CN109296363A - Extra-low permeability oil reservoirs CO2Drive initial productivity prediction technique - Google Patents
Extra-low permeability oil reservoirs CO2Drive initial productivity prediction technique Download PDFInfo
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- 241000209094 Oryza Species 0.000 claims abstract description 26
- 235000007164 Oryza sativa Nutrition 0.000 claims abstract description 26
- 235000009566 rice Nutrition 0.000 claims abstract description 26
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- 239000003921 oil Substances 0.000 claims description 126
- 238000004519 manufacturing process Methods 0.000 claims description 62
- 238000011084 recovery Methods 0.000 claims description 39
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- 230000015572 biosynthetic process Effects 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 239000003129 oil well Substances 0.000 claims description 13
- 238000006073 displacement reaction Methods 0.000 claims description 12
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- 238000009530 blood pressure measurement Methods 0.000 claims description 6
- 239000010779 crude oil Substances 0.000 claims description 4
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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
- 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
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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
- E21B43/164—Injecting CO2 or carbonated water
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Abstract
The present invention provides a kind of extra-low permeability oil reservoirs CO2Drive initial productivity prediction technique, extra-low permeability oil reservoirs CO2Driving initial productivity prediction technique includes: step 1, for the CO having been carried out2Mixed phase drive block, calculate its elastic development initial stage, elastic development latter stage, mixed phase drive exploitation early period, mixed phase drive exploitation stationary phase zero dimension rice productivity index；Step 2, target block CO is calculated2Drive initial stage rice productivity index；Step 3, the producing pressure differential Δ P of target block is calculated；Step 4, the core intersection h of target block is determined；And step 5 calculates target block CO according to deliverability calculation2Drive initial productivity.Extra-low permeability oil reservoirs CO2Drive initial productivity prediction technique is extra-low permeability oil reservoirs CO2The establishment of oil reservoirs engineering proposal provides the determination method of key technology policy, instructs CO2The establishment of oil reservoirs engineering proposal.
Description
Technical Field
The invention relates to CO2The technical field of improving the oil recovery ratio by flooding, in particular to ultra-low permeability reservoir CO2A method for predicting the initial productivity of a drive.
Background
The domestic ultra-low permeability oil reservoir has large resource amount, and the oil reservoir becomes a main battlefield for oil development. However, the effective development difficulty of the ultra-low permeability reservoir is large, the elastic development recovery ratio is low, and the water injection development injection is difficult. Supercritical CO2Due to the characteristics of low viscosity, strong miscibility with crude oil and the like, the recovery ratio of the ultra-low permeability reservoir can be greatly improved.
In the preparation of CO2In the course of reservoir flooding engineering projects, CO2Capacity prediction at drive-start is important, but often difficult to determine. Current calculation of CO2The method for driving initial capacity comprises the following steps: a reservoir engineering calculation method, a numerical simulation method and the like. Reservoir engineering calculation methods are of many kinds, but most of the methods are based on theoryThe calculated result of the theory model has larger error compared with the actual result of the mine. The numerical simulation method must be based on historical fitting to obtain reliable results, and is poor in applicability for initial capacity prediction. Therefore, based on actual test data of a mine field, the invention provides the ultra-low permeability reservoir CO2The method for predicting the capacity at the initial stage of flooding solves the technical problems.
Disclosure of Invention
The invention aims to provide a guide CO2Ultra-low permeability reservoir CO compiled by reservoir flooding engineering scheme2A method for predicting the initial productivity of a drive.
The object of the invention can be achieved by the following technical measures: ultra-low permeability reservoir CO2 flooding initial productivity prediction method2The method for predicting the capacity at the initial flooding stage comprises the following steps: step 1, for implemented CO2The miscible flooding block is used for calculating the dimensionless rice oil recovery index of the initial stage of elastic development, the final stage of elastic development, the early stage of miscible flooding development and the stable stage of miscible flooding development; step 2, calculating a target block CO2Oil recovery index of rice at the initial flooding stage; step 3, calculating the production pressure difference delta P of the target block; step 4, determining the oil layer thickness h of the target block; and step 5, calculating the target block CO according to the productivity calculation formula2And (4) driving the initial production capacity.
