Drilling tool filter screen for realizing protection of internal wall of drilling tool

A filter screen and drilling tool technology, which is applied in the direction of drilling tools, drill bits, filtration and separation, etc., can solve the problems of short service life of drilling tools, easy occurrence of drilling tools, and large erosion, so as to prolong service life, stabilize flow rate, and reduce erosion wear effect

CN101530692AInactive Publication Date: 2009-09-16张继川
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2009-09-16
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a drilling tool filter screen for realizing protection of the internal wall of a drilling tool. The drilling tool filter screen is arranged at the upper part of a small end of the internal thread of the drilling tool and an opening thereof faces downward; the drilling tool filter screen adopts a mode that drilling fluid flows into an inner cavity of the filter screen by filter holes on the filter screen from the outer part of the filter screen to filter impurities. The drilling tool filter screen for protecting the internal wall of the drilling tool guarantees that the impurities in the drilling fluid are filtered, simultaneously can protect the internal wall of the drilling tool effectively, reduce drilling tool accidents caused by washing out and abrasion of the drilling fluid to the internal wall of the drilling tool, prolong the service life of the drilling tool and can be widely applied to fields of drilling operation of petroleum gas.
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Description

technical field

[0001] The invention relates to a drilling tool filter screen, in particular to a drilling tool filter screen for protecting the inner wall of a drilling tool. Background technique

[0002] In the current oil drilling operations, in order to ensure the normal operation of sophisticated and complex downhole tools and instruments and avoid clogging of impurities, it is generally used to filter the impurities in the drilling fluid entering the drilling tool by installing a drilling tool filter on the drilling tool, and then Avoid downhole complications caused by impurities in the drilling fluid blocking the water hole of the drilling tool. see figure 1 At present, the conventional drilling tool filter screen 31 is suspended on the step 32 at the small end of the internal thread of the drilling tool, and the opening direction of the filter screen is upward, and this opening is the entrance for drilling fluid to enter the drilling tool screen. The screen is inst...

Examples

Embodiment Construction

[0015] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0016] The core of the present invention is that the drilling tool filter screen protecting the inner wall of the drilling tool filters impurities in a manner that drilling fluid flows from the outside of the filter screen through the filter holes on the filter screen into the inner cavity of the filter screen.

[0017] see figure 2 , a drilling tool filter screen for protecting the inner wall of the drilling tool, comprising: a stabilizing ring 1, a filter screen 2 and a support seat 3, the filter screen 2 is connected with the stabilizing ring 1 and the support seat 3 respectively, the filter screen 2 is funnel-shaped, and The diameter of the end connected to the stabilizing ring 1 is smaller than the diameter of the end connected to the support seat 3 . The filter screen 2 can also be cylindrical.

[0018] In this example, the support base 3 is provided with an...