CN110284860B - Interactive artificial dip angle CO is adopted to cubic thick-layer sandstone oil reservoir notes2Oil displacement method - Google Patents

Interactive artificial dip angle CO is adopted to cubic thick-layer sandstone oil reservoir notes2Oil displacement method Download PDF

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CN110284860B
CN110284860B CN201910658474.8A CN201910658474A CN110284860B CN 110284860 B CN110284860 B CN 110284860B CN 201910658474 A CN201910658474 A CN 201910658474A CN 110284860 B CN110284860 B CN 110284860B
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oil
injection
production
formula
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CN110284860A (en
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杨勇
张世明
曹小朋
陈辉
邴绍献
任允鹏
张传宝
王东方
刘营
孙秀芝
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China Petroleum and Chemical Corp
Exploration and Development Research Institute of Sinopec Shengli Oilfield Co
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China Petroleum and Chemical Corp
Exploration and Development Research Institute of Sinopec Shengli Oilfield Co
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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
    • E21B43/164—Injecting CO2 or carbonated water

Abstract

The invention provides an interactive artificial dip angle CO for injection and production of a massive thick-layer sandstone reservoir2An oil displacement method, the interactive artificial dip angle CO for injection and production of the massive thick-layer sandstone reservoir2The oil displacement method comprises the following steps: step 1, determining the thickness of an oil layer jetted from an oil production well; step 2, determining the thickness of the sand body jetted from the injection well; step 3, determining an artificial inclination angle of an injection and production well section; and 4, exchanging injection wells and production wells. The invention relates to interactive artificial dip angle CO for injection and production of massive thick-layer sandstone oil reservoir2Oil displacement method for thick-layer sandstone reservoir CO2The overlap effect caused by flooding and development is realized by adopting CO2The recovery ratio is greatly improved by the mode of high-injection low-production flooding and injection-production well interchange.

Description

Interactive artificial dip angle CO is adopted to cubic thick-layer sandstone oil reservoir notes2Oil displacement method
Technical Field
The invention relates to the technical field of oil field development, in particular to an injection-production interactive artificial inclination angle CO for a massive thick-layer sandstone reservoir2An oil displacement method.
Background
Low permeability reservoir using CO2The flooding can greatly improve the recovery ratio of the oil reservoir, and the conventional CO injection is adopted for the thick-layer low-permeability sandstone oil reservoir2After development, due to CO2The gas density is lower than the crude oil density, so that the injected gas is overlayed on the top of an oil layer, the crude oil at the middle lower part of the oil layer cannot be fully used, the internal wave and the internal wave of the thick-layer oil reservoir are low, and the recovery ratio is low.
At present, injection profiles are adjusted by adopting modes of gas-water alternation, foam slug injection and the like, but the modes of gas-water alternation, foam slug injection and the like are effective in the initial stage due to limited injection capability of a low-permeability reservoir, the injection failure effect is gradually poor due to high formation pressure in the later stage, the problems of shaft corrosion prevention, injection equipment and the like caused by different injection media need to be considered at the same time in the field, and the injection cost is high. Therefore, the invention provides an interactive artificial dip angle CO for injection and production of a massive thick-layer sandstone reservoir2An oil displacement method.
Disclosure of Invention
The invention aims to provide CO for a massive thick-layer sandstone reservoir2The overlap effect caused by flooding and development is realized by adopting CO2Block-shaped thick-layer sandstone reservoir injection-production interactive artificial dip angle CO capable of greatly improving recovery ratio in modes of high-injection low-production flooding and injection-production well interchange2An oil displacement method.
The object of the invention can be achieved by the following technical measures: interactive artificial dip angle CO is adopted to cubic thick-layer sandstone oil reservoir notes2An oil displacement method, the interactive artificial dip angle CO for injection and production of the massive thick-layer sandstone reservoir2The oil displacement method comprises the following steps: step 1, determining the thickness of an oil layer jetted from an oil production well; step 2, determining the thickness of the sand body jetted from the injection well; step 3, determining an artificial inclination angle of an injection and production well section; and 4, exchanging injection wells and production wells.
