CN108019194A - The method that more well linkage steam injections improve development result of heavy oil reservoirs - Google Patents
The method that more well linkage steam injections improve development result of heavy oil reservoirs Download PDFInfo
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- CN108019194A CN108019194A CN201610974045.8A CN201610974045A CN108019194A CN 108019194 A CN108019194 A CN 108019194A CN 201610974045 A CN201610974045 A CN 201610974045A CN 108019194 A CN108019194 A CN 108019194A
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- steam injection
- well
- linkage
- steam
- heavy oil
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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
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
Abstract
The present invention, which provides a kind of more well linkage steam injections, improves the method for development result of heavy oil reservoirs, and the method which improves development result of heavy oil reservoirs includes：Step 1, the optimal well group for implementing linkage steam injection is chosen；Step 2, the optimal oil layer section of linkage steam injection is determined；Step 3, the cyclic steam injection volume of each well is determined, steam injection rate, boils in a covered pot over a slow fire the well time, consider the physical property characteristic of each well, effective thickness, using steam injection amount as optimized variable, establishes note and adopt optimization model；Step 4, according to each well steam injection amount of calculating and definite construction parameter, linkage steam injection construction operation is carried out.The method that more well linkage steam injections improve development result of heavy oil reservoirs can fill up the blank of " in Development of Viscous Crude Oil, steam injection channeling, steam injection are uneven, and layer position is uneven by effect ", and have the characteristics that method is simple, workable, effective practical.
Description
Technical field
The present invention relates to oil field development technical field, especially relates to a kind of more well linkage steam injection improvement heavy crude reservoirs and opens
The method for sending out effect.
Background technology
Heavy crude reservoir is restricted by itself reservoir conditions and technology, in the process of development, the other oil wells of well steam injection
Channeling, steam injection development effectiveness are bad.
At present, steam injection development is still the major way of domestic Development of Viscous Crude Oil.The technologies such as single oil reservoir steam injection are in
State's development is more mature, and steam injection technology is advanced in the world.But there are channeling phenomenon, steam injection to open for China's heavy crude reservoir steam injection process
Hair effect is bad, and the gas oil ratio of steam injection exploitation is up to 0.5, and minimum only 0.2, averagely about 0.4.How to improve channeling to show
As it is always the problem of oil field development technical staff studies tackling key problem to improve steam injection efficiency, and there is an urgent need to study new method.For this
We have invented a kind of method that new more wells linkage steam injection improves development result of heavy oil reservoirs, solves above technical problem.
The content of the invention
Principle of the invention based on same layer steam injection and layer position equilibrium producing, it is proposed that a kind of more well linkage steam injections improve viscous crude
The method of effect of reservoir development, so that the steam injection for expanding heavy crude reservoir involves scope, improves injection steam utilization, and change significantly
Kind development result of heavy oil reservoirs.
The purpose of the present invention can be achieved by the following technical measures：More well linkage steam injections improve development result of heavy oil reservoirs
Method, the linkage steam injection improve development result of heavy oil reservoirs method include：Step 1, choose and implement the optimal of linkage steam injection
Well group；Step 2, the optimal oil layer section of linkage steam injection is determined；Step 3, the cyclic steam injection volume of each well is determined, steam injection rate, boils in a covered pot over a slow fire well
Time, considers the physical property characteristic of each well, effective thickness, using steam injection amount as optimized variable, establishes note and adopt optimization model；
Step 4, according to each well steam injection amount of calculating and definite construction parameter, linkage steam injection construction operation is carried out.
The purpose of the present invention can be also achieved by the following technical measures：
In step 1, according to the location of this oil reservoir, construction feature, reservoir characteristic, remaining oil enrichment region and mesh
Preceding well pattern, in conjunction with the hole condition condition of each well, chooses the optimal well group for implementing linkage steam injection.
In step 2, according to the thickness of reservoir, physical property characteristic and the creation data of early period, linkage steam injection is determined most
Good oil layer section, according to the well number of the connection situation between each well oil reservoir, definite linkage steam injection.
