CN114163984A - Selection of selective water shutoff agent for oil well and water shutoff method - Google Patents
Selection of selective water shutoff agent for oil well and water shutoff method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 22
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- 229920000642 polymer Polymers 0.000 claims abstract description 17
- 239000013535 sea water Substances 0.000 claims abstract description 10
- 239000003921 oil Substances 0.000 claims description 24
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 20
- 229920002401 polyacrylamide Polymers 0.000 claims description 7
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- 229920002873 Polyethylenimine Polymers 0.000 claims description 5
- WYYQVWLEPYFFLP-UHFFFAOYSA-K chromium(3+);triacetate Chemical compound [Cr+3].CC([O-])=O.CC([O-])=O.CC([O-])=O WYYQVWLEPYFFLP-UHFFFAOYSA-K 0.000 claims description 5
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims description 5
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- 229910000271 hectorite Inorganic materials 0.000 claims description 5
- 229910052901 montmorillonite Inorganic materials 0.000 claims description 5
- 229920001568 phenolic resin Polymers 0.000 claims description 5
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- 235000010493 xanthan gum Nutrition 0.000 claims description 3
- 239000000230 xanthan gum Substances 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 2
- 239000007864 aqueous solution Substances 0.000 claims 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
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/512—Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
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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
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/5045—Compositions based on water or polar solvents containing inorganic compounds
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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
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
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- 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
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/514—Compositions based on water or polar solvents containing organic compounds macromolecular compounds of natural origin, e.g. polysaccharides, cellulose
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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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- 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
- E21B33/138—Plastering the borehole wall; Injecting into the formation
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- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/10—Nanoparticle-containing well treatment fluids
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Abstract
The invention provides a selective water shutoff agent selection and water shutoff method for an oil well, and relates to the field of oilfield chemistry. A selective water shutoff agent selecting and water shutoff method is mainly prepared from the following components in percentage by mass: 0.1-0.4% of nano material, 0.2-1.0% of polymer, 0.2-1.0% of cross-linking agent and the balance of nano-filtered seawater. The selective water shutoff agent for the oil well is prepared from the raw materials, has a simple preparation process, can adjust final setting time within 16h, has a plugging rate of less than 30% for an oil phase and a plugging rate of more than 88% for a water phase, has good selective plugging capability, and can meet the water shutoff requirement of the oil field.
Description
Technical Field
The invention relates to the field of oilfield chemistry for improving recovery efficiency, in particular to a selective water shutoff agent selection and water shutoff method.
Background
During the development of oil fields, the produced water from oil reservoirs can bring about a plurality of serious influences to the development work of oil fields, such as: the energy loss of the stratum, the yield reduction, the increase of the water treatment cost, the corrosion of equipment and the like. Therefore, the method for plugging the water in the high-water-content oil field becomes an effective means for cost reduction and efficiency improvement of the oil field.
The purpose of water shutoff is to control the flow of water in a water producing layer and change the flow direction of water in water displacement, improve the water displacement efficiency, try to make the water yield of an oil field decline or stable within a period of time, so as to ensure the yield increase or stable yield of the oil field and improve the final recovery ratio of the oil field. However, most of plugging agents in the market are injected into the stratum in a general mode, and after entering the stratum, the oil layer is easy to block by mistake due to poor oil-water selective plugging capability, so that the research and development of a plugging agent which is easy to pump, has certain strength and strong oil-water selective plugging capability is urgently needed.
Disclosure of Invention
Aiming at the problem of poor oil-water selective plugging capability of a plugging agent, the invention provides a selection method of a selective water plugging agent for an oil well and a water plugging method, which have the advantages of salt resistance, easiness in pumping and good elasticity, have stronger selective plugging capability on oil and water, reduce the damage of mistaken plugging on an oil layer and improve the oil yield.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention relates to a selective water shutoff agent for an oil well, which is mainly prepared from the following components in percentage by mass: 0.1-0.4% of nano material, 0.2-1.0% of polymer, 0.2-1.0% of cross-linking agent and the balance of nano-filtered seawater.
