CN114316931A - Selective organic particle plugging agent for high-temperature high-salinity fractured oil reservoir and preparation method thereof - Google Patents
Selective organic particle plugging agent for high-temperature high-salinity fractured oil reservoir and preparation method thereof Download PDFInfo
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- 239000011146 organic particle Substances 0.000 title claims abstract description 21
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 98
- 239000002245 particle Substances 0.000 claims abstract description 53
- 239000002131 composite material Substances 0.000 claims abstract description 19
- 239000002270 dispersing agent Substances 0.000 claims abstract description 18
- 239000011347 resin Substances 0.000 claims abstract description 17
- 229920005989 resin Polymers 0.000 claims abstract description 17
- 238000001125 extrusion Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 7
- 239000000843 powder Substances 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 6
- 230000008961 swelling Effects 0.000 claims description 5
- 238000000498 ball milling Methods 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- 238000010008 shearing Methods 0.000 claims description 4
- 229920001169 thermoplastic Polymers 0.000 claims description 4
- 239000004416 thermosoftening plastic Substances 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 239000004115 Sodium Silicate Substances 0.000 claims description 3
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 3
- 239000000440 bentonite Substances 0.000 claims description 3
- 229910000278 bentonite Inorganic materials 0.000 claims description 3
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims description 3
- FQENQNTWSFEDLI-UHFFFAOYSA-J sodium diphosphate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]P([O-])(=O)OP([O-])([O-])=O FQENQNTWSFEDLI-UHFFFAOYSA-J 0.000 claims description 3
- 235000019333 sodium laurylsulphate Nutrition 0.000 claims description 3
- 229940048086 sodium pyrophosphate Drugs 0.000 claims description 3
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 3
- 235000019794 sodium silicate Nutrition 0.000 claims description 3
- 235000019832 sodium triphosphate Nutrition 0.000 claims description 3
- 229920000247 superabsorbent polymer Polymers 0.000 claims description 3
- 235000019818 tetrasodium diphosphate Nutrition 0.000 claims description 3
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims description 3
- 239000010455 vermiculite Substances 0.000 claims description 3
- 229910052902 vermiculite Inorganic materials 0.000 claims description 3
- 235000019354 vermiculite Nutrition 0.000 claims description 3
- 239000012761 high-performance material Substances 0.000 claims 4
- 239000011521 glass Substances 0.000 claims 2
- 239000003607 modifier Substances 0.000 claims 2
- 230000007613 environmental effect Effects 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 33
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- 230000015784 hyperosmotic salinity response Effects 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 27
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- 238000009826 distribution Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 235000012438 extruded product Nutrition 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000003350 kerosene Substances 0.000 description 3
- 239000012752 auxiliary agent Substances 0.000 description 2
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- RECVMTHOQWMYFX-UHFFFAOYSA-N oxygen(1+) dihydride Chemical compound [OH2+] RECVMTHOQWMYFX-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention relates to a selective organic particle profile control agent for a high-temperature high-salinity fractured reservoir and a preparation method thereof. 80-90% of main agent selected from high-softening-point oil-soluble resin; 5% -10% of an expanding agent, which is a material capable of effectively expanding when heated or water; 3 to 6 percent of density regulator, which is a material for regulating the density of the selective composite organic particle plugging agent; 2-4% of dispersing agent, can ensure the effective dispersion of the plugging agent particles in water, and reduce the system settlement and aggregation. The particle size parameter of the plugging agent can be optimized between micron and millimeter, the density can be adjusted, the formed particle plugging agent has good temperature resistance and salt tolerance, good oil-water selectivity is achieved, the water phase plugging rate reaches more than 83%, the oil phase plugging rate is about 15%, flow channels of a reservoir can be adjusted, and the prospect is promising in the flow channel adjustment and water and oil plugging direction of a fractured reservoir.
Description
Technical Field
The invention belongs to the technical field of oilfield chemistry, and particularly relates to a selective organic particle plugging agent for a high-temperature high-salinity fractured reservoir and a preparation method thereof.
