NGWA Test Questions with Correct Answers Graded A+

NGWA Test Questions with Correct Answers Graded A+ Define a water well. - Answers An excavation or structure created in the ground by digging, driving, boring, or drilling to access groundwater. List all the parts of a cable tool drill string. - Answers Drill bit Drill stem Rope socket Jars Swivel Fishing tools (when needed) List all the parts on a rotary drill string. - Answers Drill bit Drill pipe Drill collar Kelly (for traditional rotary rigs) Stabilizers Crossover subs Tool joints Float valve (optional) Name and describe 4 methods of developing a well. - Answers Airlifting Surging Jetting Bailing List 3 types of bailers for cable tool drilling and the purpose for each. - Answers Sand, valve, junk. How do you dress a cable tool bit? - Answers Dressing a cable tool bit involves reshaping and sharpening the bit to ensure effective drilling. 1. Inspection 2. Heating 3. Forging 4. Tempering 5. Final Sharpening What type of maintenance is used on rotary bits? - Answers Inspection Cleaning Lubrication Sharpening or Replacement Monitoring Torque and Weight What is a well screen? - Answers A well screen is a filtering device placed at the bottom of a well, usually in the water-bearing formation, to allow groundwater to enter the well while keeping out sediment, sand, and other fine materials. List the common types of fishing tools and explain how they are used. - Answers Overshot Spear Fishing Magnet Junk Basket Impression Block How is the screen sized in sand and gravel wells? - Answers Grain Size Analysis Slot Size Selection Screen Length Name the four cables on a cable tool rig and tell what they do. - Answers Drilling Line (Mainline): This is the primary cable used to raise and lower the drill string, which includes the drill bit, drill stem, and jars, into and out of the wellbore. Sand Line: This cable is used to operate the bailer or sand pump to remove cuttings, debris, and water from the wellbore during and after drilling operations. Bull Rope: This cable is used to hoist heavy components of the rig or drilling tools, such as the drive clamps or swivel, and assist in rigging operations. Casing Line: This cable is used to raise, lower, and set casing in the well. It helps position and secure the casing strings as they are installed into the wellbore to prevent collapse or contamination. What purpose does a cat-head serve in cable tool work and in auger drilling? - Answers Cable Tool Drilling: In cable tool drilling, the cathead is a rotating drum or spool on the rig. It is used to apply or release tension on the various cables (such as the drilling line or sand line) by wrapping the cable around the drum. By controlling the friction, the operator can raise, lower, or hold heavy drilling tools in place. Auger Drilling: In auger drilling, the cathead is similarly used to apply or release tension on lines or ropes that assist in handling the auger or other equipment. It allows for the controlled raising and lowering of the auger or drill string, making it easier to operate the equipment manually. How does a drill wire rope differ from a bailer wire rope? - Answers The drill wire rope is heavier and stronger to support drilling operations, while the bailer wire rope is lighter and more flexible for debris removal. Explain the difference between rotary "table drive" and "top head drive". - Answers A rotary table drive rotates the drill string from the rig floor using a Kelly and requires more time to add pipe sections during drilling. A top head drive rotates the drill string from the top, allowing for continuous drilling and faster operations without the need for a Kelly. What purpose does the drilling fluid serve in rotary drilling? - Answers 1. Cools and lubricates the drill bit 2. Removes cuttings from the wellbore by carrying them to the surface