CN108728067B - Composition with selective water plugging function and preparation method and application thereof - Google Patents
Composition with selective water plugging function and preparation method and application thereof Download PDFInfo
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- CN108728067B CN108728067B CN201710256384.7A CN201710256384A CN108728067B CN 108728067 B CN108728067 B CN 108728067B CN 201710256384 A CN201710256384 A CN 201710256384A CN 108728067 B CN108728067 B CN 108728067B
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—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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- 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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- 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
- C09K8/516—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls characterised by their form or by the form of their components, e.g. encapsulated material
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Abstract
The invention relates to the field of water plugging materials, and discloses a composition with a selective water plugging function, a preparation method thereof, a composition prepared by the method and application thereof. Specifically, the composition contains an oil-soluble resin, a main emulsifier and a co-emulsifier, wherein the oil-soluble resin is selected from one or more of rosin resin, dammar resin, oil-soluble phenolic resin, petroleum resin and terpene resin; the main emulsifier is selected from a compound shown in a formula (I) and/or a compound shown in a formula (II); the weight ratio of the oil-soluble resin to the main emulsifier to the auxiliary emulsifier is 1: 0.2-2.5: 0.05-5. The composition with the selective water plugging function provided by the invention has good effects of plugging water and not plugging oil, and has temperature resistance, salt resistance and scouring resistance. R1O‑SO3‑M1(formula I) R2‑SO3‑M2(formula II).
Description
Technical Field
The invention relates to the field of water plugging materials, in particular to a composition with a selective water plugging function and a preparation method thereof, and the composition prepared by the method and application thereof.
Background
The polymer water shutoff material is a water shutoff agent which is applied in large scale at present and is mainly divided into a polymer phase permeation regulator and a polymer gel water shutoff agent. The main difference between the two is that the phase permeation regulator is mainly long-chain polymer molecules, and the polymer molecular chains stretch in the water phase and shrink in the oil phase to form a dragging effect on the water phase and reduce the water phase permeability, and the system cannot cause physical blocking of the pore volume, but the water blocking strength is not enough and the scouring resistance is poor. The polymer gel water shutoff agent enables the oil-water phase permeability to be reduced unevenly by means of the change of the effective movable volume under the action of oil and water, but the oil-water channel physical shutoff can be caused by the treatment mode, so that the seepage capability of a porous medium is reduced, the oil production capability is also reduced while the water production of an oil well is greatly reduced, the liquid production amount is too low due to improper treatment, and the yield of crude oil is reduced. Therefore, the system is mostly used for treating the water absorption profile of the water injection well with serious heterogeneous condition, and when the system is used for plugging water in a production well, a more complex auxiliary method such as a temporary plugging method, an annular space extreme pressure method, an over-displacement method and the like is needed. Although the polymer water plugging material has a good practical effect, a corresponding injection process must be formulated according to the actual conditions of each oil field in the using process, otherwise, the injection of the water plugging agent cannot achieve the water plugging effect, the water yield is increased, and the crude oil yield is reduced.
Although the existing oil-based and water-based water plugging systems have certain selectivity, the water plugging and oil plugging systems can block water and oil, and indoor physical and model experiments show that the oil plugging rate of the existing plugging agent is more than 35%, the temperature resistance and salt resistance of the systems are poor, and the popularization and application range is small. The research of the solution type selective plugging agent is the development direction of the polymer material technology, and the material microstructure recognition and synthesis modification technology based on the molecular level is the key of the research of the selective plugging agent; the interaction mechanism of the plugging agent and the rock is researched under the real oil reservoir condition, the essence of the plugging agent is deduced from the molecular level, and the method is the basis of the research and evaluation of the selective plugging agent. However, the water plugging material has low flushing resistance and short service cycle. Therefore, aiming at harsh oil reservoir conditions, the improvement of the temperature resistance and salt tolerance of the water plugging material and the scouring resistance thereof have important significance.
At present, selective water shutoff agents and deep profile control technologies at home and abroad are improved day by day, and the selective water shutoff materials are developed greatly on the technologies of research development, construction process and the like, but along with the development of oil fields, the characteristics of oil layers and the environment are changed constantly, particularly, the water shutoff materials are adopted for a long time to make the contradiction of oil reservoir development more prominent in the later development period, the practical development experience of the oil fields is summarized according to the characteristics of the selective water shutoff materials, and the technical problem which must be overcome at present by the selective water shutoff agents is provided so as to develop new technologies in a targeted manner to adapt to the special oil fields and improve the water shutoff effect of a selective system.
