sequence, and reacting for 3.5 hours at 178 ℃;
(2) adding lysine into the reaction kettle in the step 1, and reacting for 4 hours at 180 ℃ to obtain an intermediate;
(3) dissolving the intermediate obtained in the reaction kettle in the step 2 in 92 parts of water, keeping the temperature at 23 ℃, slowly adding tryptophan, and stirring for reaction for 3 hours;
(4) and (3) adding sodium hydroxide into the reaction kettle in the step (3), and adjusting the pH value to 9 to obtain the polyamino acid viscosity reducer.
Example 3
The embodiment 3 of the invention provides an environment-friendly polyamino acid viscosity reducer for drilling fluid, which comprises the following raw materials, by weight, 35 parts of L-aspartic acid, 13 parts of lysine, 15 parts of polyphosphoric acid, 25 parts of sodium hydroxide, 20 parts of tryptophan and 120 parts of water.
The invention provides a preparation method of an environment-friendly polyamino acid viscosity reducer for drilling fluid, which comprises the following steps:
(1) adding L-aspartic acid, polyphosphoric acid and 8 parts of water into a reaction kettle in sequence, and reacting for 3.5 hours at 178 ℃;
(2) adding lysine into the reaction kettle in the step 1, and reacting for 4 hours at 180 ℃ to obtain an intermediate;
(3) dissolving the intermediate obtained in the reaction kettle in the step 2 in 112 parts of water, keeping the temperature at 23 ℃, slowly adding tryptophan, and stirring for reaction for 3 hours;
(4) and (3) adding sodium hydroxide into the reaction kettle in the step (3), and adjusting the pH value to 9 to obtain the polyamino acid viscosity reducer.
Example 4
The embodiment 4 of the invention provides an environment-friendly polyamino acid viscosity reducer for drilling fluid, which comprises the following raw materials, by weight, 33 parts of L-aspartic acid, 9 parts of lysine, 12 parts of polyphosphoric acid, 23 parts of sodium hydroxide, 18 parts of tryptophan and 115 parts of water.
The invention provides a preparation method of an environment-friendly polyamino acid viscosity reducer for drilling fluid, which comprises the following steps:
(1) adding L-aspartic acid, polyphosphoric acid and 8 parts of water into a reaction kettle in sequence, and reacting for 3.5 hours at 178 ℃;
(2) adding lysine into the reaction kettle in the step 1, and reacting for 4 hours at 180 ℃ to obtain an intermediate;
(3) dissolving the intermediate obtained in the reaction kettle in the step 2 in 107 parts of water, keeping the temperature at 23 ℃, slowly adding tryptophan, and stirring for reaction for 3 hours;
(4) and (3) adding sodium hydroxide into the reaction kettle in the step (3), and adjusting the pH value to 9 to obtain the polyamino acid viscosity reducer.
Example 5
The embodiment 5 of the invention provides an environment-friendly polyamino acid viscosity reducer for drilling fluid, which comprises the following raw materials, by weight, 33 parts of L-aspartic acid, 15 parts of lysine, 12 parts of polyphosphoric acid, 23 parts of sodium hydroxide, 18 parts of tryptophan and 115 parts of water.
The invention provides a preparation method of an environment-friendly polyamino acid viscosity reducer for drilling fluid, which comprises the following steps:
(1) adding L-aspartic acid, polyphosphoric acid and 8 parts of water into a reaction kettle in sequence, and reacting for 3.5 hours at 178 ℃;
(2) adding lysine into the reaction kettle in the step 1, and reacting for 4 hours at 180 ℃ to obtain an intermediate;
(3) dissolving the intermediate obtained in the reaction kettle in the step 2 in 107 parts of water, keeping the temperature at 23 ℃, slowly adding tryptophan, and stirring for reaction for 3 hours;
(4) and (3) adding sodium hydroxide into the reaction kettle in the step (3), and adjusting the pH value to 9 to obtain the polyamino acid viscosity reducer.
Example 6
The embodiment 6 of the invention provides an environment-friendly polyamino acid viscosity reducer for drilling fluid, which comprises the following raw materials, by weight, 33 parts of L-aspartic acid, 11 parts of asparagine, 12 parts of polyphosphoric acid, 23 parts of sodium hydroxide, 18 parts of tryptophan and 115 parts of water.
The invention provides a preparation method of an environment-friendly polyamino acid viscosity reducer for drilling fluid, which comprises the following steps:
(1) adding L-aspartic acid, polyphosphoric acid and 8 parts of water into a reaction kettle in sequence, and reacting for 3.5 hours at 178 ℃;
(2) adding asparagine into the reaction kettle in the step 1, and reacting for 4 hours at 180 ℃ to obtain an intermediate;
(3) dissolving the intermediate obtained in the reaction kettle in the step 2 in 107 parts of water, keeping the temperature at 23 ℃, slowly adding tryptophan, and stirring for reaction for 3 hours;
(4) and (3) adding sodium hydroxide into the reaction kettle in the step (3), and adjusting the pH value to 9 to obtain the polyamino acid viscosity reducer.
