CN110552673A - Method for improving extraction degree of low-pressure tight oil reservoir - Google Patents
Method for improving extraction degree of low-pressure tight oil reservoir Download PDFInfo
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- CN110552673A CN110552673A CN201910759992.9A CN201910759992A CN110552673A CN 110552673 A CN110552673 A CN 110552673A CN 201910759992 A CN201910759992 A CN 201910759992A CN 110552673 A CN110552673 A CN 110552673A
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- 238000000605 extraction Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 51
- 238000002347 injection Methods 0.000 claims abstract description 33
- 239000007924 injection Substances 0.000 claims abstract description 33
- 238000004519 manufacturing process Methods 0.000 claims abstract description 31
- 230000015572 biosynthetic process Effects 0.000 claims description 9
- 238000006073 displacement reaction Methods 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 238000011161 development Methods 0.000 description 8
- 230000018109 developmental process Effects 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 4
- 235000020681 well water Nutrition 0.000 description 4
- 239000002349 well water Substances 0.000 description 4
- 230000002354 daily effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000000977 initiatory effect Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 235000021185 dessert Nutrition 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
Classifications
-
- 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
- E21B43/20—Displacing by water
-
- 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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- 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
- E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells
-
- 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
- E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells
- E21B43/305—Specific pattern of wells, e.g. optimising the spacing of wells comprising at least one inclined or horizontal well
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Edible Oils And Fats (AREA)
Abstract
the invention discloses a method for improving the extraction degree of a low-pressure tight oil reservoir, which comprises the following steps of arranging a plurality of horizontal wells on the low-pressure tight oil reservoir, wherein well bores of the horizontal wells are all vertical to the direction of the maximum main stress of a stratum; a plurality of perforation sections are arranged on each horizontal well, and the perforation section position of each horizontal well and the perforation section position of the adjacent horizontal well are distributed in a staggered manner; performing limit clustering perforation on each perforation segment; the length of a fracturing crack from each horizontal well to each perforation section reaches a preset length, and all fracturing cracks of two adjacent horizontal wells are distributed in a staggered mode; dividing all horizontal wells into water injection wells and oil production wells, wherein the water injection wells and the oil production wells are distributed in a staggered mode; and injecting water into the water injection well until the pressure of the oil layer reaches 120-130% of the pressure of the original stratum, and extracting oil through the oil extraction well. The oil in the reservoir is linearly displaced to the cracks of the oil production well through each crack of the water injection well, the final extraction degree of a single well reaches more than 80%, and the extraction degree is greatly improved.
Description
Technical Field
the invention belongs to the field of oil and gas field exploration and development, and relates to a method for improving the extraction degree of a low-pressure compact oil reservoir.
background
At present, low-pressure compact oil reservoirs are mainly developed by adopting horizontal well quasi-natural energy or vertical well water injection horizontal well oil extraction.
However, under the condition of quasi-natural energy development after horizontal well volume fracturing, the initial yield is high, but the yield is greatly reduced due to the fact that energy supplement cannot be obtained, the annual rate of decrease reaches about 40%, and the final production degree generally does not exceed 25%; under the condition of oil extraction development of the vertical well water injection horizontal well, although stratum energy is supplemented, injected water is expanded radially, swept area is limited, residual oil area is large, the oil extraction horizontal well is easy to see water, high water content and even violent flooding are caused, and the final extraction degree is only about 30%. It can be seen that the production levels of these two oil recovery developments are extremely low.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for improving the production degree of a low-pressure tight oil reservoir.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a method for improving the extraction degree of a low-pressure tight oil reservoir comprises the following steps:
s1: arranging a plurality of horizontal wells on the low-pressure tight oil reservoir, wherein well bores of the horizontal wells are perpendicular to the direction of the maximum main stress of the stratum;
s2: a plurality of perforation sections are arranged on each horizontal well, and the perforation section position of each horizontal well and the perforation section position of the adjacent horizontal well are distributed in a staggered manner;
s3: performing limit clustering perforation on each perforation segment;
S4: the length of a fracturing crack from each horizontal well to each perforation section reaches a preset length, and all fracturing cracks of two adjacent horizontal wells are distributed in a staggered mode;
s5: dividing all horizontal wells into water injection wells and oil production wells, wherein the water injection wells and the oil production wells are distributed in a staggered mode;
S6: and injecting water into the water injection well until the oil layer pressure reaches the preset multiple of the original formation pressure, and extracting oil through the oil extraction well.
