CN111396006A - Treatment method for thickening extra-heavy oil solution-cavity type oil reservoir by injecting nitrogen into crude oil - Google Patents
Treatment method for thickening extra-heavy oil solution-cavity type oil reservoir by injecting nitrogen into crude oil Download PDFInfo
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 242
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 117
- 230000008719 thickening Effects 0.000 title claims abstract description 59
- 239000003921 oil Substances 0.000 title claims abstract description 56
- 239000010779 crude oil Substances 0.000 title claims abstract description 51
- 239000000295 fuel oil Substances 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000002347 injection Methods 0.000 claims abstract description 67
- 239000007924 injection Substances 0.000 claims abstract description 67
- 238000004519 manufacturing process Methods 0.000 claims abstract description 27
- 238000012360 testing method Methods 0.000 claims abstract description 6
- 238000005553 drilling Methods 0.000 claims abstract description 5
- 239000003638 chemical reducing agent Substances 0.000 claims description 55
- 239000007789 gas Substances 0.000 claims description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 230000008569 process Effects 0.000 claims description 11
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 8
- 238000006073 displacement reaction Methods 0.000 claims description 8
- 238000013461 design Methods 0.000 claims description 4
- 241000237858 Gastropoda Species 0.000 claims description 3
- XQCFHQBGMWUEMY-ZPUQHVIOSA-N Nitrovin Chemical compound C=1C=C([N+]([O-])=O)OC=1\C=C\C(=NNC(=N)N)\C=C\C1=CC=C([N+]([O-])=O)O1 XQCFHQBGMWUEMY-ZPUQHVIOSA-N 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 238000003672 processing method Methods 0.000 claims 1
- 238000011161 development Methods 0.000 abstract description 6
- 238000011084 recovery Methods 0.000 abstract description 3
- 238000000605 extraction Methods 0.000 description 10
- 239000003129 oil well Substances 0.000 description 7
- 238000007254 oxidation reaction Methods 0.000 description 7
- 230000003647 oxidation Effects 0.000 description 6
- 230000009467 reduction Effects 0.000 description 6
- 230000018109 developmental process Effects 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000000638 stimulation Effects 0.000 description 3
- 238000010795 Steam Flooding Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033558 biomineral tissue development Effects 0.000 description 1
- 235000019994 cava Nutrition 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000004945 emulsification Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 239000002332 oil field water Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- 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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Abstract
The invention belongs to the technical field of nitrogen injection development of an extra-heavy oil fracture-cavity type oil reservoir, and particularly relates to a treatment method for thickening extra-heavy oil solution-cavity type oil reservoir by injecting nitrogen into crude oil. The treatment method for thickening the extra-heavy oil cavern type oil reservoir by injecting nitrogen comprises the following steps: (1) reclassifying the nitrogen-injected crude oil thickening wells of the extra-heavy oil cavern type oil reservoir according to the types of the reservoirs based on well logging, well drilling and production profile test data and nitrogen injection production characteristics; (2) different treatment systems are established according to the reservoir body classification of the thickening well. The method can realize the production recovery of the extra-heavy oil fracture-cavity type oil reservoir, particularly the nitrogen injection thickening well of the extra-heavy oil solution-cavity type oil reservoir, and provides support for the nitrogen injection high-efficiency operation of the extra-heavy oil solution-cavity type oil reservoir.
Description
Technical Field
The invention belongs to the technical field of nitrogen injection development of an extra-heavy oil fracture-cavity type oil reservoir, and particularly relates to a treatment method for thickening extra-heavy oil solution-cavity type oil reservoir by injecting nitrogen into crude oil.
Background
The reservoir heterogeneity of the fracture-cavity type oil reservoir is extremely strong, the spatial relationship of the fracture-cavity is various, the nitrogen injection has become the strategic replacing technology after the water drive of the fracture-cavity type oil reservoir at present, but with the enlargement of the scale of the nitrogen injection, the amount of nitrogen injected into the stratum is increased, the crude oil viscosity is increased due to the extraction of the nitrogen and the oxidation of the crude oil carried by the nitrogen injection, the normal production of the oil well is seriously influenced, for the extra-thick oil, the viscosity is high, the heavy component content is high, after the nitrogen injection, the light component is further consumed due to the extraction and the oxidation, the development difficulty of the nitrogen injection is deepened, and the following problems are specifically existed:
1) nitrogen is injected to perform immiscible gravity displacement, nitrogen near a shaft is enriched after multiple periods, and the thickening is aggravated by extraction and oxidation, so that the crude oil is thickened.
