CN114479803B - High-temperature profile control agent and preparation method and application thereof - Google Patents
High-temperature profile control agent and preparation method and application thereof Download PDFInfo
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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
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/592—Compositions used in combination with generated heat, e.g. by steam injection
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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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
- C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/887—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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
- C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/90—Compositions based on water or polar solvents containing organic compounds macromolecular compounds of natural origin, e.g. polysaccharides, cellulose
- C09K8/905—Biopolymers
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
- E21B43/168—Injecting a gaseous medium
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
- E21B43/243—Combustion in situ
Abstract
The invention provides a high-temperature profile control agent and a preparation method and application thereof. The raw materials for preparing the profile control agent comprise the following components in percentage by mass: 0.2 to 0.5 percent of temperature resistant material, 0.075 to 0.28 percent of cross-linking agent, 0.1 to 0.3 percent of suspending agent, 0.3 to 0.6 percent of activating agent, 0.01 to 0.04 percent of regulator, 0.08 to 0.15 percent of reinforcing agent, 0.012 to 0.026 percent of stabilizing agent and the balance of water; the temperature resistant material comprises a temperature resistant material A and a temperature resistant material B; the temperature resistant material A comprises at least one of hydroxypropyl methyl cellulose, hydroxybutyl methyl cellulose and hydroxyethyl methyl cellulose, and the temperature resistant material B comprises sodium polyacrylate; suspending agents include modified starches and/or xanthan gums. The profile control agent has good suspension dispersibility and good temperature resistance, can effectively block a stratum deep gas channeling passage after gas injection, and meets the high-temperature profile control requirement of a fire flooding oil reservoir fire flooding gas injection well after gas injection.
Description
Technical Field
The invention belongs to the technical field of oil extraction, and particularly relates to a gas injection profile control agent for a fireflooding gas injection well along with gas injection, and a preparation method and application thereof.
Background
Fireflood is one of the important core technologies for stable production and conversion development modes of Liaohe oil fields. At present, the number of the fire flooding well groups is 188 in blocks such as 66 blocks, 3618 blocks and 3 blocks, and the annual oil production is 47 ten thousand tons. Due to the heterogeneity of the reservoir, the problems of uneven air suction, air channeling and the like in the development of Liaohe fireflood are serious. The conventional fireflood gas injection well is limited by the conditions of low pressure of partial fireflood gas injection pipelines (less than 5 MPa) and difficult pipe column lifting, the profile control of the gas injection well is still in a study blank, no related study exists in the industry along with pneumatic profile control, and the demand is large, so that the production problems of uneven gas suction of the fireflood gas reservoir and inconsistent propelling speed of a fire wire need to be developed along with gas injection profile control agents.
Disclosure of Invention
The invention aims to provide a high-temperature profile control agent capable of being injected along with gas (namely, injected along with the gas) in a gas injection well of a fireflood, which has good suspension dispersibility and good temperature resistance, can effectively block a deep gas channeling passage of a stratum after the gas injection, and meets the high-temperature profile control requirement of a fireflood reservoir.
In order to achieve the above purpose, the invention provides a high-temperature profile control agent, wherein the raw materials for preparing the high-temperature profile control agent comprise the following components in percentage by mass:
0.2 to 0.5 percent of temperature resistant material, 0.075 to 0.28 percent of cross-linking agent, 0.1 to 0.3 percent of suspending agent, 0.3 to 0.6 percent of activating agent, 0.01 to 0.04 percent of regulator, 0.08 to 0.15 percent of reinforcing agent, 0.012 to 0.026 percent of stabilizing agent and the balance of water;
wherein the temperature resistant material comprises a temperature resistant material A and a temperature resistant material B; the temperature resistant material A comprises one or a combination of more than two of hydroxypropyl methyl cellulose, hydroxybutyl methyl cellulose and hydroxyethyl methyl cellulose, and the temperature resistant material B comprises sodium polyacrylate; wherein, the mass ratio of the temperature resistant material A is 0.1 to 0.3 percent and the mass ratio of the temperature resistant material B is 0.1 to 0.2 percent based on 100 percent of the total mass of the raw materials for preparing the high-temperature profile control agent;
the suspending agent comprises one or a combination of more than two of modified starch and xanthan gum.