The object of the invention can also be achieved by the following technical measures:
in the step 1, the economic benefit is taken as the center, the economic limit productivity of the single well is calculated according to the profit-loss balance, and the thickness of the jet-cut oil layer at the bottom of the production well is determined by combining the oil extraction index of the meter.
The step 1 comprises the following steps:
firstly, determining economic limit initial yield
The accumulated sales income in the single-well investment recovery period is as follows:
Figure GDA0002986005520000021
in the formula, ST-cumulative sales revenue in ten thousand yuan per well investment recovery period; q. q.soInitial oil production per well, t/d; b, comprehensively decreasing the surplus rate and decimal in the investment recovery period; tau isoAnnual production rate, decimal; alpha is alphao-commodity rate, decimal; po-oil price, yuan/ton; rTTax, yuan/ton; t-investment recovery period, year;
the values of the annual comprehensive decreasing residual rate are the same, and the summation of the formula (1) is simplified, so that the following result is obtained:
Figure GDA0002986005520000022
cumulative investment per well:
IT＝ID+IB (3)
in the formula IT-total investment per well, ten thousand yuan; i isDDrilling investment, ten thousand yuan; i isB-ground construction investment, ten thousand yuan;
the accumulated operation cost of a single well:
CO＝CV+CG (4)
in the formula, CO-initial annual individual well operating cost, ten thousand yuan; cV-variable cost per well, ten thousand dollars; cG-fixed cost per well, ten thousand yuan;
according to the statistical analysis of mine field data, a good linear relation exists between the variable cost of a single well and the daily liquid production, and the following formula is adopted:
CV＝a+bqL (5)
in the formula, qL-daily liquid production per well, t/d; a and b are each CVAnd q isLThe intercept and slope of the scatter linear equation regression;
considering the operating cost rising rate, the accumulated operating cost of a single well in the investment recovery period is expressed as:
Figure GDA0002986005520000031
in the formula, CT-cumulative operating costs, ten thousand yuan; i-operating cost rising rate, decimal;
q in the formula (5)LAverage value in the recovery period of investment, which follows qoIs changed; summing equation (6) yields:
Figure GDA0002986005520000032
and (3) applying the profit-loss balance principle to obtain:
ST＝IT+CT (8)
the method integrates the above formulas, and simplifies the production process to obtain the economic limit capacity of a single well:
Figure GDA0002986005520000041
determining the thickness of the oil layer jetted from the oil well
The thickness of the jet oil layer of the oil production well meets the economic limit capacity:
qo＝qomin＝JoΔPhp (10)
in the formula, Jo-oil production index in meters, t/(d.mpa.m); delta P-production differential pressure, MPa; h isp-jet-opening the oil layer thickness, m; q. q.soThe daily oil capacity of the oil production well;
according to mine field test results, the formation pressure is kept above the miscible pressure, and the economic benefit is optimal, so that the formation pressure is kept to be the miscible pressure;
ΔP＝Pmixing of-Pwf (11)
In the formula, PMixing of-miscible pressure, MPa; pwf-bottom hole flow pressure, MPa;
the bottom hole flowing pressure calculation formula is as follows:
Pwf＝(Hz-Lb)ρlg+hsρog+pc (12)
in the formula, Hz-depth of middle of oil layer, m; l isb-pump hang depth, m; rholGas-liquid mixture density in the well, kg/m3(ii) a g-acceleration of gravity, m/s2；hs-pump submergence, m; rhooWell crude oil density, kg/m3；pc-casing pressure, MPa;
the combination formula (10-12) is as follows:
qo＝Jo[Pmixing of-(Hz-Lb)ρlg+hsρog+pc]hp
Thickness of oil layer jetted from oil production well:
Figure GDA0002986005520000042
in step 2, the formation pressure is ensured to be kept under the miscible pressure for development, the injection and production balance of the underground volume is kept, the maximum pump pressure is taken as a limit, and the thickness of the shot-out sand body at the top of the injection well can be determined by combining the rice air suction index.
