Field results

Field Results – Drilling long HTHP multi-lateral wells

The AST principle provides a stabilized load on the bit in lateral and extended reach wells to prevent erratic reactive torque that would otherwise reduce drilling efficiency.

Objectives

The Smørbukk Sør province in the Statoil-operated Åsgard field represents a significant drilling challenge with long multilaterals penetrating abrasive sands at HTHP conditions. AST technology was mobilized early in the project.

Results

In support of a step-by-step approach, the operator conducted several direct comparisons to verify the added value of the new technology. It was found that an AST would reduce the weight-on-bit requirement and consequently reduce stick-slip from pipe friction while at the same time increase penetration in the range of 15-100%.

Value

Based on the improved progress, approximately two days or about USD 1.6 million was saved per lateral.

rop-bars

ROP bars showing the effect of the AST. WOB is also plotted to illustrate the highly valued reduction in string compression.

The Åsgard field is a state-of-the-art subsea development with floating surface processing facilities.

Tool

6 ¾” AST

Client

Statoil

Country

Norway

Field

Åsgard / Smørbukk Sør

Well

Q-1 and Q-4

Rig

Transocean Searcher

Section

8 ½” horizontal multi laterals

BHA

8 ½” bit (PDC) PowerDrive RSS and Schlumberger LWD suite

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