CN117210211A - Profile control system for medium-high permeability high-temperature oil reservoir and application thereof - Google Patents
Profile control system for medium-high permeability high-temperature oil reservoir and application thereof Download PDFInfo
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- 230000035699 permeability Effects 0.000 title claims abstract description 62
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 64
- 229920000642 polymer Polymers 0.000 claims abstract description 57
- 239000002245 particle Substances 0.000 claims abstract description 41
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 38
- 238000010521 absorption reaction Methods 0.000 claims abstract description 11
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 5
- 125000002485 formyl group Chemical class [H]C(*)=O 0.000 claims description 7
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 3
- 230000007062 hydrolysis Effects 0.000 claims description 3
- 238000006460 hydrolysis reaction Methods 0.000 claims description 3
- 239000000178 monomer Substances 0.000 claims description 3
- 238000006116 polymerization reaction Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 12
- 238000000034 method Methods 0.000 abstract description 9
- 238000006073 displacement reaction Methods 0.000 abstract description 7
- 239000003795 chemical substances by application Substances 0.000 abstract description 6
- 238000009991 scouring Methods 0.000 abstract description 4
- 239000003208 petroleum Substances 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 54
- 230000000052 comparative effect Effects 0.000 description 29
- 238000002347 injection Methods 0.000 description 15
- 239000007924 injection Substances 0.000 description 15
- 239000000126 substance Substances 0.000 description 9
- 229920006037 cross link polymer Polymers 0.000 description 6
- 230000007774 longterm Effects 0.000 description 6
- 238000002156 mixing Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000004132 cross linking Methods 0.000 description 5
- 239000010779 crude oil Substances 0.000 description 5
- 239000012530 fluid Substances 0.000 description 5
- 239000003292 glue Substances 0.000 description 5
- 239000010413 mother solution Substances 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 239000011435 rock Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 230000008961 swelling Effects 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000011010 flushing procedure Methods 0.000 description 3
- 239000012452 mother liquor Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005354 coacervation Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004513 sizing Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000001595 flow curve Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
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Abstract
The invention relates to a profile control system of a medium-high permeability high temperature oil reservoir and application thereof, belonging to the technical field of profile control agents for petroleum exploitation. The profile control system of the medium-high permeability high temperature oil reservoir mainly comprises the following components: the polymer, the viscoelastic particles, the cross-linking agent and water, wherein the mass ratio of the polymer, the viscoelastic particles and the cross-linking agent is (12-19): (3-8): (2-10); the polymer is partially hydrolyzed polyacrylamide. The profile control agent can form a compact three-dimensional net structure in the gelling process, so that the gelling strength of the profile control system is higher, the viscosity after gelling is higher, the profile control agent has better plugging effect and scouring resistance, the inversion of the water absorption profile of a high-permeability layer and a low-permeability layer can be realized, an oil displacement system can enter the low-permeability layer with relatively plugged resources more easily, and the effective utilization of residual resources of the low-permeability layer is realized.
Description
Technical Field
The invention relates to a profile control system of a medium-high permeability high temperature oil reservoir and application thereof, belonging to the technical field of profile control agents for petroleum exploitation.
Background
The oil field is developed by long-term water injection, and due to the heterogeneity, the oil-water viscosity difference and the unbalance of an oil-water well group in the longitudinal direction and the plane of an oil reservoir, injected water and chemical driving agent solution flow along a high-permeability area with smaller resistance in the water driving or chemical driving process, bypass a low-permeability high-resistance area, and easily form an area where injected fluid cannot pass through and even form a dead oil area, so that the oil field has the advantages of low crude oil extraction degree of a middle-low permeable layer, poor oil driving effect, serious influence on the development benefits of water driving and chemical driving, excessive and premature water production of the oil field, and influence on stable and high yield of the oil field. In addition, in the long-term water injection development process, high-consumption water strips are easy to form due to long-term scouring of injection fluid, so that the injection fluid can permeate along the high-consumption water strips to the production of an oil well, the water injection efficiency of an oil field is reduced, the crude oil production cost is increased, and the water injection development effect and the economic benefit are not ideal.