Background
The fracture type oil deposit occupies an important position in the development of oil and gas fields in the world due to higher oil and gas reserves and oil and gas yield, different from sandstone oil fields, the fracture is an oil production channel of the oil deposit and a subsequent water outlet channel, and the plugging regulating measure of the fracture type oil deposit is substantially flow channel regulation between different fractures, namely: on one hand, the plugging agent is required to have enough plugging strength to resist the subsequent flushing of formation water, and on the other hand, an oil production channel is ensured not to be polluted to achieve the effect of plugging less water and less oil. At present, common plugging regulators mainly comprise gel plugging regulators and polymer particle plugging regulators, after the plugging regulators enter a stratum, the plugging regulators are easily diluted by stratum water in cracks to cause too low plugging strength, and meanwhile, under the condition of a high-temperature and high-salt oil reservoir, the cross-linking gelling/swelling adhesion reaction is too fast, so that the deep flow regulation of a system cannot be realized, and the stability is poor.
Therefore, there is a strong need in the art for a plugging agent for high-temperature high-salinity fractured reservoirs that can solve the above problems.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a selective organic particle plugging agent for a high-temperature high-salinity fractured reservoir and a preparation method thereof. The invention solves the problems that the existing plugging adjusting system is easy to dilute, low in strength, poor in oil-water selectivity, weak in stability under high temperature and high salt conditions and the like.
The invention is realized by the following technical scheme:
in one aspect, the invention provides a selective organic particle profile control agent, which comprises the following components as raw materials in percentage by mass: the composite material consists of 80-90% of oil-soluble resin, 5-10% of expanding agent, 3-6% of density regulator and 2-4% of dispersant.
The selective organic particle plugging agent is prepared by adopting a double-screw extrusion process, takes oil-soluble resin, an expanding agent, a density regulator and a dispersing agent as raw materials, and obtains a uniform organic composite material after mixing, extrusion, ball milling/crushing procedures, and the uniform organic composite material has controllable particle size, strong oil-water selectivity and similar density to water.
In the selective organic particulate plugging agent of the present invention, the oil-soluble resin is a thermoplastic high softening point oil-soluble resin.
Further, the swelling agent is one or more of bentonite, super absorbent polymer and thermosensitive expanded graphite, which can effectively swell when being heated or water.
Further, the density regulator is one or more of expanded perlite powder and vermiculite powder.
Further, the dispersing agent is one or more of sodium silicate, sodium tripolyphosphate, sodium pyrophosphate and sodium dodecyl sulfate.
On the other hand, the invention provides a preparation method of the selective organic particle profile control and plugging agent, namely, after the main agent and the auxiliary agent enter the double screws in the hopper, the main agent and the auxiliary agent are continuously blended under the shearing, friction and basic action of the double screws, and finally, the uniform multifunctional organic composite material is formed.
The specific steps for preparing the selective organic particle plugging agent are as follows:
calculating the proportion of various materials according to the densities of a main agent material (oil-soluble resin) and auxiliary materials (an expanding agent, a density regulator and a dispersing agent) by combining the interaction relationship among the materials to ensure that the mixture is equal to or close to the density of the formation water, and uniformly mixing the materials, wherein the mass percentages of the main agent material and the three auxiliary materials are 80-90%, 5-10%, 3-6% and 2-4% respectively;
opening the extruder, and raising the temperature of the extruder body to be above the softening point of the material, generally 160-250 ℃; setting the screw rotating speed and the feeding speed of the extruder according to the predicted output, and performing trial extrusion; after the trial extrusion is stable, products in the previous stage are replaced, and the influence of the last material extrusion is eliminated; forming a linear organic composite material which meets the requirement and has a certain diameter;
furthermore, according to the requirements of oil reservoir physical parameters and pipe column conditions on the particle size of the particle plugging agent, a ball milling process and a high-speed shearing process are adopted to manufacture micron-millimeter-sized small particles for the material.
The purpose of the invention is realized as follows: the oil-soluble resin used as the main agent for preparing the selective organic particle profile control plugging agent is a thermoplastic system, has a good temperature resistance effect and oil solubility, can achieve the effect that the plugging agent blocks water and does not block oil by adding the expanding agent which can slowly expand when being heated or being wetted, and endows the profile control plugging agent with oil-water selectivity; on the other hand, the density regulator and the dispersant have synergistic effect, so that the density of the particle plugging regulator is adjusted to be similar to that of the formation water, and meanwhile, the plugging agent is effectively dispersed in the water, so that the sedimentation and aggregation are reduced, the particle plugging regulator can be better carried by the formation water to move to the deep part of a reservoir stratum, and the deep flow regulation effect is realized; and the particle size of the particle plugging agent is controlled, so that the particle plugging agent has better injectability.
