CN111749660A - Well pattern injection and production method and device - Google Patents
Well pattern injection and production method and device Download PDFInfo
- Publication number
- CN111749660A CN111749660A CN201910247387.3A CN201910247387A CN111749660A CN 111749660 A CN111749660 A CN 111749660A CN 201910247387 A CN201910247387 A CN 201910247387A CN 111749660 A CN111749660 A CN 111749660A
- Authority
- CN
- China
- Prior art keywords
- well pattern
- well
- injection
- oil
- water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
-
- 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
- E21B43/30—Specific pattern of wells, e.g. optimizing the spacing of wells
Abstract
The invention provides a well pattern injection and production method and a device, wherein the method comprises the following steps: when water is injected into a water injection well in a well pattern, all oil production wells in the well pattern are parallelly exploited for each development layer of an oil reservoir in which the well pattern is located until the oil reservoir in which the well pattern is located reaches a set water content, wherein all the oil production wells in the well pattern penetrate through the development layer. The invention can realize injection and production of the well pattern among a plurality of development layers, eliminate interlayer interference among the development layers, improve the water flooding wave and degree in the development layers and has high well pattern utilization rate.
Description
Technical Field
The invention relates to the technical field of oilfield development. In particular to a well pattern injection and production method and a device.
Background
At present, the separate injection and separate production of a plurality of oil fields at home and abroad are directed separate injection and separate production, namely, in a well group, a water injection well is usually injected and a production well is jointly produced, a water injection well is jointly injected and a production well is singly produced, or a water injection well is injected and a production well is partially separately produced, and the like. In the well pattern modes, the well pattern on the plane is imperfect, the injection and production on the longitudinal direction are not corresponding, the interference still exists between layers, and the utilization rate of the well pattern and the utilization rate of the injected water are low.
Fig. 1 is a current co-injection single-production well pattern, as shown in fig. 1, on one hand, if the difference between the physical properties of two sets of strata reservoirs is large, injected water flows preferentially to the strata with good physical properties to form a water drive dominant channel, a poor oil layer cannot be effectively used, interlayer interference or contradiction is increased, and the longitudinal water drive utilization degree of an oil reservoir is low; on the other hand, because two sets of strata series are mined by two sets of well patterns, the utilization rate of the well patterns is low, and meanwhile, if the heterogeneity difference in the development strata series is strong, injected water can preferentially flow to an area with good physical properties, so that the water in the development strata series is driven to be uneven, and residual oil cannot be effectively excavated.
In summary, the existing separate injection and separate production well pattern has the problems of large interference between development layers, low well pattern utilization rate and the like in the process of exploiting a multilayer oil reservoir, so that the longitudinal water drive utilization degree is low, and the development possibility of a water drive dominant channel is high.
Disclosure of Invention
The invention provides a well pattern injection-production method, which is used for realizing injection-production of a well pattern among a plurality of development layers, eliminating interference among the development layers, improving water flooding waves and the degree in the development layers and having high well pattern utilization rate, and comprises the following steps:
when water is injected into a water injection well in a well pattern, all oil production wells in the well pattern are parallelly exploited for each development layer of an oil reservoir in which the well pattern is located until the oil reservoir in which the well pattern is located reaches a set water content, wherein all the oil production wells in the well pattern penetrate through the development layer.
The invention provides a well pattern injection-production device, which is used for realizing injection-production of a well pattern among a plurality of development layers, reducing the interference among the development layers, improving the water flooding waves and the degree in the development layers, and having high well pattern utilization rate, and comprises the following components:
and the injection and production module is used for performing parallel production on all the oil production wells in the well pattern aiming at each development layer series of the oil deposit where the well pattern is located when water is injected into the water injection wells in the well pattern until the oil deposit where the well pattern is located reaches a set water content, wherein all the oil production wells in the well pattern penetrate through the development layer series.
The embodiment of the invention also provides computer equipment which comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein the processor realizes the well pattern injection and production method when executing the computer program.
An embodiment of the present invention further provides a computer-readable storage medium, which stores a computer program for executing the above-mentioned well pattern injection-production method.
