CN118110569A - Low-permeability oil reservoir waste oil well group reservoir layer reconstruction geothermal energy development method - Google Patents
Low-permeability oil reservoir waste oil well group reservoir layer reconstruction geothermal energy development method Download PDFInfo
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- CN118110569A CN118110569A CN202211509893.3A CN202211509893A CN118110569A CN 118110569 A CN118110569 A CN 118110569A CN 202211509893 A CN202211509893 A CN 202211509893A CN 118110569 A CN118110569 A CN 118110569A
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000002699 waste material Substances 0.000 title claims abstract description 26
- 239000003129 oil well Substances 0.000 title claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 238000011084 recovery Methods 0.000 claims abstract description 23
- 238000005553 drilling Methods 0.000 claims abstract description 4
- 230000009466 transformation Effects 0.000 claims abstract 2
- 230000035699 permeability Effects 0.000 claims description 4
- 238000005065 mining Methods 0.000 abstract description 3
- 238000012986 modification Methods 0.000 abstract description 2
- 230000004048 modification Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 9
- 238000004891 communication Methods 0.000 description 5
- 239000004576 sand Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000002407 reforming Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/16—Modification of mine passages or chambers for storage purposes, especially for liquids or gases
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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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T10/20—Geothermal collectors using underground water as working fluid; using working fluid injected directly into the ground, e.g. using injection wells and recovery wells
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Geochemistry & Mineralogy (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Sustainable Energy (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Combustion & Propulsion (AREA)
- Chemical & Material Sciences (AREA)
- Sustainable Development (AREA)
- Hydrology & Water Resources (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention relates to a low-permeability oil reservoir waste oil well group reservoir stratum transformation geothermal energy development method and an operation method. The method mainly solves the problems that the existing low-permeability oil reservoir waste oil well group reservoir stratum modification geothermal energy development method is easy to cause large recharging pressure difference and small recharging flow. The method is characterized in that: determining a heat recovery well and at least one recharging well, laterally drilling a short-radius horizontal well from the recharging well to the heat recovery well along the geothermal energy development layer, fracturing along the direction of the short-radius horizontal well, recharging water into the recharging well, and simultaneously, recovering hot water from the heat recovery well. The development method adopts a combined development mode of sidetrack ultra-short radius horizontal well and fracturing, well groups are balanced in mining and filling, recharging pressure difference is small, recharging efficiency is high, and the aim of efficiently developing geothermal energy is achieved.
Description
Technical Field
The invention relates to the field of oilfield geothermal energy development, in particular to a method for developing geothermal energy by reforming a reservoir of a low-permeability oil reservoir waste oil well group.
Background
The low-permeability oil reservoir is generally prepared by adopting a reservoir fracturing technology, and after a period of development, the development efficiency of the injection and production of part of well groups is deteriorated, and the development is continued without economic benefit, so that the low-permeability oil reservoir can only be abandoned, and the resource waste is caused. In order to solve the waste, the reservoir of the low-efficiency waste oil well group is reformed to be developed by geothermal energy, and the injection pressure of the original well group directly changed to geothermal energy is very high, so that the electricity consumption is large. The conventional low-permeability oil reservoir waste oil well group reservoir reconstruction geothermal energy development only adopts oil layer secondary fracturing, so that the recharging pressure difference exceeds 5MPa, the recharging flow is small and is less than 15m 3/h, the development effect is poor, and the economic benefit is low.
Disclosure of Invention
In order to overcome the defects that the existing low-permeability oil reservoir waste oil well group reservoir reconstruction geothermal energy development method is easy to cause large recharging pressure difference and small recharging flow, the invention provides the low-permeability oil reservoir waste oil well group reservoir reconstruction geothermal energy development method, which adopts a combined development mode of sidetrack ultra-short radius horizontal well and fracturing, well groups are balanced in mining and recharging, the recharging pressure difference is small, the recharging efficiency is high, and the aim of efficiently developing geothermal energy is achieved.
The technical scheme of the invention is as follows: a method for developing geothermal energy by reforming the waste oil well group of low-permeability oil reservoir includes such steps as determining a heat-collecting well and at least one recharging well, laterally drilling short-radius horizontal well from recharging well to heat-collecting well, fracturing along short-radius horizontal well, recharging water in recharging well, and collecting hot water from heat-collecting well.
