CN115785929A - Preparation and application of high-temperature-resistant and hypersalinity-resistant double-crosslinked gel system - Google Patents
Preparation and application of high-temperature-resistant and hypersalinity-resistant double-crosslinked gel system Download PDFInfo
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- 238000006297 dehydration reaction Methods 0.000 claims abstract description 20
- 239000002086 nanomaterial Substances 0.000 claims abstract description 18
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- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 19
- 125000002485 formyl group Chemical class [H]C(*)=O 0.000 claims description 19
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical group [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims description 8
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- IRLPACMLTUPBCL-KQYNXXCUSA-N 5'-adenylyl sulfate Chemical compound C1=NC=2C(N)=NC=NC=2N1[C@@H]1O[C@H](COP(O)(=O)OS(O)(=O)=O)[C@@H](O)[C@H]1O IRLPACMLTUPBCL-KQYNXXCUSA-N 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
- KWLMIXQRALPRBC-UHFFFAOYSA-L hectorite Chemical compound [Li+].[OH-].[OH-].[Na+].[Mg+2].O1[Si]2([O-])O[Si]1([O-])O[Si]([O-])(O1)O[Si]1([O-])O2 KWLMIXQRALPRBC-UHFFFAOYSA-L 0.000 claims description 5
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Abstract
The invention provides a preparation method and application of a high-temperature-resistant and hypersalinity-resistant double-crosslinked gel system, and relates to the field of oilfield chemistry. The high-temperature-resistant and hypersalinity-resistant double-crosslinked gel system is mainly prepared from the following components in percentage by mass: 1 to 3 percent of solid phase/nano material, 0.2 to 1.0 percent of polymer, 0.2 to 0.6 percent of first cross-linking agent, 0.2 to 0.6 percent of second cross-linking agent, 0.1 to 0.3 percent of retarder and the balance of water. The gel system is prepared from the raw materials, and the preparation process is simple. The system aims at developing the cross-linking/interpenetrating density of the system to the maximum extent, introduces the nano material, arranges the nano material in an aggregated manner in a three-dimensional network structure of the polymer, and constructs the multi-entanglement nano reinforced coagulantThe gel formed by the gel network has good temperature resistance and salt tolerance, and the temperature is 170 ℃ and the temperature is 20 multiplied by 10 4 The dehydration amount under mg/L is low, and the gel forming time can be adjusted after the retarder is added, so that the method has good economic and popularization and application values.
Description
Technical Field
The invention relates to the technical field of oilfield chemistry, in particular to preparation and application of a high-temperature-resistant and hypersalinity-resistant double-crosslinked gel system.
Background
The high-temperature and high-salinity oil-gas reservoir is a main place for increasing storage and production of oil and natural gas in the 21 st century, and plays an important role in the oil industry of China. Reservoir conditions such as Tarim oil fields, qinghai oil fields, xinjiang oil fields and the like are harsh, the exploitation difficulty is high, and high-temperature and high-salinity conditions limit more production increasing measures.
With the exploration and development of oil and gas resources, the oil field exploration and development target aims at a high-temperature and high-salinity oil and gas reservoir, but the problem of water production of the oil and gas reservoir inevitably occurs in the development process, and in order to solve the problem of water production in the development process, a high-temperature-resistant and high-salinity-resistant water plugging system needs to be developed. Aiming at high-temperature and high-salinity oil and gas reservoirs, the conventional water plugging system mainly comprises a polymer gel system, a resin system, a foam gel system and the like, the polymer gel system is most widely applied, and the resin system has good temperature resistance and salt tolerance, but is high in cost, difficult to post-treat and not suitable for large-scale application; the foamed gel system is easily affected by temperature and mineralization degree, and has poor long-term stability.
