CN115012890A - Steam pressure flooding oil extraction method for shallow and thin layer super heavy oil - Google Patents
Steam pressure flooding oil extraction method for shallow and thin layer super heavy oil Download PDFInfo
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- CN115012890A CN115012890A CN202110237408.0A CN202110237408A CN115012890A CN 115012890 A CN115012890 A CN 115012890A CN 202110237408 A CN202110237408 A CN 202110237408A CN 115012890 A CN115012890 A CN 115012890A
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- 239000003921 oil Substances 0.000 title claims abstract description 42
- 239000000295 fuel oil Substances 0.000 title claims abstract description 19
- 238000000605 extraction Methods 0.000 title claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 claims abstract description 14
- 238000002791 soaking Methods 0.000 claims abstract description 8
- 238000002347 injection Methods 0.000 claims description 15
- 239000007924 injection Substances 0.000 claims description 15
- 238000010793 Steam injection (oil industry) Methods 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 5
- 238000011084 recovery Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 4
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 26
- 229910052757 nitrogen Inorganic materials 0.000 description 13
- 238000010795 Steam Flooding Methods 0.000 description 5
- 239000010779 crude oil Substances 0.000 description 5
- 230000000737 periodic effect Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000005191 phase separation Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000009671 shengli Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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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- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
The invention relates to the technical field of heavy oil reservoir development, in particular to a shallow and thin super heavy oil steam pressure flooding oil extraction method. The method comprises the following steps: step 1, deploying a horizontal well; step 2, injecting a large amount of steam into the horizontal well rapidly to form multi-directional uniform cracks around the horizontal well; step 3, soaking the well; and 4, opening the well for production, reducing the oil quantity to 1t/d, and returning to the step 2. According to the method, a large amount of steam is injected quickly, multi-direction uniform volume cracks are formed around the horizontal well, the steam sweep range is expanded, the heating radius is expanded, the recovery ratio is improved, and the effect is obvious. The method disclosed by the invention is simple in steps, has better operability and practicability, and is beneficial to popularization and application.
Description
Technical Field
The invention relates to the technical field of heavy oil reservoir development, in particular to a shallow and thin super heavy oil steam pressure flooding oil extraction method.
Background
Shengli oil field with thick oil reserve of 6.4X 10 8 t, wherein the east oil area is proved to have the geological reserve of thick oil of 5.89 multiplied by 10 8 t, has used 4.69X 10 8 t; the western oil area successively finds out the oil fields of spring wind and spring shine with the geological reserves of 1.37 multiplied by 10 8 t, is 5335X 10 4 t. In the current moved and un-moved reserves, more than 80 percent of the oil is super heavy oil-extra super heavy oil reservoir, which is an important position for stable output in later period.
For the exploitation of shallow thin-layer super heavy oil reservoirs, the chinese patent application CN109424340A discloses a method for exploiting shallow thin-layer super heavy oil by nitrogen injection, which comprises: (1) drilling: drilling at least one vertical well on the surface of the super heavy oil distribution area, and completing the well by adopting a heat-insulating sleeve; (2) preparing nitrogen; (3) supercharging: pressurizing the nitrogen by adopting a nitrogen booster so that the nitrogen pressure at the outlet of the nitrogen booster is greater than the formation pressure of the thick oil reservoir and less than the fracture pressure of the thick oil reservoir; (4) heating: introducing the pressurized nitrogen into a nitrogen heater to enable the temperature of the nitrogen to be higher than the temperature required by viscosity reduction of the thick oil; (5) nitrogen injection and viscosity reduction: performing real-time control on the nitrogen injection speed, the injection temperature and the injection pressure through a ground control system, and slowly injecting the required nitrogen into the heavy oil reservoir for viscosity reduction; (6) separation: pumping the mixture containing the thickened oil, the nitrogen, the hydrocarbon gas and the water after viscosity reduction to the ground surface through a vertical well, cooling and then leading the mixture to a three-phase separation device for separation. The method has the obvious advantages of environmental protection, high efficiency, full utilization of energy and the like, but the steps are more complicated.
At present, spring wind oil fields are mainly developed by methods such as HDNS, VDNS, HNS, HDS, VNS and the like, and a good development effect is obtained, for example, Chinese invention patent CN107664031B discloses a method for improving recovery efficiency by determining a horizontal well steam flooding well pattern form, which comprises the following steps: step 1, selecting physical property parameters of a horizontal well steam flooding oil layer; step 2, optimizing and deploying a horizontal well; step 3, adopting an HDCS or HDNS mode to steam for huff and puff before driving; step 4, determining the steam flooding well pattern form of the horizontal well; step 5, determining the steam driving and rotating driving time; and 6, determining other parameters of the steam flooding, and carrying out steam flooding development. However, because the viscosity of crude oil is high, the mobility radius is small, the residual oil between wells is enriched, and with the increase of the huff and puff turns, the formation energy is low, the decrement rate is large, and the production degree is low.
