CN111471446A - Sand control agent for fracturing and application method thereof - Google Patents
Sand control agent for fracturing and application method thereof Download PDFInfo
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- CN111471446A CN111471446A CN202010285669.5A CN202010285669A CN111471446A CN 111471446 A CN111471446 A CN 111471446A CN 202010285669 A CN202010285669 A CN 202010285669A CN 111471446 A CN111471446 A CN 111471446A
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- 239000004576 sand Substances 0.000 title claims abstract description 108
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 15
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000000084 colloidal system Substances 0.000 claims abstract description 25
- 239000000919 ceramic Substances 0.000 claims abstract description 21
- 239000000835 fiber Substances 0.000 claims abstract description 21
- 238000003756 stirring Methods 0.000 claims abstract description 17
- POULHZVOKOAJMA-UHFFFAOYSA-N dodecanoic acid Chemical compound CCCCCCCCCCCC(O)=O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000011159 matrix material Substances 0.000 claims abstract description 16
- IMNIMPAHZVJRPE-UHFFFAOYSA-N triethylenediamine Chemical compound C1CN2CCN1CC2 IMNIMPAHZVJRPE-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000005062 Polybutadiene Substances 0.000 claims abstract description 11
- 229920002857 polybutadiene Polymers 0.000 claims abstract description 11
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 229920002818 (Hydroxyethyl)methacrylate Polymers 0.000 claims abstract description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 8
- WOBHKFSMXKNTIM-UHFFFAOYSA-N Hydroxyethyl methacrylate Chemical compound CC(=C)C(=O)OCCO WOBHKFSMXKNTIM-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000005639 Lauric acid Substances 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 4
- 238000012360 testing method Methods 0.000 claims description 14
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 3
- 230000006837 decompression Effects 0.000 claims 1
- 238000011946 reduction process Methods 0.000 claims 1
- 239000010419 fine particle Substances 0.000 abstract description 5
- 239000007790 solid phase Substances 0.000 abstract description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 79
- 230000000052 comparative effect Effects 0.000 description 9
- 239000007789 gas Substances 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 7
- 239000000243 solution Substances 0.000 description 6
- 239000002245 particle Substances 0.000 description 5
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 4
- 239000003245 coal Substances 0.000 description 4
- 239000006004 Quartz sand Substances 0.000 description 3
- 230000002579 anti-swelling effect Effects 0.000 description 3
- 239000012267 brine Substances 0.000 description 3
- 239000002817 coal dust Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 3
- 239000004952 Polyamide Substances 0.000 description 2
- 230000003321 amplification Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 229920002647 polyamide Polymers 0.000 description 2
- 235000011164 potassium chloride Nutrition 0.000 description 2
- 239000001103 potassium chloride Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000004931 aggregating effect Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 239000002120 nanofilm Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 238000009777 vacuum freeze-drying Methods 0.000 description 1
Classifications
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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
- C09K8/64—Oil-based compositions
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F279/00—Macromolecular compounds obtained by polymerising monomers on to polymers of monomers having two or more carbon-to-carbon double bonds as defined in group C08F36/00
- C08F279/02—Macromolecular compounds obtained by polymerising monomers on to polymers of monomers having two or more carbon-to-carbon double bonds as defined in group C08F36/00 on to polymers of conjugated dienes
-
- 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
- C09K8/70—Compositions for forming crevices or fractures characterised by their form or by the form of their components, e.g. foams
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Organic Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Polymers & Plastics (AREA)
- Medicinal Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Geochemistry & Mineralogy (AREA)
- Oil, Petroleum & Natural Gas (AREA)
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Abstract
The invention discloses a sand control agent for fracturing, which is prepared by the following steps: step 1) dissolving butadiene rubber in toluene, adding hydroxyethyl methacrylate, stirring, adding azobisisoheptonitrile, and stirring to obtain a sand control matrix; step 2), preparing ceramic fibers into nano-grade ceramic fibers, and dispersing the nano-grade ceramic fibers in the sand control matrix to form a sand control colloid; step 3) heating the sand control colloid, and introducing nitrogen into the sand control colloid to form a pressurized sand control colloid; and 4) adding lauric acid into the pressurized sand control colloid, adding triethylene diamine, and cooling and decompressing to obtain the sand control agent. The invention also discloses an application method of the sand control agent for fracturing. The invention can effectively gather fine particle solid phase, improve the flow conductivity and improve the productivity.