The polymer gel is formed by a three-dimensional network structure formed by a polymer and a cross-linking agent through chemical bonds or intermolecular force. Under the conditions of high temperature and high mineralization, the conventional polymer gel has relatively poor stability and high gelling speed, and can not meet the field requirements. In order to meet the requirements of temperature resistance and salt tolerance, a ternary copolymer (AM/AMPS/NVP) with temperature resistance and salt tolerance is introduced, an AMPS monomer is introduced into the copolymer, and the monomer enables polymer molecules to have bulky side groups, can form larger steric hindrance and has-SO 3- The group can have a certain salt resistance effect, the NVP monomer can increase the thermal stability of the polymer, mainly because a rigid group with stronger thermal stability exists in the NVP structure, and the NVP structure can form larger steric hindrance, inhibit the hydrolysis of the amide group, and form a temperature-resistant salt-resistant gel system with the crosslinking agent.
In conclusion, the polymer gel has wide application prospect, and is limited in application due to poor temperature resistance and salt tolerance as a water blocking system, so that a high-temperature-resistant and high-salinity-resistant gel system is urgently needed to be developed.
Disclosure of Invention
The invention aims to provide a mineral processing method suitable for the temperature of 170 ℃ and the mineralization degree of 20 multiplied by 10 4 mg/L, controllable gelling time, high temperature resistance and hypersalinity resistance.
The invention also aims to provide a preparation method of the high-temperature-resistant and hypersalinity-resistant double-crosslinked gel system, and aims to prepare the polymer gel system.
In order to achieve the purpose, the invention adopts the following technical scheme:
the high-temperature-resistant and hypersalinity-resistant double-crosslinking gel system comprises the following components: solid phase/nano material, polymer, first cross-linking agent, second cross-linking agent, retarder and the balance of water.
The invention provides a high-temperature-resistant and hypersalinity-resistant double-crosslinked gel system which mainly comprises the following components in percentage by mass: 1 to 5 percent of solid phase/nano material, 0.2 to 1.5 percent of polymer, 0.2 to 1.0 percent of first cross-linking agent, 0.2 to 1.0 percent of second cross-linking agent, 0.1 to 0.4 percent of retarder and the balance of water.
The nano material is nano silicon dioxide (SiO) 2 ) Montmorillonite (LSM), hectorite (RDS); the polymer is a terpolymer (obtained by copolymerizing AM/AMPS/NVP monomers); the cross-linking agent is the combination of aldehyde cross-linking agent and phenol cross-linking agent; the retarder is sodium sulfite.
The invention also provides a preparation method of the high-temperature-resistant and hypersalinity-resistant double-crosslinked gel system, which mainly comprises the following steps:
s1: adding a retarder with a certain mass percentage into 80m1 of water, adding a solid phase/nano material after stirring and fully dissolving, setting the rotating speed to be 400-500r/min, and stirring for 20 minutes;
s2: after step 1 is sufficiently stirred uniformly, the polymer is added, and it should be noted that the polymer must be slowly added along the vortex wall of the stirring, and cannot be directly poured in. In the process, the stirring is required to be carried out for more than 2 hours, the higher the polymer concentration is, the longer the stirring time is;
s3: adding a first cross-linking agent into 10ml of water, fully and uniformly stirring by using a glass rod, then adding the mixture into the solution stirred in the step (2), and continuously stirring for 10 minutes;
s4: and (3) adding a second cross-linking agent into 10ml of water, fully and uniformly stirring by using a glass rod, then adding the mixture into the solution stirred in the step (3), and continuously stirring for 10 minutes to obtain a sample mother solution.
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 high-temperature-resistant and hypersalinity-resistant double-crosslinking gel system provided by the invention has the effective benefits that: the system aims at developing the crosslinking/interpenetrating density of the system to the maximum extent, the multipolymer and the crosslinking agent form a double-crosslinking polymer gel network structure, the nano material is introduced and arranged in a polymer three-dimensional network structure in an aggregation manner to construct a multi-entanglement nano reinforced gel network, the formed gel has good temperature resistance and salt tolerance, the retarder is introduced, the gelling time of the system is controllable, the defects of poor stability and high gelling rate of most polymer crosslinked gel at 170 ℃ are overcome, and the system has the application potential of high-ultrahigh temperature reservoir.
