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DOWNHOLE APPLICATIONS OF HALF AND FULL DOVETAIL GROOVE DESIGNS

IP.com Disclosure Number: IPCOM000250015D
Publication Date: 2017-May-16
Document File: 3 page(s) / 338K

Publishing Venue

The IP.com Prior Art Database

Abstract

This disclosure relates to overcoming the space limitations for a motor engagement design by utilizing a half dovetail groove.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 58% of the total text.

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DOWNHOLE APPLICATIONS OF HALF AND FULL DOVETAIL GROOVE DESIGNS

The motor lead extension connector’s O-ring engagement with the motor has gone through

numerous revisions over the years to meet the ever-increasing demand for downhole tool

reliability. This disclosure relates to overcoming the space limitations for a motor engagement

design by utilizing a half dovetail groove. This allows for the use of a 1 series O-ring instead of a

0 series O-ring for improved seal reliability and stress relaxation resistance the O-ring.

The designs for O-ring groove between the MLE connector and the motorhead have been 0

series O-rings. This poses increase risk of seal loss for many reasons including: compression loss

from machining tolerance stack up, low cross sectional area, low assembly damage resistance.

The diameters for standard 0, 1, and 2 series O-ring designs are .070, .103, and .139 respectively

with a tolerance of +-.003. The nominal 0 series cross sectional width is 68% of a 1 series and

50% of that of a 2 series.

The 0 series O-ring cross sectional area is 46% of that of a 1 series or 25% of that of a 2 series.

This means that gland machining and O-ring dimensional tolerances have a higher impact due to

compression changes. This also means the force to stretch and damage the 0 series O-ring on

assembly is significantly less. MLE power connector motor head O-ring gland design has

historically involved an assembly of two or three parts for face seal designs including the motor...