CN112443302A - SAGD production method - Google Patents
SAGD production method Download PDFInfo
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- CN112443302A CN112443302A CN201910803546.3A CN201910803546A CN112443302A CN 112443302 A CN112443302 A CN 112443302A CN 201910803546 A CN201910803546 A CN 201910803546A CN 112443302 A CN112443302 A CN 112443302A
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- steam injection
- well
- interlayer
- production method
- injection well
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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
- E21B43/2406—Steam assisted gravity drainage [SAGD]
Abstract
The invention provides an SAGD production method which comprises the steps of pumping expansion liquid into a steam injection well at high pressure until the expansion liquid penetrates through an interlayer around the steam injection well before a starting stage, and simultaneously injecting steam into the steam injection well and a production well at high pressure in a circulating mode after the expansion liquid penetrates through the interlayer. The invention solves the problem that the shale interlayer in the prior art restricts the yield of the SAGD well group.
Description
Technical Field
The invention relates to the technical field of oil reservoir exploitation, in particular to a SAGD production method.
Background
The SAGD technology is an effective technology for exploiting a shallow super heavy oil reservoir at present, SAGD development is divided into a starting stage and a production stage, the starting stage is the basis of the production stage, and the effect of the production stage is directly influenced by the quality of the starting stage. Through years of exploration and practice, a method for shortening the starting time and saving the steam consumption in the starting process is formed, but for oil reservoirs with strong reservoir heterogeneity, an effective method for improving the development effect of the initial stage of pumping is not provided for a moment.
In recent years, with the continuous expansion of SAGD development scale, development positions gradually turn to areas with poor reservoir properties, the areas have the characteristics of high viscosity, low permeability and strong heterogeneity, great influence is caused to SAGD starting and production, development of shale interlayers of part of the reservoir, particularly interlayers above steam injection wells, greatly restrict development of steam cavities, and yield of SAGD well groups is closely related to development conditions of the steam cavities, so that the shale interlayers in the area close to the well of the reservoir block upward development of the steam cavities, the oil reservoir utilization volume is reduced, and yield of the SAGD well groups is restricted.
Disclosure of Invention
The invention mainly aims to provide an SAGD production method, and aims to solve the problem that the shale interlayer in the prior art restricts the yield of an SAGD well group.
In order to achieve the purpose, the invention provides an SAGD production method which comprises the steps of pumping expansion liquid into a steam injection well at high pressure until the expansion liquid penetrates through an interlayer around the steam injection well before a start-up stage, and simultaneously injecting steam into the steam injection well and a production well in a high-pressure circulation mode after the expansion liquid penetrates through the interlayer.
Further, the flash liquid is hot water.
Further, the flash liquid is a liquid having a high viscosity.
Further, the expansion liquid is hot sewage.
Further, when the capacity expansion liquid is pumped into the steam injection well at a high pressure, the areas of the volume expansion areas formed in the reservoir and the interlayer are monitored, and the size of the volume expansion areas and the breakdown condition of the interlayer are analyzed and judged in real time.
And further, when a gap penetrating through the interlayer in the vertical direction appears on the interlayer, stopping pumping the expansion liquid into the steam injection well.
Further, when steam is injected into the steam injection well and the production well simultaneously in a high-pressure cycle, the steam injection pressure is controlled according to the principle that the steam injection pressure is close to and higher than the minimum principal stress.
Further, the starting pressure of the steam injection well and the production well is controlled to be 0.5-1.0MPa higher than the standard starting pressure and 0.4-0.6MPa lower than the reservoir fracture pressure.
Further, controlling the pressure difference between the steam injection well and the production well to be 0.2-0.4 MPa.
Further, the oil well which is located above the steam injection well and is located in the near-wellbore region of the steam injection well is selected to adopt the SAGD production method.
By applying the technical scheme of the invention, the expansion liquid is pumped into the steam injection well at high pressure, the expansion liquid expands along the radial crack in the steam injection well and moves to the interlayer, and the high-pressure expansion liquid applies pressure to the interlayer, so that the interlayer is broken down under the pressure action of the expansion liquid, and thus, when the starting stage and the production stage are carried out subsequently, steam can pass through the interlayer to extend upwards to develop and form a steam cavity with larger volume, thereby realizing the rapid development of the steam cavity, improving the production effect of the well group, simultaneously further enriching and perfecting SAGD starting technical series, laying a foundation for realizing the efficient development of SAGD, and accumulating experience for the popularization and application of the technology in the field of shallow super heavy oil. The method utilizes the geomechanics dilatation principle of the weakly consolidated oil sand reservoir to break the uneven mudstone interlayer and improve the oil reservoir physical parameters such as porosity, permeability and the like of the reservoir above the steam injection well, thereby improving the fluidity of steam, increasing the flow capacity of the steam above the reservoir, promoting the steam cavity to develop towards the upper part of the steam injection well, weakening the restriction of the interlayer on the development of the steam cavity and achieving the purpose of improving the oil production level in the initial stage of pumping.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 shows a flow diagram of a SAGD production process of the present invention;
FIG. 2 shows a steam injection leveling curve for a well group utilizing the SAGD production method of the present invention versus a conventional SAGD start-up well group; and
FIG. 3 shows a leveling out curve of oil production for a well string utilizing the SAGD production method of the present invention versus a conventional SAGD start-up well string.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
It is noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
In the present invention, unless specified to the contrary, use of the terms of orientation such as "upper, lower, top, bottom" or the like, generally refer to the orientation as shown in the drawings, or to the component itself in a vertical, perpendicular, or gravitational orientation; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.
