CN115418213A - Petroleum fracturing propping agent for horizontal well and preparation method thereof - Google Patents
Petroleum fracturing propping agent for horizontal well and preparation method thereof Download PDFInfo
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- CN115418213A CN115418213A CN202210909617.XA CN202210909617A CN115418213A CN 115418213 A CN115418213 A CN 115418213A CN 202210909617 A CN202210909617 A CN 202210909617A CN 115418213 A CN115418213 A CN 115418213A
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- horizontal well
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- petroleum fracturing
- fracturing propping
- propping agent
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- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 65
- 239000003208 petroleum Substances 0.000 title claims abstract description 22
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 34
- 238000005245 sintering Methods 0.000 claims abstract description 11
- 239000011248 coating agent Substances 0.000 claims abstract description 10
- 238000000576 coating method Methods 0.000 claims abstract description 10
- 238000001035 drying Methods 0.000 claims abstract description 10
- 238000005469 granulation Methods 0.000 claims abstract description 7
- 230000003179 granulation Effects 0.000 claims abstract description 7
- 239000000843 powder Substances 0.000 claims abstract description 7
- 239000002245 particle Substances 0.000 claims description 24
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 claims description 20
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 17
- 239000006004 Quartz sand Substances 0.000 claims description 16
- 229910001570 bauxite Inorganic materials 0.000 claims description 12
- 239000000440 bentonite Substances 0.000 claims description 11
- 229910000278 bentonite Inorganic materials 0.000 claims description 11
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 11
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 10
- 239000000839 emulsion Substances 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 7
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 6
- 239000003822 epoxy resin Substances 0.000 claims description 6
- 229920001568 phenolic resin Polymers 0.000 claims description 6
- 239000005011 phenolic resin Substances 0.000 claims description 6
- 229920000647 polyepoxide Polymers 0.000 claims description 6
- -1 polytetrafluoroethylene Polymers 0.000 claims description 6
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 6
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 6
- 238000012216 screening Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 235000007164 Oryza sativa Nutrition 0.000 claims description 5
- 235000009566 rice Nutrition 0.000 claims description 5
- 239000010902 straw Substances 0.000 claims description 5
- 235000013339 cereals Nutrition 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 3
- 238000007873 sieving Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 240000007594 Oryza sativa Species 0.000 claims 1
- 239000002994 raw material Substances 0.000 abstract description 9
- 230000005012 migration Effects 0.000 abstract description 6
- 238000013508 migration Methods 0.000 abstract description 6
- 230000007812 deficiency Effects 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 10
- 239000007789 gas Substances 0.000 description 5
- 241000209094 Oryza Species 0.000 description 4
- 239000011435 rock Substances 0.000 description 4
- 230000002209 hydrophobic effect Effects 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000002154 agricultural waste Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 239000007888 film coating Substances 0.000 description 2
- 238000009501 film coating Methods 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 239000010903 husk Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Classifications
-
- 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
Abstract
The application relates to the technical field of petroleum fracturing propping agents, and discloses a petroleum fracturing propping agent for a horizontal well and a preparation method thereof. All raw materials are ground into powder before preparation, the central aggregate is sintered, then the support material is wrapped outside the central aggregate, granulation, drying and sintering are carried out, and finally film covering is carried out. The center aggregate is made into a light porous shape by using the pore-forming agent, and the support material is wrapped outside the center aggregate to make up for the deficiency of the strength of the center aggregate, so that the support agent has higher strength. The proppant is low in overall weight and density, is easy to suspend in the upper cracks of the horizontal well, and the setting of the coating material can improve the horizontal migration capacity of the proppant.
Description
Technical Field
The application relates to the technical field of petroleum fracturing propping agents, in particular to a petroleum fracturing propping agent for a horizontal well and a preparation method thereof.
Background
When the petroleum and natural gas deep well is exploited, after fracturing treatment is carried out on a high-closure-pressure low-permeability deposit, an oil-gas-containing rock stratum is cracked, oil gas is collected from a channel formed by the crack, and at the moment, fluid is injected into a rock base layer to exceed the pressure of the fracture strength of the stratum, so that the rock stratum around a shaft is cracked, and a channel with high flow capacity is formed. The proppant has the function of filling the fracture after the rock formation is pressed out of the fracture so that the fracture is not closed any more, and oil and gas migration becomes easier, thereby increasing the yield of the oil and gas field. The petroleum fracturing propping agent has the characteristics of high compressive strength, strong abrasion resistance, low relative density, stable chemical performance and the like, the flow conductivity of a sand filling crack and the effective area of a supporting crack are directly determined by the physical and chemical properties of the petroleum fracturing propping agent, the existing ceramsite propping agent prepared by adopting a bauxite ceramsite process is commonly used, the horizontal migration speed of the propping agent is influenced by factors such as crack width, wall surface and the like in the fracturing of a horizontal well, and the adaptability of the existing propping agent to the horizontal well is low, so that the propping agent suitable for the horizontal well is required.
