Schlumberger

Technical Paper: Deepwater Geohazard Prediction Using Prestack Inversion of Large Offset P-wave Data and Rock Model

Society: Other
Paper Number: 1452612
Presentation Date: 2002
 

Abstract

Successful deepwater drilling is defined as reaching the total well depth in the desired hole size safely (i.e., not exceeding the fracture pressure) while controlling hydrocarbon or water influx and ensuring that casings are placed across desired intervals. The oil and gas industry has succeeded in this mission thousands of times around the world but drilling challenges abound, especially in deepwater. These challenges include: Smaller tolerance between pore pressure and fracture pressure causing narrow pressure margins while drilling (What is the proper mud weight window?); Shallow-water flow hazards due to pressured aquifer sands (How do you predict occurrence before spudding a well?); Excessive casing programs/small hole at total depth or unable to reach total depth (How do you design a proper casing program i.e., depths and sizes?); Slow rate of penetration and incorrect use of bit types combined with excessive bit wear (How do you minimize rig time without sacrificing safety?).