CN111880232A - Magnetic nano-film imaging proppant and preparation method and application thereof - Google Patents
Magnetic nano-film imaging proppant and preparation method and application thereof Download PDFInfo
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- CN111880232A CN111880232A CN202010640215.5A CN202010640215A CN111880232A CN 111880232 A CN111880232 A CN 111880232A CN 202010640215 A CN202010640215 A CN 202010640215A CN 111880232 A CN111880232 A CN 111880232A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/18—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging
- G01V3/26—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging operating with magnetic or electric fields produced or modified either by the surrounding earth formation or by the detecting device
-
- 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
- C09K8/80—Compositions for reinforcing fractures, e.g. compositions of proppants used to keep the fractures open
- C09K8/805—Coated proppants
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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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/10—Nanoparticle-containing well treatment fluids
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
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- Environmental & Geological Engineering (AREA)
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- Electromagnetism (AREA)
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Abstract
The invention provides a magnetic nano-film imaging proppant as well as a preparation method and application thereof, and the magnetic nano-film imaging proppant comprises a proppant inner core, wherein the proppant inner core is sequentially covered with a magnetic nano-film, a gas generation layer and a protective layer from inside to outside, wherein the mass ratio of each component is as follows: 80-85 parts of a propping agent core, 2-4 parts of a magnetic nano film, 10-15 parts of a gas generating layer and 1-2 parts of a protective layer. The magnetic nano film has the characteristics of magnetic single domain size, superparamagnetism and strong magnetism, and can be used for detecting crack magnetic disturbance through a magnetic nano probe to form an image; the gas generating layer generates water bubbles when meeting water, so that the body is suspended in the water; the protective layer has the functions of anti-caking and protecting internal components. The magnetic nano-film is prepared from water, nitric acid and aluminum isopropoxide in proportion to obtain the organic acidic solvent, the magnetic metal can be condensed and gelatinized, a three-dimensional network structure is formed inside the organic acidic solvent, and the magnetic nano-film has the advantages of good magnetic domain dispersibility, controllable size and good uniformity.
Description
Technical Field
The invention belongs to the technical field of oilfield development, and particularly relates to a magnetic nano-film imaging proppant as well as a preparation method and application thereof.
Background
The resource reserves of low-permeability and compact oil gas and shale oil gas account for a quite high proportion in the world and at home, hydraulic fracturing becomes a conventional single-well production and injection increasing technology, generally, a hydraulic fracturing production increasing measure is required at the initial production stage of the oil gas well of the oil and gas reservoir, the diversion capability is expanded, the fracturing production increasing effect is improved, and the high-quality single-well yield is obtained by injecting a propping agent. The hydraulic fracture plays a crucial role in the field of stimulation measures, and monitoring of the trend, the shape and the size of the hydraulic fracture is particularly important. The approximate size of the crack, whether multiple cracks are generated, whether the crack extends in a target layer or not can be evaluated through crack monitoring imaging, the length and height growth of the crack can be obtained along with the increase of the construction scale, and the optimal construction scale and the transformation parameters are determined. But there is currently a lack of economical, direct, repeatable fracture monitoring methods to image fractures.
The existing fracture monitoring method mainly comprises tiltmeter fracture monitoring and microseism fracture monitoring, and has the defects that the general form of the fracture can only be obtained along with short observation distance and lower resolution, information on the aspects of proppant laying and flow conductivity cannot be obtained, and detailed information on fracture expansion cannot be obtained, and the two parameters play a key role in capacity prediction.
In order to obtain proppant placement information for hydraulic fracturing, radioisotope tracer monitoring methods have also been developed. In the method, radioactive components (sometimes adopting multiple isotopes) are added in the fracturing process, and spectral gamma ray logging is carried out after fracturing; the disadvantages are short detection distance and unsafe hidden danger of radioactivity. For this reason, symmington (2006) proposes a method for the use of a fracturing process for high temperature reservoirs, using conductive material (calcareous) proppants, to locate the proppant distribution. The method can image the expansion range, the crack development direction and the size of the propping agent, and has the defects of serious imaging interference, insufficient detection distance and accuracy due to the fact that background environments such as reservoir fluid and the like have conductive properties.