The water shutoff and profile control technology is always an effective means for improving the water flooding and chemical flooding development effects of the oil field and realizing the stable production of the oil reservoir. The cross-linked polymer gel is used as a profile control agent widely applied to various oil fields, and the profile control liquid has good pumpability before being injected into a destination, has fluidity under certain pressure and can enter the deep part of an oil reservoir; after the bottom layer is glued, the profile control liquid can generate larger gel strength, has good viscosity, elasticity and flushing resistance, increases the resistance coefficient and residual resistance coefficient in the displacement process, improves the water absorption profile of the oil reservoir, and improves the water flooding or chemical flooding development effect.
However, the gel has certain fluidity after gel formation, and the profile control effect of the high-temperature oil reservoir with high medium-high permeability and large permeability level difference is difficult to achieve the ideal effect. Especially, the plugging profile control efficiency is relatively low for high-consumption water strips formed by long-term water flooding.
Disclosure of Invention
The invention aims to provide a profile control system of a medium-high permeability high-temperature oil reservoir, which solves the problem of non-uniformity in the longitudinal direction and the plane of a long-term water injection development oil field, and improves the sweep volume and displacement efficiency of injected fluid, thereby realizing the efficient exploitation of the oil reservoir.
The second purpose of the invention is to provide an application of a profile control system of a medium-high permeability high temperature oil reservoir, which solves the problem that the water absorption profile inversion of a high-low permeability layer is difficult to realize by the conventional crosslinked polymer gel.
In order to achieve the above purpose, the technical scheme of the profile control system of the medium-high permeability high temperature oil reservoir is as follows:
the profile control system of the medium-high permeability high temperature oil reservoir mainly comprises the following components: the polymer, the viscoelastic particles, the cross-linking agent and water, wherein the mass ratio of the polymer, the viscoelastic particles and the cross-linking agent is (12-19): (3-8): (2-10); the polymer is partially hydrolyzed polyacrylamide.
In the profile control system, the viscoelastic particles play a role of coacervation nuclei in the gelling process, so that the cross-linking reaction is started around the viscoelastic particles, and the gelling time of the profile control system is shortened; meanwhile, due to the effect of the viscoelastic particles serving as cores, the crosslinking reaction can be unfolded around the viscoelastic particles to form a more compact three-dimensional network structure taking the viscoelastic particles as cores, so that the gel forming strength of the profile control system is higher, the viscosity after gel forming is higher, and the profile control system has better blocking effect and scouring resistance.
In addition, the profile control system can realize the inversion of the water absorption profile of the high-permeability layer and the low-permeability layer, so that the oil displacement system is easier to enter the low-permeability layer with relatively blocked resources, the residual resources of the low-permeability layer are effectively utilized, and the profile control system has excellent auxiliary effect on further improving the crude oil recovery efficiency in the later period of an old oil field.
The profile control system is prepared by mixing a polymer, viscoelastic particles, a cross-linking agent and water, wherein the oxygen content in the system is maintained to be lower than 1mg/L in the mixing process.
In order to facilitate the plugging profile control into the deep formation, it is preferable that the viscoelastic particles have a median particle diameter of 315-470 μm after swelling.
In order to improve the profile control capability and the flushing resistance of the system, preferably, the viscoelastic particles are granular viscoelastic polymers prepared by taking acrylamide as a basic monomer through polymerization reaction. Further preferably, the viscoelastic particles are type I PPG and/or type II PPG.
Preferably, the degree of hydrolysis of the polymer is 17% to 29%. More preferably 20 to 21%.
Preferably, the number average molecular weight of the polymer is 1500 to 3500 ten thousand. More preferably 2600 to 2800 ten thousand.
In order to ensure the strength of the profile control system, the concentration of the polymer in the profile control system is preferably 1200-1900 mg/L.
Further preferably, the concentration of the polymer in the profile control system is 1500-1900 mg/L, the concentration of the viscoelastic particles is 370-800 mg/L, and the concentration of the crosslinking agent is 600-1000 mg/L. The profile control system composed of substances at the concentration not only ensures that the dosage of the substances is less and the glue forming speed is higher, but also ensures that the glue forming strength is higher along with the extension of the glue forming time after the glue forming.