In the embodiment of the invention, when water is injected into the water injection well in the well pattern, all the oil production wells in the well pattern are parallelly exploited for each development layer of the oil deposit of the well pattern until the oil deposit of the well pattern reaches the set water content, wherein all the oil production wells in the well pattern penetrate through the development layer. In the execution process, all the oil production wells in the well pattern are exploited according to each development layer of the oil reservoir where the well pattern is located, so that the interference among the development layers can be eliminated, the water flooding waves and the water flooding degree in the development layers can be improved, and all the oil production wells among all the development layers can be exploited in parallel, and the utilization rate of the well pattern can be improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts. In the drawings:
FIG. 1 is a current co-injection single-production well pattern;
FIG. 2 is a flow chart of a well pattern injection and production method in an embodiment of the invention;
FIG. 3 is a schematic illustration of a well pattern utilizing a method of the present invention in an embodiment of the present invention;
FIGS. 4 and 5 show the distribution of residual oil in the system A and the system B, respectively, in a co-injection single-production mode;
FIGS. 6 and 7 show the distribution of residual oil in the system A and the system B after 20 years of co-injection single production;
FIGS. 8 and 9 are the residual oil distributions of system A and system B after 20 years, respectively, using the method of the present invention;
FIG. 10 is a graph comparing the degree of oil production from the reservoir using a co-injection single-production method and the method of the present invention;
FIG. 11 is a schematic illustration of a well pattern injection and production apparatus in an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
Separate-layer water injection and separate-layer oil extraction are important means for improving the recovery ratio of a multilayer system oil reservoir, and are fully utilized in oil fields at home and abroad. However, in the current separate injection and separate production well pattern, a plurality of production wells of the well pattern are not simultaneously produced in the process of producing a multi-layer oil deposit, so that the interference between development layers of the oil deposit where the well pattern is located is large, water in the development layers is driven to waves and is uneven, the utilization rate of the well pattern and the utilization rate of injected water are low, the oil displacement efficiency of the oil deposit is low, and the development and adjustment potential is large. In the process of performing separate injection and separate production in an oil field, under the condition that the existing basic well pattern is determined, in order to thoroughly eliminate interlayer interference among different development layers and improve the longitudinal oil reservoir exploitation degree; meanwhile, the existing well pattern can be fully utilized to conduct well pattern recombination, the well pattern utilization rate and the control degree of water flooding reserves in the development layer series are improved, the multiple effects of well pattern encryption, well pattern conversion and water injection in the development layer series are achieved, and the final recovery ratio of the oil field is further improved.
Fig. 2 is a flow chart of a well pattern injection and production method in an embodiment of the invention, as shown in fig. 2, the method includes:
In the embodiment of the invention, in the execution process, all the oil production wells in the well pattern are exploited aiming at each development layer of the oil reservoir where the well pattern is located, so that the interference among the development layers can be eliminated, the water flooding waves and the water flooding degree in the development layers can be improved, all the oil production wells among all the development layers can be exploited in parallel, and the utilization rate of the well pattern can be improved.
In one embodiment, waterflooding a waterflooding well in a well pattern comprises:
and carrying out separate-layer water injection on the water injection well in the well pattern.
In specific implementation, the stratified water injection means that a packer is put into a water injection well to separate oil layers with larger differences, and then a water distributor is used for carrying out stratified water distribution, so that the water injection rate of a high-permeability layer is controlled, the water injection rate of a medium-low permeability oil layer is enhanced, and various oil layers can play roles.
In one embodiment, the well pattern comprises 1 water injection well and a plurality of oil production wells;
the water injection well is located in the center of the well pattern, and the multiple oil production wells surround the water injection well.
In particular embodiments, the multiple production wells surround the water injection wells such that both the side wells and the corner wells of the well pattern are fired to produce, for example, the well pattern may include 1 water injection well and 8 production wells to perform a reverse nine point well pattern.
Fig. 3 is a schematic view of a well pattern using the method of the present invention in an embodiment of the present invention, as shown in fig. 3, the well pattern having two sets of development layers in a stacked development layer series, a first development layer series a and a second development layer series B from top to bottom. The well pattern is a reverse nine-point well pattern with 1 well in the center and 8 wells around for oil extraction; in practice, production wells in the first and second development strata a and B need to be produced simultaneously.
In one embodiment, the limiting water content is 98%.
The following provides an embodiment of the present invention for a specific application of the method for producing a well pattern by injection-production between layers.
