CN113685155B - Yield increasing method for improving recovery ratio by injection and production in same well - Google Patents
Yield increasing method for improving recovery ratio by injection and production in same well Download PDFInfo
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- 238000002347 injection Methods 0.000 title claims abstract description 59
- 239000007924 injection Substances 0.000 title claims abstract description 59
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 40
- 230000001965 increasing effect Effects 0.000 title claims abstract description 34
- 238000011084 recovery Methods 0.000 title claims abstract description 18
- 239000004530 micro-emulsion Substances 0.000 claims abstract description 33
- 239000007789 gas Substances 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000003345 natural gas Substances 0.000 claims abstract description 9
- 239000003921 oil Substances 0.000 claims description 39
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 10
- 239000004094 surface-active agent Substances 0.000 claims description 6
- 239000005543 nano-size silicon particle Substances 0.000 claims description 5
- 239000003208 petroleum Substances 0.000 claims description 5
- 235000012239 silicon dioxide Nutrition 0.000 claims description 5
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 4
- 230000033444 hydroxylation Effects 0.000 claims description 3
- 238000005805 hydroxylation reaction Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 2
- 238000009491 slugging Methods 0.000 claims 2
- 238000005213 imbibition Methods 0.000 abstract description 7
- 239000012530 fluid Substances 0.000 abstract description 3
- 238000000605 extraction Methods 0.000 abstract description 2
- 230000035699 permeability Effects 0.000 abstract description 2
- 239000011148 porous material Substances 0.000 description 7
- 239000011159 matrix material Substances 0.000 description 6
- 239000000758 substrate Substances 0.000 description 6
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- 238000010586 diagram Methods 0.000 description 4
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- 230000009467 reduction Effects 0.000 description 3
- 230000002776 aggregation Effects 0.000 description 2
- 238000004220 aggregation Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
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- 230000000704 physical effect Effects 0.000 description 2
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- 230000000638 stimulation Effects 0.000 description 2
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- 238000010276 construction Methods 0.000 description 1
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- 239000011435 rock Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
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- 230000006641 stabilisation Effects 0.000 description 1
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- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 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
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/584—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific surfactants
-
- 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 provides a method for increasing the recovery ratio of injection and production in the same well, which comprises the following steps: when the yield of the production well is obviously reduced, the production well is subjected to a plurality of rounds of broken plug gas injection and broken plug microemulsion injection systems in an alternate injection mode, so that oil and water are fully imbibed and replaced, and the purpose of increasing the yield of the production well is further realized. The natural gas injection-microemulsion injection system-imbibition replacement-cyclic injection production process for a plurality of rounds can not only improve the extraction degree, but also increase the permeability of the fluid flow channel, and is an economic, practical, simple, easy-to-operate and environment-friendly new production increasing measure.
Description
Technical Field
The invention relates to a production increasing method for improving recovery ratio by injecting and producing in the same well, belonging to the technical field of oil production.
Background
When the oil well is pumped, oil in the matrix and the natural cracks can flow into the bottom of the well through the wide cracks due to pressure difference between the matrix, the cracks and the shaft. During the oil flow, when the matrix and natural fracture pores create a greater resistance, the oil will be retained, thereby reducing the well production. I.e. after a period of production time (typically several months, some as short as 2 months), the well production decreases rapidly or little oil is produced. For this situation, the usual stimulation is to drill a certain number of injection wells around the well with a certain well spacing and geometric pattern shape to perform advanced water or gas injection, and the water or gas injected by the injection well pattern can displace the retained oil to flow back to the bottom of the well; or some other stimulation of the production well, such as secondary fracturing, acidizing fracturing, repeated fracturing, etc., with the purpose of increasing the fluid flow path and increasing the oil flow capacity, thereby restoring production from the well. Although the methods have certain effects and are a production increasing mode commonly used at present, the problems are that the construction cost is very high, and the overall benefit is uncertain based on the reality that the physical properties of the existing developed reservoirs in China are poor.
Therefore, providing a novel production increasing method for improving recovery ratio by injecting and producing in the same well has become a technical problem to be solved in the field.
