CN113738317A - Method for combined exploitation of deep coal bed gas and dry hot rock type geothermal - Google Patents

Method for combined exploitation of deep coal bed gas and dry hot rock type geothermal Download PDF

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Publication number
CN113738317A
CN113738317A CN202111196396.8A CN202111196396A CN113738317A CN 113738317 A CN113738317 A CN 113738317A CN 202111196396 A CN202111196396 A CN 202111196396A CN 113738317 A CN113738317 A CN 113738317A
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China
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well
geothermal
exploitation
injection
section
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Inventor
周效志
韩思杰
孙钊
桑树勋
赵凌云
魏元龙
王梓良
向文鑫
陈畅然
汪俊
杨梓钢
荆雅婕
邱文慈
王怡翀
徐昂
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Guizhou Oil And Gas Exploration And Development Engineering Research Institute
China University of Mining and Technology CUMT
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China University of Mining and Technology CUMT
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Priority to CN202111196396.8A priority Critical patent/CN113738317A/en
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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
    • E21B43/006—Production of coal-bed methane
    • 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
    • E21B43/02—Subsoil filtering
    • E21B43/10—Setting of casings, screens, liners or the like in wells
    • E21B43/103—Setting of casings, screens, liners or the like in wells of expandable casings, screens, liners, or the like
    • 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
    • E21B43/164—Injecting CO2 or carbonated water
    • 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
    • E21B43/25—Methods for stimulating production
    • E21B43/26—Methods for stimulating production by forming crevices or fractures
    • 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
    • E21B43/25—Methods for stimulating production
    • E21B43/26—Methods for stimulating production by forming crevices or fractures
    • E21B43/2605—Methods for stimulating production by forming crevices or fractures using gas or liquefied gas
    • 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
    • E21B43/30—Specific pattern of wells, e.g. optimizing the spacing of wells
    • E21B43/305—Specific pattern of wells, e.g. optimizing the spacing of wells comprising at least one inclined or horizontal well
    • 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
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/04—Directional drilling
    • 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
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/04—Directional drilling
    • E21B7/046—Directional drilling horizontal drilling
    • 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
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
    • F03G7/00—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for
    • F03G7/04—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for using pressure differences or thermal differences occurring in nature
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/10—Geothermal energy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/70—Combining sequestration of CO2 and exploitation of hydrocarbons by injecting CO2 or carbonated water in oil wells

Abstract

The invention discloses a method for combined exploitation of deep coal bed methane and dry hot rock type geothermal, and belongs to the technical field of geological new energy development. CO 22The injection well is a single-branch horizontal well, and the horizontal well section is positioned in the geothermal reservoir of the dry hot rock and is horizontalConstructing 8-10 geothermal exploitation vertical wells on the ground on two sides of the well section; CO 22Staged fracturing is performed on horizontal well sections of the injection well, and fracturing is performed synchronously with a geothermal exploitation vertical well, so that CO is generated2An artificial fracture channel is formed between the injection well and the geothermal exploitation well. CO 22Injecting a side-drilling branch horizontal well into a vertical well section of an injection well, wherein the side-drilling horizontal well section is positioned in a deep coal reservoir, and after drilling is finished, a screen pipe is put for well completion; and constructing 8-10 coal bed gas exploitation vertical wells on the ground at two sides of the sidetracking horizontal well section, and modifying the deep coal reservoir in a fracturing mode after perforation completion. CO 22Continuously injecting gas into the injection well by means of CO2To CH4The displacement and displacement effects of the (C) can improve the recovery ratio of deep coal bed gas and simultaneously use supercritical CO2Extracting geothermal energy from hot dry rock for circulating working medium, and using supercritical CO2The generator converts geothermal energy into electrical energy.

Description

Method for combined exploitation of deep coal bed gas and dry hot rock type geothermal
Technical Field
The invention relates to a method for deep coal bed gas and dry hot rock type geothermal combined exploitation, in particular to a method suitable for continuously injecting CO from a single-branch horizontal well2By means of CO2To CH4The displacement and displacement effects of the method improve the resource recovery ratio of the coal bed gas in the deep coal reservoir, and simultaneously, supercritical CO is used2(scCO2) A method for extracting geothermal energy in a dry-hot rock geothermal reservoir for a cycle fluid belongs to the technical field of deep geological new energy development.