In summary, most of the selective plugging agents used for water plugging of oil wells at present are gels or jelly generated by water-soluble polymers such as polyacrylamide and derivatives thereof in the stratum to plug the stratum water, or oil-based plugging agents are used for gelling or curing when meeting water to plug water channeling passages, but due to poor selectivity, the oil phase permeability can be greatly reduced while water plugging is carried out, so that low liquid after plugging is caused, and the application of the water plugging technology of the oil wells is restricted. Therefore, a novel high-selectivity water plugging material is developed, the water plugging and oil plugging of an oil layer are realized, and the method has important significance for improving the productivity of an oil well in an ultrahigh water cut period.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a composition with a selective water plugging function, a preparation method and application thereof. The composition with the selective water plugging function provided by the invention has good effects of plugging water and not plugging oil, has temperature resistance and salt resistance and scouring resistance, and can be well adapted to high-temperature and high-salt oil reservoir conditions.
The inventor of the invention discovers in research that a novel emulsion suspension type water plugging material can be obtained by using a specific oil-soluble resin, a main emulsifier and a co-emulsifier according to a specific proportion, the water plugging material has stronger affinity with oil reservoir stratum rocks, and after being injected into stratum oil reservoir pores at an oil production well through an injection pump, the water plugging material can generate powerful plugging on stratum pore canal water phase, and the scouring resistance is strong, so that the water phase permeability is greatly reduced; and when the water plugging material meets the oil phase of a stratum pore channel, the water plugging material can act with crude oil to automatically plug, so that the influence on the oil phase permeability is reduced, and the effect of plugging water and not plugging oil is achieved. In addition, the water plugging material has insensitivity to the salinity of formation water and a higher softening point (above 90 ℃), so that the temperature resistance and salt resistance of the water plugging material are enhanced, and the water plugging material is suitable for the conditions of high-temperature and high-salinity oil reservoirs.
Therefore, in order to achieve the above object, in a first aspect, the present invention provides a composition having a selective water shutoff function, the composition comprising an oil-soluble resin, a primary emulsifier and a secondary emulsifier, wherein the oil-soluble resin is selected from one or more of rosin resin, dammar resin, oil-soluble phenolic resin, petroleum resin and terpene resin; the main emulsifier is selected from a compound shown in a formula (I) and/or a compound shown in a formula (II),
R1O-SO3-M1(formula I) is shown in the specification,
R2-SO3-M2(formula II) in the formula (III),
wherein R is1Is C12-C18 alkyl, M1Is an alkali metal or alkaline earth metal, R2Is aralkyl or C12-C18 alkyl, M2Is an alkali metal or an alkaline earth metal;
the weight ratio of the oil-soluble resin to the main emulsifier to the auxiliary emulsifier is 1: 0.2-2.5: 0.05 to 5, preferably 1: 0.3-1.8: 0.05-4.5.
In a second aspect, the present invention also provides a preparation method of a composition with a selective water shutoff function, comprising the following steps:
(1) mixing a main emulsifier with water to form an aqueous solution;
(2) mixing a co-emulsifier with the aqueous solution to form an emulsion;
(3) mixing an oil-soluble resin with the emulsion;
wherein the oil-soluble resin is selected from one or more of rosin resin, dammar resin, oil-soluble phenolic resin, petroleum resin and terpene resin; the main emulsifier is selected from a compound shown in a formula (I) and/or a compound shown in a formula (II),
R1O-SO3-M1(formula I) is shown in the specification,
R2-SO3-M2(formula II) in the formula (III),
wherein R is1Is C12-C18 alkyl, M1Is an alkali metal or alkaline earth metal, R2Is aralkyl or C12-C18 alkyl, M2Is an alkali metal or an alkaline earth metal;
the weight ratio of the oil-soluble resin to the main emulsifier to the auxiliary emulsifier is 1: 0.2-2.5: 0.05 to 5, preferably 1: 0.3-1.8: 0.05-4.5.
In a third aspect, the invention also provides a composition with the selective water plugging function, which is prepared by the preparation method.
