CN115368880B - Density-adjustable plugging material and preparation method thereof - Google Patents
Density-adjustable plugging material and preparation method thereof Download PDFInfo
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- CN115368880B CN115368880B CN202110558520.4A CN202110558520A CN115368880B CN 115368880 B CN115368880 B CN 115368880B CN 202110558520 A CN202110558520 A CN 202110558520A CN 115368880 B CN115368880 B CN 115368880B
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- 239000000463 material Substances 0.000 title claims abstract description 119
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 239000011368 organic material Substances 0.000 claims abstract description 29
- 229910010272 inorganic material Inorganic materials 0.000 claims abstract description 27
- 239000011147 inorganic material Substances 0.000 claims abstract description 27
- 239000002699 waste material Substances 0.000 claims abstract description 14
- 239000004793 Polystyrene Substances 0.000 claims abstract description 11
- 229920002223 polystyrene Polymers 0.000 claims abstract description 11
- 229920006327 polystyrene foam Polymers 0.000 claims abstract description 11
- 239000004417 polycarbonate Substances 0.000 claims abstract description 10
- 229920000515 polycarbonate Polymers 0.000 claims abstract description 10
- 239000000440 bentonite Substances 0.000 claims abstract description 9
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 9
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 9
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 8
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 4
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 claims abstract description 3
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 claims abstract description 3
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims abstract description 3
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical group ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 claims description 28
- 239000002245 particle Substances 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 15
- 239000003960 organic solvent Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 10
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 3
- 238000010298 pulverizing process Methods 0.000 claims 3
- 239000002002 slurry Substances 0.000 abstract description 105
- 238000005553 drilling Methods 0.000 abstract description 21
- 239000011435 rock Substances 0.000 abstract description 4
- 239000000725 suspension Substances 0.000 abstract description 3
- 230000009977 dual effect Effects 0.000 abstract 1
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- 239000012530 fluid Substances 0.000 description 17
- 241000758789 Juglans Species 0.000 description 10
- 235000009496 Juglans regia Nutrition 0.000 description 10
- 235000020234 walnut Nutrition 0.000 description 10
- 239000010445 mica Substances 0.000 description 8
- 229910052618 mica group Inorganic materials 0.000 description 8
- 239000002904 solvent Substances 0.000 description 8
- 238000002474 experimental method Methods 0.000 description 7
- 230000008014 freezing Effects 0.000 description 7
- 238000007710 freezing Methods 0.000 description 7
- 239000004033 plastic Substances 0.000 description 7
- 229920003023 plastic Polymers 0.000 description 7
- 239000011257 shell material Substances 0.000 description 7
- 239000010433 feldspar Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 description 4
- 239000011707 mineral Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000005755 formation reaction Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
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- 239000010455 vermiculite Substances 0.000 description 2
- 229910052902 vermiculite Inorganic materials 0.000 description 2
- 235000019354 vermiculite Nutrition 0.000 description 2
- 208000010392 Bone Fractures Diseases 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 206010017076 Fracture Diseases 0.000 description 1
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- 230000009471 action Effects 0.000 description 1
- 239000012620 biological material Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000012456 homogeneous solution Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
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- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
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- 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
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/426—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells for plugging
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Abstract
The invention belongs to the field of oil gas, dry hot rock and geothermal drilling, and particularly relates to a density-adjustable plugging material and a preparation method thereof. The density-adjustable plugging material comprises: an organic material and an inorganic material; the mass ratio of the inorganic material to the organic material is 10:1-0.05:1; the organic material is at least one selected from polystyrene, waste polystyrene foam, polycarbonate and ABS; the inorganic material includes at least one of bentonite, calcium carbonate and barite powder. The material has the dual advantages of organic materials and inorganic materials, has good temperature and pressure resistance, has certain elasticity and toughness, can be well suspended in the plugging slurry, does not generate layering, solves the problem of suspension stability of the plugging material in bridging plugging slurry, and simplifies the types of the plugging materials. Can be applied to the plugging of deep wells and malignant leakage layers in a large scale, and has great application potential.
Description
Technical Field
The invention belongs to the field of oil gas, dry hot rock and geothermal drilling, and particularly relates to a density-adjustable plugging material and a preparation method thereof.
