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  2. List of free geology software - Wikipedia

    en.wikipedia.org/wiki/List_of_free_geology_software

    Free to use software to digitize geological cross-sections, and display and edit borehole logs Geoscience ANALYST [ 30 ] Free 3D visualization and communication software for integrated, multi-disciplinary geoscience and mining data and models, which also connects to Python through geoh5py, its open-source API

  3. Measurement while drilling - Wikipedia

    en.wikipedia.org/wiki/Measurement_while_drilling

    A drilling rig is used to create a borehole or well (also called a wellbore) in the earth's sub-surface, for example in order to extract natural resources such as gas or oil. During such drilling, data is acquired from the drilling rig sensors for a range of purposes such as: decision-support to monitor and manage the smooth operation of ...

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

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

    SPUD – spud date (started drilling well) SPWLA – Society of Petrophysicists and Well Log Analysts [29] SQL – seismic quicklook log; SQZ – squeeze job; SR – shear rate; SRD – seismic reference datum, an imaginary horizontal surface at which TWT [clarification needed] is assumed to be zero [citation needed] SREC – seismic record log

  5. API well number - Wikipedia

    en.wikipedia.org/wiki/API_well_number

    An API well number can have up to 14 digits divided by dashes as follows: Example: 42-501-20130-03-00 [7] The "42" means that this well is located in "State Code" 42 which is Texas. The "501" means that this well is located in "County Code" 501 which is Yoakum County. The "20130" is a "Unique Well Identifier" within the county.

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  9. Core recovery parameters - Wikipedia

    en.wikipedia.org/wiki/Core_recovery_parameters

    Rock-quality designation (RQD) is a rough measure of the degree of jointing or fracture in a rock mass, measured as a percentage of the drill core in lengths of 10 cm or more. High-quality rock has an RQD of more than 75%, low quality of less than 50%. Rock quality designation (RQD) has several definitions.