CN115404059A - Preparation method and application of plugging agent for medium-low temperature fractured lost stratum - Google Patents
Preparation method and application of plugging agent for medium-low temperature fractured lost stratum Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims abstract description 35
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 53
- 238000002156 mixing Methods 0.000 claims abstract description 42
- 239000002245 particle Substances 0.000 claims abstract description 28
- 239000013305 flexible fiber Substances 0.000 claims abstract description 21
- 238000003756 stirring Methods 0.000 claims abstract description 21
- 235000013312 flour Nutrition 0.000 claims abstract description 18
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 229920001169 thermoplastic Polymers 0.000 claims abstract description 10
- 239000004416 thermosoftening plastic Substances 0.000 claims abstract description 10
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 9
- 238000012216 screening Methods 0.000 claims abstract description 8
- 239000000835 fiber Substances 0.000 claims description 27
- 239000010426 asphalt Substances 0.000 claims description 15
- IANQTJSKSUMEQM-UHFFFAOYSA-N 1-benzofuran Chemical compound C1=CC=C2OC=CC2=C1 IANQTJSKSUMEQM-UHFFFAOYSA-N 0.000 claims description 6
- 239000004743 Polypropylene Substances 0.000 claims description 5
- -1 polypropylene Polymers 0.000 claims description 5
- 229920001155 polypropylene Polymers 0.000 claims description 5
- 229920002725 thermoplastic elastomer Polymers 0.000 claims description 5
- 239000010425 asbestos Substances 0.000 claims description 4
- 229920005989 resin Polymers 0.000 claims description 4
- 239000011347 resin Substances 0.000 claims description 4
- 229910052895 riebeckite Inorganic materials 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- 229920002239 polyacrylonitrile Polymers 0.000 claims description 3
- 238000005755 formation reaction Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 10
- 239000002657 fibrous material Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 238000005553 drilling Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 239000008187 granular material Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 230000003211 malignant effect Effects 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 239000012815 thermoplastic material Substances 0.000 description 1
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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
- C09K8/42—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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- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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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
- C09K2208/08—Fiber-containing well treatment fluids
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Abstract
The invention discloses a preparation method and application of a plugging agent for a medium-low temperature fractured lost stratum, wherein the preparation method comprises the following steps: (1) Mixing thermoplastic elastic particles and flexible fibers, placing the mixture in a universal flour mill, setting the temperature of the universal flour mill to be 35-45 ℃, and stirring and mixing; (2) Setting the temperature of the universal flour mill to be less than 0 ℃, and stirring and mixing; (3) Sequentially stacking 8-mesh, 10-mesh, 20-mesh, 30-mesh, 40-mesh and 60-mesh screens from top to bottom, screening the product obtained in the step (2), recording screen residues on the 8-mesh and 10-mesh screens as RND-1, recording screen residues on the 20-mesh and 30-mesh screens as RND-2, and recording screen residues on the 40-mesh and 60-mesh screens as RND-3; and (4) respectively taking RND-1, RND-2 and RND-3, and mixing. The plugging agent prepared by the invention can improve the plugging success rate of medium and low temperature fractured formations.
Description
Technical Field
The invention belongs to the technical field of oil and gas drilling engineering, and particularly relates to a preparation method and application of a plugging agent for a medium-low temperature fractured lost stratum.
Background
The lost circulation, especially the loss caused by fractured stratum, is one of the most common and difficult-to-handle downhole complex conditions in oil and gas drilling operation, not only wastes drilling time, but also may cause a series of complex conditions such as sticking, blowout, collapse of well and the like, and even cause the abandonment of well bores, thereby causing great economic loss. In the Ordovician basin well drilling process, the well leakage conditions of the well drilling in the loheu group, the Cantonese group, the Liujia ditch group and other layers are the most common, and the influence on the well drilling operation is the most serious. The vertical depth of the leakage layer is within 2000m, the temperature of the leakage layer is lower than 80 ℃, and the leakage layer belongs to a medium-low temperature fractured leakage stratum. In the process of forming the bridging plugging layer, the introduction of the fiber material can weaken the flow resistance of the plugging agent and enhance the structural strength of the plugging layer, the existing bridging leak-proof plugging material is mostly formed by mixing rigid particles or particles and the fiber material, the particle framework and the fiber lacing material are stored and used in a separate form, and the phenomena of uneven mixing of the particles and the fiber structure, weak structural force, easy damage of the bridging plugging layer and the like exist. In order to improve the leakage-proof and plugging efficiency of low-temperature fractured strata in an Ordos basin, the particles and the fibers are combined with the structural characteristics and are fused into an integral structure, so that the plugging layer has the filling and plugging effects of particle materials and the lacing and resistance increasing capabilities of fiber materials, and is a new idea for efficiently constructing the plugging layer.