Background
The deep coal bed gas resources in China are rich, and the quantity of the coal bed gas resources with the burial depth of 1000-1500 m is about 21 multiplied by 1012m3The amount of the 1500-3000 m coal bed gas resources is about 30 multiplied by 1012m3And respectively account for 38.2 percent and 54.5 percent of the total resource of the shallow coal bed gas with the volume of 3000 m. At present, the depth of coal bed gas exploration and development in China and major countries in the world is concentrated on being shallow than 1000m, so that the situation of shortage of conventional oil and gas energy supply in China can be solved to a certain extent for large-scale development of deep coal bed gas resources, and remarkable economic, environmental and social benefits can be generated.
The dry-hot rock type geothermal energy is an important occurrence form of geothermal resources and is a main attack direction of future geothermal development. The amount of hot dry rock resources in China is huge, but development and research work starts late, deep hot dry rock geothermal resources after reservoir fracturing modification are extracted mainly by means of water circulation at present, and lost water is continuously supplemented in the circulation process, so that hot dry rock reservoir modification and water supply and consumption are important problems restricting hot dry rock geothermal development.
The deep coal bed gas resources and dry heat rock geothermal resources of the north China's rock-charcoal two-stacked system coal-endowing basin represented by the Shanxi province water-logging basin are very rich, and the resource development potential is huge. Because the metamorphism degree of coal in the region is generally higher, and the influence of high factors such as the ground stress borne by a deep coal reservoir is superposed at the same time, the permeability of the deep coal reservoir is extremely low, so that the reservoir pressure drop funnel is difficult to expand when a traditional drainage and depressurization mining mode is adopted, the recovery ratio of coal bed gas resources in a well control range is low, the gas production effect of a coal bed gas development well is poor, and the deep coal bed gas development is influenced by high factors such as the ground stress and the likeIt is economically poor. By continuous CO injection2The deep coal bed gas is developed and supercritical CO is adopted2(scCO2) The method combines the dry hot rock type geothermal exploitation of the cycle working medium, realizes the combined exploitation of the deep coal bed gas and the dry hot rock type geothermal, and can solve the problems of low resource recovery ratio, poor economy, low water cycle heat extraction efficiency of the dry hot rock type geothermal exploitation and large environmental influence to a great extent.
Disclosure of Invention
The technical problem is as follows: the invention aims to solve the problems of low gas production rate, low resource recovery rate, poor economy in deep coal bed methane exploitation, low heat extraction efficiency in circulation of dry-hot rock geothermal exploitation water, large environmental influence and the like in the traditional drainage depressurization exploitation mode, and provides a method for continuously injecting CO through a horizontal well2The method is used for the geothermal combined exploitation of deep coal bed gas and dry hot rock types.
The technical scheme is as follows: in order to achieve the aim, the invention discloses a method for combined exploitation of deep coal bed methane and dry hot rock type geothermal, which comprises the following steps:
(a) constructing a section comprising a straight well section, a deflecting well section and a horizontal well section on the ground of a dry hot rock geothermal reservoir and deep coal reservoir occurrence area to be used as CO2Single branch horizontal well of injection well, CO2Injecting the well to the position with the vertical depth of 3000-4000 m of the buried depth of the dry heat rock geothermal reservoir;
(b) in the CO2Both sides of horizontal well section of injection well and CO2Constructing a plurality of geothermal exploitation wells at the position 250-300 m away from the plane of the horizontal well section of the injection well;
(c) to CO2The horizontal well section of the injection well is subjected to subsection perforation and fracturing from the toe end, and simultaneously, CO is subjected to subsection perforation and fracturing2Perforating and fracturing the adjacent geothermal exploitation wells on the planes of the fracturing sections of the injection well to achieve CO2Synchronous fracturing effect of injection well and geothermal exploitation well to make CO2The injection well segmented fracturing network is communicated with the geothermal exploitation well fracturing network; CO 22In the synchronous fracturing process of the injection well and the geothermal exploitation well, evaluating the generation condition of artificial fractures in a geothermal reservoir of the dry hot rock by adopting a micro-seismic fracturing monitoring method in the well;
(d) in CO2Selecting a sidetrack position in a vertical well section of an injection well, sidetrack a branched horizontal well, after the branched horizontal well is drilled, completing well by hanging a technical casing on a sidetrack branched deflecting section, drilling a branched horizontal well section with the length of 800-1000 m from a landing point of the sidetrack branched horizontal well along the direction of a deep coal reservoir, and putting the branched horizontal well section into a horizontal well section screen pipe for completing the well;