Disclosure of Invention
In order to improve the extraction degree of an ultra-heavy oil reservoir, the invention provides an ultra-heavy oil steam pressure flooding oil extraction method. The method can effectively improve the oil reservoir utilization range of the super heavy oil, improve the single well productivity and improve the crude oil recovery ratio.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a super heavy oil steam pressure flooding oil extraction method, which comprises the following steps:
step 1, deploying a horizontal well;
step 3, soaking the well;
and 4, opening the well for production, reducing the oil quantity to 1t/d, and returning to the step 2.
Further, in step 1, a horizontal well is deployed in the middle or the middle lower part of the reservoir oil layer.
Further, in step 2, the steam dryness of the gas injection well needs to be more than 0.5.
Furthermore, the steam injection speed of the steam injection well is 1000-1500t/d, and the periodic injection amount is 15000-20000 t.
Further, in the step 3, the soaking time is 3-5 days.
Further, in step 4, the liquid extraction speed is more than 100 t/d.
Compared with the prior art, the invention has the following advantages:
according to the method, a large amount of steam is injected quickly, multi-direction uniform volume cracks are formed around the horizontal well, the steam sweep range is expanded, the heating radius is expanded, the recovery ratio is improved, and the effect is obvious.
The method disclosed by the invention is simple in steps, has better operability and practicability, and is beneficial to popularization and application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a flow chart of a vapor pressure flooding oil recovery method for shallow and thin layer ultra-heavy oil according to example 1 of the present invention;
fig. 2 is a graph of the driving and producing degree of the shallow and thin layer heavy oil according to embodiment 2 of the present invention.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, 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 invention belongs.
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 exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the stated features, steps, operations, and/or combinations thereof, unless the context clearly indicates otherwise.
In order to make the technical solutions of the present invention more clearly understood by those skilled in the art, the technical solutions of the present invention will be described in detail below with reference to specific embodiments.
Example 1
As shown in fig. 1, the vapor pressure drive development method of the shallow thin layer ultra-thick oil comprises the following steps:
in step 101, 1 horizontal well is deployed, located in the middle of the reservoir.
The flow proceeds to step 102.
In step 102, the steam injection dryness of the steam injection well is greater than 0.5, the injection speed is high, the injection amount is large, and the injected steam is ensured to form multi-directional uniform volume cracks around the horizontal well. The steam injection speed of the steam injection well is 1000t/d, and the periodic injection amount is 15000 t.
The flow proceeds to step 103.
In step 103, after the steam is injected, the well is shut in, and the steam is allowed to react with the crude oil in the reservoir. Soaking for 3 days.
In step 104, after the well is stewed, the well is opened and recovered, the heat is utilized to quickly recover, and the liquid extraction speed is more than 100 t/d. And when the daily oil production is lower than 1t/d, returning to the step 102 and starting a new production round.
Example 2
The vapor pressure flooding development method of the shallow thin-layer super-thick oil comprises the following steps of:
step 1, deploying a horizontal well and locating the horizontal well at the middle lower part of an oil layer.
And 2, the steam dryness of the steam injection well is greater than 0.5, the injection speed is high, the injection amount is large, and the injected steam is ensured to form multi-direction uniform volume cracks around the horizontal well. The steam injection speed of the steam injection well is 1500t/d, and the periodic injection amount is 15000 t.
And 3, closing the well after the steam is injected, and allowing the steam to fully react with the crude oil in the oil reservoir. And soaking for 5 days.
And 4, after soaking for 5 days, opening the well and recovering, quickly recovering by utilizing heat, wherein the liquid recovery speed is 150t/d, and when the daily oil production is lower than 1t/d, returning to the step 102, and re-injecting steam to start a new round of production.
The effect of the development mode of the oil reservoir block adopting the method in the embodiment 2 of the invention is researched by utilizing an oil reservoir numerical simulation method, wherein the oil reservoir parameters are as follows, the oil reservoir burial depth is 400-600m, the effective thickness is 6m, the porosity is 35%, the permeability is 3700mD, the original oil saturation is 65%, and the crude oil viscosity is 96000mPa & s. The horizontal well is positioned at the middle lower part of an oil layer, 15 periods of production are carried out by using HDNS, the production degree is 10 percent, then steam injection flooding is carried out, the steam injection speed is 1500t/d, the injection quantity is 15000t, the well shut-in time is 5 days, well production is carried out, the liquid production speed is 150t/d, the daily oil production is less than 1t/d, the expected recovery rate can reach 12.5 percent, and the method is shown in figure 2. The method realizes effective utilization of residual oil between shallow and thin extra heavy oil wells.