In order to solve the problem that the shale interlayer in the prior art restricts the yield of an SAGD well group, the invention provides an SAGD production method.
As shown in fig. 1, the SAGD production method provided in this embodiment includes pumping an expansion liquid into the steam injection well at a high pressure until the expansion liquid penetrates through an interlayer around the steam injection well before a start-up phase, and injecting steam into the steam injection well and the production well simultaneously in a high-pressure circulation manner after the expansion liquid penetrates through the interlayer.
The embodiment pumps the dilatation liquid into the steam injection well through high pressure, the dilatation liquid expands along the radial crack in the steam injection well, and move to the interlayer, high-pressure dilatation liquid exerts pressure on the interlayer, thereby the interlayer is punctured under the pressure effect of the dilatation liquid, and thus, when the starting stage and the production stage are carried out subsequently, steam can pass through the interlayer to extend upwards to develop and form a steam cavity with a large volume, so that the rapid development of the steam cavity is realized, the production effect of the well group is improved, meanwhile, the SAGD starting technology series are further enriched and perfected, a foundation is laid for realizing the efficient development of the SAGD, and the experience is also accumulated for the popularization and application of the technology in the field of shallow super heavy oil. The method utilizes the geomechanics dilatation principle of the weakly consolidated oil sand reservoir to break the uneven mudstone interlayer and improve the oil reservoir physical parameters such as porosity, permeability and the like of the reservoir above the steam injection well, thereby improving the fluidity of steam, increasing the flow capacity of the steam above the reservoir, promoting the steam cavity to develop towards the upper part of the steam injection well, weakening the restriction of the interlayer on the development of the steam cavity and achieving the purpose of improving the oil production level in the initial stage of pumping.
It should be noted that the SAGD production method of this embodiment is directed to the interlayer of the near wellbore region above the steam injection well, so that it can be ensured that the expansion liquid breaks through the interlayer stably and reliably. Therefore, when the method is implemented, the geological reservoir conditions around the well group need to be detected in advance, the interlayer is selected to be positioned above the steam injection well, and the oil well positioned in the near-well region of the steam injection well adopts the SAGD production method to perform the breakdown transformation treatment on the interlayer.
Optionally, the flash liquid is hot water, or a liquid having a high viscosity. Preferably, the actual environment of the production site is combined, and the hot sewage is selected as the expansion solution, so that the products on the site are reasonably utilized, and the expansion solution does not need to be prepared independently.
In this embodiment, when the expansion solution is pumped into the steam injection well at a high pressure, the expansion solution can form a large-area volume expansion region in the oil sand reservoir and the shale interlayer, the area of the volume expansion region formed in the reservoir and the interlayer is monitored in real time on site, and the size of the volume expansion region and the breakdown condition of the interlayer are analyzed and judged in real time, so that the optimal transformation effect is achieved. After the transformation is finished, namely after the expansion liquid is monitored to break down the interlayer, steam is injected into the steam injection well and the production well simultaneously in a high-pressure circulation mode to carry out a starting stage, the steam injection pressure is controlled according to the principle that the steam injection pressure is close to and higher than the minimum main stress, the field steam injection parameters are optimized, and the transformation effect is guaranteed. After the start-up phase is completed, the normal production phase can be carried out.
In the embodiment, the expansion liquid is adopted to perform breakdown transformation on the interlayer, so that the subsequent starting stage is different from the conventional starting stage, specifically, after the reservoir transformation is completed, the starting stage is performed, the starting pressure of the steam injection well and the production well is controlled to be higher than the standard starting pressure by 0.5-1.0MPa and lower than the reservoir fracture pressure by 0.4-0.6MPa in the starting stage, and the inter-well pressure difference between the steam injection well and the production well is controlled to be 0.2-0.4 MPa. The standard starting pressure is the conventional starting pressure of the well group before reservoir transformation is carried out, and the starting pressure needs to be higher than the conventional starting pressure to ensure the steam circulation effect because the reservoir transformation is carried out.
