Underground gas channeling treatment device

Abstract

The invention discloses an underground gas channeling treatment device. The device comprises a ground control and processing system, a conveying system, an underground spraying device and a dynamic monitoring feedback module. The ground control and processing system comprises a logging truck, a control center and an integrated cable, the logging truck and the control center are both connected with the integrated cable and used for processing data and controlling the underground device to operate, and the other end of the integrated cable is connected with the underground device and used for transmitting data and electric power; the conveying system comprises a coiled tubing vehicle, a coiled tubing, a liquid storage tank (a), a liquid storage tank (b), a conveying pipeline (a) and a conveying pipeline (b), and is used for conveying a solution and conveying the underground spraying device and the dynamic monitoring feedback module into a well; the underground spraying device comprises a hydraulic valve (a), a hydraulic valve (b), an intermediate container, an impeller, an atomizing nozzle and a centralizer, and is used for spraying a bacterium-calcium mixed solution to a gas channeling layer; the dynamic monitoring feedback module comprises a permanent magnet (a), a permanent magnet (b) and a transmitting and receiving coil, and is used for accurately positioning a gas channeling layer position and feeding back bacterium and calcium mixed liquid spraying and microbial reaction effects. The device is high in practicability, and an effective tool is provided for achieving precise biological plugging of the underground gas channeling position.

Description

Technical Field

[0001] The present invention relates to a downhole gas channeling treatment device, belonging to the technical field of oil and gas development. Background Art

[0002] Gas channeling in oil and gas wells is a common problem in oil and gas development. According to statistics, about 35%-50% of oil and gas wells globally have varying degrees of gas channeling problems. The main manifestation is that gases (such as CO2, CH4, H2S, etc.) undergo non-targeted cross-flow through the wellbore annulus, cement microcracks, or high-permeability formation channels. The chain problems caused by gas channeling seriously threaten the economic benefits, safety, and environmental sustainability of oil and gas fields.

[0003] Microbially induced mineralization plugging generates calcium carbonate deposits through the metabolism of bacteria, possessing the advantages of self-adaptive plugging and environmental friendliness. The technology of the bacterial-calcium mixture solution with Bacillus pasteurii as the core has become a research hotspot. However, current related research is still in the preliminary stage, mostly laboratory experiments and numerical simulations, and field applications are not yet mature. Therefore, for the field application of microbially induced mineralization plugging, a device integrating bacterial solution transportation, plugging, and monitoring needs to be manufactured. Summary of the Invention

[0004] The present invention provides a downhole gas channeling treatment device.

[0005] The technical solution of the present invention is as follows:

[0006] A downhole gas channeling treatment device, characterized in that the downhole gas channeling treatment device includes a ground control and processing system, a transportation system, a downhole spraying device, and a dynamic monitoring and feedback module;

[0007] The ground control and processing system includes a control center, a logging vehicle, and an integrated cable. Both the logging vehicle and the control center are connected to the integrated cable, used for data processing and controlling the operation of downhole devices. The other end of the integrated cable is connected to the downhole device, used for transmitting data and electricity;

[0008] The transportation system includes a coiled tubing truck, coiled tubing, liquid storage tank (a), liquid storage tank (b), transportation pipeline (a), and transportation pipeline (b);

[0009] Among them, liquid storage tank (a) and liquid storage tank (b) store Bacillus pasteurii suspension and urea-CaCl2 nutrient solution respectively. Transportation pipeline (a) is used for transporting Bacillus pasteurii suspension, and transportation pipeline (b) is used for transporting urea-CaCl2 nutrient solution. The integrated cable, transportation pipeline (a), and transportation pipeline (b) are placed inside the coiled tubing and transported to the downhole through the coiled tubing truck;

[0010] The downhole spraying device includes hydraulic valve (a), hydraulic valve (b), intermediate container, impeller, atomizing nozzle, and centralizer;

