US2117538A - Cement basket - Google Patents

Description

R. c. BAKER 2,117,5

CEMENT BASKET Filed July 19" 1937 0 "will"- INVENTOR, v .Esusaw CZ BAKEQ ATTORNEY I Patented May 17, 1938 unis STATES CEMENT BASKET Reuben 0. Baker, Coallnga, Calil'., assignor to Baker Oil Tools, Inc., Huntington Park, Calih, a corporation of California Application July 19. 1937, Serial No. 154,455

1 Claim.

This invention relates to appliances used during the operations of sinking an oil well bore and particularly pertains to devices of the character disclosed in my prior United States Letters Pat- 5 cut No. 1,561,768.

In this prior patent I have shown a collapsible basket structure circumscribing a well casing at a point along its length below cementing points J in the casing so as to create a barrier between the m casing and the wall of the well bore to enable trapping of cavings and prevent downward movement of cement discharged from the cementing ports.

In this manner the blank casing of a combination string may be cemented in without the cement 5 reaching the perforated pipe or the producing zone. It has various other uses, such as enabling cementing oil of intermediate water sands.

In this prior patent the basket was constructed of an inverted frusto-conical canvas bag secured 0 to a plurality of longitudinally extending flexlble arms secured at their lower ends to the casing and flaring outwardly so as to engage the wall of the hole and hold the upper end of the bag in contact therewith.

It is the principal object of my present invention to provide a generally improved collapsible basket structure of the character above discussed which is entirely metallic in construction and which will properly conform to the contour of w the bore without chance of by-pass openings due to folding or wrinkling.

One form which the invention may assume is exemplified in the following description and illustrated by way of example in the accompanying drawing, in which:

Fig. l is a view partly in side elevation and ply in vertical section disclosing the preferred form of my invention.

Fig. 2 is a plan view thereof partly in transm verse section.

. 3 is a transverse sectional view taken on line m of Fig. 1. r

Fig. 4 is a view in elevation of one of thefpetals forming the basket. 45 Fig. 5 is a view in side elevation showing the cement basket connected in a cementing string.

Referring more particularly to the accompanying drawing, III indicates what is commonly.

mown as a cement basket for use in forming a 50 barrier between a well casing or tubing and the wall of the bore.

This device consists'of a nipple II or a section of well casing or tubing or other cylindrical memher which may be incorporated in a string of casm ing or tubing.

Arranged about theexterior of this member H at equally spaced distances apart are ribs 32 formed of flat flexible spring steel or other suitable" material. The lower ends of these ribs it are secured by welding or otherwise to the mem- 5 her II. From their lower ends the ribs extend upwardly of the member at an angle thereto so as to form an inverted frusto-conical framework about the-member H.

The upper extremities of the ribs H are curved i0 inwardly and then upwardly to slidingly engage the periphery of the member II as illustrated.

Secured to the inner face of each rib i2 is a petal I l formed preferably of flexible sheet brass or other similar and suitable material. lb

Each petal is narrower at its lower end than its upper end so when assembled the petals will form an imperforate inverted frusto-conical basket surrounding the member H The petals overlap as illustrated so that the basket may be collapsed about the member II but the inherent spring qualities of the ribs l2 will tend to maintain it fully expanded.

From the foregoing and from the drawing it is obvious that the present cement basket is made up of a number of circumferentially overle'p ping individual metal petals held in place with reenforcing spring steel ribs. The normal condition of the upper end of the basket is expanded so that it will conform to the diameter of the hole into which the member H is run on the well casing or tubing. When running in the hole, the upward force 01 the mud fluid tends to close in the "petals to more or less conform to the outside diameter of the member H so that any dls- 5m tortion of the basket while it is being lowered into the hole is thus avoided. Immediately upon the member H, or the casing or tubing upon which the basket is mounted, coming to rest in the bore, the'mud pressure on the basket assembly is rew lieved, permitting the petals to expand to their normal position with the upper portion of the basket forming a seal against the wall of the hole.

It is thus obvious that thereafter cement or other material may be ejected from the casing or tubing, or member H, above the basket, and that the latter will prevent its passing downwardly into the space around the tubing or casing below the basket.

The present device has a varied number of 50 uses, but its principal use is on a combination string, that is, a single string of well casing composed of an upper section of blank casing and a lower section of perforated casing, which is to be run into the producing zone. The basket is posiconical basket therefor arranged about the exterior thereof with its smaller end tightly embracing said tubing and with its upper and larger end of a diameter normally considerably larger than the exterior diameter of the tubing and,

2,117,:sse

tioned between these two sections so that the section of blank casing may be cemented off with- I concentric with respect thereto,'said basket comprising a plurality of flexible metallic ribs spaced equal distances about said tubing and secured at their lower ends thereto and extending longitudinally thereof with their upper ends spaced radially outward from the tubing, and apetal like segment of relatively thin flexible sheet metal secured ,to each rib, the contiguous edges of said petals circumferentially overlapping when the basket is in normal position so as to enable the petals to move circumferentially with respect to each other and enable the basket to be collapsed about said tubing, the upper extremities of said ribs being curved inwardly and then upwardly to slidably engage the exterior of said tubing. REUBEN C. BAKER.

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