The current geological reserve extraction degree of a certain two-layer system sandstone oil field with high water content is 50%, and the water content is 90%. The oil field adopts two sets of well patterns for exploitation, and the mode used is a well pattern co-injection single-exploitation mode shown in figure 1. The layer system A is an upper development layer system, the layer system B is a lower development layer system, and the reservoir physical property of the layer system B is better than that of the layer system A. The combined injection and single production refers to that the water injection well injects water to two layer systems at the same time, a separate layer water injection mode is not adopted, and a mode that each development layer system is independently exploited is adopted when the oil production well produces oil, namely in the well pattern in the figure 1, in the development layer system A, the water injection well injects water, the side well produces oil, the corner well does not produce, namely the five-point well pattern consisting of the water injection well and the side well produces oil; in the development layer system B, water is injected from the water injection well, oil is produced from the corner well, and the side well does not produce, namely the five-point well pattern consisting of the water injection well and the corner well produces. Conceptualization processing is carried out on the oil reservoir where the well pattern is located in the combined injection single-production mode, wherein the conceptualization processing is to process an actual oil reservoir into a homogeneous oil reservoir, the physical property difference of the two development layer systems is large, numerical reservoir simulation is carried out on the conceptualization processed well pattern, and finally the remaining oil distribution situation when the oil reservoir is combined injection and single production is obtained, and the remaining oil distribution situation of the layer system A and the layer system B in the combined injection single-production mode is respectively shown in the figures 4 and 5. In the longitudinal direction, the physical property of the reservoir layer system B is good, the water flooding extent is far higher than that of the reservoir layer system A, the residual oil is relatively enriched, and the overall water flooding extent of the reservoir layer system A is low, so that interlayer interference exists between the reservoir layer system A and the reservoir layer system B. In plan view, residual oil is enriched at the position of the corner well in the layer system A and the position of the side well in the layer system B, and the residual oil is high in saturation, so that plane water flooding is uneven on the plane due to the production states of the corner well and the side well.
Fig. 6 and 7 show the distribution of the remaining oil in layer system a and layer system B after 20 years of co-injection and single production mode, respectively, and it can be seen from the graphs that the remaining abundance of the reserve in layer system a is significantly higher than that of layer system B in the longitudinal direction, which indicates that the interlayer interference is aggravated, and layer system B is a water-flooding dominant layer. On the plane, the residual oil at the corner well position in the layer system A and the side well position in the layer system B is still enriched, which shows that under the co-injection single-production mode, obvious interference exists between the layer systems, and the water flooding wave and unevenness are caused by different production states of oil wells in the layer systems. In the co-injection single-recovery mode and when the ultimate water content (98% water content) is reached, the final oil reservoir recovery rate is 52.7%.
Then, injection and production are carried out by adopting the method provided by the invention, the set water content is determined to be 98%, the well pattern is a reverse nine-point well pattern shown in figure 3, and in specific implementation, a water injection well adopts a separate injection pipe column to implement separate layer water injection; the oil production well adopts a separate production pipe column to carry out separate-layer oil production.
When water is injected into a water injection well in a well pattern, aiming at two development layers of an oil reservoir where the well pattern is located, all oil production wells in the well pattern are exploited in parallel until the oil reservoir where the well pattern is located reaches a set water content of 98%.
Carrying out numerical reservoir simulation on the well pattern subjected to conceptualization treatment, wherein after the method is adopted, the final mining rate of the oil reservoir is 61.4% when the ultimate water content is reached (the water content is 98%); fig. 8 and fig. 9 are the residual oil distribution conditions of the system a and the system B after 20 years by using the method of the present invention, respectively, and it can be seen that the residual oil saturation of the position of the corner well in the system a and the position of the side well in the system B are both low, the residual oil distribution difference between the system a and the system B is not large, and the water flooding degree is both high; the water flooding extent of the longitudinal upper strata system A is greatly improved, the residual oil at the plane upper corner well and the side well is effectively used, and the ultimate recovery rate of the oil reservoir is improved under the condition of not drilling a new well.
FIG. 10 is a comparison graph of the oil production degree of the oil reservoir by the co-injection single-production method and the method provided by the invention, as shown in FIG. 10, the oil production degree is improved by 8.7% compared with the existing co-injection single-production well pattern by the method provided by the invention, and the oil increasing effect is obvious.