Example 7
The embodiment 7 of the invention provides an environment-friendly polyamino acid viscosity reducer for drilling fluid, which comprises the following raw materials, by weight, 33 parts of L-aspartic acid, 11 parts of glutamine, 12 parts of polyphosphoric acid, 23 parts of sodium hydroxide, 18 parts of tryptophan and 115 parts of water.
The invention provides a preparation method of an environment-friendly polyamino acid viscosity reducer for drilling fluid, which comprises the following steps:
(1) adding L-aspartic acid, polyphosphoric acid and 8 parts of water into a reaction kettle in sequence, and reacting for 3.5 hours at 178 ℃;
(2) adding glutamine into the reaction kettle in the step 1, and reacting for 4 hours at 180 ℃ to obtain an intermediate;
(3) dissolving the intermediate obtained in the reaction kettle in the step 2 in 107 parts of water, keeping the temperature at 23 ℃, slowly adding tryptophan, and stirring for reaction for 3 hours;
(4) and (3) adding sodium hydroxide into the reaction kettle in the step (3), and adjusting the pH value to 9 to obtain the polyamino acid viscosity reducer.
Example 8
The embodiment 8 of the invention provides an environment-friendly polyamino acid viscosity reducer for drilling fluid, which comprises the following raw materials, by weight, 33 parts of L-aspartic acid, 11 parts of lysine, 12 parts of polyphosphoric acid, 23 parts of sodium hydroxide, 18 parts of phenylalanine and 115 parts of water.
The invention provides a preparation method of an environment-friendly polyamino acid viscosity reducer for drilling fluid, which comprises the following steps:
(1) adding L-aspartic acid, polyphosphoric acid and 8 parts of water into a reaction kettle in sequence, and reacting for 3.5 hours at 178 ℃;
(2) adding lysine into the reaction kettle in the step 1, and reacting for 4 hours at 180 ℃ to obtain an intermediate;
(3) dissolving the intermediate obtained in the reaction kettle in the step 2 in 107 parts of water, keeping the temperature at 23 ℃, slowly adding phenylalanine, and stirring for reaction for 3 hours;
(4) and (3) adding sodium hydroxide into the reaction kettle in the step (3), and adjusting the pH value to 9 to obtain the polyamino acid viscosity reducer.
Example 9
The embodiment 9 of the invention provides an environment-friendly polyamino acid viscosity reducer for drilling fluid, which comprises the following raw materials, by weight, 33 parts of L-aspartic acid, 11 parts of lysine, 12 parts of polyphosphoric acid, 23 parts of sodium hydroxide, 18 parts of leucine and 115 parts of water.
The invention provides a preparation method of an environment-friendly polyamino acid viscosity reducer for drilling fluid, which comprises the following steps:
(1) adding L-aspartic acid, polyphosphoric acid and 8 parts of water into a reaction kettle in sequence, and reacting for 3.5 hours at 178 ℃;
(2) adding lysine into the reaction kettle in the step 1, and reacting for 4 hours at 180 ℃ to obtain an intermediate;
(3) dissolving the intermediate obtained in the reaction kettle in the step 2 in 107 parts of water, keeping the temperature at 23 ℃, slowly adding the tyrosine, and stirring for reaction for 3 hours;
(4) and (3) adding sodium hydroxide into the reaction kettle in the step (3), and adjusting the pH value to 9 to obtain the polyamino acid viscosity reducer.
Example 10
The embodiment 10 of the invention provides an environment-friendly polyamino acid viscosity reducer for drilling fluid, which comprises the following raw materials, by weight, 33 parts of L-aspartic acid, 11 parts of lysine, 12 parts of polyphosphoric acid, 23 parts of sodium hydroxide, 16.5 parts of tryptophan and 115 parts of water.
The invention provides a preparation method of an environment-friendly polyamino acid viscosity reducer for drilling fluid, which comprises the following steps:
(1) adding L-aspartic acid, polyphosphoric acid and 8 parts of water into a reaction kettle in sequence, and reacting for 3.5 hours at 178 ℃;
(2) adding lysine into the reaction kettle in the step 1, and reacting for 4 hours at 180 ℃ to obtain an intermediate;
(3) dissolving the intermediate obtained in the reaction kettle in the step 2 in 107 parts of water, keeping the temperature at 23 ℃, slowly adding tryptophan, and stirring for reaction for 3 hours;
(4) and (3) adding sodium hydroxide into the reaction kettle in the step (3), and adjusting the pH value to 9 to obtain the polyamino acid viscosity reducer.