Further preferably, the concentration of the polymer in the profile control system is 1600-1900 mg/L, the concentration of the viscoelastic particles is 475-800 mg/L, and the concentration of the crosslinking agent is 600-1000 mg/L.
In order to increase the rate of gelling, the crosslinking agent is preferably an organic aldehyde crosslinking agent.
The technical scheme of the application of the profile control system of the medium-high permeability and high temperature oil reservoir is as follows:
the profile control system of the medium-high permeability high temperature oil reservoir is applied to the aspect of realizing the inversion of the water absorption profile of a high-low permeability layer.
The profile control system can realize the inversion of the water absorption profile of the high-low permeability layer, has low viscosity after being prepared by a ground mixing system, has good fluidity, can be injected into a target stratum by a constant-speed pump under certain pressure, can perform a crosslinking reaction under the stratum temperature condition, generates a profile control system with high viscosity and high elasticity, effectively blocks the high-permeability layer and the high-consumption water strip, realizes the uniform propulsion of the subsequent injection fluid, and improves the exploitation efficiency of an oil field.
Preferably, the temperature of the profile control system for gel forming is 70-85 ℃. The gel is formed at the temperature, so that the profile control system is beneficial to plugging deeper stratum.
Drawings
FIG. 1 is a microscopic morphology graph of the profile control system of example 1 of the present invention after gelling;
FIG. 2 is a graph of microscopic morphology of the profile control system of comparative example 3 after gelling;
FIG. 3 is a graph of the split rate of the high and low permeability cores before and after profile control in example 1;
FIG. 4 is a graph of the split rate of the high and low permeability cores before and after profile control in comparative example 5;
fig. 5 is a profile pressure graph of the profile control system of example 1 and comparative example 5.
Detailed Description
The technical scheme of the invention is further described below with reference to the specific embodiments.
1. The specific embodiment of the profile control system of the medium-high permeability and high temperature oil reservoir is as follows:
the following examples all use this preparation method to prepare profile control systems using the following steps:
(1) Mixing polymer and viscoelastic particles according to the corresponding mass ratio of each embodiment, uniformly adding the mixture into stirring water, stirring and curing for 2-3 hours, and preparing polymer+viscoelastic particle mother solution with certain mass concentration;
(2) Respectively vacuumizing and deoxidizing the mother solution of the polymer and the viscoelasticity particles and the water for preparation, and controlling the oxygen content in the system to be lower than 1mg/L;
(3) Fully and uniformly mixing the deoxidized polymer and the viscoelasticity particle mother solution, water and the organic aldehyde crosslinking agent in a closed state, and controlling the concentration of each substance to be required by each embodiment by adjusting the addition amount of the polymer and the viscoelasticity particle mother solution, the water and the organic aldehyde crosslinking agent;
(4) And (3) placing the solution obtained in the step (3) in a closed container, and controlling the ambient temperature to be the corresponding temperature to enable the system to crosslink into the gel autonomously.
Wherein the mass ratio of the polymer and the viscoelastic particles of step (1) in examples 1-4, 10 is 3:1; the mass ratio of the polymer and viscoelastic particles of step (1) in examples 5-8 was 2:1; the mass ratio of the polymer from step (1) to the viscoelastic particles in examples 9-15 was 4:1.
The ambient temperature for step (3) in examples 1-12 was 70℃and the ambient temperature for step (3) in examples 13-15 was 85 ℃.
Example 1
The polymer in this example was a partially hydrolyzed polyacrylamide having a number average molecular weight of 2777 ten thousand and a degree of hydrolysis of 20.37%. The polymer water solution is prepared from partially hydrolyzed polyacrylamide and aged sewage.
The viscoelastic particles are particulate viscoelastic polymers prepared by polymerization using acrylamide as the base monomer, and the example is PPG type I, which is a commercially available product, and has a median particle diameter of 318.6 μm after swelling.
The cross-linking agent is an organic aldehyde high-temperature cross-linking agent.
The profile control system of the medium-high permeability high temperature oil reservoir of the embodiment mainly comprises the following components: the polymer comprises a polymer, PPG, a cross-linking agent and water, wherein the concentration of the polymer is 1200mg/L, PPG and the concentration of the cross-linking agent is 400mg/L.