In step 3, it is as follows to adopt optimization model for the note of foundation：According to the principal element of steam soak development effectiveness point
Analysis, it is determined that the major parameter of optimization is cyclic steam injection volume, steam injection rate, stewing well time；For steam injection amount, by every rice bran oil layer 80
~120t is counted, and cyclic steam injection volume scope is selected between 500t~2000t；Steam injection rate scope is in 150t/d~250t/d；It is stewing
Well time range is in 1d~9d.
In step 3, cyclic steam injection volume takes 1000t, 1500t, 2000t in value range, and steam injection rate is in value model
150t/d, 200t/d, 250t/d are taken in enclosing, the stewing well time takes 1d, 5d, 9d in value range, is designed as 27 comparing calculations
Scheme, carries out the prediction of 27 groups of steam soak schemes respectively, handles up a cycle, calculates per prescription according to design load per prescription case
The cumulative oil production of case, cumulative water production, accumulation steam injection amount, contrast 27 scenario outcomes, determine that block period steam injection amount is
1500t~2000t, steam injection rate are 150t/d~200t/d, boil in a covered pot over a slow fire the well time in 1d~9d.
Step 4 includes following steps：1. lower steam injection process pipe string；2. cut open casing doughnut-shaped steel plate；3. installation is a full set of
Steam injection well head simultaneously connects ground steam injection pipeline；4. carry out more well linkage steam injections by the steam injection parameter of design；5. well after the completion of steam injection
Mouth installation heatproof pressure gauge carries out stewing well.
The method that more wells linkage steam injection in the present invention improves development result of heavy oil reservoirs, is related to applied to oil exploitation
Development result of heavy oil reservoirs is improved by more wells linkage steam injection technology in journey, different oil well injection allocation difference steam injections are determined by calculation
Measure to realize the equilibrium producing of unicom layer position, so that the steam injection for expanding heavy crude reservoir involves scope, improve injection steam utilization,
And substantially improve development result of heavy oil reservoirs.Case verification the result shows that：The present invention can fill up " in Development of Viscous Crude Oil, steam injection
Channeling, steam injection are uneven, and layer position is uneven by effect " blank, and there is simple, workable, the effective practicality of method.
Brief description of the drawings
Fig. 1 is the stream for the specific embodiment that more wells linkage steam injection of the present invention improves the method for development result of heavy oil reservoirs
Cheng Tu.
Embodiment
For enable the present invention above and other objects, features and advantages become apparent, it is cited below particularly go out preferable implementation
Example, and coordinate shown in attached drawing, it is described in detail below.
As shown in Figure 1, more wells that Fig. 1 is the present invention link, steam injection improves the flow of the method for development result of heavy oil reservoirs
Figure.
Step 101：According to the location of this oil reservoir, construction feature, reservoir characteristic, remaining oil enrichment region and at present
Well pattern, in conjunction with the hole condition condition of each well, choose the optimal well group for implementing more wells linkage steam injections.
Step 102：According to the thickness of reservoir, physical property characteristic and the creation data of early period, more well linkage steam injections are determined
Optimal oil layer section, according to the connection situation between each oil reservoir, determines the well numbers of more wells linkage steam injections.
Step 103：Determine the steam injection amount of each well, consider the physical property characteristic of each layer, effective thickness, using steam injection amount to be excellent
Change variable, it is as follows that the note of foundation adopts optimization model：
According to the Main factor analysis of steam soak development effectiveness, it is determined that the major parameter of optimization for cyclic steam injection volume,
Steam injection rate, stewing well time.For steam injection amount, based on 80~120t of every rice bran oil layer, cyclic steam injection volume scope be selected in 500t~
Between 2000t；Steam injection rate scope is in 150t/d~250t/d；Stewing well time range is in 1d~9d.Each parameter is taking
3 kinds of different contrast schemes are designed in the range of value, it is as shown in table 1 below.
