Device and method for inhibiting generation of hydrates in shaft through automatic early warning and heating

Abstract

The invention discloses a device and a method for inhibiting generation of hydrates in a shaft through automatic early warning and heating, and belongs to the technical field of natural gas hydrate exploitation. Resistance wire windings formed by tightly and spirally winding resistance wires are arranged on the outer surface of an oil pipe at preset intervals in the axial direction; two ends of the resistance wires are respectively welded on two conductive metal sheets; a temperature and pressure sensor is arranged between any two adjacent resistance wire windings; two sliding grooves servingas electrode moving channels are symmetrically formed in the inner side wall of a marine riser in the axial direction of the marine riser; clamping grooves are formed in the sliding grooves; electrodes are in contact connection with the conductive metal sheets at the clamping grooves; the input end of a first cable is connected with a motor; and the output end of the first cable is connected withthe two electrodes. Local heating can be carried out on a specific time in a specific area to avoid generation of natural gas hydrates, and compared with a traditional method, the method is more energy-saving, safer and more environmentally friendly. A heating device is generally in a turnoff state, and long-term effective operation of a system can be guaranteed.

Description

technical field [0001] The invention relates to the technical field of natural gas hydrate exploitation, in particular to a device and method for automatic warning and heating to suppress the formation of wellbore hydrate. Background technique [0002] Gas hydrate is an ice-like crystalline compound with a cage structure formed by natural gas and water under low temperature and high pressure conditions. It mainly occurs in terrestrial permafrost regions and marine sediments. Natural gas hydrate has huge reserves and is considered to be an ideal alternative energy source in the 21st century. [0003] On March 26, 2020, the second round of trial production of natural gas hydrates in my country's sea areas produced a total of 861,400 cubic meters of gas, with an average daily gas production of 28,700 cubic meters, creating two new records of "total gas production and average daily gas production". The world record has laid a solid foundation for the commercial exploitation of n...

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Problems solved by technology

[0008] The purpose of the present invention is to solve the problem of the secondary formation of natural gas hydrate in the wellbore in the low temperature environment in the process of natural gas hydrate exploitation in sea areas, and propose a device and method for automatic early warning and heating to suppress the formation of wellbore hydrate, which can effectively prevent Secondary gas hydrate formation

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