(e) in CO2Constructing 8-10 coalbed methane exploitation wells on the ground at the positions, 200-250 m away from the horizontal well section plane, of two sides of the injection well sidetracking branch horizontal well, wherein the coalbed methane exploitation wells take a deep coal reservoir well section as a continuous perforation section, and performing permeability transformation on a deep coal reservoir around a shaft of the coalbed methane exploitation well in a hydraulic fracturing mode after perforation completion;
(f) fracturing construction is carried out on the permeability improvement of the deep coal reservoir in a mode of 'optical sleeve injection fracturing', in the fracturing process, a ground micro-seismic fracturing monitoring method is adopted to monitor the generation condition of a fracturing net of the coal bed methane exploitation well, after the fracturing construction of the coal bed methane exploitation well is finished, a drainage and exploitation pipe column is put into a shaft of the coal bed methane exploitation well, and a drainage and exploitation device is installed on the ground to carry out drainage and gas exploitation operation;
(g) by using CO2The injection pump will carry the CO on board2CO in storage tank2Injection into CO by continuous injection2In the injection well, the supercritical scCO is extracted by controlling the bottom flowing pressure of the coal bed gas extraction well, discharging water and extracting gas and controlling the wellhead pressure of the geothermal extraction well2On the one hand using CO2To CH4The replacement and displacement effects of the coal bed gas extraction well improve the gas production effect of the coal bed gas extraction well and the coal bed gas recovery ratio in a deep coal reservoir; on the other hand, with deep supercritical scCO2Extracting geothermal energy from geothermal reservoir of dry hot rock for circulating working medium, and using supercritical scCO2The generator converts geothermal energy into electrical energy.
In step (a), the CO2The injection well adopts a three-opening well body structure, wherein one opening and the other opening are drilled in an overlying rock stratum of the dry hot rock geothermal reservoir and are respectively drilled into a surface casing and a technical casing for well cementation; the landing point of the single-branch horizontal well is positioned in a dry heat rock geothermal reservoir, and the three-section horizontal well section is in dry heatDrilling 800-1000 m in the rock geothermal reservoir, and putting a horizontal well section into a production casing for well cementation after drilling.
In the step (b), the multiple geothermal exploitation wells are all vertical wells and are positioned in the CO2And 4-5 holes are formed in each of two sides of the horizontal well section of the injection well, and the well mouth connecting line of the single-side geothermal exploitation well is consistent with the direction of the stratum.
In the step (b), the geothermal exploitation well adopts a three-opening well body structure, wherein one opening and the other opening are drilled in an overlying rock stratum of a geothermal reservoir of dry hot rock and are respectively lowered into a surface casing and a technical casing for well cementation; and (5) drilling three times to 80m below the geothermal reservoir of the dry hot rock, and then drilling three times and putting a production casing for well cementation.
In step (c), the CO2Dividing an injection well horizontal well section into 8-10 fracturing sections with equal length, sequentially performing fracturing construction from the toe end of the horizontal well section, and controlling the length of a single fracturing section to be 80-100 m; 3-4 clusters of single fracturing section perforation, wherein the length of a single cluster perforation is 1.5-2.0 m, the density of the perforation is 16 bullets/m, and the fracturing construction adopts a mode of 'optical sleeve injection fracturing + bridge plug packing segmentation'; and the geothermal exploitation well is continuously perforated in a geothermal reservoir of the dry hot rock, the length of a perforation section is 4.0-6.0 m, the hole density is 16 bullets/m, and the fracturing construction adopts a light sleeve injection fracturing mode.
In step (d), the CO2The sidetracking position of the injection well vertical well section (3-1) is positioned 250-300 m above the deep coal reservoir; the hanging technical casing of the sidetracking branch deflecting section has the same pipe diameter as the screen pipe of the horizontal well section and is connected with the screen pipe through a casing coupling.
In the step (e), the coal bed gas production wells are all vertical wells and are positioned in the CO24-5 holes are drilled on two sides of a sidetracking branch horizontal well of the injection well, and the well mouth connecting line of the coal bed gas exploitation well on one side is consistent with the direction of the stratum; the length of a perforation section of the coal bed gas production well in a deep coal reservoir for continuous perforation is 3.0-5.0 m, and the hole density is 16 bullets/m.
In the step (e), the coalbed methane production well adopts a three-opening well body structure, wherein one opening and the other opening are drilled in an overlying rock stratum of a deep coal reservoir and are respectively lowered into a surface casing and a technical casing for well cementation; and drilling the third opening to 50m below the deep coal reservoir, and then drilling the third opening into a production casing for well cementation.