The invention provides a high-temperature profile control agent, which is used for injecting gas along with gas into a fireflooding gas injection well.
In the high-temperature profile control agent, preferably, the crosslinking agent is a composite crosslinking agent comprising a crosslinking agent A and a crosslinking agent B; the mass ratio of the cross-linking agent A is 0.06-0.25% and the mass ratio of the cross-linking agent B is 0.015-0.03% based on 100% of the total mass of the raw materials for preparing the high-temperature profile control agent; namely: the high-temperature profile control agent is prepared from the following raw materials in percentage by mass:
0.2 to 0.5 percent of temperature resistant material, 0.06 to 0.25 percent of cross-linking agent A, 0.015 to 0.03 percent of cross-linking agent B, 0.1 to 0.3 percent of suspending agent, 0.3 to 0.6 percent of activating agent, 0.01 to 0.04 percent of regulator, 0.08 to 0.15 percent of reinforcing agent, 0.012 to 0.026 percent of stabilizing agent and the balance of water;
wherein the cross-linking agent A comprises one or more than two of paraformaldehyde and urotropine; the crosslinking agent B comprises one or more of resorcinol, hydroquinone, phenol and catechol.
In the high-temperature profile control agent, preferably, the raw materials for preparing the high-temperature profile control agent comprise the following components in percentage by mass:
0.15 to 0.25 percent of temperature resistant material A, 0.1 to 0.15 percent of temperature resistant material B, 0.07 to 0.2 percent of cross-linking agent A, 0.018 to 0.02 percent of cross-linking agent B, 0.15 to 0.25 percent of suspending agent, 0.4 to 0.5 percent of activating agent, 0.02 to 0.03 percent of regulator, 0.1 to 0.12 percent of reinforcing agent, 0.015 to 0.02 percent of stabilizing agent and the balance of water.
In the above high temperature profile control agent, preferably, the activator includes one or a combination of two or more of coconut diethanolamide, sodium heavy alkylbenzenesulfonate, and silicone polyether emulsion.
In the above high temperature profile control agent, preferably, the regulator includes one or a combination of two or more of sodium sulfite, oxalic acid and acetic acid.
In the above high temperature profile control agent, preferably, the enhancer comprises alfalfa meal and/or corncob meal.
In the above high temperature profile control agent, preferably, the stabilizer comprises dithiocyano methane.
In the above high temperature profile control agent, preferably, the modified starch includes one or a combination of two or more of modified corn starch, hydroxypropyl starch, and hydroxypropyl distarch phosphate.
In the high-temperature profile control agent, preferably, the water is oilfield reinjection sewage.
The invention also provides a preparation method of the high-temperature profile control agent, which comprises the following steps:
mixing the temperature-resistant material, the suspending agent and water to obtain a mixed solution;
and mixing the mixed solution with the cross-linking agent, the activating agent, the regulator, the reinforcing agent and the stabilizing agent to obtain the high-temperature profile control agent.
In the above preparation method, preferably, the mixing of the temperature resistant material, the suspending agent and water to obtain the mixed solution is achieved by the following means: and sequentially adding the temperature-resistant material and the suspending agent into the water, and stirring at normal temperature to obtain the mixed solution. In one embodiment, the agitation time is 10-20 minutes.
In the above preparation method, preferably, the high temperature profile control agent is obtained by mixing the mixed solution with the crosslinking agent, the activator, the regulator, the reinforcing agent and the stabilizer by: and adding the cross-linking agent, the activating agent, the regulator, the reinforcing agent and the stabilizing agent into the mixed solution in sequence, and stirring at normal temperature to obtain the high-temperature profile control agent. In one embodiment, the stirring is for 10-20 minutes.