The step 2 comprises the following steps:
determining daily gas injection amount
Daily produced underground volume of oil production well:
Figure GDA0002986005520000051
in the formula, ρNoodleGround crude oil density, kg/m3；BoVolume factor of crude oilA decimal number; f. ofw-water cut,%, of production well; q. q.soThe daily oil capacity of the oil production well;
the injection and production of the underground volume are balanced, and the method comprises the following steps: vp＝VGround
Figure GDA0002986005520000052
In the formula, m-daily CO injection2Mass, MPa; rhoCO2—CO2Density at subsurface temperature pressure, m3/kg；VGroundDaily CO injection2Volume in the ground, m3；
Calculating daily CO injection according to rice air suction index2The quality is as follows:
m＝JgΔpihi (16)
in the formula, Jg-the metric air intake index, t/(d.MPa.m); Δ pi-gas injection pressure difference, MPa; h isi-shot-open sand thickness, m;
wherein, the gas injection pressure difference:
Figure GDA0002986005520000053
in the formula, PPump max-maximum injection pump pressure, MPa; rholiDensity of fluid injected into the wellbore, kg/m3；Hz-depth in reservoir, m; pMixing of-miscible pressure, MPa;
determining the thickness of sand body jetted from gas injection well
Combining the above formulas to obtain:
Figure GDA0002986005520000061
in step 3, CO is obtained according to the injection well-opening sections determined in the step 1 and the step 22Driving the artificial rake angle.
In step 4, when the gas injection front reaches the oil production well, the oil production well sees gas, the productivity is gradually reduced, and after the productivity is reduced to the end of the economic limit, the injection and production wells are exchanged respectively, so that the recovery ratio of the massive thick-layer sandstone oil reservoir is improved.
In step 4, when the production well capacity is lower than the economic limit end production, the following steps are carried out:
Po-RT<Cexercise and control device (19)
In the formula, Po-oil price, yuan/ton; rTTax, yuan/ton; cExercise and control device-operating cost, yuan/ton; at the moment, the injection and production wells and the injection and production well sections are exchanged, so that the recovery ratio of the massive oil reservoir is improved.
The invention relates to interactive artificial dip angle CO for injection and production of massive thick-layer sandstone oil reservoir2An oil displacement method mainly aiming at massive thick-layer sandstone reservoir CO2The overlap effect caused by flooding and development is realized by adopting CO2The recovery ratio is greatly improved by the mode of high-injection low-production flooding and injection-production well interchange. The massive thick-layer sandstone oil reservoir ensures that the formation pressure is kept to be developed under the miscible pressure, the injection and production balance of the underground volume is kept, the economic limit capacity of a single well of a production well is obtained by taking economic benefit as a center, the thickness of an oil layer jetted from the bottom of the production well is determined by combining an oil extraction index, and the thickness of a sand body jetted from the top of an injection well can be determined by an air injection well according to the maximum pump pressure, the pressure keeping level and the air suction index2The flooding effect enables the injection well section of the oil production well and the injection well to be inclined upwards in a certain degree, development is carried out by means of dual effects of an artificial gas cap and crude oil gravity, when the gas injection front edge is pushed to the production well, the productivity is gradually reduced, after the productivity is reduced to the end of the economic limit, the injection wells and the oil production wells are exchanged, and the recovery ratio of the massive thick-layer sandstone oil reservoir can be greatly improved.
Drawings
FIG. 1 shows a preferred embodiment of the present invention for CO production with one injection and one extraction2A schematic diagram of an artificial inclination angle;
FIG. 2 is a schematic diagram of a comparative injection and production well total well CO injection system according to an embodiment of the present invention2A schematic diagram of driving residual oil;
FIG. 3 is a comparative injection and production interactive CO embodiment of the present invention2Driving the residual oil at the artificial inclination angle;
FIG. 4 shows an interactive artificial dip angle CO for injection and production of a massive thick-layer sandstone reservoir according to the present invention2A flow diagram of a particular embodiment of a flooding method.
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.
And step 101, with economic benefits as a center, calculating the economic limit productivity of a single well according to the profit-loss balance, and determining the thickness of a jet-cut oil layer at the bottom of the production well by combining an oil extraction index.
