CN113250662A - Imbibition oil production method suitable for low-permeability reservoir and laboratory simulation method - Google Patents
Imbibition oil production method suitable for low-permeability reservoir and laboratory simulation method Download PDFInfo
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- CN113250662A CN113250662A CN202110673799.0A CN202110673799A CN113250662A CN 113250662 A CN113250662 A CN 113250662A CN 202110673799 A CN202110673799 A CN 202110673799A CN 113250662 A CN113250662 A CN 113250662A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/20—Displacing by water
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
Abstract
The invention discloses a imbibition oil extraction method and a laboratory simulation method suitable for a low-permeability oil reservoir, which can effectively improve the oil extraction efficiency by carrying out imbibition oil extraction on the low-permeability oil reservoir through multiple water injection and soaking treatments, can realize the pushing of oil to adjacent oil wells in the process of handling, exerts the advantages of imbibition oil extraction, can clearly observe the imbibition oil extraction efficiency under different conditions by setting a plurality of comparison experiments in the process of simulating the low-permeability oil extraction experiment, can conveniently apply the imbibition oil extraction efficiency to the actual oil extraction process according to the result of the simulation experiment so as to improve the efficiency in the actual oil extraction, can also be compared by the experiments in the process of simulating the experiments, can clearly observe the experimental process, and can also ensure the accuracy of the experimental result, the value of the experiment is improved.
Description
Technical Field
The invention belongs to the technical field of oil reservoir development, and particularly relates to a imbibition oil production method and a laboratory simulation method suitable for a low-permeability oil reservoir.
Background
Imbibition oil recovery is a process of utilizing or limiting capillary force, and is an oil recovery method or technology of utilizing a chemical imbibition agent to change the wettability of the pore surfaces of rocks, promote or enhance the imbibition process, reduce capillary resistance, and improve injectivity and recovery efficiency. The oil extraction technology is especially significant for oil reservoirs with ultra-low permeability and ultra-low permeability (the permeability is below 10 mD). The oil reservoir faces the difficult problems of huge exploitation difficulty and low recovery rate, and the large reserve is a practical problem which must be faced and solved by the operators. The seepage oil extraction technology is slower to develop in China and has less application.
The existing oil extraction method applied to the low-permeability oil reservoir has low oil extraction efficiency in the low-permeability oil extraction process, and in the laboratory simulation process before oil extraction, the existing experimental simulation method has few comparison experiments, so that the data accuracy in the simulation process is low, and the deviation in the practical application process is large.
Disclosure of Invention
The invention aims to provide a imbibition oil production method and a laboratory simulation method suitable for a low-permeability reservoir, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: an imbibition oil production method suitable for a low-permeability reservoir comprises the following steps:
s1, firstly, arranging horizontal wells including a huff-puff well and a production well in a low-permeability area for producing the oil deposit, and arranging the huff-puff well and the production well side by side;
s2, performing volume fracturing reservoir transformation on the huff-puff well and the oil production well, adjusting the pressure of the huff-puff well and the oil production well, and improving the formation pressure around the huff-puff well;
s3, injecting water into the oil production well and the huff-and-puff well, and stopping injecting water when the pressure at the end of the injection period is equal to the original formation pressure
And S4, injecting an imbibition agent into the stratum after water injection, closing the well after injection, starting the oil reservoir huffing and puff process, entering soaking, opening the well for water injection again after soaking is completed, enabling the pressure of the huffing and puff bottom well to reach the preset pressure and be less than the stratum saturation pressure, starting imbibition oil production, continuing water injection and soaking when the pressure is less than the preset pressure, and continuing 3-5 times to finish the whole imbibition oil production.
Further, in S1, the huff-and-puff wells and the production wells are arranged at intervals, and in S2, the average fracturing construction displacement of the oil wells subjected to volume fracturing modification>5m3Min, mean interval between fracture sections 7595m and when the pressure around the well is regulated, the water injection is stopped when the pressure remains 100% of the level.
Further, in S3 and S4, the average speed of water injection is maintained at 0.2 to 2 m/day and the average speed of injection of the imbibition agent is maintained at 0.5 to 1.8 m/day when water is injected into the well, and the water injection rate is calculated as the cumulative water injection rate for one throughout period when the pressure retention level rises from the low level before the throughout to the same pressure as the original formation pressure during the water injection.
Further, in S4, the time for carrying out first soaking is controlled to be 10-25 hours, and in the process of handling the oil deposit horizontal well, the soaking time is 5-25 days.