The invention provides a preparation method of a high-temperature-resistant and hypersalinity-resistant double-crosslinked gel system, which has the following effective benefits: the method of 'one-pot' is basically adopted, is simple and easy to operate, and is suitable for field application.
Drawings
For clearly explaining technical solutions of the embodiments of the present invention, the drawings needed 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 those skilled in the art can also obtain other related drawings according to the drawings without creative efforts.
FIG. 1 is a graph of the dehydration rate of a gel system aged 30 days at different polymer concentrations for example 1 of the present invention.
FIG. 2 is a graph showing the dehydration rate of gel system aged for 30d at different concentrations of aldehyde-based crosslinking agent in example 2 of the present invention.
FIG. 3 is a graph showing the dehydration rate of the gel system aged 30d at different concentrations of phenolic crosslinker in example 3 of the present invention.
FIG. 4 is a dehydration rate curve of gel system aged for 30d under different solid phase/nano material in example 4 of the present invention.
FIG. 5 is a graph of the dehydration rate of gel system aged 30d at different nanosilica concentrations for example 5 of the present invention.
FIG. 6 is a graph of the dehydration rate of example 6 of the present invention after aging of the gel system for 30 days at different retarder concentrations.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples do not show the specific conditions, and the general conditions or the conditions recommended by the manufacturer are followed. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The preparation and application of the high temperature resistant and hypersalinity resistant double-crosslinked gel system provided by the embodiment of the invention are specifically described below.
The preparation and the application of a high-temperature-resistant and hypersalinity-resistant double-crosslinked gel system are mainly prepared from the following components in percentage by mass: 1 to 5 percent of solid phase/nano material, 0.2 to 1.5 percent of polymer, 0.2 to 1.0 percent of first cross-linking agent, 0.2 to 1.0 percent of second cross-linking agent, 0.1 to 0.4 percent of retarder and the balance of water.
Further preferably, the preparation and application of the high-temperature-resistant and hypersalinity-resistant double-crosslinking gel system are mainly prepared from the following components in percentage by mass: 1 to 3 percent of solid phase/nano material, 0.2 to 1.0 percent of polymer, 0.2 to 0.6 percent of first cross-linking agent, 0.2 to 0.6 percent of second cross-linking agent, 0.1 to 0.3 percent of retarder and the balance of water.
The nano material is nano silicon dioxide (SiO) 2 ) Montmorillonite (LSM), hectorite (RDS); the polymer is a terpolymer (obtained by copolymerizing AM/AMPS/NVP monomers); the cross-linking agent is the combination of aldehyde cross-linking agent and phenol cross-linking agent; the retarder is sodium sulfite.
The invention also provides a preparation method of the high-temperature-resistant and hypersalinity-resistant double-crosslinked gel system, which mainly comprises the following steps:
s1: adding a retarder with a certain mass percentage into 80m1 of water, adding a solid phase/nano material after stirring and fully dissolving, setting the rotating speed to be 400-500r/min, and stirring for 20 minutes;
s2: after step 1 is sufficiently stirred uniformly, the polymer is added, and it should be noted that the polymer must be slowly added along the vortex wall of the stirring, and cannot be directly poured in. In the process, the stirring is required to be carried out for more than 2 hours, the higher the polymer concentration is, the longer the stirring time is;
s3: adding a first cross-linking agent into 10ml of water, fully and uniformly stirring by using a glass rod, then adding the mixture into the solution stirred in the step (2), and continuously stirring for 10 minutes;
s4: and (3) adding a second cross-linking agent into 10ml of water, fully and uniformly stirring by using a glass rod, then adding the mixture into the solution stirred in the step (3), and continuously stirring for 10 minutes to obtain a sample mother solution.
In the present invention, the Gel strength determination method is based on the Gel strength Gel Srength Codes of Sdansk et al (1988), abbreviated as CSC visual code table, shown 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 embodiment provides a high-temperature-resistant and hypersalinity-resistant double-crosslinked gel system, and the preparation method is implemented according to the steps S1, S2, S3 and S4, specifically by mass percent: 1% of nano silicon dioxide, 0.2-1.5% of polymer, 0.5% of aldehyde crosslinking agent and 0.5% of phenol crosslinking agent. It is to be noted that the aldehyde crosslinking agent and the phenol crosslinking agent were diluted with 10m1 aqueous solution, respectively. The total volume of the system was 100m1.