Firstly, determining economic limit initial yield
The accumulated sales income in the single-well investment recovery period is as follows:
Figure GDA0002986005520000071
in the formula, ST-cumulative sales revenue in ten thousand yuan per well investment recovery period; q. q.soInitial oil production per well, t/d; b, comprehensively decreasing the surplus rate and decimal in the investment recovery period; tau isoAnnual production rate, decimal; alpha is alphao-commodity rate, decimal; po-oil price, yuan/ton; rTTax, yuan/ton; t-investment recovery period, year.
The values of the annual comprehensive decreasing residual rate are the same, and the summation of the formula (1) is simplified, so that the following result is obtained:
Figure GDA0002986005520000081
cumulative investment per well:
IT＝ID+IB (3)
in the formula IT-total investment per well, ten thousand yuan; i isDDrilling investment, ten thousand yuan; i isBInvestment in ground construction, ten thousand yuan.
The accumulated operation cost of a single well:
CO＝CV+CG (4)
in the formula, CO-initial annual individual well operating cost, ten thousand yuan; cV-variable cost per well, ten thousand dollars; cGFixed cost per well, ten thousand yuan.
According to the statistical analysis of mine field data, a good linear relation exists between the variable cost of a single well and the daily liquid production, and the following formula is adopted:
CV＝a+bqL (5)
in the formula, qL-daily liquid production per well, t/d.
Considering the operating cost rate, the accumulated operating cost of a single well in the investment recovery period can be expressed as:
Figure GDA0002986005520000082
in the formula, CT-cumulative operating costs, ten thousand yuan; i-operating cost rise rate, decimal.
Q in the formula (5)LAverage value in the recovery period of investment, which follows qoMay vary. Summing equation (6) yields:
Figure GDA0002986005520000091
and (3) applying the profit-loss balance principle to obtain:
ST＝IT+CT (8)
by combining the above formulas, the economic limit capacity of a single well can be simply obtained:
Figure GDA0002986005520000092
thickness of oil layer jetted from oil well
Due to the injection of CO2The gas is injected to form gas top drive between the injection and production wells, the production well is perforated from the bottom of an oil layer, the larger the jet thickness is, the earlier the gas injection front reaches the top of the perforated well section of the oil production wellOnce gas channeling occurs, the productivity of the oil production well can be rapidly reduced, so that the thickness of an oil layer jetted by the oil production well can meet the economic limit productivity of a single well.
qo＝qomin＝JoΔPhp (10)
In the formula, Jo-oil production index in meters, t/(d.mpa.m); delta P-production differential pressure, MPa; h isp-jet-opening the oil layer thickness, m.
According to mine field test results, the formation pressure is kept above the miscible pressure, and the economic benefit is optimal, so that the formation pressure is kept to be the miscible pressure.
ΔP＝PMixing of-Pwf (11)
In the formula, PMixing of-miscible pressure, MPa; pwf-bottom hole flow pressure, MPa.
The bottom hole flowing pressure calculation formula is as follows:
Pwf＝(Hz-Lb)ρlg+hsρog+pc (12)
in the formula, Hz-depth of middle of oil layer, m; l isb-pump hang depth, m; rholGas-liquid mixture density in the well, kg/m3(ii) a g-acceleration of gravity, m/s2；hs-pump submergence, m; rhooWell crude oil density, kg/m3；pc-casing pressure, MPa.
The combination formula (10-12) is as follows:
qo＝Jo[Pmixing of-(Hz-Lb)ρlg+hsρog+pc]hp
Thickness of oil layer jetted from oil production well:
Figure GDA0002986005520000101
and 102, ensuring that the formation pressure is maintained to be developed under miscible pressure, keeping the injection and production balance of the underground volume, and determining the thickness of the shot-out sand body at the top of the injection well by taking the maximum pump pressure as a limit and combining with the air suction index.
Determining daily gas injection amount
Daily produced underground volume of oil production well:
Figure GDA0002986005520000102
in the formula, ρNoodleGround crude oil density, kg/m3；Bo-crude oil volume factor, decimal; f. ofwWater content of oil production well,%.