Based on the same inventive concept, the embodiment of the invention also provides a well pattern injection and production device, as described in the following embodiments. Because the principles for solving the problems are similar to the well pattern injection and production method, the implementation of the device can be referred to the implementation of the method, and repeated parts are not described in detail.
Fig. 11 is a schematic view of a well pattern injection and production device in an embodiment of the invention, as shown in fig. 11, the device comprises:
and the injection and production module 1101 is configured to, when water is injected into a water injection well in the well pattern, perform parallel production on all the production wells in the well pattern for each development layer of the oil reservoir in which the well pattern is located until the oil reservoir in which the well pattern is located reaches a set water content, where all the production wells in the well pattern pass through the development layer.
In the embodiment of the invention, when water is injected into the water injection well in the well pattern, all the oil production wells in the well pattern are parallelly exploited for each development layer of the oil deposit of the well pattern until the oil deposit of the well pattern reaches the set water content, wherein all the oil production wells in the well pattern penetrate through the development layer. In the execution process, all the oil production wells in the well pattern are exploited according to each development layer of the oil reservoir where the well pattern is located, so that the water flooding wave and degree in the development layer are improved, the longitudinal water flooding effect is improved, all the oil production wells among all the development layers are exploited in parallel, and the utilization rate of the well pattern can be improved.
In addition, in the development layer system, the well pattern is converted from the original five-point well pattern into an inverse nine-point well pattern, which is equivalent to adding a new production well in the residual oil enrichment area, thus realizing the well pattern encryption and greatly improving the utilization degree of the water drive reserves.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A well pattern injection and production method, comprising:
when water is injected into a water injection well in a well pattern, all oil production wells in the well pattern are parallelly exploited for each development layer of an oil reservoir in which the well pattern is located until the oil reservoir in which the well pattern is located reaches a set water content, wherein all the oil production wells in the well pattern penetrate through the development layer.
2. The well pattern injection and production method of claim 1, wherein injecting water into a water injection well in the well pattern comprises:
and carrying out separate-layer water injection on the water injection well in the well pattern.
3. The well pattern injection and production method of claim 1, wherein the well pattern comprises 1 water injection well and a plurality of oil production wells;
the water injection well is located in the center of the well pattern, and the multiple oil production wells surround the water injection well.
4. The well pattern injection and production method of claim 1, wherein the set water content is 98%.
5. A well pattern injection and production device, comprising:
and the injection and production module is used for performing parallel production on all the oil production wells in the well pattern aiming at each development layer series of the oil deposit where the well pattern is located when water is injected into the water injection wells in the well pattern until the oil deposit where the well pattern is located reaches a set water content, wherein all the oil production wells in the well pattern penetrate through the development layer series.
6. The injection-production device of claim 5, wherein the injection-production module is specifically configured to:
and carrying out separate-layer water injection on the water injection well in the well pattern.
7. The injection and production apparatus of claim 5, wherein the well pattern comprises 1 water injection well and a plurality of oil production wells;
the water injection well is located in the center of the well pattern, and the multiple oil production wells surround the water injection well.
