A system for extracting gas from a tectonically-deformed coal seam in-situ by depressurizing a horizontal well cavity is provided. A horizontal well is constructed by a horizontal well drilling and reaming subsystem and adjoins a vertical well to form a U-shaped well, and a horizontal section of the horizontal well is reamed to enlarge hole diameter. A horizontal well hole-collapse cavity-construction depressurization excitation subsystem performs pressure-pulse excitation and stress release on the horizontal well of tectonically-deformed coal bed methane, and hydraulically displaces a coal-liquid-gas mixture such that the mixture is conveyed towards a vertical well section along a depressurizing space. A product lifting subsystem further pulverizes the coal and lifts the mixture towards a wellhead of a vertical well. A gas-liquid-solid separation subsystem separates the coal, liquid and gas. A monitoring and control subsystem detects and controls the operation conditions and the execution processes of technical equipment in real time.
E21B 7/18 - Forage par action de jets de liquides ou de gaz, avec ou sans entraînement de grenaille
E21B 10/32 - Trépans avec une partie pilote, c.-à-d. trépans comportant un organe coupant piloteTrépans pour élargir le trou de forage, p. ex. alésoirs à organes coupants expansibles
E21B 15/04 - Supports pour la machine de forage, p. ex. tours de forage ou mâts de forage spécialement adaptés au forage dirigé, p. ex. appareils pour trous inclinés
E21C 41/18 - Procédés d'exploitation minière souterraineTracés à cet effet pour la lignite ou le charbon
E21F 17/18 - Adaptations particulières des dispositifs de signalisation ou d'alarme
2.
Method of extracting gas from tectonically-deformed coal seam in-situ by depressurizing horizontal well cavity
A method of extracting gas from a tectonically-deformed coal seam in-situ by depressurizing a horizontal well cavity is provided. A horizontal well drilling and reaming subsystem constructs a U-shaped well in which a horizontal well adjoins a vertical well, and performs a reaming process on a horizontal section of the horizontal well to enlarge a hole diameter. A horizontal well hole-collapse cavity-construction depressurization excitation subsystem performs pressure-pulse excitation and stress release on the horizontal well of tectonically-deformed coal bed methane, and hydraulically displaces a coal-liquid-gas mixture such that the mixture is conveyed towards a vertical well section along a depressurizing space. A product lifting subsystem pulverizes the coal and lifts the mixture towards a wellhead of a vertical well. A gas-liquid-solid separation subsystem separates the coal, liquid and gas. A monitoring and control subsystem detects and controls the operation conditions and the execution processes of technical equipment in real time.
E21B 43/12 - Procédés ou appareils pour commander l'écoulement du fluide extrait vers ou dans les puits
E21B 41/00 - Matériel ou accessoires non couverts par les groupes
E21B 47/00 - Relevés dans les trous de forage ou dans les puits
E21B 10/32 - Trépans avec une partie pilote, c.-à-d. trépans comportant un organe coupant piloteTrépans pour élargir le trou de forage, p. ex. alésoirs à organes coupants expansibles
E21B 43/34 - Aménagements pour séparer les matériaux produits par le puits
E21B 7/28 - Élargissement des trous forés, p. ex. par forage à contresens
ANHUI UNIVERSITY OF SCIENCE AND TECHNOLOGY (Chine)
WUHAN INSTITUTE OF TECHNOLOGY (Chine)
Inventeur(s)
Sang, Shuxun
Wang, Haiwen
Zhou, Xiaozhi
Cao, Liwen
Liu, Shiqi
Liu, Huihu
Li, Zicheng
Jia, Jinlong
Huang, Huazhou
Liu, Changjiang
Xu, Hongjie
Wang, Ran
Zhu, Shuyun
Abrégé
A simulation test system for gas extraction from a tectonically-deformed coal seam in-situ by depressurizing a horizontal well cavity. A coal series stratum structure reconstruction and similar material simulation subsystem simulates a tectonically-deformed coal reservoir. A horizontal well drilling and reaming simulation subsystem constructs a U-shaped well in which a horizontal well adjoins a vertical well, and performs a reaming process on a horizontal section thereof. A horizontal well hole-collapse cavity-construction depressurization excitation simulation subsystem performs pressure-pulse excitation and stress release on the horizontal well, and hydraulically displaces a coal-liquid-gas mixture such that the mixture is conveyed towards a vertical well section. A product lifting simulation subsystem further pulverizes the coal and lifts the mixture. A gas-liquid-solid separation simulation subsystem separates the coal, liquid and gas. A monitoring and control subsystem detects and controls the operation and the execution processes of equipment in real time.
