Abstract
Abstract A 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.
Highlights
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]
This will allow for a qualitative assessment of the tool with a specific lifting force coefficient and assign it to one of the categories: 1) the model does not reach the average technical level; 2) the model corresponds to the average level, but does not reach the modern world level; 3) the model exceeds both the average and the modern world technical level
A complex criterion has been developed for assessing the technical level of magnetic fishing tools of any size and design
Summary
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]. Haughton and Connell [4] suggested that circulation of drilling mud do not transport larger metal debris to the surface These cuttings accompany the drilling process and may cause the failure of the rock destruction tool. To retrieve emergency objects from the well without their preliminary destruction, fishing tools of mechanical, hydraulic and magnetic action are used [7, 8]. It is established [9, 10] that tools based on permanent magnets are the most effective of all types of fishing tools. The aim of research is development of a new approach to assessing the technical level of magnetic fishing tools of various types and designs
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