CN111410949A - Integrated viscosity-changing, salt-resistant and resistance-reducing agent and preparation method thereof - Google Patents
Integrated viscosity-changing, salt-resistant and resistance-reducing agent and preparation method thereof Download PDFInfo
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- CN111410949A CN111410949A CN202010321567.4A CN202010321567A CN111410949A CN 111410949 A CN111410949 A CN 111410949A CN 202010321567 A CN202010321567 A CN 202010321567A CN 111410949 A CN111410949 A CN 111410949A
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- 125000002091 cationic group Chemical group 0.000 claims description 2
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims description 2
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- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 2
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- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 claims description 2
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- 229910052901 montmorillonite Inorganic materials 0.000 claims description 2
- 229920001568 phenolic resin Polymers 0.000 claims description 2
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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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/66—Compositions based on water or polar solvents
- C09K8/68—Compositions based on water or polar solvents containing organic compounds
- C09K8/685—Compositions based on water or polar solvents containing organic compounds containing cross-linking agents
-
- 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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
- C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/887—Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
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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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
- C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/90—Compositions based on water or polar solvents containing organic compounds macromolecular compounds of natural origin, e.g. polysaccharides, cellulose
- C09K8/905—Biopolymers
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Colloid Chemistry (AREA)
Abstract
The invention provides an integrated viscosity-changing, salt-tolerant and resistance-reducing agent and a preparation method thereof, and solves the technical problems that a thickening agent in the prior art cannot simultaneously have on-line mixing, high resistance reduction, high salt resistance, high sand carrying capacity and strong viscosity-changing capacity. It comprises water-soluble thickening agents: 20-60 parts; in-situ crosslinking agent: 5-10 parts; 30.6 to 73 portions of solvent; suspension aid: 0.2 to 1.5 portions; suspending agent: 0.5 to 3 parts; surfactant (b): 0.5 to 4 parts; water: 10 to 20 portions. The integrated viscosity-changing salt-resistant resistance-reducing agent provided by the invention not only has the characteristics of high resistance reduction, high salt resistance, high sand carrying capacity, variable viscosity and more environmental protection, but also can realize integrated operation and realize on-line blending.
Description
Technical Field
The invention relates to a resistance reducing agent for a fracturing fluid, in particular to an integrated viscosity-changing salt-resistant resistance reducing agent and a preparation method thereof.
Background
The shale oil and gas development in China faces the problems of land shortage, deep burial, water resource shortage, large environmental protection pressure and the like. Horizontal well fracture network fracturing is a key technology for efficient exploration and development of deep shale oil gas, and slickwater fracturing fluid is an important carrier and implementation means of the technology. The current slickwater system has limited use effect, and particularly, with development of shale oil gas, deep army is entered, the flowback liquid is repeatedly used for unlimited times, and the like, extremely high requirements are provided for the technology:
① the oil and gas reservoir has deep burial, complex geological condition, high construction pressure and difficult sand adding, and puts forward the technical requirements of high drag reduction rate and real-time viscosity change;
② the flowback liquid of the fracturing fluid is recycled for many times, the mineralization is continuously increased, the composition is abnormal and complex, the recycled fracturing is large, and more salt-resistant products are needed;
③ the existing product is mainly reverse emulsion, oil-based products are seriously emulsified and highly damaged, the fracturing fluid has more flowback fluid, is difficult to treat and has high treatment cost, and more environment-friendly products are needed;
④, the effectiveness of improving the crack by adopting the variable viscous fracturing fluid operation is improved, the operation cost is reduced and the operation efficiency is improved by integrated online preparation;
⑤ the fracturing fluid is prepared by adopting clear water, the use cost of the water is high, and the water source is difficult to find.
The integrated variable-viscosity salt-resistant resistance reducing agent which has high resistance reducing performance, high salt resistance, high sand carrying performance, variable viscosity, more environmental protection and multiple functions is urgently needed, and integrated operation is realized. The liquid type resistance reducing agent prepared by emulsion polymerization can realize integrated online operation, is limited by an emulsion polymerization process, has low effective content, has far lower resistance reducing, salt resistance, sand carrying and viscosity changing capabilities than an aqueous solution powder thickening agent, and has serious oil phase damage during use due to a large amount of oil and surfactant in the formula; the powder type resistance reducing agent is easy to contact with water when preparing the fracturing fluid to generate the problem of forming fish eyes due to insufficient dispersibility, and has the conditions of difficult online metering, high requirement on filling equipment and no online integrated operation.
