Reverse circulation cluster down-the-hole hammer for hole reaming

Abstract

The invention discloses a reverse circulation cluster type downhole hammer for reaming. The cluster type down hole hammer comprises an upper connector, an inner pipe, an outer pipe, an air distribution chamber, pneumatic down hole hammers, a central pipe and a seal fixed plate, wherein the inner pipe is sleeved by the upper connector and the outer pipe in sequence from top to bottom; the connector is connected with the outer pipe; the central pipe is connected to the lower end of the inner pipe; the upper part of the outer pipe is sleeved by the air distribution chamber; the lower part of the central pipe is sleeved by the seal fixed plate; the plurality of pneumatic down hole hammers are arranged between the air distribution chamber and the seal fixed plate. A reverse circulation channel can be formed in a hole in the ream drilling process of a rock section after the cluster type down hole hammer is connected with a matched dual-wall drill tool system, so that the chip removal by reverse circulation can be realized and then the efficient rock breaking advantages of the pneumatic down hole hammers can be brought into full play.

Description

technical field [0001] The invention belongs to the technical field of drilling equipment, and in particular relates to a reverse circulation cluster type down-the-hole hammer for hole expansion. Background technique [0002] Pneumatic down-the-hole hammer drilling technology has the characteristics of high-efficiency rock breaking, and has been widely used in oil and gas exploration, metal ore exploration, foundation pile foundation drilling and other fields. [0003] The application of pneumatic down-the-hole hammer drilling technology in the field of mine emergency rescue has always been the direction of the industry's efforts, especially in the Chilean copper mine disaster rescue in 2010. After the pilot hole and the underground area where the trapped people were opened, the hole was reamed At that time, a large-diameter cluster DTH hammer was used for reaming drilling. The broken rock debris fell into the roadway along the guide hole, and the trapped personnel cooperate...

AI Technical Summary

Problems solved by technology

[0005] According to public reports, domestic large-diameter reverse circulation down-the-hole hammer products mainly include: single-head large-diameter wet reverse circulation down-the-hole hammer (FGC-15 type, FGC-15B type), large-diameter combined bundled pneumatic down-the-hole hammer (FC -312 type), large-diameter through-type DTH hammer (maximum diameter is Ф660mm), the above-mentioned large-diameter reverse circulation DTH hammers are all full-section DTH hammers, and drilling deviation may occur during construction, while the aforementioned two types of large-diameter The reverse circulation DTH hammer is equipped with a multi-channel flange connection drilling tool, and it takes a long time to connect the drilling tool

Images