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Dual gradient drilling system and dual gradient drilling method based on coiled tubing electric drive

A tubing and electric technology, applied in underwater drilling, earthmoving, 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: 2019-05-17
SOUTHWEST PETROLEUM UNIV
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  • Claims
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Problems solved by technology

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

Method used

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  • Dual gradient drilling system and dual gradient drilling method based on coiled tubing electric drive

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Embodiment Construction

[0021] Hereinafter, the present invention will be further described with reference to the drawings and specific implementations:

[0022] Such as figure 1 As shown, a dual-gradient drilling system based on coiled tubing electric drive includes a pilot hole drilling system and a hydrate stirring system; the pilot hole 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, adapter 19, connecting casing 9, hollow The electric motor 12, the drill bit 17, and the 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 electric multi-stage centrifugal pump 1 is installed inside the large casing ...

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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 field of natural gas hydrate drilling and subsea shallow oil and gas drilling, in particular to a dual gradient drilling system and method based on coiled tubing electric drive. Background technique [0002] In the 21st century, energy and environment are two major issues that people are paying more and more attention to. As my country's environmental problems become more serious and energy problems are dwindling, reducing energy consumption and reducing pollutant emissions are the top priorities. Submarine shallow oil and gas and natural gas hydrate reserves are abundant, widely distributed, efficient and clean, and have broad prospects for commercial development. Geological survey experts said that China has abundant reserves of natural gas hydrates and shallow submarine oil and gas, which are higher than conventional available resources and have the conditions to become clean energy in the future. Therefore, the ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/12E21B33/064E21B33/13E21B43/01
Inventor 王国荣黎伟刘清友陈曦蒋少玖钟林周守为王川李中李炎军付强刘和兴
Owner SOUTHWEST PETROLEUM UNIV
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