W.hat is IR mitigation and what does it entail?

W.hen drilling HDD bores, the measured depth is typically shallow at around 120 feet. A 3,500-foot underground crossing may pass under a river, road, sharp freeway or a sensitive area, and sometimes with certain soil types, the soil will break through to the surface: this is known as an inadvertent return, or IR.

泥工工程师有助于纠正这些类型的遗失问题。在某些情况下，泥浆可能会突破井筒的骨折一直到表面。工程师不仅为井筒施用液体，而且还负责固定IRS。

W.hen engineers realize that they're losing returns, they must determine if it's coming up through the ground or if it's due to a fracture underneath. In a typical application, engineers spot a pill and squeeze it with lost circulation material that consists of an environmentally safe sealant that has expandable material that is designed to correct IRs. The sealant consists of natural plant fibers. They’re compressible particles that can form to the pores and fractures to provide a bridge to seal to prevent any further loss of drilling mud.

这是通过将枪管（约25桶）送到钻杆，将其追逐并探测丸来完成。通过备份管道，可以在药丸的顶部（在设定药丸的顶部约40或50英尺）然后挤压形成。挤压的目的是密封这些骨折和微骨折。

该过程通常在IR的开始处完成，挤压持续几个小时。另一种挤压将遵循以防止任何进一步的美国国税局。