The cable tool is a percussion drill rig or spudder. A twenty-foot piece of casing is lifted up to the stem. The stem is a solid piece of steel with a carbide bit on the end of it. The bar (stem) weighs 1,987 pounds.
The stem is then lowered inside the 20-foot piece of steel casing. A hardened shoe is welded at the bottom of the steel casing. There is a set of blocks that bolt on the top of the stem; this is for pounding the casing into the ground.
The blocks are then taken off the stem; some ground came into the casing. This ground is called a plug. The stem is then lowered until it hits the plug. The stem is controlled by a walking arm that brings the stem up 24 inches then drops the stem. This motion pulverizes the ground, the stem is then removed from the casing and a bailer is lowered into the casing. The bailer is a hollow piece of pipe with a steel ball at the bottom.
When the bailer is raised and lowered off the bottom of the pulverized ground, it pulls the cuttings and pulverized ground into it. It is then emptied and the stem goes back down until all the material is removed from the casing and then the procedure is then repeated.
When your casing reach’s the water table, you need to add water to keep the material from being pushed into the casing from the underwater pressure. When you reach the right colored material it is time to set your screen.
The screen is a 3-foot piece of stainless steel with slots in it. The slots are 8, 10, 12, 15 ect. Thousands of an inch apart. This is to keep the sand, and/or gravel from coming into the casing.
Once the screen is pushed to the bottom of the cleaned out casing with the stem, the stem is then used to pull the casing back so that the screen will be exposed 3′ out of the bottom of the casing without pushing out too far.