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  2. Underground pneumatic boring - Wikipedia

    en.wikipedia.org/wiki/Underground_pneumatic_boring

    The valve reopens, and the cycle repeats. The friction between the tool and the earth keeps the tool from sliding back. Tool speed is controlled by manipulating the air supply to the tool. This air supply valve is outside the tool and remains accessible to the operator. As the tool pounds through the ground, it compresses the soil.

  3. Rotary steerable system - Wikipedia

    en.wikipedia.org/wiki/Rotary_steerable_system

    The methods used to direct the well path fall into two broad categories, these being “push-the-bit” or “point-the-bit”. Push-the-bit tools use pads on the outside of the tool which press against the well bore thereby causing the bit to press on the opposite side causing a direction change.

  4. Hole opener - Wikipedia

    en.wikipedia.org/wiki/Hole_opener

    Heavy-duty roller cones hole opener used for offshore drilling. A hole opener is a device used to enlarge the borehole during a well drilling operation. It can be positioned either above the drill bit or above a pilot run inside the existing borehole. Usages range from hydrocarbon drilling operations to water drilling or horizontal drilling.

  5. Well drilling - Wikipedia

    en.wikipedia.org/wiki/Well_drilling

    The earliest record of well drilling dates from 347 AD in China. [1] Petroleum was used in ancient China for "lighting, as a lubricant for cart axles and the bearings of water-powered drop hammers, as a source of carbon for inksticks, and as a medical remedy for sores on humans and mange in animals."

  6. List of abbreviations in oil and gas exploration and production

    en.wikipedia.org/wiki/List_of_abbreviations_in...

    BPV – back pressure valve (goes on the end of coiled tubing a drill pipe tool strings to prevent fluid flow in the wrong direction) BQL – B/QL log; BRPLG – bridge plug log; BRT – below rotary table (used as a datum for depths in a well) BS – bend stiffener; BS – bumper sub; BS – booster station

  7. Formation evaluation - Wikipedia

    en.wikipedia.org/wiki/Formation_evaluation

    Mud logging (or Wellsite Geology) is a well logging process in which drilling mud and drill bit cuttings from the formation are evaluated during drilling and their properties recorded on a strip chart as a visual analytical tool and stratigraphic cross sectional representation of the well.

  8. Deviation survey - Wikipedia

    en.wikipedia.org/wiki/Deviation_survey

    In the oil industry, a deviation survey, [1] or simply a survey, is the measurement of a borehole's departure from the vertical, expressed in degrees (°).. When a well plan dictates the drilling of a straight borehole, surveys are periodically taken to ensure that it will hit its target and also to ensure that it does not trespass underneath different property lines.

  9. Bottom hole assembly - Wikipedia

    en.wikipedia.org/wiki/Bottom_hole_assembly

    A stabiliser is used within a column of drill collars. They help guide the bit in the hole. They play a major part in directional drilling as it helps determine the well-bore path and angle. It is used to equalize the load on the bit; prevent whirl of the lower assembly; minimize bit walk; minimize bending and vibrations that cause tool joint wear;

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