The invention also provides application of the high-temperature profile control agent in deep profile control of the profile control agent injected into a fireflood oil reservoir with gas at the temperature of more than 200 ℃.
The high-temperature profile control agent provided by the invention has the advantages of easily available raw materials, simple preparation method, good temperature resistance, stable performance and long effective period, and can meet the requirement of deep profile control of a fireflood reservoir along with injection of fireflood injection gas.
Detailed Description
The technical solution of the present invention will be described in detail below for a clearer understanding of technical features, objects and advantageous effects of the present invention, but should not be construed as limiting the scope of the present invention.
Example 1
The embodiment provides a high-temperature profile control agent, which is prepared from the following raw materials in percentage by mass:
hydroxypropyl methylcellulose: 0.15%;
sodium polyacrylate: 0.1%;
paraformaldehyde: 0.07%;
hydroquinone: 0.018%;
modified starch (hydroxypropyl starch, manufacturer is biosciences limited, su-pi): 0.15%;
coconut diethanolamide: 0.4%;
sodium sulfite: 0.02%;
alfalfa powder: 0.1%;
dithiocyano methane: 0.015%;
the balance is oilfield reinjection sewage.
The preparation process comprises the following steps:
(1) Sequentially adding hydroxypropyl methyl cellulose, sodium polyacrylate and modified starch components into a liquid preparation tank containing a proper amount of reinjection sewage, and stirring for 10 minutes at normal temperature;
(2) And then continuously and sequentially adding paraformaldehyde, hydroquinone, coco diethanolamide, sodium sulfite, alfalfa powder and dithiocyano methane into the liquid preparation tank, and stirring for 15 minutes at normal temperature to obtain the high-temperature profile control agent.
Performance test 1
The high temperature profile control agents provided in example 1 were tested for gel time, gel strength and thermal stability, respectively.
(1) Gel forming time and gel forming strength of high-temperature profile control agent
The high temperature profile control agent provided in example 1 was tested for gel time and gel strength at various temperatures and the results are shown in table 1.
TABLE 1
| Temperature/. Degree.C | 90 | 120 | 160 | 200 |
| Gel time/h | 96 | 85 | 78 | 72 |
| Gluing/×10 4 mPa.s | 3.5 | 3.1 | 2.5 | 2.1 |
As can be seen from Table 1, when the temperature is increased from 90 ℃ to 200 ℃, the gel forming time of the high-temperature profile control agent is reduced from 96 hours to 72 hours, and both 96 hours and 72 hours can meet the deep profile control requirement. At the same time, the adhesiveness is increased from 3.5X10 as the temperature increases 4 mPas drop to 2.1X10 4 mPa.s, gel strength gradually decreases, but no matter 3.5X10 4 mPas is also 2.1X10 4 The mPa.s can meet the high-temperature profile control performance requirement. In a word, the influence of temperature on the high-temperature profile control agent is not great, and the high-temperature profile control agent meets the profile control requirement under the condition of a fire reservoir.
(2) Evaluation of thermal stability of high-temperature profile control agent
The high temperature profile control agent provided in example 1 was tested for thermal stability by the following specific method: the high temperature profile control agent provided in example 1 was incubated in a 200 ℃ oven for a long period of time and the gel strength was tested periodically. The viscosity of the gel after aging for 14 days is 20200mPa.s, the viscosity of the gel after aging for 30 days can be kept above 18600mPa.s, the viscosity of the gel after aging for 60 days is about 17700mPa.s, the viscosity of the gel after aging for 120 days is about 15600 mPa.s, the viscosity of the gel after aging for 180 days is about 14300 mPa.s, the viscosity of the gel after aging for 240 days is about 13900 mPa.s, and the viscosity of the gel after aging for 366 days is about 13000 mPa.s.
(3) Comparative analysis experiment
Under the premise of not changing other components of the high-temperature profile control agent provided in the example 1, 0.1% sodium polyacrylate is changed into 0.1% hydroxypropyl methylcellulose at different temperatures, and simultaneously, the dithiocyano methane component is removed to obtain a high-temperature profile control agent II, and the gel forming time and the gel forming strength of the high-temperature profile control agent II are tested, and the results are shown in Table 2.
