CN113847003A - Method for uniformly using horizontal section of thickened oil horizontal well - Google Patents
Method for uniformly using horizontal section of thickened oil horizontal well Download PDFInfo
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- CN113847003A CN113847003A CN202010598992.8A CN202010598992A CN113847003A CN 113847003 A CN113847003 A CN 113847003A CN 202010598992 A CN202010598992 A CN 202010598992A CN 113847003 A CN113847003 A CN 113847003A
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- oil
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- horizontal 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
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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
- E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
- E21B43/168—Injecting a gaseous medium
Abstract
The invention provides a method for uniformly using a horizontal section of a thickened oil horizontal well. The method for uniformly using the horizontal section of the thickened oil horizontal well comprises the following steps: selecting a heavy oil reservoir, drilling a horizontal well in the heavy oil reservoir, and establishing a synchronous injection-production pipe column structure; injecting steam into the synchronous injection-production tubular column structure, performing steam huff-puff, and establishing a temperature field around a shaft of the horizontal well; one oil pipe in the synchronous injection-production pipe column structure is set as a gas injection pipe, the other oil pipe is set as a production pipe, and the two oil pipes are produced simultaneously. The invention solves the problem of poor exploitation effect of the thick oil horizontal well in the prior art.
Description
Technical Field
The invention relates to the field of oil exploitation, in particular to a method for uniformly using a horizontal section of a thick oil horizontal well.
Background
In the exploitation of a heavy oil reservoir horizontal well, steam huff and puff is mainly used, the application range is wide, the economic benefit is good, and the method can be applied to areas where conventional vertical well development is difficult to achieve. Because the contact area of the horizontal section and the oil reservoir is large, the horizontal section theoretically has larger sweep efficiency and oil extraction speed, but the reservoir heterogeneity of the oil reservoir per se is widely existed, and in addition, the interference of flow pressure difference along the horizontal section is caused, the development of the horizontal well is often influenced by the uneven utilization of the horizontal section, the effect is limited, the utilization rate of the horizontal section is generally only 30-60%, various measures are needed to be taken in the later stage to enhance the utilization and the extraction of residual oil, and the cost is greatly increased.
Therefore, the problem of poor exploitation effect of the thickened oil horizontal well exists in the prior art.
Disclosure of Invention
The invention mainly aims to provide a method for uniformly using a horizontal section of a thick oil horizontal well, which aims to solve the problem of poor exploitation effect of the thick oil horizontal well in the prior art.
In order to achieve the above object, according to an aspect of the present invention, there is provided a method for uniform horizontal segment exploitation of a thick oil horizontal well, comprising: selecting a heavy oil reservoir, drilling a horizontal well in the heavy oil reservoir, and establishing a synchronous injection-production pipe column structure; injecting steam into the synchronous injection-production tubular column structure, performing steam huff-puff, and establishing a temperature field around a shaft of the horizontal well; one oil pipe in the synchronous injection-production pipe column structure is set as a gas injection pipe, the other oil pipe is set as a production pipe, and the two oil pipes are produced simultaneously.
Furthermore, the method for selecting the heavy oil reservoir is to select the reservoir with the oil layer thickness more than 5 meters as the heavy oil reservoir.
Further, a method of drilling a horizontal well includes establishing a plurality of branch structures.
Further, the method of establishing the branch structure includes that the azimuth angle of the borehole of the branch structure is the same as the borehole azimuth angle of the horizontal well.
Further, the method for establishing the branch structure comprises the step of enabling the distance between the end of the borehole of the branch structure and the top of the oil layer of the heavy oil reservoir to be larger than or equal to 1 meter.
Further, the method for establishing the synchronous injection-production tubular column structure comprises the following steps: the gas injection pipe and the oil production pipe are provided with at least one punching and steam distributing short section and a blind pipe section, the punching and steam distributing short section of the gas injection pipe corresponds to the blind pipe section of the oil production pipe, and the blind pipe section of the gas injection pipe corresponds to the punching and steam distributing short section of the oil production pipe.