The injection and production of the underground volume are balanced, and the method comprises the following steps: vp＝VGround
Figure GDA0002986005520000111
In the formula, m-daily CO injection2Mass, MPa; rhoCO2—CO2Density at subsurface temperature pressure, m3/kg；VGroundDaily CO injection2Volume in the ground, m3。
Calculating daily CO injection according to rice air suction index2The quality is as follows:
m＝JgΔpihi (16)
in the formula, Jg-the metric air intake index, t/(d.MPa.m); Δ pi-gas injection pressure difference, MPa; h isiShot-to-open the sand body thickness, m.
Wherein, the gas injection pressure difference:
Figure GDA0002986005520000112
in the formula, PPump max-maximum injection pump pressure, MPa; rholiDensity of fluid injected into the wellbore, kg/m3；Hz-depth in reservoir, m; pMixing of-miscible pressure, MPa.
Thickness of sand body for jetting gas injection well
Combining the above formulas to obtain:
Figure GDA0002986005520000113
103, obtaining CO according to the injection well section of the injection well2Driving the artificial rake angle.
Taking a one-injection one-production high-injection low-production well as an example (figure 1), an included angle between a connecting line of the bottom of an injection well section of the gas injection well and the top of an injection well section of the production well and a horizontal line is defined as CO2Driving the artificial rake angle.
Figure GDA0002986005520000114
In the formula, theta-CO2Driving an artificial inclination angle, °; h-reservoir thickness, m; l is the distance between injection wells and production wells, m.
Then there is CO2Drive artificial inclination angle:
Figure GDA0002986005520000121
and step 104, when the productivity of the oil production well is lower than the economic limit final production, exchanging the injection and production wells, and greatly improving the recovery ratio of the massive thick-layer sandstone oil reservoir.
With the propulsion of the gas injection front edge, the productivity is continuously reduced after the oil production well sees gas.
When the production well capacity is lower than the economic limit final yield, the following steps are carried out:
Po-RT<Cexercise and control device (20)
In the formula, Po-oil price, yuan/ton; rTTax, yuan/ton; cExercise and control deviceOperating cost, yuan/ton.
At the moment, the injection and production wells and the injection and production well sections are exchanged, so that the recovery ratio of the massive thick-layer sandstone oil reservoir can be greatly improved.
In one embodiment of the present invention, the method comprises the following steps:
in the step 1, the economic benefit is taken as the center, the economic limit productivity of the single well is calculated according to the profit-loss balance, and the thickness of the jet-cut oil layer at the bottom of the production well is determined by combining the oil extraction index.
The thickness of an oil layer jetted from the bottom of the production well:
Figure GDA0002986005520000122
in the formula, qoEconomic limit capacity, 8 t/d; j. the design is a squareo-oil production index in meters, 0.04 t/(d.MPa.m); delta P is the production pressure difference, 16 MPa.
In step 2, the formation pressure is ensured to be kept under the miscible pressure for development, the injection and production balance of the underground volume is kept, the maximum pump pressure is taken as a limit, and the thickness of the shot-out sand body at the top of the injection well can be determined by combining the air suction index.
Daily produced underground volume of oil production well:
Figure GDA0002986005520000131
in the formula, ρNoodleGround crude oil density, 0.90kg/m3；Bo-crude oil volume factor, 1.2; f. ofwWater content of oil production well, 20%.
The injection and production of the underground volume are balanced, and the method comprises the following steps: vp＝VGround
Figure GDA0002986005520000132
Daily CO injection2The quality is as follows:
m＝VgroundρCO2＝4.8(kg)＝4.8(t)
In the formula, m-daily CO injection2Mass, MPa; rhoCO2—CO2Density at subsurface temperature (120 ℃) pressure (30MPa), 0.6kg/m3；VGroundDaily CO injection2Volume in the ground, 8m3。
Calculating daily CO injection according to rice air suction index2The quality is as follows:
Figure GDA0002986005520000133
the thickness of the sand body jetted from the injection well is as follows:
Figure GDA0002986005520000134
in the formula, Jg-the metric air intake index, 0.02 t/(d.MPa.m); Δ pi-gas injection pressure difference, MPa; pPump max-maximum injection pump pressure, 35 MPa; rholiDensity of fluid injected into the wellbore, 0.8kg/m3；Hz-depth in reservoir, 3000 m; pMixing of-miscible pressure, 30 MPa.
