反循环钻进（也作“双壁钻进”）是一种勘探钻进方式，可以研究基岩的强度是否能够支撑在其上面的建筑或人们可否在基岩下面挖出矿物。这种钻进方式可以帮助人们快速获取可靠的勘探结果，查明基岩背后隐藏的信息。这种钻进方式同时采用冲击和回转方式。

反循环钻进使用反循环冲击器来作业，配合由内外管组成的双壁钻杆，岩渣通过内管回收到地表。这种方式能采集到理想的岩石碎片，因为大型的空压机能把推进的钻头前面的岩石提取。反循环钻进用在不需要采集岩芯的情况下，用来持续采取地基样本。钻进中能连续不断地收集样本，这其中约12%岩渣可用作研究分析。

反循环钻进比比起取芯钻进来说相当地块，它杜绝了取芯钻进中水对取芯带来的问题，也避免了花时间回拉钻具总成和岩芯到地表，因为反循环钻进的取样过程即便是在疏松断裂岩层下也是即时进行的。反循环钻进作业比金刚石岩芯钻钻进成本低，加之所有钻凿过的岩石都被收集，因此成为质地勘探和调研作业的又一选择。然而，反循环钻进采回的仅仅是岩石碎片，所以能得到的地质信息较岩心带来的少。

反循环钻进有点：

能有效排除大块岩渣，减少其对钻具的磨损的同时进尺也加快

降低气流流入疏松岩层损失，故排渣所需的气耗减少

最终能将岩渣在地表进行处理

能效高、对工地环境的冲击破坏小

傲石捷能提供全套的反循环钻具，包括反循环冲击器、钻头、双壁钻杆等等，其中一些能与其他工厂的产品兼容。

Reverse Circulation Drilling (also referred as dual-wall drilling, and RC Drilling for short) is a method used in investigation and exploration drilling to find out if the bedrock is strong enough to support construction or if people can extract materials from it. It helps to gain fast and reliable results about what is hidden down there in the bedrock. This method makes use of both percussion and rotation movements.

The RC Drilling is done with a RC down-the-hole hammer, uses dual-wall rods with inner and outer tubes, the drill cuttings are returned to surface inside the rods. It ideally produces dry rock chips, as large air compressors dry the rock out ahead of the advancing drill bit. RC Drilling is used to retrieve continuous samples from the ground where a solid core is not needed. Samples are taken continuously during drilling, with around 12% of the cuttings going for analysis.

RC Drilling is considerably faster than core drilling because it eliminates the problems that water can cause with coring and eliminates the time spent recovering core barrel samples to the surface as they are instant even through broken or fractured ground. RC Drilling is cheaper than diamond core drilling and has additional advantage that all the drilled rock is collected making it the most viable option when it comes to mineral exploration and site investigation. However, RC Drilling only produces fragments and chips of broken rock, so there is less geological information available than would be obtained from core. 

Advantages of Reverse Circulation Well Drilling:

Mitigates air loss into sensitive formations

Requires less air to evacuate cuttings

Efficient removal of larger cuttings cause less wear on tooling and faster penetration rates

Ultimate control of cuttings when discharged at surface 

Energy efficient and environmentally less impactful to site

Acedrills offers full range of RC drilling tools, including RC hammers, RC bits, dual-wall drill rods (RC Drill Pipes) and so on, some of which is compatible with most others on the market.