Disclosure of Invention
The invention aims to provide a magnetic nano-film imaging proppant as well as a preparation method and application thereof, and solves the problems of radioactive proppants and conductive material proppants in hydraulic fracture monitoring imaging.
The invention also aims to provide a preparation method of the magnetic nano-film imaging proppant, so as to obtain the superparamagnetic and strong-magnetism nano-film proppant.
Another objective of the present invention is to provide an application of the magnetic nanomembrane imaging proppant, which can accurately determine the shape of the hydraulic fracture and the laying condition of the proppant by monitoring the magnetic field change before and after fracturing.
Therefore, the technical scheme provided by the invention is as follows:
the magnetic nano-film imaging proppant comprises a proppant inner core, wherein the proppant inner core is sequentially coated with a magnetic nano-film, a gas generation layer and a protective layer from inside to outside, wherein the mass ratio of each component is as follows: 80-85 parts of a propping agent core, 2-4 parts of a magnetic nano film, 10-15 parts of a gas generating layer and 1-2 parts of a protective layer.
The magnetic nano film is formed by attaching magnetic nano sol to a propping agent, wherein the magnetic nano sol consists of the following substances in percentage by mass: 20-25 parts of nitric acid, 1-2 parts of aluminum isopropoxide, 20-25 parts of nickel-iron-cobalt nitrate solution and the balance of water.
The gas generation layer comprises the following substances in parts by mass: 40-50 parts of binder, 30-35 parts of polyol resin, 18-24 parts of isocyanate, 2-4 parts of amine additive and 0.1-0.2 part of catalyst.
The protective layer comprises the following substances in parts by mass: 35-45 parts of degradable nano material and 55-65 parts of anti-caking agent.
The molar ratio of nickel, iron and cobalt in the nickel-iron-cobalt nitrate solution is as follows: 65:31:4.
The adhesive is a mixture of epoxy resin and phenolic resin, the weight ratio of the epoxy resin to the phenolic resin is 2-4:1, the hydroxyl equivalent of the polyalcohol resin is 60-300, the isocyanate resin is 2, 4-toluene diisocyanate, the amine additive is one or a mixture of more of diethylenetriamine, triethylamine, ethylamine, ethylenediamine and triethylenetetramine, and the catalyst is one or a mixture of two of alkyl tin compounds or alkyl lead compounds.
The anti-caking agent is one or a mixture of more of calcium silicate, calcium carbonate, fumed silica, kaolin, corn starch, sodium stearate, bentonite, attapulgite, styrene maleic anhydride resin, a nike surfactant, triethanolamine titanium chelate and triethanolamine zirconium chelate.
The degradable nano material comprises the following substances in parts by mass: 40-50 parts of starch, 30-40 parts of nano powder, 10-15 parts of plasticizer and 10-15 parts of polyvinyl alcohol, wherein the plasticizer is a mixture consisting of one or more of phthalate, adipate, azelate, sebacate, stearate, phosphate and glycerol.
A preparation method of a magnetic nano-film imaging proppant comprises the following steps:
step 1) preparing a degradable nano material and a magnetic nano sol for later use;
step 2) mixing the magnetic nano sol and the propping agent according to the mass ratio of 80-85:2-4, stirring in a marmite for 20-30 minutes, and then placing in an electromagnetic heating box to heat at the temperature of 350-;
step 3) heating the proppant intermediate to 250 ℃ of temperature of 200-;
step 4), when the temperature is reduced to 80-100 ℃, adding the degradable nano material and the anti-caking agent and stirring for 30-50 minutes; wherein the total mass ratio of the proppant to the degradable nano material to the anti-caking agent is 80-85:1-2, and the mass ratio of the degradable nano material to the anti-caking agent is 35-45: 55-65 parts;
and 5) uniformly dispersing, airing and screening to obtain the magnetic nano-film imaging proppant.
Use of a magnetic nanomembrane imaging proppant comprising the steps of:
step 1) before fracturing, measuring a magnetic field of the depth of an underground reservoir stratum with the radius of 1 kilometer around an oil well by using an aeromagnetic magnetometer, a SQUID (superconducting quantum interference device) magnetometer or a magnetic magnetometer in the oil well;
step 2) reforming a target layer of the oil well, carrying the target layer by using clear water, and adding a magnetic nano-film imaging proppant or simultaneously injecting the magnetic nano-film imaging proppant and a conventional proppant;
and 3) carrying out secondary measurement on the magnetic field of the depth of the underground reservoir stratum with the radius of 1 kilometer around the oil well by using an aviation geomagnetic instrument, a SQUID geomagnetic instrument or a magnetic instrument in the oil well, and comparing the secondary measurement with the primary measurement data to obtain magnetic field data formed after the magnetic nano-film imaging proppant enters, thereby obtaining a fracture imaging result.
The invention has the beneficial effects that:
the magnetic nano-film imaging proppant provided by the invention comprises a proppant inner core, a magnetic nano-film, a gas generating layer and a protective layer from inside to outside in sequence, wherein the magnetic nano-film has the characteristics of magnetic single domain size, superparamagnetism and strong magnetism, and can be imaged by detecting crack magnetic disturbance through a magnetic nano probe; the gas generating layer generates water bubbles when meeting water, so that the body is suspended in the water; the protective layer has the functions of anti-caking and protecting internal components.
The magnetic nano-film is prepared by water, nitric acid and aluminum isopropoxide according to a proportion to obtain an organic acid solvent, so that the magnetic metal can be condensed and gelatinized, a three-dimensional network structure is formed inside, and the magnetic domain has good dispersibility, controllable size and good uniformity; the nickel-iron-cobalt nitrate solution and other components are adopted, and the formed magnetic nano film has the advantages of high density, high coercive force (up to 119.4 KA/m), high signal-to-noise ratio, good oxidation resistance and the like.
The protective layer is hydrophobic and oleophilic, can prevent a gas generation layer from reacting with water, can be dissolved in the oil layer, and then releases a gas generation material, so that partial isocyanate in the gas generation layer rapidly reacts with water under the action of the amine additive to release a large amount of nano-scale bubbles, and the suspension of the propping agent in water is realized, thereby additionally adding a thickening agent required by the preparation of the sand-carrying fluid in the conventional fracturing process is not needed.
The method realizes the tracing display and the fracture imaging of the propping agent by detecting the change of the stratum magnetic field before and after the magnetic nano-film imaging propping agent carried by clear water injected into hydraulic fracturing, and has the advantages of clear imaging, long monitoring distance, capability of mastering the laying condition of the propping agent and the like compared with other fracture imaging technologies. Meanwhile, the proppant is coated with functional materials which generate gas when meeting water, so that clear water injection is realized, and compared with the conventional proppant, the proppant has the advantages of cleanness, environmental protection, simplicity in operation, no harm to a reservoir and the like.
In order to make the aforementioned and other objects of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
FIG. 1 is a schematic diagram of a magnetic nanomembrane imaging proppant structure of the present invention;
FIG. 2 is a schematic structural diagram of the magnetic nanomembrane imaging proppant of the present invention after exposure to oil;
FIG. 3 is a histogram comparing the performance of magnetic nano-films formed from different alloy materials.
In the figure:
description of reference numerals:
1. an inner proppant core; 2. a magnetic nanomembrane; 3. a gas generation layer; 4. and a protective layer.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention.
Example 1:
the embodiment provides a magnetic nano-film imaging proppant, which comprises a proppant inner core 1, wherein the proppant inner core 1 is sequentially coated with a magnetic nano-film 2, a gas generation layer 3 and a protective layer 4 from inside to outside, wherein the mass ratio of each component is as follows: 80-85 parts of a propping agent core, 2-4 parts of a magnetic nano film, 10-15 parts of a gas generating layer and 1-2 parts of a protective layer.
As shown in figure 1, the magnetic nano-film imaging proppant is composed of a proppant inner core 1, a magnetic nano-film 2, a gas generation layer 3 and a protective layer 4 from inside to outside, wherein the proppant inner core 1 is ceramsite or quartz sand for hydraulic fracturing, and the particle size is 0.11-0.85 mm.
The principle of the invention is as follows:
the proppant inner core 1 meets the pressure-bearing requirement in the fracturing process, and the magnetic nano-film 2 can detect the magnetic disturbance of the fracture through a magnetic nano-probe to form an image; the gas generating layer 3 generates water bubbles when meeting water, so that the body can be suspended in the water; the protective layer 4 functions as an anti-caking agent and protects the internal components.
Example 2:
on the basis of embodiment 1, this embodiment provides a magnetic nanomembrane imaging proppant, where the magnetic nanomembrane 2 is formed by attaching a magnetic nanosol to the proppant, and the magnetic nanosol is composed of the following substances in percentage by mass: 20-25 parts of nitric acid, 1-2 parts of aluminum isopropoxide, 20-25 parts of nickel-iron-cobalt nitrate solution and the balance of water.
The magnetic nano film 2 is prepared by water, nitric acid and aluminum isopropoxide according to a proportion to obtain an organic acid solvent, so that the magnetic metal can be condensed and gelatinized, a three-dimensional network structure is formed inside, and the magnetic domain has good dispersibility, controllable size and good uniformity; the nickel-iron-cobalt nitrate solution and other components are adopted, and the formed magnetic nano film has the advantages of high density, high coercive force (up to 119.4 KA/m), high signal-to-noise ratio, good oxidation resistance and the like.
The gas generating layer 3 comprises the following substances in parts by mass: 40-50 parts of binder, 30-35 parts of polyol resin, 18-24 parts of isocyanate, 2-4 parts of amine additive and 0.1-0.2 part of catalyst.
The adhesive is a mixture of epoxy resin and phenolic resin, the weight ratio of the epoxy resin to the phenolic resin is 2-4:1, the hydroxyl equivalent of the polyalcohol resin is 60-300, the isocyanate resin is 2, 4-toluene diisocyanate, the amine additive is one or a mixture of more of diethylenetriamine, triethylamine, ethylamine, ethylenediamine and triethylenetetramine, and the catalyst is one or a mixture of two of alkyl tin compounds or alkyl lead compounds.
The polyol resin reacts with isocyanate to generate polyurethane resin (-N = C = O + HO- → -NH-COO-) which has the excellent characteristics of high strength, compression resistance and abrasion resistance. Part of isocyanate reacts with water rapidly under the action of the amine additive to release a large amount of nano-scale bubbles, so that the propping agent is suspended in the water, and a thickening agent required by the preparation of the sand-carrying fluid in the conventional fracturing process is not required to be added additionally.
The protective layer 4 comprises the following substances in parts by mass: 35-45 parts of degradable nano material and 55-65 parts of anti-caking agent.
The anti-caking agent is one or a mixture of more of calcium silicate, calcium carbonate, fumed silica, kaolin, corn starch, sodium stearate, bentonite, attapulgite, styrene maleic anhydride resin, a nike surfactant, triethanolamine titanium chelate and triethanolamine zirconium chelate.
The degradable nano material comprises the following substances in parts by mass: 40-50 parts of starch, 30-40 parts of nano powder, 10-15 parts of plasticizer and 10-15 parts of polyvinyl alcohol, wherein the plasticizer is a mixture consisting of one or more of phthalate, adipate, azelate, sebacate, stearate, phosphate and glycerol.