The powdery salt-tolerant resistance-reducing agent is prepared into stable suspension, the advantages of inverse emulsion and the powdery resistance-reducing agent are combined to realize integrated operation, the suspension is prepared in the fields of medicine and pesticide, the suspension mainly comprises inorganic materials and non-water-soluble media and does not relate to the suspension of water-soluble thickening agent particles, and the inverse emulsion is mainly applied to oil fields or the powdery resistance-reducing agent is directly used for liquid preparation.
Disclosure of Invention
The invention aims to provide an integrated viscosity-changing, salt-resistant and resistance-reducing agent capable of being mixed on line and a preparation method thereof. The technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the invention are described in detail in the following.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides an integrated viscosity-changing, salt-resistant and resistance-reducing agent, which is prepared from the following raw materials in parts by weight:
water-soluble thickener: 20-60 parts;
in-situ crosslinking agent: 5-10 parts;
30.6 to 73 portions of solvent;
suspension aid: 0.2 to 1.5 portions;
suspending agent: 0.5 to 3 parts;
surfactant (b): 0.5 to 4 parts;
water: 10 to 20 portions.
Further, the weight parts of the raw materials are respectively as follows:
water-soluble thickener: 30-50 parts;
in-situ crosslinking agent: 6-9 parts;
40 to 60 portions of solvent;
suspension aid: 0.6 to 1.2 portions;
suspending agent: 1.2 to 2.2 parts;
surfactant (b): 1.5 to 3 parts;
water: 12 to 18 portions.
Further, the weight parts of the raw materials are respectively as follows:
water-soluble thickener: 40 parts of a mixture;
in-situ crosslinking agent: 7.5 parts;
50 parts of a solvent;
suspension aid: 0.9 part;
suspending agent: 1.8 parts;
surfactant (b): 2 parts of (1);
water: 15 parts.
Further, the water-soluble thickening agent is any one or more of a homopolymer of acrylamide, a copolymer of acrylamide, a homopolymer of methacrylamide and a copolymer of methacrylamide; and the molecular weight of the water-soluble thickening agent is 500-3000 ten thousand.
Further, the solvent comprises a solvent A and a solvent B; the solvent A is an amide or an alcohol amine; the solvent B is polyalcohol; the weight ratio of the solvent A to the solvent B is 0.6-3: 30-70 parts of;
the in-situ cross-linking agent is water-soluble phenolic resin.
Further, the suspension auxiliary agent is any one or more of low molecular polymer, carboxymethyl cellulose, hydroxypropyl methyl cellulose, polyurethane thickener, algin, xanthan gum and polyvinylpyrrolidone; the low molecular polymer is any one or more of homopolymer and copolymer of acrylonitrile, maleic acid, styrene, butadiene, isoprene and isoprene, and the molecular weight of the low molecular polymer is 2-10 ten thousand.
Further, the suspending agent is any one or more of fumed silica, bentonite, montmorillonite, polyamide wax and polyethylene wax.
Further, the surfactant is any one or more of a fluorocarbon surfactant, a sorbitan fatty acid ester and a polyoxyethylene sorbitan fatty acid ester;
the fluorocarbon surfactant is any one or more of modified cationic fluorocarbon, modified anionic fluorocarbon, modified nonionic fluorocarbon and modified zwitterionic fluorocarbon;
the sorbitan fatty acid ester is one or more of span 60, span 65 and span 80;
the polyoxyethylene sorbitan fatty acid ester is one or more of tween 20, tween 40, tween 60 and tween 80.
