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Slurry negative pulse data download coding method for well drilling

An encoding method and negative pulse technology, applied in construction and other directions, can solve the problems of not conforming to the actual situation of drilling, low transmission rate, increased drilling time and economic burden, etc., saving data download time, high encoding utilization rate, and improving parameters The effect of downlink efficiency

Inactive Publication Date: 2014-03-26
BEIJING RES INST OF PRECISE MECHATRONICS CONTROLS +1
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Problems solved by technology

At present, the negative pulse of mud is generally used for data downloading at the drilling site, and the transmission rate of negative mud pulse data is low. However, the rotary steerable system needs to transmit relatively many types of data, and the amount of data is relatively large. For example, wells that need to be downloaded The inclination information ranges from 0° to 180°, and the resolution of the rotary steerable tool can reach 0.1°. If you download the absolute value of the inclination information, you need to encode and reserve 1800 data representation capabilities; The actual situation of drilling, increasing drilling time and economic burden

Method used

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  • Slurry negative pulse data download coding method for well drilling
  • Slurry negative pulse data download coding method for well drilling

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Embodiment Construction

[0012] The present invention is described in detail below in conjunction with accompanying drawing and embodiment:

[0013] The encoding method is composed of an encoding method and a decoding method. The encoding method encodes the instructions and parameters that need to be downloaded, specifies the meaning of each data bit, classifies the instructions that need to be downloaded, determines the type of instruction and the size of the parameters attached to each instruction, and encodes data according to the type and data size. For parameters with a wide value range, make full use of the existing information of the downhole equipment, and use the method of maintaining and fine-tuning to change the downhole equipment parameters; clarify the meaning of each data bit, and arrange the parameters in a certain order; the decoding method includes parameter collection, Judging and analyzing the instructions and parameters, the downhole equipment will measure and record the parameter ...

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Abstract

The invention belongs to a slurry negative pulse data download coding method for well drilling. Ground analyzing is conducted on a working mode and an underground parameter of an MWD, wherein the working mode and the underground parameter are uploaded through a slurry pulse, the working mode is adjusted according to the design requirement to generate a set of data codes; a slurry negative pulse is downloaded to download the generated data codes to the underground, the slurry negative pulse is downloaded in a three-down three-up mode, five pulse periods are produced by the three-down three-up mode, data are downloaded to an underground device by utilizing the influence of slurry discharging amount on the parameter of the underground device in each period, the underground device acquires and decodes the influenced parameter, and data information is extracted and is used for device control; the underground device sends parameter information and the control state of itself to an MWD4, and the MWD4 uploads the data by controlling the slurry pulse and sends drilling information to the ground. Data download time is saved, and parameter download efficiency is improved, so that the slurry negative pulse data download coding method for well drilling has important significance for improving quality of a drilling track.

Description

technical field [0001] The invention belongs to a down-transmission coding method of mud negative pulse data for drilling, in particular to a down-transmission coding method of mud negative pulse data for rotary steering. Background technique [0002] When the rotary steerable equipment used in oil drilling works downhole, it is necessary to adjust the working status and parameters of the tool according to the ground instructions. At present, the negative pulse of mud is generally used for data downloading at the drilling site, and the transmission rate of negative mud pulse data is low. However, the rotary steerable system needs to transmit relatively many types of data, and the amount of data is relatively large. For example, wells that need to be downloaded The inclination information ranges from 0° to 180°, and the resolution of the rotary steerable tool can reach 0.1°. If you download the absolute value of the inclination information, you need to encode and reserve 1800...

Claims

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Application Information

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IPC IPC(8): E21B47/22
Inventor 吴文晋白玉新梁军张建国李雪李广庆解庆
Owner BEIJING RES INST OF PRECISE MECHATRONICS CONTROLS
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