Through practical tests, compared with a well group which does not adopt the method, when the SAGD production method is adopted to modify the reservoir of the well group, after the modified well group is started, the steam injection capacity in the initial pumping stage is obviously increased, as shown in figure 2, the steam injection level of the well group which is not started by the method is averagely increased by 16t/d compared with that of the well group which is not started by the method, and the initial yield is obviously increased, as shown in figure 3, the oil production level is increased by 2.47t/d compared with that in the same period, the aim of improving the oil production level in the initial SAGD production stage is fulfilled, meanwhile, as the steam cavity is developed faster, the well group is produced stably, the regulation and control times of the well group are effectively reduced, and the workload of workers is reduced.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:
1. the problem that the shale interlayer in the prior art restricts the yield of the SAGD well group is solved;
2. the rapid development of the steam cavity is realized, and the production effect of the well group is improved;
3. the well group is stable in production, the regulation and control times of the well group are effectively reduced, and the workload of workers is reduced.
It is to be understood that the above-described embodiments are only a few, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The SAGD production method is characterized by comprising the steps of pumping expansion liquid into a steam injection well at high pressure until the expansion liquid penetrates through an interlayer around the steam injection well before a start-up stage, and simultaneously injecting steam into the steam injection well and a production well in a high-pressure circulation mode after the expansion liquid penetrates through the interlayer.
2. The SAGD production method of claim 1, wherein the flash liquid is hot water.
3. The SAGD production method according to claim 1, wherein the flash liquid is a liquid having a high viscosity.
4. The SAGD production method of claim 1, wherein the flash liquid is hot sewage.
5. The SAGD production method of claim 1, wherein areas of volume-enlarged areas formed in a reservoir and the interlayer are monitored and analyzed in real time to determine the size of the volume-enlarged areas and the breakdown of the interlayer while the volume-enlarged liquid is pumped into the steam injection well at a high pressure.
6. The SAGD production method of claim 5, wherein pumping of the expansion solution into the steam injection well is stopped when a gap in the interlayer that extends vertically through the interlayer occurs.
7. The SAGD production method of claim 1, wherein when steam is injected into the steam injection well and the production well simultaneously in a high pressure cycle, the steam injection pressure is controlled on the principle that the steam injection pressure is close to and higher than the minimum principal stress.
8. The SAGD production method of claim 7, wherein the start-up pressure of the steam injection well and the production well is controlled to be 0.5-1.0MPa above the standard start-up pressure and 0.4-0.6MPa below the reservoir fracture pressure.
9. The SAGD production method of claim 8, wherein an interwell pressure differential between the steam injection well and the production well is controlled to be 0.2-0.4 MPa.
10. The SAGD production method of claim 1, wherein the interlayer is selected to be located above the steam injection well and the oil well located near the well bore of the steam injection well is to be subjected to the SAGD production method.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910803546.3A CN112443302A (en) | 2019-08-28 | 2019-08-28 | SAGD production method |
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| CN201910803546.3A CN112443302A (en) | 2019-08-28 | 2019-08-28 | SAGD production method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105178931A (en) * | 2015-09-06 | 2015-12-23 | 中国石油天然气股份有限公司 | Method for increasing initial production speed of SAGD (Steam Assisted Gravity Drainage) |
| CN106593367A (en) * | 2015-10-14 | 2017-04-26 | 中国石油天然气股份有限公司 | Start method for steam-assisted gravity drainage of heavy oil reservoir |
| WO2017131850A1 (en) * | 2015-12-01 | 2017-08-03 | Conocophillips Company | Single well cross steam and gravity drainage (sw-xsagd) |
| CN108119113A (en) * | 2016-11-30 | 2018-06-05 | 中国石油天然气股份有限公司 | The method of heavy crude producing |
-
2019
- 2019-08-28 CN CN201910803546.3A patent/CN112443302A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105178931A (en) * | 2015-09-06 | 2015-12-23 | 中国石油天然气股份有限公司 | Method for increasing initial production speed of SAGD (Steam Assisted Gravity Drainage) |
| CN106593367A (en) * | 2015-10-14 | 2017-04-26 | 中国石油天然气股份有限公司 | Start method for steam-assisted gravity drainage of heavy oil reservoir |
| WO2017131850A1 (en) * | 2015-12-01 | 2017-08-03 | Conocophillips Company | Single well cross steam and gravity drainage (sw-xsagd) |
| CN108119113A (en) * | 2016-11-30 | 2018-06-05 | 中国石油天然气股份有限公司 | The method of heavy crude producing |
Non-Patent Citations (1)
| Title |
|---|
| 孙新革等: "陆相浅层超稠油SAGD 提质增效技术体系研究", 《2018油气田勘探与开发国际会议（IFEDC 2018）论文集》 * |
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