A laboratory simulation method suitable for a low-permeability reservoir comprises the following steps:
a, putting a rock core into a seepage container, and then putting the seepage container into a constant temperature box with an observation window and monitoring equipment;
b, attaching and fixing the graduated scale to the inner wall of the infiltration container, filling the infiltration container with the infiltration medium, and reading the primary mark of the infiltration medium on the graduated scale after the infiltration medium is completely filled;
c, one group adjusts the temperature in the thermostat during imbibition and keeps the pressure unchanged, and the other group adjusts the pressure in the thermostat during imbibition through a pressure pump and keeps the temperature unchanged, records the marks of the imbibition medium on the graduated scale under different pressures and different temperatures, and stops metering until the imbibition medium is stable and unchanged;
and D, respectively taking the metering result and the time as X-axis and Y-axis fluctuation curves of data, and determining the temperature and the pressure when the imbibition recovery rate is highest according to the fluctuation curves.
Further, in step A, the infiltration suction container and the thermostat are not less than two groups, the temperature in the thermostat is controlled on the stratum temperature surface, the monitoring equipment comprises a 360-degree dead-angle-free monitoring camera and a monitoring display screen connected with the camera, and the monitoring display screen is arranged outside the thermostat.
And further, in the step C, when the temperature in the constant temperature box is adjusted, the temperature is increased by plus or minus 0.5 ℃ every half hour, and when the pressure is adjusted, the temperature is increased by plus or minus 0.5MPa every half hour.
Still further, in step C, the metering was stopped when the imbibition solution at the scale was not changing within 2 hours.
The invention has the technical effects and advantages that: the imbibition oil extraction method and the laboratory simulation method suitable for the low-permeability reservoir can effectively improve the oil extraction efficiency by carrying out multiple water injection and soaking treatments and then carrying out imbibition oil extraction on the low-permeability reservoir, and can push oil to adjacent oil wells in the process of handling, exert the advantages of imbibition oil recovery, meanwhile, in the process of simulating the low-permeability oil production experiment, the single variable and fixed conditions of the experiment are determined by setting a plurality of comparison experiments, so that the seepage and oil production efficiency under different conditions can be clearly observed, further, the oil recovery device can be conveniently applied to the actual oil recovery process according to the result of the simulation experiment so as to improve the efficiency during the actual oil recovery, in the process of the simulation experiment, the accuracy of the experiment result can be ensured and the experiment value is improved by comparing a plurality of experiments and clearly observing the experiment process in the experiment.
Detailed Description
The technical solutions in the present disclosure will be clearly and completely described below with reference to the present disclosure, and it is obvious that the described contents are only a part of the present disclosure, and not all of the present disclosure. All other matters which can be obtained by a person skilled in the art without making creative efforts based on the contents of the present invention belong to the protection scope of the present invention.
The invention provides a imbibition oil production method suitable for a low-permeability reservoir and a laboratory simulation method, which comprise the following steps:
s1, firstly, arranging horizontal wells including a huff-puff well and a production well in a low-permeability area for producing the oil deposit, and arranging the huff-puff well and the production well side by side;
s2, performing volume fracturing reservoir transformation on the huff-puff well and the oil production well, adjusting the pressure of the huff-puff well and the oil production well, and improving the formation pressure around the huff-puff well;
s3, injecting water into the oil production well and the huff-and-puff well, and stopping injecting water when the pressure at the end of the injection period is equal to the original formation pressure
And S4, injecting an imbibition agent into the stratum after water injection, closing the well after injection, starting the oil reservoir huffing and puff process, entering soaking, opening the well for water injection again after soaking is completed, enabling the pressure of the huffing and puff bottom well to reach the preset pressure and be less than the stratum saturation pressure, starting imbibition oil production, continuing water injection and soaking when the pressure is less than the preset pressure, and continuing 3-5 times to finish the whole imbibition oil production.
A laboratory simulation method suitable for a low-permeability reservoir comprises the following steps:
a, putting a rock core into a seepage container, and then putting the seepage container into a constant temperature box with an observation window and monitoring equipment;
b, attaching and fixing the graduated scale to the inner wall of the infiltration container, filling the infiltration container with the infiltration medium, and reading the primary mark of the infiltration medium on the graduated scale after the infiltration medium is completely filled;
c, one group adjusts the temperature in the thermostat during imbibition and keeps the pressure unchanged, and the other group adjusts the pressure in the thermostat during imbibition through a pressure pump and keeps the temperature unchanged, records the marks of the imbibition medium on the graduated scale under different pressures and different temperatures, and stops metering until the imbibition medium is stable and unchanged;
and D, respectively taking the metering result and the time as X-axis and Y-axis fluctuation curves of data, and determining the temperature and the pressure when the imbibition recovery rate is highest according to the fluctuation curves.
