Wells – Brushing – scraping – cutting or punching-type cleaners – On sucker rod
Reexamination Certificate
1998-09-01
2001-02-06
Dickson, Paul N. (Department: 3618)
Wells
Brushing, scraping, cutting or punching-type cleaners
On sucker rod
C166S241400
Reexamination Certificate
active
06182754
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a method of preventing parafin wax scrapers on a reciprocating sucker rod from wearing grooves in the interior walls of well tubing, and a scraper constructed in accordance with the method.
BACKGROUND OF THE INVENTION
Sucker rod scrapers are attached to reciprocating sucker rods in order that paraffin wax may be scraped from well tubing as the sucker rod reciprocally moves up and down. The form of scraper in most common usage consists of a plurality of parallel vanes with channels for the flow of fluids between the vanes. The problem with these scrapers is that over prolonged usage the vanes moving up and down wear grooves in the well tubing.
Helical scrapers have been used in an effort to avoid wear grooves. The theory behind helical scrapers is that they provide even wear around the 360 degree inner circumference of the well tubing and do a better job of cleaning paraffin wax from the well tubing. An example of a helical scraper is U.S. Pat. No. 4,532,988 which issued in 1985. One problem with such helical scrapers is that they constrict the flow of fluids up the well tubing. Another problem with such helical scrapers is that the flow of fluids along the 360 helical flight of the scraper tends to exert a torsional force upon the sucker rod.
SUMMARY OF THE INVENTION
What is required is a method of preventing scrapers on a reciprocating sucker rod from wearing grooves in well tubing while providing less restriction of fluid flow and less torsional force.
According to one aspect of the present invention there is provided a method of preventing scrapers on a reciprocating sucker rod from wearing grooves in well tubing. The first step involves providing at least one scraper having a body with two opposed spiral vanes each of which extends 180 degrees around the body and flow channels positioned between the spiral vanes. The second step involves securing the scraper to a reciprocating sucker rod. The third step involves positioning the sucker rod within well tubing having an inner circumference with the two opposed spiral vanes engaging 360 degrees of the inner circumference of the well tubing while fluids bypass the body by means of the flow channels.
With the method, as described above, there is still 360 degree coverage of the well tubing but with less restriction of fluid flow through the well tubing and less torsional force being exerted upon the sucker rod.
According to another aspect of the present invention there is provided a sucker rod scraper which includes a hub-like body. The body has two opposed spiral vanes each of which extend 180 degrees around the body. Means are provided for securing the body to a sucker rod.
According to another aspect of the present invention there is provided a sucker rod scraper/sucker rod combination which includes a sucker rod having an elongate cylindrical body. At least one sucker rod scraper is secured to the sucker rod. Each sucker rod scraper includes a hub-like body disposed around the elongate cylindrical body of the sucker rod. The hub-like body has two opposed spiral vanes each of which extend 180 degrees. Flow channels are positioned between the spiral vanes. The flow channels have opposed ends parallel to the body of the sucker rod, such that flow both enters and exits the flow channels parallel to the elongate cylindrical body of the sucker rod.
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patent: 4532988 (1985-08-01), Hickman
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Brochure from Huber Flow Control for New Era Progressing Cavity NEPC Rod Guides, 1 page (double sided), undated.
David and Bujold
Dickson Paul N.
RG Industries Ltd.
Sliteris Joselyn Z.
LandOfFree
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