Compared with the prior art, the invention has the advantages that:
(1) the plugging agent is solid particles, is in a uniformly dispersed state after being stirred in water at normal temperature, is not agglomerated or precipitated, and is convenient to use on site.
(2) The particle profile control and plugging agent has the advantages of adjustable particle size from micron to millimeter, density similar to that of injected water and expandable adhesion of particles in high-temperature water, and can be used for flow control, water plugging and other processes in oilfield production stabilizing and increasing measures.
(3) The flow regulating agent is mixed and aged with simulated high-salt formation water and kerosene respectively at the temperature of 90 ℃, a sample bottle is slightly shaken after 7 days, most of the flow regulating agent is dissolved in the kerosene, a small amount of residual micro particles are dispersed in the kerosene, and the flow regulating agent in water is adhered to form a conglomerate with a certain scale, so that the flow regulating agent has good temperature resistance and salt resistance and has good oil-water selectivity.
(4) The particle size and the system density of the plugging agent can be adjusted, the particle size range is micron-sized to millimeter-sized, and the system density is equal to or similar to the density of formation water. Can be adjusted according to the pore throat of the reservoir and the condition of formation fluid.
Detailed Description
The technical scheme of the invention is further explained by combining specific examples.
The invention is further described below with reference to specific examples, but the scope of the invention as claimed is not limited to the scope referred to in the examples.
Test method
(1) Oil-water selectivity determination method
The wetting angle of the plugging agent is determined according to a pendant drop method in the industrial standard SY/T5370-1999 surface and interfacial tension determination method, and the oil-water selectivity of the plugging agent is judged according to the size of the wetting angle.
(2) Particle size measuring method
And (4) screening and determining the particle size of the particle plugging agent by using a high-mesh screen.
(3) Density measuring method
The density of the raw material components is determined according to the regulations of the national standard GB/T4472-2011 'determination of density and relative density of chemical products'.
Example 1:
a selective organic particle plugging agent for a fractured reservoir and a preparation method thereof are provided, and the preparation method comprises the following steps: oil-soluble granular resin, an expanding agent, a density regulator and a dispersant.
The preparation method comprises the following steps:
opening a high-temperature double-screw extruder, preheating the temperature of a screw body to 175 ℃, keeping the temperature constant, uniformly mixing 86.1g of oil-soluble granular resin, 5.7g of expanding agent, 4.9g of density regulator and 3.3g of dispersing agent, and then adding the mixture into a hopper at a constant speed; and (3) setting the rotating speed of a screw of the extruder to be 600r/min for trial extrusion, and replacing the early-stage extruded product after the trial extrusion is stable to obtain the linear organic composite material.
According to the requirements of physical parameters of a target oil reservoir and pipe column conditions on the particle size of the particle plugging agent, the rotating speed of a cylinder of a ball mill is set to be 38r/min, the high-speed pulverizer pulverizes for 10min, the linear organic composite materials are sequentially processed and ground, and particle powder is further sieved through a high-mesh screen, so that the micron-sized selective oil-soluble plugging agent small particles D1 are obtained. The density of the particle plugging agent is 1.027g/cm3The contact angle of the organic selective plugging agent material and a water drop is 96.2 degrees, the contact angle of the organic selective plugging agent material and the oil drop is 9.8 degrees, and the particle size distribution is 1-50 mu m.
Example 2:
a selective organic particle plugging agent for a fractured reservoir and a preparation method thereof are provided, and the preparation method comprises the following steps: oil-soluble granular resin, an expanding agent, a density regulator and a dispersant.
The preparation method comprises the following steps:
opening a high-temperature double-screw extruder, preheating the temperature of a screw body to 175 ℃, keeping the temperature constant, uniformly mixing 85.1g of oil-soluble granular resin, 6.3g of expanding agent, 5.7g of density regulator and 2.9g of dispersing agent, and then adding the mixture into a hopper at a constant speed; and (3) setting the rotating speed of a screw of the extruder to be 550r/min for trial extrusion, and replacing the early-stage extruded product after the trial extrusion is stable to obtain the linear organic composite material.
Setting the rotating speed of a cylinder of a ball mill to be 38r/min and the crushing time of a high-speed crusher to be 8min according to the requirements of physical parameters of a target oil reservoir and pipe column conditions on the particle size of the particle plugging agent, sequentially processing and grinding the linear organic composite material, and further sieving particle powder through a high-mesh screen to obtain the micron-sized selected particleAnd selective oil plugging agent small particles D2. The density of the particle plugging agent is 1.031g/cm3The contact angle of the organic selective plugging agent material and a water drop is 96.7 degrees, the contact angle of the organic selective plugging agent material and an oil drop is 9.1 degrees, and the particle size distribution is 50-150 mu m.