Example 2
The embodiment provides a high-temperature-resistant and hypersalinity-resistant double-crosslinked gel system, and the preparation method is implemented according to the steps S1, S2, S3 and S4, specifically by mass percent: 1% of nano silicon dioxide, 1.0% of polymer, 0.2-1.0% of aldehyde crosslinking agent and 0.5% of phenol crosslinking agent. It is to be noted that the aldehyde crosslinking agent and the phenol crosslinking agent were diluted with 10m1 aqueous solution, respectively. The total volume of the system was 100m1.
Example 3
The embodiment provides a high-temperature-resistant and hypersalinity-resistant double-crosslinked gel system, and the preparation method is implemented according to the steps S1, S2, S3 and S4, specifically by mass percent: 1% of nano silicon dioxide, 1.0% of polymer, 0.6% of aldehyde crosslinking agent and 0.2-1.0% of phenol crosslinking agent. It is to be noted that the aldehyde crosslinking agent and the phenol crosslinking agent were diluted with 10m1 aqueous solution, respectively. The total volume of the system was 100m1.
Example 4
The embodiment provides a high-temperature-resistant and hypersalinity-resistant double-crosslinked gel system, and the preparation method is implemented according to the steps S1, S2, S3 and S4, specifically by mass percent: 1% of nano silicon dioxide/montmorillonite/hectorite, 1.0% of polymer, 0.6% of aldehyde crosslinking agent and 0.4% of phenol crosslinking agent. It is to be noted that the aldehyde crosslinking agent and the phenol crosslinking agent were diluted with 10m1 aqueous solution, respectively. The total volume of the system was 100m1.
Example 5
The embodiment provides a high-temperature-resistant and hypersalinity-resistant double-crosslinked gel system, and the preparation method is implemented according to the steps S1, S2, S3 and S4, specifically according to the mass percentage: 1-5% of nano silicon dioxide, 1.0% of polymer, 0.6% of aldehyde crosslinking agent and 0.4% of phenol crosslinking agent. It is to be noted that the aldehyde crosslinking agent and the phenol crosslinking agent were diluted with 10m1 aqueous solution, respectively. The total volume of the system was 100m1.
Example 6
The embodiment provides a high-temperature-resistant and hypersalinity-resistant double-crosslinked gel system, and the preparation method is implemented according to the steps S1, S2, S3 and S4, specifically by mass percent: 0.1-0.4% of sodium sulfite, 1% of nano silicon dioxide, 1.0% of polymer, 0.6% of aldehyde crosslinking agent and 0.4% of phenol crosslinking agent. It is to be noted that the aldehyde crosslinking agent and the phenol crosslinking agent were diluted with 10m1 aqueous solution, respectively. The total volume of the system was 100m1. The blank was compared without retarder.
Experimental example 1
The polymer gel prepared in example 1 was tested for a dehydration rate curve after aging at 170 ℃ for 30d, and the results are shown in FIG. 1.
The curve of the dewatering rate is shown in FIG. 1
As can be seen from FIG. 1, the gels prepared from the polymers of example 1 at different concentrations, the 0.2 and 0.4% polymer systems were completely hydrolyzed after aging at 170 ℃ for 30 days, and the dehydration amounts of the 0.6%, 0.8%, 1.0%, 1.2% and 1.5% polymer systems after aging at 170 ℃ for 30 days were 76.8ml, 68.0ml, 2.0ml, 10ml and 8.0ml, respectively. The polymer concentration of 1.0% minimizes the amount of dehydration of the system.
Experimental example 2
The polymer gel prepared in example 2 was tested for a dehydration rate curve after aging at 170 ℃ for 30d, and the results are shown in FIG. 2.
