SPE Annual Technical Conference and Exhibition 2011
DOI: 10.2118/147100-ms
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The Practice and Evolution of Torque and Drag Reduction: Theory and Field Results

Abstract: INTRODUCTIONWith the global trend moving toward drilling deep water wells, ultra-extended reach wells (u-ERW) and complex geometry wells, we can no longer ignore the drilling limitations caused by high torque and drag forces. Extreme torque and drag, especially unplanned, can be detrimental to drilling operations. Over the years, engineers have developed numerous ways to challenge the drilling limitations by reducing torque and drag forces in order to drill further and deeper. This paper attempts to describe t… Show more

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Cited by 10 publications
(3 citation statements)
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“…Beads are inserted between the drill string and bore hole to reduce the coefficient of friction. It does not affect the chemical characteristic of the mud system [10].…”
Section: Wellpath Design 2 Light Weight String Components 3 Lubricantmentioning
confidence: 98%
“…Beads are inserted between the drill string and bore hole to reduce the coefficient of friction. It does not affect the chemical characteristic of the mud system [10].…”
Section: Wellpath Design 2 Light Weight String Components 3 Lubricantmentioning
confidence: 98%
“…With the gradual deepening of the development of oil fields, the number of complex structural wells such as high-angle wells, horizontal wells and multi-branch horizontal wells is increasing. The issue of realizing fast drilling and increasing the length of horizontal sections has become the focus of attention (Barton et al 2011;Mccormick and Chiu 2011;Liu et al 2016a, b). Since the 1980s, more and more downhole rotary drilling has been utilized in directional wells due to many advantages, such as increasing the rate of mechanical drilling, increasing the footage of a single drill bit, and achieving well path control.…”
Section: Introductionmentioning
confidence: 99%
“…The parameters included in the torque-and-drag equations are shown below. [1][2][3] Drag is directly proportional to the normal force, coefficient of friction, and pipe movement (formula (1)).Torque is directly proportional to the normal force, coefficient of friction, radius of the object that is rotating, and tubular movement (formula (2)). Reducing any of the components in the equation will ultimately reduce the torque or drag…”
Section: Introductionmentioning
confidence: 99%