In step 3, according to the perforation well sections of the oil production well and the gas injection well calculated in the steps 1 and 2, the CO is obtained by combining the oil reservoir thickness and the injection-production well spacing2Driving the artificial rake angle.
Taking a one-injection one-production high-injection low-production well as an example (figure 1), an included angle between a connecting line of the bottom of an injection well section of the gas injection well and the top of an injection well section of the production well and a horizontal line is defined as CO2Driving the artificial rake angle.
Figure GDA0002986005520000141
CO2The driving inclination angle is:
Figure GDA0002986005520000142
in the formula, theta-CO2Driving an artificial inclination angle, °; h, reservoir thickness, 100 m; l is the injection-production well spacing, 240 m.
In step 4, when the productivity of the oil production well is lower than the economic limit final production, the injection and production wells are exchanged, and the recovery ratio of the massive thick-layer sandstone oil reservoir can be greatly improved.
The economic limit end product was calculated to be 0.5t/d based on oil price, tax and operating cost. When the productivity of the oil production well is lower than 0.5t/d, the injection and production wells and the injection and production well sections are exchanged.
Numerical simulation shows that the whole well of the massive thick-layer sandstone reservoir is shot, the top of the oil production well is exposed to gas too early due to the gas overburden effect, and crude oil at the middle and lower parts is difficult to use (figure 2). Injection-production interactive artificial dip angle CO applying the invention2The flooding technique can suppress the influence of gas overspread very well (fig. 3).

Claims (5)

1. Interactive artificial dip angle CO is adopted to cubic thick-layer sandstone oil reservoir notes2The oil displacement method is characterized in that the massive thick-layer sandstone reservoir injection-production interactive artificial dip angle CO2The oil displacement method comprises the following steps:
step 1, determining the thickness of an oil layer jetted from an oil production well;
step 2, determining the thickness of the sand body jetted from the injection well;
step 3, determining an artificial inclination angle of an injection and production well section;
step 4, exchanging injection wells and production wells;
in the step 1, the economic benefit is taken as the center, the economic limit capacity of a single well is calculated according to the profit-loss balance, and the thickness of a jet-out oil layer at the bottom of a production well is determined by combining the oil extraction index of a meter;
the step 1 comprises the following steps:
firstly, determining economic limit initial yield
The accumulated sales income in the single-well investment recovery period is as follows:
Figure FDA0003007326220000011
in the formula, ST-cumulative sales revenue in ten thousand yuan per well investment recovery period; q. q.so-daily oil production per well, t/d; b, comprehensively decreasing the surplus rate and decimal in the investment recovery period; tau isoAnnual production rate, decimal; alpha is alphao-commodity rate, decimal; po-oil price, yuan/ton; rTTax, yuan/ton; t-investment recovery period, year;
the values of the annual comprehensive decreasing residual rate are the same, and the summation of the formula (1) is simplified, so that the following result is obtained:
Figure FDA0003007326220000012
cumulative investment per well:
IT＝ID+IB (3)
in the formula IT-total investment per well, ten thousand yuan; i isDDrilling investment, ten thousand yuan; i isB-ground construction investment, ten thousand yuan;
the accumulated operation cost of a single well:
CO＝CV+CG (4)
in the formula, CO-initial annual individual well operating cost, ten thousand yuan; cV-variable cost per well, ten thousand dollars; cG-fixed cost per well, ten thousand yuan;
according to the statistical analysis of mine field data, a good linear relation exists between the variable cost of a single well and the daily liquid production, and the following formula is adopted:
CV＝a+bqL (5)
in the formula, qLThe daily liquid production of a single well of the oil production well, t/d; a and b are each CVAnd q isLThe intercept and slope of the scatter linear equation regression;
considering the operating cost rising rate, the accumulated operating cost of a single well in the investment recovery period is expressed as:
Figure FDA0003007326220000021
in the formula, CT-cumulative operating costs, ten thousand yuan; i-operating cost rising rate, decimal;