The invention further improves the following steps:
the length of the perforation section in the S2 is 50-80 m.
The specific method of S3 is as follows:
And performing limit clustering perforation on each perforation section, wherein 8-12 clusters of perforation are formed on each perforation section, the cluster spacing is 5-10 m, each cluster has 2 holes, and the diameter of each perforation is 14-16 mm.
The concrete method for fracturing each horizontal well in the S4 comprises the following steps:
The half length of a fracturing crack from each horizontal well to each perforation section is 90-95% of the well distance of two adjacent horizontal wells by a segmented multi-cluster volume fracturing method.
The specific method of S6 is as follows:
And (3) injecting water of 40-60 m 3 into the water injection well day until the oil reservoir pressure reaches 120-130% of the original formation pressure, and starting oil extraction through the oil production well.
And adding an oil displacement agent into the daily flooding water in the S6 according to the volume concentration of 1.2-1.5%.
compared with the prior art, the invention has the following beneficial effects:
According to the invention, by adopting a well pattern design of staggered distribution of the water injection wells and the oil production wells, the formation energy can be supplemented for a long time for the oil production wells, meanwhile, through optimizing the staggered seam arrangement design, the water flooding swept area is nearly 100%, the oil in the reservoir is displaced to the cracks of the adjacent oil production horizontal wells in a linear flow mode through the water flooding effect of injected water, and the final extraction degree reaches more than 80%, compared with the quasi-natural energy development after the volume fracturing of the existing low-pressure compact oil reservoir horizontal well and the oil production development of a vertical well water injection horizontal well, under the quasi-natural energy development condition after the volume fracturing of the existing low-pressure compact oil reservoir horizontal well, although the initial yield of the oil production well is high, the yield is greatly reduced, the annual rate of reduction reaches about 40%, and the final extraction degree is generally; under the oil extraction development condition of the vertical well water injection horizontal well, the swept area is limited, the residual oil area is large, the oil extraction horizontal well is easy to see water, high water content and even violent flooding are caused, and the final extraction degree is about 30%.
furthermore, the length of the perforation section is 50-80 m, and the design of subdividing, cutting and densely distributing the cracks is adopted, so that the length of the section is shortened, the number of the sections is increased, and the contact area between the cracks and the oil reservoir is increased.
Furthermore, each perforation section is subjected to limit clustering perforation, 8-12 clusters of perforations are formed in each perforation section, the cluster interval is 5-10 m, 2 holes are formed in each cluster, and the diameter of each perforation is 14-16 mm.
furthermore, the half length of the fracturing fracture of each perforation section is 90-95% of the well distance of two adjacent horizontal wells, and the adjacent horizontal wells are prevented from communicating while the fractures are ensured to control the oil deposit to the maximum extent.
furthermore, water is injected into the water injection well by 40-60 m 3 every day, according to the pressure bearing capacity of a water injection pipe network and equipment and the daily water injection quantity optimized by the absorption capacity of a compact oil layer, the yield can be effectively reduced and decreased by supplementing formation energy through water injection, the accumulated yield is improved, and the stable yield effect is the best when the formation energy reaches 120% -130%.
Furthermore, the oil displacement agent is added in the injected water, so that the oil displacement effect of water is further improved, and the extraction degree is further improved.
Drawings
FIG. 1 is a schematic flow diagram of the process of the present invention;
FIG. 2 is a schematic view of the cloth seam of the present invention.