Example 1
In S1, the huff-puff wells and the oil production wells are arranged at intervals, in S2, the oil wells subjected to volume fracturing transformation have the average fracturing construction displacement of 5m3Min, average frac interval 75m, and stopping water injection when pressure is maintained at 100% of the level while adjusting the pressure around the well.
At S3 and S4, the average speed of water injection is maintained at 0.2 m/day and the average speed of injection of the imbibition agent is maintained at 0.5 m/day when water is injected into the well, and during the water injection, the water injection amount is the cumulative water injection amount for one throughput period calculated when the pressure retention level rises from the low level before the throughput to the same as the virgin formation pressure.
And S4, controlling the time for carrying out first soaking to be 10 hours, and controlling the soaking time to be 5 days in the process of handling the oil deposit horizontal well.
In the step A, the infiltration absorption container and the constant temperature box are not less than two groups, the temperature in the constant temperature box is controlled on the stratum temperature surface, the monitoring equipment comprises a 360-degree dead-angle-free monitoring camera and a monitoring display screen connected with the camera, and the monitoring display screen is arranged outside the constant temperature box.
And C, when the temperature in the constant temperature box is adjusted, increasing +/-0.5 ℃ every half hour, and when the pressure is adjusted, increasing +/-0.5 MPa every half hour.
And C, stopping metering when the imbibition solution at the graduated scale is not changed within 2 hours.
Example 2
S1, setting the huff-puff wells and the production wells at intervals, and S2, carrying out volume fracturing transformation on the oil wells, wherein the average fracturing construction displacement is>8m3Min, average frac interval 85m, and stopping water injection when pressure is maintained at 100% of the level while adjusting the pressure around the well.
At S3 and S4, the average speed of water injection is maintained at 1.2 m/day and the average speed of injection of the imbibition agent is maintained at 1.1 m/day when water is injected into the well, and during the water injection, the water injection amount is the cumulative water injection amount for one throughout period calculated when the pressure retention level rises from the low level before throughout to the same pressure as the virgin formation.
And S4, controlling the time for carrying out first soaking to be 18 hours, and controlling the soaking time to be 15 days in the process of handling the oil deposit horizontal well.
In the step A, the infiltration absorption container and the constant temperature box are not less than two groups, the temperature in the constant temperature box is controlled on the stratum temperature surface, the monitoring equipment comprises a 360-degree dead-angle-free monitoring camera and a monitoring display screen connected with the camera, and the monitoring display screen is arranged outside the constant temperature box.
And C, when the temperature in the constant temperature box is adjusted, increasing +/-0.5 ℃ every half hour, and when the pressure is adjusted, increasing +/-0.5 MPa every half hour.
And C, stopping metering when the imbibition solution at the graduated scale is not changed within 2 hours.
Example 3
S1, setting the huff-puff wells and the production wells at intervals, and S2, carrying out volume fracturing transformation on the oil wells, wherein the average fracturing construction displacement is>10m3Min, mean frac interval 95m, and stop flooding when pressure is maintained 100% of the level while adjusting the pressure around the well.
At S3 and S4, the average speed of water injection is maintained at 2 m/day, the average speed of injection of the imbibition agent is 1.8 m/day, and the water injection amount is calculated as the cumulative water injection amount for one throughout period when the pressure retention level rises from the low level before throughout to the same as the original formation pressure during the water injection.
And S4, controlling the soaking time for the first time to be 25 hours, and controlling the soaking time to be 25 days in the process of handling the oil deposit horizontal well.
In the step A, the infiltration absorption container and the constant temperature box are not less than two groups, the temperature in the constant temperature box is controlled on the stratum temperature surface, the monitoring equipment comprises a 360-degree dead-angle-free monitoring camera and a monitoring display screen connected with the camera, and the monitoring display screen is arranged outside the constant temperature box.
And C, when the temperature in the constant temperature box is adjusted, increasing +/-0.5 ℃ every half hour, and when the pressure is adjusted, increasing +/-0.5 MPa every half hour.
And C, stopping metering when the imbibition solution at the graduated scale is not changed within 2 hours.
