Onsite Engineer Support (Vertical Drilling)

Highly skilled engineers on Customers' well site help increase the effectiveness oil and gas wells construction. Qualification of our engineering staff in combination with a wide range of downhole tools selection for various downhole conditions and available technical support of our Technical Department, is the key to increased ROP, reduction of tool tripping operations. This in turn allows our Customers to comply with drilling plan more thoroughly while shortening the time of project completion and get to production stage.

Vertical drilling, also known as performance drilling, aims at maximizing ROP and minimising number of drill bits and tool tripping operations. The Wenzel M6 Millenium Motor was developed specifically to handle the rigors of being used with the latest developments in ultra-high torque power sections. Downhole motors are available in various sizes from 241 mm to 79 mm. Separate on and off bottom thrust bearings allow for high allowable weight on bit and back reaming loads. The M6 was designed specifically for Directional, Horizontal and Straight Hole drilling applications.

Directional and Horizontal Drilling

UNGS provides directional drilling services using positive pulse MWD system by Bench Tree, Georgetown, Texas. The system includes Gamma sensor. Application of downhole motors in combination with MWD systems allows for quick reach of well target of reservoir.

 Directional drilling is required when:

    Oil and gas deposits are located under living areas, under water reservoirs, farm lands, that make access to them difficult or impossible;

    Inclination of the end section coincides with the fault line of the reservoir (in this case a significant portion of the well passes through the productive reservoir);

    Cluster drilling, which groups wellheads in a small area and allows for drilling using one rig with its slight movement, is necessary;

    Multilateral drilling, which involves the passing of the mother wellbore followed by drilling and passing of extra wellbores to the reservoir in the bottom of the mother bore, is necessary;

    Killed wells for prevention of accidents are created (for example, to stop well flowing).

For directional drilling, UNGS Service Department has a wide range of modular power sections with different rotation speeds and torque characteristics for each individual project and a drilling bit type:

    High-speed downhole motors for drilling hard rocks and for use with impregnated bits.

    Low-speed motors for drilling soft rocks and for use with roller cone drill bits that provide the torque at reduced rotation speed and loads on bearings of the bits for increased bit life.

     Low- and medium-speed motors for use with polycrystalline diamond compacts (PDC) bits and with a relatively high torque for maximum penetration rate and for increased bit life. 

For directional and horizontal drilling operations, UNGS specialists use Bench Tree M/LWD technology in combination with properly selected Wenzel downhole motors and jars. Our downhole motor fleet features special motors with a shorter bearing section (HB-21). The peculiarity of this tool is the distance from the end of the output mandrel to the bent sub, which is only 800 mm, whereas M6 Millenium standard bearing assemblies have a length of 1,725 mm. This permits to almost double the intensity of angle build-up and to reduce the number of RIH/POOH operations to change the steering angle and permits the simultaneous increase of the rotational speed of the rotor with no risk of damage to the downhole motor. 

 Learn more about tools used by UNGS.