2) The fracture-cavity type oil reservoir body has complex space, the distribution difference of thickened products is large after the special heavy oil different types of reservoir bodies are thickened by injecting nitrogen, and the exploitation difficulty is increased if the fracture-cavity type reservoir bodies have the problem that the thickened products block a gas flow channel and a crude oil flow channel.
3) The prior art adopting large-gap thick oil pump and other technologies can only solve the effect of near-well thickening, can not effectively solve the problem of far-end thickening around a well, and can not lead a part of reservoirs to be normally produced by opening the well.
CN 104863557A discloses an experimental device and method for steam-nitrogen-viscosity reducer combined stimulation of an ultra-heavy oil reservoir, and provides an experimental method for simulating the steam-nitrogen-viscosity reducer combined stimulation development of the ultra-heavy oil reservoir, so that the simulation of an injection process, a bright well process and an output process in the steam-nitrogen-viscosity reducer combined stimulation process can be realized, and the temperature, the pressure and the exploitation effect in the exploitation process can be monitored in real time. The technology applies the oil reservoir type to the oil reservoir with low heterogeneity and continuous oil layer; the application aims at the low displacement efficiency of the ultra-thick oil steam flooding and is provided for improving the displacement efficiency; the applied action mechanism is mainly steam flooding and viscosity reducer, the nitrogen plays a role in heat insulation, and the nitrogen has little influence on the viscosity of the crude oil. Not matching the present invention in terms of application objects and the like.
Disclosure of Invention
The invention aims to provide a method for treating the thickening of crude oil injected into an extra-heavy oil fracture-cavity type oil reservoir, which can realize the recovery of the extra-heavy oil fracture-cavity type oil reservoir, particularly an extra-heavy oil fracture-cavity type oil reservoir and provide support for the efficient operation of nitrogen injection of the extra-heavy oil fracture-cavity type oil reservoir, aiming at the problems that crude oil thickening and exploitation are difficult due to the extraction of crude oil by nitrogen and the oxidation of crude oil by oxygen in gas in the extra-heavy oil fracture-cavity type oil reservoir and the defects that the conventional method is difficult to control and cannot effectively solve the thickening at the far end of the periphery of a well.
The technical scheme of the invention is as follows: a treatment method for thickening extra heavy oil cavern type oil deposit by injecting nitrogen into crude oil comprises the following steps:
(1) reclassifying the nitrogen-injected crude oil thickening wells of the extra-heavy oil cavern type oil reservoir according to the types of the reservoirs based on well logging, well drilling and production profile test data and nitrogen injection production characteristics; the actual contact relation between injected formation gas and crude oil is combined, the proportion of the current reservoir type of the reservoir in the pay zone around the thickening well is taken as a dividing basis, and the thickening well is divided into a cavern type or a fracture-cavern type again;
(2) establishing different treatment systems according to the reservoir body classification of the thickening well in the step (1): the karst cave type thickening well adopts a mode of injecting nitrogen to carry a water-soluble viscosity reducer; the crack-hole thickening well adopts a mode of alternately injecting water-soluble viscosity reducer carried by large-discharge gas injection and nitrogen injection.
The dosage of the water-soluble viscosity reducer in the step (2) is 3000-5000 ppm.
The water-soluble viscosity reducer in the step (2) is at least one of TSWR-7, TSWR-6 and CYSWR-1.
If the drainage lost circulation well is directly drilled in the step (1) and the production zone section is a drainage lost circulation section, dividing the well into a cavern type; if the anti-lost circulation well is directly drilled, but the current producing layer is above the emptying lost circulation section, gas is replaced above the emptying lost circulation section, and the well is divided into a crack-hole type according to the well logging characteristics.
The concrete operation of the karst cave thickening well that nitrogen is injected to carry the water-soluble viscosity reducer is as follows: nitrogen gas injection
In the process, adding the water-soluble viscosity reducer into the nitrogen-injected water, and stopping when the nitrogen injection amount is finished in the period design.