From comparative experiments 1-3, it can be seen from the results obtained in the comparative experiments that the average fracturing construction displacement is used as the average fracturing construction displacement in example 2>8m3And/min, the average interval of the fracturing sections is 85m, the average speed of water injection is maintained at 1.2 m/day, and when the average speed of the injection of the imbibition agent is 1.1 m/day, the imbibition oil recovery effect is better.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing description, it will be apparent to one skilled in the art that various changes, modifications, equivalents, and improvements may be made without departing from the spirit and scope of the invention.
Claims (8)
1. The imbibition oil production method suitable for the low-permeability reservoir is characterized by comprising the following steps of:
s1, firstly, arranging horizontal wells including a huff-puff well and a production well in a low-permeability area for producing the oil deposit, and arranging the huff-puff well and the production well side by side;
s2, performing volume fracturing reservoir transformation on the huff-puff well and the oil production well, adjusting the pressure of the huff-puff well and the oil production well, and improving the formation pressure around the huff-puff well;
s3, injecting water into the oil production well and the huff-and-puff well, and stopping injecting water when the pressure at the end of the injection period is equal to the original formation pressure
And S4, injecting an imbibition agent into the stratum after water injection, closing the well after injection, starting the oil reservoir huffing and puff process, entering soaking, opening the well for water injection again after soaking is completed, enabling the pressure of the huffing and puff bottom well to reach the preset pressure and be less than the stratum saturation pressure, starting imbibition oil production, continuing water injection and soaking when the pressure is less than the preset pressure, and continuing 3-5 times to finish the whole imbibition oil production.
2. The imbibition oil recovery method suitable for the low-permeability reservoir as claimed in claim 1, wherein: s1, setting the huff-puff wells and the production wells at intervals, and S2, carrying out volume fracturing transformation on the oil wells, wherein the average fracturing construction displacement is>5m3And/min, the average interval of the fracturing sections is 75-95 m, and when the pressure around the well is regulated, the water injection is stopped when the pressure is kept at 100% of the horizontal level.
3. The imbibition oil recovery method suitable for the low-permeability reservoir as claimed in claim 1, wherein: and S3 and S4, when water is injected into the well, the average speed of the injected water is maintained at 0.2-2 m/day, the average speed of the injected imbibition agent is 0.5-1.8 m/day, and in the water injection process, the water injection quantity is the accumulated water injection quantity of one throughout period, wherein the accumulated water injection quantity is calculated when the pressure maintaining level is increased from the low level before throughout to the same pressure as the original stratum pressure.
4. The imbibition oil recovery method suitable for the low-permeability reservoir as claimed in claim 1, wherein: and S4, controlling the time for carrying out first soaking within 10-25 hours, and controlling the soaking time within 5-25 days in the handling process of the oil reservoir horizontal well.
5. A laboratory simulation method suitable for a low-permeability reservoir is characterized by comprising the following steps:
a, putting a rock core into a seepage container, and then putting the seepage container into a constant temperature box with an observation window and monitoring equipment;
b, attaching and fixing the graduated scale to the inner wall of the infiltration container, filling the infiltration container with the infiltration medium, and reading the primary mark of the infiltration medium on the graduated scale after the infiltration medium is completely filled;
c, one group adjusts the temperature in the thermostat during imbibition and keeps the pressure unchanged, and the other group adjusts the pressure in the thermostat during imbibition through a pressure pump and keeps the temperature unchanged, records the marks of the imbibition medium on the graduated scale under different pressures and different temperatures, and stops metering until the imbibition medium is stable and unchanged;
and D, respectively taking the metering result and the time as X-axis and Y-axis fluctuation curves of data, and determining the temperature and the pressure when the imbibition recovery rate is highest according to the fluctuation curves.
6. The laboratory simulation method for a low-permeability reservoir of claim 5, wherein: in the step A, the infiltration absorption container and the constant temperature box are not less than two groups, the temperature in the constant temperature box is controlled on the stratum temperature surface, the monitoring equipment comprises a 360-degree dead-angle-free monitoring camera and a monitoring display screen connected with the camera, and the monitoring display screen is arranged outside the constant temperature box.
7. The laboratory simulation method for a low-permeability reservoir of claim 6, wherein: and C, when the temperature in the constant temperature box is adjusted, increasing +/-0.5 ℃ every half hour, and when the pressure is adjusted, increasing +/-0.5 MPa every half hour.
8. The laboratory simulation method for a low-permeability reservoir of claim 6, wherein: and C, stopping metering when the imbibition solution at the graduated scale is not changed within 2 hours.
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| CN113250662B (en) | 2023-01-06 |
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