The curve of the dewatering rate is shown in FIG. 2
As can be seen from FIG. 2, in the gels prepared by using the aldehyde crosslinking agents with different concentrations in example 2, the system with the aldehyde crosslinking agent concentration of 0.2-1.0% is dehydrated into 7.8ml, 6.6ml, 3.0ml, 6.2ml and 6.0ml after being aged for 30 days at 170 ℃. The aldehyde crosslinking agent concentration of 0.6% can minimize the dehydration of the system.
Experimental example 3
The polymer gel prepared in example 3 was tested for a dehydration rate curve after aging at 170 ℃ for 30d, and the results are shown in FIG. 3.
The curve of the dewatering rate is shown in FIG. 3
As can be seen from FIG. 3, the gels prepared from the phenolic crosslinking agent of example 3 with different concentrations were dehydrated by 2.0ml, 1.4ml, 1.7ml, 2.7ml and 2.3ml after aging the system with the phenolic crosslinking agent concentration of 0.2-1.0% for 30 days at 170 ℃. The phenolic crosslinker concentration of 0.4% minimizes system dehydration.
Experimental example 4
The polymer gel prepared in example 4 was tested for a dehydration rate curve aged at 170 ℃ for 30d, and the results are shown in FIG. 4.
The curve of the dewatering rate is shown in FIG. 4
As can be seen from FIG. 4, the gel prepared from different solid phase/nanomaterial in example 4 is dehydrated into 2.4ml, 8.2ml and 12.0ml after the nano-silica, hectorite and montmorillonite systems are aged for 30 days at 170 ℃. The nanosilica system has the least amount of dehydration.
Experimental example 5
The polymer gel prepared in example 5 was tested for a dehydration rate curve after aging at 170 ℃ for 30d, and the results are shown in FIG. 5.
The curve of the dewatering rate is shown in FIG. 5
As can be seen from FIG. 5, in the gels prepared by using nanosilica with different concentrations in example 5, the system with nanosilica concentration of 1.0-5.0% was dehydrated by 1.5ml, 1.4ml, 1.3ml, 1.4ml and 1.2ml respectively after being aged for 30 days at 170 ℃.
Experimental example 6
The polymer gel prepared in example 6 was tested for gelling and dehydration after aging at 170 ℃ for 30d, and the results are shown in Table 2 and FIG. 6.
The gelling condition is shown in Table 2
As can be seen from Table 2, the polymer gel gels at 170 deg.C, and the gel time gradually increases with increasing retarder concentration.
The curve of the dewatering rate is shown in FIG. 6
As can be seen from FIG. 6, the gels prepared from the retarders of example 6 with different concentrations, the system with retarder concentration of 0-0.4% was dehydrated by 1.8ml, 2.2ml, 3.6ml and 4.4ml after aging at 170 ℃ for 30 days.
The invention aims to develop the crosslinking/interpenetrating density of the system to the maximum extent, the multipolymer and the crosslinking agent form a double-crosslinking polymer gel network structure, the nanometer material is introduced and is arranged in a polymer three-dimensional network structure in an aggregation way to construct a multi-entanglement nanometer reinforced gel network, the formed gel has good temperature resistance and salt tolerance, the defect of poor stability of most polymer crosslinked gel at 170 ℃ is overcome, and the high-ultrahigh temperature reservoir application potential is realized.
The invention provides a high temperature resistant and hypersalinity resistant double-cross-linked gel system, which is at 170 ℃ and 20 multiplied by 10 4 The stability under mg/L is good, and the dehydration amount is low; and the gel forming time can be adjusted after the retarder is added, so that the method has good economic and popularization and application values.
The invention also provides a preparation method of the high-temperature-resistant and hypersalinity-resistant double-crosslinked gel system, which has the following effective benefits: the method of 'one-pot' is basically adopted, is simple and easy to operate, and is suitable for field application.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The preparation method and the application of the high-temperature-resistant and hypersalinity-resistant double-crosslinked gel system are characterized in that the gel system is mainly prepared from the following components in percentage by mass: 1 to 5 percent of solid phase/nano material, 0.2 to 1.5 percent of polymer, 0.2 to 1.0 percent of first cross-linking agent, 0.2 to 1.0 percent of second cross-linking agent, 0.1 to 0.4 percent of retarder and the balance of water;
further preferably, the preparation and application of the high-temperature-resistant and hypersalinity-resistant double-crosslinking gel system are mainly prepared from the following components in percentage by mass: 1 to 3 percent of solid phase/nano material, 0.2 to 1.0 percent of polymer, 0.2 to 0.6 percent of first cross-linking agent, 0.2 to 0.6 percent of second cross-linking agent, 0.1 to 0.3 percent of retarder and the balance of water.