Wherein: 1-producing oil well; 2-water injection well; 3-fracturing the fractures of the oil production well; 4-fracturing cracks of the water injection well.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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 should be noted that the terms "first," "second," and the like in the description and claims of the present invention 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 invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the method for improving the extraction degree of the low-pressure tight oil reservoir comprises the following steps:
S1: and arranging a plurality of horizontal wells on the low-pressure tight oil reservoir, wherein well shafts of the horizontal wells are perpendicular to the direction of the maximum main stress of the stratum.
S2: a plurality of perforation sections are arranged on each horizontal well, and the perforation section position of each horizontal well and the perforation section position of the adjacent horizontal well are distributed in a staggered manner; wherein, the length of perforation section is 50 ~ 80m, preferably 70 m.
S3: performing limit clustering perforation on each perforation segment; each perforation section is provided with 8-12 clusters of perforations, preferably 10 clusters; the cluster spacing is 5-10 m, preferably 8 m; 2 wells per cluster; the diameter of each hole is 14-16 mm, and preferably 15 mm. The limit perforation technology is different from the conventional multi-cluster perforation technology at present in that the number of single-section perforation clusters is increased to 8-12 clusters from 3-6 clusters in the conventional technology, but each cluster has only 2 holes, the number of holes in each cluster in the conventional technology is 8-15 holes, the total number of perforation holes is greatly reduced, the pressure at the bottom of a well can greatly rise under the same discharge capacity, the problem of crack initiation stress difference between clusters due to reservoir heterogeneity is effectively overcome, the clusters which are difficult to crack are forced to crack is solved, and the multi-cluster crack initiation efficiency is effectively improved.
S4: and fracturing each horizontal well by a segmented multi-cluster volume fracturing method until the half length of a fracturing crack of each perforation segment is 90-95% of the well distance of two adjacent horizontal wells, preferably 93%, and all fracturing cracks of the two adjacent horizontal wells are distributed in a staggered manner. The segmented multi-cluster volume fracturing is a main body transformation mode of unconventional reservoir horizontal wells such as compact oil and compact gas at present, a horizontal well is designed to fracture a plurality of segments according to transformation requirements and dessert drilling conditions, the segments are isolated by using tools such as a bridge plug, 3-6 clusters are ejected from each segment for combined pressure, and the whole well is produced after segment-by-segment pressure is completed.
s5: all horizontal wells are divided into water injection wells 2 and oil production wells 1, and the water injection wells 2 and the oil production wells 1 are distributed in a staggered mode.
And S6, injecting water into the water injection well for 2 days at a rate of 40-60 m 3, preferably 50m 3, and starting oil recovery through the oil production well 1 when the oil reservoir pressure reaches 120-130% of the original formation pressure, preferably 125%, wherein the oil displacement agent is added into the daily injection water at a volume concentration of 1.2-1.5%, preferably 1.4%.
Examples
1. Horizontal well deployment
5 horizontal wells are arranged in a certain low-pressure tight oil reservoir, every two horizontal wells are parallel to each other, and the horizontal wells are perpendicular to the direction of the maximum main stress of the stratum.
2. Perforation seam arrangement and fracturing reconstruction
The perforation section position of each horizontal well and the perforation section position of the other adjacent well are distributed in a mutually staggered mode, 10 clusters of perforations are arranged on each section, the cluster interval is 8m, 2 holes are arranged on each cluster, the perforation diameter is 14mm, the average single-section length is 60m, a fracturing unit 1 set is arranged, sand is added to 180m 3 on the average single section, the single-section ground liquid entering amount is 1200m 3, the injection discharge amount is 12m 3/min, the average sand ratio is 15%, 5 horizontal wells in a well network are pressed section by section, and pressed cracks are shown in figure 2.
