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382 Andrzej Witkowski

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Andrzej WITKOWSKI

SOME ECONOMIC-GEOLOGICAL ASPECTS OF DEEP BORĘ HOK.ES MADĘ WITHIN THE POLISH LOWLAND AREA

Summary

The articłe presants setne ramarks reiated to the deep borę holes madę by vartous geologkał entenpnises otf the Central Office of Geology for the Geologioal Institute. Ab a basis for clearing of accounts between the kwestor and 'the conibractars serve prdoe-lists for deep drilłtogs CWG 3/72.

Based on the critkal analysis of the indiyiduel sectdons of a price-list the author calis ki cjoiestian the lagitaraacy of the clearing of accounts witłi iregard to the interwal 3000—3200 m tor driUimgs to a depth of 3200 m aocording to the prices oorresponding to the interwal of 4500 m, and he postulates for the dłsttoct dependence of the prices of the indiwidual sedtions upon the type of drilling trig used. Thia postutete paritaculiarly ooncems drUliings to a depth 3200—3500 m, where the dif-ferentdation af the <prices of assesnhly and disassembly of the same drilling rlg — calculated Sn the category to 4500 m, insbead in a tower category appropriate to a glvm type of tóg -— amounts to atauost 2 mUBon zlotys.

The differentiation of proces of 1 m of drilling depends matoły upon the so-called category of rock and upon the modę of drilling — using a Ut or a core drilL The categotóes of noctes presented to the price-Hst dŁfferentiate prices aocording to the fawimdual depth intervałs — from 614 to 127.500 zlotys. Thds causes tintotenrupbed discussion between 1he drilling service of the executor and thait of the investor. On the basis of many years’ experiences One can say that the distinguaahed categories