The existing plugging agent and bridging plugging system mainly use rigid plugging particles, and are difficult to accurately match the width of a crack, so that the plugging success rate is low, and the leakage is repeated. At present, many documents report related researches and inventions aiming at a plugging agent and a plugging system for a fractured leakage stratum, but the use conditions and the action and the efficacy of various products are different. For example, CN107235691A, a leak-stopping agent for plugging malignant leakage formation fractures and a preparation method thereof, discloses a leak-stopping agent for plugging malignant leakage passages of large fractures, which comprises oil well grade G cement, gravel, rice stones, fracturing sand, a fine plugging agent, a fluid loss additive and an external admixture, wherein the fiber material in the components is used as the fine plugging agent, sulfonated asphalt is used as the fluid loss additive, and the sulfonated asphalt is only used as one of the compositions to achieve the effect of reducing the fluid loss. Patent CN106281272A "a bridging plugging agent for fractured reservoir, its preparation method and application" discloses a bridging plugging agent for fractured reservoir and its preparation method, where the plugging agent includes: the plugging agent comprises bridging materials, calcium carbonate particles, asphalt powder and acid-soluble fibers, but the asphalt powder in the plugging agent does not disclose specific size distribution, and the preparation method is only a composition formed by simply and physically blending multiple components. Patent CN103160262A, a fracture plugging agent for oil well reservoir, a preparation method and applications thereof, discloses a fracture plugging agent composed of an acid-soluble fiber material, a degradable high molecular compound, an oil-soluble inert particle material, a degradable delayed swelling agent, an acid-soluble inorganic salt and water, wherein the acid-soluble fiber material is polyamide fiber, the length is 5-25 mm, and the diameter is 0.5-1.5 mm; the oil-soluble inert granular material is oil-soluble asphalt, the diameter of the granules is distributed between 1 mm and 6mm, the preparation method comprises the steps of adding all the components into water through a mixing funnel and uniformly mixing to obtain a finished product, and the asphalt granules and the fibers are independent components and are not organically combined with the characteristics of the two materials.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a preparation method and application of a plugging agent for a medium-low temperature fractured lost stratum, wherein the plugging agent integrates the functions of fiber materials and thermoplastic elastic particles, and has high plugging strength.
A preparation method of a plugging agent for a medium-low temperature fractured lost stratum comprises the following steps:
(1) Mixing thermoplastic elastic particles and flexible fibers, placing the mixture in a universal flour mill, setting the temperature of the universal flour mill to be 35-45 ℃ and the rotating speed to be 700-900r/min, and stirring and mixing for 8-13min;
(2) Setting the temperature of the universal flour mill to be less than 0 ℃, setting the rotating speed to be 1500-2500r/min, and stirring and mixing for 2-5min;
(3) Sequentially stacking 8-mesh, 10-mesh, 20-mesh, 30-mesh, 40-mesh and 60-mesh screens from top to bottom, placing the product obtained in the step (2) on the 8-mesh screen for oscillating screening, then sequentially passing through the 10-mesh, 20-mesh, 30-mesh, 40-mesh and 60-mesh screens, marking the screen residues on the 8-mesh and 10-mesh screens as RND-1, marking the screen residues on the 20-mesh and 30-mesh screens as RND-2, and marking the screen residues on the 40-mesh and 60-mesh screens as RND-3;
(4) Respectively taking RND-1, RND-2 and RND-3, and mixing to obtain the plugging agent.