E21B 49/00 - Test pour déterminer la nature des parois des trous de forageEssais de couchesProcédés ou appareils pour prélever des échantillons du terrain ou de fluides en provenance des puits, spécialement adaptés au forage du sol ou aux puits
G06F 30/20 - Optimisation, vérification ou simulation de l’objet conçu
ANHUI UNIVERSITY OF SCIENCE AND TECHNOLOGY (Chine)
WUHAN INSTITUTE OF TECHNOLOGY (Chine)
Inventeur(s)
Sang, Shuxun
Zhou, Xiaozhi
Cao, Liweng
Liu, Shiqi
Wang, Haiwen
Liu, Huihu
Li, Zicheng
Jia, Jinlong
Huang, Huazhou
Liu, Changjiang
Xu, Hongjie
Wang, Ran
Zhu, Shuyun
Abrégé
A simulation test method for gas extraction from a tectonically-deformed coal seam in-situ by depressurizing a horizontal well cavity. A coal series stratum structure reconstruction and similar material simulation subsystem simulates a tectonically-deformed coal reservoir. A horizontal well drilling and reaming simulation subsystem constructs a U-shaped well in which a horizontal well adjoins a vertical well, and performs a reaming process on a horizontal section thereof. A horizontal well hole-collapse cavity-construction depressurization excitation simulation subsystem performs pressure-pulse excitation and stress release on the horizontal well, and hydraulically displaces a coal-liquid-gas mixture such that the mixture is conveyed towards a vertical well section. A product lifting simulation subsystem further pulverizes the coal and lifts the mixture. A gas-liquid-solid separation simulation subsystem separates the coal, liquid and gas. A monitoring and control subsystem detects and controls the operation and the execution processes of equipment in real time.
A device for simulating pressure relief of an in-situ coalbed methane horizontal well in tectonically-deformed coal, and a simulation method. A high-pressure pulsating fluid injection module comprises a hydraulic pump (2), a hydraulic cylinder (5), a high-modulus spring (6), an impact pressure cavity (9), and a constant-speed constant-pressure pump (14). The hydraulic pump (2) and the hydraulic cylinder (5) are in hydraulic connection. A right end of a guide rod (7) is fixedly connected to a right installation plate of the high-modulus spring (6), and a left end thereof passes through a left installation plate of the high-modulus spring (6). An electromagnetic clutch (11) is disposed between a piston rod of the hydraulic cylinder (5) and the guide rod (7). A left end of an impact piston (10) in the impact pressure cavity (9) is fixedly connected to the right installation plate of the high-modulus spring (6). The impact pressure cavity (9) is in communication with an outlet of the constant-speed constant-pressure pump (14), and has an outlet pipe in communication with a downhole jetting module. The right installation plate of the high-modulus spring (6) is provided with a displacement sensor (8). The downhole jetting module is disposed within a material similar to a coal bed. The device and the method simulate stress relief of a horizontal well (19.2) in a coal reservoir having a soft structure, so as to provide guidance and a basis for pressure relief and permeability enhancement in actual mining of in-situ coalbed methane in tectonically-deformed coal.
E21B 43/00 - Procédés ou dispositifs pour l'extraction de pétrole, de gaz, d'eau ou de matériaux solubles ou fusibles ou d'une suspension de matières minérales à partir de puits
6.
COALBED METHANE HORIZONTAL WELL HOLE COLLAPSE PRESSURE RELIEF MINING SIMULATION TEST SYSTEM
A coalbed methane horizontal well hole collapse pressure relief mining simulation test system. A coal reservoir is constructed by means of reconstruction of a coal measure strata structure and simulation of a similar material simulation subsystem; a pressure pulsation excitation pressure relief simulation subsystem achieves horizontal well pressure pulsation excitation and stress release, a coal-liquid-gas mixture is displaced hydraulically to be migrated to a straight well section; an electric simulation subsystem achieves detection of electric field distribution in similar materials, a product separation and detection subsystem separates and weighs coal, liquid and gas, and a data acquisition and control subsystem detects and controls the operation and implementation processes of equipment in real time. The system can achieve the simulation of soft-structured coal reservoir horizontal well hole collapse and stress release, simulate migration features of a gas phase, a liquid phase and a solid phase in a pressure relief space, simulate the separation process of the produced mixture, and obtain the law between coal reservoir pressure relief and gas desorption change and the dynamic law between a complex seepage field after coal measure strata excitation and pressure relief and horizontal well section flow.
E21B 43/00 - Procédés ou dispositifs pour l'extraction de pétrole, de gaz, d'eau ou de matériaux solubles ou fusibles ou d'une suspension de matières minérales à partir de puits
7.