The invention provides a preparation method of an integrated viscosity-changing, salt-resistant and resistance-reducing agent, which comprises the following steps:
s1: respectively adding water, a suspension auxiliary agent and a surfactant into a reaction kettle, starting stirring, and circularly shearing for 0.8-1.5 hours through an emulsification pump to obtain an X liquid; then transferring the X liquid into a high-level tank;
s2: under the conditions of keeping stirring and circular shearing, sequentially adding a solvent, a suspending agent and a water-soluble thickening agent into a reaction kettle, continuously stirring and circularly shearing for 1-2 hours through an emulsion pump to obtain Y liquid;
s3: and under the conditions of keeping stirring and circular shearing, alternately adding the X liquid and the in-situ cross-linking agent into the Y liquid, continuing stirring after the X liquid and the in-situ cross-linking agent are added, and performing circular shearing for 25-35 min through an emulsion pump to obtain a finished product.
Further, in the step S3, the liquid X and the in-situ cross-linking agent are uniformly and alternately added to the liquid Y, and the switching time for adding the liquid X and the in-situ cross-linking agent is 2-4 min; the feeding speed of the X liquid and the in-situ cross-linking agent is 100 g/min-140 g/min.
Furthermore, in the step S1, the step S2 and the step S3, the stirring speed for stirring is 60r/min to 150 r/min; the rotation speed of the emulsion pump for circular shearing is 2300 r/min-3300 r/min.
Based on the technical scheme, the embodiment of the invention can at least produce the following technical effects:
(1) the integrated viscosity-changing salt-resistant resistance-reducing agent provided by the invention prepares the salt-resistant powder type water-soluble thickening agent into stable suspension, realizes online accurate filling, and thoroughly solves the problems of slow dissolution speed and oil phase damage caused by the demulsification process of the inverse emulsion resistance-reducing agent by adopting a fully water-soluble solvent as the powder is pre-dispersed and no fish eyes are generated during liquid preparation;
(2) the integrated viscosity-changing salt-resistant resistance-reducing agent provided by the invention successfully realizes coexistence of the water-soluble powder thickening agent and water in the formula through the formula and the process, and a layer of pre-hydration layer is formed on the surface of the thickening agent due to the introduction of a certain amount of water;
(3) according to the integrated viscosity-changing salt-resistant resistance-reducing agent provided by the invention, the powder resistance-reducing agent and the in-situ cross-linking agent stably coexist by a powder suspension technology, and the viscosity can be multiplied after the cross-linking agent and the thickening agent are cross-linked; on one hand, a salt-tolerant powder thickening agent is selected, and on the other hand, the salt-tolerant capability and the viscosity-changing capability of the powder thickening agent are further improved through interaction with a cross-linking agent, so that the viscosity of the powder thickening agent is more sensitively adjusted and the adjustable range of the powder thickening agent is wider, a novel integrated viscosity-changing salt-tolerant resistance-reducing agent is formed, and integrated operation can be realized; the integrated viscosity-changing salt-resistant resistance-reducing agent provided by the invention has the characteristics of high resistance reduction, high salt resistance, high sand carrying and environmental protection, the pre-coexistence of the in-situ cross-linking agent and the water-soluble thickening agent has a wider viscosity-changing range, and meanwhile, the liquid preparation and the rapid hydration and thickening agent can be mixed on line to realize integrated operation.
(4) The integrated viscosity-changing salt-resistant resistance-reducing agent provided by the invention can be directly prepared into fracturing fluid when in use, and compared with the existing resistance-reducing water and glue solution composite fracturing fluid system, the aqueous resistance-reducing agent in the fracturing fluid system is self-crosslinked, so that the process of adding a crosslinking agent is omitted; the viscosity change has timely response and wide viscosity adjusting range, the switching of slick water, linear glue and cross-linked glue is realized through the viscosity change, the continuous mixing can be realized, the number of field liquid storage tank groups is reduced, the liquid preparation process can be simplified during the fracturing construction, and the cost is greatly saved.