Background
In the oil gas, dry hot rock and geothermal drilling process, lost circulation often occurs when drilling formations with pressure failure, broken or weakly consolidated formations, fracture development formations, multiple sets of pressure layers and the like, and bridging plugging technology is still the most common mode. The bridging plugging mechanism is that inert materials enter a crack bridging plugging leakage layer, particle materials with different particle sizes and different degrees of hardness form a bridge, and after the bridge is formed, a basic framework for plugging the leakage channel is formed, and the leakage channel is changed from large to small. The strength of the framework determines whether the plugging is successful or not. According to the maximum pressure difference theory of inelastic damage of single-particle bridge, the strength of the plugging band is in direct proportion to the strength of the bridging material, namely, the higher the strength of the bridging material is, the higher the strength of the formed plugging band is, so that the bridging material with high strength is selected, the strength of the plugging wall is guaranteed, and the plugging effect is improved.
In order to ensure the plugging effect, the existing plugging slurry is generally compounded by a plurality of plugging materials with different shapes, different sizes and different properties, and common biological materials such as walnut shells, sawdust, cotton fibers and the like, organic materials such as rubber powder, plastic sheets, fibers and the like, mineral materials such as mica, vermiculite, feldspar and the like are used. However, these plugging materials have some problems in application.
(1) When the plugging materials are added into the plugging slurry at the same time, because of density differences among the different plugging materials and between the plugging materials and the plugging slurry, low-density walnut shells, rubber powder float upwards under the action of gravity, mineral materials such as mica sink, and the rising or sinking speed of the large-particle-size materials is higher than that of the small-particle-size materials, so that the stability of the plugging slurry is damaged.
(2) The density of walnut shells, sawdust and fibers in the common plugging material is low, but the temperature resistance is less than 150 ℃, and the strength of the plugging material decays rapidly under the solution environment due to the water absorption effect; most resin plastic materials have a density lower than 1.1g/cm 3, but can deform or change in properties at a certain temperature, and cannot meet the stratum plugging requirement above 150 ℃. While mineral materials such as mica and vermiculite have strong temperature resistance and high strength, the mineral materials have density of more than 2.0g/cm 3 and are easy to settle, and the density is shown in table 1. The plugging material has the density of 1.1-2.0g/cm 3 which is close to the density of drilling fluid base slurry in the middle range, good high-temperature (above 150 ℃) pressure bearing resistance and stable performance, and is very few.
(3) The plugging materials in the existing plugging slurry have various compositions, and in order to meet the suspension stability of the slurry, the plugging slurry needs to keep certain viscosity and shear force, but the high-viscosity plugging slurry can increase pumping pressure on one hand, and the addition of the plugging materials is limited due to the viscosity of the slurry on the other hand. And when the plugging slurry enters a higher-temperature plugging layer, the viscosity of the plugging slurry becomes low, and the delamination phenomenon of plugging materials still occurs, so that the plugging effect is influenced.
Along with the increasing of deep wells and ultra-well wells and the huge development potential of dry-hot rock, high-temperature stratum leakage brings higher requirements to the strength maintenance of bridging plugging materials at high temperature. There is an urgent need to optimize and develop bridging materials that have a density close to that of the plugging slurry, and that have good temperature resistance and high strength. When the plugging material is applied, the density of the plugging material is close to that of a drilling fluid system, the plugging material can suspend well in the drilling fluid, the types of the plugging material can be simplified, meanwhile, the temperature and pressure resistance are high, and a plugging wall with certain strength can be formed at the temperature of a leakage layer.
Table 1 part of Properties of commonly used plugging Material
Disclosure of Invention
The invention aims to solve the problems and develop the plugging material with the specified density and good temperature and pressure resistance and the preparation method thereof, wherein the plugging material can be well suspended in the plugging slurry without layering, the problem of the suspension stability of the plugging material in bridging the plugging slurry is solved, the types of the plugging material are simplified, and the pressure-bearing requirement under the high-temperature condition is met.
To achieve the above object, a first aspect of the present invention provides a density-adjustable plugging material, comprising:
An organic material and an inorganic material;
The mass ratio of the inorganic material to the organic material is 10:1-0.05:1;
the organic material is at least one selected from polystyrene, waste polystyrene foam, polycarbonate and ABS;
The inorganic material includes at least one of bentonite, calcium carbonate and barite powder.
The obtained plugging material is added into the plugging slurry, the plugging material is suspended and does not settle, and the granularity grading of the plugging material in the plugging slurry can be kept uniform and stable.
According to the present invention, the inorganic material may be other inorganic materials conventionally used by those skilled in the art as long as the object of the present invention is satisfied.
As a preferable scheme, the density-adjustable plugging material comprises the following components: organic and inorganic materials, i.e. containing only organic and inorganic materials.
Preferably, the mass ratio of the inorganic material to the organic material is 4:1-0.1:1. This range is the optimal operating range. If the inorganic material content is too high, the resulting homogeneous solution may be too viscous or may not be mixed and the homogeneity may be affected. And if the content of the inorganic material is too low, the density of the formed plugging material is low, and the temperature and pressure resistance is relatively poor. ( Remarks: the higher the inorganic material content is, the better the temperature resistance and the higher the pressure bearing capacity of the prepared plugging material are, but the more viscous the solution formed during mixing is, the greater the operation difficulty is )
Preferably, the organic material is polystyrene, and may be polystyrene foam.
The second aspect of the present invention provides a method for preparing the above-mentioned density-adjustable plugging material, which comprises:
(1) Dissolving an organic material into an organic solvent to form a viscous solution which is uniformly dissolved;
(2) Adding inorganic materials into the viscous solution which is uniformly dissolved, and uniformly mixing to obtain a mixture;
(3) Vacuumizing the mixture, drying at low temperature and recovering the organic solvent;
(4) Crushing to obtain the plugging material with the target particle size.
According to the invention, in general, the lower the density of the plugging material is, the more organic materials need to be mixed, but the corresponding temperature and pressure resistance is reduced.
Preferably, the organic solvent is dichloromethane and/or chloroform. More preferably dichloromethane.
According to the invention, the comminution means is freeze comminution and/or direct comminution.
Preferably, the mass ratio of the organic material to the organic solvent is 1-40:100. More preferably 12 to 25:100.
The invention has the beneficial effects that:
(1) The method is simple and easy to operate, can prepare plugging materials with different densities according to the needs, and can be applied in large scale.
(2) According to the method, the organic material and the inorganic material are uniformly mixed in a solution state, so that the material formed by evaporating the solvent has uniform overall structure, the density is between that of the organic material and the inorganic material, and the plugging material with any density can be prepared by adjusting the types of the organic material and the inorganic material according to the needs.
(3) The method of the invention can use waste polystyrene foam and waste polycarbonate plastic as raw materials, which is beneficial to environmental protection.
(4) The organic solvent does not participate in the reaction in the method, and plays a role in converting the organic material into a liquid state so as to be convenient for being uniformly mixed with the inorganic material. Can be recovered by a recovery device, and has low cost.
(5) The plugging material formed by the invention has good temperature resistance and high pressure resistance, and the prepared plugging material is added into the plugging slurry, so that the plugging material is not settled in a suspending way, and the granularity grading of the plugging material in the plugging slurry can be kept uniform and stable.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the preferred embodiments of the present invention are described below, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The particle size collocation rule of the plugging material is carried out according to the distribution rule of SAN-2 engineering, and specifically comprises the following steps:
Wherein:
V 1 -volume of particles left on S-size screen,%;
V t —total volume of particles left on Smin screen,%;
S min, the size of the maximum mesh sieve used, and mm;
k-constant, generally 1.1-1.2;
w-width of crack to be plugged, mm.
Calculating the volume ratio of materials with different particle diameters according to the SAN-2 engineering distribution rule, and determining the weight of the materials with different particle diameters according to the volume ratio.
And (3) plugging evaluation: and performing plugging evaluation by using a DLM-01A type plugging simulation device, wherein the maximum pressure bearing range of the instrument is 7MPa.
Example 1:
(1) 100g of methylene dichloride is weighed, 25g of polystyrene (which can be waste polystyrene foam) is added, 2.5g of bentonite is added after uniform stirring, the mixture is placed in a vacuum dryer after uniform stirring, the temperature is set to 50 ℃, and the solvent is recovered through the dryer. And after the samples are completely dried, freezing and crushing the samples into plugging materials with different particle size scales, and measuring the density of the plugging materials to be 1.1g/cm 3.
(2) And (5) preparing plugging slurry A. In drilling fluid base slurry with density of 1.1g/cm 3, the obtained plugging material is added according to SAN-2 engineering distribution rule, and the total addition amount of the plugging material is 8% of the weight volume ratio of the slurry.
(3) And (5) preparing plugging slurry B. In drilling fluid base slurry with density of 1.1g/cm 3, walnut shell plugging materials with the same granularity and proportion are added according to SAN-2 engineering distribution rule, and the total addition of the plugging materials is 8% of the weight volume ratio of the slurry.
(4) The plugging properties of the plugging slurry A and the plugging slurry B are compared after the plugging slurry A and the plugging slurry B are respectively heated and rolled for 16 hours at 150 ℃. The plugging slurry A can plug 3mm cracks and bear pressure of 3MPa. The plugging slurry B fails to plug.
Example 2
(1) 100G of methylene dichloride is weighed, 25g of polystyrene (which can be waste polystyrene foam) is added, 14g of bentonite is added after uniform stirring, the mixture is placed in a vacuum dryer after uniform stirring, the temperature is set to 50 ℃, and the solvent is recovered through the dryer. And after the samples are completely dried, freezing and crushing the samples into plugging materials with different particle size scales, and measuring the density of the plugging materials to be 1.3g/cm 3.
(2) And (5) preparing plugging slurry A. In drilling fluid base slurry with density of 1.3g/cm 3, the obtained plugging material is added according to SAN-2 engineering distribution rule, and the total addition amount of the plugging material is 8% of the weight volume ratio of the slurry.
(3) And (5) preparing plugging slurry B. In drilling fluid base slurry with density of 1.3g/cm 3, walnut shell plugging materials with the same granularity and proportion are added according to SAN-2 engineering distribution rule, and the total addition of the plugging materials is 8% of the weight volume ratio of the slurry.
(4) The plugging properties of the plugging slurry A and the plugging slurry B are compared after the plugging slurry A and the plugging slurry B are respectively heated and rolled for 16 hours at 150 ℃. The plugging slurry A can plug 3mm cracks and bear pressure of 4.8MPa. The plugging slurry B fails to plug.
Example 3:
(1) 100g of methylene dichloride is weighed, 25g of polystyrene (which can be waste polystyrene foam) is added, 32g of bentonite is added after uniform stirring, the mixture is placed in a vacuum dryer after uniform stirring, the temperature is set to 50 ℃, and the solvent is recovered through the dryer. And after the samples are completely dried, freezing and crushing the samples into plugging materials with different particle size scales, and measuring the density of the plugging materials to be 1.5g/cm 3.
(2) And (5) preparing plugging slurry A. In drilling fluid base slurry with density of 1.5g/cm 3, according to SAN-2 engineering distribution rule, the above-mentioned obtained plugging material is added, and the total adding quantity of plugging material is 10% weight-volume ratio of slurry.
(3) And (5) preparing plugging slurry B. In drilling fluid base slurry with density of 1.5g/cm 3, according to SAN-2 engineering distribution rule, walnut shell, mica and feldspar plugging materials with the same granularity and proportion are added, the proportion of the three materials is 2:2:1, and the total addition of the plugging materials is 10% of the weight volume ratio of the slurry.
(4) The plugging properties of the plugging slurry A and the plugging slurry B are compared after the plugging slurry A and the plugging slurry B are respectively heated and rolled for 16 hours at 150 ℃. The plugging slurry A can plug 3mm cracks, bear pressure of 6MPa, and can be successfully plugged after being placed for 24 hours. And (3) layering phenomenon occurs after the plugging slurry B is heated and rolled, immediately performing plugging experiments after stirring uniformly, bearing pressure by 3MPa, and placing for 24 hours after stirring, so that plugging fails.
Example 4:
(1) 120g of methylene dichloride is weighed, 25g of polystyrene (which can be waste polystyrene foam) is added, 82g of bentonite is added after uniform stirring, the mixture is placed in a vacuum dryer after uniform stirring, the temperature is set to 50 ℃, and the solvent is recovered through the dryer. And after the samples are completely dried, freezing and crushing the samples into plugging materials with different particle size scales, and measuring the density of the plugging materials to be 1.8g/cm 3.
(2) And (5) preparing plugging slurry A. In drilling fluid base slurry with density of 1.8g/cm 3, the obtained plugging material is added according to SAN-2 engineering distribution rule, and the total addition amount of the plugging material is 12% of the weight volume ratio of the slurry.
(3) And (5) preparing plugging slurry B. In drilling fluid base slurry with density of 1.8g/cm 3, according to SAN-2 engineering distribution rule, walnut shell, mica and feldspar plugging materials with the same granularity and proportion are added, the proportion of the three materials is 2:2:1, and the total addition of the plugging materials is 12% of the weight volume ratio of the slurry.