In the step (f), the discharging and extracting pipe column which is put into the shaft of the coal bed gas extraction well comprises a pipe pump, an oil pipe, an oil pumping pipe, a pressure gauge, a gas anchor and a water anchor which are connected in sequence, and the discharging and extracting device which is installed on the ground comprises a beam pumping unit (14), a gas-water pipeline, a rotary valve, a pressure gauge, a flow meter and a gas-water separator which are connected in sequence.
In step (g), the CO2In a continuous injection mode, CO2The initial injection speed is 80 t/d;
when CO is present2When the wellhead pressure of the injection well is lower than 20MPa, the CO is gradually increased in a 2t/d injection increasing mode2Wellhead pressure of the injection well; when CO is present2When the pressure of the well mouth of the injection well reaches 20MPa, constant CO is adopted2Injecting in a speed mode;
the wellhead pressure of the geothermal exploitation well is controlled to be 10 MPa; the coal bed gas exploitation well adopts a discharging and exploiting control mode of daily amplitude reduction of constant bottom-hole flowing pressure in the early stage and adopts a discharging and exploiting control mode of stable bottom-hole flowing pressure in the later stage.
Has the advantages that: by adopting the technical scheme, the problems of low gas production rate, low resource recovery rate and poor economical efficiency of deep coal bed methane exploitation under the traditional drainage depressurization exploitation mode, low water circulation heat extraction efficiency of dry-hot rock geothermal exploitation and large environmental influence are solved. Setting single-branch horizontal well as CO2Injection well of CO2Staged fracturing is performed on horizontal well sections of the injection well, and fracturing is performed synchronously with a geothermal exploitation vertical well, so that CO is generated2An artificial fracture channel is formed between the injection well and the geothermal exploitation well. In CO2Injecting a side-drilling branch horizontal well into a vertical well section of an injection well, wherein the side-drilling horizontal well section is positioned in a deep coal reservoir, and after drilling is finished, a screen pipe is put for well completion; and constructing a plurality of coal bed gas exploitation vertical wells on the ground on two sides of the sidetracking horizontal well section, and modifying the deep coal reservoir in a fracturing mode after perforation completion. CO 22Continuously injecting gas into the injection well by means of CO2To CH4The displacement and displacement effects of the (C) can improve the recovery ratio of deep coal bed gas and simultaneously use supercritical CO2Extracting geothermal energy from hot dry rock for circulating working medium, and using supercritical CO2The generator converts geothermal energy into electrical energy. Compared with the prior artThe main advantages compared are: the combined exploitation of the deep coal bed gas and the dry hot rock geothermal resources within the range of 2000-4000 m is realized; utilizing CO 22Replacement, displacement and scCO of2As a circulating working medium, the deep coal bed gas and dry hot rock type geothermal exploitation effect is obviously improved; thirdly, CO is realized while the coalbed methane and the dry heat rock type geothermal geology new energy are jointly developed2Geological sequestration and greenhouse gas emission reduction; the technical process is simple, the engineering implementation cost is low, and the economic, environmental and social benefits are good.
Drawings
FIG. 1 is a cut-away perspective view of the present invention for deep coal seam gas and dry hot rock type geothermal combined mining.
FIG. 2 is a plan view of a hot dry rock geothermal reservoir for combined deep coal bed methane and hot dry rock type geothermal mining in accordance with the present invention.
FIG. 3 is a top plan view of a deep coal seam face for combined deep coalbed methane and hot dry rock geothermal mining of the present invention.
In the figure: 1-vehicle mounted CO2A storage tank; 2-CO2An injection pump; 3-CO2An injection well; 3-1-straight well section; 3-2-deflecting well section; 3-3-horizontal well section; 3-4-toe end; 3-5-branch horizontal wells; 3-6-sidetrack branch horizontal well section; 3-7-sidetracking branch deflecting section; 4-CO2Injecting well surface casing; 5-CO2Injection well technology casing; 6-CO2Injection well production casing; 7-a hot dry rock geothermal reservoir; 8-CO2Injecting a well into the segmented fracture network; 9-fracturing the fracture network of the geothermal exploitation well; 10-deep coal reservoir; 11-hanging technical casing; 12-horizontal well section screen; 13-fracturing the fracture network of the coal bed gas production well; 14-a pumping unit; 15-a coal bed gas production well; 16-a surface casing of the coal bed gas exploitation well; 17-coal bed gas exploitation well technology casing; 18-a coalbed methane production well production casing; 19-geothermal production wells; 20-geothermal exploitation well surface casing; 21-geothermal exploitation well technology casing; 22-geothermal production well production casing; 23-supercritical CO2(scCO2) A generator; 24-deep coal reservoir landing site; 25-hot dry rock geothermal reservoir landing site; 26-horizontal well fracturing section; 27-sidetrack position; 28-ground.