Example 11
The embodiment 11 of the invention provides an environment-friendly polyamino acid viscosity reducer for drilling fluid, which comprises the following raw materials, by weight, 33 parts of L-aspartic acid, 11 parts of lysine, 12 parts of polyphosphoric acid, 23 parts of sodium hydroxide, 19 parts of tryptophan and 115 parts of water.
The invention provides a preparation method of an environment-friendly polyamino acid viscosity reducer for drilling fluid, which comprises the following steps:
(1) adding L-aspartic acid, polyphosphoric acid and 8 parts of water into a reaction kettle in sequence, and reacting for 3.5 hours at 178 ℃;
(2) adding lysine into the reaction kettle in the step 1, and reacting for 4 hours at 180 ℃ to obtain an intermediate;
(3) dissolving the intermediate obtained in the reaction kettle in the step 2 in 107 parts of water, keeping the temperature at 23 ℃, slowly adding tryptophan, and stirring for reaction for 3 hours;
(4) and (3) adding sodium hydroxide into the reaction kettle in the step (3), and adjusting the pH value to 9 to obtain the polyamino acid viscosity reducer.
Example 12
The embodiment 12 of the invention provides an environment-friendly polyamino acid viscosity reducer for drilling fluid, which comprises the following raw materials, by weight, 33 parts of L-aspartic acid, 11 parts of lysine, 12 parts of polyphosphoric acid, 23 parts of sodium hydroxide, 12 parts of tryptophan and 115 parts of water.
The invention provides a preparation method of an environment-friendly polyamino acid viscosity reducer for drilling fluid, which comprises the following steps:
(1) adding L-aspartic acid, polyphosphoric acid and 8 parts of water into a reaction kettle in sequence, and reacting for 3.5 hours at 178 ℃;
(2) adding lysine into the reaction kettle in the step 1, and reacting for 4 hours at 180 ℃ to obtain an intermediate;
(3) dissolving the intermediate obtained in the reaction kettle in the step 2 in 107 parts of water, keeping the temperature at 23 ℃, slowly adding tryptophan, and stirring for reaction for 3 hours;
(4) and (3) adding sodium hydroxide into the reaction kettle in the step (3), and adjusting the pH value to 9 to obtain the polyamino acid viscosity reducer.
Example 13
The embodiment 13 of the invention provides an environment-friendly polyamino acid viscosity reducer for drilling fluid, which comprises the following raw materials, by weight, 33 parts of L-aspartic acid, 11 parts of lysine, 12 parts of polyphosphoric acid, 23 parts of sodium hydroxide, 24 parts of tryptophan and 115 parts of water.
The invention provides a preparation method of an environment-friendly polyamino acid viscosity reducer for drilling fluid, which comprises the following steps:
(1) adding L-aspartic acid, polyphosphoric acid and 8 parts of water into a reaction kettle in sequence, and reacting for 3.5 hours at 178 ℃;
(2) adding lysine into the reaction kettle in the step 1, and reacting for 4 hours at 180 ℃ to obtain an intermediate;
(3) dissolving the intermediate obtained in the reaction kettle in the step 2 in 107 parts of water, keeping the temperature at 23 ℃, slowly adding tryptophan, and stirring for reaction for 3 hours;
(4) and (3) adding sodium hydroxide into the reaction kettle in the step (3), and adjusting the pH value to 9 to obtain the polyamino acid viscosity reducer.
Example 14
The embodiment 14 of the invention provides an environment-friendly polyamino acid viscosity reducer for drilling fluid, which comprises the following raw materials, by weight, 33 parts of L-aspartic acid, 12 parts of polyphosphoric acid, 23 parts of sodium hydroxide, 18 parts of tryptophan and 115 parts of water.
The invention provides a preparation method of an environment-friendly polyamino acid viscosity reducer for drilling fluid, which comprises the following steps:
(1) adding L-aspartic acid, polyphosphoric acid and 8 parts of water into a reaction kettle in sequence, and reacting for 3.5 hours at 178 ℃;
(2) adding 107 parts of water into the reaction kettle in the step 1, keeping the temperature at 23 ℃, slowly adding tryptophan, and stirring for reaction for 3 hours;
(3) and (3) adding sodium hydroxide into the reaction kettle in the step (2), and adjusting the pH value to 9 to obtain the polyamino acid viscosity reducer.
Example 15
The embodiment 15 of the invention provides an environment-friendly polyamino acid viscosity reducer for drilling fluid, which comprises the following raw materials, by weight, 50 parts of L-aspartic acid, 11 parts of lysine, 12 parts of polyphosphoric acid, 23 parts of sodium hydroxide, 18 parts of tryptophan and 115 parts of water.