Disclosure of Invention
In order to solve the problem that the existing petroleum fracturing propping agent is not adaptive to a horizontal well, the application provides a petroleum fracturing propping agent and a preparation method thereof, the strength of the propping agent is ensured while the density of the propping agent is reduced through the cooperation of light-weight central aggregate and a propping agent, and the outer layer is made of a hydrophobic and oleophobic material so that the propping agent is more suitable for the horizontal well.
In order to achieve the purpose, the technical scheme adopted by the application is as follows: the center-making hole reduces the density, and the outer layer is covered with a film to prevent liquid from entering.
A petroleum fracturing propping agent for a horizontal well comprises the following components in a mass ratio of 20-35: 5-10 parts of central aggregate, support material and coating material, wherein the central aggregate comprises 75-92wt% of quartz sand and 8-15wt% of pore-forming agent, the support material comprises 85-90wt% of bauxite, 4-8wt% of bentonite, 1-5wt% of manganese dioxide and 1-6wt% of magnesium powder, and the coating material comprises one or more of polytetrafluoroethylene, phenolic resin and epoxy resin.
In a horizontal well, the conventional proppant is difficult to suspend at the top end of the upper fracture of the horizontal well, and excessive proppant is added, so that the cost is high, the proppant can be gathered at the low-lying part of the horizontal well, and the oil and gas yield cannot be increased in proportion to the investment cost of the proppant. The proppant provided by the scheme has three layers from inside to outside, wherein the innermost layer is the central aggregate prepared from quartz sand and a pore-forming agent, the quartz sand is used as a main raw material, and the pore-forming agent enables the central aggregate to form a loose and porous structure, so that the proppant has the characteristics of light weight and low density, and is beneficial to reducing the overall density of the proppant and enabling the proppant to be easily suspended. Compared with the prior art, the integral strength of the proppant is easily insufficient by directly manufacturing the whole proppant into a porous structure. This scheme utilization supporting material wraps up in central aggregate, and the support material in intermediate level adopts a large amount of bauxite to guarantee that the proppant has higher intensity, and bentonite plays the effect of adhesive, and manganese dioxide and magnesium powder play the effect of fluxing agent. The outermost layer coating material is made of a raw material with hydrophobic and oleophobic properties, so that the horizontal migration speed of the propping agent is improved.
Further, the pore-forming agent is one or more of rice hulls, straws and sawdust. Adopt agricultural discarded object as the pore-forming agent in the central aggregate in this scheme, compare, inorganic pore-forming agent is commonly used to the pore-forming agent in the current proppant production process, and the hole diameter of producing is littleer, and because central aggregate is only the inlayer in the proppant in this application, pays more attention to the requirement of low density, provides the guarantee by the proppant in the aspect of the intensity, consequently, can adopt agricultural discarded object as pore-forming agent such as rice husk straw, forms the great hole of diameter.
The preparation method of the petroleum fracturing propping agent for the horizontal well in the scheme comprises the following steps:
s1, respectively grinding quartz sand, a pore-forming agent, bauxite, bentonite, manganese dioxide and magnesium powder into powder and sieving the powder with a 200-mesh sieve;
s2, preparing spherical granular central aggregate by using the quartz sand obtained in the S1 and a pore-forming agent according to the proportion of 75-92;
s3, uniformly mixing the bauxite, the bentonite, the manganese dioxide and the magnesium powder obtained in the S1 according to a weight ratio of 85-90;
s4, drying the particles obtained in the step S3 and sintering the particles into a primary finished product;
s5, screening the primary finished product in the S4 to obtain a secondary finished product with the grain size of 0.4-0.7 mm;
s6, adding the secondary finished product into liquid prepared from one or more of polytetrafluoroethylene emulsion, phenolic resin emulsion and epoxy resin emulsion, and heating and stirring;
and S7, cooling and screening to obtain the proppant.
According to the scheme, the granular central aggregate is supported by the quartz sand and the pore-forming agent, the raw materials used by the supporting material are wrapped outside the central aggregate, the loose and porous central aggregate is ensured to be positioned at the innermost layer, the strength reduction caused by undefined layering with the supporting material is avoided, then the central aggregate and the supporting material are dried and sintered into granules together, and finally the granules are coated with a film, so that the surface characteristics of the supporting object are improved.
Further, the preparation of the central aggregate comprises the following steps:
s2.1, uniformly mixing the quartz sand obtained in the S1 with a pore-forming agent;
s2.2, adding water into the mixture obtained in the S2.1 for granulation;
s2.3, drying the particles obtained in the S2.2 at low temperature under the vacuum condition of 100-150 ℃ until the water content is lower than 5%;
and S2.4, sintering the particles obtained from the S2.3 at the temperature of 1000-1200 ℃ for 1-2 hours, and then cooling the particles in the furnace to the normal temperature.