Description
Technical Field
The invention relates to petroleum engineering. More particularly, the invention relates to a sand control agent for fracturing and an application method thereof.
Background
In the process of oil field exploitation, coal dust and fine silt particles are blocked in a near-well zone of a reservoir, seepage capability is rapidly reduced, and single crystal yield is reduced. In the prior art, resin sand control agents are generally adopted, but the damage to the bottom layer is large, and the problems of blockage and capacity cannot be fundamentally solved.
Disclosure of Invention
An object of the present invention is to solve at least the above problems and to provide at least the advantages described later.
It is still another object of the present invention to provide a sand control agent for fracturing and a method for using the same, which can effectively aggregate fine particle solid phase, improve conductivity, and improve productivity.
To achieve these objects and other advantages in accordance with the present invention, there is provided a sand control agent for fracturing, prepared by the steps of:
step 1) dissolving butadiene rubber in toluene to prepare a 1% by mass toluene solution of butadiene rubber, adding hydroxyethyl methacrylate, stirring, adding azobisisoheptonitrile, and stirring to obtain a sand control matrix; wherein the mass ratio of the butadiene rubber, the hydroxyethyl methacrylate and the azodiisoheptanonitrile is 1:10: 2;
step 2), preparing ceramic fibers into nano-grade ceramic fibers, and dispersing the nano-grade ceramic fibers in the sand control matrix to form a sand control colloid; wherein the mass ratio of the ceramic fiber to the sand control matrix is 1: 100;
step 3) heating the sand control colloid to 120 ℃, preserving heat, introducing nitrogen into the sand control colloid, keeping the pressure in a reaction kettle for containing the sand control colloid to be more than 1MPa, and maintaining the pressure to form a pressurized sand control colloid;
step 4) adding lauric acid into the pressurized sand control colloid, stirring, keeping the temperature and the pressure for 2 hours, adding triethylene diamine, stirring, keeping the temperature and the pressure for 2 hours, cooling to room temperature, then reducing the pressure to atmospheric pressure, and continuously stirring during the period to obtain a sand control agent; wherein the mass ratio of the ceramic fiber to the lauric acid to the triethylenediamine is 1:1: 1.
Preferably, the heating rate of step 3) is 5 ℃/min and the pressurizing rate is 0.05 MPa/s.
Preferably, the cooling process of step 4) is as follows: the temperature is reduced to 80 ℃ at the speed of 2 ℃/min, then is reduced to be lower than 40 ℃ at the speed of 4 ℃/min, and is reduced to be lower than 26 ℃ at the speed of 6 ℃/min.
Preferably, the rate of depressurization in step 4) is 0.1 MPa/s.
The application method of the sand control agent for fracturing comprises the following steps of:
step a, using an annular packer, and performing well dredging and well washing before the packer is put in;
step b, setting the packer, checking leakage and ensuring that no leakage point exists;
step c, pressure testing;
d, squeezing and injecting the sand control agent by using an oil pipe at the discharge capacity of 300L/min;
e, after the displacement is finished, unsealing the packer, and lifting the drill to go out of the well;
and f, closing the well for 24-36 h.
The application method of the sand control agent for fracturing comprises the following steps when being applied to a screw pump:
step A, squeezing the sand control agent from the annulus by using a tubing at the displacement of 300L/min without using an annulus packer;
and step B, closing the well for 24-36h after the squeezing is finished.
The invention at least comprises the following beneficial effects:
the invention effectively gathers fine particle solid phase, improves the flow conductivity, and especially improves the productivity of plunger pump and screw pump well.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Detailed Description
The present invention is further described in detail below with reference to examples to enable those skilled in the art to practice the invention with reference to the description.
It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified.