The object of the invention can also be achieved by the following technical measures:
in step 1, CO has been carried out2The miscible flooding block meets the following conditions, namely, the block belongs to an ultra-low permeability oil reservoir; secondly, elastic development is firstly carried out in block production, so that the formation pressure is reduced to be lower than miscible phase pressure; third, block CO injection2Recovering the formation pressure to above miscible pressure, and then implementing CO2And (4) miscible phase driving.
In step 1, the initial stage of elasticity development refers to 1-2 months after the block elasticity development and delivery; the end of elasticity development refers to the end of elasticity development,1-2 months before the development mode is converted; by injection of CO2After formation pressure is restored, CO is initially applied2In 1-2 months of miscible flooding, the oil well yield is higher, but the yield is in a descending trend, after the period of time, the oil well yield tends to be stable and keeps 1-2 years, the period of time is called a stable yield period, the oil well yield decreases year by year as the gas-oil ratio increases at the later stage, and the earlier stage of miscible flooding is that CO is just implemented21-2 months of miscible flooding, and the miscible flooding development stable period refers to a stable production period of 1-2 years when the oil well yield tends to be stable.
In step 1, CO has been carried out2The non-dimensional meter oil extraction index calculation formula of the mixed-phase flooding block in the initial stage of elastic development, the final stage of elastic development, the early stage of mixed-phase flooding development and the stable stage of mixed-phase flooding development is as follows:
in the formula, the superscript represents the block type, and the subscript represents different periods; the meaning of a specific symbol is expressed as follows,implemented CO2The dimensionless meter oil extraction index is not used at the initial stage of the elastic development of the miscible flooding block;implemented CO2Elastic development of an initial meter oil extraction index of the miscible flooding block;implemented CO2The non-dimensional oil extraction index at the last stage of the elastic development of the miscible flooding block;implemented CO2The elastic development of the miscible flooding block is carried out on the last-stage meter oil extraction index;implemented CO2The non-dimensional oil extraction index is obtained in the early stage of miscible flooding development of the miscible flooding block;implemented CO2Miscible flooding block miscible flooding exploitation early-stage rice oil production index;implemented CO2A miscible flooding block is used for developing a dimensionless oil extraction index in a stable period of miscible flooding;implemented CO2Miscible flooding block miscible flooding development stable-period Mi oil extraction index.
In step 1, CO has been carried out2And the rice oil recovery indexes of the miscible flooding block in four periods are obtained by selecting dynamic data and pressure measurement data of 1-2 months in each period.
In step 2, the target block CO2Initial-flooding-rice-oil-production-index passing through implemented CO2And calculating the dimensionless rice oil production index of the miscible flooding block in four periods and the initial rice oil production index of the target block in the elastic development period.
In step 2, the target block is elastically developed to obtain the initial meter oil recovery indexCalculating and obtaining the test oil and test production data and the initial pressure measurement data;
target block miscible flooding development early-stage meter oil production indexExpressed as:
mi oil production index of target block in miscible flooding stable periodExpressed as:
target Block CO2 flooding initial Meter oil recovery indexExpressed as:
in the formula, t1Implemented CO2The duration of the early stage of miscible flooding development of the miscible flooding block is month; t is t2Implemented CO2Part of the duration of the miscible flooding stable period of the miscible flooding block is month;
CO2CO is often referred to at the beginning of flooding2The first year after the drive is put into production, there are therefore:
t1+t2＝12 (8)。
in step 2, when the target block is developed flexiblyCO calculated by equation (7) is required to have different water contents at the initial stage and the initial stage of miscible flooding2Correcting the oil extraction index of the oil displacement initial meter, correcting and calculating the corrected CO through a target block ratio oil extraction index curve2Oil recovery index of early-stage oil displacement meterExpressed as:
in the formula, βfw1Specific oil recovery index at initial water cut fw1 of miscible flooding development, βfw2Specific oil recovery index at elastic development initial water cut fw 2.