Disclosure of Invention
In order to solve the defects and shortcomings, the invention aims to provide a production increasing method for improving the recovery ratio by injecting and producing in the same well. The method provided by the invention realizes yield increase in a gas-liquid alternative injection mode, wherein the liquid phase is a microemulsion system containing the surfactant, so that the oil-water interfacial tension can be reduced, and the oil displacement efficiency can be improved.
In order to achieve the above object, the present invention provides a method for increasing the recovery ratio of injection and production in the same well, wherein the method for increasing the recovery ratio of injection and production in the same well comprises:
when the yield of the production well is obviously reduced, the production well is subjected to a plurality of rounds of broken plug gas injection and broken plug microemulsion injection systems in an alternate injection mode, so that oil and water are fully imbibed and replaced, and the purpose of increasing the yield of the production well is further realized.
Preferably, the method comprises: when the yield of the production well is obviously reduced, (1) the production well is subjected to slug gas injection and then is subjected to well sealing, and then the production well is subjected to slug gas injection and microemulsion system and then is subjected to well sealing;
(2) Repeating the step (1), and carrying out slug gas injection and slug microemulsion injection on the production well for a plurality of times to ensure that oil and water are fully imbibed and replaced, thereby realizing the purpose of increasing the yield of the production well.
In the above method, preferably, the gas injected by the broken plug gas injection is natural gas.
In the above method, preferably, the microemulsion system comprises 0.1 to 2wt% of petroleum sulfonate surfactant, 0.1 to 3wt% of surface-hydroxylated nano silicon dioxide and the balance water, based on 100% of the total weight of the microemulsion system.
Wherein, the petroleum sulfonate surfactant and the surface hydroxylation nano silicon dioxide are all conventional substances and can be obtained by commercial or self-made preparation.
In the above-described method, preferably, the particle diameter of the surface-hydroxylated nanosilica is 7 to 15nm.
In the above method, preferably, the time of slug injection is 5 hours in each round.
In the method described above, the well is preferably closed for 24 hours after the slug is injected with gas.
In the above method, preferably, the time for injecting the microemulsion system with the slugs is 10 hours in each round.
In the above method, preferably, the well is closed for 24 hours after the slug is injected into the microemulsion system.
In the above method, preferably, in step (2), the step (1) is repeated, and the three rounds of gas injection and microemulsion injection systems are performed on the production well, so that the oil water is fully imbibed and replaced, and the purpose of increasing the yield of the production well is further achieved.
When the yield of the production well is obviously reduced, the physical yield increasing method of the slug gas injection (such as natural gas) +slug gas injection microemulsion system is carried out on the production well, and the theory of the method is not that the traditional method for increasing the flow of fracturing cracks or high-pressure displacement oil drops is not that wettability, capillary pressure and the like are completely changed in a chemical mode. The core thought of the method provided by the invention is as follows: when the oil well is produced to a certain stage (the yield is obviously reduced), the pores of the matrix 2 and the natural cracks are contracted and closed due to the formation stress and the pressure difference between the production well 1, so that the flow difficulty of the oil drops 3 is increased. When the substrate and the natural fracture 5 are contracted and closed, the flowing micro-pore channel is changed, the pore throat resistance is greatly increased, oil is difficult to pass through the pore throat of the circulating channel, oil drops are scattered or small strands exist at the large pore channels of the substrate and the natural fracture, and the oil gas remained in the substrate and the fracture (comprising the natural fracture 5 and the hydraulic fracture 4) is more (shown in figure 1) due to the small obstruction of the circulating channel or the obstruction of a certain circulating channel, so that the yield increasing measure with high cost is blindly adopted at the moment, and the effect is not necessarily obvious.
The technical scheme provided by the invention is that after the yield of the production well is obviously reduced, the production well is subjected to slug gas injection and slug gas injection replacement for a plurality of rounds in an alternate injection mode, so that oil and water are fully imbibed and replaced, and the purpose of increasing the yield of the production well is further realized; the injection system takes the principle that the physical properties of the reservoir are not destroyed, and the technical scheme has the following three functions:
firstly, it is: the pressure of the injected natural gas can force the matrix and the natural crack channel to slightly increase, so that the binding pressure of oil drops is directly changed, the adhesive force of the oil drops is reduced, the oil drops are easy to flow, some micro-pore oil drops can pass through a narrow channel, and most of the easy-to-flow oil drops can be concentrated in a larger aggregation area of a storage space according to the minimum resistance principle; and the flow of the air flow 6 will flush the flow channel, making the oil droplets easier to flow and concentrate, as shown in fig. 2.
