What is a lead tube?

A conductive tube can be run into a hole drilled by a twist drill and then cemented in place.

A conduit pipe is a relatively short, large-diameter pipe that is driven into the ground before drilling holes or oil wells. Also known as a transmission tube, this section of tubing serves to support the initial sedimentary part of the well, preventing the looser surface layer from giving way and obstructing the wellbore. The tube also serves a number of other purposes, such as protection from sands carrying water and the return of cuttings from the drill head. A conductive tube is most commonly used in this role in onshore wells, although it is often employed for similar reasons when sinking offshore wells. Conductive pipes are usually installed using drilling, pile driving, or a combination of these techniques.

Stacking helps create a deep foundation for large structures.

The surface section of any well or well is particularly prone to cave-in faults, as the initial strata through which the well passes are typically composed of unconsolidated sedimentary material. The collapse of the upper section of the well not only causes long periods of downtime, but also poses a significant safety risk. To prevent this unstable layer from collapsing, a short, large-diameter conductive pipe is driven through the sedimentary layer to support the wellbore during drilling. These tubes are used in both onshore and offshore wells, with onshore projects being the most common application. In the case of subsea wells, the conductor tube can also be used as a base for the wellhead.

Installing a conduit pipe also serves several other secondary purposes in addition to supporting the well. It serves to isolate freshwater zones from the ingress of drilling fluids and wells. The debris and cuttings suspended in the drilling mud are also removed through the conductive tube, while the tube provides protection and support for the surface casing, which is the next series of outer tubes in the well structure. In addition to these benefits, the pipe also prevents leakage of loose material below the drilling rig during sinking operations.

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In most cases, the lead pipe is installed in one of three ways. The pipe can be run into a hole drilled by a twist drill and then cemented in place, or the second method is pile driving, which sees the pipe driven into the ground by repetitive blows from a known heavy pneumatic or diesel hammer. as a pile driver. The third method is a combination of the two previous procedures and is used when pile driving fails to drive the conduit to the correct depth. In this case, the tube is introduced to the point where it refuses to proceed, the hole is then enlarged a short distance with the perforation, and the tube is introduced again until it refuses. This process is repeated until the tube reaches the correct depth.

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