(4) The plugging properties of the plugging slurry A and the plugging slurry B are compared after the plugging slurry A and the plugging slurry B are respectively heated and rolled for 16 hours at 150 ℃. The plugging slurry A can plug 3mm cracks, bear pressure of 7MPa, and can be successfully plugged after being placed for 24 hours. And (3) layering phenomenon occurs after the plugging slurry B is heated and rolled, immediately performing plugging experiments after stirring uniformly, bearing pressure by 3MPa, and placing for 24 hours after stirring, so that plugging fails.
Example 5:
(1) 100g of methylene dichloride is weighed, 25g of polycarbonate (which can be waste polycarbonate plastic) is added, 58g of bentonite is added after uniform stirring, the mixture is placed in a vacuum dryer after uniform stirring, the temperature is set to be 50 ℃, and the solvent is recovered through the dryer. And after the samples are completely dried, freezing and crushing the samples into plugging materials with different particle size scales, and measuring the density of the plugging materials to be 1.8g/cm 3.
(2) And (5) preparing plugging slurry A. In drilling fluid base slurry with density of 1.8g/cm 3, the obtained plugging material is added according to SAN-2 engineering distribution rule, and the total addition amount of the plugging material is 12% of the weight volume ratio of the slurry.
(3) And (5) preparing plugging slurry B. In drilling fluid base slurry with density of 1.8g/cm 3, according to SAN-2 engineering distribution rule, walnut shell, mica and feldspar plugging materials with the same granularity and proportion are added, the proportion of the three materials is 2:2:1, and the total addition of the plugging materials is 12% of the weight volume ratio of the slurry.
(4) The plugging properties of the plugging slurry A and the plugging slurry B are compared after the plugging slurry A and the plugging slurry B are respectively heated and rolled for 16 hours at 150 ℃. The plugging slurry A can plug 4mm cracks, bear pressure of 7MPa, and can be successfully plugged after being placed for 24 hours. And (3) layering phenomenon occurs after the plugging slurry B is heated and rolled, immediately performing plugging experiments after stirring uniformly, bearing pressure by 3MPa, and placing for 24 hours after stirring, so that plugging fails.
Example 6:
(1) 200g of methylene chloride is weighed, 20g of polycarbonate (waste polycarbonate plastic) and 5g of polystyrene (waste polystyrene foam plastic) are added, 70g of superfine calcium carbonate is added after uniform stirring, the mixture is placed in a vacuum dryer after uniform stirring, the temperature is set to 50 ℃, and the solvent is recovered through the dryer. And after the samples are completely dried, freezing and crushing the samples into plugging materials with different particle size scales, and measuring the density of the plugging materials to be 2.0g/cm 3.
(2) And (5) preparing plugging slurry A. And adding the obtained plugging material into drilling fluid base slurry with the density of 2.0g/cm 3 according to SAN-2 engineering distribution rule, wherein the total addition of the plugging material is 12% of the weight and volume ratio of the slurry.
(3) And (5) preparing plugging slurry B. In drilling fluid base slurry with density of 2.0g/cm 3, according to SAN-2 engineering distribution rule, walnut shell, mica and feldspar plugging materials with the same granularity and proportion are added, the proportion of the three materials is 2:2:1, and the total addition of the plugging materials is 12% of the weight volume ratio of the slurry.
(4) The plugging properties of the plugging slurry A and the plugging slurry B are compared after the plugging slurry A and the plugging slurry B are respectively heated and rolled for 16 hours at 150 ℃. The plugging slurry A can plug 4mm cracks, bear pressure of 7MPa, and can be successfully plugged after being placed for 24 hours. Layering phenomenon occurs after the plugging slurry B is heated and rolled, plugging experiments are immediately carried out after uniform stirring, bearing pressure is 5MPa, and after stirring, the plugging experiments are carried out after 24 hours, so that bearing pressure is 1MPa.
Example 7:
(1) 100g of methylene chloride is weighed, 10g of polycarbonate (waste polycarbonate plastic) and 10g of polystyrene (waste polystyrene foam plastic) are added, 80g of bentonite is added after uniform stirring, the mixture is placed in a vacuum dryer after uniform stirring, the temperature is set to 50 ℃, and the solvent is recovered through the dryer. And after the samples are completely dried, freezing and crushing the samples into plugging materials with different particle size scales, and measuring the density of the plugging materials to be 1.9g/cm 3.
