A Decoding Method of Downstream Commands in Rotary Steerable Drilling System

Abstract

The invention discloses a downlink instruction decoding method of a rotary steerable drilling system. The method is as follows: 1) The rotary steerable system converts the downlink command into mud flow information and sends it to the downhole control system; 2) The downhole control system collects the mud flow information in real time, and filters the flow data collected within a certain period of time, If the peak value of the data reaches the set value H, it is determined that there is command information to start downloading, and proceed to step 3); otherwise, there is no command information to be downloaded; 3) Collect mud flow information in real time to obtain pulse information for download; 4) Calculate each The gradient value of the pulse information, if the signal gradient change exceeds the set value h1 and is positive, it is determined that the rising edge of the pulse occurs; if the signal gradient change exceeds the set value h2 and is negative, it is determined that the pulse falling edge occurs; 5) According to the determination The pulse signal information sent out can be used to obtain the instruction information sent down. The invention can determine and identify whether there is a downlink instruction and the mud pulse position.

Description

technical field [0001] The invention relates to the field of oil exploration and development, in particular to a method for receiving and decoding ground commands by an underground system when ground commands are transmitted down. Background technique [0002] In oil drilling operations, the rotary steerable drilling system that can realize closed-loop control of the drilling process has been gradually applied in oil exploration and development operations. At present, in the field of rotary steerable drilling, most of the key technologies are in the hands of several foreign oil and gas development service companies, and domestic companies are in the early stages of development in this field. With the rapid development of my country's national economy, the demand for exploration and development of oil resources is becoming increasingly urgent, and the requirements for efficient oil drilling systems are getting higher and higher. Therefore, developing one's own mature rotary ...

AI Technical Summary

Problems solved by technology

The command encoding and decoding method of this method is relatively complicated, and because the downhole environment is very complex, there are various high-intensity vibrations, shocks, electromagnetic interference and other interference factors, the reception and correct identification of the mud pulse signal transmitted by the downhole system will be affected to varying degrees. impact, and even cause information download failure

Images