Detailed Description
The invention will be further described with reference to examples in the drawings to which:
as shown in fig. 1, the method for the geothermal combined mining of deep coal bed methane and dry hot rock type of the invention comprises the following specific steps:
(a) constructing a vertical shaft section 3-1, a deflecting shaft section 3-2 and a horizontal shaft section 3-3 as CO on the ground 28 of the occurrence area of the dry hot rock geothermal reservoir 7 and the deep coal reservoir 102Single-branch horizontal well of injection well 3, CO2The injection well 3 is vertically deep until the burial depth of the dry heat rock geothermal reservoir 7 is 3000-4000 m; the CO is2The injection well 3 adopts a three-opening well body structure, wherein one opening and the other opening are drilled in an overlying rock stratum of a dry hot rock geothermal reservoir 7 and are respectively arranged in a surface casing 4 and a technical casing 5 for well cementation; the single-branch horizontal well landing point 25 is located in the dry hot rock geothermal reservoir 7, the three-opening horizontal well section drills 800-1000 m in the dry hot rock geothermal reservoir 7, and after drilling is completed, the horizontal well section is lowered into the production casing 6 for well cementation.
(b) In CO2Both sides of horizontal well section 3-3 of injection well 3 and CO2Constructing a multi-opening geothermal exploitation well 19 at a position of 250-300 m away from the plane of a horizontal well section 3-3 of an injection well 3; the geothermal exploitation wells 19 are all vertical wells and are positioned in CO2Each side of a plurality of wells on two sides of the horizontal well section of the injection well 3 is 4-5, and the well mouth connecting line of the single-side geothermal exploitation well 19 is consistent with the direction of the stratum; the geothermal exploitation well 19 adopts a three-opening well body structure, wherein one opening and the other opening are drilled in an overlying rock layer of the dry hot rock geothermal reservoir 7 and are respectively put into a surface casing 20 and a technical casing 21 for well cementation; and drilling three times till 80m below the geothermal reservoir 7 of the dry hot rock, and then, drilling three times, and placing a production casing 22 for well cementation.
(c) To CO2The horizontal well section 3-3 of the injection well 3 is staged perforated and fractured from the toe end 3-4 and simultaneously, CO is reacted with2The geothermal exploitation wells 19 adjacent to the fracturing sections 26 on the plane of the injection well 3 are perforated and fractured to reach CO2Synchronous fracturing of the injection well 3 and the geothermal exploitation well 19 to cause CO2The injection well segmented fracturing network 8 is communicated with a geothermal exploitation well fracturing network 9; CO 22In the synchronous fracturing process of the injection well 3 and the geothermal exploitation well 19, the in-well microseism fracturing monitoring method is adopted for evaluationThe occurrence of artificial fractures in the hot dry rock geothermal reservoir 7; the CO is2Dividing a horizontal well section of an injection well 3 into 8-10 fracturing sections with equal length, sequentially performing fracturing construction from 3-3 toe ends 3-4 of the horizontal well section, and controlling the length of a single fracturing section to be 80-100 m; 3-4 clusters of single fracturing section perforation, wherein the length of a single cluster perforation is 1.5-2.0 m, the density of the perforation is 16 bullets/m, and the fracturing construction adopts a mode of 'optical sleeve injection fracturing + bridge plug packing segmentation'; the geothermal exploitation well 19 is continuously perforated in the hot dry rock geothermal reservoir 7, the length of a perforation section is 4.0-6.0 m, the hole density is 16 bullets/m, and the fracturing construction adopts a light sleeve injection fracturing mode.
(d) In CO2Selecting a sidetrack position 27 in a straight well section 3-1 of an injection well 3, sidetrack a branch horizontal well 3-5, after the branch horizontal well 3-5 is drilled, hanging a technical casing 11 on a sidetrack branch deflecting section 3-7 for well completion, drilling a branch horizontal well section 3-6 with the length of 800-1000 m from a landing point 24 of the sidetrack branch horizontal well 3-5 along the deep coal reservoir layer 10, and putting a horizontal well section screen pipe 12 in the sidetrack branch horizontal well section 3-6 for well completion; the CO is2A sidetracking position 27 of a straight well section 3-1 of the injection well 3 is 250-300 m above the deep coal reservoir 10; after the sidetracking branch horizontal well 3-5 is drilled, the sidetracking branch deflecting section 3-7 hangs the technical casing 11 to complete the well, and the sidetracking branch horizontal well section 3-6 is laid into the sieve tube 12 to complete the well; the technical casing 11 of the sidetracking branch deflecting section has the same pipe diameter as the horizontal well section screen pipe 12 and is connected through a casing collar.