In step 3, the target zone produces a differential pressure Δ P, via the bottom hole flow pressure PwfFormation pressure PiAnd (3) calculating:
ΔP＝Pi-Pwf(10)
the calculation formula for the bottom hole flow pressure used to calculate the production pressure differential is:
in the formula, H is the depth in the oil reservoir, L is the pumping depth,density of liquid-gas mixture, hs-the degree of sinking of the steel sheet,crude oil density, pc-a casing pressure;
the formation pressure used to calculate the production drawdown should be equal to the current reservoir mean pressure.
In step 4, the target block reservoir thickness should be the reservoir average reservoir thickness h.
In step 5, the target block CO2The driving initial capacity q is represented by the following calculation formula:
wherein,for corrected CO2Oil recovery index of early-stage oil displacement meter.
Ultra-low permeability reservoir CO in the present invention2The method for predicting the capacity at the initial flooding stage solves the problem of CO2And the early-stage capacity prediction process is complicated, and the prediction result is inaccurate. By applying the method, the CO can be treated2The initial capacity of flooding is simply and accurately predicted to be the ultra-low permeability reservoir CO2Determining method for providing key technical policy for reservoir driving engineering scheme compilation and guiding CO2And (5) compiling an oil displacement project.
Drawings
FIG. 1 is a view of ultra-low permeability reservoir CO of the present invention2A flowchart of an embodiment of a method for forecasting drive to initial capacity.
Detailed Description
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
FIG. 1 is a diagram of the ultra-low permeability reservoir CO of the present invention, as shown in FIG. 12A flow chart of the method for predicting the initial capacity.
Step 101, for implemented CO2Miscible driving block, computingThe non-dimensional rice oil production index of the initial stage of elastic development, the final stage of elastic development, the early stage of miscible flooding development and the stable stage of miscible flooding development is implemented2The miscible flooding block should meet the following conditions, namely, the block belongs to an ultra-low permeability oil reservoir; secondly, elastic development is firstly carried out in block production, so that the formation pressure is reduced to be lower than miscible phase pressure; third, block CO injection2Recovering the formation pressure to above miscible pressure, and then implementing CO2And (4) miscible phase driving.
The initial stage of elasticity development refers to a short production time (1-2 months) after patch elasticity development and delivery. The final stage of the elastic development refers to a short production time (1-2 months) before the development mode is converted and the later stage of the elastic development is about to end. By injection of CO2After formation pressure is restored, CO is initially applied2The oil well yield is higher in a short production time (1-2 months) of miscible flooding, but the yield is in a descending trend, after the time, the oil well yield tends to be stable and is kept for a longer time (1-2 years), the time is often called as a 'stable production period', and the oil well yield is gradually reduced year by year as the gas-oil ratio is increased at the later stage. The early stage of miscible flooding development refers to the beginning of CO implementation2A short production time of miscible flooding. The miscible flooding development stable period refers to a stable production period when the oil well yield tends to be stable.
Implemented CO2The dimensionless rice oil recovery index at the initial stage of the elastic development, the final stage of the elastic development, the early stage of the miscible flooding development, and the stable stage of the miscible flooding development (hereinafter referred to as "four stages") can be obtained by dividing the rice oil recovery index at the four stages by the rice oil recovery index at the initial stage of the elastic development (formulas 1 to 4).
In the formula, the superscript represents the block type and the subscript represents the different time periods. The meaning of a specific symbol is expressed as follows,implemented CO2The dimensionless meter oil extraction index is not used at the initial stage of the elastic development of the miscible flooding block;implemented CO2Elastic development of an initial meter oil extraction index of the miscible flooding block;implemented CO2The non-dimensional oil extraction index at the last stage of the elastic development of the miscible flooding block;implemented CO2The elastic development of the miscible flooding block is carried out on the last-stage meter oil extraction index;implemented CO2The initial stage of miscible flooding development of the miscible flooding block has no dimension meter oil extraction index;implemented CO2Miscible flooding block miscible flooding exploitation early-stage rice oil production index;implemented CO2A miscible flooding block is used for developing a dimensionless oil extraction index in a stable period of miscible flooding;implemented CO2Miscible flooding block miscible flooding development stable-period Mi oil extraction index.