The degradable nano material is a hydrophobic oleophylic system and is not degraded in water, so that a gas generation layer is prevented from reacting with water, the degradable nano material is dissolved in an oil layer after entering the oil layer, a schematic diagram after the degradable nano material is dissolved is shown in figure 2, and an anti-caking agent can prevent a protective layer from caking.
Example 3:
on the basis of embodiment 2, the embodiment provides a magnetic nano-film imaging proppant, which comprises 80 parts of a proppant inner core, 2 parts of a magnetic nano-film, 10 parts of a gas generating layer and 1 part of a protective layer.
The magnetic nano sol consists of the following substances in percentage by mass: 20 parts of nitric acid, 1 part of aluminum isopropoxide, 20 parts of nickel-iron-cobalt nitrate solution and 59 parts of water.
Wherein, the molar ratio of nickel, iron and cobalt in the nickel-iron-cobalt nitrate solution is as follows: 65:31:4. Adding ferronickel (FeNi) into nitric acid30) Heating and stirring until the nickel iron is completely dissolved, adding cobalt nitrate hexahydrate, and stirring until the cobalt nitrate hexahydrate is dissolved to obtain a nickel-iron-cobalt nitrate solution. Compared with other components, the nickel-iron-cobalt alloy has the advantages of high density, high coercive force (up to 119.4 KA/m), high signal-to-noise ratio, good oxidation resistance and the like, as shown in figure 3.
The gas generating layer 3 comprises the following substances in parts by mass: 40 parts of binder, 30 parts of polyol resin, 18 parts of isocyanate, 2 parts of amine additive and 0.1 part of catalyst.
In this embodiment, the binder is a mixture of epoxy resin and phenolic resin, the weight ratio of the epoxy resin to the phenolic resin is 2:1, the hydroxyl equivalent of the polyol resin is 60, the isocyanate resin is 2, 4-toluene diisocyanate, the amine additive is diethylenetriamine, and the catalyst is an alkyl tin compound.
The protective layer 4 comprises the following substances in parts by mass: 35 parts of degradable nano material and 55 parts of anti-caking agent.
In this example, the anti-caking agent was calcium silicate.
The degradable nano material comprises the following substances in parts by mass: 40 parts of starch, 30 parts of nano powder, 10 parts of plasticizer and 10 parts of polyvinyl alcohol. Wherein the plasticizer is phthalate.
The preparation process comprises the following steps:
step one, sequentially adding starch, nano powder, polyvinyl alcohol and a plasticizer in a formula ratio into a reaction kettle, and carrying out melt blending at the temperature of 140-;
adding nitric acid, aluminum isopropoxide and nickel-iron-cobalt nitrate solution into deionized water, mixing, stirring for 20-30 minutes, and standing for 20-30 hours to obtain magnetic nano sol;
mixing the magnetic nano sol and the proppant inner core in proportion, stirring in a sand mixing pot for 20-30 minutes, and then putting into an electromagnetic heating box to heat at the temperature of 350-;
step four, heating the proppant intermediate to 250 ℃ of temperature of 200-;
step five, when the temperature is reduced to 80-100 ℃, adding the degradable nano material and the anti-caking agent and stirring for 30-50 minutes;
and sixthly, dispersing uniformly, airing and screening to obtain the magnetic nano-film imaging proppant.
Example 4:
on the basis of embodiment 2, the embodiment provides a magnetic nano-film imaging proppant, which comprises 85 parts of a proppant inner core, 4 parts of a magnetic nano-film, 15 parts of a gas generating layer and 2 parts of a protective layer.
The magnetic nano sol consists of the following substances in percentage by mass: 25 parts of nitric acid, 2 parts of aluminum isopropoxide, 25 parts of nickel-iron-cobalt nitrate solution and 48 parts of water.
The gas generation layer comprises the following substances in parts by mass: 45 parts of binder, 35 parts of polyol resin, 20 parts of isocyanate, 3 parts of amine additive and 0.1 part of catalyst.