Preferably, in the step (1), the mass ratio of the thermoplastic elastomer particles to the flexible fibers is 60-80% and the mass ratio of the flexible fibers is 20-40% based on 100% of the total mass of the thermoplastic elastomer particles and the flexible fibers.
Preferably, in the step (3), the total mass of RND-1, RND-2 and RND-3 is 100%, and the mass ratio of each component is as follows: 20-30% of RND-1, 40-60% of RND-2 and 20-30% of RND-3.
Preferably, the thermoplastic elastomer particles are one of bitumen and coumarone resin.
Preferably, the thermoplastic elastomer particles each have a softening point of from 50 to 80 ℃.
Preferably, the flexible fiber is at least one of palm fiber, asbestos fiber, polypropylene fiber and polyacrylonitrile fiber.
More preferably, in the step (1), the temperature of the universal mill is set to be 40 ℃, the rotating speed is set to be 800r/min, and stirring and mixing are carried out for 10min.
More preferably, in the step (2), the temperature of the universal mill is set to-10 ℃, the rotating speed is set to 2000r/min, and stirring and mixing are carried out for 3min.
The application of the plugging agent for the medium-low temperature fractured lost stratum specifically comprises the following steps: the plugging agent is used for middle and low temperature fracture loss at the stratum temperature of 80 ℃ below between the Zhongsheng and the Gusheng of the Ordoku basin, and is prepared by the preparation method.
The invention has the advantages that:
(1) The invention realizes the fiber coating on the surface of thermoplastic materials such as asphalt, resin and the like by stirring and mixing under the temperature control condition and crushing and granulating at low temperature, and combines the functions of the fiber materials and the thermoplastic particles into a whole;
(2) The plugging agent prepared by the invention has a fiber fluff shell and an elastic bonding core, has the effects of a tie bar and a flow resistance of a fiber structure, and has the characteristic of changeability bonding of thermoplastic particles after temperature rise, so that the limit effect of crack size on plugging particles is overcome, a bridging plugging layer in a crack has higher filling efficiency and structural strength, and the success rate of plugging of a medium-low temperature fractured stratum can be improved.
Drawings
FIG. 1 shows the results of the experimental evaluation of the plugging ability of the plugging agent at different temperatures.
Detailed Description
In the embodiment of the invention, the adopted universal flour mill is a WF-50 universal flour mill produced by Jiangyin Union mechanical equipment Limited company, and the working temperature can be set between-20 ℃ and 100 ℃; the adopted asphalt and coumarone resin are purchased from Zhongxiwei waterproof material science and technology Limited, and the softening points are 60 ℃ and 60-80 ℃ respectively.
Example 1
A preparation method of a plugging agent for a medium-low temperature fractured lost stratum comprises the following steps:
(1) Mixing 60 parts of asphalt and 40 parts of flexible fibers, placing the mixture in a universal mill, setting the temperature of the universal mill to be 40 ℃, setting the rotating speed to be 800r/min, and stirring and mixing for 10min; the flexible fibers are palm fibers and asbestos fibers in a mass ratio of 1;
(2) Setting the temperature of the universal flour mill to be-10 ℃, setting the rotating speed to be 2000r/min, and stirring and mixing for 3min;
(3) Sequentially stacking screens of 8 meshes, 10 meshes, 20 meshes, 30 meshes, 40 meshes and 60 meshes from top to bottom, placing the product obtained in the step (2) on the screen of 8 meshes for oscillating and screening, then sequentially passing through the screens of 10 meshes, 20 meshes, 30 meshes, 40 meshes and 60 meshes, marking the screen residues on the screens of 8 meshes and 10 meshes as RND-1, marking the screen residues on the screens of 20 meshes and 30 meshes as RND-2, and marking the screen residues on the screens of 40 meshes and 60 meshes as RND-3;
(4) Respectively taking RND-1, RND-2 and RND-3, and mixing, wherein the total mass of RND-1, RND-2 and RND-3 is 100%, and the mass ratio of each component is as follows: 20 percent of RND-1, 60 percent of RND-2 and 20 percent of RND-3 to obtain the plugging agent.