Further, the method for establishing the branch structure further comprises the following steps: the branch structure at least spans one of the perforating steam distribution short section and the dead pipe section.
Further, the method for establishing the synchronous injection-production tubular column structure further comprises the following steps: and arranging high-temperature packers at the adjacent punching steam distribution short section and the dead pipe section so as to separate the punching steam distribution short section from the dead pipe section.
Further, the method for simultaneously producing two oil pipes comprises the following steps: the injection-production ratio of the gas injection pipe to the oil production pipe is more than or equal to 1 and less than or equal to 1.2.
Further, the method for simultaneously producing two oil pipes comprises the following steps: and when the extraction degree is more than 35%, injecting a non-condensable gas slug into the gas injection pipe.
By applying the technical scheme of the invention, the method for uniformly using the horizontal section of the thickened oil horizontal well comprises the following steps: selecting a heavy oil reservoir, drilling a horizontal well in the heavy oil reservoir, and establishing a synchronous injection-production pipe column structure; injecting steam into the synchronous injection-production tubular column structure, performing steam huff-puff, and establishing a temperature field around a shaft of the horizontal well; one oil pipe in the synchronous injection-production pipe column structure is set as a gas injection pipe, the other oil pipe is set as a production pipe, and the two oil pipes are produced simultaneously.
By using the method for uniformly using the horizontal section of the thickened oil horizontal well, the using degree of the horizontal section can be greatly improved, single-well synchronous steam injection and oil extraction are realized in the production process, the problems of steam channeling and the like caused by multi-well combined injection and extraction are avoided, and the comprehensive benefit is improved.
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 illustrates a flow chart of a method for uniform draw of a horizontal section of a thick oil horizontal well according to one embodiment of the present invention;
FIG. 2 is a schematic diagram showing the position relationship among the perforated steam distribution short segment, the dead leg and the high temperature packer in the present application.
Wherein the figures include the following reference numerals:
10. punching and steam distributing short sections; 20. a dead leg section; 30. a high temperature packer.
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 exploitation effect of a thickened oil horizontal well is poor in the prior art, the application provides a method for uniformly utilizing the horizontal section of the thickened oil horizontal well.
As shown in fig. 1, the method for uniformly utilizing the horizontal section of the thick oil horizontal well in the present application includes: selecting a heavy oil reservoir, drilling a horizontal well in the heavy oil reservoir, and establishing a synchronous injection-production pipe column structure; injecting steam into the synchronous injection-production tubular column structure, performing steam huff-puff, and establishing a temperature field around a shaft of the horizontal well; one oil pipe in the synchronous injection-production pipe column structure is set as a gas injection pipe, the other oil pipe is set as a production pipe, and the two oil pipes are produced simultaneously.
By using the method for uniformly using the horizontal section of the thickened oil horizontal well, the using degree of the horizontal section can be greatly improved, single-well synchronous steam injection and oil extraction are realized in the production process, the problems of steam channeling and the like caused by multi-well combined injection and extraction are avoided, and the comprehensive benefit is improved.
Specifically, the method for selecting the heavy oil reservoir is to select the reservoir with the oil layer thickness more than 5 meters as the heavy oil reservoir.
Specifically, a method of drilling a horizontal well includes establishing a plurality of branch structures. In the process, branches are required to be drilled in a main borehole of the horizontal well, and the number of the branches is determined according to the length of the horizontal segment and the heterogeneity of the reservoir.
Specifically, the method for establishing the branch structure comprises the step of enabling the azimuth angle of a borehole of the branch structure to be the same as the azimuth angle of the borehole of the horizontal well.
Specifically, the method for establishing the branch structure comprises the step of enabling the distance between the end of a borehole of the branch structure and the top of an oil layer of the heavy oil reservoir to be larger than or equal to 1 meter. It is also noted that the well bore of the branched structure is completed in an open hole.