The nano material is at least one of silicon dioxide, montmorillonite and hectorite; the polymer is any one of xanthan gum, acrylamide and polyacrylamide; the crosslinking agent is at least one of chromium acetate, polyethyleneimine and phenolic resin.
The invention also provides a selective water shutoff agent selection and water shutoff method, and the preparation method mainly comprises the following steps:
s1: dissolving a certain mass percentage of nano materials in 90ml of nanofiltration seawater, setting the rotating speed at 400r/min, and stirring until the nano materials are fully dissolved;
s2: after the nano material is fully stirred and dissolved, adding the polymer, setting the rotating speed at 300-. Diluting the cross-linking agent in 10ml of nanofiltration seawater, and adding the diluted cross-linking agent into the stirred polymer solution to prepare the initial mother solution of the oil-water selective plugging agent.
In the steps, the mass percent is calculated according to 100ml, and only a small part of solution is reserved in advance for diluting the cross-linking agent.
The selection and water plugging method of the selective water plugging agent for the oil well, provided by the invention, has the effective benefits that: the plugging rate to oil phase in the stratum of about 500mD is less than 30%, the plugging rate to water phase and water phase in the stratum is more than 88%, and the stratum has stronger oil-water selective plugging performance; the invention is easy to pump, salt-resistant, has certain strength and can meet the water plugging requirement of an oil well.
Has the advantages that:
compared with the prior art, the invention has the following beneficial effects:
the plugging rate to oil phase is less than 30%, the plugging rate to water phase of formation water is more than 88%, and the plugging agent shows stronger oil-water selective plugging performance; the invention is easy to pump, salt-resistant, has certain strength and can meet the water plugging requirement of an oil well.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and that for those skilled in the art, other relevant drawings can be obtained according to the drawings without inventive effort, wherein:
FIG. 1 is a graph of the ratio of the elastic modulus to the viscous modulus of the plugging agents of examples 1, 2, 3 and 4 of the present invention versus the change in shear frequency;
FIG. 2 is a graph of the oil phase blocking ratio versus displacement PV number for the example 1 blocking agent of the present invention;
FIG. 3 is a graph showing the change of the blocking rate of the water phase versus the displacement PV number of the blocking agent in example 1 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example (b):
the following is a detailed description of the selection of the selective water shutoff agent and the water shutoff method according to the embodiment of the present invention.
A selective water shutoff agent selecting and water shutoff method is mainly prepared from the following components in percentage by mass: 0.1-0.4% of nano material, 0.2-1.0% of polymer, 0.2-1.0% of cross-linking agent and the balance of nano-filtered seawater.
The nano material is at least one of silicon dioxide, montmorillonite and hectorite; the polymer is any one of xanthan gum, acrylamide and polyacrylamide; the crosslinking agent is at least one of chromium acetate, polyethyleneimine and phenolic resin.
The invention also provides a selective water shutoff agent selecting and water shutoff method, which mainly comprises the following steps:
s1: dissolving a certain mass percentage of nano materials in 90ml of nanofiltration seawater, setting the rotating speed at 400r/min, and stirring until the nano materials are fully dissolved;
s2: after the nano material is fully stirred and dissolved, adding the polymer, setting the rotating speed at 300-. Diluting the cross-linking agent in 10ml of nanofiltration seawater, adding the diluted cross-linking agent into the stirred polymer solution, and preparing the initial mother solution of the plugging agent with good oil-water selective plugging.
In the steps, the mass percent is calculated according to 100ml, and only a small part of solution is reserved in advance for diluting the cross-linking agent.
In the present invention, the Gel Strength determination method is based on the visual code table of Gel Strength Codes (GSC for short) of Sydansk et al (1988), see Table 1. All gel strength ratings in the present invention were determined according to the data provided in table 1.
Table 1 gel strength visual code standard
The features and properties of the present invention will be described in further detail with reference to examples.
Example 1:
the preparation method of the selective water shutoff agent selecting and water shutoff method of the embodiment is executed according to steps S1 and S2, and specifically comprises the following steps by mass percent: 0.1-0.4% of nano material (silicon dioxide), 0.2-1.0% of polymer (polyacrylamide) and 0.2-1.0% of cross-linking agent (polyethyleneimine).