Example 2
The profile control system of the medium-high permeability and high temperature oil reservoir in this embodiment is basically the same as that in embodiment 1, and differs only in that: the concentration of the polymer was 1800mg/L, PPG and 600mg/L.
Example 3
The profile control system of the medium-high permeability and high temperature oil reservoir in this embodiment is basically the same as that in embodiment 1, and differs only in that: the viscoelastic particles were type II PPG and after swelling the median particle size was 468.1 μm.
Example 4
The profile control system of the medium-high permeability and high temperature oil reservoir in this embodiment is basically the same as that in embodiment 2, and the difference is that: the viscoelastic particles were type II PPG and after swelling the median particle size was 468.1 μm.
Example 5
The profile control system of the medium-high permeability and high temperature oil reservoir in this embodiment is basically the same as that in embodiment 1, and differs only in that: the concentration of PPG was 600mg/L and the concentration of the crosslinking agent was 200mg/L.
Example 6
The profile control system of the medium-high permeability and high temperature oil reservoir in this embodiment is basically the same as that in embodiment 5, and the difference is that: the concentration of the crosslinking agent was 600mg/L.
Example 7
The profile control system of the medium-high permeability and high temperature oil reservoir in this embodiment is basically the same as that in embodiment 5, and the difference is that: the concentration of the polymer was 1600mg/L, PPG and 800mg/L.
Example 8
The profile control system of the medium-high permeability and high temperature oil reservoir in this embodiment is basically the same as that in embodiment 5, and the difference is that: the concentration of the polymer was 1600mg/L, PPG at 800mg/L and the concentration of the crosslinking agent was 600mg/L.
Example 9
The profile control system of the medium-high permeability and high temperature oil reservoir in this embodiment is basically the same as that in embodiment 1, and differs only in that: the concentration of the cross-linking agent was 200mg/L.
Example 10
The profile control system of the medium-high permeability and high temperature oil reservoir in this embodiment is basically the same as that in embodiment 1, and the difference is that: the concentration of the polymer was 1800mg/L, PPG at 600mg/L and the concentration of the crosslinking agent was 1000mg/L.
Example 11
The profile control system of the medium-high permeability and high temperature oil reservoir in this embodiment is basically the same as that in embodiment 9, and the difference is that: the concentration of the polymer was 1500mg/L, PPG at 375mg/L and the concentration of the crosslinking agent was 600mg/L.
Example 12
The profile control system of the medium-high permeability and high temperature oil reservoir in this embodiment is basically the same as that in embodiment 9, and the difference is that: the concentration of the polymer was 1900mg/L, PPG at 475mg/L and the concentration of the crosslinking agent at 1000mg/L.
Example 13
The profile control system of the medium-high permeability and high temperature oil reservoir in this embodiment is basically the same as that in embodiment 9, and the difference is that: the concentration of PPG was 300mg/L and the concentration of the crosslinking agent was 400mg/L.
Example 14
The profile control system of the medium-high permeability and high temperature oil reservoir in this embodiment is basically the same as that in embodiment 9, and the difference is that: the concentration of the polymer was 1500mg/L, PPG at 375mg/L and the concentration of the crosslinking agent was 600mg/L.
Example 15
The profile control system of the medium-high permeability and high temperature oil reservoir in this embodiment is basically the same as that in embodiment 9, and the difference is that: the concentration of the polymer was 1800mg/L, PPG at 450mg/L and the concentration of the crosslinking agent was 1000mg/L.
2. Comparative example
The following comparative examples all use this preparation method to prepare profile control systems, using the following steps:
(1) Adding the polymer into the stirring water uniformly, stirring and curing for 2-3 hours to prepare polymer mother solution with certain mass concentration;
(2) Vacuumizing and deoxidizing the polymer mother liquor and the preparation water, and controlling the oxygen content in the system to be lower than 1mg/L;
(3) Fully and uniformly mixing the polymer mother liquor after deoxidation, water and the organic aldehyde crosslinking agent in a closed state, and controlling the concentrations of the polymer and the crosslinking agent to be corresponding by adjusting the addition amounts of the polymer mother liquor, the water and the organic aldehyde crosslinking agent;
(4) And (3) placing the solution obtained in the step (3) in a closed container, controlling the ambient temperature to be 70 ℃, and enabling the system to crosslink into gel autonomously to obtain the polymer gel system.
