Packless stuffing box annular seal assembly
a sealing assembly and stuffing box technology, applied in the field of stuffing boxes, can solve the problems of high replacement cost, inconvenient replacement of seals, and inability to last a long tim
Inactive Publication Date: 2008-08-14
ARNOLD JOHN
View PDF10 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
[0002]The present invention provides a stuffing box having an improved design of a pressure active seal assembly consisting of pairwise arrangements of hollow cones, which adds unexpected long life to the seals thereof.BACKGROUND OF THE INVENTION
[0007]Another object of this invention is the provision of slots in the cones, which allow for expansion and contraction of the cones, according to ambient temperature and pressure conditions. This allows the cones to maintain their function of sealing the rod.
[0009]A significant object of the current invention is to provide a sealing mechanism for an oil producing unit that is significantly more durable than current devices of the same service. Thus, an important objective is to provide more time between replacement services for seals in an oil pumping unit.
Problems solved by technology
The difficulty with graphite seals, or seals of other soft material, is that they are not durable.
Seals must be replaced frequently, at high replacement cost, due to manpower needs, replacement materials, and down time of the pumping unit.
Yet, prior to the present invention, it was difficult to engineer hard materials to produce seals of long life and duration.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0022]Detailed descriptions of the preferred embodiment are provided herein. It is to be understood, however, that the present invention may be embodied in various forms. Therefore, specific details disclosed herein are not to be interpreted as limiting, but rather as a basis for the claims and as representative basis for teaching one skilled in the art to employ the present invention in virtually any appropriately detailed system, structure or manner.
[0023]FIG. 1 discloses the overall structure of the novel packless stuffing box 100 of the current invention. The ‘box’ is actually a cylindrical tube, with sealing elements inside the tube.
[0024]The main body of the outer tube 200 has upper and lower end caps, 20 and 40, respectively. The entire unit is designed to fit snugly around a polished rod, at the lower end thereof, near the borehole exit.
[0025]A schematic depiction of stuffing box 100 is shown in FIG. 2. The hollow nature of the tube 200 is emphasized in this depiction.
[0026]...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
An improved annular seal assembly and packless stuffing box for an oil pumping unit of the type having a polished rod reciprocatingly extending therethrough and downhole to a pump located at the lower end of a borehole. The stuffing box has a main body that terminates in a tubing adaptor at the lower end thereof by which it can be mounted to the upper end of the tubing of a wellhead. The main body houses the annular seal assembly that includes a pressure set seal pack for sealingly engaging the polished rod. The polished rod reciprocatingly extends through the seal assembly and main body. The seal assembly includes paired metal annular cones which are capable of sealing under conditions present in the stuffing box. The seal assembly withstands such conditions far longer than traditional seal assemblies, thus reducing cost and downtime of the pumping unit.
Description
RELATED U.S. PATENT DOCUMENTS[0001]This patent application is an original patent application in the United States. No federal funding was used in the development of this invention.DESCRIPTIONSummary of the Invention[0002]The present invention provides a stuffing box having an improved design of a pressure active seal assembly consisting of pairwise arrangements of hollow cones, which adds unexpected long life to the seals thereof.BACKGROUND OF THE INVENTION[0003]Standard oil pumping units, also known as pumpjacks, have several components that are essential for operation. One such unit is the polished rod, which is visible from the exterior of the unit. The polished rod moves up and down in a vertical plane, when the unit is in operation.[0004]The polished rod moves through a stuffing box, which contain seals that lubricate the polished rod, and yet seal the unit to prevent oil leaks. These seals are often constructed of graphite or other soft, malleable material, in order to closely...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(United States)
IPC IPC(8): E21B33/02
CPCE21B43/126
Inventor ARNOLD, JOHN
Owner ARNOLD JOHN