Specifically, the method for establishing the synchronous injection-production tubular column structure comprises the following steps: the gas injection pipe and the oil production pipe are both provided with at least one punching steam distribution short section 10 and a dead leg section 20, the punching steam distribution short section 10 of the gas injection pipe corresponds to the dead leg section 20 of the oil production pipe, and the dead leg section 20 of the gas injection pipe corresponds to the punching steam distribution short section 10 of the oil production pipe. It should be noted that, when the gas injection pipe and the oil production pipe both have a plurality of perforated steam distribution short sections 10 and dead legs 20, the plurality of perforated steam distribution short sections 10 and dead legs 20 are alternately arranged, that is, there is a dead leg 20 between adjacent perforated steam distribution short sections 10 or a perforated steam distribution short section 10 between adjacent dead legs 20.
Specifically, the method for establishing a branch structure further includes: the branch structure at least spans one of the perforated steam distribution short segment 10 and the dead leg 20. In one embodiment of the present application, the perforated steam distribution stub section 10 and the dead leg 20 spanned by the branch structure are adjacent perforated steam distribution stub sections 10 and dead legs 20 on the production string.
Specifically, the method for establishing the synchronous injection-production tubular column structure further comprises the following steps: and arranging high-temperature packers 30 at the adjacent perforated steam distribution short section 10 and the dead pipe section 20 so as to separate the perforated steam distribution short section 10 from the dead pipe section 20.
In the application, when steam is injected into the synchronous injection-production tubular column structure, two oil pipes simultaneously inject steam for 1-3 times of huffing and puff, a temperature field around a shaft is established, the tubular column with the perforating and steam distributing short section 10 and the branch starting point positioned on the same side is operated at a high steam volume and a high pressure which is 0.5MPa lower than the reservoir fracture pressure, and the reservoir seepage capacity and the thermal field around the branch are enhanced.
Specifically, the method for simultaneously producing two oil pipes comprises the following steps: the injection-production ratio of the gas injection pipe to the oil production pipe is more than or equal to 1 and less than or equal to 1.2. Through the arrangement, the stable production of the horizontal well can be ensured.
Further, the method for simultaneously producing two oil pipes comprises the following steps: when the extraction degree is more than 35%, a non-condensable gas slug is injected into the gas injection pipe, so that the transverse expansion of the steam cavity is strengthened, the heat loss is reduced, and the overall development benefit is improved until the production is finished.
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 of poor exploitation effect of a thick oil horizontal well in the prior art is solved;
2. can ensure the stable production of the horizontal well.
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 method for uniformly using the horizontal section of the thickened oil horizontal well is characterized by comprising the following steps of:
selecting a heavy oil reservoir, drilling a horizontal well in the heavy oil reservoir, and establishing a synchronous injection-production tubular column structure;
injecting steam into the synchronous injection-production tubular column structure, performing steam huff-puff, and establishing a temperature field around a shaft of the horizontal well;
and setting one oil pipe in the synchronous injection-production pipe column structure as a gas injection pipe, setting the other oil pipe as an oil production pipe, and simultaneously producing the two oil pipes.
2. The method for uniformly exploiting the horizontal section of the heavy oil horizontal well according to claim 1, wherein the method for selecting the heavy oil reservoir is to select a reservoir with an oil layer thickness of more than 5m as the heavy oil reservoir.
3. The method for uniform mobilization of a horizontal segment of a thick oil horizontal well according to claim 1, wherein the method of drilling the horizontal well comprises establishing a plurality of leg structures.
4. The method for uniform mobilization of a horizontal section of a thick oil horizontal well according to claim 3, wherein the method for establishing the lateral structure comprises an azimuth of a wellbore of the lateral structure being the same as an azimuth of a wellbore of the horizontal well.