(5) The integrated viscosity-changing salt-resistant resistance-reducing agent provided by the invention has the characteristic of high salt resistance, and can adopt seawater to prepare fracturing fluid near the seaside, so that the use cost of a water source is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram showing the temperature resistance and shear resistance in the experimental examples of the present invention;
FIG. 2 is a schematic diagram of the determination of resistivity reduction by deionized water solution preparation in the experimental example of the present invention;
FIG. 3 is a schematic diagram of the resistance reduction rate measured by using 3% KC L aqueous solution in the experimental example of the present invention;
FIG. 4 is a construction curve of the on-site variable-viscosity fracturing of slickwater systems with different viscosities and linear glue and cross-linked glue in the experimental example of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
First, preparation example:
example 1:
preparing an integrated viscosity-changing, salt-resistant and resistance-reducing agent:
1.1 raw materials:
the raw materials are shown in the following table 1 in parts by weight:
table 1 example 1 raw material table
1.2 the preparation method comprises the following steps:
the method comprises the following steps:
s1: respectively adding water, a suspension auxiliary agent and a surfactant into a reaction kettle, starting stirring, and circularly shearing for 1h through an emulsion pump to obtain an X liquid; then transferring the X liquid into a high-level tank;
the stirring speed for stirring is 105 r/min; the rotating speed for carrying out the cyclic shearing is 2800 r/min;
s2: under the conditions of keeping stirring and circular shearing, sequentially adding a solvent, a suspending agent and a water-soluble thickening agent into a reaction kettle, continuously stirring and circularly shearing for 2 hours through an emulsion pump to obtain Y liquid;
the stirring speed for stirring is 105 r/min; the rotating speed for carrying out the cyclic shearing is 2800 r/min;
s3: uniformly and alternately adding the X liquid and the in-situ cross-linking agent into the Y liquid under the conditions of keeping stirring and circular shearing, wherein the adding switching time of the X liquid and the in-situ cross-linking agent is 3 min; the feeding speed of the liquid X and the in-situ cross-linking agent is 120 g/min; after the liquid X and the in-situ cross-linking agent are added, the mixture is subjected to cyclic shearing for 30min to obtain an integrated finished product of the viscosity-changing, salt-resistant and resistance-reducing agent;
the stirring speed for stirring is 105 r/min; the rotational speed for the cyclic shearing was 2800 r/min.
Example 2:
preparing an integrated viscosity-changing, salt-resistant and resistance-reducing agent:
2.1, raw materials:
the raw materials are shown in the following table 2 in parts by weight:
table 2 example 2 raw material table
2.2 the preparation method comprises the following steps:
the method comprises the following steps:
s1: respectively adding water, a suspension auxiliary agent and a surfactant into a reaction kettle, starting stirring, and circularly shearing for 1h through an emulsion pump to obtain an X liquid; then transferring the X liquid into a high-level tank;
the stirring speed for stirring is 60 r/min; the rotating speed for carrying out the cyclic shearing is 3300 r/min;
s2: under the conditions of keeping stirring and circular shearing, sequentially adding a solvent, a suspending agent and a water-soluble thickening agent into a reaction kettle, continuously stirring and circularly shearing for 2 hours through an emulsion pump to obtain Y liquid;
the stirring speed for stirring is 60 r/min; the rotating speed for carrying out the cyclic shearing is 3300 r/min;
s3: uniformly and alternately adding the X liquid and the in-situ cross-linking agent into the Y liquid under the conditions of keeping stirring and circular shearing, wherein the adding switching time of the X liquid and the in-situ cross-linking agent is 3 min; the feeding speed of the liquid X and the in-situ cross-linking agent is 120 g/min; after the liquid X and the in-situ cross-linking agent are added, the mixture is subjected to cyclic shearing for 30min to obtain an integrated finished product of the viscosity-changing, salt-resistant and resistance-reducing agent;
the stirring speed for stirring is 60 r/min; the rotation speed for cyclic shearing is 3300 r/min.
Example 3:
preparing an integrated viscosity-changing, salt-resistant and resistance-reducing agent:
3.1 raw materials:
the raw materials are shown in the following table 3 in parts by weight:
table 3 example 3 table of raw materials
3.2 the preparation method comprises the following steps:
the method comprises the following steps:
s1: respectively adding water, a suspension auxiliary agent and a surfactant into a reaction kettle, starting stirring, and circularly shearing for 0.8h through an emulsion pump to obtain an X liquid; then transferring the X liquid into a high-level tank;
the stirring speed for stirring is 150 r/min; the rotating speed for carrying out the circular shearing is 2300 r/min;
s2: under the conditions of keeping stirring and circular shearing, sequentially adding a solvent, a suspending agent and a water-soluble thickening agent into a reaction kettle, continuously stirring and circularly shearing for 1h through an emulsion pump to obtain Y liquid;
the stirring speed for stirring is 150 r/min; the rotating speed for carrying out the circular shearing is 2300 r/min;
s3: uniformly and alternately adding the X liquid and the in-situ cross-linking agent into the Y liquid under the conditions of keeping stirring and circular shearing, wherein the adding switching time of the X liquid and the in-situ cross-linking agent is 2 min; the feeding speed of the X liquid and the in-situ cross-linking agent is 100 g/min; after the liquid X and the in-situ cross-linking agent are added, the material is circularly sheared for 25min, and an integrated finished product of the variable-viscosity salt-resistant resistance-reducing agent is obtained;
the stirring speed for stirring is 150 r/min; the rotating speed for carrying out the cyclic shearing is 2300 r/min.