The nitrogen discharge capacity of the nitrogen injection is 2400m in standard state3/h。
The crack-hole thickening well adopts large-discharge gas injection and nitrogen injection to carry water-soluble viscosity reducer for alternate injection
The specific operation is as follows: firstly, the grain size is more than or equal to 5000m3Injecting a slug of nitrogen gas into the reactor with large discharge volume, and adding water-soluble viscosity-reducing agent into the nitrogen-injected mixed waterInjecting a slug of nitrogen carrying water-soluble viscosity reducer, and repeating the steps in the same manner to alternately inject the water-soluble viscosity reducer into the container. Injecting nitrogen with large discharge to wash out heavy components, dispersing heavy frameworks, communicating other reservoir bodies and ensuring the smoothness of crude oil flow channels blocked by extraction on crack surfaces; nitrogen is injected to carry the water-soluble viscosity reducer, the viscosity reducer is fully dissolved in the produced crude oil, and the extraction and oxidation of the crude oil by the nitrogen are reduced.
First, nitrogen 10 × 10 was injected at a large discharge rate4m3Then, injecting a slug of nitrogen gas carrying water-soluble viscosity reducer, wherein the nitrogen gas carrying water-soluble viscosity reducer is injected in an amount of 10 × 104m3。
And combining the large-discharge nitrogen injection slug and the slug of the nitrogen carrying water-soluble viscosity reducer as one slug, and sequentially combining 5 slugs to achieve the purposes of repeated flushing and repeated viscosity reduction.
The invention has the beneficial effects that: the treatment method for thickening the extra-heavy oil solution-cavity type oil reservoir by injecting the nitrogen crude oil applies the fracture-cavity type oil reservoir with extremely strong heterogeneity, particularly the solution-cavity type oil reservoir. The application of the treatment method aims to solve the problem that the viscosity of crude oil is increased after a large amount of nitrogen is injected into an extra-heavy oil reservoir, and the treatment method is provided for smooth production; the method is characterized in that based on the geology of an oil well and nitrogen injection data, nitrogen injection crude oil thickening wells of the extra-heavy oil cavern type oil reservoir are divided and classified again according to the types of reservoirs, and according to different reservoir thickening generation mechanisms of the extra-heavy oil reservoir, a set of systematic and complete method for specifically treating crude oil thickening according to the types of the newly divided reservoirs after extra-heavy oil cavern type oil is thickened by nitrogen injection is established, so that the pertinence is stronger, the solution effect is better, and the treatment efficiency is higher; and the stable production recovery of the extra-heavy nitrogen injection gas well after nitrogen injection is realized, and the support is provided for the efficient operation of nitrogen injection of the extra-heavy oil solution cavity type oil reservoir. The nitrogen in the invention plays a role in high carrying on the viscosity reducer in solving the thickening problem.
Drawings
FIG. 1 is a schematic illustration of a pay zone being a cavernous reservoir.
FIG. 2 is a schematic representation of a reservoir after a re-classification of a cavernous reservoir.
FIG. 3 is a gas transverse distribution pattern (displacement is underground, 1 m) of different gas injection velocities in example 23
Subsurface volume equal to 304m3Volume of standard state).
Detailed Description
The present invention will be described in detail below with reference to examples.
Example 1
The treatment method for thickening the extra-heavy oil cavern type oil reservoir by injecting nitrogen comprises the following steps:
(1) reclassifying the nitrogen-injected crude oil thickening wells of the extra-heavy oil cavern type oil reservoir according to the types of the reservoirs based on well logging, well drilling and production profile test data and nitrogen injection production characteristics; the nitrogen density is low and is only 0.32-0.33 g/cm3The nitrogen injected into the stratum moves towards the upper part and gathers and is contacted with crude oil in the gathering and transporting processes, so that the actual contact relationship between injected stratum gas and crude oil is combined, the contact between the nitrogen and the crude oil in the current production zone is comprehensively considered, the proportion of the type of the reservoir body of the current production zone around the thickening well is taken as a dividing basis, and when the air leakage well is directly drilled and encountered and the production zone is an air leakage zone, the thickening well is re-divided into a cavern type;
(2) establishing different treatment systems according to the reservoir body classification of the thickening well in the step (1): the karst cave type thickening well carries the water-soluble viscosity reducer by injecting nitrogen, and the concrete operation is as follows: in the gas injection process, 3000-5000 ppm of water-soluble viscosity reducer TSWR-7 is added into nitrogen-injected mixed water, and the nitrogen discharge is 2400m in a standard state3H; the water-soluble viscosity reducer is carried to the far end around the well by gas, and is dissolved in the produced crude oil by the stirring action of the gas, so that underground viscosity reduction is realized, the extraction and oxidation reactions of the crude oil by nitrogen are reduced, and the crude oil thickening is prevented. And stopping when the nitrogen injection amount is finished in the period design.
