Bulletin . 6 bailers an hour,162-185. Water sand, 1,435-1,452. Texas Pacific Coal Satterfield 16 First water, 225. Third water, 1,300- & Oil Co. Second water, 765. 1, water, 1,535-1,555. a Water in Zone B reported to the writer by drillers, but not logged. Water-bearing beds classed as upper wTater lie above 800 feet. Thisupper water is not shown in Plate V. The salt water of Zone A liesbetween these upper waters and the producing formations. Theimportance of identifying and logging these upper waters should notbe discounted, but the present purpose is to show how to plan a drill-ing
Bulletin . 6 bailers an hour,162-185. Water sand, 1,435-1,452. Texas Pacific Coal Satterfield 16 First water, 225. Third water, 1,300- & Oil Co. Second water, 765. 1, water, 1,535-1,555. a Water in Zone B reported to the writer by drillers, but not logged. Water-bearing beds classed as upper wTater lie above 800 feet. Thisupper water is not shown in Plate V. The salt water of Zone A liesbetween these upper waters and the producing formations. Theimportance of identifying and logging these upper waters should notbe discounted, but the present purpose is to show how to plan a drill-ing program that will give permanent protection from infiltratingwaters. The Big salt water, Zone A, is more important than all otherwater-bearing strata because (1) it has a fluid level that fills drillingholes to the surface and is therefore potentially more dangerousshould it flood the oil sands; (2) the water sands in this zone are strati-graphically continuous throughout the area; and (3) the flow is. Depth 3603DIAGRAMMATIC CROSS SECTION OF A GROUP OF WELLS NEAR RANGER, TEXAS APPLICATIONS OF THE PRINCIPLES OF PROSPECTING. 157 greater than from any other zone. In drilling wells the water ofZone A has been excluded with 10-inch casing. Drillers have told the author that water is found in the formationsof Zone B in almost every well. This water is not logged, but is con-sidered to be near the top of the zone. Probably more water wasbeing developed in Zone B in January, 1921, than when the first wellswere drilled. The normal pressure of the water sands of Zone Bhad increased to an average hydrostatic head of 2,200 feet per squareinch on account of water let into the sands by the removal of thecasing that shut off Zone A. The quantity of water capable of doingdamage to oil production is also increased. In the general program for casing, the salt water of Zone A is ex-cluded during drilling with a 10-inch casing, which is landed at afairly uniform stratigraphic level. The depths of
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