Secondly, it is: the main purpose of the injected microemulsion system is to reduce the oil-water interfacial tension in the pressure-holding stage and fully generate the imbibition process of oil-gas displacement besides enlarging and flushing the flow channel.
Thirdly, the method comprises the following steps: the injected natural gas-microemulsion system increases the formation pressure, forces the imbibition process to accelerate, i.e. the liquid remaining in the reservoir has more low salinity liquid to flow into the matrix under the action of imbibition force, more oil drops can be necessarily replaced according to the principle of mass conservation, and the oil drops can be concentrated in an aggregation area which is easy to store, as shown in fig. 3. At this time, the oil droplets are distributed at a place where they are easy to store, or sporadically, or in a line, or even in a sheet.
When the production well is normally produced, the pressure of the substrate is relieved to the bottom of the well, at the moment, the natural gas flow (namely the oil gas flowing direction 7) drives part of the substrate and oil drops of the natural cracks to be more concentrated, and meanwhile, the flowing channel flowing to the bottom of the well is smoother, so that the oil drops can flow into the bottom of the well more easily, and the dual purposes of improving the imbibition efficiency and the flowing efficiency of the flowing channel are achieved, as shown in fig. 4; the natural gas injection-microemulsion injection system-imbibition replacement-several rounds of cyclic injection-production process can replace more oil drops, can increase the permeability of a fluid flow channel, and is a new economic, practical, simple, easy-to-operate and environment-friendly yield increasing measure.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for the description of the embodiments will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the crack and drop distribution (drop blocking in the flow path) under well production conditions in accordance with the present invention.
FIG. 2 is a schematic diagram of the distribution of cracks and oil droplets (micro-cracks, flushing flow channels) under well injection conditions in the present invention.
Fig. 3 is a schematic diagram of oil droplet imbibition and concentration in the pressure holding stage of the invention.
FIG. 4 is a schematic diagram showing the micro-closure of cracks and the flow of gas and water flushing flow channels and the flow of gas driving oil drops in the production process of the invention.
The main reference numerals illustrate:
1. a production well;
2. a substrate;
3. oil drops;
4. hydraulic fracturing;
5. natural cracking;
6. a gas flow;
7. the direction of the oil and gas flow.
Detailed Description
In order to make the technical features, objects and advantageous effects of the present invention more clearly understood, the technical aspects of the present invention will now be described in detail with reference to the following specific examples, but should not be construed as limiting the scope of the present invention.
Experimental example 1
The embodiment provides a production increasing method for improving recovery ratio by injecting and producing in the same well, which comprises the following steps:
the microemulsion system prepared in this example contained 1 part by weight of petroleum sulfonate surfactant, 1.5 parts by weight of surface-hydroxylated nanosilica and 97.5 parts by weight of water, usingPermeability of 50X 10 -3 μm 2 The extraction performance of the yield increasing method is evaluated by using water after the core is saturated with oil, then the core is subjected to slug injection of natural gas for 5 hours, a well is simulated for 24 hours, the microemulsion system is simulated for 10 hours, the well is simulated for 24 hours, the repeated three times of slug injection gas-slug injection microemulsion system alternate injection are carried out, and then water injection is carried out, so that the obtained experimental results are shown in the following table 1.
TABLE 1 gas-slug injection microemulsion systems for enhanced recovery
As can be seen from Table 1, after the alternative injection of the slug gas injection-slug microemulsion system by adopting the production increasing method of improving the recovery ratio by injection and production in the same well, the total recovery ratio is improved by 16.23 percent compared with the water flooding recovery ratio.
Experimental example 2
The embodiment is selected from natural rock cores of dense reservoirs of long-day oil fields to perform displacement experiments so as to evaluate the pressure reduction and injection increasing effects of the production increasing method for improving the recovery ratio by injecting and producing in the same well.
