{"product_id":"2940013563902","title":"Horizontal Trajectories of Rotary-Drilled Holes","description":"This Bureau of Mines report investigates the horizontal trajectory of boreholes drilled in coalbeds using the rotary drilling technique. Test holes drilled in coalbeds showed that the path of a borehole in the horizontal plane depends on drilling assembly configuration, drill bit rotation, and coalbed geologic features. An assembly that contained an 18-ft (5.5-M) long drill collar and two centralizers had the best horizontal stability evidenced by trajectories that deviated less than 16 ft. (4.9 M) from a target at 1,000 ft (305 m). Removal of one of the centralizers resulted in a loss of control of hole trajectory in the horizontal plane. Generally, holes tended to turn to the right, presumably because of right-hand rotation of the bit. Deviations from the original bearing line were as much as 200 ft (61 m) or more at a depth of 1,000 ft (305 m).","brand":"1001 Property Solutions LLC","offers":[{"title":"Default Title","offer_id":47079578534128,"sku":"2940013563902","price":1.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0737\/7593\/9824\/files\/2940013563902_p0.jpg?v=1763582406","url":"https:\/\/shop-qa.barnesandnoble.com\/products\/2940013563902","provider":"Barnes \u0026 Noble (DEV)","version":"1.0","type":"link"}