In a fourth aspect, the invention also provides the application of the composition in a water plugging material, in particular to the application in an oil field water plugging material.
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
In a first aspect, the invention provides a composition with a selective water plugging function, which comprises an oil-soluble resin, a main emulsifier and a co-emulsifier, wherein the oil-soluble resin is selected from one or more of rosin resin, dammar resin, oil-soluble phenolic resin, petroleum resin and terpene resin; the main emulsifier is selected from a compound shown in a formula (I) and/or a compound shown in a formula (II),
R1O-SO3-M1(formula I) is shown in the specification,
R2-SO3-M2(formula II) in the formula (III),
wherein R is1Is C12-C18 alkyl (or straight chain alkyl), M1Is an alkali metal or alkaline earth metal, R2Is aralkyl or C12-C18 alkyl (or linear alkyl), M2Is an alkali metal or an alkaline earth metal; the weight ratio of the oil-soluble resin to the main emulsifier to the auxiliary emulsifier is 1: 0.2-2.5: 0.05 to 5, preferably 1: 0.3-1.8: 0.05-4.5.
In the composition of the present invention, the source of the oil-soluble resin is not particularly limited in the present invention, and for example, it can be obtained by a conventional commercially available means. In a preferable case, the particle size of the oil-soluble resin is 3 to 100 μm, preferably 3 to 50 μm, for the purpose of more preferably achieving selective water shutoff.
Preferably, in the primary emulsifier, R1Is C12-C14 alkyl, M1Is an alkali metal, R2Is aralkyl or C12-C14 alkyl, M2Is an alkali metal. Preferably, the primary emulsifier is selected from one or more of sodium dodecyl sulfate, sodium dodecyl sulfate and sodium dodecyl benzene sulfonate.
In the composition of the present invention, the kind of the co-emulsifier is not particularly limited, for example, the co-emulsifier may be selected from one or more of span 20, span 40, span 60, span 80, tween 20, tween 40, tween 60 and tween 80.
In the composition of the present invention, the components of the composition may be stored in a mixed state before use or may be stored independently of each other. Preferably, each component of the composition is stored separately prior to use.
According to the composition of the present invention, the composition may further contain water. In particular, the composition may be mixed with water at the time of use. In a preferred case, the water content is 5 to 1000mL, preferably 10 to 200mL, per gram of oil-soluble resin.
In a second aspect, the present invention also provides a method for preparing a composition with selective water shutoff function, comprising: mixing oil-soluble resin, main emulsifier and auxiliary emulsifier with water.
In the present invention, a material having a selective water shutoff function can be obtained by mixing the above-mentioned components, however, mixing the components in a certain order can further improve the water shutoff performance thereof, and therefore, in a preferred embodiment of the present invention, the present invention also provides a method for preparing a composition having a selective water shutoff function, the method comprising the steps of:
(1) mixing a main emulsifier with water to form an aqueous solution;
(2) mixing a co-emulsifier with the aqueous solution to form an emulsion;
(3) mixing an oil-soluble resin with the emulsion;
wherein the oil-soluble resin is selected from one or more of rosin resin, dammar resin, oil-soluble phenolic resin, petroleum resin and terpene resin; the main emulsifier is selected from a compound shown in a formula (I) and/or a compound shown in a formula (II),
R1O-SO3-M1(formula I) is shown in the specification,
R2-SO3-M2(formula II) in the formula (III),
wherein R is1Is C12-C18 alkyl, M1Is an alkali metal or alkaline earth metal, R2Is aralkyl or C12-C18 alkyl, M2Is an alkali metal or an alkaline earth metal; the weight ratio of the oil-soluble resin to the main emulsifier to the auxiliary emulsifier is 1: 0.2-2.5: 0.05 to 5, preferably 1: 0.3-1.8: 0.05-4.5. In the invention, the weight of each raw material is calculated according to the charging ratio.
In the production method of the present invention, the source of the oil-soluble resin is not particularly limited, and for example, it can be obtained by a conventional commercially available means. In a preferable case, the particle size of the oil-soluble resin is 3 to 100 μm, preferably 3 to 50 μm, for the purpose of more preferably achieving selective water shutoff.
Preferably, in the primary emulsifier, R1Is C12-C14 alkyl, M1Is an alkali metal, R2Is aralkyl or C12-C14 alkyl, M2Is an alkali metal. Preferably, the primary emulsifier is selected from one or more of sodium dodecyl sulfate, sodium dodecyl sulfate and sodium dodecyl benzene sulfonate.
