Removal of Debris from Deepwater Wellbores Using Vectored Annulus Cleaning System Reduces Problems and Saves Rig Time

Connell, Paul; Haughton, David

doi:10.2118/96440-ms

Cited by 3 publications

(1 citation statement)

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“…Accidents happening during the construction and operation of wells are characterized by a wide variety, as a result, metal debris remain on the bore-hole bottom [1,2]. In addition, a lot of metal cuttings remain in the wells after the milling operations as well as sidetracking [3]. Haughton and Connell [4] suggested that circulation of drilling mud do not transport larger metal debris to the surface.…”

Section: Introductionmentioning

confidence: 99%

Assessment of the Technical Level of Magnetic Fishing Tools

Romanyshyn

Bembenek

et al. 2020

Management Systems in Production Engineering

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AbstractA variety of magnetic fishing tools poses the task of the optimal choice of tool for eliminating accidents during the construction, operation and repair of wells. Existing criteria for assessing the quality of fishing magnets are characterized by the complexity of the determination and the ambiguity of the results. Therefore, the aim of research is development of a new approach to determining the technical level of fishing tools of various types and designs. A complex criterion has been developed that allows to evaluate the technical level of magnetic systems by correlating the actual and theoretical values of the total and specific lifting forces. Also it has been carried out a qualimetric analysis of magnetic tools, which are currently offered by world manufacturers. As a result, mathematical models are found that describe the average and modern world level of devices with specific lifting force. Technical decisions are proposed, the implementation of which in the design of magnetic systems of fishing tools will allow to achieve high values of lifting force. Application of the proposed complex criterion along with the results of qualimetric analysis will make it possible to objectively assess the technical level of magnetic fishing tools both at the design stage and during serial production.

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Section: Introductionmentioning

confidence: 99%

Assessment of the Technical Level of Magnetic Fishing Tools

Romanyshyn

Bembenek

et al. 2020

Management Systems in Production Engineering

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Understanding the Origin and Removal of Downhole Debris: Case Studies From the GOM

Javora¹,

Sanford²,

Qu³

et al. 2008

SPE International Symposium and Exhibition on Formation Damage Control

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Potential damage to the formation and generation of destructive wellbore debris can occur during perforating operations with shaped charges. One type of damage is to the formation, which is related in part to the powdered metals and metal alloys incorporated into the metal casings that contain the explosive charges in controlled debris perforating systems. Upon discharge, gun debris, including casing-metal residue and reaction products from the perforating system, can also contribute significantly to the overall amount of destructive wellbore debris generated. In addition, the debris often includes metal fragments from the wellbore casing, formation sand and other minerals, cement, and drilling fluid remnants that eventually are ejected into the wellbore. All of these materials can promote costly mechanical failures, contribute to well control problems, and hamper onsite operations. Various factors influence the ultimate generation of destructive wellbore debris. These factors include gun type, fluid type, fluid density, bottom hole pressure and temperature, and the specific wellbore configuration and completion scenario employed. While previous authors have addressed formation damage issues or the impact resulting from the use of various casing metals, this work focused on the actual downhole debris generated and collected from the wellbore just after perforating the well, and relates these findings to the influencing factors. With the use of advanced downhole filtration and collecting techniques, downhole debris was collected from a series of deepwater projects in the GOM. Debris analysis coupled with well completion information has been studied. Results from the examination of downhole wellbore debris collected after perforating the well is presented and discussed. Improved wellbore integrity and reduced risk are obtained through proper management of perforation and wellbore cleaning practices. Introduction Universally accepted, downhole debris is responsible for numerous problems associated with well completions, evidenced by the disclosures presented in each paper on this topic cited herein.1–10 Downhole debris has been associated with formation damage issues, failure in mechanical shifting of downhole flow control systems, retrieving temporary packer plugs, interfering with the setting of landing tools, and other problems. Much of the destructive wellbore debris is directly associated with tools used to perforate and the perforation process itself. Other debris can occur from material accidentally introduced from the surface. Several papers address the relative merits of zinc-cased perforating charges, steel-cased perforating charges, and a newly developed low-debris steel-cased perforating charges.1–4 Case histories demonstrating the usefulness of both zinc-cased2 and the newly developed steel-cased3,4 perforating charges are available in their respective publications. The perceived problems and benefits associated with zinc-cased charges has been described in some detail.5 Part of the potential damage from zinc-cased charges was found to be associated with the potential formation of complex zinc-hydroxy-chloride cements similar to the magnesia cements known as Sorel cements. In addition to acid, some products were reported effective in certain brine systems, but limited solubility of the product, incomplete control of precipitation, and potential formation damage prevented further application without modifying the product chemically. A method of preventing perforation damage from zinc-cased charges in high temperature applications by use of a long-chain organic acid was reported; 6 corrosion data was provided only for 22-chrome material.

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Refracturing Technology Restores Profitability of Older Unconventional Wells in Southeast New Mexico

Athavale

Onafowokan

Kasdano

et al. 2019

Day 3 Thu, February 07, 2019

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This paper covers four case histories of refracturing technology applied to under-stimulated wells, along with the benefits and well economics of returning these older wells to profitable production. Refracturing candidate selection criteria, operational execution, and well results for the four full-lateral refracturing projects are discussed. Refracturing candidate selection criteria were developed based on several parameters tied to improved production and project economics. Liner refrac methods were evaluated to select wells and field trials were performed to verify each method provided both ease of execution and isolation. Cemented liners and several expandable liner systems were evaluated. With effective mechanical isolation, highly effective modern frac designs can be applied successfully to refracs. The refracturing candidate wells outperformed the expected type curve and yielded positive economics. One cemented liner refrac showed poor isolation during treatment. Expandable liners showed good isolation, but some expandable technologies were better than others were. Rigorous planning and engineering were considered crucial to ensure trouble-free operational execution and to deliver an optimum wellbore for refracturing purposes. The criteria for refracs included in this paper are directly applicable for evaluating refrac candidates. The experience with isolation methods enables engineers to select the proper technology to seal old perforations.

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Removal of Debris from Deepwater Wellbores Using Vectored Annulus Cleaning System Reduces Problems and Saves Rig Time

Cited by 3 publications

References 0 publications

Assessment of the Technical Level of Magnetic Fishing Tools

Assessment of the Technical Level of Magnetic Fishing Tools

Understanding the Origin and Removal of Downhole Debris: Case Studies From the GOM

Refracturing Technology Restores Profitability of Older Unconventional Wells in Southeast New Mexico

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