(2) And (5) preparing plugging slurry A. In drilling fluid base slurry with density of 1.9g/cm 3, the obtained plugging material is added according to SAN-2 engineering distribution rule, and the total addition amount of the plugging material is 10% of the weight volume ratio of the slurry.
(3) And (5) preparing plugging slurry B. In drilling fluid base slurry with density of 1.9g/cm 3, according to SAN-2 engineering distribution rule, walnut shell, mica and feldspar plugging materials with the same granularity and proportion are added, the proportion of the three materials is 2:2:1, and the total addition of the plugging materials is 10% of the weight volume ratio of the slurry.
(4) The plugging properties of the plugging slurry A and the plugging slurry B are compared after the plugging slurry A and the plugging slurry B are respectively heated and rolled for 16 hours at 150 ℃. The plugging slurry A can plug 4mm cracks, bear pressure of 7MPa, and can be successfully plugged after being placed for 24 hours. Layering phenomenon occurs after the plugging slurry B is heated and rolled, plugging experiments are immediately carried out after uniform stirring, bearing pressure is 5MPa, and after stirring, the plugging experiments are carried out after 24 hours, so that bearing pressure is 1MPa.
The foregoing description of embodiments of the invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described.
Claims (10)
1. A density-tunable plugging material, the density-tunable plugging material comprising:
An organic material and an inorganic material;
The mass ratio of the inorganic material to the organic material is 10:1-0.05:1;
the organic material is at least one selected from polystyrene, waste polystyrene foam, polycarbonate and ABS;
the inorganic material comprises at least one of bentonite, calcium carbonate and barite powder;
The preparation method of the density-adjustable plugging material comprises the following steps:
(1) Dissolving an organic material into an organic solvent to form a viscous solution which is uniformly dissolved;
(2) Adding inorganic materials into the viscous solution which is uniformly dissolved, and uniformly mixing to obtain a mixture;
(3) Vacuumizing the mixture, drying at low temperature and recovering the organic solvent;
(4) Crushing to obtain the plugging material with the target particle size.
2. The density-tunable plugging material of claim 1, wherein the composition of the density-tunable plugging material is:
Organic materials and inorganic materials.
3. The density-tunable plugging material of claim 1 or 2, wherein,
The mass ratio of the inorganic material to the organic material is 4:1-0.1:1.
4. The density-tunable plugging material of claim 1 or claim 2, wherein the organic material is polystyrene.
5. A method for preparing a density-adjustable plugging material according to any one of claims 1 to 4, comprising:
(1) Dissolving an organic material into an organic solvent to form a viscous solution which is uniformly dissolved;
(2) Adding inorganic materials into the viscous solution which is uniformly dissolved, and uniformly mixing to obtain a mixture;
(3) Vacuumizing the mixture, drying at low temperature and recovering the organic solvent;
(4) Crushing to obtain the plugging material with the target particle size.
6. The preparation method according to claim 5, wherein,
The organic solvent is dichloromethane and/or chloroform.
7. The process according to claim 6, wherein the organic solvent is methylene chloride.
8. The process according to claim 5, wherein the pulverization is freeze pulverization and/or direct pulverization.
9. The process according to claim 5, wherein the mass ratio of the organic material to the organic solvent is 1 to 40:100.
10. The preparation method according to claim 9, wherein the mass ratio of the organic material to the organic solvent is 12-25:100.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110551491A (en) * | 2018-05-31 | 2019-12-10 | 中国石油化工股份有限公司 | Coating plugging agent, preparation method thereof and plugging slurry |
| CN110872503A (en) * | 2018-09-04 | 2020-03-10 | 中石化石油工程技术服务有限公司 | Novel composite plugging agent for well drilling and application thereof |
| CN112625663A (en) * | 2019-09-24 | 2021-04-09 | 中国石油化工股份有限公司 | Well cementation composite leaking stoppage isolation liquid system and application thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110551491A (en) * | 2018-05-31 | 2019-12-10 | 中国石油化工股份有限公司 | Coating plugging agent, preparation method thereof and plugging slurry |
| CN110872503A (en) * | 2018-09-04 | 2020-03-10 | 中石化石油工程技术服务有限公司 | Novel composite plugging agent for well drilling and application thereof |
| CN112625663A (en) * | 2019-09-24 | 2021-04-09 | 中国石油化工股份有限公司 | Well cementation composite leaking stoppage isolation liquid system and application thereof |
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