< example 1>
The sand control agent for fracturing is prepared by the following steps:
step 1) dissolving butadiene rubber in toluene to prepare a 1% by mass toluene solution of butadiene rubber, adding hydroxyethyl methacrylate, stirring, adding azobisisoheptonitrile, and stirring to obtain a sand control matrix; wherein the mass ratio of the butadiene rubber, the hydroxyethyl methacrylate and the azodiisoheptanonitrile is 1:10: 2;
step 2), preparing ceramic fibers into nano-grade ceramic fibers, and dispersing the nano-grade ceramic fibers in the sand control matrix to form a sand control colloid; wherein the mass ratio of the ceramic fiber to the sand control matrix is 1: 100;
step 3) heating the sand control colloid to 120 ℃, wherein the heating rate is 5 ℃/min, preserving heat, then introducing nitrogen into the sand control colloid, the pressurizing rate is 0.05MPa/s, keeping the pressure in a reaction kettle for containing the sand control colloid to be more than 1MPa, and maintaining the pressure to form a pressurized sand control colloid;
step 4) adding lauric acid into the pressurized sand control colloid, stirring, keeping the temperature and the pressure for 2 hours, adding triethylene diamine, stirring, keeping the temperature and the pressure for 2 hours, cooling to room temperature, wherein the cooling process is as follows: firstly, cooling to 80 ℃ at the speed of 2 ℃/min, then cooling to less than 40 ℃ at the speed of 4 ℃/min, then cooling to less than 26 ℃ at the speed of 6 ℃/min, then reducing the pressure to atmospheric pressure at the speed of 0.1MPa/s, and continuously stirring during the period to obtain the sand control agent (if a solid sand control agent is required, the step is added, namely, the step is transferred to a freeze dryer, vacuum freeze drying is carried out, and crushing is carried out to obtain a powder-state sand control agent); wherein the mass ratio of the ceramic fiber to the lauric acid to the triethylenediamine is 1:1: 1.
< example 2>
The sand control agent for fracturing prepared in example 1, when applied to a plunger pump, comprises:
step a, using an annular packer, and performing well dredging and well washing before the packer is put in;
step b, setting the packer, checking leakage and ensuring that no leakage point exists;
step c, pressure testing;
d, squeezing the sand control agent prepared in the example 1 at the discharge capacity of 300L/min by using an oil pipe;
e, after the displacement is finished, unsealing the packer, and lifting the drill to go out of the well;
and f, closing the well for 24-36 h.
When the composite material is applied to a plunger pump well, the pump efficiency is more than 90%, the yield is increased after 3 months, the water content is reduced, and the content of pulverized coal and fine silt is lower than 0.2%.
Applying the method of example 2 to the 006# well in zone a21 increased fracture bandwidth by more than 45% and oil production by 1.5t day compared to the 005# well (without squeeze of the sand control agent prepared in example 1).
< example 3>
The sand control agent for fracturing prepared in example 1, when applied to a screw pump, comprises:
step A, squeezing the sand control agent from the annulus by using a tubing at the displacement of 300L/min without using an annulus packer;
and step B, closing the well for 24-36h after the squeezing is finished.
When the sand discharging device is applied to a screw pump well, sand discharging is in a remarkably descending trend.
When the composite material is applied to a screw pump well, the pump efficiency is more than 90%, the yield is increased after 3 months, the water content is reduced, and the content of the pulverized coal and the fine silt is lower than 0.3%.
The method of example 3 was applied to the 009 well in B07 zone 009, and compared to the 008 well (the sand control agent prepared in example 1 was not squeezed out), the fracture bandwidth was increased by more than 40% and the oil production increased by 1.2t day.
< comparative example 1>
The preparation method is the same as example 1, except that the sand control matrix in the step 1) is as follows: dissolving polyamide in toluene to prepare a toluene solution of polyamide with the mass fraction of 35%.
The anti-swelling rate of the sand control agents prepared in the example 1 and the comparative example 1 is measured by using a swelling meter, the anti-swelling rate of the example 1 reaches 95%, and the anti-swelling rate of the comparative example 1 is 82%, because the butadiene rubber is dissolved in toluene to form a uniform solution, hydroxyethyl methacrylate is introduced for solid in-situ grafting modification, and azobisisoheptonitrile is introduced for initiating a reaction to obtain a sand control matrix with a plurality of cationic groups, so that the finally obtained sand control agent can be adsorbed on reservoir particles through hydrogen bonds and static electricity.
< comparative example 2>
The preparation method is the same as that of example 1, except that the ceramic fiber in the step 2) is sequentially subjected to mechanical crushing and airflow milling to reach a micron level, and is dispersed in the sand control matrix to form a sand control colloid; wherein the mass ratio of the ceramic fiber to the sand control matrix is 1: 100.
