US2185478A

US2185478A - Tubing and casing head

Info

Publication number: US2185478A
Application number: US134797A
Authority: US
Inventors: Sheridan P Tschappat
Original assignee: Individual
Current assignee: Individual
Priority date: 1937-04-03
Filing date: 1937-04-03
Publication date: 1940-01-02
Anticipated expiration: 1957-01-02

Description

1940- s. P. TSCHIAPPAT 2, 5 73 TUBING AND CASING HEAD Filed April 3, 1937 3 Sheets-Sheet l s. P. TSCHAPPAT 2,185,478

v TUBING AND CASING HEAD Filed April 3, 1937 5' Sheets-Sheet 2 glwucmm Jamz, 1940. s. P. TSHAPPAT 2,185 478 TUBING AND CASING HEAD Filed ril 3, i937 5 Sheets-Sheet 5 patented jan. 2, 194G 'ATENT OFFICE TUBING AND CASING HEAD Sheridan P. Tschappat, Tulsa, Okla. Application April 3, 1937, Serial No. 134,797

3 Claims.

This invention relates to new and useful immovements in tubing and casing heads.

As is well known, it is the custom in oil well production practice to superimpose tubing and 6 casing supports, whereby a plurality of concentric fluid conduits may be suspended in the. well.

It is one object of this invention to provide improved means for connecting a casing support I and a tubing support and having certain characteristics making for increased safety and greater ease of assembly,.and also whereby the packing between the supports may be replaced without disturbing the well connections or having to lift the casing and its support.

An important object of 1 the invention is to provide improved means for connecting supports together and including an elastic packing element which is so arranged as to be distorted by said means when the supports are secured together. Another object of the invention is to provide an improved connection between supports wherein .a tubing support having a shoulder at its lower end is mounted on a flanged base member from which casing is suspended, andasplit ring, secured to the flanged base member, is adapted to overlie the flange on the upper end of the base member and to overhang the shoulder on the tubing support whereby vertical displacement of the support and member with relation to each other is prevented, the ring being split to facilitate application thereof so that a connection between said member and support may be readily made.

A further object of the invention is to provide improved means for connecting a tubing support and a vented base member having flanges at its .upper and lower ends and having an internal shoulder for receiving said tubing support, wherein anelastic packing element is mounted at the joint between the members and a detachable ring is arranged to fasten the base member and support together, said ring also engaging the packing element so as to distort the same into sealing position as the joint is made up.

A construction designed to carry out the invention will be hereinafter described, together with other features of the invention.

The invention will be more readily understood connected thereto in accordance with the invention,

Figure 2 is a plan view of the same,

Figure 3 is an enlarged, transverse, vertical, sectional view of the base member and support, 5

Figure 4, is a horizontal, cross-sectional view taken on the line 44- of Figure 1,

Figure 5 is a similar view taken on the line 5-5 of Figure 1,

Figure 6 is a plan view of the split retaining ring showing the same before assembly,

Figure 'I is a view, partly in elevation and partly in section of another form of the invention, and

Figure 8 is a horizontal, cross-sectional view, taken on the line 88 of Figure '7.

In the drawings, the letter A designates an annular flanged base member or casing head having a tubing support or head B superimposed thereupon.

The base member A includes a cylindrical body or shell 16 having an external annular flange H at its lower end, whereby the base member may be connected to a suitable support (not shown). The body has a vertical bore l2 .and is provided with internally screw threaded radial outlets or ports l3 for receiving outlet pipes or conduits (not shown). The bore of the body is provided with internal screw-threads above and below the ports and is adapted to receive the upper end of an outerwell casing 14 which is screwed into the lower end thereof.

The upper end of the bore of the body is enlarged whereby an internal annular countersunk shoulder i5 is formed. This shoulder is adapted to receive the lower end of the tubing support B. An external annular connecting flange I6 is provided on the upper end of the body I0, whereby said body may be connected with the tubing support, as will be explained. External vertical ribs l0 extend between the flanges on the body Ill strengthening the same.

The tubing support B may be of any suitable type, but for purposes of illustration a support is shown wherein an elongate tubular housing l'l, having an external annular flange l8 at its lower end, is adapted to rest on the shoulder l5 of the body In. The housing has a cylindrical bore 19 having a slip bowl 20 formed therein, and the usual slips 2| are mounted in the bowl 50 and grip a well tubing 22 extending therethrough. Superimposed packing rings 23 are carried on the upper ends of the slips and are held in position thereon by a split gland nut 24 screw-threaded into the upper end of the bore 55 of the housing. The usual internally screwthreaded radial ports 25 are provided in the wall of the housing below the slips for receiving outlet pipes (not shown) for conducting fluid from the bore of the housing. The lower end of the bore I9 is internally screw-threaded and receives the upper end of an inner well casing 26.

