Carbon dioxide gas drilling apparatus and method
A carbon dioxide and gas drilling technology, applied in the direction of drilling with liquid/gas jets, etc., can solve the problems of high strength requirements of fluid pipelines, difficult to increase to high pressure, and high maintenance costs, to reduce equipment cost investment, avoid excessive pressure, The effect of reducing security risks
Inactive Publication Date: 2015-11-11
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology
However, there are still some problems in the high-pressure jet rock breaking technology. The main reason is that the high-pressure jet has high requirements on the performance of the ground booster pump and the strength of the fluid pipeline, so the equipment cost is high and safety hazards are prone to occur.
Especially for carbon dioxide, due to the large volume of the gas storage tank of the gas tank truck, the allowable pressure is generally 2-3MPa. If it is at room temperature, the carbon dioxide is in a gaseous state. The three-stage booster pump goes through the process of gaseous state to low-pressure liquid state and then to high-pressure liquid state, which makes the ground equipment complicated and the maintenance cost high
The method of cooling the gas storage tank can be used to keep the carbon dioxide in a liquid state, but it will also increase additional refrigeration cycle equipment and maintenance costs
In addition, the above two measures require the ground booster pump to have high pressure resistance
Method used
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Embodiment 1
[0017] The main structure of the carbon dioxide gas drilling device involved in this embodiment includes a gas storage tank 1, a booster pump 2, a drill pipe 3, a hydraulic control chamber 4, a high-pressure inlet 5, a primary booster chamber 6, a hydraulic ventilation valve 7, a low-pressure Outlet 8, piston 9, drill bit 10, nozzle 11, secondary pressurized chamber 12, piston lower pressure chamber 13, piston upper pressure chamber 14, check valve 15, throttle valve 18 and fluid pipeline; The gas tank 1 stores gaseous carbon dioxide and provides fluid circulation power through the booster pump 2. The gas tank 1 and the booster pump 2 constitute the original power system of the device, and are connected to the subsurface device through the drill pipe 3 and the high-pressure inlet 5; the nozzle The bottom end of 11 is connected with a drill bit 10, and the piston 9 at the lower surface is connected to the hydraulic valve 7 through the hydraulic oil in the hydraulic control chamb...
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The invention belongs to the field of oil gas drilling technology, and relates to a carbon dioxide gas drilling apparatus and method. A gas tank and a booster pump form an original power system of the whole apparatus, the original power system is connected with an underground device through a drilling rod and a high-pressure inlet, and the bottom of a nozzle is connected with a drill. An underground piston is connected with a hydraulic scavenging valve in a power mode through hydraulic oil in a hydraulic control chamber. An upper pressure chamber of the piston and a lower pressure chamber of the piston are arranged in the piston. A first grade pressurizing chamber and a second grade pressurizing chamber are respectively arranged in the upper and lower portions of the piston, and connected in series with the high-pressure inlet and the nozzle through a non-return valve and a fluid pipe. A low-pressure outlet is arranged in the bottom of a well and connected with an annulus. The carbon dioxide gas drilling apparatus is simple in structure, reliable in principle, low in economic cost, easy to implement and environmental friendly.
Description
Technical field: [0001] The invention belongs to the technical field of oil and gas drilling, and relates to equipment and technology for converting surface gaseous carbon dioxide into an underground high-pressure supercritical state at the bottom of a well and forming a high-pressure jet of carbon dioxide at the bottom of a well during one construction, in particular to a carbon dioxide gas drilling device and methods. Background technique: [0002] The rock-breaking threshold pressure of high-pressure water jet is low, the rock-breaking efficiency is high, and the threshold pressure is about 60%-70% of mechanical rock-breaking, so it is widely used in drilling and rock-breaking. With the deepening of research, supercritical carbon dioxide is also used as a jet fluid. Foreign experimental studies have proved that the rock breaking speed of supercritical carbon dioxide direct jet is 3.3 times that of water jet. Speed and cost savings are of great significance. However, t...
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IPC IPC(8): E21B7/18
Inventor 倪红坚李木坤王瑞和霍洪俊
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)