System and State Feedback Method for Controlling Electro-hydraulic Orienter in Coiled Tubing Drilling

Abstract

The invention discloses a system and a state feedback method for controlling an electro-hydraulic directional device for coiled tubing drilling, comprising: a magnetic ring at a starting point and a magnetic ring at an ending point installed on the outside of a piston sleeve and on both sides of a solenoid valve; The magnetic sensor in the piston moves with the piston between the magnetic ring at the start point and the magnetic ring at the end point, and induces the magnetic field at the corresponding position to generate a corresponding position induction signal; it is connected with the magnetic sensor and the solenoid valve The closed-loop control module acquires and detects the position sensing signal, judges the piston position, and controls the switching of the solenoid valve state based on the judgment result and the current state of the solenoid valve to determine and feedback the working state of the electro-hydraulic directional device. The invention realizes the intelligent closed-loop control in the process of orienting the orienting device, eliminates the problem of human experience judgment error during the orienting operation of the traditional electro-hydraulic orienting device, and improves the directional efficiency and directional accuracy of coiled tubing drilling.

Description

technical field [0001] The invention relates to the technical field of downhole control of oil and gas wells, in particular to a system and a state feedback method for controlling an electro-hydraulic directional device for coiled tubing drilling. Background technique [0002] During coiled tubing drilling, the coiled tubing and BHA cannot rotate due to the limitation of the coiled tubing delivery device at the wellhead. Therefore, in order to realize coiled tubing directional drilling, a coiled tubing directional tool needs to be connected to the bottom hole assembly. This tool is the core tool of coiled tubing drilling, which determines the technical level of trajectory control during coiled tubing drilling. [0003] At present, the commonly used electro-hydraulic directional device performs directional operation by controlling the state of the downhole solenoid valve through ground commands. The solenoid valve is divided into three states: directional state, return state...

AI Technical Summary

Problems solved by technology

This is prone to the following problems: 1. Due to the large bottom hole friction or the sticking of the BHA, the pressure formed at the piston by the drilling fluid displacement at this time cannot overcome the BHA friction, and the piston rod cannot go down This situation will cause even though the solenoid valve becomes directional, but the actual bottom hole assembly does not rotate, and the wellhead cannot understand this situation, resulting in a misjudgment that it has rotated

2. The holding time of different states of the solenoid valve is set based on experience. It is easy to happen that the holding time of the directional state is too short so that the directional rotation is not complete, or the holding time of the recovery state is too short that the directional device is not fully restored, which will affect the next directional operation. , resulting in cumulative rotation angle deviation, which affects the coiled tubing drilling positioning effect, and keeps the state for too long, wasting precious drilling time

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