Example 4:
preparing an integrated viscosity-changing, salt-resistant and resistance-reducing agent:
4.1 raw materials:
the raw materials are shown in the following table 4 in parts by weight:
table 4 example 4 raw material table
4.2 the preparation method comprises the following steps:
the method comprises the following steps:
s1: respectively adding water, a suspension auxiliary agent and a surfactant into a reaction kettle, starting stirring, and circularly shearing for 1.5 hours through an emulsification pump to obtain an X liquid; then transferring the X liquid into a high-level tank;
the stirring speed for stirring is 120 r/min; the rotating speed for carrying out the cyclic shearing is 3200 r/min;
s2: under the conditions of keeping stirring and circular shearing, sequentially adding a solvent, a suspending agent and a water-soluble thickening agent into a reaction kettle, continuously stirring and circularly shearing for 2 hours through an emulsion pump to obtain Y liquid;
the stirring speed for stirring is 120 r/min; the rotating speed for carrying out the cyclic shearing is 3200 r/min;
s3: uniformly and alternately adding the X liquid and the in-situ cross-linking agent into the Y liquid under the conditions of keeping stirring and circular shearing, wherein the adding switching time of the X liquid and the in-situ cross-linking agent is 4 min; the feeding speed of the X liquid and the in-situ cross-linking agent is 140 g/min; after the liquid X and the in-situ cross-linking agent are added, the mixture is circularly sheared for 35min, and an integrated finished product of the viscosity-changing, salt-resistant and resistance-reducing agent is obtained;
the stirring speed for stirring is 120 r/min; the rotating speed for carrying out the cyclic shearing is 3200 r/min.
Example 5:
preparing an integrated viscosity-changing, salt-resistant and resistance-reducing agent:
5.1, raw materials:
the raw materials are shown in the following table 5 in parts by weight:
table 5 example 5 table of raw materials
5.2 the preparation method comprises the following steps:
the method comprises the following steps:
s1: respectively adding water, a suspension auxiliary agent and a surfactant into a reaction kettle, starting stirring, and circularly shearing for 1.2 hours through an emulsification pump to obtain an X liquid; then transferring the X liquid into a high-level tank;
the stirring speed for stirring is 75 r/min; the rotating speed for carrying out the circular shearing is 2500 r/min;
s2: under the conditions of keeping stirring and circular shearing, sequentially adding a solvent, a suspending agent and a water-soluble thickening agent into a reaction kettle, continuously stirring and circularly shearing for 1.5 hours through an emulsion pump to obtain Y liquid;
the stirring speed for stirring is 75 r/min; the rotating speed for carrying out the circular shearing is 2500 r/min;
s3: uniformly and alternately adding the X liquid and the in-situ cross-linking agent into the Y liquid under the conditions of keeping stirring and circular shearing, wherein the adding switching time of the X liquid and the in-situ cross-linking agent is 3 min; the feeding speed of the liquid X and the in-situ cross-linking agent is 120 g/min; after the liquid X and the in-situ cross-linking agent are added, the mixture is subjected to cyclic shearing for 30min to obtain an integrated finished product of the viscosity-changing, salt-resistant and resistance-reducing agent;
the stirring speed for stirring is 75 r/min; the rotating speed for carrying out the circular shearing is 2500 r/min; .
Example 6:
preparing an integrated viscosity-changing, salt-resistant and resistance-reducing agent:
6.1 raw materials:
the following raw materials in parts by weight are shown in table 6:
table 6 example 6 raw material table
6.2 the preparation method comprises the following steps: the same as in example 1.