In this example, the binder is a mixture of epoxy resin and phenolic resin with a weight ratio of 3:1, the hydroxyl equivalent of polyol resin is 200, the isocyanate resin is 2, 4-toluene diisocyanate, the amine additive is a mixture of triethylamine and ethylamine with a mass ratio of 1:1, and the catalyst is a mixture of alkyl tin compound and alkyl lead compound with a mass ratio of 1: 1.
The protective layer comprises the following substances in parts by mass: 35 parts of degradable nano material and 65 parts of anti-caking agent.
In this example, the anti-caking agent was a mixture of calcium carbonate, fumed silica, kaolin, and corn starch in a mass ratio of 1:2:2: 3.
The degradable nano material comprises the following substances in parts by mass: 45 parts of starch, 35 parts of nano powder, 10 parts of plasticizer and 15 parts of polyvinyl alcohol, wherein the plasticizer is a mixture consisting of adipate and azelate, and the mass ratio is 2: 5.
The procedure was as in example 3.
Example 5:
on the basis of embodiment 2, the embodiment provides a magnetic nano-film imaging proppant, which comprises 80 parts of a proppant inner core, 4 parts of a magnetic nano-film, 15 parts of a gas generating layer and 1 part of a protective layer.
The magnetic nano sol consists of the following substances in percentage by mass: 20 parts of nitric acid, 2 parts of aluminum isopropoxide, 22 parts of nickel-iron-cobalt nitrate solution and 56 parts of water.
The gas generation layer comprises the following substances in parts by mass: 50 parts of binder, 35 parts of polyol resin, 24 parts of isocyanate, 4 parts of amine additive and 0.2 part of catalyst.
In this embodiment, the binder is a mixture of epoxy resin and phenolic resin, the weight ratio of the epoxy resin to the phenolic resin is 4:1, the hydroxyl equivalent of the polyol resin is 300, the isocyanate resin is 2, 4-toluene diisocyanate, the amine additive is a mixture of ethylenediamine and triethylene tetramine, the mass ratio of the amine additive is 5:2, and the catalyst is an alkyl lead compound.
The protective layer comprises the following substances in parts by mass: 45 parts of degradable nano material and 65 parts of anti-caking agent.
In this example, the anti-blocking agent is a mixture of sodium stearate, bentonite, attapulgite, styrene maleic anhydride resin, a nike surfactant, triethanolamine titanium chelate, and triethanolamine zirconium chelate in a mass ratio of 1:0.5:2:4:3:0.5:3: 2.
The degradable nano material comprises the following substances in parts by mass: 50 parts of starch, 40 parts of nano powder, 15 parts of plasticizer and 10 parts of polyvinyl alcohol, wherein the plasticizer is stearate.
The procedure was as in example 3.
Example 6:
the embodiment provides an application of a magnetic nano-film imaging proppant, which comprises the following steps:
step 1) before fracturing, measuring a magnetic field of the depth of an underground reservoir stratum with the radius of 1 kilometer around an oil well by using an aeromagnetic magnetometer, a SQUID (superconducting quantum interference device) magnetometer or a magnetic magnetometer in the oil well;
step 2) reforming a target layer of the oil well, carrying the target layer by using clear water, and adding a magnetic nano-film imaging proppant or simultaneously injecting the magnetic nano-film imaging proppant and a conventional proppant;
and 3) carrying out secondary measurement on the magnetic field of the depth of the underground reservoir stratum with the radius of 1 kilometer around the oil well by using an aviation geomagnetic instrument, a SQUID geomagnetic instrument or a magnetic instrument in the oil well, and comparing the secondary measurement with the primary measurement data to obtain magnetic field data formed after the magnetic nano-film imaging proppant enters, thereby obtaining a fracture imaging result.
This example was compared to other fracture monitoring techniques using magnetic nanomembrane imaging proppant prepared in example 3, and the results are shown in table 1.