1 parameter optimization of steam soaking conceptual design table of table
| Parameter | 1 | 2 | 3 |
| Cyclic steam injection volume, t | 1000 | 1500 | 2000 |
| Steam injection rate, t/d | 150 | 200 | 250 |
| Stewing well time, d | 1 | 5 | 9 |
The process of optimization that note adopts parameter substantially can be regarded as the multilevel numerical experimentation process of a multiple-factor.
According to above-mentioned requirements, 27 comparing calculation schemes are devised.By 27 designed schemes, for block concrete condition, from
September starts on the 1st within 2015, simulates the production in a cycle of handling up, produces always on April 1st, 2016.
Parameter optimization result
According to conceptual design, the prediction of 27 groups of steam soak schemes is carried out respectively.Per prescription case one is handled up according to design load
In a cycle, calculate per the cumulative oil production of prescription case, cumulative water production, accumulation steam injection amount, the results are shown in Table shown in 2-4.
Creation data when 2 steam injection amount of table is 1000t under different note speed, stewing well time conditions
Creation data when 3 steam injection amount of table is 1500t under different note speed, stewing well time conditions
Creation data when 4 steam injection amount of table is 2000t under different note speed, stewing well time conditions
Using 27 comparing calculation schemes of numerical simulation calculation, handle up a cycle according to design load per prescription case, it is raw
Production 8 months.Contrast in 27 scenario outcomes, consider each side factor, block period steam injection amount is 1500t~2000t, note
Vapour speed is 150t/d~200t/d, boils in a covered pot over a slow fire the well time for 5d or so.
Step 104：According to each well steam injection amount of calculating, steam injection construction operation is carried out.Mainly comprising following steps 1.
Lower steam injection process pipe string；2. cut open casing doughnut-shaped steel plate；3. a full set of steam injection well head of installation simultaneously connects ground steam injection pipeline；4. by setting
The steam injection parameter of meter carries out more well linkage steam injections；5. well head installation heatproof pressure gauge carries out stewing well after the completion of steam injection.
It is the instantiation of the application present invention below.
Step 1: two：Choose optimal well group and the well number for implementing linkage steam injection.
Construction well GD903-6, GD905-10 produce layer position at present identical, interval permeability, oil density, viscosity and mineralising
Degree difference is small, and since steam injection process is there are channeling, steam injection efficiency is poor, therefore chooses the well group and carry out linkage heat extraction by steam injection.
Step 3：Determine the construction parameter of linkage steam injection well group, parameter list is as follows：
The linkage well group steam injection design parameter table of table 5
Step 4：Realize linkage steam injection construction operation.
1st, lower steam injection process pipe string
Lower steam injection string：Horn mouth+Φ 76mm oil pipe 9.5m+ chemistry heat-sensitive packers 0.5m+41/2in×27/8In Gao Zhen
Empty instlated tubular (chamfering) 300m+ thermal recovery compensators+41/2in×27/8In high vacuum insulation pipe 954.56m are to well head.
Steam injection well head uses high pressure special type thermal production well mouth, suitable for subcritical pressure boiler steam injection.Well head installation heatproof, resistance to
Each one piece of pressure oil, casing pressure table, it is desirable to which testing pressure of well head 25MPa, 3min, which are not pierced, not to be leaked for qualification.
2nd, doughnut-shaped steel plate is cut open
Note：(1) carried out when cutting doughnut-shaped steel plate by corresponding working specification, with good fire extinguisher, accomplish safe construction.
Production string is protected, forbids to cause production string to destroy.
3rd, ground steam injection pipeline is connected.
First to steam injection pipeline pipeline purging, secondly testing pressure of well head 25MPa, 3min, which are not pierced, does not leak for qualification.Ground steam injection pipeline
Kept the temperature with well head.
4. steam injection
Steam injection is implemented to oil reservoir by the steam injection parameter of design.Steam injection process pays attention to recording steam injection pressure change, so as to timely
Steam injection parameter is adjusted according to pressure.
5th, well is boiled in a covered pot over a slow fire
After the completion of steam injection, well head installation heatproof pressure gauge boils in a covered pot over a slow fire well 2-4 days, and the stewing well time is adjusted according to actual conditions.
