The paper mainly introduced the application effect and experience of lengthening coring barrel of SYZX75 wire-line coring hydro-hammer in fractured rock layer.

SYZX75 wire-line coring hydro-hammer was introduced in compact,low abrasive hard rock bed with small particle,core blockage in broken formation and drilling difficulties in hard compact "skid" formation were overcome with high drilling efficiency and good-quality borehole.

Working principle and structural features of SYZX75 wire-line coring hydro-hammer are presented.

7 mm wire-line coring tool driven by a mud motor.

To meet the demand of wire-line coring drilling in complicated formation,compound solid-free drilling fluid of CL plant glue was compounded and used instead of drilling mud with the property of wall protection and leaking stoppage.

The application instance of wireline coring technique was introduced with the project case of coal-bed methane parameter well in Baotian-Qingshan area of Guizhou,the drilling techniques were brought forward in accordance with complex formation,unstable borehole wall,being hard to core in coal powder.

The wireline coring technique is an advanced, multi-functional drilling method.

It combines the RC drilling with the diamond wireline coring drilling and uses the same drilling pipes and tools to realize several drilling methods adapted to its formations according to the engineering environments and geological requirements and so on.

The problems occuring in small diameter wire line coring drilling, such as slurry cake in inner face of drilling rod, low carrying capability, high water loss and so on, can be solved with it.

Based on the wire line coring,hydro-hammer,PDM drilling technology,"There into One" drilling tool was developed.

Summarized the ZQ1 testing CBM well revealed stratigraphic and geologic profiles,drilling equipment needed,well structure and quality requirements,each sector operational and wire line coring drilling tool combinations,drilling parameters.