US1604580A - Casing head - Google Patents

Description

Parenteel oei. 2e, 192e.,

l rr @if GEORGE H. JAQUES, O CASPER, WYOMING.

oasmer Haan'.

Application filed September-25, 192.5. Serial No; 58,624.

The invention' relates to casingl heiad'sifoir oil wells and the like and has for its object' to provide Aa novel form of head associated with means for effectively packing the joint between' tbe head and the tubing and for anchoring the ,tubing to the casing head-to prevent relative movement between the casing and the enclosed tubing by anchoring the `tubing in the casing head in such manl() ing downward underits own weight, after it has been set, and also to prevent the well pressure raising the tubing.

The. invention isillustrated in theaccorn'- panyingdrawings, in which i Fig. 1 a sectional elevation of the head as applied tothe casing and tubing.

Fig. 2 is 'a -plan view of o ne of the .split` retaining rings for the packing.

Fig. 3 is a partial sectional .elevation of the slips.

Fig. 4 isI a plan view of the latter.

, Fig. 5 is a plan view of the anchor or re-l taining ring.

Referring to the drawings, 1 indicates the main or tubular body portion of the head, which is internally screw threaded at 2 to en.- gage the upper threaded end of the well casing C, within which latter is 'centered the string of well tubing l. The interior of the tubular body 1 is provided with' annular shoulders 3, 4 and 5, the first two shoulders being adapted to receive and support the lpacking means interposed betweentheinterior of the head and the exterior of the tubing. \The packing means aforesaid comprises 'a split packing 'retainingring 6 seat-i 111g on the shoulder 3, one or more packing rings 7 of suitable material, the lowermost of which is seated on shoulder 4 and the upper edge of the retaining ring 6, and an upper split ring 8 of metal or the like, by `means of which the packing is compressed and forced into intimate contact withthe interior wall of the head and the outer surface of the tubing.

Fitting in the upper enlarged bore of the tubular member 1 is a sleevel 10 having a tapered bore 11 and a shouldered lower rim 12 engaging the upper face of split ring 8 and serving to compressthe packing, when -the sleeve` 10 is forced downwardly in the tubular body portion 1.

Adjustably mounted in the tapered bore of the sleeve 10 'are slips 13 having oppositely tapered upper and lower peripheral ner asto prevent the string of tubing mov? outer faces 14 and 15 and opposite-ly serrated inner faces 16 `and 17, the teeth 16 being downwardly inclined and the teeth 17 up- "lwardly incl-ined. These slips 13 are prefer ably formed originally as a tubular member having its exterior turned to produce the opposite tapers, bored to fit the exterior of `the tubing and having oppositely inclined threads'turned in its interior, the tubular member thus fashioned being split into three equal parts by means of al thin parting tool, so that each of the slips is arcuate in horizontal' cross section and the three slips constitute tin annular series of wedges interposed between the tapered bore of the sleeve 10 and thetubing. y v

Secured in the upper end of the tubular member 1 is a series of studs or bolts 21 provided ontheir outer end with nuts`22, which bolts pass through holes 20 in an anchor ring 18, the inner 'periphery of which ring is provided with a downwardly flaring or tapering 'surface 19 cooperating with the up- 4 per tapered surface 14 of the slips 13.

The various parts are assembied as illustrated in Fig. 1 and, when the'nuts 22 are set up on the bolts or studs 21, the yanchor or retaining ring 18 is forced downward toward the'body portion 1, carrying with it the slips pered surfaces between the rings 18and the slips and between the'interior of the sleeve ,13 and the sleeve 1 0. The cooperating tacontaining the slips causes the teeth or serv rations ontheslips to bite into' the tubing T and lockthe latter securely to the body 1 of the head. At the same time, ,the downward movement of the sleeve 10 compresses the packing 17 and causes the latter to effectively seal the joint between the tubing and the head to preventl the escape of gaseous or liquid media at this point. The upwardly inclined teeth or serrations 17 prevent any\ downward movement of the tubing with re- ,spect'to the casing, so that, after the tubing.

hasbeen setv and 4the yslips tightened up, the

further downward movement of the casing is prevented. Similarly, the downwardly `inclined teeth or serrationslt lock theA packing against upward movement due to well `pressure and thereby obviates any possibility of blow outs. l

As thus constituted, it will be seen that lthe new casing-.head serves to support the weight of the anchored string of tubing within the casing, preyents the well pressure from raising the string and, at the saine time, eilects an absolutely duid tiglitipaclring between the tubing and the head,' thereby positively preventing" a blow out from any cause. The casing also obviates the necessity ot the application ot landing; clamps1 anchor clamps and all other supporting and retainingl devices usually employed in the application et the string,r oit tubingn in high pressure vvells and iirtl'ierinore renders it unnecessary tor' cutting landing nipples, since the tubing string may be landed and anchored in any desired position. lt will be further noted that this new type of packing head is relatively simple, compactu may bev manufactured at a small cost and when applied as shown, giieatlv conserves cellar space and leaves all Working parts for con- 'trol of the vvell accessible.

lWhile the invention has been villustrated and described with 1reference to the Well tubing T, it Will be understood that it is not restricted to use with such tubing, but is equally applicable to smaller size casing, when the latter is employed in connection with the outer casing. 1

uWhat l claim is:

l. A casing head comprisinga tubular member adapted to be secured to the Well casino and provided with a series oiu internal shoulders annular packing means supported by certain oit said shoulders7 an internally 'tapered sleeve fitting the tubular member and sevingA to compress 'the packing means, arcuate slips having. serrated inl ner faces and oppositely tapered upper and loiver peripheral outer races, the lower peripheral outer 'faces engaging the tapered sleeve, an anchor ring having a tapered.

openiinr engaging 'the upper peripheral faces inca-,eee

of the slips,4 and bolts engaging' the upper edge oit the tubular member for adjusting the anchor ring.

2'. A casing head comprising a tubular member adapted to be secured to the Well casing and provided with a series of internal shoulders, annular packing' means supported by certain ot said shoulders, an internally tapered sleeve fitting the tubular member and serving to compress the packing means, arcuate slips having oppositelv serrated inner faces to engage the Well tubing and oppositely tapered upper and lower peripheral outer faces, the lower peripheral outer faces engaging the tapered sleeve, an anchor ring;v having a tapered opening` engaging the upper peripheral faces of the slips, and bolts engaging the upper edge of the tubular member tor adjusting the ancnor ring.

.3. A casing head comprisinga tubular ineinber threaded to receive the upper end of a Well casing and having internal packing receivingshouldersa an internally tapered sleeve engaging the upper part oit the bore of said tubular member., arcuate slips having;`- serrated inner faces to engage the Well tubing; and oppositely tapered upper and lower peripheral outer faces, the lovvei' peripheral outer :taces eniigaginu1 the taperedsleeve, an anchor ring having a tapered opening cooperating with the upper peripheral 'faces of the slips,-bolts rounted in the 'upper end ot the tubular member and pass'- ing through openings in the anchor ring, and nuts on the bolts forcing thevanchor ring toward the tubular ineniber.

In testimony whereof ll affix my signature.

GERGE H. JAQUES.

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