3. Water injection and oil extraction
After the deployed 5 horizontal wells are completely fractured by volume fracturing, 2 wells serve as water injection wells 2, the other 3 wells serve as oil production wells 1, the water injection wells 2 and the oil production wells 1 are sequentially distributed in a staggered manner, the oil production wells 1 are closed after the oil production wells are fractured, water is injected into the water injection wells for 2 days by 50m 3, oil displacement agents are added into the injected water according to the volume concentration of 1.3%, the oil-water displacement efficiency is improved, when the oil layer pressure reaches 120% of the original formation pressure, the oil production wells 1 start normal production, the injected water linearly displaces the oil in the reservoir layer to the fractures of the oil production horizontal wells through each fracture of the water injection wells 2, and the single well control reserve volume is finally produced to reach 80%.
the above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (6)
1. The method for improving the extraction degree of the low-pressure tight oil reservoir is characterized by comprising the following steps of:
S1: arranging a plurality of horizontal wells on the low-pressure tight oil reservoir, wherein well bores of the horizontal wells are perpendicular to the direction of the maximum main stress of the stratum;
S2: a plurality of perforation sections are arranged on each horizontal well, and the perforation section position of each horizontal well and the perforation section position of the adjacent horizontal well are distributed in a staggered manner;
S3: performing limit clustering perforation on each perforation segment;
S4: the length of a fracturing crack from each horizontal well to each perforation section reaches a preset length, and all fracturing cracks of two adjacent horizontal wells are distributed in a staggered mode;
S5: dividing all horizontal wells into water injection wells (2) and oil production wells (1), wherein the water injection wells (2) and the oil production wells (1) are distributed in a staggered mode;
S6: and (3) injecting water into the water injection well (2) until the oil layer pressure reaches the preset multiple of the original formation pressure, and extracting oil through the oil extraction well (1).
2. The method for improving the production degree of the low-pressure tight oil reservoir according to claim 1, wherein the length of the perforation section in the S2 is 50-80 m.
3. the method for improving the extraction degree of the low-pressure tight oil reservoir according to claim 1, wherein the specific method of S3 is as follows:
And performing limit clustering perforation on each perforation section, wherein 8-12 clusters of perforation are formed on each perforation section, the cluster spacing is 5-10 m, each cluster has 2 holes, and the diameter of each perforation is 14-16 mm.
4. The method for improving the production degree of the low-pressure tight oil reservoir according to claim 1, wherein the specific method for fracturing each horizontal well in S4 is as follows:
The half length of a fracturing crack from each horizontal well to each perforation section is 90-95% of the well distance of two adjacent horizontal wells by a segmented multi-cluster volume fracturing method.
5. The method for improving the extraction degree of the low-pressure tight oil reservoir according to claim 1, wherein the specific method of S6 is as follows:
Injecting water of 40-60 m 3 into the water injection well (2) daily until the oil layer pressure reaches 120-130% of the original formation pressure, and starting oil extraction through the oil production well (1).
6. the method for improving the production degree of the low-pressure tight oil reservoir according to claim 5, wherein an oil displacement agent is added into the daily flooding water in the S6 according to the volume concentration of 1.2-1.5%.
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Cited By (4)
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| CN111322052A (en) * | 2019-12-12 | 2020-06-23 | 大庆油田有限责任公司 | Method for injecting oil displacement agent and plugging agent into thick oil layer by fracturing to drive and wash low-water-content part and plug strong-water-washing strip |
| CN111980658A (en) * | 2020-09-02 | 2020-11-24 | 中国石油天然气股份有限公司 | Drilling method and drilling system |
| CN112282725A (en) * | 2020-11-03 | 2021-01-29 | 中国石油天然气股份有限公司 | Staggered seam-laying design method for horizontal well |
| CN112878996A (en) * | 2021-01-29 | 2021-06-01 | 中国石油天然气集团有限公司 | Method for judging and identifying fracture channeling of fractured horizontal well |
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| CN112282725A (en) * | 2020-11-03 | 2021-01-29 | 中国石油天然气股份有限公司 | Staggered seam-laying design method for horizontal well |
| CN112878996A (en) * | 2021-01-29 | 2021-06-01 | 中国石油天然气集团有限公司 | Method for judging and identifying fracture channeling of fractured horizontal well |
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Application publication date: 20191210 |
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| RJ01 | Rejection of invention patent application after publication |