The sand control agent prepared in example 1 and comparative example 2 is carried out according to SY/T6302-2At 50 ℃, the test liquid is 2% potassium chloride solution, the flow rate is 10m L/min, the pressure is increased to 1MPa, the closing pressure is gradually increased, the flow conductivity is measured, the flow conductivity is reduced along with the increase of the closing pressure in the example 1 and the comparative example 2, when the closing pressure is 15MPa, the increase of the flow conductivity of the example 1 relative to the untreated group is 5%, and when the closing pressure is 30MPa, the increase of the flow conductivity of the example 1 relative to the untreated group is 19%, because the nano-level specific surface area of the ceramic fiber is large, the bonding force is strong, the three-dimensional net can be dispersed in the sand control matrix, the tensile stress and the bending stress are born, and the inter-particle attraction force is enhanced.
< comparative example 3>
The preparation process is the same as in example 1, except that step 3) is not included.
6% of the sand control agent prepared in the example 1 and the sand control agent prepared in the comparative example 3 are respectively added into 20/40-mesh quartz sand, the discharge capacity during the initial sand production is measured according to Q/S L CG0097-2014 molecular film sand control agent, the sand production discharge capacity of the example 1 is 100 +/-12 m L/min, and the sand production discharge capacity of the comparative example 3 is 59 +/-8 m L/min, because the stable and uniform medium is formed by the sand control colloid with pressure, lauric acid and triethylenediamine are sequentially introduced to generate polymer sodium salt with low molecular weight, the internal motion of the prepared sand control agent is realized by pressure-pressure relief, the zeta potential is adjusted to the optimal range, the transportation of fine particles is conveniently controlled at the later stage, and the adsorbed fine particles are aggregated into larger particles.
< test of flow conductivity >
The test objects are ceramsite sand: respectively placing 20/40 mesh ceramsite sand and 60/80 mesh ceramsite sand into different test tubes, and recording the initial height h of the ceramsite sand0Then the sand control agent prepared in example 1 is added, shaken and kept still, and the final height h of the ceramsite sand is recorded again1And calculating to obtain the height difference △ h-h of the ceramsite sand1-h0Wherein the initial height h of 20-40 mesh ceramsite sand is04.5cm, final height h15.1cm, height increasing amplitude of 13.3%, and initial height h of 60-80 mesh ceramsite sand04.8cm, final height h1The height is 5.5cm, the height amplification is 14.6 percent, and the sand control agent prepared in the example 1 is added, so that the height amplification of the ceramsite sand can reach more than 13 percent, and the flow conductivity is improved.
The test objects are quartz sand: different amounts (0, 20, 40, 60, 80 cm) were added to 20/40 mesh quartz sand3The sand control agent prepared in example 1 of the present invention/g) was measured to obtain brine flow rates of 368, 534, 516, 530, 522m L/min, respectively, indicating that the addition of the sand control agent prepared in example 1 can increase brine flow rate by as much as 44.0%, improving conductivity.
The test objects are fracturing sand: the sand control agent prepared in example 1 was added to 20/40 mesh fracturing sand with a sanding density of 0, 10kg/m2At 50 ℃, the test liquid is 2% potassium chloride solution, the flow rate is 10m L/min, each pressure point is measured for 2 times, the closing pressure is gradually increased, the flow conductivity between sandstone layers is measured, the flow conductivity is reduced along with the increase of the closing pressure, but the flow conductivity of the example 1 is better than that of an untreated group, wherein when the closing pressure is 15MPa, the increase of the flow conductivity of the example 1 relative to that of the untreated group is 12%, and when the closing pressure is 30MPa, the increase of the flow conductivity of the example 1 relative to that of the untreated group is 41%.
The above experiments show that the sand control agent prepared in example 1 is advantageous for forming a flow channel with high flow conductivity.
< core gas flow test >
The gas flow rate of the untreated core and the gas flow rate of the core treated in example 1 were measured, and the results showed that the gas flow rates of the untreated core were 0, 3, 8, 11, 21, 27, and 35m at 0, 30, 60, 90, 120, 150, and 180min3Permin, gas flow rates of 0, 10, 26, 38, 45, 52, 60m for cores treated with example 13Min, demonstrating that the sand control agent prepared in example 1 can improve gas production.