In the preparation method of the present invention, the kind of the co-emulsifier is not particularly limited, and for example, the co-emulsifier may be selected from one or more of span 20, span 40, span 60, span 80, tween 20, tween 40, tween 60 and tween 80.
In the preparation method of the present invention, the components in the composition may be stored in a mixed state before use or may be stored independently of each other. Preferably, each component of the composition is stored separately prior to use.
According to the preparation method of the present invention, the amount of the water used in the present invention is not particularly limited as long as a stable emulsion-suspended water shutoff material can be finally formed. For example, the amount of water is 5 to 1000mL, preferably 10 to 200mL, per gram of the oil-soluble resin.
According to the preparation method of the present invention, in the step (1), the mixing manner is not particularly limited in the present invention as long as the components in the system can be uniformly mixed, and for example, the mixing can be performed under stirring. In a preferred aspect, the mixing conditions include: the mixing temperature is 20-50 ℃, the mixing time is 0.5-3h, and the stirring speed is 500-700 r/min.
According to the preparation method of the present invention, in the step (2), the mixing manner is not particularly limited in the present invention as long as the components in the system can be uniformly mixed, and for example, the mixing can be performed under stirring. In a preferred aspect, the mixing conditions include: the mixing temperature is 20-50 ℃, the mixing time is 1-2h, and the stirring speed is 500-700 r/min.
According to the preparation method of the present invention, in the step (3), the mixing manner is not particularly limited in the present invention as long as the components in the system can be uniformly mixed, and for example, the mixing can be performed under stirring. In a preferred aspect, the mixing conditions include: the mixing temperature is 20-50 ℃, the mixing time is 0.5-3h, and the stirring speed is 500-700 r/min.
In a third aspect, the invention also provides a composition (material) with a selective water plugging function, which is prepared by the preparation method.
In a fourth aspect, the invention also provides the application of the composition in a water plugging material, in particular to the application in an oil field water plugging material.
In the present invention, the environmental conditions of the oil field may include: the temperature is 40-130 ℃, preferably 70-110 ℃, and more preferably 90-110 ℃; the degree of mineralization is 100-200,000mg/L, preferably 10,000-100,000mg/L, more preferably 50,000-100,000 mg/L.
The present invention will be described in detail below by way of examples.
Unless otherwise specified, the reagents used in the following examples and comparative examples are commercially available.
In the following examples and comparative examples,
the oil-soluble phenolic resin is purchased from Jining HuaKai resin Co., Ltd, and has the brand number of 2402;
the petroleum resin is purchased from Jitian chemical industry Co., Ltd, Shenzhen, and the brand is C5C 9;
the rosin resin is purchased from Shanghai Sanlian industries Co Ltd, and the brand is TF-100.
In the following examples and comparative examples, the test methods involved are as follows:
the plugging rate is carried out on a rock core flow test device according to the plugging rate test procedure in SY/T5840-2007 bridge plugging material indoor test method for drilling fluid. Specifically, the method comprises the following steps:
and (3) measuring the water plugging rate: loading the artificial core into core holder, saturating with water, and measuring water phase permeability (K)w1) Then 10mL of water plugging agent is extruded, and after curing for 24h at 90 ℃, the permeability (K) of the mixture after adding the water plugging agent is measured by waterw2)，Kw2And Kw1Ratio (K)w2/Kw1) Namely the water plugging rate.
And (3) measuring the oil plugging rate: loading the artificial core into core holder, saturating with oil, and measuring oil phase permeability (K)o1) Then 10mL of water shutoff agent is extruded, and after curing for 24h at 90 ℃, the permeability (K) of the water shutoff agent added is measured by oilo2)，Ko2And Ko1Of (K)o2/Ko1) Namely the oil plugging rate.
And (3) measuring the scouring resistance multiple: after the water plugging rate is measured, water with 50 times of pore volume multiple (PV) is continuously injected into the rock core, the permeability under different PV numbers is recorded, the water plugging rate under different PV numbers is calculated according to the measuring method of the water plugging rate, and the scouring resistance multiple is the maximum PV number of the injected water when the water plugging rate is more than or equal to 80%. Normally, the water blocking rate at 50PV number is measured, and the value is more than or equal to 80 percent, which indicates that the material has excellent flushing resistance.