The invention provides a preparation method of an environment-friendly polyamino acid viscosity reducer for drilling fluid, which comprises the following steps:
(1) adding L-aspartic acid, polyphosphoric acid and 8 parts of water into a reaction kettle in sequence, and reacting for 3.5 hours at 178 ℃;
(2) adding lysine into the reaction kettle in the step 1, and reacting for 4 hours at 180 ℃ to obtain an intermediate;
(3) dissolving the intermediate obtained in the reaction kettle in the step 2 in 107 parts of water, keeping the temperature at 23 ℃, slowly adding tryptophan, and stirring for reaction for 3 hours;
(4) and (3) adding sodium hydroxide into the reaction kettle in the step (3), and adjusting the pH value to 9 to obtain the polyamino acid viscosity reducer.
And (3) performance testing:
1. measurement of viscosity reduction Rate
The test method comprises the following steps: the test is carried out according to the relevant regulations of viscosity reducer polyamino acids YR-1 for drilling fluid in the enterprise standard Q/DLYH017-2019 Yirui chemical Co., Ltd.
1.1 preparation of the base stock
Adding 500ml of distilled water, 1.2g of anhydrous sodium carbonate, 30g of sodium bentonite and 55g of evaluation soil into a goblet, stirring at a high speed for 20min, stopping at least twice during stirring to scrape the bentonite adhered to the wall of the container, and sealing and maintaining for 24h at 24 +/-3 ℃.
1.2 viscosity reduction Rate
Taking a part of the base slurry, stirring for 10min by a high-speed stirrer, measuring the reading of 100r/min by a rotational viscometer, wherein the value is within 50 +/-5, and otherwise, adjusting the addition of the bentonite. Adding 2.5g of sample into the other part of the base slurry, stirring for 20min by using a high-speed stirrer, and measuring the reading of 100r/min by using a rotational viscometer; respectively loading the base slurry and the test slurry into an aging tank, placing the aging tank and the test slurry into a roller heating furnace, hot rolling for 16h at 120 ℃, taking out the aging tank and cooling to room temperature, stirring at a high speed for 20min, measuring the reading of 100r/min by using a rotational viscometer, and then calculating the viscosity reduction rate at normal temperature and high temperature according to the formulas (1) and (2).
In the formula:
rho-represents the normal-temperature viscosity reduction rate,%;
rho' - -represents the high temperature viscosity reduction rate,%;
the test results for examples 1-15 are shown in Table 1.
TABLE 1
The description and applications of the present invention are illustrative, and not intended to limit the scope of the invention to the embodiments described above, therefore, the present invention is not limited by the embodiments, and any technical solutions obtained by equivalent substitution are within the scope of the present invention.
Claims (4)
1. The environment-friendly polyamino acid viscosity reducer for the drilling fluid is characterized by comprising the following raw materials in parts by weight: 30-35 parts of amino acid A, 10-13 parts of amino acid B, 10-15 parts of catalyst, 20-25 parts of sodium hydroxide, 15-20 parts of initiator and 100-120 parts of water; the amino acid A is an acidic amino acid, and the amino acid B comprises a basic amino acid or a polar neutral amino acid;
wherein the acidic amino acid is one of L-aspartic acid and glutamic acid;
the basic amino acid is one of lysine and arginine, and the polar neutral amino acid is one of asparagine and glutamine;
the initiator is amino acid C, and the amino acid C is amino acid containing an aromatic ring structure; the amino acid containing the aromatic ring structure is selected from one of phenylalanine, tryptophan and tyrosine;
the preparation method of the environment-friendly polyamino acid viscosity reducer for the drilling fluid comprises the following steps:
(1) adding amino acid A, a catalyst and 5-10 parts of water into a reaction kettle in sequence, and reacting for 2-5 hours at 170-200 ℃;
(2) adding amino acid B into the reaction kettle in the step 1, and reacting for 2-5 h at 170-200 ℃ to obtain an intermediate;
(3) dissolving the intermediate obtained in the reaction kettle in the step 2 in the residual water, keeping the temperature at 10-60 ℃, adding an initiator, and stirring for reaction for 2-5 hours;
(4) and (3) adding sodium hydroxide into the reaction kettle in the step (3), and adjusting the pH value to 8-11 to obtain the polyamino acid viscosity reducer.
2. The environment-friendly polyamino acid viscosity reducer for drilling fluid as claimed in claim 1, wherein the weight ratio of amino acid A, amino acid B and initiator is (2-4): (0.5-1.5): (0.5-2).
3. The environment-friendly polyamino acid viscosity reducer for drilling fluid as claimed in claim 1, wherein the weight ratio of amino acid A, amino acid B and initiator is (2.5-3.5): 1: (1.3-1.8).
4. The environment-friendly polyamino acid viscosity reducer for drilling fluid as claimed in claim 1, wherein the amino acid B is lysine.
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