Method and device for high-speed wired duplexing information communication between well and ground

Abstract

The invention provides a method and device for high-speed wired duplexing information communication between a well and the ground. The method comprises the steps of: collecting signals in the well by a sensor; modulating the collected signals by adopting a coding orthogonal frequency division multiplexing technology into OFDM (Orthogonal Frequency Division Multiplexing) signals; transmitting the signals to the ground by a basic structure unit consisting of a drill stem with cables and the like and further demodulating to obtain the collected signals in the well, thereby determining the underground temperature, pressure and fluid condition, formulating a drilling well completion strategy and forming a ground control instruction which is transmitted to an appointed position in the well by a transmission system. Compared with traditional like technologies, the system has the advantages of a large amount of transmittance data, high transmission speed, strong real-time property, two-way communication, high confidentiality and the like.

Description

technical field [0001] The patent of the present invention belongs to the field of oil and gas exploitation, and relates to a wired communication method and device for high-speed transmission of drilling information, mud logging information and measurement-while-drilling information to ground terminals, and high-speed transmission of ground control information to wells. Gas drilling is practical. technical background [0002] Drilling and completion engineering is a hidden and complex system engineering that can generate a large amount of information, and informatization is a necessary condition to ensure the safety, high quality and low cost of drilling and completion engineering. Drilling and completion information mainly includes various drilling and mud logging information and measurement-while-drilling information that has developed rapidly in recent years. The collection of these information can realize the comprehensive evaluation and real-time logging operation of t...

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Problems solved by technology

In 1963, A.H.Lord improved Hare’s patent, which reduced the required electric energy but it was difficult to install and unload the induction joint; in the 1970s, the former Soviet Union developed the wired transmission system STE, which realized the real-time data transmission of the continuous measurement of geometrically oriented LWD parameters , using the method of directly suspending cables in each single drill pipe and adding power plugs at the joints, the reliability is good in the initial use, but after drilling several times, due to the aging of the wires and frequent interruptions, the failure rate is greatly increased on average. 1 time per kilometer)

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