2. The high temperature and hypersalinity resistant dual-crosslinked gel system according to claim 1, wherein said nanomaterial is nanosilica (SiO) 2 ) Montmorillonite (LSM), hectorite (RDS);
the polymer is a terpolymer (obtained by copolymerizing AM/AMPS/NVP monomers);
the cross-linking agent is the combination of aldehyde cross-linking agent and phenol cross-linking agent;
the retarder is sodium sulfite.
3. The high temperature and high salinity resistant double-crosslinked gel system according to claims 1-2, wherein the gel system is at 170 ℃、20×10 4 Good stability under mg/L and low dehydration amount.
4. The high temperature and hypersalinity resistant dual cross-linked gel system according to claims 1-2, wherein the gel system is at 170 ℃ 20 x 10 4 Can be gelled under the condition of mg/L, and the gelling time can be adjusted after the retarder is added.
5. The high temperature and high salinity resistant double-crosslinked gel system according to claims 1-2, characterized in that the system aims at developing the crosslinking/interpenetrating density of the system to the maximum extent, the multipolymer and the crosslinking agent form a double-crosslinked polymer gel network structure, the nano-materials are introduced and arranged in the polymer three-dimensional network structure in an aggregating way, a multi-entangled nano reinforced gel network is constructed, the formed gel has good temperature and salt tolerance, the defects of poor stability and uncontrollable gel formation of most polymer crosslinked gels at 170 ℃ are overcome, and the high-ultrahigh temperature reservoir application potential is provided.
6. The method for preparing the high temperature and hypersalinity resistant double cross-linked gel system according to claims 1-2, characterized in that a one-pot method is basically adopted, the preparation is simple, and the system is suitable for on-site preparation.
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| JP2008280406A (en) * | 2007-05-09 | 2008-11-20 | Keio Gijuku | Interpenetrating polymer network gel and production method thereof |
| CN112442347A (en) * | 2019-09-04 | 2021-03-05 | 北京海力森能源科技有限公司 | Salt-resistant and high-temperature-resistant gel plugging agent crosslinked by adopting bisphenol propane and formaldehyde |
| CN112920785A (en) * | 2021-02-24 | 2021-06-08 | 西南石油大学 | Imidazole-enhanced superhigh temperature resistant liquid rubber plug and improved gelling test method thereof |
| CN112980412A (en) * | 2019-12-17 | 2021-06-18 | 中国石油化工股份有限公司 | Modifying and flooding agent suitable for high-temperature high-salinity heavy oil reservoir and preparation method thereof |
| CN113861954A (en) * | 2021-10-21 | 2021-12-31 | 西南石油大学 | Ultra-low initial viscosity polymer gel profile control system and preparation method thereof |
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| CN112442347A (en) * | 2019-09-04 | 2021-03-05 | 北京海力森能源科技有限公司 | Salt-resistant and high-temperature-resistant gel plugging agent crosslinked by adopting bisphenol propane and formaldehyde |
| CN112980412A (en) * | 2019-12-17 | 2021-06-18 | 中国石油化工股份有限公司 | Modifying and flooding agent suitable for high-temperature high-salinity heavy oil reservoir and preparation method thereof |
| CN112920785A (en) * | 2021-02-24 | 2021-06-08 | 西南石油大学 | Imidazole-enhanced superhigh temperature resistant liquid rubber plug and improved gelling test method thereof |
| CN113861954A (en) * | 2021-10-21 | 2021-12-31 | 西南石油大学 | Ultra-low initial viscosity polymer gel profile control system and preparation method thereof |
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