Wherein the artificial core is obtained by filling quartz sand of 40-60 meshes in a mould.
Example 1
This example illustrates the composition with selective water shutoff function provided by the present invention.
1. Weighing 1g of sodium dodecyl benzene sulfonate, adding into 100mL of water, and fully stirring (600r/min) at 30 ℃ for 0.5h to form a stable aqueous solution;
2. weighing 2.5g of span 20, adding into the aqueous solution, fully stirring (600r/min) for 1h at 30 ℃, and uniformly mixing to form stable emulsion;
3. 0.6g of oil-soluble phenolic resin (with the particle size of 3-50 mu m) is weighed and added into the emulsion, and after the mixture is fully stirred (600r/min) for 0.5h at the temperature of 30 ℃, the stable emulsion suspension-shaped water plugging material A1 is formed.
Tests show that under the conditions of high temperature (90 ℃) and high salt (the mineralization is 50,000mg/L), the water blocking rate of the water blocking material A1 is 96.42%, the oil blocking rate is 16.81%, and the scouring resistance multiple is more than 50 PV. This shows that the water plugging material prepared in this example has excellent selective plugging rate and flushing resistance to oil/water, and particularly still has good selective plugging rate to oil/water under high temperature and high salt conditions.
Example 2
This example illustrates the composition with selective water shutoff function provided by the present invention.
1. Weighing 5g of sodium dodecyl sulfate, adding the sodium dodecyl sulfate into 100mL of water, and fully stirring (600r/min) for 2h at 50 ℃ to form a stable aqueous solution;
2. weighing 0.6g of Tween 60, adding into the above aqueous solution, stirring at 50 deg.C for 2 hr (600r/min), and mixing to obtain stable emulsion;
3. 10g of petroleum resin (with the particle size of 3-50 mu m) is weighed and added into the emulsion, and after the mixture is fully stirred (600r/min) for 2h at the temperature of 50 ℃, the stable emulsion suspension-shaped water plugging material A2 is formed.
Tests show that under the conditions of high temperature (90 ℃) and high salt (the mineralization degree is 80,000mg/L), the water blocking rate of the water blocking material A2 is 99.33%, the oil blocking rate is 18.24%, and the scouring resistance multiple is more than 50 PV. This shows that the water plugging material prepared in this example has excellent selective plugging rate and flushing resistance to oil/water, and particularly still has good selective plugging rate to oil/water under high temperature and high salt conditions.
Example 3
This example illustrates the composition with selective water shutoff function provided by the present invention.
1. Weighing 2g of sodium dodecyl sulfate, adding the sodium dodecyl sulfate into 100mL of water, and fully stirring (600r/min) for 3h at the temperature of 30 ℃ to form a stable aqueous solution;
2. weighing 2g of span 80, adding the span 80 into the aqueous solution, fully stirring the mixture (600r/min) for 1.5h at the temperature of 40 ℃, and uniformly mixing the mixture to form stable emulsion;
3. 2g of rosin resin (with the particle size of 3-50 mu m) is weighed and added into the emulsion, and after the mixture is fully stirred (600r/min) for 1.5h at the temperature of 50 ℃, the stable emulsion suspension-shaped water plugging material A3 is formed.
Tests show that under the conditions of high temperature (90 ℃) and high salt (the mineralization degree is 100,000mg/L), the water blocking rate of the water blocking material A3 is 97.45%, the oil blocking rate is 16.35%, and the scouring resistance multiple is more than 50 PV. This shows that the water plugging material prepared in this example has excellent selective plugging rate and flushing resistance to oil/water, and particularly still has good selective plugging rate to oil/water under high temperature and high salt conditions.
Example 4
This example illustrates the composition with selective water shutoff function provided by the present invention.
1. Weighing 1.5g of sodium dodecyl benzene sulfonate, adding into 100mL of water, and fully stirring (600r/min) at 20 ℃ for 1.5h to form a stable aqueous solution;
2. weighing 1g of Tween 20, adding into the above aqueous solution, stirring at 20 deg.C (600r/min) for 1.5h, and mixing to obtain stable emulsion;
3. 5g of oil-soluble phenolic resin (with the particle size of 3-50 mu m) is weighed and added into the emulsion, and after the mixture is fully stirred (600r/min) for 1h at the temperature of 20 ℃, the stable emulsion suspension-shaped water plugging material A4 is formed.