According to the scheme, the preparation process of the center aggregate is optimized, and the center aggregate is sintered and then used for mixing with the raw materials of the supporting material in the next step. Meanwhile, the sintering temperature of the center aggregate is lower,
further, the method for preparing the mixture and the central aggregate into the particulate matters in the step S3 comprises the following steps: the granular central aggregate after being soaked is put into a disc granulator together with the mixture for granulation.
Further, the particles in the step S4 are dried under the vacuum condition of 200-300 ℃, then sintered for 4-6 hours under the condition of 1200-1300 ℃, and are kept warm for 0.5-1 hour, and finally are naturally cooled to below 80 ℃.
Furthermore, the grain diameter of the secondary finished product is within the range of 0.4-0.7 mm.
Further, the particle size of the proppant is 0.6-0.8mm.
The beneficial effect of this application is: according to the oil fracturing propping agent, the oil fracturing propping agent is designed into multiple layers to mutually supplement each other and improve the performance of each aspect of the propping agent, wherein the central aggregate is made into a light porous shape by using the pore-forming agent, and the propping material wraps the central aggregate to make up for the deficiency of the strength of the central aggregate, so that the propping agent has higher strength. The proppant is low in overall weight and density, is easy to suspend in upper cracks of a horizontal well, and the setting of the coating material can improve the horizontal migration capacity of the proppant.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. Thus, the following detailed description of the embodiments of the present application is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used to indicate an orientation or positional relationship at which the article of the application is conventionally placed, this is done merely for the purpose of describing the application and simplifying the description, and it is not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be considered as limiting the application.
Example 1:
a petroleum fracturing propping agent for a horizontal well is characterized in that: from inside to outside, the mass ratio is 20-35: 5-10 of central aggregate, support material and coating material, wherein the central aggregate comprises 75-92wt% of quartz sand and 8-15wt% of pore-forming agent, the support material comprises 85-90wt% of bauxite, 4-8wt% of bentonite, 1-5wt% of manganese dioxide and 1-6wt% of magnesium powder, and the coating material comprises one or more of polytetrafluoroethylene, phenolic resin and epoxy resin.
According to the method, the quartz sand is used as a raw material of the central aggregate, the central aggregate is made to form a porous structure by using the pore-forming agent, the density of the central aggregate is reduced, and the density of the proppant is also reduced under the condition that the whole particle size of the proppant is unchanged. Bauxite serving as a main raw material serving as a supporting material and bentonite serving as an adhesive ensure that the supporting agent has high strength. The raw material with the hydrophobic and oleophobic properties is adopted as the film coating material, so that the horizontal migration speed of the propping agent is improved.
In addition, a concrete raw material proportioning example of the proppant is provided as follows: the mass ratio of the central aggregate to the support to the coating material is 30.
In the embodiment, preferably, agricultural wastes can be used as the pore-forming agent, and the pore-forming agent is one or more of rice hulls, straws and sawdust. Because the central aggregate is protected by the supporting material and the film coating material, the requirement of low density is emphasized more, and the supporting material provides guarantee in the aspect of strength, the agricultural wastes with lower cost, such as rice husk straws and the like, can be used as pore-forming agents to form pores with larger diameters.
Example 2:
in this embodiment, further optimization and limitation are performed on the basis of embodiment 1.
A preparation method of a petroleum fracturing propping agent for a horizontal well is characterized by comprising the following steps: the method comprises the following steps:
s1, respectively grinding quartz sand, a pore-forming agent, bauxite, bentonite, manganese dioxide and magnesium powder into powder and sieving the powder with a 200-mesh sieve;
s2, preparing spherical granular central aggregate by using the quartz sand obtained in the S1 and a pore-forming agent according to the proportion of 75-92;
the preparation of the central aggregate comprises the following steps:
s2.1, uniformly mixing the quartz sand obtained in the S1 with a pore-forming agent;
s2.2, adding water into the mixture obtained in the S2.1 for granulation;
s2.3, drying the particles obtained in the S2.2 at low temperature under the vacuum condition of 100-150 ℃ until the water content is lower than 5%;
and S2.4, sintering the particles obtained from the S2.3 at the temperature of 1000-1200 ℃ for 1-2 hours, and then cooling the particles in the furnace to the normal temperature.
S3, uniformly mixing the bauxite, the bentonite, the manganese dioxide and the magnesium powder obtained in the step S1 according to a weight ratio of 85-90;
s4, drying the particles obtained in the step S3 and sintering the particles into a primary finished product;
s5, screening the primary finished product in the S4 to obtain a secondary finished product;
s6, adding the secondary finished product into a liquid prepared from one or more of polytetrafluoroethylene emulsion, phenolic resin emulsion and epoxy resin emulsion and stirring;
and S7, cooling and screening to obtain the proppant.