Example 7:
preparing an integrated viscosity-changing, salt-resistant and resistance-reducing agent:
7.1 raw materials:
the raw materials are shown in the following table 7 in parts by weight:
table 7 example 7 raw material table
7.2 the preparation method comprises the following steps: the same as in example 1.
Example 8:
preparing an integrated viscosity-changing, salt-resistant and resistance-reducing agent:
8.1 raw materials:
the raw materials are shown in the following table 8 in parts by weight:
table 8 example 8 raw material table
8.2 the preparation method comprises the following steps: the same as in example 1.
Example 9:
preparing an integrated viscosity-changing, salt-resistant and resistance-reducing agent:
9.1 raw materials:
the raw materials are shown in the following table 9 in parts by weight:
table 9 example 9 raw material table
9.2 the preparation method comprises the following steps: the same as in example 1.
Example 10:
preparing an integrated viscosity-changing, salt-resistant and resistance-reducing agent:
10.1, raw materials:
the raw materials are shown in the following table 10 in parts by weight:
table 10 example 10 raw material table
10.2 the preparation method comprises the following steps: the same as in example 1.
Example 11:
preparing an integrated viscosity-changing, salt-resistant and resistance-reducing agent:
11.1 raw materials:
the raw materials are shown in the following table 11 in parts by weight:
table 11 example 11 raw material table
11.2 the preparation method comprises the following steps: the same as in example 1.
Example 12:
preparing an integrated viscosity-changing, salt-resistant and resistance-reducing agent:
12.1 raw materials:
the raw materials are shown in the following table 12 in parts by weight:
table 12 example 12 raw material table
12.2 the preparation method comprises the following steps: the same as in example 1.
Example 13:
preparing an integrated viscosity-changing, salt-resistant and resistance-reducing agent:
13.1 raw materials:
the raw materials are shown in the following table 13 in parts by weight:
table 13 example 13 raw material table
13.2 the preparation method comprises the following steps: the same as in example 1.
Example 14:
preparing an integrated viscosity-changing, salt-resistant and resistance-reducing agent:
14.1 raw materials:
the raw materials are shown in the following table 14 in parts by weight:
table 14 example 14 raw material table
14.2 the preparation method comprises the following steps: the same as in example 1.
Example 15:
preparing an integrated viscosity-changing, salt-resistant and resistance-reducing agent:
15.1 raw materials:
the raw materials are shown in the following table 15 in parts by weight:
table 15 example 15 raw material table
15.2 the preparation method comprises the following steps: the same as in example 1.
Second, experimental example:
1. the performance of the integrated viscosity-changing salt-resistant resistance-reducing agent prepared in the examples 1 to 15 is tested, and the integrated viscosity-changing salt-resistant resistance-reducing agent prepared in the examples 1 to 15 is sequentially recorded as: sample 1, sample 2, sample 3, sample 4, sample 5, sample 6, sample 7, sample 8, sample 9, sample 10, sample 11, sample 12, sample 13, sample 14, sample 15; the test results are shown in table 16 below:
1) and stability of the composition
The test method comprises the following steps: 10ml of the resistance reducing agent samples prepared in examples 1 to 15 were placed in a centrifuge tube, centrifuged at 3000r/min for 1 hour, the height of the supernatant was recorded, and the ratio of the height of the precipitated supernatant (i.e., the precipitation density) was calculated.
2) Time to tack
The test method comprises the following steps: 200ml of deionized water was added to 500ml beakers, and then stirred manually, and 0.2ml of the resistance reducing agent samples prepared in examples 1 to 15 was added, and the tack-up time after the addition of the resistance reducing agent was recorded (the tack-up phenomenon was clearly felt during stirring, and the glass rod could be drawn).
3) Tackifying performance
The test method comprises the following steps: stirring deionized water at 600r/min, respectively adding a certain amount of the resistance reducing agent samples prepared in examples 1-15, testing the viscosity of the resistance reducing agent samples added for 2min, and measuring the viscosity for 170s by using a capillary viscometer or a six-speed viscometer-1Lower viscosity.
