Drilling and Well Completions

Beck, Frederick Eugene; Boone, Daniel E.; Desbrandes, Robert; Wojtanowicz, Andrew K.; Johnson, Pauline; Lyons, William C.; Miska, Stefan; MUJEEB, A; Nathan, C. C.; Russell, Chris S.; Shahraki, Ardeshir K.

doi:10.1016/b978-088415642-0.50005-9

Cited by 10 publications

(4 citation statements)

References 11 publications

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“…Due to the complex dynamics inherent within drill-strings and their frictional interactions with the borehole, they are highly susceptible to unwanted oscillatory effects, which come in three primary forms, namely torsional [4][5][6][7], lateral [7,8] and axial [7,9] vibrations. These problems occur in all types of well configurations (vertical [10,11], directional [11] and horizontal [11][12][13]) and their accompanying drilling methodologies (rotational [14] and percussive [14]) (Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

“…This paper focuses on a class of torsional vibrations known as stick-slip oscillations [16]. Stick-slip is one of the most commonly encountered vibration phenomenon in any type of well and is the most common reason for down-hole tool and tool joint failure [10]. Thus, stick-slip has garnered great interest in its cause as well as its necessary prevention.…”

Section: Introductionmentioning

confidence: 99%

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Feedback control method to suppress stick-slip in drill-strings featuring delay and actuation constraints

MacLean

Vaziri

Aphale

et al. 2021

Eur. Phys. J. Spec. Top.

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In this work, performance of a modified-integral resonant controller with integral tracking is investigated numerically under the effects of actuator delay and actuation constraints. Actuation delay and constraints naturally limit controller performance, so much so that it can cause instabilities. A 2-DOF drill-string m with nonlinear bit–rock interactions is analysed. The aforementioned control scheme is implemented on this system and analysed under the effects of actuation delay and constraints and it is found to be highly effective at coping with these limitations. The scheme is then compared to sliding-mode control and shows to be superior in many regimes of operation. Lastly, the scheme is analysed in detail by varying its gains as well as varying system parameters, most notably that of actuation delay.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Feedback control method to suppress stick-slip in drill-strings featuring delay and actuation constraints

MacLean

Vaziri

Aphale

et al. 2021

Eur. Phys. J. Spec. Top.

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“…Consequently, many solid zinc-based scavengers would dissolve at highly basic conditions (water-based drilling muds are basic) to yield free zinc ions capable of scavenging H 2 S. ,,, However, at pH greater than ~ 11, zincate ion Zn(OH) 4 2– could form. While the zincate ion might still be effective in scavenging H 2 S, excess amounts of Zn(OH) 4 2– could negatively interfere with the mud rheological properties, which might be detrimental to the drilling mud performance. ,,, …”

Section: Introductionmentioning

confidence: 99%

“…While the zincate ion might still be effective in scavenging H 2 S, excess amounts of Zn(OH) 4 2− could negatively interfere with the mud rheological properties, which might be detrimental to the drilling mud performance. 32,33,44,45 An alternative option to copper and zinc compounds are iron compounds. However, unlike zinc and copper, where metal sulfides form through a simple precipitation reaction, the interaction between iron compounds and H 2 S is complex and might involve multiple steps and reaction products.…”

Section: Introductionmentioning

confidence: 99%

H₂S Scavenging Capacity and Rheological Properties of Water-Based Drilling Muds

et al. 2020

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Drilling hydrocarbon formations where hydrogen sulfide (H 2 S) is present could lead to the carryover of H 2 S with the drilling mud (i.e., drilling fluid) to the surface, exposing working personnel to this lethal gas. Additionally, H 2 S is very corrosive, causing severe corrosion of metal parts of the drilling equipment, which in turn results in serious operational problems. The addition of an effective H 2 S scavenger(s) in the drilling mud formulations will overcome these health, safety, and operational issues. In this work, zinc oxide (ZnO), which is a common H 2 S scavenger, has been incorporated into waterbased drilling mud. The H 2 S scavenging performance of this ZnOcontaining drilling mud has been assessed. Additionally, drilling mud formulations containing either copper nitrate (Cu(NO 3 ) 2 •3H 2 O) or potassium permanganate (KMnO 4 ) have been prepared, and their H 2 S scavenging performances have been studied and compared to that of the ZnO-containing drilling mud. It has been observed that the scavenging performance (in terms of the H 2 S amounts scavenged up to the breakthrough time and at the saturation condition) of the ZnO-containing drilling mud is very poor compared to those of the copper nitrate-containing and KMnO 4 -containing drilling muds. For instance, the amounts of H 2 S scavenged up to the breakthrough time by ZnO-containing, copper nitrate-containing, and KMnO 4 -containing drilling muds were 5.5, 15.8, and 125.3 mg/g, respectively. Furthermore, the amounts of H 2 S scavenged at the saturation condition by these drilling muds were, respectively, 35.1, 146.8, and 307.5 mg/g, demonstrating the superiority of the KMnO 4 -containing drilling mud. Besides its attractive H 2 S scavenging performance, the KMnO 4 -containing drilling mud possessed more favorable rheological properties [i.e., plastic viscosity (PV), yield point (YP), carrying capacity of the drill cuttings, and gelling characteristics] relative to the base and the ZnO-containing and copper nitrate-containing drilling muds. The addition of KMnO 4 to the base drilling mud increased its apparent viscosity, PV, and YP by 20, 33, and 10%, respectively. Additionally, all tested drilling muds possessed acceptable fluid loss characteristics. To the best of our knowledge, there are so far no published studies concurrently tackling the H 2 S scavenging (i.e., breakthrough time, breakthrough capacity, saturation time, saturation capacity, and scavenger utilization) and the rheological properties of water-based drilling muds, as demonstrated in the current study, highlighting the novelty of this work.

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