Comparative example 1
The polymer and the crosslinking agent used in this comparative example were the same as in example 1.
The profile control system of the comparative example mainly comprises the following components: the polymer comprises a polymer, a cross-linking agent and water, wherein the concentration of the polymer is 1200mg/L, and the concentration of the cross-linking agent is 200mg/L.
Comparative example 2
The profile control system of this comparative example is substantially identical to that of comparative example 1, except that: the concentration of the crosslinking agent was 600mg/L.
Comparative example 3
The profile control system of this comparative example is substantially identical to that of comparative example 2, except that: the concentration of the polymer was 1500mg/L.
Comparative example 4
The profile control system of this comparative example is substantially identical to that of comparative example 1, except that: the concentration of the polymer was 1800mg/L and the concentration of the crosslinking agent was 750mg/L.
Comparative example 5
The profile control system of this comparative example is substantially identical to that of comparative example 1, except that: the concentration of the polymer was 1600mg/L and the concentration of the crosslinking agent was 600mg/L.
3. Experimental example
Experimental example 1 gel Strength
The gel strength of the profile control systems prepared in examples 1 to 15 and comparative examples 1 to 4 was measured at various times in this experimental example, and the results are shown in Table 1.
TABLE 1 gel strength of profile control system
Note that: * For detection using a Brookfield viscometer, rotor # 62, rotation speed at 6 rpm; other viscosities were measured using a Brookfield viscometer, rotor # 0, at a speed of 6 rpm.
As is clear from Table 1, examples 1 to 15 were higher in the speed of the sizing after the addition of the viscoelastic particles and higher in the strength after the sizing, as compared with comparative examples 1 to 4. The viscoelastic particles play a role of coacervation nuclei in the gelling process, so that the crosslinking reaction is promoted to start around the viscoelastic particles, and the gelling time of the profile control system is shortened; meanwhile, due to the effect of the viscoelastic particles serving as cores, the crosslinking reaction can be unfolded around the viscoelastic particles to form a more compact three-dimensional network structure (shown in figure 1) taking the viscoelastic particles as cores, so that the gel strength of the profile control system is higher, and the viscosity after gel formation is higher. The cross-linked gel system formed by the profile control system of comparative examples 1-4 has relatively weak compactness (shown in figure 2) of the three-dimensional network structure after gel formation and low viscosity.
Experimental example 2 Water drive flow distribution ratio and application of the invention in reverse water absorption profile of high-low permeability layer
The experimental examples were measured on the profile control systems prepared in example 1 and comparative example 5 by the following methods:
(1) 5 times the permeability level difference (300×10) -3 μm 2 /1500×10 -3 μm 2 ) The artificial core is displaced in a double-pipe parallel connection mode, water is driven to balance at 70 ℃, and the water drive split flow rate is measured.
(2) Injecting the profile control system 0.15PV prepared in the example 1 (or the comparative example 5) into the rock core at 70 ℃, and controlling injection pressure in the injection process to enable the profile control system to enter the hypertonic rock core as much as possible; closing the front and back valves of the displacement system, and waiting for 14 days at 70 ℃.
(3) And (3) performing a post-water flooding experiment, measuring the water flooding split flow rate again, closing the low-permeability layer after the post-water flooding is finished, and improving the injection speed until the pressure is stable.
The profile control system of example 1 is shown in fig. 3 as a water drive split flow curve of a double-pipe parallel core with 5-fold permeability level difference before and after profile control. As can be seen from the graph: permeability of 1634×10 before profile control -3 μm 2 The water drive split flow rate of the hypertonic core is about 80 percent, and the permeability is 319 multiplied by 10 -3 μm 2 The water drive split flow rate of the low permeability core is about 20 percent; after the profile control system of the example 1 with the injection of 0.15PV and the waiting for the solidification, the water-flooding diversion rate of the hypertonic core is reduced to about 20 percent, and the water-flooding diversion rate of the hypotonic core is increased to about 80 percent. Therefore, after the profile control system of the medium-high permeability high temperature oil reservoir is used for profile control, the water absorption profile of the high-low permeability core is reversed.
