Cable tool drill rigs are a traditional way of drilling water wells and continue to be the most practical drilling method for large diameter, deep water wells in the Pacific Northwest, especially for deep wells in gravel aquifers.
[pdf] Price-performance leaders include Jining Hengwang's crawler rig ($1,400 at volume) and Henan Ocean's diesel unit ($3,000 fixed price). For hard rock applications, Shandong Instanton's 5.0-rated rig provides premium capabilities at mid-range pricing.
[pdf] Before starting casing, the drilling supervisor should hold a pre-job safety meeting and confirm the following with the crew: 1. Remove unnecessary tools. 2. Good Housekeeping before the job 3. Rig up Casing handling equipment: Using appropriate hand. .
A circulation sub, fitting the casing thread, equipped with a WECO connection, shall be readily available on the rig floor at all times during casing running.
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