Implemented CO2The Mi oil recovery index of the miscible flooding block in four periods can be obtained by selecting dynamic data and pressure measurement data of a small production time (1-2 months) in each period.
Step 102, calculating a target block CO2Oil recovery index of rice at the initial flooding stage;
target block CO2The initial oil-producing rate can be measured by the CO2And calculating the dimensionless rice oil production index of the miscible flooding block in four periods and the initial rice oil production index of the target block in the elastic development period.
Target block elastic development initial meter oil production indexThe method can be obtained by calculating the test oil and test production data and the initial pressure measurement data.
Target block miscible flooding development early-stage meter oil production indexCan be expressed as:
mi oil production index of target block in miscible flooding stable periodCan be expressed as:
target block CO2Oil recovery index of early-stage oil displacement meterCan be expressed as:
in the formula, t1Implemented CO2The duration of the early stage of miscible flooding development of the miscible flooding block is month; t is t2Implemented CO2And the duration of the miscible flooding block is part of the duration of the miscible flooding stable period.
CO2CO is often referred to at the beginning of flooding2The first year after the drive is put into production, there are therefore:
t1+t2＝12 (8)
if the initial water content of the target block elastic development is different from that of the miscible flooding development, the CO calculated by the formula (7) is required2Correcting the oil extraction index of the oil displacement initial meter, correcting and calculating the corrected CO through a target block ratio oil extraction index curve2Oil recovery index of early-stage oil displacement meterExpressed as:
in the formula, βfw1Specific oil recovery index at initial water cut fw1 of miscible flooding development, βfw2Specific oil recovery index at elastic development initial water cut fw 2.
Step 103, calculating the production pressure difference of the target block;
the target block production pressure difference delta P can be obtained through the bottom hole flow pressure PwfFormation pressure PiAnd (10) calculating.
ΔP＝Pi-Pwf(10)
The bottom hole flow pressure used to calculate the production differential pressure can be calculated by equation (11).
In the formula, H is the depth in the oil reservoir, L is the pumping depth,-density of the liquid-gas mixture, hs-degree of sinking,crude oil density, pc-register pressure.
The formation pressure used to calculate the production drawdown should be equal to the current reservoir mean pressure.
Step 104, determining the oil layer thickness of the target block; and the thickness of the oil layer of the target block is the average thickness h of the oil layer of the oil reservoir.
105, calculating a target block CO according to a capacity calculation formula2And (4) driving the initial production capacity. Target block CO2The driving initial capacity q is represented by the following calculation formula:
in one embodiment of the present invention, the method comprises the following steps:
in step 1, according to the CO already implemented2And calculating the dimensionless rice oil production index of the miscible flooding block at the rice oil production indexes of four periods.
The victory oil field develops CO in the fan 142 block2The pilot test of driving, the block 142 permeability is 1mD, belongs to the ultra-low permeability oil reservoir, and the large-scale fracturing elastic development in the early stage of the block causes the formation pressure from the initial stage of the elastic development43MPa to 17MPa at the end of elasticity development to CO2Miscible flooding, injecting CO into the block2And recovering the formation energy, and opening two ports of the oil well for trial production when the pressure is recovered to be higher than the miscible phase pressure. The four-period meter production index of the fan 142 block was calculated according to the early development and the miscible flooding pilot production (tables 1 to 4). The non-dimensional rice-oil-production index (table 5) of the fan 142 was calculated from the expressions (1) to (4).
TABLE 1F 142 Meter oil recovery index (initial stage of elastic development)
TABLE 2F 142 Block-meter oil-recovery index (elastic development end) calculation table
TABLE 3F 142 Meter oil-recovery index (miscible flooding early stage) calculation Table
TABLE 4F 142 Meter oil-recovery index (miscible flooding development stability period) calculation table
TABLE 5F 142 Block-meter oil-production index statistical table
In step 2, by means of the CO already carried out2Calculating CO of the target block by using the dimensionless rice oil production index of the miscible flooding block in four periods and the initial rice oil production index of the target block in elastic development2Oil recovery index of early-stage oil displacement meter.
