USRE21627E - Wellhead - Google Patents

Description

Nov. 19, 1940. A. J. PENICK mu.

WELLHEAD Original Filed Oct. 23, 1936 Reissued Nov. 19, 1940 UNITED STATES I PATENT OFFICE Arthur J. Penick and Kirby T. Penlck,

Hons

ton, T

2 Claims.

This invention relates to a wellhead and has particular relation to means for suspending a tubing in the well and supporting said tubing from the casing head.

It is another object of the invention to provide in combination, a casing head and a tubing hanger with novel means for supporting the hanger on the casing head whereby the hanger may be secured in place, said supporting means 7 being retractable to permit the tubing to be elevated or lowered whereby washing fluid may be conducted down through the tubing and discharged at any desired point in the well and returned up between the tubing and well casing to facilitate the washing operation.

It is a further object of the invention to disclose a novel method of washing the well.

A still further object of the invention resides in a provision of novel means for maintaining a packing between the hanger and the casing head.

With the above and other objects in view the invention has particular relation to certain novel features of construction, arrangement of parts and use and to a novel method, an example of which is given in this specification and illustrated in the accompanying drawing, wherein:

The figure shows a side viewof the head partly in section.

Referring now more particularly to the draw- 80 ing the numeral I designates the well casing attached to the upper end of which is the casing head 2 having the side outlets 3, 3 which may be equipped with the conventional gate valve, not shown. The casing head includes a suitable bonnet 4 which maybe secured thereon in any preferred manner preferably by bolts 6 with a leak proof gasket 6 between the adjacent parts. Bolted or otherwise secured on the bonnet there is a gate valve casing I and the joint between said valve casing and the upper end of the bonnet may be sealed by the gasket 8. The inside dimeter of the valve casing is approximately the same as that of the bonnet 4 and within the valve casing. around the passageway therethrough, are the upper and lower annular valve seats 19 and M which converge, -A tapering valve l I is arranged to be actuated into closed position against the seats 8 and ID to complete the closing of the passageway through the valve casing I. This valve may be actuated by the stem I2 in a conventional manner and this stem may be rotated by the hand wheel l3. There is atubular tubing hanger l4 adapted to be coupled to, and

to support, the tubing IS in the well. 86 Theupperendofthehanger l4isinternally threaded to receive the lower end of a lift pipe or nipple lia whereby the tubing may be lowered or elevated. When the tubing is'hung in place the lift nipple may be unscrewed and removed so as to permit the valve to be closed. 5

The hanger H has an external downwardly facing shoulder l8 therearound and surrounding the hanger beneath and abutting said shoulder there is the annular packing II. This packing is confined from beneath by the ring I8 which, 10 for the purpose of assembly may be sectional or split and which rests on the external upwardly facing shoulder 18 around the hanger.

AUuVe the shoulder Hi .the hanger is provided with an external annular groove 28 whose lower 15 side tapers downwardly and outwardly forming an annular bearing face 2| and threaded through the wall of the bonnet 4 are the retractable looking devices which comprise the outwardly extended stems 22 and the inner conical shaped ends 23 and surrounding the stems 22 and housed within the external annular flange 24 of the bonnet are the stufllng boxes 26.

Spaced beneath the locking devices is the in- SlCle annular channel 10 In Bile bonnet and In LIllS channel are the retractable hanger supports 21 WHICH have a SWlVGlllllg colmectlon Wlbfl corresponding radially extended stems 28. These stems have threaded connections with the walls of the bonnet and stufling boxes 28 surround 3o them and are housed within the external housings 38 of the bonnet.

The stems 22 and 28 may be turned so as to retract the locking devices and supports to clear the passageway through the bonnet 4 and the tubing 15,- assembled with the hanger l4 and the lift pipe l5a, may be let down into the well the. desired distance and washing fluid may be forced down through the tubing to wash the well and displace the heavy drilling fluid which will be 40 returned up through the casing I and out through the flow lines 3. The tubing may be then elevated or lowered and the washing continued until the well is washed clean. The tubing then may be lifted to elevate the ring I8 45 above the supports 21 and said supports may be moved inwardly byappropriate rotation of the stems 28 and the tubing then hung on said supports. The stems 22 may then be turned to project their inner ends 23 inwardly against the 50 sloping face 2! to lock the hanger in place and to compress the packing l1 to the end that the tubing can not be forced upwardly or blown out by internal pressure in the well.

While the tubing is being manipulated as above explained, a seal may be maintained about the lift nipple I50 above the valve casing l. Equipment for maintaining this seal; as illustrated,-

comprises a bowl 3| having an inside downwardly tapering seat 32 with a resilient pressure head 33 seated in said seat and closely surrounding the lift nipple lid. The lower end of the pressure head is formed with an annular groove 34 providing outside and inside annular lips 35 and 36 which flt closely against the seat 32 and the lift nipple I50 respectively to maintain fluid tight joints. .The pressure from beneath will enter the groove Bl so as, to force the outer lip outwardly and the inner lip inwardly to maintain tight seals. The upper end of the pressure head has a rigid cage I1 whose inside diameter is suflicient to allow the pipe couplings to pass therethrough and the pressure head will yield to permit such passage while the pipe is being manipulated as hereinabove explained. The bowl may be fastened to the upper end of the valve casing I by means of the bolts 38 and a tight seal formed between said bowl and easing by the gasket 39.

The pressure head 33 is maintained in place during the foregoing operations by means of a clamp ring 39 which is secured in place by means of the bolts ill and which abuts the upper end of the pressure head and a slip bowl ll may also-be secured in place above the clamp ring by means of saidbolts 40.

When the well has been washed and brought in the pressure head may be removed, if desired,

and the usual hook-up of flow connections made.,

Before the pressure head is removed, however, the lift nipple may be unscrewed from the hanger I4 and elevated to clear the valve II and said valve may be closed to make the permanent flow connections above.

The drawing and description disclose what is now considered to be a preferred form of the invention by way of illustration only, while the broad principle of the invention wil be defined by the appended claims. I

What we claim is: 1 1. A wellhead comprising a tubular casing head shaped to permit the passage of inner tubing therethrough, a tubular hanger in the head adapted to be coupled to, and to suspend, the

tubing, sealing means around the hanger, an upper, downwardly facing shoulder on the hanger abutting the sealing means, an inside supportmovable inwardly into position to engage the lower end of the sealing means to suport the hanger and tubing suspended therefrom to cause expansion of the sealing meansinto fluid tight relation with the casing head, means for moving the support outwardly to clear the sealing means to permit the hanger to pass downwardly below the support and inwardly to cause the sealing means to land on the support, a lift nipple attachable to and detachable from the upper end of the hanger, a valve on the casing head, a pressure head above the valve shaped to be automatically varied in inside diameter by the tubing and hanger to permit them to pass downwardly or upwardly therethrough and to continuously maintain a fluid tight seal thereabout, said pressure head being spaced a sufiicient distance above the valve to allow the detached lift nipple to be elevated into position to clear the valve to permit closing of the valve and at the same time maintain a fluid tight seal about the lift nipple whereby the well head may-be maintained closed against the escape of well pressure until the valve is closed. t

2. In combination a wellhead having an inside seat, sealing means on said seat shaped to surround an inner tubing through the head, a hanger adapted tO'be coupled into said tubing and of an outside diameter to fit snugly within the head beneath said seat, said sealing means being yieldable outwardly and Man inside diameter to 7 form a fluid tight seal about the tubing and about the hanger, an inside retractable support'beneath the sealing means, means for moving the support radially inwardly into position to engage

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