Laserfiche WebLink
GUARD <br />RESISTIVITY <br />GAMMA RAY NEUTRON 0 ~ <br />A.R 1. Colibrafor Unify <br />0 170 300 9W ISW 0 ]000 <br />2000 <br />SALT <br />SALT <br />2100 <br />SALT <br />2100 <br />SALT <br />SALT <br />2300 <br /> <br />PROXIMITY <br />INDEX <br />0 1 <br />P"'I 2000 <br />2100 <br />1200 <br />2300 <br />Ftgure 5. 0-D Velot!ty Log. <br />cubic centimeter which is anomalously low for formations with high resistivity. The 3-D Velocity <br />Log indicates very homogenous beds of 15, 000 ft. /sec. velocity. The combination of ]ow shale <br />content, low hydrogen, high resistivity, low density and high velocity is a logging fingerprint for <br />salt. <br />Let us turn our attention to the use of logging tools whose purpose is to gather data to aid in <br />the completion and operating of wells in salt fields. <br />One of these services is [he Caliper which is designed to enter [he well bore with arms <br />closed. The Caliper is electronically controlled from the surface so that [he arms may be opened <br />as shown in Fig. 6. With control at the surface, it is possible to open the arms and record a log <br />and [hen return to [he bottom of the well bore [o make a repeat run. The desired sensitivity may <br />be gained by changing the length of the arms, which determine the maximum diameter that may be <br />recorded. Each of the three arms act independently, thus, the diameter recorded is that of a <br />circle described by the tips of the three arms. The spring tension on the arms tend to hold the <br />tool centered but this may not necessarily be the condition at all times when recording. One of <br />the latest features is the addition of surface equipment designed to compute the volume of the <br />borehole to an accuracy of "!-5%. <br />Figure 7 depicts the use of well completion logs. Curve # 1 indicates the diameter of the <br />well bore at first completion date. Curve # 2 indicates where a mechanical norther was used to <br />increase the well bore diameter at approximately 2, 440 and 2, 460 feet. The purpose of the notch <br />was to induce a fracture in the lower salt in an attempt to produce this section firs[. <br />Curve # 3 represents the use made of a magnetic Casing Collar Locator to determine the <br />depth of tubing collars and inflatable packer. It was desired to place the n~o packers so they <br />would straddle the lower notch. <br />Curve # 4 shows [he diameter after pumping into [he cell for a period of 45 days. Note the <br />sloughing of siltstone from 2, 3-10 to 2, 350 feet. <br />60 <br /> <br />SULK DENSITT <br />Grem~/ CC <br />7] 7.1 7.6 7B <br />