The dosage and proportion of the nitrogen-carried water-soluble viscosity reducer are detailed in the following table 1.
TABLE 1 dosage ratio of nitrogen carrying water-soluble viscosity reducer
| Type of viscosity reducer | Design gas injection amount/Wanfang | Gas-water ratio | Accompanying water volume/formula | Dosage/formula of viscosity reducer | Nitrogen/viscosity reducer |
| TSWR-7 | 100 | 500 | 2000 | 6-8 | 125000-166667 |
| TSWR-7 | 100 | 600 | 1667 | 5-6.67 | 149925-200000 |
| TSWR-7 | 100 | 700 | 1429 | 4.29-5.72 | 174825-233100 |
| TSWR-7 | 100 | 800 | 1250 | 3.75-5 | 200000-266667 |
As can be seen from Table 1, the ratio between nitrogen and the water-soluble viscosity reducing agent is determined mainly by the amount of water accompanying the amount of nitrogen injected, according to the injection amount of 100 × 104m3The ratio of nitrogen to gas-water is 500: 1, calculating the water accompanying quantity of 2000m3If the viscosity is 6-8 m, the water-soluble viscosity reducer is required3。
A viscosity reducer solution with the concentration of 5000ppm is prepared by using oil field water with the mineralization degree of 221400 mg/L, the mixture is aged for 10 days at the temperature of 130 ℃, a thick oil emulsification viscosity reduction experiment is carried out by using the aged viscosity reducer solution, the oil-water ratio is 1:1, the system state is observed after the mixture is fully stirred, the viscosity is tested, a wellhead original oil sample with the viscosity of 32000 mPa.s (50 ℃) is obtained, and the experiment result is shown in Table 2.
TABLE 2 data of various viscosity-reducing agent indoor evaluation experiments (unit:%)
| Type of medicament | Well-1 | Well-2 | Well-3 | Well-4 | Well-5 | Well-6 | Well-7 | Well-8 | Average viscosity reduction rate |
| TSWR-7 | 97.6 | 95.8 | 96 | 87.3 | 97.6 | 91.5 | 97.1 | 98.4 | 95.2 |
| TSWR-6 | 93.6 | 94.8 | 91.1 | 83.7 | 93.8 | 88.7 | 91.9 | 87.8 | 90.7 |
| ACSQ-4 | 83.6 | 93.9 | 91.3 | 24.2 | 28.1 | 81.5 | 91.2 | 34.6 | 66 |
| SC-2 | 81.3 | 93.3 | 90.6 | 81.4 | 94.7 | 90.9 | 94.4 | 84.3 | 88.7 |
| SDG-3 | 76.8 | 90.9 | 88.9 | 36.7 | 82.7 | 81.3 | 90.9 | 38.9 | 73.4 |
The results in Table 2 show that the viscosity reduction rate of TSWR-7 is above 95%, and that it is not inactivated after aging at 130 ℃.
Example 2
The treatment method for thickening the extra-heavy oil cavern type oil reservoir by injecting nitrogen comprises the following steps:
(1) reclassifying the nitrogen-injected crude oil thickening wells of the extra-heavy oil cavern type oil reservoir according to the types of the reservoirs based on well logging, well drilling and production profile test data and nitrogen injection production characteristics; the nitrogen density is low and is only 0.32-0.33 g/cm3The nitrogen injected into the stratum moves towards the upper part and gathers and is contacted with crude oil in the gathering and transporting processes, so the actual contact relationship between the injected stratum gas and the crude oil is combined, the contact between the nitrogen and the crude oil in the current production zone is comprehensively considered, the proportion of the current reservoir type of the production zone around the thickening well is taken as a dividing basis, and when the air-tight loss well is directly drilled and encountered, but the current production zone is above an air-release loss section, and gas is subjected to a replacement action above the air-release loss section, the thickening well is re-divided into crack-hole types according to the well logging characteristics. For example, in the case of a well, the well 5509.60m is lost circulation and mud 448m is lost circulation3The reservoir is a karst cave reservoir, the water content is high before gas injection, and the residual oil above a leakage layer is used for gas injection, which is shown in figure 2. Therefore, the current main producing zone is 5493.5-5509.6m, and after the proportion method is adopted, the II and III reservoirs are main reservoirs and are fracture-hole type reservoirs, and the table 3 shows.