Tests show that under the conditions of high temperature (90 ℃) and high salt (the mineralization is 80,000mg/L), the water blocking rate of the water blocking material A4 is 99.8%, the oil blocking rate is 18.56%, and the scouring resistance multiple is more than 50 PV. This shows that the water plugging material prepared in this example has excellent selective plugging rate and flushing resistance to oil/water, and particularly still has good selective plugging rate to oil/water under high temperature and high salt conditions.
Example 5
This example illustrates the composition with selective water shutoff function provided by the present invention.
The procedure was carried out in accordance with example 3 except that, in step (1), sodium laurylsulfate was added in an amount of 5g to obtain a water-plugging material A5.
Tests show that under the conditions of high temperature (90 ℃) and high salt (the mineralization degree is 100,000mg/L), the water blocking rate of the water blocking material A5 is 89.52%, the oil blocking rate is 17.24%, and the scouring resistance multiple is more than 50 PV. This shows that the water plugging material prepared in this example has better selective plugging rate and flushing resistance to oil/water.
Example 6
This example illustrates the composition with selective water shutoff function provided by the present invention.
The procedure was carried out as in example 3, except that, in step (1), 0.4g of sodium lauryl sulfate was added to obtain a water-plugging material A6.
Tests show that under the conditions of high temperature (90 ℃) and high salt (the mineralization degree is 100,000mg/L), the water blocking rate of the water blocking material A6 is 90.23%, the oil blocking rate is 19.14%, and the scouring resistance multiple is more than 50 PV. This shows that the water plugging material prepared in this example has better selective plugging rate and flushing resistance to oil/water.
Example 7
This example illustrates the composition with selective water shutoff function provided by the present invention.
1g of sodium dodecyl benzene sulfonate, 2.5g of span 20 and 0.6g of oil-soluble phenolic resin (with the particle size of 3-50 mu m) are weighed and added into 100mL of water, and after the mixture is fully stirred (600r/min) for 2 hours at the temperature of 30 ℃, the stable emulsion suspension-shaped water plugging material A7 is formed.
Tests show that under the conditions of high temperature (90 ℃) and high salt (the mineralization is 50,000mg/L), the water blocking rate of the water blocking material A7 is 85.98%, the oil blocking rate is 19.71%, and the scouring resistance multiple is 50 PV. This shows that the water plugging material prepared in this example has better selective plugging rate and flushing resistance to oil/water.
Comparative example 1
The procedure of example 3 was followed, except that sodium laurylsulfate was not added, to obtain a water-plugging material D1.
Tests show that under the conditions of high temperature (90 ℃) and high salt (the mineralization is 100,000mg/L), the water plugging rate of the water plugging material D1 is 70.23%, the oil plugging rate is 35.25%, and the scouring resistance multiple is less than 50 PV.
Comparative example 2
The procedure of example 3 was followed, except that in the step (3), 2g of coumarone resin (available from Shandong Xiang Sho New Material Co., Ltd., brand No. 18) was used in place of the rosin resin, to obtain water-blocking material D2.
Tests show that under the conditions of high temperature (90 ℃) and high salt (the mineralization is 100,000mg/L), the water blocking rate of the water blocking material D2 is 80.21%, the oil blocking rate is 25.95%, and the scouring resistance multiple is less than 50 PV.
Comparative example 3
The procedure was carried out as in example 3, except that in step (1), 2g of nonylphenol polyoxyethylene ether was used in place of sodium lauryl sulfate, to obtain a water-plugging material D3.
Tests show that under the conditions of high temperature (90 ℃) and high salt (the mineralization is 100,000mg/L), the water blocking rate of the water blocking material D3 is 88.26%, the oil blocking rate is 32.52%, and the scouring resistance multiple is less than 50 PV.
Comparative example 4
The procedure of example 3 was followed, except that span 80 was not added, to obtain water-blocking material D4.
Tests show that under the conditions of high temperature (90 ℃) and high salt (the mineralization degree is 100,000mg/L), the water blocking rate of the water blocking material D4 is 85.62%, the oil blocking rate is 18.28%, and the scouring resistance multiple is less than 50 PV.
