A Dual Gradient Drilling System Based on Coiled Tubing Electric Drive
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An electric-driven, dual-gradient technology, applied in underwater drilling, earth-moving drilling, wellbore/well components, etc., can solve the problems of high cost of natural gas hydrate development, and achieve the effect of sustainable development and utilization and low construction risk.
Active Publication Date: 2020-11-24
SOUTHWEST PETROLEUM UNIV
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Based on the above analysis, the development cost of gas hydrate is high, so it is urgent for us to develop an effective technology for mining gas hydrate to reduce the development cost of gas hydrate
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[0022] Below, in conjunction with accompanying drawing and specific embodiment, the present invention is described further:
[0023] Such as figure 1 As shown, a dual-gradient drilling system based on coiled tubing electric drive includes a pilot drilling system and a hydrate stirring system; the pilot drilling system and hydrate stirring system include: coiled tubing 22, variable diameter Connector 3, cable 21, hollow electric multistage centrifugal pump 1, double-layer drill pipe 20, simple wellhead 6, casing blowout preventer 7, lift pump 8, outer casing 4, conversion joint 19, connecting casing 9, hollow Motor 12, drill bit 17, drill bit water eye 18; the coiled tubing 22 pulls the cable 21, and the cable 21 is connected to the hollow electric multistage centrifugal pump 1, thereby controlling the working power of the hollow electric multistage centrifugal pump 1; the hollow electric multistage centrifugal pump 1 is controlled; The electric multistage centrifugal pump 1 i...
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Abstract
The invention relates to a dual gradient drilling system and a dual gradient drilling method based on coiled tubing electric drive and belongs to the technical field of natural gas hydrate and seafloor surface oil and gas drilling equipment. A dual gradient drilling downhole blow-out preventer system comprises a pilot hole drilling system and a hydrate stirring and absorbing system, wherein the pilot hole drilling system comprises a coiled tubing, a cable, a hollow electric multistage centrifugal pump, a reducer union, a dual-layer drill rod, an outer casing pipe, a simple wellhead, a casing pipe blowout preventer, a lift pump, an adapter, a connecting sleeve, a hollow motor, a drill bit and a drill bit port; the hydrate stirring and absorbing system comprises the coiled tubing, the cable,the hollow electric multistage centrifugal pump, the reducer union, the dual-layer drill rod, the outer casing pipe, the simple wellhead, the casing pipe blowout preventer, the lift pump, the adapter, the connecting sleeve, the hollow motor, the drill bit and the drill bit port. The dual gradient drilling system and the dual gradient drilling method disclosed by the invention can be used for effectively exploiting marine gas hydrates, improve the exploiting rate and are process equipment and a process method with higher reliability.
Description
technical field [0001] The invention relates to the technical fields of natural gas hydrate drilling and subsea shallow oil and gas drilling, in particular to a dual-gradient drilling system based on coiled tubing electric drive. Background technique [0002] In the 21st century, energy and the environment are two major issues that people are paying more and more attention to. With the increasingly serious environmental problems and the depletion of energy problems in our country, reducing energy consumption and reducing pollutant emissions is the top priority. Submarine shallow oil and gas and gas hydrate reserves are abundant, widely distributed, efficient and clean, and have broad prospects for commercial development. Geological survey experts said that China's natural gas hydrate and shallow seabed oil and gas reserves are abundant, higher than conventional available resources, and have the conditions to become clean energy in the future. Therefore, the exploitation of ...
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Application Information
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