长城钻探随钻仪器介绍.pptx

Greatwall DrillingMWD/LWD Tools ;;Downhole Tools Layout;GW-Logging While Drilling System (BWR) ;GW-LWD(Logging While Drilling) system can provide well trajectory parameters, two resistivity curves and one gamma ray curve in real time, and provide eight memory resistivity curves of different investigation depth. The LWD tool can accurately detect the oil?pool and help control the trajectory goes inside the reservoir at the utmost. This significantly increases success ratio of drilling. It is widely used in geo-steering and formation evaluation of horizontal well and extended reach well. The GWDC has 3 sizes GW-LWD include 8”,6 ?”, 4 ?”.;Conventional resistivity （no direction determination）;7;;Shale roof and floor detection – Well Du81X;;;GW-Near Bit Geosteering System (NB);Near Bit Gamma-Ray Curves ;;The bit is steered by applying a side load to the formation that forces the bit in the direction of the desired curve. Pads or “kickers” are used to push against the formation to change the bit direction. ;Pros: Mechanical design is more straightforward. Applying a force to the borehole wall is often less difficult than deflecting a driveshaft. Cons: Bit required to be more laterally aggressive, can be less stable and more susceptible to vibration. More reliant on formation to build angle. ;GW-Point the Bit Rotary Steering Drilling System;GW-Point the Bit Rotary Steering Drilling System; Steering Unit — Deliver lateral force to bit by rotation of electromagnet, rotation direction of electromagnet is different from that of drilling pipe but they have the same action in order to make force direction relative to borehole. Bit Shaft — 360 degree of action to transmit torque and bit pressure. Pressure Compensation System — Consist of metal bellows and pressure firm to balance pressure from internal oil and external mud.;Hydrolic Vibration Drilling System; From17 Feb. to 31 Mar. in 2016, HPG+DTV was first time to use in Shen268-H307 with BRT 544h, pumping hour 382h