[0011] Among them, the hydraulic valve (a) is the control switch of the conveying pipeline (a), and the hydraulic valve (b) is the control switch of the conveying pipeline (b). The upper end of the intermediate container is connected to the conveying pipeline (a) and the conveying pipeline (b) through the hydraulic valve (a) and the hydraulic valve (b). There are three atomizing nozzles, and the coverage angle of each nozzle is 120°, which are evenly distributed around the bottom of the intermediate container. The impeller is located inside the intermediate container, and the centralizer helps to stabilize the device, avoid collision with the wellbore, and reduce the impact of vibration on the equipment;

[0012] The dynamic monitoring and feedback module includes a permanent magnet (a), a permanent magnet (b), and a transmitting and receiving coil;

[0013] Among them, the permanent magnet (a) and the permanent magnet (b) are symmetrically distributed on both sides of the transmitting and receiving coil to generate a static magnetic field. The transmitting and receiving coil is a solenoid coil, which is evenly wound along the axial direction of the device.

[0014] The above-mentioned downhole gas channeling treatment device is characterized in that: the Bacillus pasteurii suspension and the urea-CaCl2 nutrient solution are mixed in a volume ratio of 1:1 to form a bacteria-calcium mixed solution, and calcium carbonate precipitation is generated through microbial induction, which is suitable for biological plugging of gas channeling channels in reservoirs.

[0015] The above-mentioned downhole gas channeling treatment device is further characterized in that: the conveying pipeline (a) and the conveying pipeline (b) adopt a double-channel isolation to convey the solution, effectively preventing precipitation from blocking the channel during the conveying process.

[0016] The above-mentioned downhole gas channeling treatment device is further characterized in that: the impeller is used to stir the solution to ensure the uniformity of the solution and reduce the reaction time.

[0017] The above-mentioned downhole gas channeling treatment device is further characterized in that: the transmitting and receiving coil is used to transmit radio frequency pulses with a specific frequency and receive electrical signals. During the transmitting stage, an alternating current is passed through the coil, and during the receiving stage, the coil is switched to a high-sensitivity receiving circuit. The integrated cable transmits the signal to the logging truck for data processing. The permeability parameter information is calculated through data processing to determine the accurate gas channeling layer position, and it can also judge the spraying effect of the bacteria-calcium mixed solution and the microbial reaction effect, and determine whether to spray the bacteria-calcium mixed solution again at this position until the expected effect is achieved. Description of the Drawings

[0018] Figure 1 is a schematic diagram of a downhole gas channeling treatment device of the present invention;

[0019] Figure 2 is a sectional view of the downhole device structure;

[0020] Reference numerals: 1 - control center, 2 - logging vehicle, 3 - coiled tubing vehicle, 4 - integrated cable, 5 - liquid storage tank (a), 6 - conveying pipeline (a), 7 - liquid storage tank (b), 8 - conveying pipeline (b), 9 - coiled tubing, 10 - adapter, 11 - hydraulic valve (a), 12 - hydraulic valve (b), 13 - intermediate container, 14 - atomizing nozzle, 15 - impeller, 16 - centralizer, 17 - permanent magnet (a), 18 - transmitting and receiving coil, 19 - permanent magnet (b), 20 - energized wire, 21 - spacer layer, 22 - circular channel. Specific implementation manner

[0021] The present invention will be further described below with reference to the accompanying drawings.

