HORIZONTAL DIRECTIONAL DRILLING DIAGRAM SOFTWARE

Currently, there is no available instrument for the length detection of horizontal drilling, especially in deep strata. In accordance with the aforementioned points, most existing multi-parameter detectors are used for vertical wells, whereas the patented drilling-length detector for measuring the hydraulic oil flow is only applicable under strictly ideal conditions. Many factors including illumination changes, target occlusion, shadow interference, etc., will affect the images quality, thus possibly leading to miscounting the number of drill stems. The accuracy of measurement results relies on the images quality. To facilitate the images processing and analysis, the monitor video must be recorded in strict environment, which is difficult to be achieved in the site. The number of drill stems is counted by technology of machine vision. A method for counting drill stems with monitor video of drill rig was proposed in 2015. The signal is not stable and reliable with a long drill string. A low-voltage pulse is applied to the drill stem with cable, to measure the length of drill string by detecting the travel time of pulse signal in cable, but the signal attenuation is serious owing to the mud in drill stems. Furthermore, due to serious signal attenuation of sonic wave in the drill strings, the drilling length to be measured is limited to a few dozens of meters. To avoid the disturbance from the vibration of the drill strings while drilling, the drill rig has to stop working so that the detector can receive the sonic signal from knocking on the drill strings. The most popular method is to apply stress wave or sonic wave to determine the drilling length by detecting the wave travel time and phase feature in the drill string. More recently, there have been researches about the measurement methods. The measurement of drilling length has received attention in recent years. A combined test demonstrated the feasibility of the entire drilling-length detection system.

HORIZONTAL DIRECTIONAL DRILLING DIAGRAM SOFTWARE

The host-computer software processes, displays, and saves the drilling-length data, whereas the slave microprocessor software operates the hardware system. The software subsystem is composed of a visual software running on the host computer and a software running in the slave microprocessor. Their responses are used to judge whether the drill-stem joint is passing through the clamping unit then, the order of their responses is used to judge the movement direction. A current coil is installed in front of the clamping unit, and two magneto resistive sensors are installed on the sides of the coil symmetrically and perpendicular to the direction of movement of the drill pipe. The hardware subsystem employs a single-chip microprocessor as the main controller. The detection system consists of a hardware subsystem and a software subsystem. The basic principle is to detect the change in the magnetic-field strength near a current coil while the drill stem and drill-stem joint successively pass through the current coil forward or backward. Herein, a technique for real-time HDD length detection and a management system based on the electromagnetic detection method with a microprocessor and two magnetoresistive sensors employing the software LabVIEW are proposed. The drilling length is an important parameter in the process of horizontal directional drilling (HDD) exploration and recovery, but there has been a lack of accurate, automatically obtained statistics regarding this parameter.

Horizontal directional drilling diagram