TABLE 1 comparison table of magnetic nano-film imaging method and other crack monitoring technical parameters
The results in table 1 show that the method has the advantages of clear imaging, long detection distance, high accuracy, no damage to the reservoir, cleanness, environmental protection and safe use.
The magnetic nanomembrane imaging proppant versus conventional proppant parameters are shown in table 2 below:
the magnetic single domain size of the magnetic nano-film imaging proppant is 10-20 nanometers, and as can be seen from table 2, compared with conventional proppants and conductive proppants, the magnetic nano-film imaging proppant can be sand-carried in clear water and is environment-friendly.
The invention provides a method for imaging cracks by using magnetic nano-film propping agent imaging on the basis of the excellent characteristics of high magnetic permeability, low loss, high saturation magnetization and the like of a magnetic nano material and in a way of carrying out magnetic nano film coating on a propping agent. The method overcomes the defect that the conductive propping agent is easily interfered by the outside, and realizes the technical purpose of accurately and objectively evaluating the fracturing effect. Meanwhile, in order to improve the sand carrying performance of the proppant, a functional material which generates bubbles when meeting water is coated outside the magnetic nano-film proppant, so that the sand carrying function of clean water is realized, and the proppant can be injected into the stratum by adopting any medium. The method can accurately monitor the artificial fracture form and the proppant laying condition, and has the advantages of clear imaging, sand carrying in clear water, simple operation, no damage to a reservoir, cleanness, environmental protection, safe use, easy popularization and the like.
Example 7:
on the basis of example 6, the present example applied magnetic nanomembrane imaging proppant for fracture imaging 1:
s1, selecting an A1 well for hydraulic fracturing and fracture imaging monitoring, wherein the reservoir depth is 2000-2050 m;
s2, selecting a SQUID magnetometer to measure the magnetic field at the depth of 1950-2100 underground in the range of 1 km of the radius around the A1 well;
s3, modifying the A1 well target layer, carrying with clear water, and adding 40 parts of magnetic nano-film imaging proppant;
s4, carrying out secondary measurement on the magnetic field with the depth of 1950-2100 underground in the range of 1 km of the radius around the A1 well by using a SQUID magnetometer, and obtaining a crack imaging result by comparing the secondary measurement with the primary measurement data.
Example 8:
on the basis of example 6, this example applied magnetic nanomembrane imaging proppant for fracture imaging 2:
s1, selecting an A2 well for hydraulic fracturing and fracture imaging monitoring;
s2, measuring the magnetic field of the A2 well target layer by using a well magnetometer;
s3, modifying the A2 well target layer, carrying with slickwater, adding 20 parts of magnetic nano-film imaging proppant and 40 parts of conventional proppant (injecting two proppants simultaneously);
and S4, carrying out secondary measurement on the magnetic field of the target layer of the A2 well by using a well magnetometer, and comparing the magnetic field with the primary measurement data to obtain a fracture imaging result.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.
Claims (10)
1. A magnetic nanomembrane imaging proppant, comprising: the composite proppant comprises a proppant inner core (1), wherein the proppant inner core (1) is sequentially coated with a magnetic nano film (2), a gas generating layer (3) and a protective layer (4) from inside to outside, and the weight ratio of each component is as follows: 80-85 parts of a proppant inner core (1), 2-4 parts of a magnetic nano film (2), 10-15 parts of a gas generating layer (3) and 1-2 parts of a protective layer (4).
2. The magnetic nanomembrane imaging proppant of claim 1, wherein: the magnetic nano film (2) is formed by attaching magnetic nano sol to a proppant inner core (1), wherein the magnetic nano sol consists of the following substances in percentage by mass: 20-25 parts of nitric acid, 1-2 parts of aluminum isopropoxide, 20-25 parts of nickel-iron-cobalt nitrate solution and the balance of water.