[0022] The present invention discloses a downhole gas channeling treatment device, which includes a ground control and processing system, a conveying system, a downhole spraying device, and a dynamic monitoring and feedback module. The ground control and processing system consists of a control center 1, a logging vehicle 3, and an integrated cable 4. The control center 1 and the logging vehicle 2 are both connected to the integrated cable 4 for data processing and controlling the operation of the downhole device. The other end of the integrated cable 4 is connected to the coiled tubing vehicle 3 for transmitting data and power. The conveying system consists of a coiled tubing vehicle 3, coiled tubing 9, liquid storage tank (a) 5, liquid storage tank (b) 7, conveying pipeline (a) 6, and conveying pipeline (b) 8. The liquid storage tank (a) 5 is connected to the coiled tubing vehicle 3 through the conveying pipeline (a) 6, and the liquid storage tank (b) 7 is connected to the coiled tubing vehicle 3 through the conveying pipeline (b) 8. The integrated cable 4, the conveying pipeline (a) 6, and the conveying pipeline (b) 8 are all placed inside the coiled tubing 9 and transported to the downhole. The downhole spraying device consists of a hydraulic valve (a) 11, a hydraulic valve (b) 12, an intermediate container 13, an impeller 15, an atomizing nozzle 14, and a centralizer 16, and is connected to the coiled tubing 9 through an adapter 10. The hydraulic valve (a) 11 and the hydraulic valve (b) 12 are respectively the connection valves for the conveying pipeline (a) 6 and the conveying pipeline (b) 8 to the intermediate container 13. The impeller 15 is located at the bottom of the intermediate container 13. There are three atomizing nozzles 14, and the coverage angle of each nozzle is 120°, which are evenly distributed around the bottom of the intermediate container. The centralizer 16 is located outside the downhole spraying device to increase the stability of the device. The dynamic monitoring and feedback module consists of a permanent magnet (a) 17, a permanent magnet (b) 19, and a transmitting and receiving coil 18. The transmitting and receiving coil 18 is evenly wound along the axial direction of the device and is connected to the integrated cable 4 through an energized wire 20. The permanent magnet (a) 17 and the permanent magnet (b) 19 are fixed and symmetrically distributed at both ends of the transmitting and receiving coil 18. A spacer layer 21 is located below the intermediate container 13 for fixing and supporting the intermediate container 13, and there is a circular channel 22 inside for the energized wire 20 to pass through.

[0023] The operation process of the present invention will be further described in detail.

[0024] In the first step, the suspension of Bacillus pasteurii and the urea-CaCl2 nutrient solution are respectively stored in the liquid storage tank (a) 5 and the liquid storage tank (b) 7. The integrated cable 4, the conveying pipeline (a) 6 and the conveying pipeline (b) 8 are all placed inside the coiled tubing 9. The downhole spraying device and the dynamic monitoring and feedback module are slowly sent into the well through the coiled tubing. During the process of lowering the device, the transmitting and receiving coil 18 continuously emits radio frequency pulses of a specific frequency and receives electrical signals, and the electrical signals are transmitted to the logging truck 2 through the integrated cable 4 for processing to obtain the permeability parameter information at different depths and determine the precise gas channeling layer position.

[0025] In the second step, when the first gas channeling layer position is identified, the control center 1 controls the hydraulic valve (a) 11 and the hydraulic valve (b) 12 to open. The suspension of Bacillus pasteurii and the urea-CaCl2 nutrient solution respectively enter the intermediate container 13 through the conveying pipeline (a) 6 and the conveying pipeline (b) 8. The impeller 15 is started to stir to make the suspension of Bacillus pasteurii and the urea-CaCl2 nutrient solution mix evenly. When an appropriate amount of bacteria-calcium mixture is obtained, the hydraulic valve (a) 11 and the hydraulic valve (b) 12 are closed, and the atomizing nozzle 14 sprays the bacteria-calcium mixture on the target gas channeling position. Calcium carbonate precipitation is generated through microbial induction to achieve the effect of plugging the gas channeling layer position.

[0026] In the third step, after spraying the bacteria-calcium mixture on this gas channeling layer position and reacting for a period of time, the permeability information of this layer position is obtained through the dynamic monitoring and feedback module and the logging truck 2 to judge the spraying of the bacteria-calcium mixture and the microbial reaction situation. If the expected effect is not achieved, repeat the above second step and continue to monitor until the expected effect is achieved.