Example 2
A preparation method of a plugging agent for a medium-low temperature fractured lost stratum comprises the following steps:
(1) Mixing 70 parts of asphalt and 30 parts of flexible fibers, placing the mixture in a universal mill, setting the temperature of the universal mill to be 40 ℃, setting the rotating speed to be 800r/min, and stirring and mixing for 10min; the flexible fiber is polyacrylonitrile fiber and asbestos fiber in a mass ratio of 1;
(2) Setting the temperature of the universal flour mill to-10 ℃ and the rotating speed to 2000r/min, and stirring and mixing for 3min;
(3) Sequentially stacking screens of 8 meshes, 10 meshes, 20 meshes, 30 meshes, 40 meshes and 60 meshes from top to bottom, placing the product obtained in the step (2) on the screen of 8 meshes for oscillating and screening, then sequentially passing through the screens of 10 meshes, 20 meshes, 30 meshes, 40 meshes and 60 meshes, marking the screen residues on the screens of 8 meshes and 10 meshes as RND-1, marking the screen residues on the screens of 20 meshes and 30 meshes as RND-2, and marking the screen residues on the screens of 40 meshes and 60 meshes as RND-3;
(4) Respectively taking RND-1, RND-2 and RND-3, and mixing, wherein the total mass of RND-1, RND-2 and RND-3 is 100%, and the mass ratio of each component is as follows: 25% of RND-1, 50% of RND-2 and 25% of RND-3 to obtain the plugging agent.
Example 3
A preparation method of a plugging agent for a medium-low temperature fractured lost stratum comprises the following steps:
(1) Mixing 80 parts of asphalt and 20 parts of flexible fibers, placing the mixture in a universal mill, setting the temperature of the universal mill to be 40 ℃, setting the rotating speed to be 800r/min, and stirring and mixing for 10min; the flexible fibers are polypropylene fibers and palm fibers in a mass ratio of 1;
(2) Setting the temperature of the universal flour mill to-10 ℃ and the rotating speed to 2000r/min, and stirring and mixing for 3min;
(3) Sequentially stacking 8-mesh, 10-mesh, 20-mesh, 30-mesh, 40-mesh and 60-mesh screens from top to bottom, placing the product obtained in the step (2) on the 8-mesh screen for oscillating screening, then sequentially passing through the 10-mesh, 20-mesh, 30-mesh, 40-mesh and 60-mesh screens, marking the screen residues on the 8-mesh and 10-mesh screens as RND-1, marking the screen residues on the 20-mesh and 30-mesh screens as RND-2, and marking the screen residues on the 40-mesh and 60-mesh screens as RND-3;
(4) Respectively taking RND-1, RND-2 and RND-3, and mixing, wherein the total mass of RND-1, RND-2 and RND-3 is 100%, and the mass ratio of each component is as follows: 30 percent of RND-1, 40 percent of RND-2 and 30 percent of RND-3 to obtain the plugging agent.
Example 4
A preparation method of a plugging agent for a medium-low temperature fractured lost stratum comprises the following steps:
(1) Mixing 80 parts of asphalt and 20 parts of flexible fibers, placing the mixture in a universal mill, setting the temperature of the universal mill to be 40 ℃, setting the rotating speed to be 700r/min, and stirring and mixing for 13min; the flexible fibers are polypropylene fibers and palm fibers in a mass ratio of 1;
(2) Setting the temperature of the universal flour mill to be-10 ℃, setting the rotating speed to be 1500r/min, and stirring and mixing for 5min;
(3) Sequentially stacking screens of 8 meshes, 10 meshes, 20 meshes, 30 meshes, 40 meshes and 60 meshes from top to bottom, placing the product obtained in the step (2) on the screen of 8 meshes for oscillating and screening, then sequentially passing through the screens of 10 meshes, 20 meshes, 30 meshes, 40 meshes and 60 meshes, marking the screen residues on the screens of 8 meshes and 10 meshes as RND-1, marking the screen residues on the screens of 20 meshes and 30 meshes as RND-2, and marking the screen residues on the screens of 40 meshes and 60 meshes as RND-3;
(4) Respectively taking RND-1, RND-2 and RND-3, and mixing, wherein the total mass of RND-1, RND-2 and RND-3 is 100%, and the mass ratio of each component is as follows: 30 percent of RND-1, 40 percent of RND-2 and 30 percent of RND-3 to obtain the plugging agent.