Comparing the results of the above examples 1-7 with the results of the comparative examples 1-4, it can be seen that the composition with selective water shutoff function provided by the invention has good effects of water shutoff and oil non-shutoff, and has temperature resistance, salt resistance and flushing resistance, and can be well adapted to high-temperature and high-salt reservoir conditions. In particular, as can be seen by comparing example 3 with comparative examples 2 to 3, the invention selects specific types of oil-soluble resin and main emulsifier, and can further improve the water-blocking and oil-blocking effects of the water-blocking material.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (15)
1. The composition with the selective water plugging function is characterized by comprising an oil-soluble resin, a main emulsifier and a co-emulsifier, wherein the oil-soluble resin is selected from one or more of rosin resin, dammar resin, oil-soluble phenolic resin, petroleum resin and terpene resin; the main emulsifier is selected from one or more of sodium dodecyl sulfate, sodium dodecyl sulfate and sodium dodecyl benzene sulfonate;
the coemulsifier is selected from one or more of span 20, span 40, span 60, span 80, tween 20, tween 40, tween 60 and tween 80;
the weight ratio of the oil-soluble resin to the main emulsifier to the auxiliary emulsifier is 1: 0.3-1.8: 0.05-4.5;
the particle size of the oil-soluble resin is 3-50 μm.
2. The composition of claim 1, wherein the composition further comprises water.
3. The composition according to claim 2, wherein the water is present in an amount of 5-1000mL per gram of oil-soluble resin.
4. The composition according to claim 2, wherein the water content is 10-200mL per gram of oil-soluble resin.
5. The preparation method of the composition with the selective water shutoff function is characterized by comprising the following steps:
(1) mixing a main emulsifier with water to form an aqueous solution;
(2) mixing a co-emulsifier with the aqueous solution to form an emulsion;
(3) mixing an oil-soluble resin with the emulsion;
wherein the oil-soluble resin is selected from one or more of rosin resin, dammar resin, oil-soluble phenolic resin, petroleum resin and terpene resin; the main emulsifier is selected from one or more of sodium dodecyl sulfate, sodium dodecyl sulfate and sodium dodecyl benzene sulfonate;
the auxiliary emulsifier is selected from one or more of span 20, span 40, span 60, span 80, tween 20, tween 40, tween 60 and tween 80;
the weight ratio of the oil-soluble resin to the main emulsifier to the auxiliary emulsifier is 1: 0.3-1.8: 0.05-4.5;
the particle size of the oil-soluble resin is 10-50 μm.
6. The production method according to claim 5, wherein the amount of water used is 5 to 1000mL per gram of the oil-soluble resin.
7. The production method according to claim 5, wherein the amount of water used is 10 to 200mL per gram of the oil-soluble resin.
8. The production method according to claim 5, wherein, in the step (1), the mixing is performed in a stirring manner, and the conditions of the mixing include: the mixing temperature is 20-50 ℃, the mixing time is 0.5-3h, and the stirring speed is 500-700 r/min.
9. The production method according to claim 5, wherein, in the step (2), the mixing is performed in a stirring manner, and the conditions of the mixing include: the mixing temperature is 20-50 ℃, the mixing time is 1-2h, and the stirring speed is 500-700 r/min.
10. The production method according to claim 5, wherein, in the step (3), the mixing is performed in a stirring manner, and the conditions of the mixing include: the mixing temperature is 20-50 ℃, the mixing time is 0.5-3h, and the stirring speed is 500-700 r/min.
11. The composition with selective water plugging function prepared by the preparation method of any one of claims 5 to 10.
12. Use of a composition according to any one of claims 1 to 4 and 11 in a water plugging material, in particular in an oil field water plugging material.
13. The use of claim 12, wherein the environmental conditions of the oilfield comprise: the temperature is 40-130 ℃; the degree of mineralization is 100-200,000 mg/L.
14. The use of claim 13, wherein the environmental conditions of the oilfield comprise: the temperature is 70-110 ℃; the degree of mineralization was 10,000-100,000 mg/L.
15. The use of claim 14, wherein the environmental conditions of the oilfield comprise: the temperature is 90-110 ℃; the degree of mineralization was 50,000-100,000 mg/L.
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| CN116064022B (en) * | 2021-11-01 | 2024-06-04 | 中国石油化工股份有限公司 | Oil field profile control water shutoff composition and preparation method and application thereof |
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