3. The magnetic nanomembrane imaging proppant of claim 1, wherein: the gas generation layer (3) comprises the following substances in parts by mass: 40-50 parts of binder, 30-35 parts of polyol resin, 18-24 parts of isocyanate, 2-4 parts of amine additive and 0.1-0.2 part of catalyst.
4. The magnetic nanomembrane imaging proppant of claim 1, wherein: the protective layer (4) comprises the following substances in parts by mass: 35-45 parts of degradable nano material and 55-65 parts of anti-caking agent.
5. The magnetic nanomembrane imaging proppant of claim 2, wherein: the molar ratio of nickel, iron and cobalt in the nickel-iron-cobalt nitrate solution is as follows: 65:31:4.
6. The magnetic nanomembrane imaging proppant of claim 3, wherein: the adhesive is a mixture of epoxy resin and phenolic resin, the weight ratio of the epoxy resin to the phenolic resin is 2-4:1, the hydroxyl equivalent of the polyalcohol resin is 60-300, the isocyanate resin is 2, 4-toluene diisocyanate, the amine additive is one or a mixture of more of diethylenetriamine, triethylamine, ethylamine, ethylenediamine and triethylenetetramine, and the catalyst is one or a mixture of two of alkyl tin compounds or alkyl lead compounds.
7. The magnetic nanomembrane imaging proppant of claim 4, wherein: the anti-caking agent is one or a mixture of more of calcium silicate, calcium carbonate, fumed silica, kaolin, corn starch, sodium stearate, bentonite, attapulgite, styrene maleic anhydride resin, a nike surfactant, triethanolamine titanium chelate and triethanolamine zirconium chelate.
8. The magnetic nanomembrane imaging proppant of claim 4, wherein: the degradable nano material comprises the following substances in parts by mass: 40-50 parts of starch, 30-40 parts of nano powder, 10-15 parts of plasticizer and 10-15 parts of polyvinyl alcohol, wherein the plasticizer is a mixture consisting of one or more of phthalate, adipate, azelate, sebacate, stearate, phosphate and glycerol.
9. The method for preparing the magnetic nanomembrane imaging proppant according to claim 3, comprising the following steps:
step 1) preparing a degradable nano material and a magnetic nano sol for later use;
step 2) mixing the magnetic nano sol and the proppant inner core (1) according to the mass ratio of 80-85:2-4, stirring in a marmite for 20-30 minutes, and then placing in an electromagnetic heating box to heat at the temperature of 350-;
step 3) heating the proppant intermediate to 250 ℃ of temperature of 200-;
step 4), when the temperature is reduced to 80-100 ℃, adding the degradable nano material and the anti-caking agent and stirring for 30-50 minutes; wherein the total mass ratio of the proppant to the degradable nano material to the anti-caking agent is 80-85:1-2, and the mass ratio of the degradable nano material to the anti-caking agent is 35-45: 55-65 parts;
and 5) uniformly dispersing, airing and screening to obtain the magnetic nano-film imaging proppant.
10. Use of a magnetic nanomembrane imaging proppant according to claims 1 to 8, comprising the steps of:
step 1) before fracturing, measuring a magnetic field of the depth of an underground reservoir stratum with the radius of 1 kilometer around an oil well by using an aeromagnetic magnetometer, a SQUID (superconducting quantum interference device) magnetometer or a magnetic magnetometer in the oil well;
step 2) reforming a target layer of the oil well, carrying the target layer by using clear water, and adding a magnetic nano-film imaging proppant or simultaneously injecting the magnetic nano-film imaging proppant and a conventional proppant;
and 3) carrying out secondary measurement on the magnetic field of the depth of the underground reservoir stratum with the radius of 1 kilometer around the oil well by using an aviation geomagnetic instrument, a SQUID geomagnetic instrument or a magnetic instrument in the oil well, and comparing the secondary measurement with the primary measurement data to obtain magnetic field data formed after the magnetic nano-film imaging proppant enters, thereby obtaining a fracture imaging result.
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