< core flow test >
The untreated core and the core treated in example 1 were used to simulate the flowback efficiency of the fracturing fluid, and the results showed that the cumulative brine production of the untreated core was 0, 0.8, 2.6, 5.1, 5.5, 5.9m at 0, 10, 20, 30, 40, 50, and 60min3The gas flow rates of the cores treated in example 1 were 0, 1.5, 4.4, 5.6, 6.0, 6.2, 6.6 m/min3Min, which shows that the sand control agent prepared in example 1 can improve the flowback efficiency of the fracturing fluid.
< test of aggregation Capacity of pulverized coal and Fine Sand >
Adding the sand control agent prepared in the example 1 into the coal dust and the fine silt, standing, observing a solid phase, and effectively aggregating the coal dust and the fine silt particles after standing for 30min without obvious solid phase outflow.
< recycle ability test >
The filter cake is used for simulating the damage of a near well, the sand control agent prepared in the example 1 is cleaned thoroughly, the effect is better than that of acid cleaning, and the sand control agent prepared in the example 1 can be used for the damage of near well substances (coal powder and fine silt).
The number of apparatuses and the scale of the process described herein are intended to simplify the description of the present invention. Applications, modifications and variations of the present invention will be apparent to those skilled in the art.
While embodiments of the invention have been disclosed above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (6)
1. The sand control agent for fracturing is characterized by being prepared by the following steps:
step 1) dissolving butadiene rubber in toluene to prepare a 1% by mass toluene solution of butadiene rubber, adding hydroxyethyl methacrylate, stirring, adding azobisisoheptonitrile, and stirring to obtain a sand control matrix; wherein the mass ratio of the butadiene rubber, the hydroxyethyl methacrylate and the azodiisoheptanonitrile is 1:10: 2;
step 2), preparing ceramic fibers into nano-grade ceramic fibers, and dispersing the nano-grade ceramic fibers in the sand control matrix to form a sand control colloid; wherein the mass ratio of the ceramic fiber to the sand control matrix is 1: 100;
step 3) heating the sand control colloid to 120 ℃, preserving heat, introducing nitrogen into the sand control colloid, keeping the pressure in a reaction kettle for containing the sand control colloid to be more than 1MPa, and maintaining the pressure to form a pressurized sand control colloid;
step 4) adding lauric acid into the pressurized sand control colloid, stirring, keeping the temperature and the pressure for 2 hours, adding triethylene diamine, stirring, keeping the temperature and the pressure for 2 hours, cooling to room temperature, then reducing the pressure to atmospheric pressure, and continuously stirring during the period to obtain a sand control agent; wherein the mass ratio of the ceramic fiber to the lauric acid to the triethylenediamine is 1:1: 1.
2. The sand control agent for fracturing as claimed in claim 1, wherein the heating rate of step 3) is 5 ℃/min and the pressurizing rate is 0.05 MPa/s.
3. The sand control agent for fracturing as claimed in claim 1, wherein the temperature reduction process of step 4) is: the temperature is reduced to 80 ℃ at the speed of 2 ℃/min, then is reduced to be lower than 40 ℃ at the speed of 4 ℃/min, and is reduced to be lower than 26 ℃ at the speed of 6 ℃/min.
4. The sand control agent for fracturing of claim 1, wherein the decompression rate of step 4) is 0.1 MPa/s.
5. The application method of the sand control agent for fracturing as claimed in any one of claims 1 to 4, which when applied to a plunger pump, comprises the following steps:
step a, using an annular packer, and performing well dredging and well washing before the packer is put in;
step b, setting the packer, checking leakage and ensuring that no leakage point exists;
step c, pressure testing;
d, squeezing and injecting the sand control agent by using an oil pipe at the discharge capacity of 300L/min;
e, after the displacement is finished, unsealing the packer, and lifting the drill to go out of the well;
and f, closing the well for 24-36 h.
6. The application method of the sand control agent for fracturing as claimed in any one of claims 1 to 4, which is applied to a screw pump and comprises the following steps:
step A, squeezing the sand control agent from the annulus by using a tubing at the displacement of 300L/min without using an annulus packer;
and step B, closing the well for 24-36h after the squeezing is finished.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010285669.5A CN111471446A (en) | 2020-04-13 | 2020-04-13 | Sand control agent for fracturing and application method thereof |
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| CN202010285669.5A CN111471446A (en) | 2020-04-13 | 2020-04-13 | Sand control agent for fracturing and application method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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