Example 3:
a selective organic particle plugging agent for a fractured reservoir and a preparation method thereof are provided, and the preparation method comprises the following steps: oil-soluble granular resin, an expanding agent, a density regulator and a dispersant.
The preparation method comprises the following steps:
opening a high-temperature double-screw extruder, preheating the temperature of a screw body to 175 ℃, keeping the temperature constant, uniformly mixing 83.9g of oil-soluble granular resin, 7.0g of expanding agent, 5.6g of density regulator and 3.5g of dispersing agent, and then adding the mixture into a hopper at a constant speed; and (3) setting the rotating speed of a screw of the extruder to be 550r/min for trial extrusion, and replacing the early-stage extruded product after the trial extrusion is stable to obtain the linear organic composite material.
According to the requirements of physical parameters of a target oil reservoir and pipe column conditions on the particle size of the particle plugging agent, the rotating speed of a cylinder of a ball mill is set to be 36r/min, the high-speed pulverizer pulverizes for 7min, the linear organic composite materials are sequentially processed and ground, and particle powder is further sieved through a high-mesh screen, so that the micron-sized selective oil-soluble plugging agent small particles D3 are obtained. The density of the particle plugging agent is 1.033g/cm3The contact angle of the organic selective plugging agent material and a water drop is 97.3 degrees, the contact angle of the organic selective plugging agent material and the oil drop is 8.8 degrees, and the particle size distribution is 150-300 mu m.
Example 4:
a selective organic particle plugging agent for a fractured reservoir and a preparation method thereof are provided, and the preparation method comprises the following steps: oil-soluble granular resin, a swelling agent and a density regulator.
The preparation method comprises the following steps:
opening a high-temperature double-screw extruder, preheating the temperature of a screw body to 180 ℃, keeping the temperature constant, uniformly mixing 84.9g of oil-soluble granular resin, 5.1g of expanding agent, 6.0g of density regulator and 4.0g of dispersing agent, and then adding the mixture into a hopper at a constant speed; and (3) setting the rotating speed of a screw of the extruder to be 500r/min for trial extrusion, and replacing the early-stage extruded product after the trial extrusion is stable to obtain the linear organic composite material.
According to the requirements of physical parameters of a target oil reservoir and pipe column conditions on the particle size of the particle plugging agent, the rotating speed of a cylinder of a ball mill is set to be 36r/min, the high-speed pulverizer pulverizes for 5min, the linear organic composite materials are sequentially processed and ground, and then particle powder is further sieved through a high-mesh screen, so that the micron-sized selective oil plugging agent small particles D4 are obtained. The density of the granular plugging agent is 1.041g/cm3The contact angle of the organic selective plugging agent material and a water drop is 95.5 degrees, the contact angle of the organic selective plugging agent material and the oil drop is 10.9 degrees, and the particle size distribution is 300-1000 mu m.
Example 5:
the selective organic particle plugging agent and water are compounded to obtain a 0.5% aqueous solution, experimental water is simulated water, the composition is shown in table 1, experimental crude oil is JZ9-3 crude oil produced in an oil field, the experimental temperature is 90 ℃, experimental fracture rock cores are columnar sandstone rock cores and are prepared by splitting wall surfaces, and the plugging experimental result is shown in table 2:
TABLE 1 simulated formation Water ion composition and degree of mineralization
The density of the simulated water is measured to be about 1.03g/cm3。
TABLE 2 Selective organic particulate plugging agent plugging experiment
As can be seen from Table 2, the selective organic particle plugging agent has good oil-water selectivity and high water plugging rate, can meet the requirements of high-temperature and high-salt fractured oil fields, has the advantages of adjustable system particle size and density, and is convenient for injection in construction sites.
The invention has been described in an illustrative manner, and it is to be understood that any simple variations, modifications or other equivalent changes which can be made by one skilled in the art without departing from the spirit of the invention fall within the scope of the invention.