Example 5
A preparation method of a plugging agent for a medium-low temperature fractured lost stratum comprises the following steps:
(1) Mixing 80 parts of asphalt and 20 parts of flexible fibers, placing the mixture in a universal mill, setting the temperature of the universal mill to be 40 ℃ and the rotating speed to be 900r/min, and stirring and mixing for 8min; the flexible fibers are polypropylene fibers and palm fibers in a mass ratio of 1;
(2) Setting the temperature of the universal flour mill to be-10 ℃, setting the rotating speed to be 2500r/min, and stirring and mixing for 2min;
(3) Sequentially stacking 8-mesh, 10-mesh, 20-mesh, 30-mesh, 40-mesh and 60-mesh screens from top to bottom, placing the product obtained in the step (2) on the 8-mesh screen for oscillating screening, then sequentially passing through the 10-mesh, 20-mesh, 30-mesh, 40-mesh and 60-mesh screens, marking the screen residues on the 8-mesh and 10-mesh screens as RND-1, marking the screen residues on the 20-mesh and 30-mesh screens as RND-2, and marking the screen residues on the 40-mesh and 60-mesh screens as RND-3;
(4) Respectively taking RND-1, RND-2 and RND-3, and mixing, wherein the total mass of RND-1, RND-2 and RND-3 is 100%, and the mass ratio of each component is as follows: 30 percent of RND-1, 40 percent of RND-2 and 30 percent of RND-3 to obtain the plugging agent.
Normal temperature leak stopping effect detection
A pressure-bearing capacity evaluation experiment is carried out on the plugging agents of the embodiments 1 to 5 by using a DL-III type fracture plugging instrument, a fracture module with the fracture width of 3mm is adopted in the experiment, the test temperature of the experiment is room temperature (25 ℃), and the fracture pressure-bearing plugging capacity is shown in Table 1.
Table 1 evaluation of crack plugging ability test results
| Examples | Bearing capacity/MPa | leakage/mL |
| 1 | 5.8 | 165 |
| 2 | 7.2 | 76 |
| 3 | 6.4 | 98 |
| 4 | 6.2 | 114 |
| 5 | 5.4 | 172 |
From experimental test results, the pressure bearing capacity of the plugging agent prepared in the embodiments 1-3 is over 5MPa at normal temperature, the pressure bearing capacity is good, the pressure bearing capacity of the plugging agent prepared in the embodiment 2 can reach 7.2MPa, and the plugging effect is relatively best.
Second, leak stopping effect at different temperatures
The changes of the plugging and pressure-bearing capacity of examples 1 to 5 at 25 ℃, 40 ℃, 60 ℃, 80 ℃ and 100 ℃ were measured respectively by using a high-temperature high-pressure plugging apparatus, and the results are shown in fig. 1.
The experimental results in fig. 1 show that as the temperature rises in the experimental test, the pressure-bearing capacity of different embodiments shows the phenomenon of rising first and then falling, and when the temperature is lower than 80 ℃, the pressure-bearing capacity of each embodiment is more than 5MPa, and when the temperature exceeds 80 ℃, the pressure-bearing capacity is sharply reduced. The reason for showing the phenomenon is that the plugging agent formed by the invention can deform along with the rise of temperature and has certain bonding capability, when the temperature is below 80 ℃, the bonding effect among particles is stronger, so that the plugging particles form a whole through the deformation and extrusion effect, and the strength of a plugging layer is improved; when the temperature exceeds 80 ℃, the strength of the leaking stoppage particles is greatly reduced by increasing the temperature, so that the pressure bearing strength of the plugging layer is sharply reduced. Therefore, the plugging agent developed by the invention has a better pressure-bearing plugging effect on a medium-low temperature fractured leakage stratum below 80 ℃.