(e) In CO2The method comprises the following steps that 8-10 coal bed gas exploitation wells 15 are constructed on the ground 1 at the positions, 200-250 m away from the plane 3-6 of a horizontal well section, of two sides of a sidetracking branch horizontal well 3-5 of an injection well 3, the coal bed gas exploitation wells 15 are continuously perforated in a deep coal reservoir 10, and after perforation completion, the deep coal reservoir 10 around a shaft of the coal bed gas exploitation wells 15 is subjected to permeability transformation in a hydraulic fracturing mode; the coal bed gas production wells 15 are all vertical wells and are positioned in CO2Drilling two sides of a branched horizontal well 3-5 at each side of an injection well 3, wherein the connecting line of the well mouths of a single-side coal bed gas exploitation well 15 is consistent with the direction of the stratum; the length of a perforation section of the coal bed gas production well 15 in the deep coal reservoir 10 for continuous perforation is 3.0-5.0 m, and the hole density is 16 bullets/m; the coalbed methane production well 15 adopts a three-opening well body structure, wherein one opening and the second opening are covered on the deep coal reservoir 10Drilling in a rock stratum, and respectively setting a surface casing 16 and a technical casing 17 for well cementation; and drilling the three openings to 50m below the deep coal reservoir 10, and then, drilling the three openings into a production casing 18 for well cementation.
(f) Fracturing construction is carried out in a mode of 'optical sleeve injection fracturing', in the fracturing process of a deep coal reservoir (10), a ground micro-seismic fracturing monitoring method is adopted to monitor the generation condition of a fracturing net 13 of a coal bed gas exploitation well, after the fracturing construction of the coal bed gas exploitation well 15 is finished, a drainage and exploitation pipe column is put into a shaft of the coal bed gas exploitation well 15, a drainage and exploitation device is installed on the ground, and drainage and gas exploitation operations are carried out; the discharging and extracting pipe column which is arranged in the shaft of the coal bed gas exploitation well 15 in a downward mode comprises a pipe pump, an oil pipe, an oil pumping pipe, a pressure gauge, a gas anchor and a water anchor, and the discharging and extracting device installed on the ground comprises a beam pumping unit 14, a gas-water pipeline, a rotary valve, a pressure gauge, a flow meter and a gas-water separator which are connected in sequence.
(g) By using CO2The injection pump 2 will carry the CO on board2CO in the tank 12Injection into CO by continuous injection2In the injection well 3, the bottom flowing pressure is controlled by the coal bed gas exploitation well 15 to discharge water and produce gas, and the top pressure is controlled by the geothermal exploitation well 19 to produce supercritical CO2(scCO2) On the one hand using CO2To CH4The replacement and displacement effects of the coal bed gas extraction well 15 improve the gas production effect of the coal bed gas extraction well 15 and the coal bed gas recovery ratio in the deep coal reservoir 10; on the other hand, with deep supercritical scCO2Extracting geothermal energy in a dry hot rock geothermal reservoir 7 for a cycle fluid and utilizing supercritical scCO2The generator 23 converts geothermal energy into electric energy; the CO is2Continuous injection mode, CO2The initial injection speed is 80 t/d; when CO is present2When the pressure of the well head of the injection well 3 is lower than 20MPa, the CO is gradually increased in a 2t/d injection increasing mode2Wellhead pressure of injection well 3; when CO is present2When the pressure of the well head of the injection well 3 reaches 20MPa, constant CO is adopted2Injecting in a speed mode; controlling the pressure of a 19 wellhead of the geothermal exploitation well to be 10 MPa; the coalbed methane exploitation well 15 adopts a discharging and exploiting control mode of daily amplitude reduction of constant bottom-hole flowing pressure in the early stage and adopts a discharging and exploiting control mode of stable bottom-hole flowing pressure in the later stage.