8. The well pattern injection and production device of claim 5, wherein the set water content is 98%.
9. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of any one of claims 1 to 4 when executing the computer program.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program for executing the method of any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910247387.3A CN111749660B (en) | 2019-03-29 | 2019-03-29 | Well pattern injection and production method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910247387.3A CN111749660B (en) | 2019-03-29 | 2019-03-29 | Well pattern injection and production method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111749660A true CN111749660A (en) | 2020-10-09 |
| CN111749660B CN111749660B (en) | 2022-06-03 |
Family
ID=72671952
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910247387.3A Active CN111749660B (en) | 2019-03-29 | 2019-03-29 | Well pattern injection and production method and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111749660B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6167966B1 (en) * | 1998-09-04 | 2001-01-02 | Alberta Research Council, Inc. | Toe-to-heel oil recovery process |
| CN102839959A (en) * | 2012-09-04 | 2012-12-26 | 中国石油天然气股份有限公司 | Longitudinally superposed developing two-strata oil reservoir well pattern, and arrangement method of two-strata oil reservoir well pattern |
| CN104747147A (en) * | 2015-03-24 | 2015-07-01 | 中国石油天然气股份有限公司 | Water drive development oil reservoir well pattern injection-production relation determination method |
| CN206513360U (en) * | 2016-12-14 | 2017-09-22 | 中国石油天然气股份有限公司 | A kind of three-dimensional well pattern structure |
| CN107218024A (en) * | 2017-05-02 | 2017-09-29 | 中国石油天然气股份有限公司 | The method of adjustment of multilayer low permeability sandstone reservoir high water-cut stage rhombic inverted nini-spot well pattern |
| CN208473829U (en) * | 2018-05-23 | 2019-02-05 | 中国石油天然气股份有限公司 | Combine well pattern structure |
-
2019
- 2019-03-29 CN CN201910247387.3A patent/CN111749660B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6167966B1 (en) * | 1998-09-04 | 2001-01-02 | Alberta Research Council, Inc. | Toe-to-heel oil recovery process |
| CN102839959A (en) * | 2012-09-04 | 2012-12-26 | 中国石油天然气股份有限公司 | Longitudinally superposed developing two-strata oil reservoir well pattern, and arrangement method of two-strata oil reservoir well pattern |
| CN104747147A (en) * | 2015-03-24 | 2015-07-01 | 中国石油天然气股份有限公司 | Water drive development oil reservoir well pattern injection-production relation determination method |
| CN206513360U (en) * | 2016-12-14 | 2017-09-22 | 中国石油天然气股份有限公司 | A kind of three-dimensional well pattern structure |
| CN107218024A (en) * | 2017-05-02 | 2017-09-29 | 中国石油天然气股份有限公司 | The method of adjustment of multilayer low permeability sandstone reservoir high water-cut stage rhombic inverted nini-spot well pattern |
| CN208473829U (en) * | 2018-05-23 | 2019-02-05 | 中国石油天然气股份有限公司 | Combine well pattern structure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111749660B (en) | 2022-06-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102777157A (en) | CO2 drive oil-gas-water separate well injecting oil reservoir mixing drive development method | |
| CN105822271A (en) | Adjustment method of variable flow line vector of thick-stratum oil deposit | |
| CN206309375U (en) | The improvement well pattern structure of rhombic inverted nini-spot well pattern | |
| CN109281642B (en) | Method for improving multi-layer oil reservoir development effect after polymer flooding | |
| CN111322056A (en) | Continental facies shale gas development well type determination method and device | |
| Chen et al. | Improving Polymerflood Performance Via Streamline-Based Rate Optimization: Mangala Field, India | |
| CN104373097A (en) | Method for increasing middle and deep layer super heavy oil deposit recovery ratio through combination of SAGD and steam flooding | |
| US3143169A (en) | Secondary recovery method for petroleum by fluid displacement | |
| CN111749660B (en) | Well pattern injection and production method and device | |
| Srochviksit et al. | Simulation on heavy oil production from steam-flooding | |
| US3393735A (en) | Interface advance control in pattern floods by use of control wells | |
| CN107448179A (en) | A kind of CO2- water alternately injects the method and its application of purging | |
| CN111749671B (en) | Method and device for injection-production between development layers of well pattern | |
| CN107869334B (en) | Layer system recombination and exploitation method of multi-layer sandstone oil reservoir in middle and later stages of water injection development | |
| CN112302608A (en) | Horizontal well pre-pressure injection fluid development method based on three-dimensional fracturing well pattern | |
| Ambrose et al. | Facies heterogeneity, pay continuity, and infill potential in barrier-island, fluvial, and submarine-fan reservoirs: Examples from the Texas Gulf Coast and Midland Basin | |
| RU2579039C1 (en) | Method for development of low-permeability oil-gas formations | |
| CN103628848A (en) | Multidirectional interlayer water flooding displacement oil extraction method and system | |
| CN111749657B (en) | Well pattern layered mining method and device | |
| CN102913203B (en) | Method for developing low-permeability gas reservoir | |
| CN113006749B (en) | Coal series associated resource one-well multipurpose coordinated mining method | |
| US3380525A (en) | 7-well delta pattern for secondary recovery | |
| CN206309377U (en) | Improvement well pattern structure based on rhombic inverted nini-spot well pattern | |
| CN115506759A (en) | CO (carbon monoxide) 2 Optimization method of surfactant alternating injection parameters and application of optimization method in medium-high permeability oil reservoir | |
| CN112627797A (en) | Development system for special-shaped pinnate geothermal well |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |