US1933951A

US1933951A - Casing tester

Info

Publication number: US1933951A
Application number: US639364A
Authority: US
Inventors: Young Bob
Original assignee: Individual
Current assignee: Individual
Priority date: 1932-10-24
Filing date: 1932-10-24
Publication date: 1933-11-07
Anticipated expiration: 1950-11-07

Description

Patented Nov. 7, 1933 umTzn s -nrs V CASING TESTERj Bob Young, Sin-m s, Li. H Application October 24, l932. Serial No. 639,334 I 4 Claims. (oiled-+9) I This invention relates to a device for'testing the casings in wells and the like.

Eeretofore, in order to test a well casing, it has been the general practice to place a string 5 of casing sections and then pour a cement mixture thereinto so that it will set in the bottom portion of the well. Should a test reveal a leak in the casing the condition could be remedied only by lowering a casing of smaller diameter .:into the faulty casing. This has r sulted in a considerable loss of time and material and has increased. greatly the cost of the work. 7

An object of the present invention is to provide the lower section of the casing with an attachment which will allow the casing to be tested without cementing it. Should the test disclose a leak, the casing could be pulled easily,

the leak repaired and the casing again lowered" into the .well. It can then be cemented or sealed in the usual way without interference by the attachment.

With the foregoing and other objects in view which will appear as the description proceeds the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed being understood that changes in the precise embodiment of the invention herein disclosed may be made within the scope of what is claimed without departing from the spirit of the invention.

In the accompanying drawing the preferred form of the invention has been shown.'

In said drawing Figure 1 is a section through the lower end of a well casing with the present improvement attached and in open position, before being lowered within a well.

Figure 2 is a similar view showing the attachment closed by contact with the bottom of the well.

Figure 3 is a section on line 33, Figure 1. Referring to the figures by characters of reference, l designates a screw plug adapted to be joined by a coupling sleeve 2 to the lower end of a casing 3. A bore 4 is extended through the plug near its periphery.

The lower end of coupling sleeve 2 extends below the plug to form a guide as shown at 5 and slidable in this guide is a sealing head 6 adapted to bear tightly against the lower face or" plug 1 and provided with an annular shoulder 7 likewise adapted to bear against the lower end of coupling SIBBVB'Z. A bore 8, preferably inclined, is extended through the sealing head 6.

The plug 1 has a holding pin 9 extended downwardly therefrom within a bore 10 in the head tween plug 1 and said head through which communication is established between

bores

4 and 8, as shown in Figure 1. 5

In practice the testing attachment is' coupled to the lower section of the casing and said casing is then lowered into the well. During this operation the sealing head will, be supported as in Figure 1 closed against plug 1 by pressure 7 against liquid in the path thereof. Thus solids in the liquid will be kept out of the casing. When the bottom of the well is reached the sealing head will be brought to a stop and the weight of the casing will cause the plug 1 to bear 7 tightly upon the sealing head so as tocontinue to close all communication between

bores

4 and 8. The casing can then be tested in the usual way as by forcing fluid thereinto and should a leak be disclosedthe casing can be pulled, repaired and again lowered. When the casing is ready for cementing it is raised slightly so as to move the plug 1 away from seal head 6 and release the fluid in the casing so that it will join the outside fluid. The cementing fluid is then forced into the casing to expel the fluid in the path thereof and flow through the

bores

4 and 8 and thence upwardly around the lower 7 end of the casing.

After the foregoing operation the'cemen t will 0 set and the casing will then be ready for use.

It will be noted that pin 9 is not located at the center of the plug and sealing head. Thus it cooperates with the guide end 5 of sleeve 2 to prevent the sealing head from rotating. Consequently the bores 4am 8 can not move into register but will communicate only when the sealing head 6 and the plug l are spaced apart;

What is claimed is:

l. A testing attachment for a well casing ineluding accupling sleeve, a plug therein having a bore therethrough, a sealing head slidable in the sleeve and having a bore 'therethrough, said plug and head being movable together to close the bores and movable'apart to establish communication between thebores, and means extended longitudinally within the plug and head for limiting the relative movement of the head and plug.

2. A testingattachment for a well casing in- 1 cluding a coupling sleeve, a plug therein having a bore therethrough, a sealing head slidableeinw the sleeve and having a bore therethrough, said plug and head being movable togetherrto close" the bores and movable apart to establishcomfl munication between the bores, and means seated in the plug and head and parallel with thepathlz of movement of the head for limiting the relative movement of the head and plug and holding them against relative rotation.

4. A testing attachment for well casings including a coupling sleeve, a plug therein, a sealing head slidable in and extending below the sleeve and normally spaced from the plug by gravity, there being nonalining bores in the plug; andheadiadapted. to be closed by contact of the hea'd-withthe plug,- and a holding pin seatedain the head and plug and secured to the plug for limiting the relative sliding movement of= the head and plug, said pin being parallel withhut removed from the axis of the head for cooperation with the sleeve to hold the head against' rotation in the sleeve relative to the plu BOB YOUNG.