TABLE 16 sample Performance test results
2. Comparative experiment:
comparative example 1: comparative sample 1 was obtained in the same manner as in example 1 except that the in-situ crosslinking agent was not added.
Conventional emulsions: conventional inverse emulsion (FR-WH produced by Solvay).
The viscosity increasing ability, salt tolerance ability and resistance reducing ability of the integrated viscosity-changing salt-tolerant resistance reducing agent (sample 1) prepared in comparative example 1, comparative sample 1 and the conventional inverse emulsion are as follows:
1) the temperature resistance and shear resistance of the integrated viscosity-changing, salt-tolerant and resistance-reducing agent (sample 1) prepared in the example 1, the comparative sample 1 and the conventional inverse emulsion are tested under the condition of 0.2% of deionized water preparation without adding a cross-linking agent; the test results are shown in table 17 and fig. 1:
2) the sticking and viscosity conditions of the integrated sticking salt-tolerant resistance-reducing agent prepared in example 1 (sample 1), the integrated sticking salt-tolerant resistance-reducing agent prepared in example 3 (sample 3), the comparative sample 1 and the conventional inverse emulsion are tested, specifically, the sticking and viscosity conditions (viscosity at sticking) when 0.1% of sample is prepared by using deionized water and 3% of KCl aqueous solution are shown in Table 17:
3) the resistance reducing rate of the integrated viscosity-change salt-resistant resistance-reducing agent prepared in the test example 1 (sample 1), the comparative sample 1 and the conventional inverse emulsion (performed according to the specification of determination of the resistance reducing rate in SY/T6376-2008, chapter 7.13.1.1) are shown in fig. 2:
TABLE 17 tack and viscosity contrast Properties
As shown in fig. 1, sample 1 prepared in example 1 has better temperature resistance and shear resistance than comparative sample 1 prepared in comparative example 1 and the conventional inverse emulsion, has better viscosity-changing effect due to self-crosslinking, and has further viscosity-increasing effect after entering a well and raising the temperature, which is helpful for improving the carrying capacity of the liquid proppant.
As shown in table 17, fig. 2, and fig. 3, sample 1 prepared in example 1 has significant advantages in viscosity and resistance reduction rate over conventional emulsions, and saline has little influence on viscosity increase and resistance reduction rate, and has high salt tolerance and high resistance reduction characteristics.
3. The integrated viscosity-variable salt-resistant resistance-reducing agent (sample 1) prepared in example 1 was freely switched and used as slickwater, linear adhesive and crosslinking adhesive.
As shown in fig. 4, a sand fracturing construction graph of a construction site is shown.
①, the slickwater comprises, in mass percent, 0.04% to 0.2% of sample 1;
② in mass percent, the linear gum comprises sample 1 at 0.15% to 0.4%;
③ wt%, the cross-linked glue comprises 0.2-0.5% of sample 1, and the self-crosslinking effect is further enhanced by the temperature rise process.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention.
Claims (10)
1. An integrated viscosity-changing, salt-resistant and resistance-reducing agent is characterized in that: the preparation method comprises the following raw materials in parts by weight:
water-soluble thickener: 20-60 parts;
in-situ crosslinking agent: 5-10 parts;
30.6 to 73 portions of solvent;
suspension aid: 0.2 to 1.5 portions;
suspending agent: 0.5 to 3 parts;
surfactant (b): 0.5 to 4 parts;
water: 10 to 20 portions.
2. The integrated viscosity-changing, salt-resistant and resistance-reducing agent according to claim 1, characterized in that: the weight parts of the raw materials are respectively as follows:
water-soluble thickener: 30-50 parts;
in-situ crosslinking agent: 6-9 parts;
40 to 60 portions of solvent;
suspension aid: 0.6 to 1.2 portions;
suspending agent: 1.2 to 2.2 parts;
surfactant (b): 1.5 to 3 parts;
water: 12 to 18 portions.
3. The integrated viscosity-changing, salt-resistant and resistance-reducing agent according to claim 2, characterized in that: the weight parts of the raw materials are respectively as follows:
water-soluble thickener: 40 parts of a mixture;
in-situ crosslinking agent: 7.5 parts;
50 parts of a solvent;
suspension aid: 0.9 part;
suspending agent: 1.8 parts;
surfactant (b): 2 parts of (1);
water: 15 parts.