TABLE 2
| Temperature/. Degree.C | 90 | 120 | 160 | 200 |
| Gel time/h | 94 | 86 | 75 | 70 |
| Gluing/×10 4 mPa.s | 3.36 | 3.05 | 1.7 | 1.1 |
As can be seen from Table 2, the experimental results of Table 1 are compared, the influence of changing the components of the agent on the gelling time of the high-temperature profile control agent II is small, and the gelling influence is small under the condition of below 120 ℃. After the temperature exceeds 120 ℃, the adhesiveness of the high-temperature profile control agent II is obviously reduced, which indicates that the high-temperature profile control agent II can not meet the profile control requirement under the condition of a fire-flooding reservoir.
Meanwhile, the high-temperature profile control agent II is tested, the temperature is kept for a long time in a 200 ℃ oven, and the gel strength is tested regularly. The viscosity of the gel after aging for 14 days is 10100 mPas, the viscosity of the gel after 30 days can still be maintained above 7350 mPas, the viscosity of the gel after 60 days is about 3620 mPas, the viscosity of the gel after 120 days is about 598 mPas, and experimental results show that the gel viscosity of the high-temperature profile control agent II gradually weakens with the prolongation of time under the condition of constant temperature of 200 ℃, basically fails after 120 days and has poor thermal stability.
Example 2
The embodiment provides a high-temperature profile control agent, which is prepared from the following raw materials in percentage by mass:
hydroxyethyl methylcellulose: 0.25%;
sodium polyacrylate: 0.15%;
urotropin: 0.2%;
phenol: 0.02%;
xanthan gum: 0.25%;
silicone polyether emulsion (polyether content 40%, solid content 70%, model: FM-70, manufacturer: shandong Lingyi city Lv Sen chemical Co., ltd.): 0.5%;
acetic acid: 0.03%;
corncob powder: 0.12%;
dithiocyano methane: 0.02%;
the balance is oilfield reinjection sewage.
The preparation process comprises the following steps:
(1) Sequentially adding hydroxyethyl methylcellulose, sodium polyacrylate and xanthan gum into a liquid preparation tank containing a proper amount of reinjection sewage, and stirring for 15 minutes at normal temperature;
(2) And then continuously and sequentially adding urotropine, phenol, silicone polyether emulsion, acetic acid, corncob powder and dithiocyano-methane into the liquid preparation tank, and stirring for 20 minutes at normal temperature to obtain the high-temperature profile control agent.
Performance test 2
The high temperature profile control agents provided in example 2 were tested for gel time, gel strength and thermal stability, respectively.
(1) Gel forming time and gel forming strength of high-temperature profile control agent
The high temperature profile control agent provided in example 2 was tested for gel time and gel strength at various temperatures and the results are shown in table 3.
TABLE 3 Table 3
| Temperature/. Degree.C | 90 | 120 | 160 | 200 |
| Gel time/h | 122 | 110 | 96 | 88 |
| Gluing/×10 4 mPa.s | 5.2 | 4.4 | 3.8 | 3.3 |
As can be seen from Table 3, when the temperature was increased from 90℃to 200 ℃CWhen the high-temperature profile control agent is used, the gel forming time is reduced from 122 to 88h, and the deep profile control requirements can be met by both 122h and 88 h. At the same time, the adhesiveness is increased from 5.2X10 as the temperature increases 4 mPas drop to 3.3X10 4 mPa.s, gel strength gradually decreases but is no matter 5.2X10 4 mPas is also 3.3X10 4 The mPa.s can meet the high-temperature profile control performance requirement. In a word, the influence of temperature on the high-temperature profile control agent is not great, and the high-temperature profile control agent meets the profile control requirement under the condition of a fire reservoir.