The target block is a quotient 853 block, the reservoir permeability of the target block is 4mD, and the target block belongs to an ultra-low permeability reservoir. And determining that the initial meter oil recovery index is 0.045t/d.MPa.m and the initial production water content of a commercial 853 block is 44% according to the test oil and production data of the block. And calculating the Mi oil recovery index (table 6) of the 853 blocks of miscible flooding prophase and miscible flooding stable period according to the formula (5) and the formula (6). From Table 3, the CO that is known to be implemented2The duration of the early stage of miscible flooding development of the miscible flooding block is about 2 months, namely t1When t is 2, t is known from formula (8)210. The quotient 853 block CO is calculated according to equation (7)2The oil recovery index of the early-stage flooding meter is 0.042t/d.MPa.m (water content is 44%). According to the quotient 853 oil-water phase permeability curve, the specific oil extraction index curve can be calculated, and then according to the formula (9), the quotient 853 CO with the water content of 50% at present can be calculated2The oil recovery index of the early-stage flooding rice is 0.023 t/d.MPa.m.
TABLE 6 quotient 853 meter oil-production index calculation table
And 3, calculating the production pressure difference of the target block through the bottom hole flowing pressure and the formation pressure.
According to the formula (11), the bottom hole flowing pressure of the quotient 853 block is calculated to be 12MPa, the reasonable pressure maintaining level of the quotient 853 block is referred to, the average formation pressure of the quotient 853 block is determined to be 33.2MPa, and the production pressure difference of the quotient 853 block is calculated to be 21.2MPa according to the formula (10).
At step 4, the quotient 853 piece average oil layer thickness was determined to be 9.5 m.
At step 5, the quotient 853 block CO is calculated according to equation (12)2The initial capacity (Table 7) was 4.6 t/d.
TABLE 7 quotient 853 CO2Driving initial productivity calculation table
Claims (11)
1. Ultra-low permeability reservoir CO2The method for predicting the capacity at the initial flooding stage is characterized in that the ultra-low permeability reservoir CO is2The method for predicting the capacity at the initial flooding stage comprises the following steps:
step 1, for implemented CO2The miscible flooding block is used for calculating the dimensionless rice oil recovery index of the initial stage of elastic development, the final stage of elastic development, the early stage of miscible flooding development and the stable stage of miscible flooding development;
step 2, calculating a target block CO2Oil recovery index of rice at the initial flooding stage;
step 3, calculating the production pressure difference delta P of the target block;
step 4, determining the oil layer thickness h of the target block; and
step 5, calculating the target block CO according to the productivity calculation formula2And (4) driving the initial production capacity.
2. The ultra-low permeability reservoir CO of claim 12The method for predicting the initial capacity is characterized in that, in step 1, CO is performed2The miscible flooding block meets the following conditions, namely, the block belongs to an ultra-low permeability oil reservoir; secondly, elastic development is firstly carried out on the block, so that the formation pressure is reduced to be lower than the miscible pressure; third, block CO injection2Recovering the formation pressure to above miscible pressure, and then implementing CO2And (4) miscible phase driving.
3. The ultra-low permeability reservoir CO of claim 12The method for predicting the capacity at the initial flooding stage is characterized in that in the step 1, the initial elastic development stage refers to 1-2 months after block elastic development and delivery; the final stage of the elastic development refers to 1-2 months before the elastic development is finished and the development mode is converted; by injection of CO2After formation pressure is restored, CO is initially applied2In 1-2 months of miscible flooding, the oil well yield is higher, but the yield is in a descending trend, after the period of time, the oil well yield tends to be stable and keeps 1-2 years, the period of time is called a stable yield period, the oil well yield decreases year by year as the gas-oil ratio increases at the later stage, and the earlier stage of miscible flooding is that CO is just implemented21-2 months of miscible flooding, and the miscible flooding development stable period refers to a stable production period of 1-2 years when the oil well yield tends to be stable.
