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The rocks making up the well bore hole differ in composition and have different properties, depending on which the rocks can be destructed by cutting, spalling, abrasion or crushing. The character of fracture depends on the hardness and ductility of rock. Hence, drilling of wells is performed by using the certain type of tools. The main tool for mechanical destruction of rock to drill a well is a bit. Different types and kinds of bits are applied currently in practice. The degree of wear and criteria of repairability of drill bits with diamond-hard-alloy cutters were studied. Statistical data on service life of different types of diamond drill bits were analysed. The conclusions are: (1) Tables of the peculiarities of wear of bits and defects in diamond-hard alloy cutters (DHACs) and hard-alloy inserts were complied according to the IADC (International Association of Drilling Contractors) classification. (2) Criteria of repairability were determined for the three types of worn-out bits: steel welded bit (Ukraine), bit with an all-milled steel body (Russia), and bit with a die hard-alloy body (USA). (3) The main types of wear of polycrystalline diamond cutter (PCDC) bits in fields are as follows: wear of cutters (17 %), break of cutters (30 %), spalling of cutters (31 %), fallout of cutters (3 %), and absence of wear (19 %).