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Technical Paper: Conical Diamond Element Bit Sets New Performance Benchmarks Drilling Hard and Abrasive Formations, Offshore Netherlands

Society: SPE
Paper Number: 175859
Presentation Date: 2015
 Download: Conical Diamond Element Bit Sets New Performance Benchmarks Drilling Hard and Abrasive Formations, Offshore Netherlands (2.73 MB PDF) Login | Register

 

Abstract

In The Netherlands the operator drilling in the Southern North Sea area had to drill through Germanic Trias super group sequences to reservoir sections in Buntsandstein formations of lower Triassic series at a depth of about 9,800-ft TVD that are highly abrasive and hard sandstone formations. These formations are overlaid by milddle and upper Triassic clay stones interbedded with hard dolomite stringers. The compressive strength of these formations ranges from 5,000-15,000 psi in the upper clay stones and from 15,000-30,000 psi in the Buntsandstein group.

Drilling the build and turn wellbore profiles using a directional BHA with roller cone and/or PDC has been challenging. In offsets, these bit types produced slow ROP and short run lengths, requiring multiple bit trips to complete the hole section. In many cases, the bits were pulled in poor dull condition with severe cutting structure damage. In some cases, the operator was forced to use diamond-impregnated bits on turbine to TD the section.

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