Claims (9)
1. A preparation method of a plugging agent for a medium-low temperature fractured lost stratum is characterized by comprising the following steps: the method comprises the following steps:
(1) Mixing thermoplastic elastic particles and flexible fibers, placing the mixture in a universal flour mill, setting the temperature of the universal flour mill to be 35-45 ℃ and the rotating speed to be 700-900r/min, and stirring and mixing for 8-13min;
(2) Setting the temperature of the universal flour mill to be less than 0 ℃, setting the rotating speed to be 1500-2500r/min, and stirring and mixing for 2-5min;
(3) Sequentially stacking 8-mesh, 10-mesh, 20-mesh, 30-mesh, 40-mesh and 60-mesh screens from top to bottom, placing the product obtained in the step (2) on the 8-mesh screen for oscillating screening, then sequentially passing through the 10-mesh, 20-mesh, 30-mesh, 40-mesh and 60-mesh screens, marking the screen residues on the 8-mesh and 10-mesh screens as RND-1, marking the screen residues on the 20-mesh and 30-mesh screens as RND-2, and marking the screen residues on the 40-mesh and 60-mesh screens as RND-3;
(4) Respectively taking RND-1, RND-2 and RND-3, and mixing to obtain the plugging agent.
2. The preparation method of the plugging agent for the medium-low temperature fractured lost formation according to claim 1, wherein the preparation method comprises the following steps: in the step (1), the mass percentage of the thermoplastic elastic particles to the flexible fibers is 60-80% and the mass percentage of the flexible fibers to the thermoplastic elastic particles is 20-40%, based on 100% of the total mass of the thermoplastic elastic particles and the flexible fibers.
3. The preparation method of the plugging agent for the medium-low temperature fractured lost formation according to claim 2, wherein the preparation method comprises the following steps: in the step (3), the total mass of RND-1, RND-2 and RND-3 is 100%, and the mass ratio of each component is as follows: 20-30% of RND-1, 40-60% of RND-2 and 20-30% of RND-3.
4. The preparation method of the plugging agent for the medium-low temperature fractured lost formation according to claim 3, wherein the preparation method comprises the following steps: the thermoplastic elastic particles are one of asphalt and coumarone resin.
5. The preparation method of the plugging agent for the medium-low temperature fractured lost formation according to claim 4, wherein the preparation method comprises the following steps: the thermoplastic elastomer particles all have a softening point of 50-80 ℃.
6. The preparation method of the plugging agent for the medium-low temperature fractured lost formation according to claim 5, wherein the preparation method comprises the following steps: the flexible fiber is at least one of palm fiber, asbestos fiber, polypropylene fiber and polyacrylonitrile fiber.
7. The preparation method of the plugging agent for the medium-low temperature fractured lost formation according to claim 6, wherein the preparation method comprises the following steps: in the step (1), the temperature of the universal flour mill is set to be 40 ℃, the rotating speed is set to be 800r/min, and stirring and mixing are carried out for 10min.
8. The preparation method of the plugging agent for the medium-low temperature fractured lost formation according to claim 7, wherein the preparation method comprises the following steps: in the step (2), the temperature of the universal flour mill is set to be 10 ℃ below zero, the rotating speed is set to be 2000r/min, and stirring and mixing are carried out for 3min.
9. The application of the plugging agent for the medium-low temperature fractured lost stratum is characterized in that: the plugging agent is used for middle and low temperature fractured leakage of the Orifice-Gusheng boundary stratum in Ordos basin at the temperature of below 80 ℃, and is prepared by the preparation method of any one of claims 1 to 8.
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001032405A1 (en) * | 1998-04-03 | 2001-05-10 | Griffith Research And Development Enterprises Pty. Limited | Fibre reinforced thermoplastic composite |
| CN101161936A (en) * | 2006-10-10 | 2008-04-16 | 深圳市海川实业股份有限公司 | Polyacrylonitrile fiber reinforcement emulsified asphalt slurry seal |
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