TABLE 3 well logging interpretation data sheet for the well in step (1)
(2) Establishing different treatment systems according to the reservoir body classification of the thickening well in the step (1): the crack-hole thickening well adopts a mode of alternately injecting water-soluble viscosity reducer carried by large-discharge gas injection and nitrogen injection, and the method specifically comprises the following operation: firstly, high-pressure gas injection equipment is adopted to inject gas with the pressure of more than or equal to 5000m3A large discharge of nitrogen per hour is injected in a slug with a nitrogen injection rate of 10 × 104m3Adding 3000-5000 ppm of water-soluble viscosity reducer TSWR-7 into nitrogen-injected mixed water, and injecting a slug of nitrogen-carried water-soluble viscosity reducer with the nitrogen injection amount of 10 × 104m3(ii) a And by parity of reasoning, alternate injection is carried out in sequence. Taking the large-discharge nitrogen injection slug and the nitrogen-carried water-soluble viscosity reducer slug as a slug groupAnd 5 slugs are combined in sequence to achieve the purposes of repeated flushing and repeated viscosity reduction.
Compared with a karst cave type reservoir, the fracture-cave type reservoir is a combination of small caves and is a corrosion cave formed by connecting fractures in series, the fractures play a role in communication, the width and the size of the fractures are greatly changed, crude oil extraction is easy to butt joint and overlap at the fractures after nitrogen injection, the internal diameter of the fractures is narrowed, and the contact between crude oil and injected nitrogen is limited by the type of the reservoir. The numerical simulation and field test results show that the horizontal initial velocity of the gas is improved by injecting high-speed nitrogen into the stratum, the inner wall of the crack can be swept, the thickness of the extract is reduced, the gas penetrating capacity and the sweeping capacity are improved, and meanwhile, the injected gas can be blown into the karst cave along the crack, so that the communication of the karst cave is realized. For the thickened well caused by the extra-thick oil, the horizontal initial speed is increased after the large discharge amount is reached, purging can be carried out, then communication is carried out, nitrogen is injected to carry the water-soluble viscosity reducer after the large discharge amount is purged and communicated, a channel can be purged, the viscosity reducer is fully contacted and dissolved with the extract, the thick oil with large particles is fully dissolved, the extraction and oxidation of the crude oil by the nitrogen are reduced, the extraction influence is removed, and the normal production of the oil well is realized.
Case 1
Taking A well as an example, the treatment method is applied to the field, and the well is completed with the loss of 388m3The viscosity of crude oil at 50 ℃ is 13689 mPa.s, the crude oil belongs to extra-heavy oil, a production mode of thin oil is adopted for an oil well before nitrogen injection, the thin oil injection ratio is 1.25, the oil well belongs to a karst cave type reservoir body after the current reservoir body type is newly divided, nitrogen injection construction is started in 2018, the oil well cannot normally produce after the well is opened, the lifting is difficult, the thin oil injection ratio can normally produce after the thin oil injection ratio is increased to 3.66, the production with the thin oil injection ratio before injection can be recovered after 36 days of production, and after nitrogen injection in 2019 in the second period of 4 months, an injection mode of carrying a water-soluble viscosity reducer by nitrogen is adopted, and the water-soluble viscosity reducer is configured in water injection at the concentration of 4000 ppm. The well is injected with 80 ten thousand square of nitrogen in the second period, and the gas-water ratio is 800: 1, and therefore, a water-soluble viscosity reducer 8 is required together with 1000 parts of water, and the water-soluble viscosity reducer is prepared according to 4000ppm and injected into a well together with nitrogenAnd (4) a barrel. The well is opened smoothly after gas injection, the viscosity of the oil well is restored to the level before gas injection, the problems of pump blockage, high current of the oil pumping unit and the like in the nitrogen preparation and thickening process do not occur in the production process, the efficient development of the extra-heavy oil by injecting nitrogen is effectively ensured, and the method has good popularization and application prospects in the development of extra-heavy oil reservoirs.