5. The method for uniform mobilization of a horizontal section of a heavy oil horizontal well according to claim 3, wherein the method for establishing the branch structure comprises a distance between a wellbore end of the branch structure and a top of an oil layer of the heavy oil reservoir being greater than or equal to 1 meter.
6. The method for uniformly mobilizing the horizontal section of the thick oil horizontal well according to any one of claims 3 to 5, wherein the method for establishing the synchronous injection-production string structure comprises the following steps:
the gas injection pipe and the oil production pipe are both provided with at least one punching steam distribution short section (10) and a dead leg (20), the punching steam distribution short section (10) of the gas injection pipe corresponds to the dead leg (20) of the oil production pipe, and the dead leg (20) of the gas injection pipe corresponds to the punching steam distribution short section (10) of the oil production pipe.
7. The method for uniform mobilization of a horizontal section of a thick oil horizontal well according to claim 6, wherein the method for establishing the branching structure further comprises:
the branch structure at least spans one of the perforation steam distribution short segment (10) and the dead leg (20).
8. The method for uniformly mobilizing the horizontal section of the thick oil horizontal well according to claim 6, wherein the method for establishing the synchronous injection-production string structure further comprises the following steps:
and arranging high-temperature packers (30) at the adjacent perforated steam distribution short section (10) and the dead pipe section (20) so as to separate the perforated steam distribution short section (10) and the dead pipe section (20).
9. The method for uniformly mobilizing the horizontal section of the thick oil horizontal well according to any one of claims 1 to 5, wherein the method for simultaneously producing two oil pipes comprises the following steps:
and the injection-production ratio of the gas injection pipe to the oil production pipe is more than or equal to 1 and less than or equal to 1.2.
10. The method for uniformly mobilizing the horizontal section of the thick oil horizontal well according to any one of claims 1 to 5, wherein the method for simultaneously producing two oil pipes comprises the following steps:
and when the extraction degree is more than 35%, injecting a non-condensable gas slug into the gas injection pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010598992.8A CN113847003A (en) | 2020-06-28 | 2020-06-28 | Method for uniformly using horizontal section of thickened oil horizontal well |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010598992.8A CN113847003A (en) | 2020-06-28 | 2020-06-28 | Method for uniformly using horizontal section of thickened oil horizontal well |
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| US20180135392A1 (en) * | 2015-12-01 | 2018-05-17 | Conocophillips Company | Single Well Cross Steam And Gravity Drainage (SW-XSAGD) |
| US20190242225A1 (en) * | 2018-02-02 | 2019-08-08 | China University Of Petroleum (East China) | Method for extracting tight oil by converting carbon dioxide huffing-puffing to carbon dioxide flooding |
| CN110295879A (en) * | 2018-03-23 | 2019-10-01 | 熊暮羽 | A kind of staged fracturing horizontal well in segments period note adopts dual string |
| CN110630234A (en) * | 2018-06-21 | 2019-12-31 | 中国石油天然气股份有限公司 | Steam injection method for heavy oil thermal recovery well |
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2020
- 2020-06-28 CN CN202010598992.8A patent/CN113847003A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CA2162741A1 (en) * | 1995-04-11 | 1996-10-12 | Ben Ifeanyi Nzekwu | Single horizontal wellbore gravity drainage assisted steam flood process and apparatus |
| CN101592028A (en) * | 2008-05-28 | 2009-12-02 | 中国石油天然气股份有限公司 | The method of the super viscous crude of the auxiliary SAGD exploitation of a kind of gas |
| US20120043081A1 (en) * | 2009-02-13 | 2012-02-23 | Statoil Asa | Single well steam assisted gravity drainage |
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| US20180135392A1 (en) * | 2015-12-01 | 2018-05-17 | Conocophillips Company | Single Well Cross Steam And Gravity Drainage (SW-XSAGD) |
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| CN110630234A (en) * | 2018-06-21 | 2019-12-31 | 中国石油天然气股份有限公司 | Steam injection method for heavy oil thermal recovery well |
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