The profile control system of comparative example 5 was double-barrelled parallelly connected rock core of 5 times permeability level difference before and after profile controlThe water drive split ratio curve of (2) is shown in figure 4. As can be seen from the graph, the permeability of the cross-linked polymer profile control of 0.15PV is 1536×10 -3 μm 2 The water drive split flow rate of the hypertonic core is reduced from about 80 percent to 40 percent, and the permeability is 306 multiplied by 10 -3 μm 2 The water drive split rate of the hypotonic core is increased from 20% to 60%. The conventional crosslinked polymer plays a better role in profile control, but the profile control capability of the conventional crosslinked polymer is obviously poorer than that of the profile control system of the embodiment 1, and the inversion of the water absorption profile of the high-low permeability layer is difficult to realize.
At present, for the oil field subjected to chemical flooding such as high-power water flooding development and polymer, the injection resistance of a high-permeability layer is small, and the saturation of residual oil is low after long-term flushing of an oil displacement system; the low permeability layer has larger injection resistance, low water flooding multiple, relatively higher saturation of residual oil and relatively rich resource quantity, and is a resource foundation for further improving the recovery ratio in the later period of the old oil field. The profile control system for the medium-high permeability and high temperature oil reservoir can realize the inversion of the water absorption profile of the high-low permeability layer, so that an oil displacement system can more easily enter the low permeability layer with relatively blocked resources, effectively utilize the residual resources of the low permeability layer, and has excellent auxiliary effect on further improving the crude oil recovery efficiency in the later period of an old oil field.
Fig. 5 is a graph comparing the subsequent water flooding breakthrough pressure curves of the conventional cross-linked polymer profile control systems of example 1 and comparative example 5 in a hypertonic rock. It can be seen that under the same experimental conditions, the water flooding breakthrough pressure of the profile control system Hou Ningcheng of the embodiment 1 after the glue is higher than 0.05MPa, the water flooding breakthrough pressure of the profile control system of the comparative example 5 is 0.03MPa, and the water flooding breakthrough pressure of the embodiment 1 is increased by more than 60% compared with the water flooding breakthrough pressure of the comparative example 5, which indicates that the medium-high permeability high temperature oil reservoir profile control system has better plugging effect and scouring resistance on a high permeability layer, can effectively improve the injection pressure and prolong the profile control effective period, and is further beneficial to further improving the crude oil recovery ratio of an old oil field.
Claims (8)
1. The profile control system of the medium-high permeability high temperature oil reservoir is characterized by mainly comprising the following components: the polymer, the viscoelastic particles, the cross-linking agent and water, wherein the mass ratio of the polymer, the viscoelastic particles and the cross-linking agent is (12-19): (3-8): (2-10); the polymer is partially hydrolyzed polyacrylamide.
2. The profile control system for a medium-high permeability high temperature oil reservoir according to claim 1, wherein the viscoelastic particles have a post-swelling median particle size of 315-470 μm.
3. The profile control system for a medium-high permeability and high temperature oil reservoir according to claim 2, wherein the viscoelastic particles are granular viscoelastic polymers prepared by polymerization reaction with acrylamide as a basic monomer.
4. The profile control system for a medium-high permeability high temperature oil reservoir according to claim 1, wherein the degree of hydrolysis of the polymer is 17% -29%.
5. The profile control system for a medium-high permeability and high temperature oil reservoir according to claim 4, wherein the polymer has a number average molecular weight of 1500-3500 ten thousand.
6. The profile control system of a medium-high permeability and high temperature oil reservoir according to claim 4 or 5, wherein the concentration of the polymer in the profile control system is 1200-1900 mg/L.
7. The profile control system of a medium-high permeability high temperature oil reservoir according to claim 1, wherein the cross-linking agent is an organic aldehyde cross-linking agent.
8. Use of the profile control system of the medium-high permeability high temperature reservoir according to any one of claims 1-7 for achieving reverse water absorption profile of a high-low permeability layer.
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