Causes Of Top Hammer Drilling Tools Broken

Abstract:  The main reasons for the breakage of top hammer drilling tools are mainly due to the diamond drill tool itself, techni...

  The main reasons for the breakage of top hammer drilling tools are mainly due to the diamond drill tool itself, technical reasons, and geological reasons.

  1. The drill tool itself causes the diamond drill bit to break

  There are many domestic manufacturers of diamond drill bits and drilling tools, and their production levels are uneven, and the quality must be different. The maintenance of the drilling tools by the drilling operation personnel is also the key to affecting the service life of the drilling tools. Therefore, the reasons for the broken tools are summarized. Have:

  (1) Drilling tools such as core pipes and drill pipes are not straight, resulting in a large increase in torque in a square hole;

  (2) There are quality problems in the material of the drilling tool, especially the unevenness of the overall rigidity and toughness of the drilling tool caused by the presence of insoluble impurities and uneven components in the material; the drilling specification parameters are not appropriate such as excessive pressure and excessive drilling speed;

  (3) Serious abrasion or defects such as cracks, inadequate maintenance after use, and lax inspection in the next use, so that the problem drill tool is lowered into the hole;

  (4) The technical condition of the equipment used is not good, such as poor stability of the drilling rig, gaps in the gyrator bearings, etc.; insufficient power of the power machine, unstable operation when overloaded; uneven water delivery and pressure of the reciprocating water pump, and pulsation of the flushing fluid.

  2. The diamond drill bit is broken due to technical reasons

  A good horse with a good saddle, even the best drilling equipment, and drilling tools, if the drilling operation technology is not too hard, it is difficult to achieve the ideal drilling efficiency and the drilling tool is prone to breakage. The main reasons for the drilling tool to break due to the operation are:

  (1) The strength of the foundation of the drilling rig is insufficient and the installation of the drilling rig on the foundation is not firm;

  (2) The drilling structure design is unreasonable, and the diameter and hole diameter of the drill pipe and core tube is unreasonably matched;

  (3) Large diameter drilling tools without stable joints; use curved drill pipes and core pipes; use blunt or normally worn drill bits (diamond chipping, eccentric wear of the lip, oval wear of the drill bit, etc.);

  (4) The choice of drilling procedure parameters is not suitable for the nature of the drilled rock; blindly pressurize and increase the drilling speed;

  (5) Drill pipe lock joints are not concentric; due to manufacturing reasons or uneven wear during use (especially used in curved drilling), uneven wall thickness and ellipticity cause the drill pipe to be non-concentric, Unbalanced rotation;

  (6) The active drill pipe is bent, super long, and eccentric in the vertical shaft;

  (7) The borehole is bent;

  (8) Use heavy water-lifting joints and water delivery pipes;

  (9) There are residual cores or other metal objects at the bottom of the hole;

  (10) The inside of the hole is clean; there is a serious over-diameter hole section in the hole or there is a hanging block when drilling, sudden sticking, clamping, burning, etc.

  3. Geological reasons cause the diamond drill bit to break

  The rock formations drilled by diamond bits are often non-single, broken, and other complex formations. These external objective conditions have a great impact on the stability of diamond bits and tools, which can easily cause the drilling tools to break, which is easy to cause. The main formations are:

  (1) The rock layer is broken and cracks are developed;

  (2) The soft and hard rock formation changes frequently;

  (3) Stratum bedding, schistosity developed and formed an acute angle on the borehole axis;

  (4) Karst cave, hollow development;

  (5) The granularity of the rock formation is uneven and has a heterogeneous structure;

  (6) Uneven hardness and strength of rock.