Energy accumulation type hydraulic hole drilling hammer

Abstract

The invention relates to an energy accumulation type hydraulic hole drilling hammer which has large impact power and high energy utilization rate, is suitable for drilling deep wells with slurry, is mainly applied to engineering, such as petroleum drilling, water well drilling, core drilling, foundation pile hole drilling and other projects, and is a rock breaking tool enhancing the drilling efficiency and quality greatly and lowering the drilling cost. The energy accumulation type hydraulic hole drilling hammer comprises an upper joint, a casing, a beakiron and a valve control hammer strike mechanism which is arranged in the casing and has the functions of valve control, hammer raise, energy accumulation and hammer strike. Hydraulic surface force pushes a piston to apply work so as to utilize liquid energy with high efficiency, and a hammer spring can obtain the design energy of hammer strike just by smaller pressure intensity and flow rate; the line of liquid flow is simple, the section of a passage is large, and drilling liquid discharged into a lower cavity at the time of hammer strike can quickly flow to an upper cavity in a negative-pressure state by little energy consumption; and the processes of hammer raise, energy accumulation and liquid discharge to the bottom of a well are all completed in the return stroke, and the instantaneous flow rate discharged to the bottom of the well at the time of stroke is nearly zero, therefore, the drilling liquid only applies work at the time of hammer raise after entering the hole drilling hammer, and the instantaneous energy consumption of hammer strike is very little.

Description

technical field

[0001] The invention relates to a rock breaking tool used in oil drilling, water well drilling, core drilling, foundation pile hole drilling and other projects, in particular to an energy storage type hydraulic down-the-hole hammer. Background technique

[0002] There are three main types of existing hydraulic down-the-hole hammers: positive action, double action and reverse action, and compound action down-the-hole hammers derived from them. Among the above three types of down-the-hole hammers, the positive action and double action hammers are simple in structure, stable in performance, and have good back pressure resistance characteristics, and have been widely used. There are serious defects such as low energy utilization rate and small impact energy to varying degrees. The main feature of the reaction hydraulic down-the-hole hammer is that the energy required for the stroke is stored in the accumulator by using the hydraulic energy of the return stroke o...

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