Claims (10)
1. The selective organic particle profile control agent for the high-temperature high-salinity fractured oil reservoir is characterized by comprising the following components in parts by weight: the raw materials are counted by mass percent: the composite material consists of 80-90% of oil-soluble particles, 5-10% of an expanding agent, 3-6% of a density regulator and 2-4% of a dispersing agent, wherein: oil-soluble particles are used as a main agent, are converted into viscous state from glass state and high elastic state at the set environmental temperature of a double-screw extruder, are simultaneously subjected to double influences of shearing force and extrusion force, are fully mixed with an expanding agent, a density regulator and a dispersing agent and are continuously conveyed to the front end of the double-screw extruder, and are finally extruded and sheared into a composite high-performance material continuum in a specific form; the selective organic particle plugging agent is obtained by performing ball milling/high-speed crushing process and high-mesh screen screening on a composite high-performance material continuum manufactured by a double-screw extruder.
2. The selective organic particulate plugging agent of claim 1 wherein: the oil-soluble particles are thermoplastic high-softening-point oil-soluble resin.
3. The selective organic particulate plugging agent of claim 1 wherein the swelling agent is one or more of bentonite, a superabsorbent polymer or a thermally sensitive expanded graphite.
4. The selective organic particulate plugging agent of claim 1 wherein the density modifier is one or more of expanded perlite powder or vermiculite powder.
5. The selective organic particulate plugging agent of claim 1 wherein the dispersant is one or more of sodium silicate, sodium tripolyphosphate, sodium pyrophosphate, or sodium lauryl sulfate.
6. A preparation method of a selective organic particle plugging agent for a high-temperature high-salinity fractured reservoir is characterized by comprising the following steps of: taking 80-90% by mass of oil-soluble particles as a main agent, converting the oil-soluble particles from a glass state and a high-elastic state into a viscous state at a set environment temperature of a double-screw extruder, and simultaneously, fully mixing the oil-soluble particles, 5-10% by mass of an expanding agent, 3-6% by mass of a density regulator and 2-4% by mass of a dispersing agent under the double-screw extruder, continuously conveying the mixture to the front end of the double-screw extruder, and finally extruding and shearing the mixture into a composite high-performance material continuous body in a specific form; the selective organic particle plugging agent is obtained by performing ball milling/high-speed crushing process and high-mesh screen screening on a composite high-performance material continuum manufactured by a double-screw extruder.
7. The selective organic particulate plugging agent of claim 6 wherein: the oil-soluble particles are thermoplastic high-softening-point oil-soluble resin.
8. The selective organic particulate plugging agent of claim 6 wherein the swelling agent is one or more of bentonite, a superabsorbent polymer or a thermally sensitive expanded graphite.
9. The selective organic particulate plugging agent of claim 6 wherein the density modifier is one or more of expanded perlite powder or vermiculite powder.
10. The selective organic particulate plugging agent of claim 6 wherein the dispersant is one or more of sodium silicate, sodium tripolyphosphate, sodium pyrophosphate, or sodium lauryl sulfate.
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| CN202111387842.3A CN114316931A (en) | 2021-11-22 | 2021-11-22 | Selective organic particle plugging agent for high-temperature high-salinity fractured oil reservoir and preparation method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107739599A (en) * | 2017-10-13 | 2018-02-27 | 东营威固石油技术有限公司 | A kind of high temperature low-density water shutoff agent and preparation method thereof and onsite application method |
| CN109439300A (en) * | 2018-10-19 | 2019-03-08 | 中国石油大学(华东) | Adjust stream agent particle, adjust stream agent and its preparation method and application |
| CN109486475A (en) * | 2017-09-13 | 2019-03-19 | 北京中天富源石油化工技术有限公司 | A kind of high temperature plugging agent and preparation method thereof |
| CN111793485A (en) * | 2020-08-13 | 2020-10-20 | 陕西安诺瑞特石油科技有限公司 | Water plugging agent and preparation method and application thereof |
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2021
- 2021-11-22 CN CN202111387842.3A patent/CN114316931A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109486475A (en) * | 2017-09-13 | 2019-03-19 | 北京中天富源石油化工技术有限公司 | A kind of high temperature plugging agent and preparation method thereof |
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| CN109439300A (en) * | 2018-10-19 | 2019-03-08 | 中国石油大学(华东) | Adjust stream agent particle, adjust stream agent and its preparation method and application |
| CN111793485A (en) * | 2020-08-13 | 2020-10-20 | 陕西安诺瑞特石油科技有限公司 | Water plugging agent and preparation method and application thereof |
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| Title |
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| 郑超: "堵水用树脂分散体研究", 《中国石油大学（华东）硕士学位论文》 * |
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Application publication date: 20220412 |