[0027] In the fourth step, continue to slowly lower the downhole spraying device and the dynamic monitoring and feedback module. When the next gas channeling layer position is identified, repeat the second step and the third step until the bottom of the well is reached to achieve the purpose of plugging all the gas channeling layer positions in the whole well section.

Claims

1. A device for controlling underground gas channeling, characterized in that: The underground gas channeling control device comprises a ground control and processing system, a conveying system, an underground spraying device, and a dynamic monitoring feedback module; The surface control and processing system includes a logging vehicle, a control center and an integrated cable. The logging vehicle and the control center are both connected to the integrated cable for data processing and controlling the operation of the downhole device. The other end of the integrated cable is connected to the downhole device for transmitting data and power. The conveying system comprises a coiled tubing vehicle, a coiled tubing, a liquid storage tank (a), a liquid storage tank (b), a conveying pipeline (a) and a conveying pipeline (b); Wherein, the liquid storage tank (a) and the liquid storage tank (b) store the Bacillus pasteurianus suspension and the urea-CaCl2 nutrient solution respectively, the delivery pipeline (a) is used to deliver the Bacillus pasteurianus suspension, and the delivery pipeline (b) is used to deliver the urea-CaCl2 nutrient solution, and the integrated cable, the delivery pipeline (a) and the delivery pipeline (b) are built in the coiled tubing and are transmitted to the underground by the coiled tubing vehicle; The downhole spraying device comprises a hydraulic valve (a), a hydraulic valve (b), an intermediate container, an impeller, an atomizing nozzle and a centralizer; Wherein, hydraulic valve (a) is the control switch of conveying pipeline (a), hydraulic valve (b) is the control switch of conveying pipeline (b), the upper end of the intermediate container is connected with conveying pipeline (a) and conveying pipeline (b) through hydraulic valve (a) and hydraulic valve (b), there are three atomizing nozzles, each with a coverage angle of 120°, which are evenly distributed around the bottom of the intermediate container, the impeller is located inside the intermediate container, and the centralizer helps to stabilize the device, avoid collision with the well wall, and reduce the impact of vibration on the equipment; The dynamic monitoring feedback module includes a permanent magnet (a), a permanent magnet (b) and a transmitting and receiving coil; The permanent magnet (a) and the permanent magnet (b) are symmetrically distributed on both sides of the transmitting and receiving coils to generate a static magnetic field. The transmitting and receiving coils are solenoid coils that are evenly wound along the axial direction of the device.

2. A downhole gas channeling control device as claimed in claim 1, characterized in that: The Bacillus pasteurianus suspension and the urea-CaCl2 nutrient solution are mixed in a volume ratio of 1:1 to form a bacterial calcium mixed solution, which generates calcium carbonate precipitation through microbial induction and is suitable for biological plugging of gas channeling channels in reservoirs.

3. A downhole gas channeling control device as claimed in claim 1, characterized in that: The delivery pipeline (a) and the delivery pipeline (b) adopt dual-channel isolation to deliver the solution, which effectively prevents the generation of precipitation and blockage of the channel during the delivery process.

4. A downhole gas channeling control device as claimed in claim 1, characterized in that: The impeller is used to stir the solution to ensure the uniformity of the solution and reduce the reaction time.

5. The underground gas channeling control device according to claim 1, characterized in that: The transmitting and receiving coils are used to transmit radio frequency pulses of a specific frequency and receive electrical signals. During the transmitting stage, an alternating current is passed through the coils. During the receiving stage, the coils are switched to a high-sensitivity receiving circuit. The integrated cable transmits the signal to the logging vehicle for data processing. The permeability parameter information is obtained through data processing and calculation, so as to determine the precise layer of gas channeling, judge the effects of the bacteria-calcium mixed liquid spraying and the microbial reaction, and determine whether to spray the bacteria-calcium mixed liquid again at this position in the next step until the expected effect is achieved.

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