Claims (10)

1. A method for mining deep coal bed gas and dry hot rock type geothermal combined coal bed gas is characterized by comprising the following steps:
(a) constructing a straight well section (3-1), a deflecting well section (3-2) and a horizontal well section (3-3) on the ground (28) of the occurrence area of the dry heat rock geothermal reservoir (7) and the deep coal reservoir (10) as CO2Single branch horizontal well of injection well (3), CO2The injection well (3) is vertically deep until the burial depth of the hot dry rock geothermal reservoir (7) is 3000-4000 m;
(b) in the CO2Both sides of the horizontal well section (3-3) of the injection well (3) and CO2Constructing a plurality of geothermal exploitation wells (19) at the position 250-300 m away from the plane of the horizontal well section (3-3) of the injection well (3);
(c) to CO2The horizontal well section (3-3) of the injection well (3) is subjected to staged perforation and fracturing from the toe end (3-4), and simultaneously, the horizontal well section and the CO are subjected to staged perforation and fracturing2The geothermal exploitation wells (19) which are adjacent to each fracturing section (26) on the plane of the injection well (3) are perforated and fractured to reach CO2The injection well (3) and the geothermal exploitation well (19) are synchronously fractured to ensure that CO is generated2The injection well segmented fracturing network (8) is communicated with the geothermal exploitation well fracturing network (9); CO 22In the synchronous fracturing process of the injection well (3) and the geothermal exploitation well (19), evaluating the generation condition of artificial fractures in the dry-hot rock geothermal reservoir (7) by adopting a micro-seismic fracturing monitoring method in the well;
(d) in CO2Selecting a sidetrack drilling position (27) in a straight well section (3-1) of an injection well (3), sidetrack drilling a branch horizontal well (3-5), after the branch horizontal well (3-5) is drilled, hanging a technical casing (11) in a sidetrack branch deflecting section (3-7) for well completion, drilling a branch horizontal well section (3-6) with the length of 800-1000 m from a landing point (24) of the sidetrack branch horizontal well (3-5) along the direction of a deep coal reservoir (10), and putting a horizontal well section sieve tube (12) into the sidetrack branch horizontal well section (3-6) for well completion;
(e) in CO2Constructing a multi-hole coalbed methane exploitation well (15) on the ground (1) at the position with the plane distance of 200-250 m between the two sides of the side-drilling branch horizontal well (3-5) of the injection well (3) and the horizontal well section (3-6), taking the deep coal reservoir layer (10) well section as a continuous perforation section of the coalbed methane exploitation well (15), and performing hydraulic fracturing on the deep coal reservoir layer (10) around the shaft of the coalbed methane exploitation well (15) by adopting a hydraulic fracturing mode after perforation completionModifying permeability;
(f) the permeability of the deep coal reservoir (10) is reformed by adopting fracturing construction in a mode of 'optical sleeve injection fracturing', in the fracturing process, a ground micro-seismic fracturing monitoring method is adopted to monitor the generation condition of a fracturing net (13) of the coal bed gas exploitation well, after the fracturing construction of the coal bed gas exploitation well (15) is finished, a drainage and exploitation pipe column is put into a shaft of the coal bed gas exploitation well (15), and a drainage and exploitation device is installed on the ground to perform drainage and gas exploitation operation;
(g) by using CO2The injection pump (2) will carry the CO on board2CO in the tank (1)2Injection into CO by continuous injection2In the injection well (3), the bottom flowing pressure is controlled by the coal bed gas exploitation well (15) to discharge water and produce gas, and the pressure of the wellhead is controlled by the geothermal exploitation well (19) to produce supercritical scCO2On the one hand using CO2To CH4The replacement and displacement effects of the coal bed gas extraction well (15) can improve the gas production effect of the coal bed gas extraction well and the coal bed gas recovery ratio in the deep coal reservoir (10); on the other hand, with deep supercritical scCO2Extracting geothermal energy in a dry hot rock geothermal reservoir (7) for a circulating working medium and utilizing supercritical scCO2The generator (23) converts geothermal energy into electrical energy.
2. The method of combined geothermal exploitation of deep coal bed methane and dry hot rock type according to claim 1, wherein: in step (a), the CO2The injection well (3) adopts a three-opening well body structure, wherein one opening and the other opening are drilled in an overlying rock stratum of a dry hot rock geothermal reservoir (7) and are respectively put into a surface casing (4) and a technical casing (5) for well cementation; the single-branch horizontal well landing point (25) is located in the hot dry rock geothermal reservoir (7), the three-opening horizontal well section drills 800-1000 m in the hot dry rock geothermal reservoir (7), and after drilling is completed, the horizontal well section is placed into the production casing (6) for well cementation.
3. The method of combined geothermal exploitation of deep coal bed methane and dry hot rock type according to claim 1, wherein: in the step (b), the multiple geothermal exploitation wells (19) are all vertical wells and are positioned in the CO24-5 openings are formed in each of two sides of the horizontal well section of the injection well (3), and the well opening connecting line of the single-side geothermal exploitation well (19) is consistent with the direction of the stratum.