Example 2:
the embodiment provides a method for selecting and plugging a selective water plugging agent for an oil well, which is implemented according to steps S1 and S2, and specifically comprises the following steps in percentage by mass: 0.1-0.4% of nano material (the mass ratio of hectorite to silicon dioxide is 2:1), 0.2-1.0% of polymer (the mass ratio of polyacrylamide to acrylamide is 3:1), and 0.2-1.0% of cross-linking agent (the mass ratio of polyethyleneimine to chromium acetate is 3: 1).
Example 3:
the embodiment provides a method for selecting and plugging a selective water plugging agent for an oil well, which is implemented according to steps S1 and S2, and specifically comprises the following steps in percentage by mass: 0.1-0.4% of nano material (the mass ratio of hectorite to montmorillonite is 2:1), 0.2-1.0% of polymer (the mass ratio of polyacrylamide to acrylamide is 3:1), and 0.2-1.0% of cross-linking agent (the mass ratio of phenolic resin to chromium acetate is 3: 1).
Example 4:
the embodiment provides a method for selecting and plugging a selective water plugging agent for an oil well, which is implemented according to steps S1 and S2, and specifically comprises the following steps in percentage by mass: 0.1-0.4% of nano material (the mass ratio of silicon dioxide to montmorillonite is 2:1), 0.2-1.0% of polymer (the mass ratio of polyacrylamide to acrylamide is 3:1), and 0.2-1.0% of cross-linking agent (phenolic resin).
Test example 1:
the initial viscosity of the oil-water phase selective plugging agent in example 1 was measured, and 10ml of the sample in example 1 was measured for its viscosity at normal temperature using a Brookfield viscometer.
Tests show that the initial viscosity of the mother solution in example 1 is 190mPa.s, the initial viscosity is low, the plugging agent has good injectivity, and the plugging agent enters the deep part of the stratum for plugging.
Test example 2:
the gelling performance of the selective plugging agent for the oil well in experimental example 1 was tested, the sample (100ml) of example 1 was poured into a temperature-resistant reagent bottle and sealed, and the bottle was put into an oven at 105 ℃ for aging, and the gelling result of the selective plugging agent for nanofiltration seawater base oil water was observed.
The gelling results of the nanofiltration seawater based oil water selective plugging agent in example 1 are shown in table 2.
Table 2 example 1 gel forming Properties of the final plugging agent
According to a gelling experiment, the plugging agent has good fluidity after being aged in a drying oven at 105 ℃ for 8 hours, so that the risk of downhole operation is avoided. After aging for 24, the system strength is over H, thus ensuring that the plugging agent has good plugging strength.
Test example 3:
the viscoelastic modulus of the plugging agents in the experimental examples 1, 2, 3 and 4 is tested, the samples (100ml) in the experimental examples 1, 2, 3 and 4 are poured into a reagent bottle to be sealed, then the reagent bottle is placed into an oven at 105 ℃ to be aged for 24h and then taken out, the viscoelastic modulus data of the plugging agents are tested by a Haake rheometer, and the viscoelastic modulus data are processed to obtain the relation between the viscoelastic modulus ratio and the shearing frequency.
The results of the viscoelastic modulus test are shown in fig. 1.
As can be seen from fig. 1, the viscoelastic ratio of the plugging agent is highest in the embodiment 1.
Test example 4:
the oil phase plugging performance of example 1 was tested. The plugging agent (0.3PV) in example 1 is injected into a sand filling pipe saturated with the simulation oil, after the injection, the sand filling pipe is sealed and put into a 105 ℃ oven for aging, after the curing is carried out for 24 hours, the reverse sand filling pipe is connected into a displacement device and is displaced with 10PV simulation oil, and the plugging rate of the plugging agent on the oil phase is tested. It is to be noted that the simulated oil used in test example 4 had a viscosity of 4.98mPa.s at 105 ℃ and the oil phase permeability of the sand pack pipe was 580 mD.
The results of the oil phase plugging rate are shown in FIG. 2.