4. The ultra-low permeability reservoir CO of claim 12The method for predicting the initial capacity is characterized in that, in step 1, CO is performed2The non-dimensional meter oil extraction index calculation formula of the mixed-phase flooding block in the initial stage of elastic development, the final stage of elastic development, the early stage of mixed-phase flooding development and the stable stage of mixed-phase flooding development is as follows:
in the formula, the superscript represents the block type, and the subscript represents different periods; the meaning of a specific symbol is expressed as follows,implemented CO2The dimensionless meter oil extraction index is not used at the initial stage of the elastic development of the miscible flooding block;implemented CO2Elastic development of an initial meter oil extraction index of the miscible flooding block;implemented CO2The non-dimensional oil extraction index at the last stage of the elastic development of the miscible flooding block;implemented CO2The elastic development of the miscible flooding block is carried out on the last-stage meter oil extraction index;implemented CO2The non-dimensional oil extraction index is obtained in the early stage of miscible flooding development of the miscible flooding block;implemented CO2Miscible flooding block miscible flooding exploitation early-stage rice oil production index;implemented CO2A miscible flooding block is used for developing a dimensionless oil extraction index in a stable period of miscible flooding;implemented CO2Miscible flooding block miscible flooding development stable-period Mi oil extraction index.
5. The ultra-low permeability reservoir CO of claim 42The method for predicting the initial capacity is characterized in that, in step 1, CO is performed2The dimensionless meter oil recovery indexes of the miscible flooding block in four periods are obtained by selecting dynamic data and pressure measurement data of 1-2 months in each period.
6. The ultra-low permeability reservoir CO of claim 42The method for predicting the initial capacity is characterized in that in step 2, the target block CO2Initial-flooding-rice-oil-production-index passing through implemented CO2And calculating the dimensionless rice oil production index of the miscible flooding block in four periods and the initial rice oil production index of the target block in the elastic development period.
7. The ultra-low permeability reservoir CO of claim 62The method for predicting the initial capacity of flooding is characterized in that in step 2, the target block develops the initial meter oil recovery index flexiblyCalculating and obtaining the test oil and test production data and the initial pressure measurement data;
target block miscible flooding development early-stage meter oil production indexExpressed as:
mi oil production index of target block in miscible flooding stable periodExpressed as:
target block CO2Oil recovery index of early-stage oil displacement meterExpressed as:
in the formula, t1Implemented CO2The duration of the early stage of miscible flooding development of the miscible flooding block is month; t is t2Implemented CO2Part of the duration of the miscible flooding stable period of the miscible flooding block is month;
CO2CO is often referred to at the beginning of flooding2The first year after the drive is put into production, there are therefore:
t1+t2＝12 (8)。
8. the ultra-low permeability reservoir CO of claim 72The method for predicting the capacity in the initial flooding stage is characterized in that in step 2, when the water content of the target block in the initial elastic development stage is different from that of the target block in the initial miscible flooding stage, the CO calculated by the formula (7) is required2Correcting the oil extraction index of the oil displacement initial meter, correcting and calculating the corrected CO through a target block ratio oil extraction index curve2Oil recovery index of early-stage oil displacement meterExpressed as:
in the formula, βfw1Specific oil recovery index at initial water cut fw1 of miscible flooding development, βfw2Specific oil recovery index at elastic development initial water cut fw 2.
9. The ultra-low permeability reservoir CO of claim 12The method for predicting the initial productivity is characterized in that, in step 3, the target block production pressure difference delta P passes through the bottom hole flowing pressure PwfFormation pressure PiAnd (3) calculating:
ΔP＝Pi-Pwf(10)
the calculation formula for the bottom hole flow pressure used to calculate the production pressure differential is:
in the formula, H is the depth in the oil reservoir, L is the pumping depth,density of liquid-gas mixture, hs-the degree of sinking of the steel sheet,crude oil density, pc-a casing pressure;
the formation pressure used to calculate the production drawdown should be equal to the current reservoir mean pressure.
10. The ultra-low permeability reservoir CO of claim 12The method for predicting the capacity at the initial flooding stage is characterized in that in step 4, the average oil layer thickness h of the oil reservoir is taken as the oil layer thickness of the target block.