Further, the distance H between the heat recovery well and the recharging well is not smaller than 300m, the length L of the short-radius horizontal well is not smaller than 200m, and the difference between H and L is 50m-100m.
Further, the single-well recharging water quantity of the recharging well is not less than 10m 3/h.
Further, the number of the heat recovery wells is one, the number of the recharging wells is two, and the recharging wells are respectively positioned on two sides of the heat recovery wells.
Further, the heat recovery well is one, and the recharging well is one.
Further, a recharging pressure difference between the recharging water pressure and the produced water pressure is not more than 1MPa.
The invention has the following beneficial effects: by adopting the scheme, the method adopts a development mode of combining one heat collecting well with one or more recharging wells, reestablishes the communication between reservoir wells, balances the heat collecting and recharging among well groups, can make full use of geothermal energy to collect hot water for supplying heat to living areas or heating other oil collecting wells, saves a large amount of coal or natural gas, and achieves the double effects of reducing development cost, saving energy and reducing emission. The heat efficiency of the geothermal heat development of the low-permeability oil reservoir waste oil well group reservoir is improved, and the method can be widely applied to the geothermal heat development of the low-permeability oil reservoir waste oil well group reservoir, and has a considerable application prospect.
Drawings
FIG. 1 is a schematic plan view of a two-well pump assembly;
FIG. 2 is a longitudinal cross-sectional view of a two-well string;
FIG. 3 is a schematic diagram of geothermal energy reservoir retrofit for a two-well set for oil recovery;
FIG. 4 is a schematic plan view of a well string;
FIG. 5 is a longitudinal cross-sectional view of a production-well group;
Fig. 6 is a schematic diagram of geothermal energy reservoir modification of a well group for oil recovery.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
Firstly, determining whether a low-permeability oil reservoir low-efficiency waste oil well group has the following technical conditions: (1) reservoir permeability less than 50 haddaci; (2) At least 2 wells are arranged in the low-efficiency waste oil well group of the low-permeability oil reservoir; (3) the well spacing between adjacent wells in the well group is not less than 300m. The development method can be implemented only after the well combination meets all of the above conditions.
A low-permeability oil reservoir waste oil well group reservoir layer reconstruction geothermal energy development method comprises the following steps:
step1, determining a heat recovery well and at least one recharging well in a low-efficiency waste oil well group, wherein the distance H between the heat recovery well and the recharging well is not less than 300m, and one heat recovery well and one recharging well (hereinafter referred to as one recovery and one recharging well) or two recharging wells (hereinafter referred to as one recovery and two recharging wells) can be arranged in one well group, wherein when the well group adopts a one recovery and two recharging mode, the heat recovery well is positioned between the two recharging wells.
And 2, determining inter-well communication sand layers among the low-efficiency waste oil well groups, and selecting one sand layer as a geothermal energy development layer. And re-windowing the recharging well at the position corresponding to the geothermal energy development layer, laterally drilling a short-radius horizontal well to the heating well along the geothermal energy development layer, wherein the length L of the short-radius horizontal well is not less than 200m, and the difference between H and L is ensured to be 50m-100 m.
And 3, fracturing along the direction of the short-radius horizontal well, and establishing a joint network communication channel with the heat collecting well.
And 4, recharging cold water into the recharging wells, wherein the recharging water quantity requirement of a single well is not lower than 10m 3/h, and the recharging is started while hot water is being recovered. Through practical application, at this time, the recharging pressure difference between recharging water pressure and produced water pressure is not more than 1MPa, and the produced water flow rate of the heat production well is not less than 10m 3/h.
Embodiment one: the geothermal energy development is carried out in a mode of adopting two tanks. The secondary fracturing heat extraction is carried out before the development method is adopted, the recharging pressure difference is 7MPa, and the recharging quantity of a single well is 10m 3/h.