Test example 5:
the aqueous phase plugging performance in example 1 was tested. The plugging agent (0.3PV) in example 1 is injected into a sand filling pipe saturated with formation water, the sand filling pipe is sealed after injection and is placed into a 105 ℃ oven for aging, after curing for 24 hours, the sand filling pipe is reversely connected into a displacement device to displace 10PV formation water, and the plugging rate of the plugging agent on the water phase is tested. It is noted that the formation water salinity used in test example 4 was 24984mg/L and the water phase permeability of the sand pack was 630 mD.
The results of the aqueous phase blocking ratio are shown in FIG. 3.
As can be seen from FIG. 3, the breakthrough pressure of the aqueous phase is 3.45MPa, which indicates that the plugging agent has a certain strength. After the plugging agent is breached, the pressure remains steady. From the results, the average blocking rate of the blocking agent to the water phase is kept at about 88.56%, and the blocking agent still has good water phase blocking effect and good scouring resistance after water flooding of 10 PV.
The selective water plugging agent for the oil well and the water plugging method provided by the invention are simple to prepare and are suitable for field preparation.
The embodiments described above are some, but not all embodiments of the invention. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. 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 invention.
Claims (7)
1. A selective water shutoff agent selection and water shutoff method for an oil well is mainly prepared from the following components in percentage by mass: 0.1-0.4% of nano material, 0.2-1.0% of polymer, 0.2-1.0% of cross-linking agent and the balance of nano-filtered seawater.
2. The selective water shutoff agent selecting and water shutoff method according to claim 1, characterized in that the nano material is at least one of silicon dioxide, montmorillonite and hectorite:
s1: the polymer is any one of xanthan gum, acrylamide and polyacrylamide;
s2: the crosslinking agent is at least one of chromium acetate, polyethyleneimine and phenolic resin.
3. The selective water shutoff agent as in claims 1-2, wherein the nanomaterial is first dissolved in an aqueous solution to form an ordered nano layer, which is then inserted into the polymer molecular chain to make the structure more compact and dense, and macroscopically exhibits higher strength and elasticity than conventional polymer gels.
4. The method of selecting and plugging a selective plugging agent as claimed in claims 1-2, wherein the initial viscosity is 195mpa.s, the initial viscosity is low, the pumping is easy, the plugging can be performed by entering the deep part of the stratum, and the sweep factor is enlarged.
5. The selective plugging agent according to claim 1-2, wherein the plugging agent with good selective plugging of oil and water has a higher elastic-to-viscosity ratio.
6. The selective plugging agent selection and final setting time of the plugging method according to claims 1-2, wherein the final setting time is 16h at 105 ℃, thereby avoiding the risk of wellbore plugging during downhole operations.
7. The selective plugging agent of claims 1-2 having a viscoelastic modulus, wherein the agent exhibits high elasticity and low viscosity properties.
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| CN115074098A (en) * | 2022-07-26 | 2022-09-20 | 西南石油大学 | Preparation and application of double-crosslinking nano reinforced foam gel water shutoff agent |
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| CN113088269A (en) * | 2019-12-23 | 2021-07-09 | 中石化南京化工研究院有限公司 | Organic-inorganic composite water shutoff agent |
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| CN103409120A (en) * | 2013-07-05 | 2013-11-27 | 中国石油天然气股份有限公司 | Polymer nano intercalation composite material plugging agent and preparation method and application thereof |
| CN108587585A (en) * | 2018-05-30 | 2018-09-28 | 中国石油大学(华东) | Profile-controlling and plugging agent and application, profile control and water plugging system and its preparation method and application |
| CN110903816A (en) * | 2019-12-17 | 2020-03-24 | 西南石油大学 | Temperature-resistant salt-resistant high-expansion plugging agent for plugging large cracks and preparation method thereof |
| CN113088269A (en) * | 2019-12-23 | 2021-07-09 | 中石化南京化工研究院有限公司 | Organic-inorganic composite water shutoff agent |
| CN113214809A (en) * | 2021-04-15 | 2021-08-06 | 长江大学 | Environment-friendly profile control and water shutoff system, preparation method thereof and application thereof in medium-low temperature high water-cut oil reservoir |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115074098A (en) * | 2022-07-26 | 2022-09-20 | 西南石油大学 | Preparation and application of double-crosslinking nano reinforced foam gel water shutoff agent |
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