(2) Evaluation of thermal stability of high-temperature profile control agent
The high temperature profile control agent provided in example 2 was tested for thermal stability by the following specific method: the high temperature profile control agent provided in example 2 was incubated in a 200 ℃ oven for a long period of time and the gel strength was tested periodically. The gel viscosity after aging for 14 days is 30500mPa.s, the gel viscosity after aging for 30 days can still be kept above 27800mPa.s, the gel viscosity after aging for 60 days is about 25500mPa.s, the gel viscosity after aging for 120 days is about 22700 mPa.s, the gel viscosity after aging for 180 days is about 19600 mPa.s, the gel viscosity after aging for 240 days is about 18500 mPa.s, and the gel viscosity after aging for 366 days is about 17600 mPa.s, and the experimental result shows that the gel viscosity has a general tendency of gradually weakening with the prolongation of time under the condition of constant temperature of 200 ℃, but the viscosity reduction amplitude gradually decreases and tends to be stable, and the gel has strong plugging capability.
(3) Comparative analysis experiment
Under the premise of not changing other components of the high-temperature profile control agent provided in the example 2, 0.25% of hydroxyethyl methylcellulose is changed into 0.25% of carboxymethyl cellulose, meanwhile, the silicone polyether emulsion component is removed to obtain a high-temperature profile control agent III, and the gel forming time and the gel forming strength of the high-temperature profile control agent III are tested, and the results are shown in Table 4.
TABLE 4 Table 4
| Temperature/. Degree.C | 90 | 120 | 160 | 200 |
| Gel time/h | 118 | 112 | 93 | 90 |
| Gluing/×10 4 mPa.s | 4.8 | 4.1 | 2.6 | 1.5 |
As can be seen from Table 4, comparing the experimental results of Table 3, the change of the components of the agent has less influence on the gelling time of the high temperature profile control agent III, and the gelling effect is not great at the temperature below 120 ℃. After the temperature exceeds 120 ℃, the adhesiveness of the high-temperature profile control agent II is obviously reduced, which indicates that the high-temperature profile control agent III can not meet the profile control requirement under the condition of a fire-flooding reservoir.
Meanwhile, the high-temperature profile control agent III is tested, the temperature is kept for a long time in a 200 ℃ oven, and the gel strength is tested regularly. The gel viscosity after aging for 14 days is 13200mPa.s, the gel viscosity after 30 days can still be kept above 8560mPa.s, the gel viscosity after 60 days is about 4110mPa.s, the gel viscosity after 120 days is about 785 mPa.s, and experimental results show that the gel viscosity of the high-temperature profile control agent III gradually weakens with the prolongation of time under the condition of constant temperature of 200 ℃, and the gel basically fails after 120 days and has poor thermal stability.
Example 3
The embodiment provides an example of the application of the high-temperature profile control agent prepared in the embodiment 2 in profile control of injection wells of fireflood heavy oil reservoirs.
Taking 91 Liaohe oilfield brocade injection well brocade W2 wells as an example, the well has uneven air suction and serious air channeling phenomenon, high permeability channels exist in the stratum, and the application effect of the corresponding well group is deteriorated year by year. In order to effectively control adverse effects of gas channeling, the high-temperature profile control agent prepared in the embodiment 2 is used for implementing deep profile control measures on the well, so that the production effect of the well group is improved, and the utilization degree is improved.
The concrete construction process comprises the following steps: treatment radius design 22m, profile control dosage 6530m 3 The discharge capacity is 6-10m 3 And/h. The method comprises the following specific steps: the wellhead oil pipe is used as a tee joint, an air injection pipeline is connected, a hard pipeline with a one-way valve is connected with an injection pump, and the injection pump is used for injecting the high-temperature profile control agent prepared in the embodiment 2 while injecting air, and the high-temperature profile control agent and the air are mixed in the oil pipe and then enter the stratum.