In providing a connection between the base member and support, an annular recess or oifset SS is provided in the upper end of the flange I8 on the tubing support. The provision of this oflset in the flange forms a comparatively narrow annular shoulder 3| at the lower end of the tubing support. When the support is resting on the shoulder 15 in the base member, as shown in Figure 3, the shoulder 3| is in horizontal alinement, or lies flush with, the upper surface of the flange It on the base member. An annular offset or recess 32 is formed in the enlarged portion of the bore of the body it and extends complementary to the offset in the flange I8 on the tubing support, whereby, when said support is in position on the shoulder E5 in the base member, an annular groove 33 is formed between said base member and support (Figure 3), and an annular elastic packing ring J5 is mounted in this groove. A split metal're-taining ring 35 overlies the flange E6 on the base member and is secured thereto by bolts 36 passing through openings 3"! in the retaining ring and openings 38 in the flange. The retaining ring is of such size that its inner portion overhangs the shoulder 3! on the tubing support B and when the bolts 36 are tightened the ring engages the upper surface of the flange 15 on the base member and the shoulder 3i thereby positively holding the tubing support in position on the shoulder I5. In moving the retaining ring to such position, the packing ring 3Q within the groove 33 is engaged by said ring and distorted into sealing position with the walls and bottom of the groove, providing a fluid-tight connection between the base member and tubing support.

For facilitating assembly, the retaining ring 35 is preferably of the sectional or split type, the sections thereof being connected by bolts 39 extending through openings 40 provided in upstanding ears 4i formed on the abutting ends of each section of the ring. Also, the opening 31' in the midportion of each section of the ring is internally screw-threaded to receive a stud bolt 36, which bolt is arranged to engage in a notch 38 provided in the outer periphery of the flange IE on the base member. Therefore, in positioning the retaining ring to surround the tubing support, the stud bolts are screwed into the openings 3'? in each section and the sections moved into position. The bolts 36' enter the notches 38, thereby at once alining the bolt openings in the flange H3 and the ring and affording a quickly made up connection, since the sections of the ring overhang the shoulder 3! on the support B and the stud bolts engaged in the notches 33 restrict upward displacement of said ring and support. The sections are then connected together by the bolts 39 extending through the ears 4! and the bolts 36 applied to furthersecure the ring to the flange E6 on the base member.

The retaining ring is cut away adjacent the ears tl to permit passage of tie down members 62 which extend upwardly from diametrically opposed lugs 43 depending from the flange 16 on the base member. These tie down members are used to prevent upward displacement of the base member, being secured-to a suitable support (not shown).

It will be seen that the retaining ring provides a positive connection between the base member A and the tubing support B by en gaging the shoulder 31 on the support to hold the same in position on the shoulder I5 in the upper end of the bore of the base member. Also, the ring may be quickly and easily secured in holding position around the tubing support by sliding each section into engagement around the support and connecting the sections by the bolts 39. Similarly, the ring .may be readily removed from engagement with the tubing support to permit repacking at this point without disturbing the well connections or lifting the casing 14 or member Ill. Since the stud bolts 36 are engaged in the notches 38" in such assembly it will be seen that a positive connection may be quickly made, addition of the bolts 36 strengthening the connection, thus providing a rugged, easily made, positive connection between the base member andtubing support.

It is also to be noted that the packing ring 34 is distorted into sealing position by the retaining ring as the connection is made, thereby providing a fluid-tight joint simultaneously with the making up of a positive connection between the base member and support.

In Figures 7 and 8, a slightly modifiedform of the invention is shown. The structure is exactly the same as that shown in Figures 1 to 6,.

with the exception that the inner well casing 25 is not screwed directly into the lower screw-' threaded end of the bore it? of the tubing supp port B. Instead, the upper end of the casing is connected in the lower end of the bore of a collar 50 which collar has its upper endex ternally threaded at 5!, whereby it may. be screwed into the bore IQ of the support B. The Y provision of the collar makes for easier assembly and also permits the inner casing to be of a smaller diameter than the diameter of the bore.

What I claim and desire to secure by Lettersv tubing head having an annular base engaging in said casing head and restingupon the shoulder thereof and forming with said flange an annular groove, an annular packing ring. disposed within said groove for sealing the joint between said casing head and said base, and'means to secure said tubing head within. said casing head.

2. A casing head and tubing head assembly as set forth in claim 1 wherein the tubing head has a shoulder substantially flush with the top of the surrounding flange of the casing head so that the securing means rests rigidly on said last named shoulder and rigidly upon said flange and distorts and covers the packing ring.

3. A casing head and tubing as set forth in claim 1 wherein the securing means is made as a split ring for application when tie members I are attached to the casing head, the flange of