COALBED METHANE HORIZONTAL WELL HOLE COLLAPSE DE-STRESSED MINING SIMULATION TEST METHOD
A coalbed methane horizontal well hole collapse de-stressed mining simulation test method. A coal reservoir is constructed by means of reconstruction of a coal measure strata structure and simulation of a similar material simulation subsystem. Pressure pulsation excitation and stress release of a horizontal well are achieved by a pressure pulsation excitation pressure-relief simulation subsystem, and a coal-liquid-gas mixture is displaced hydraulically to be migrated to a straight well section. Detection of electric field distribution in similar materials is achieved by an electric simulation subsystem. A product separation and detection subsystem separates and weighs coal, liquids and gases, and a data acquisition and control subsystem detects and controls the operation and implementation processes of equipment in real time. The method can achieve the simulation of horizontal well hole collapse and stress release of a soft-structured coal reservoir, simulate the migration features of a gas phase, a liquid phase and a solid phase in pressure-relief space, simulate the separation process of the produced mixture, and obtain the law between coal reservoir pressure relief and gas desorption change and the dynamic law between a complex seepage field after coal measure strata excitation and pressure relief and horizontal well section flow.
E21B 49/00 - Test pour déterminer la nature des parois des trous de forageEssais de couchesProcédés ou appareils pour prélever des échantillons du terrain ou de fluides en provenance des puits, spécialement adaptés au forage du sol ou aux puits
8.
METHOD OF EXTRACTING GAS FROM TECTONICALLY-DEFORMED COAL SEAM IN-SITU BY DEPRESSURIZING HORIZONTAL WELL CAVITY
The invention relates to the field of coal seam gas extraction. Disclosed is a method of extracting gas from a tectonically-deformed coal seam in-situ by depressurizing a horizontal well cavity. A horizontal well drilling and reaming subsystem (1, 10) constructs a U-shaped well in which a horizontal well adjoins a vertical well, and performs a reaming process on a horizontal section of the horizontal well (11) to enlarge hole diameter. A horizontal well hole-collapse cavity-construction depressurization excitation subsystem (14, 15, 16) performs pressure-pulse excitation and stress release on the horizontal well of tectonically-deformed coal seam gas, and hydraulically displaces a coal-liquid-gas mixture such that the mixture is conveyed towards a vertical well section along a depressurizing space. A product lifting subsystem (8) further pulverizes the coal and lifts the mixture towards a wellhead of a vertical well (7). A gas-liquid-solid separation subsystem (5, 4) separates the coal, liquid and gas. A monitoring and control subsystem detects and controls the operation conditions and the execution processes of technical equipment in real time. The method enables the completion of a large-diameter horizontal well in a loose tectonically-deformed coal reservoir, horizontal well cavity-constructing stress release, effective lifting of mixed fluids, and efficient separation of produced mixtures, thereby achieving efficient in-situ extraction of tectonically-deformed coal seam gas.
The invention discloses a coalbed methane horizontal well hole collapse cave-building pressure relief developing system and method. An inlet of an abrasive mixing device (6) in the system separately is communicated with a liquid storage tank (1) and an abrasive tank (5), an outlet is communicated with an inlet of a ground power device (7), an outlet of the ground power device (7) is communicated with an underground injection device (8), and the underground injection device (8) is positioned at the position, near a wellhead, of the horizontal section of a horizontal well. After chambering cave-building barefoot well completion of the horizontal well is completed, a mixed fluid is delivered to the underground at a certain frequency by means of the ground power device (7) and sprayed out by means of the underground injection device (8), so that the pressure pulsation excitation and stress release in the horizontal well of the structured coalbed methane are realized, and the coal-liquid-gas mixture moves along the pressure relief space to the vertical well section by means of hydraulic displacement. The system and method can realize the pressure relief and stress release of tectonic coal in-situ horizontal well hole collapse cave-building and provide a basis for realizing efficient and continuous mining of the tectonic coal in-situ coalbed methane.