11. The ultra-low permeability reservoir CO of claim 12The method for predicting the initial capacity is characterized in that in step 5, the target block CO2The driving initial capacity q is represented by the following calculation formula:
wherein,for corrected CO2Oil recovery index of early-stage oil displacement meter.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110284860A (en) * | 2019-07-19 | 2019-09-27 | 中国石油化工股份有限公司 | Blocky thick-layer sandstone oil reservoir note adopts interactive artificial inclination angle CO2Flooding method |
| CN111472722A (en) * | 2020-03-12 | 2020-07-31 | 中国石油天然气股份有限公司 | Method and device for predicting layered gas production capacity of coal bed gas co-production well |
| CN115405267A (en) * | 2021-05-28 | 2022-11-29 | 中国石油化工股份有限公司 | Low permeability reservoir CO 2 Method for determining evaluation index of flooding effect |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1888382A (en) * | 2006-07-19 | 2007-01-03 | 尤尼斯油气技术（中国）有限公司 | Deep low penetrating oil layer thin oil fire flooding horizontal well gas-injection horizontal well oil production process technology |
| WO2011064375A2 (en) * | 2009-11-30 | 2011-06-03 | Technological Research Ltd. | System and method for increasing production capacity of oil, gas and water wells |
| CN103352693A (en) * | 2013-06-20 | 2013-10-16 | 中国石油天然气集团公司 | Productivity prediction system and method based on oil gas content |
| CN104948177A (en) * | 2015-05-13 | 2015-09-30 | 中国石油天然气集团公司 | Productivity prediction method based on meter liquid production index statistical characteristic law |
| CN105422071A (en) * | 2015-12-07 | 2016-03-23 | 西南石油大学 | Method for evaluating rationality of low-permeability non-homogeneous gas reservoir fracturing horizontal well fracture parameters |
| CN106285621A (en) * | 2015-05-21 | 2017-01-04 | 中国石油化工股份有限公司 | Method based on Multifactor Decision Making offshore oilfield new well in old district production capacity |
-
2018
- 2018-09-07 CN CN201811048219.3A patent/CN109296363B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1888382A (en) * | 2006-07-19 | 2007-01-03 | 尤尼斯油气技术（中国）有限公司 | Deep low penetrating oil layer thin oil fire flooding horizontal well gas-injection horizontal well oil production process technology |
| WO2011064375A2 (en) * | 2009-11-30 | 2011-06-03 | Technological Research Ltd. | System and method for increasing production capacity of oil, gas and water wells |
| CN103352693A (en) * | 2013-06-20 | 2013-10-16 | 中国石油天然气集团公司 | Productivity prediction system and method based on oil gas content |
| CN104948177A (en) * | 2015-05-13 | 2015-09-30 | 中国石油天然气集团公司 | Productivity prediction method based on meter liquid production index statistical characteristic law |
| CN106285621A (en) * | 2015-05-21 | 2017-01-04 | 中国石油化工股份有限公司 | Method based on Multifactor Decision Making offshore oilfield new well in old district production capacity |
| CN105422071A (en) * | 2015-12-07 | 2016-03-23 | 西南石油大学 | Method for evaluating rationality of low-permeability non-homogeneous gas reservoir fracturing horizontal well fracture parameters |
Non-Patent Citations (1)
| Title |
|---|
| 王玉霞等: "CO2混相驱油井产能预测方法", 《东北石油大学学报》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110284860A (en) * | 2019-07-19 | 2019-09-27 | 中国石油化工股份有限公司 | Blocky thick-layer sandstone oil reservoir note adopts interactive artificial inclination angle CO2Flooding method |
| CN110284860B (en) * | 2019-07-19 | 2021-07-06 | 中国石油化工股份有限公司 | Interactive artificial dip angle CO is adopted to cubic thick-layer sandstone oil reservoir notes2Oil displacement method |
| CN111472722A (en) * | 2020-03-12 | 2020-07-31 | 中国石油天然气股份有限公司 | Method and device for predicting layered gas production capacity of coal bed gas co-production well |
| CN111472722B (en) * | 2020-03-12 | 2022-02-01 | 中国石油天然气股份有限公司 | Method and device for predicting layered gas production capacity of coal bed gas co-production well |
| CN115405267A (en) * | 2021-05-28 | 2022-11-29 | 中国石油化工股份有限公司 | Low permeability reservoir CO 2 Method for determining evaluation index of flooding effect |
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