The guiding problem of hard soil layer, sand and pebble layer will be encountered in horizontal directional drilling construction.

Classification:

Company News

Release time:

2021-06-25

【Summary Description】 The skill of starting operation, when the pilot drill bit passes through the sand, pebble layer and hard layer, when it wants to change the track direction, if it wants to push in blindly, it will cause the drill pipe to bend and the outlet of the horizontal directional pilot drill bit to be blocked. According to the working experience, the operation method of side pushing in with rotation should be adopted, for example, the direction should be upward, then the operator should control the feeding force when the drill pipe is about to bend.

水平定向

1.Horizontal orientationThe choice of guide bit, before choosing the guide bit, must first understand the geological conditions of the surrounding strata, many construction units for small directional drilling construction before laying pipe, do not take geological drilling, only through the long-term accumulation of some data in this area as a reference.

When it is known that this section is mainly soft stratum, the pilot bit with large guide plate surface is used to control the navigation direction as soon as possible. When it is known that the construction section is mainly sand, pebble and hard stratum, the pilot bit with duckbill type and small plate surface area should be used and welded with a certain number of alloy pieces, and the welding edge angle should not be too long to protect the wear of the navigation bit, make it pass through hard stratum, sand and pebble layer smoothly.

2.The skill of starting up operation, when the pilot drill bit passes through sand, pebble layer and hard layer, and wants to change the trajectory direction, if it wants to push in blindly, the drill pipe will bend,Horizontal orientationIn case of blockage of the outlet of the pilot bit, according to work experience, the operation method of side jacking and belt rotation should be adopted. For example, if you want to turn the direction upward, the operator should control the jacking forcedrill pipeWhen about to bend.

The other hand controls the rotary handle to make the orientation of the pilot bit11―1Between directions, make the pilot bit rotate left and right in this interval to make it drill slowly but the effect is very good. This method must pay attention to the preparation of mud, especially sand and pebbles are difficult to form holes. Large weight mud should be configured to protect the hole wall, and the hole wall of hard soil layer should be connectedHorizontal orientationThe gap between the outer diameter of the pilot bit is small, and the rock shall be discharged out of the hole in time to prevent the pilot bit and drill pipe from locking up.

Key words:

weilida drill