6th, open flow
With oil nozzle open flow.Open flow initial stage is existed with 3-10mm oil nozzles open flow (replacing oil nozzle successively), Liquid output control in first day
15m3Within/d, Liquid output control is in 20m within second day3Within/d, later Liquid output control is in 30m3Within/d, finally remove oil
Mouth.Turn to take out during open-flow to atmospheric pressure.Liquid sand content is once produced it is required that being measured in the open flow stage per 8h.
Construction effect：
The well group implements linkage steam injection, constructs and is performed in strict accordance with design parameter, and individual well is averaged day oil-producing 13.5 after operation
Ton, tires out 3258 tons of increasing oil year, development effectiveness is obvious.
Claims (6)
- The method that the linkage steam injection of well more than 1. improves development result of heavy oil reservoirs, it is characterised in that the linkage steam injection improves viscous crude oil Hiding the method for development effectiveness includes：Step 1, the optimal well group for implementing linkage steam injection is chosen；Step 2, the optimal oil layer section of linkage steam injection is determined；Step 3, the cyclic steam injection volume of each well is determined, steam injection rate, boils in a covered pot over a slow fire the well time, considers the physical property characteristic of each well, effectively Thickness, using steam injection amount as optimized variable, establishes note and adopts optimization model；Step 4, according to each well steam injection amount of calculating and definite construction parameter, linkage steam injection construction operation is carried out.
- 2. the method that more well linkage steam injections according to claim 1 improve development result of heavy oil reservoirs, it is characterised in that In step 1, according to the location of this oil reservoir, construction feature, reservoir characteristic, remaining oil enrichment region and current development well Net, in conjunction with the hole condition condition of each well, chooses the optimal well group for implementing linkage steam injection.
- 3. the method that more well linkage steam injections according to claim 1 improve development result of heavy oil reservoirs, it is characterised in that In step 2, according to the thickness of reservoir, physical property characteristic and the creation data of early period, the optimal oil layer section of definite linkage steam injection, root According to the well number of the connection situation between each well oil reservoir, definite linkage steam injection.
- 4. the method that more well linkage steam injections according to claim 1 improve development result of heavy oil reservoirs, it is characterised in that In step 3, it is as follows that the note of foundation adopts optimization model：According to the Main factor analysis of steam soak development effectiveness, it is determined that The major parameter of optimization is cyclic steam injection volume, steam injection rate, stewing well time；For steam injection amount, based on 80~120t of every rice bran oil layer, Cyclic steam injection volume scope is selected between 500t~2000t；Steam injection rate scope is in 150t/d~250t/d；Stewing well time range In 1d~9d.
- 5. the method that more well linkage steam injections according to claim 4 improve development result of heavy oil reservoirs, it is characterised in that In step 3, cyclic steam injection volume takes 1000t, 1500t, 2000t in value range, and steam injection rate takes 150t/ in value range D, 200t/d, 250t/d, stewing well time take 1d, 5d, 9d in value range, are designed as 27 comparing calculation schemes, respectively into The prediction of 27 groups of steam soak schemes of row, handles up a cycle per prescription case according to design load, calculates the accumulation production per prescription case Oil mass, cumulative water production, accumulation steam injection amount, contrast 27 scenario outcomes, and it is 1500t~2000t to determine block period steam injection amount, Steam injection rate is 150t/d~200t/d, boils in a covered pot over a slow fire the well time in 1d~9d.
- 6. the method that more well linkage steam injections according to claim 1 improve development result of heavy oil reservoirs, it is characterised in that step Rapid 4 include following steps：1. lower steam injection process pipe string；2. cut open casing doughnut-shaped steel plate；3. a full set of steam injection well head of installation is simultaneously Connect ground steam injection pipeline；4. carry out more well linkage steam injections by the steam injection parameter of design；5. well head installs heatproof after the completion of steam injection Pressure gauge carries out stewing well.
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Cited By (1)
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| CN114251075A (en) * | 2020-09-23 | 2022-03-29 | 中国石油大学(北京) | Reservoir exploitation scheme determination method, device and equipment based on multi-target parameters |
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Application publication date: 20180511 |