In conclusion, the method disclosed by the invention has the advantages that the bottom hole pressure exceeds the fracture pressure of the stratum through quickly injecting a large amount of steam, multi-directional uniform volume fractures are formed around the horizontal well, the steam sweep range is favorably expanded along the fracture direction by the steam, the fluid seepage capability is improved, and the residual oil between wells is used, so that the recovery rate is improved.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (6)
1. A steam pressure flooding oil extraction method for shallow and thin super heavy oil is characterized by comprising the following steps:
step 1: deploying a horizontal well;
step 2: injecting a large amount of steam into the horizontal well quickly to form multi-directional uniform cracks around the horizontal well;
and step 3: soaking the well;
and 4, step 4: and (5) opening the well for production, reducing the oil quantity to 1t/d, and returning to the step 2.
2. The method of claim 1, wherein in step 1, a horizontal well is deployed in the middle or lower portion of the reservoir.
3. The method of claim 1, wherein in step 2, the gas injection well has a steam dryness greater than 0.5.
4. The method as claimed in claim 1 or 3, wherein the steam injection speed of the steam injection well is 1000-.
5. The method of claim 1, wherein in step 3, the soaking time is 3-5 days.
6. The method of claim 1, wherein in step 4, the liquid production rate is greater than 100 t/d.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110237408.0A CN115012890A (en) | 2021-03-03 | 2021-03-03 | Steam pressure flooding oil extraction method for shallow and thin layer super heavy oil |
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| CN202110237408.0A CN115012890A (en) | 2021-03-03 | 2021-03-03 | Steam pressure flooding oil extraction method for shallow and thin layer super heavy oil |
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| CN115012890A true CN115012890A (en) | 2022-09-06 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1199574A (en) * | 1983-01-18 | 1986-01-21 | Winston R. Shu | Visbreaking-enhanced thermal recovery method utilizing high temperature steam |
| CN105041282A (en) * | 2015-08-17 | 2015-11-11 | 中国石油大学(华东) | Horizontal well staged fracturing and steam huff-puff method for medium-low permeability heavy oil reservoir |
| CN107664031A (en) * | 2016-07-29 | 2018-02-06 | 中国石油化工股份有限公司 | The method for improving recovery ratio by determining horizontal well steam flooding well web form |
| CN108252700A (en) * | 2018-03-18 | 2018-07-06 | 西南石油大学 | A kind of shale oil-gas reservoir heat of oxidation swashs explosion remodeling method |
| CN111364961A (en) * | 2018-12-25 | 2020-07-03 | 中国石油天然气股份有限公司 | Super heavy oil SAGD exploitation method |
| CN112127866A (en) * | 2019-06-25 | 2020-12-25 | 中国石油天然气股份有限公司 | Process for developing deep coal bed by using underground coal gasification technology |
-
2021
- 2021-03-03 CN CN202110237408.0A patent/CN115012890A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1199574A (en) * | 1983-01-18 | 1986-01-21 | Winston R. Shu | Visbreaking-enhanced thermal recovery method utilizing high temperature steam |
| CN105041282A (en) * | 2015-08-17 | 2015-11-11 | 中国石油大学(华东) | Horizontal well staged fracturing and steam huff-puff method for medium-low permeability heavy oil reservoir |
| CN107664031A (en) * | 2016-07-29 | 2018-02-06 | 中国石油化工股份有限公司 | The method for improving recovery ratio by determining horizontal well steam flooding well web form |
| CN108252700A (en) * | 2018-03-18 | 2018-07-06 | 西南石油大学 | A kind of shale oil-gas reservoir heat of oxidation swashs explosion remodeling method |
| CN111364961A (en) * | 2018-12-25 | 2020-07-03 | 中国石油天然气股份有限公司 | Super heavy oil SAGD exploitation method |
| CN112127866A (en) * | 2019-06-25 | 2020-12-25 | 中国石油天然气股份有限公司 | Process for developing deep coal bed by using underground coal gasification technology |
Non-Patent Citations (1)
| Title |
|---|
| 刘春泽;任香;李秀峦;李晓玲;刘洋;: "浅薄层超稠油水平井蒸汽吞吐后转换开发方式研究", 特种油气藏, no. 04, 25 August 2010 (2010-08-25), pages 70 - 72 * |
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