The microemulsion system prepared in this example comprises 1 part by weight of petroleum sulfonate surfactant, 1.5 parts by weight of surface hydroxylated nano silicon dioxide and 97.5 parts by weight of water, water flooding is performed at a constant flow rate of 0.5mL/min, after pressure stabilization, natural gas is injected into the microemulsion system in a slug way for 5 hours, well holding is simulated for 24 hours, the microemulsion system is injected into the slug way for 10 hours, well holding is simulated for 24 hours, and three times of alternating injection of the slug way gas injection-slug way microemulsion system are repeated, water flooding is performed, and the experimental results are shown in the following table 2.
TABLE 2 pressure-reducing and injection-increasing effects of slug gas-slug microemulsion systems
From the above table 2, it can be seen that after the alternative injection of the slug gas injection-slug injection microemulsion system is performed by adopting the production increasing method of improving the recovery ratio by injection production in the same well, the injection pressure is reduced by 24.3%, which indicates that the method has better pressure reduction and injection increasing effects.
In conclusion, the method for increasing the recovery ratio by injecting and producing in the same well provided by the embodiment of the invention not only can increase the recovery ratio, but also has better pressure reduction and injection increase effects.
The foregoing description of the embodiments of the invention is not intended to limit the scope of the invention, so that the substitution of equivalent elements or equivalent variations and modifications within the scope of the invention shall fall within the scope of the patent. In addition, the technical features and the technical features, the technical features and the technical invention can be freely combined for use.
Claims (7)
1. The method for increasing the recovery ratio of the same-well injection and production is characterized by comprising the following steps of:
when the yield of the production well is obviously reduced, (1) the production well is subjected to slug gas injection and then is subjected to well sealing, and then the production well is subjected to slug gas injection and microemulsion system and then is subjected to well sealing;
(2) Repeating the step (1), and carrying out slug gas injection and slug microemulsion injection on the production well for a plurality of times to ensure that oil and water are fully imbibed and replaced, thereby realizing the purpose of increasing the yield of the production well;
wherein, based on 100 percent of the total weight of the microemulsion system, the microemulsion system comprises 0.1 to 2 percent by weight of petroleum sulfonate surfactant, 0.1 to 3 percent by weight of surface hydroxylation nano silicon dioxide and the balance of water; the particle size of the surface hydroxylation nano silicon dioxide is 7-15nm.
2. The method of claim 1, wherein the gas injected by the broken plug gas injection is natural gas.
3. A method according to claim 1 or 2, wherein the slug injection time is 5 hours in each round.
4. The method of claim 1 or 2, wherein the slugging is followed by a well for 24 hours.
5. A method according to claim 1 or 2, wherein the time for the slug injection of the microemulsion system is 10 hours in each round.
6. The method of claim 1 or 2, wherein the slugging is performed for 24 hours after the microemulsion system is injected.
7. The method according to claim 1 or 2, wherein in the step (2), the step (1) is repeated, and the three rounds of slug gas injection and slug microemulsion injection systems are carried out on the production well, so that oil and water are fully imbibed and replaced, and the purpose of increasing the production of the production well is achieved.
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| FR2764632B1 (en) * | 1997-06-17 | 2000-03-24 | Inst Francais Du Petrole | ASSISTED RECOVERY OF PETROLEUM FLUIDS IN A SUBTERRANEAN DEPOSIT |
| CA2865961C (en) * | 2012-03-23 | 2019-10-29 | Saudi Arabian Oil Company | In-situ self diverting wag process |
| CN105089573A (en) * | 2015-07-21 | 2015-11-25 | 中国石油天然气股份有限公司 | Recovering method for improving substrate and microfracture oil flooding efficiency in dual medium reservoir gas injection |
| CN106089166A (en) * | 2016-06-17 | 2016-11-09 | 中国石油大学(华东) | A kind of fine and close oil reservoir CO2foam handle up improve recovery ratio method |
| CA3038988C (en) * | 2016-11-11 | 2021-02-16 | Halliburton Energy Services, Inc. | Treating a formation with a chemical agent and liquefied natural gas (lng) de-liquefied at a wellsite |
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