By adopting the development method, as shown in figure 1, HX1-2 wells in the low-efficiency waste oil well group of the low-permeability oil reservoir are determined as heat production wells, HX1-1 wells and HX1-3 wells are determined as recharging wells, the well spacing H 1 between the HX1-1 wells and the HX1-2 wells is 330m, and the well spacing H 2 between the HX1-3 wells and the HX1-2 wells is 370m. As shown in fig. 2, one sand layer was selected as the geothermal energy development layer. As shown in FIG. 3, two recharging wells HX1-1 and HX1-3 are re-windowed, and a short radius horizontal well is drilled sideways along the geothermal energy development layer to the thermal well HX1-2, with a horizontal well length L 1 of 250m and L 2 of 300m. Fracturing along the direction of the short-radius horizontal well, and establishing a joint network communication channel with the heat-collecting well. Cold water is respectively refilled into the two recharging wells HX1-1 and HX1-3, the single-well recharging water amount is 20m 3/h, hot water is started to be collected by the heat collection well HX1-2 while cold water is refilled, the recharging pressure difference is 0.9MPa, the water collection flow rate of the heat collection well is 40m 3/h, the maximum wellhead liquid production temperature is 65 ℃, the well group heat production power is 2.0 MW, and the development effect is obvious.
Embodiment two: the geothermal energy development is carried out in a one-mining one-filling mode.
As shown in FIG. 4, HX2-2 well in the low-permeability reservoir low-efficiency abandoned oil well group is determined as a heat production well, HX2-1 well is determined as a recharging well, and the well distance H between the HX2-1 well and the HX2-2 well is 400m. As shown in fig. 5, one sand layer was selected as the geothermal energy development layer. As shown in FIG. 6, the recharging well HX2-1 is re-windowed, and a short radius horizontal well is drilled along the geothermal energy development layer towards the side of the heat production well HX2-2, and the length L of the horizontal well is 300m. Fracturing along the direction of the short-radius horizontal well, and establishing a joint network communication channel with the heat-collecting well. Cold water is refilled into the recharging well HX2-1, and the recharging water quantity of a single well is 10m 3/h. And recharging cold water, and simultaneously starting to collect hot water from the HX2-2 well of the heat collection well, wherein the recharging pressure difference is 1MPa, the water collection flow rate of the heat collection well is 10m 3/h, the maximum liquid production temperature of a wellhead is 65 ℃, and the heat production power of a well group is 1 MW.
Claims (6)
1. A low-permeability oil reservoir waste oil well group reservoir layer transformation geothermal energy development method is characterized in that: determining a heat recovery well and at least one recharging well, laterally drilling a short-radius horizontal well from the recharging well to the heat recovery well along the geothermal energy development layer, fracturing along the direction of the short-radius horizontal well, recharging water into the recharging well, and simultaneously, recovering hot water from the heat recovery well.
2. The method for developing geothermal energy for the reservoir reformation of the low-permeability oil reservoir waste oil well group according to claim 1, wherein the method comprises the following steps: the distance H between the heat recovery well and the recharging well is not less than 300m, the length L of the short-radius horizontal well is not less than 200m, and the difference between H and L is 50m-100m.
3. The method for developing geothermal energy for the reservoir reformation of the low-permeability oil reservoir waste oil well group according to claim 2, wherein the method comprises the following steps: and the single-well recharging water quantity of the recharging well is not less than 10m 3/h.
4. The method for developing geothermal energy for the reconstruction of a low permeability reservoir waste oil well group reservoir according to claim 3, wherein: the number of the heat recovery wells is one, the number of the recharging wells is two, and the recharging wells are respectively positioned at two sides of the heat recovery wells.
5. The method for developing geothermal energy for the reconstruction of a low permeability reservoir waste oil well group reservoir according to claim 3, wherein: the heat recovery well is one, and the recharging well is one.
6. The method for developing geothermal energy for the reconstruction of a low permeability reservoir waste oil well group reservoir according to claim 4 or 5, wherein: the recharging pressure difference between the recharging water pressure and the produced water pressure is not more than 1MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211509893.3A CN118110569A (en) | 2022-11-29 | 2022-11-29 | Low-permeability oil reservoir waste oil well group reservoir layer reconstruction geothermal energy development method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211509893.3A CN118110569A (en) | 2022-11-29 | 2022-11-29 | Low-permeability oil reservoir waste oil well group reservoir layer reconstruction geothermal energy development method |
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| Publication Number | Publication Date |
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| CN118110569A true CN118110569A (en) | 2024-05-31 |
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| CN202211509893.3A Pending CN118110569A (en) | 2022-11-29 | 2022-11-29 | Low-permeability oil reservoir waste oil well group reservoir layer reconstruction geothermal energy development method |
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| Country | Link |
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| CN (1) | CN118110569A (en) |
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2022
- 2022-11-29 CN CN202211509893.3A patent/CN118110569A/en active Pending
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