The initial injection construction pressure is 6.2MPa, and the construction pressure is slowly increased in the whole process. After the measures, the gas injection pressure of the well rises by 3.1MPa, 2 effective directions are newly added to the production well group, the average water content of the well group is reduced to 78.6 percent from 93.6 percent, the average daily oil production of the well group rises to 14.5t from 10.2t, the accumulated oil increase 1052 is realized, and the oil increase effect is obvious;
the profile control construction method is realized by gas injection, and as can be seen from the embodiment 3, the construction process has the advantages that the construction pressure is slowly increased in the injection process, the construction is not easy to smoothly carry out due to the fact that the construction pressure is not instantaneously increased to be very high, the good pumping performance is realized, and the safe and smooth construction progress is ensured.
Claims (6)
1. The high-temperature profile control agent comprises the following raw materials in percentage by mass:
0.2 to 0.5 percent of temperature resistant material, 0.075 to 0.28 percent of cross-linking agent, 0.1 to 0.3 percent of suspending agent, 0.3 to 0.6 percent of activating agent, 0.01 to 0.04 percent of regulator, 0.08 to 0.15 percent of reinforcing agent, 0.012 to 0.026 percent of stabilizing agent and the balance of water;
wherein the temperature resistant material comprises a temperature resistant material A and a temperature resistant material B; the temperature resistant material A comprises one or a combination of more than two of hydroxypropyl methyl cellulose, hydroxybutyl methyl cellulose and hydroxyethyl methyl cellulose, and the temperature resistant material B comprises sodium polyacrylate; wherein, the mass ratio of the temperature resistant material A is 0.1 to 0.3 percent and the mass ratio of the temperature resistant material B is 0.1 to 0.2 percent based on 100 percent of the total mass of the raw materials for preparing the high-temperature profile control agent;
the suspending agent comprises one or two of modified starch and xanthan gum;
the cross-linking agent is a composite cross-linking agent and comprises a cross-linking agent A and a cross-linking agent B; the mass ratio of the cross-linking agent A is 0.06-0.25% and the mass ratio of the cross-linking agent B is 0.015-0.03% based on 100% of the total mass of the raw materials for preparing the high-temperature profile control agent; wherein the cross-linking agent A comprises one or two of paraformaldehyde and urotropine; the cross-linking agent B comprises one or more of resorcinol, hydroquinone, phenol and catechol;
wherein the activator comprises one or more than two of coconut diethanolamide, sodium heavy alkylbenzenesulfonate and silicone polyether emulsion;
wherein the stabilizer comprises dithiocyano methane;
wherein the regulator comprises one or more than two of sodium sulfite, oxalic acid and acetic acid;
wherein the enhancer comprises alfalfa meal and/or corncob meal.
2. The high temperature profile control agent of claim 1, wherein the raw materials for preparing the high temperature profile control agent comprise, in mass percent:
0.15 to 0.25 percent of temperature resistant material A, 0.1 to 0.15 percent of temperature resistant material B, 0.07 to 0.2 percent of cross-linking agent A, 0.018 to 0.02 percent of cross-linking agent B, 0.15 to 0.25 percent of suspending agent, 0.4 to 0.5 percent of activating agent, 0.02 to 0.03 percent of regulator, 0.1 to 0.12 percent of reinforcing agent, 0.015 to 0.02 percent of stabilizing agent and the balance of water.
3. The high temperature profile control agent of claim 1 or 2, wherein the modified starch comprises one or a combination of two or more of modified corn starch, hydroxypropyl distarch phosphate.
4. The high temperature profile control agent of claim 1 or 2, wherein the water is oilfield reinjection sewage.
5. A method of preparing the high temperature profile control agent of claim 1 or 2, the method comprising:
mixing the temperature-resistant material, the suspending agent and water to obtain a mixed solution;
and mixing the mixed solution with the cross-linking agent, the activating agent, the regulator, the reinforcing agent and the stabilizing agent to obtain the high-temperature profile control agent.
6. The use of the high temperature profile control agent of any one of claims 1-4 in profile control of a gas injection profile control agent deep seal for a fireflood reservoir at a temperature above 200 ℃.
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