4. The integrated viscosity-changing, salt-resistant and resistance-reducing agent as claimed in any one of claims 1 to 3, wherein: the water-soluble thickening agent is any one or more of a homopolymer of acrylamide, a copolymer of acrylamide, a homopolymer of methacrylamide and a copolymer of methacrylamide; and the molecular weight of the water-soluble thickening agent is 500-3000 ten thousand.
5. The integrated viscosity-changing, salt-resistant and resistance-reducing agent according to claim 4, characterized in that: the solvent comprises a solvent A and a solvent B; the solvent A is an amide or an alcohol amine; the solvent B is polyalcohol; the weight ratio of the solvent A to the solvent B is 0.6-3: 30-70 parts of;
the in-situ cross-linking agent is water-soluble phenolic resin.
6. The integrated viscosity-changing, salt-resistant and resistance-reducing agent according to claim 5, characterized in that: the suspension auxiliary agent is any one or more of low molecular polymer, carboxymethyl cellulose, hydroxypropyl methyl cellulose, polyurethane thickener, seaweed gel, xanthan gum and polyvinylpyrrolidone; the low molecular polymer is any one or more of homopolymer and copolymer of acrylonitrile, maleic acid, styrene, butadiene, isoprene and isoprene, and the molecular weight of the low molecular polymer is 2-10 ten thousand.
7. The integrated viscosity-changing, salt-resistant and resistance-reducing agent according to claim 6, characterized in that: the suspending agent is any one or more of fumed silica, bentonite, montmorillonite, polyamide wax and polyethylene wax.
8. The integrated viscosity-changing, salt-resistant and resistance-reducing agent according to claim 7, characterized in that: the surfactant is one or more of fluorocarbon surfactant, sorbitan fatty acid ester and polyoxyethylene sorbitan fatty acid ester;
the fluorocarbon surfactant is any one or more of modified cationic fluorocarbon, modified anionic fluorocarbon, modified nonionic fluorocarbon and modified zwitterionic fluorocarbon;
the sorbitan fatty acid ester is one or more of span 60, span 65 and span 80;
the polyoxyethylene sorbitan fatty acid ester is one or more of tween 20, tween 40, tween 60 and tween 80.
9. The preparation method of the integrated viscosity-changing, salt-resistant and resistance-reducing agent according to any one of claims 1 to 8, characterized in that: the method comprises the following steps:
s1: respectively adding water, a suspension auxiliary agent and a surfactant into a reaction kettle, starting stirring, and circularly shearing for 0.8-1.5 hours through an emulsification pump to obtain an X liquid; then transferring the X liquid into a high-level tank;
s2: under the conditions of keeping stirring and circular shearing, sequentially adding a solvent, a suspending agent and a water-soluble thickening agent into a reaction kettle, continuously stirring and circularly shearing for 1-2 hours through an emulsion pump to obtain Y liquid;
s3: and under the conditions of keeping stirring and circular shearing, alternately adding the X liquid and the in-situ cross-linking agent into the Y liquid, continuing stirring after the X liquid and the in-situ cross-linking agent are added, and performing circular shearing for 25-35 min through an emulsion pump to obtain a finished product.
10. The integrated viscosity-changing, salt-resistant and resistance-reducing agent preparation method according to claim 9, characterized in that: in the step S3, the X liquid and the in-situ cross-linking agent are uniformly and alternately added into the Y liquid, and the switching time of the addition of the X liquid and the addition of the in-situ cross-linking agent is 2-4 min; the feeding speed of the X liquid and the in-situ cross-linking agent is 100 g/min-140 g/min.
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Application publication date: 20200714 Assignee: SHENGLI OIL FIELD FANGYUAN CHEMICAL INDUSTRY Co.,Ltd. Assignor: CHENGDU LEARN-PRACTICES TECHNOLOGY Co.,Ltd.|SOUTHWEST PETROLEUM University Contract record no.: X2022510000063 Denomination of invention: An integrated variable viscosity, salt resistance and resistance reducing agent and its preparation method Granted publication date: 20210226 License type: Common License Record date: 20221229 |