Claims (9)
1. A treatment method for thickening extra heavy oil cavern type oil deposit by injecting nitrogen into crude oil is characterized by comprising the following steps:
(1) reclassifying the nitrogen-injected crude oil thickening wells of the extra-heavy oil cavern type oil reservoir according to the types of the reservoirs based on well logging, well drilling and production profile test data and nitrogen injection production characteristics; the actual contact relation between injected formation gas and crude oil is combined, the proportion of the current reservoir type of the reservoir in the pay zone around the thickening well is taken as a dividing basis, and the thickening well is divided into a cavern type or a fracture-cavern type again;
(2) establishing different treatment systems according to the reservoir body classification of the thickening well in the step (1): the karst cave type thickening well adopts a mode of injecting nitrogen to carry a water-soluble viscosity reducer; the crack-hole thickening well adopts a mode of alternately injecting water-soluble viscosity reducer carried by large-discharge gas injection and nitrogen injection.
2. The treatment method for thickening crude oil in the extra-heavy oil vug-soluble oil reservoir by injecting nitrogen according to claim 1, wherein the dosage of the water-soluble viscosity reducer in the step (2) is 3000-5000 ppm.
3. The treatment method for thickening crude oil in the extra-heavy oil cavern type oil reservoir by injecting nitrogen according to claim 1, wherein the water-soluble viscosity reducer in the step (2) is at least one of TSWR-7, TSWR-6 and CYSWR-1.
4. The treatment method for thickening crude oil injected with nitrogen for the extra-heavy oil cavern-type oil reservoir according to claim 1, wherein in the step (1), if a vent leakage well is directly drilled and a production zone section is a vent leakage section, the treatment method is divided into cavern types; if the anti-lost circulation well is directly drilled, but the current producing layer is above the emptying lost circulation section, gas is replaced above the emptying lost circulation section, and the well is divided into a crack-hole type according to the well logging characteristics.
5. The processing method for thickening crude oil in the extra-heavy oil vug-dissolving reservoir by injecting nitrogen according to claim 1, wherein the vug-dissolving thickening well is specifically operated by injecting nitrogen to carry a water-soluble viscosity reducer as follows: and in the nitrogen injection process, adding the water-soluble viscosity reducer into the nitrogen injection water, and stopping when the nitrogen injection amount is finished in the period design.
6. The treatment method for thickening crude oil injected with nitrogen in the extra-heavy oil vug-soluble oil reservoir according to claim 5, wherein the nitrogen displacement of the injected nitrogen is 2400m in standard state3/h。
7. The method for treating crude oil thickening of the extra-heavy oil vug-soluble reservoir by injecting nitrogen according to claim 1, wherein the fracture-vug type thickening well adopts the specific operation of alternately injecting large-displacement gas injection and nitrogen injection carrying water-soluble viscosity reducer as follows: firstly, the grain size is more than or equal to 5000m3Injecting a slug of nitrogen gas into the nitrogen-injected mixed water at a large discharge rate/h, adding a water-soluble viscosity reducer into the nitrogen-injected mixed water, injecting a slug of nitrogen gas carrying a water-soluble viscosity reducer, and repeating the steps in the same way to perform alternate injection in sequence.
8. The treatment method for thickening crude oil in the extra-heavy oil cavern type oil reservoir by injecting nitrogen according to claim 7, wherein nitrogen 10 × 10 is injected at first in large displacement4m3Then, injecting a slug of nitrogen gas carrying water-soluble viscosity reducer, wherein the nitrogen gas carrying water-soluble viscosity reducer is injected in an amount of 10 × 104m3。
9. The method for treating the thickening of the crude oil injected with nitrogen in the extra-heavy oil cavern-type oil reservoir according to claim 7, wherein the large-displacement nitrogen injection slug and the slug of the nitrogen-carrying water-soluble viscosity reducer are combined as one slug, and then 5 slugs are combined in sequence.
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| RU2752802C1 (en) * | 2020-10-26 | 2021-08-06 | Публичное акционерное общество "Газпром нефть" (ПАО "Газпром нефть") | Method for determining porosity and permeability characteristics of reservoir and method for increasing petroleum recovery thereby |
| CN115387767A (en) * | 2021-05-20 | 2022-11-25 | 中国石油化工股份有限公司 | Steam huff-puff effect-inducing superposition viscosity reducer flooding method for deep extra-heavy oil reservoir |
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