4. The method of deep coal bed methane and dry hot rock type geothermal combined mining according to claim 1 or 3, characterized by: in the step (b), the geothermal exploitation well (19) adopts a three-opening well body structure, wherein one opening and the other opening drill in an overlying rock layer of the dry hot rock geothermal reservoir (7), and a surface casing (20) and a technical casing (21) are respectively put into the well for cementing; and drilling three times to 80m below the geothermal reservoir (7) of the dry hot rock, and then drilling three times and putting a production casing (22) for well cementation.
5. The method of combined geothermal exploitation of deep coal bed methane and dry hot rock type according to claim 1, wherein: in step (c), the CO2Dividing a horizontal well section of an injection well (3) into 8-10 fracturing sections with equal length, sequentially performing fracturing construction from toe ends (3-4) of the horizontal well sections (3-3), and controlling the length of a single fracturing section to be 80-100 m; 3-4 clusters of single fracturing section perforation, wherein the length of a single cluster perforation is 1.5-2.0 m, the density of the perforation is 16 bullets/m, and the fracturing construction adopts a mode of 'optical sleeve injection fracturing + bridge plug packing segmentation'; the geothermal exploitation well (19) is continuously perforated in a dry hot rock geothermal reservoir (7), the length of a perforation section is 4.0-6.0 m, the hole density is 16 bullets/m, and the fracturing construction adopts a light sleeve injection fracturing mode.
6. The method of combined geothermal exploitation of deep coal bed methane and dry hot rock type according to claim 1, wherein: in step (d), the CO2A sidetracking position (27) of a straight well section (3-1) of the injection well (3) is positioned 250-300 m above the deep coal reservoir (10); the hanging technical casing (11) of the sidetracking branch deflecting section has the same pipe diameter as the horizontal well section screen pipe (12) and is connected through a casing coupling.
7. The method of combined geothermal exploitation of deep coal bed methane and dry hot rock type according to claim 1, wherein: in the step (e), the coal bed gas production wells (15) are all vertical wells and are positioned in CO24-5 holes are formed in each of two sides of a sidetracking branch horizontal well (3-5) of the injection well (3), and the well mouth connecting line of the single-side coalbed methane mining well (15) is consistent with the direction of the stratum;the length of a perforation section of the coal bed gas production well (15) in the deep coal reservoir (10) for continuous perforation is 3.0-5.0 m, and the hole density is 16 bullets/m.
8. The method of deep coal bed methane and dry hot rock type geothermal combined mining according to claim 1 or 7, characterized by: in the step (e), the coalbed methane production well (15) adopts a three-opening well body structure, wherein one opening and the other opening are drilled in an overlying rock stratum of the deep coal reservoir (10) and are respectively put into a surface casing (16) and a technical casing (17) for well cementation; and drilling three openings to 50m below the deep coal reservoir (10), and then drilling three openings and placing a production casing (18) for well cementation.
9. The method of combined geothermal exploitation of deep coal bed methane and dry hot rock type according to claim 1, wherein: in the step (f), the discharging and extracting pipe column which is arranged in the shaft of the coal bed gas exploitation well (15) in a downward mode comprises a pipe pump, an oil pipe, an oil pumping pipe, a pressure gauge, a gas anchor and a water anchor which are connected in sequence, and the discharging and extracting device installed on the ground comprises a beam pumping unit (14), a gas-water pipeline, a rotary valve, a pressure gauge, a flow meter and a gas-water separator which are connected in sequence.
10. The method of combined geothermal exploitation of deep coal bed methane and dry hot rock type according to claim 1, wherein: in step (g), the CO2In a continuous injection mode, CO2The initial injection speed is 80 t/d;
when CO is present2When the wellhead pressure of the injection well (3) is lower than 20MPa, the CO is gradually increased in a 2t/d injection increasing mode2Wellhead pressure of the injection well (3); when CO is present2When the pressure of the well mouth of the injection well (3) reaches 20MPa, constant CO is adopted2Injecting in a speed mode;
the wellhead pressure of the geothermal exploitation well (19) is controlled at 10 MPa; the coal bed gas exploitation well (15) adopts a discharging and exploiting control mode of constant daily descending amplitude of bottom-hole flowing pressure in the early stage and adopts a discharging and exploiting control mode of stable bottom-hole flowing pressure in the later stage.
CN202111196396.8A 2021-10-14 2021-10-14 Method for combined exploitation of deep coal bed gas and dry hot rock type geothermal Pending CN113738317A (en)

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CN114673480B (en) * 2022-05-07 2022-11-22 中国矿业大学 Based on heterogeneous CO 2 Multi-lateral-layer position type geothermal enhanced mining method for medium
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