In this embodiment, after the granulation, the central aggregate is further subjected to drying and sintering processes, and then is mixed with the support material, so that the loose and porous central aggregate is ensured to be formed and positioned in the innermost layer, strength reduction caused by undefined layering with the support material is avoided, then the central aggregate and the support material are dried and sintered together to form particles, and finally the particles are coated with a film, so that the surface characteristics of the support are improved.
In this embodiment, preferably, the method for preparing the particulate matter by using the mixture and the central aggregate in the step S3 is as follows: soaking granular central aggregate, and granulating together with the mixture in a disc granulator.
Example 3:
in this embodiment, further optimization and limitation are performed on the basis of embodiment 2.
Drying the particles in the step S4 at 200-300 ℃ under vacuum, sintering for 4-6 hours at 1200-1300 ℃ and keeping the temperature for 0.5-1 hour, and finally naturally cooling to below 80 ℃. The grain diameter of the secondary finished product is within the range of 0.4-0.7 mm. The particle size of the proppant is 0.6-0.8mm.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (8)
1. A petroleum fracturing propping agent for a horizontal well is characterized in that: from inside to outside, the mass ratio is 20-35: 5-10 parts of central aggregate, support material and coating material, wherein the central aggregate comprises 75-92wt% of quartz sand and 8-15wt% of pore-forming agent, the support material comprises 85-90wt% of bauxite, 4-8wt% of bentonite, 1-5wt% of manganese dioxide and 1-6wt% of magnesium powder, and the coating material comprises one or more of polytetrafluoroethylene, phenolic resin and epoxy resin.
2. The petroleum fracturing proppant for horizontal wells as claimed in claim 1, wherein: the pore-forming agent is one or more of rice hulls, straws and sawdust.
3. A preparation method of a petroleum fracturing propping agent for a horizontal well is characterized by comprising the following steps: the method comprises the following steps:
s1, respectively grinding quartz sand, a pore-forming agent, bauxite, bentonite, manganese dioxide and magnesium powder into powder and sieving the powder with a 200-mesh sieve;
s2, preparing spherical granular central aggregate by using the quartz sand obtained in the S1 and a pore-forming agent according to the proportion of 75-92;
s3, uniformly mixing the bauxite, the bentonite, the manganese dioxide and the magnesium powder obtained in the step S1 according to a weight ratio of 85-90;
s4, drying the particles obtained in the step S3 and sintering the particles into a primary finished product;
s5, screening the primary finished product in the S4 to obtain a secondary finished product;
s6, adding the secondary finished product into a liquid prepared from one or more of polytetrafluoroethylene emulsion, phenolic resin emulsion and epoxy resin emulsion and stirring;
and S7, cooling and screening to obtain the proppant.
4. The preparation method of the petroleum fracturing propping agent for the horizontal well according to claim 3, characterized by comprising the following steps: the preparation of the central aggregate comprises the following steps:
s2.1, uniformly mixing the quartz sand obtained in the S1 with a pore-forming agent;
s2.2, adding water into the mixture obtained in the S2.1 for granulation;
s2.3, drying the particles obtained in the S2.2 at low temperature under the vacuum condition of 100-150 ℃ until the water content is lower than 5%;
and S2.4, sintering the particles obtained from the S2.3 at the temperature of 1000-1200 ℃ for 1-2 hours, and then cooling the particles in the furnace to the normal temperature.
5. The preparation method of the petroleum fracturing propping agent for the horizontal well according to claim 4, characterized by comprising the following steps: the method for preparing the particulate matters from the mixture and the central aggregate in the step S3 comprises the following steps: the granular central aggregate after being soaked is put into a disc granulator together with the mixture for granulation.
6. The preparation method of the petroleum fracturing propping agent for the horizontal well according to claim 3, characterized by comprising the following steps: drying the particles in the step S4 at 200-300 ℃ under vacuum, sintering for 4-6 hours at 1200-1300 ℃ and keeping the temperature for 0.5-1 hour, and finally naturally cooling to below 80 ℃.
7. The preparation method of the petroleum fracturing propping agent for the horizontal well as claimed in claim 3, characterized in that: the grain diameter of the secondary finished product is within the range of 0.4-0.7 mm.
8. The preparation method of the petroleum fracturing propping agent for the horizontal well as claimed in claim 3, characterized in that: the particle size of the proppant is 0.6-0.8mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210909617.XA CN115418213A (en) | 2022-07-29 | 2022-07-29 | Petroleum fracturing propping agent for horizontal well and preparation method thereof |
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| CN202210909617.XA CN115418213A (en) | 2022-07-29 | 2022-07-29 | Petroleum fracturing propping agent for horizontal well and preparation method thereof |
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