ANHUI UNIVERSITY OF SCIENCE AND TECHNOLOGY (Chine)
WUHAN INSTITUTE OF TECHNOLOGY (Chine)
Inventeur(s)
Sang, Shuxun
Zhou, Xiaozhi
Cao, Liweng
Liu, Shiqi
Wang, Haiwen
Liu, Huihu
Li, Zicheng
Jia, Jinlong
Huang, Huazhou
Liu, Changjiang
Xu, Hongjie
Wang, Ran
Zhu, Shuyun
Abrégé
A simulation test method for gas extraction from a tectonically-deformed coal seam in-situ by depressurizing a horizontal well cavity. A coal series stratum structure reconstruction and similar material simulation subsystem (1) simulates the construction of a coal reservoir. A horizontal well drilling and reaming simulation subsystem (2) constructs a U-shaped well in which a horizontal well (1.11) adjoins a vertical well (1.12), and performs a reaming process on a horizontal section thereof. A horizontal well hole-collapse cavity-construction depressurization excitation simulation subsystem (3) performs pressure-pulse excitation and stress release on the horizontal well, and hydraulically displaces a coal-liquid-gas mixture such that the mixture is conveyed towards a vertical well section. A product lifting simulation subsystem (4) further pulverizes the coal and lifts the mixture. A gas-liquid-solid separation simulation subsystem (5) separates the coal, liquid and gas. A monitoring and control subsystem detects and controls the operation and the execution processes of equipment in real time. The method enables the simulation of completion of a large-diameter horizontal well in a loose tectonically-deformed coal reservoir, horizontal well cavity-construction stress release, effective lifting of mixed fluids, and efficient separation of produced mixtures, thereby providing guidance for efficient in-situ extraction of tectonically-deformed coal seam gas.
E21B 43/00 - Procédés ou dispositifs pour l'extraction de pétrole, de gaz, d'eau ou de matériaux solubles ou fusibles ou d'une suspension de matières minérales à partir de puits
E21F 7/00 - Procédés ou dispositifs pour enlever les gaz, avec ou sans utilisation ultérieure de ceux-ci à une fin quelconque
11.
SYSTEM FOR EXTRACTING GAS FROM TECTONICALLY-DEFORMED COAL SEAM IN-SITU BY DEPRESSURIZING HORIZONTAL WELL CAVITY
The invention relates to the field of coal seam gas extraction. Disclosed is a system for extracting gas from a tectonically-deformed coal seam in-situ by depressurizing a horizontal well cavity. The system comprises a horizontal well (11) constructed by a horizontal well drilling and reaming subsystem and adjoining a vertical well (7) to form a U-shaped well, and a horizontal section of the horizontal well (11) is reamed to enlarge hole diameter. A horizontal well hole-collapse cavity-construction depressurization excitation subsystem performs pressure-pulse excitation and stress release on the horizontal well of tectonically-deformed coal seam gas, and hydraulically displaces a coal-liquid-gas mixture such that the mixture is conveyed towards a vertical well section along a depressurizing space. A product lifting subsystem further pulverizes the coal and lifts the mixture towards a wellhead of a vertical well. A gas-liquid-solid separation subsystem separates the coal, liquid and gas. A monitoring and control subsystem detects and controls the operation conditions and the execution processes of technical equipment in real time. The system enables the completion of a large-diameter horizontal well in a loose tectonically-deformed coal reservoir, horizontal well cavity-constructing stress release, effective lifting of mixed fluids, and efficient separation of produced mixtures, thereby achieving efficient in-situ extraction of tectonically-deformed coal seam gas.
ANHUI UNIVERSITY OF SCIENCE AND TECHNOLOGY (Chine)
WUHAN INSTITUTE OF TECHNOLOGY (Chine)
Inventeur(s)
Sang, Shuxun
Wang, Haiwen
Zhou, Xiaozhi
Cao, Liweng
Liu, Shiqi
Liu, Huihu
Li, Zicheng
Jia, Jinlong
Huang, Huazhou
Liu, Changjiang
Xu, Hongjie
Wang, Ran
Zhu, Shuyun
Abrégé
A simulation test system for gas extraction from a tectonically-deformed coal seam in-situ by depressurizing a horizontal well cavity. A coal series stratum structure reconstruction and similar material simulation subsystem (1) simulates the construction of a coal reservoir. A horizontal well drilling and reaming simulation subsystem (2) constructs a U-shaped well in which a horizontal well (1.11) adjoins a vertical well (1.12), and performs a reaming process on a horizontal section thereof. A horizontal well hole-collapse cavity-construction depressurization excitation simulation subsystem (3) performs pressure-pulse excitation and stress release on the horizontal well, and hydraulically displaces a coal-liquid-gas mixture such that the mixture is conveyed towards a vertical well section. A product lifting simulation subsystem (4) further pulverizes the coal and lifts the mixture. A gas-liquid-solid separation simulation subsystem (5) separates the coal, liquid and gas. A monitoring and control subsystem detects and controls the operation and the execution processes of equipment in real time. The system enables the simulation of completion of a large-diameter horizontal well in a loose tectonically-deformed coal reservoir, horizontal well cavity-construction stress release, effective lifting of mixed fluids, and efficient separation of produced mixtures, thereby providing guidance for efficient in-situ extraction of tectonically-deformed coal seam gas.
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