q in the formula (5)LThe daily liquid production of a single well of the oil production well; summing equation (6) yields:
Figure FDA0003007326220000022
and (3) applying the profit-loss balance principle to obtain:
ST＝IT+CT (8)
the method integrates the above formulas, and simplifies the production process to obtain the economic limit capacity of a single well:
Figure FDA0003007326220000023
determining the thickness of the oil layer jetted from the oil well
The thickness of the oil layer jetted by the oil production well meets the economic limit productivity of a single well:
qo＝qomin＝JoΔPhp (10)
in the formula, Jo-oil production index in meters, t/(d.mpa.m); delta P-production differential pressure, MPa; h isp-jet-opening the oil layer thickness, m; q. q.soThe daily oil production of a single well of the oil production well is t/d;
according to mine field test results, the formation pressure is kept above the miscible pressure, and the economic benefit is optimal, so that the formation pressure is kept to be the miscible pressure;
ΔP＝Pmixing of-Pwf (11)
In the formula, PMixing of-miscible pressure, MPa; pwf-bottom hole flow pressure, MPa;
the bottom hole flowing pressure calculation formula is as follows:
Pwf＝(Hz-Lb)ρlg+hsρog+pc (12)
in the formula, Hz-depth of middle of oil layer, m; l isb-pump hang depth, m; rholGas-liquid mixture density in the well, kg/m3(ii) a g-acceleration of gravity, m/s2；hs-pump submergence, m; rhooWell crude oil density, kg/m3；pc-casing pressure, MPa;
the combination formula (10-12) is as follows:
qo＝Jo[Pmixing of-(Hz-Lb)ρlg-hsρog-pc]hp
Thickness of oil layer jetted from oil production well:
Figure FDA0003007326220000031
2. the interactive synthetic dip angle CO of claim 1 for injection and production of massive thick-layer sandstone reservoirs2The oil displacement method is characterized in that in the step 2, the formation pressure is ensured to be kept under miscible pressure for development, the injection and production balance of the underground volume is kept, the maximum pump pressure is taken as a limit, and the thickness of a shot-out sand body at the top of an injection well can be determined by combining the rice air suction index.
3. The interactive synthetic dip angle CO of claim 2 for injection and production of massive thick-layer sandstone reservoirs2The oil displacement method is characterized in that the step 2 comprises the following steps:
determining daily gas injection amount
Daily produced underground volume of oil production well:
Figure FDA0003007326220000041
in the formula, ρNoodleGround crude oil density, kg/m3；Bo-crude oil volume factor, decimal; f. ofw-water cut,%, of production well; q. q.soThe daily oil production of a single well of the oil production well is t/d;
the injection and production of the underground volume are balanced, and the method comprises the following steps: vp＝VGround
Figure FDA0003007326220000042
In the formula, m-daily CO injection2Mass, MPa;
Figure FDA0003007326220000043
—CO2density at subsurface temperature pressure, m3/kg；VGroundDaily CO injection2Volume in the ground, m3；
Calculating daily CO injection according to rice air suction index2The quality is as follows:
m＝JgΔpihi (16)
in the formula, Jg-the metric air intake index, t/(d.MPa.m); Δ pi-gas injection pressure difference, MPa; h isi-shot-open sand thickness, m;
wherein, the gas injection pressure difference:
Figure FDA0003007326220000044
in the formula, PPump max-maximum injection pump pressure, MPa; rholiDensity of fluid injected into the wellbore, kg/m3；Hz-depth in reservoir, m; pMixing of-miscible pressure, MPa; pli-pressure, MPa, caused by injection of fluid in the wellbore;
determining the thickness of sand body jetted from gas injection well
Combining the above formulas to obtain:
Figure FDA0003007326220000051
4. the interactive synthetic dip angle CO of claim 1 for injection and production of massive thick-layer sandstone reservoirs2The oil displacement method is characterized in that in step 3, CO is obtained according to the injection well-opening sections determined in step 1 and step 22Driving the artificial rake angle.
5. The massive thick-layer sandstone reservoir injection-production cross-over of claim 1Mutual artificial inclination angle CO2The oil displacement method is characterized in that in the step 4, when the gas injection front reaches the oil production well, the oil production well sees gas, the productivity is gradually reduced, and after the productivity is reduced to the end of the economic limit, the injection and production wells are exchanged respectively, so that the recovery ratio of the massive thick-layer sandstone oil reservoir is improved.
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