US 3367422 A
Description (OCR text may contain errors)
Feb. 6, 1968 D. L. SIMS BUMPER SUB POSITION INDICATOR Filed Feb. 25, 1966 04225 L. SIMS l I N VEN '1 OR. I BYW J 5M lllllflillll lllll fi ua a 6 A TTORNE Y5 United States Patent Oflice Patented Feb. 6, 1968 3,367,422 BUMPER SUB POSITION INDICATOR Darrell L. Sims, Houston, Tex., assiguor, by mesne assignments, to the United States of America as represented by the National Science Foundation Filed Feb. 25, 1966, Ser. No. 530,178 3 Claims. (Cl. 166-187) This invention relates generally to apparatus for providing a surface indication when the two telescoping sections of a bumper sub located in a string of drill pipe are in a preselected position relative to each other. In particular, this invention relates to apparatus that provides such surface indication with a pressure signal transmitted to the surface through the drilling fluid being circulated through the pipe string.
It is often desirable to know when a bumper sub in a pipe string is in a preselected position. For example, when the sub is being used to control the weight on a b1t, it is desirable to know when the sub is closed. By closed it is is meant that the two telescoping sections of the sub have telescoped the full extent for which the sub is designed and any further lowering of the pipe string will increase the Weight on the bit. Conversely, it may be desirable on occasions to know when the sub is fully open, i.e., when the two telescoping sections have moved apart to the extent allowed. Knowing this, the driller can lower the pipe string to prevent the weight on the bit from decreasing as the bit continues to drill.
Therefore, it is an object of this invention to provide novel apparatus for producing a surface detectable pressure signal in the drilling fluid being circulated in a string of drill pipe when a bumper sub in the string is in a preselected position.
It is another object of this invention to provide apparatus for producing a surface detectable pressure signal in the drilling fluid being circulated in a string of drill pipe when a bumper sub in the string is in a preselected position, said signal producing apparatus being controlled directly by the bumper sub.
It is yet another object of this invention to provide such apparatus that is simple in construction and positive in operation.
These and other objects, advantages, and features of this invention will be apparent to those skilled in the art from a consideration of this specification and attached drawings.
A preferred embodiment of the invention will now be described in detail in connection with the attached drawings in which,
FIGURE 1 is a vertical sectional view through a bumper sub equipped with the signal producing apparatus of this invention when the bumper sub is not in the preselected position;
FIGURE 2 is a vertical sectional view of such apparatus when the bumper sub is in the preselected position; and
FIGURE 3 is an alternate arrangement of a portion of the apparatus for producing a signal when the sub is in another preselected position.
Bumper sub in FIGURE 1 has two telescoping sections. The first telescoping section includes mandrel 12 and upper connector sub 13. The upper sub connects the first telescoping section to the portion of drill string above the bumper sub.
The other telescoping section of the bumper sub includes tubular member 11, within which mandrel 12 is located, and lower connector sub 14. Cap 15, attached to the upper end of member 11, provides a downwardly facing annular shoulder 16 to engage upwardly facing shoulder 17 on the mandrel and limit the downward travel of the second telescoping section relative to the first. Lower sub 14 provides an upwardly facing annular shoulder 18 to engage lower end 12a of mandrel 12 and limit the downward travel of the first telescoping member relative to the second one. When end 12a of mandrel 12 is in engagement with annular surface 18 on the lower connector sub, the bumper sub is closed and the weight of the tubular string above the bumper sub can be transmitted to the bit or whatever is connected to the drilling string below the bumper sub. Conversely, when the two interengaging shoulders 16 and 17 are in engagement, the bumper sub is fully open and some or all of the weight of the drilling string below the bumper sub can be carried by the upper string.
Connected into the drill string below the bumper sub is the apparatus of this invention, generally indicated by the number 20. It includes tubular body 21, which is connected directly to the lower end of bottom sub 14 of the bumper sub, so the drilling fluid flowing through the drill string will pass through the bore of the body. Located in the bore of the body is sleeve 22. The sleeve is made of flexible material preferably an elastomer, such as rubber. Means are provided for holding upstream end 22a of the sleeve open and against movement downstream with the drilling fluid to cause the drilling fluid to flow through the sleeve as it travels through the bore of the body. In the embodiment shown, the upper end of the sleeve is bonded to annular ring 23 which rests on an upwardly facing annular shoulder 24 formed in the bore of the body by increasing the diameter of the bore above that point. The annular ring is provided with seal 25 which engages the enlarged bore of the body and provides a seal between the upper end of the sleeve and the body. This insures that all of the drilling fluid that passes through the body, also passes through the sleeve. Lower end 22b of the sleeve is bonded to annular ring 26 to hold the lower end of the sleeve open. Seal 27 carried by ring 26 provides a seal between the lower end of the sleeve and the body.
Means actuated by one of the telescoping sections of the bumper sub are provided to collapse sleeve 22 to restrict the flow of drilling fluid through the bore of body 21 and create a pressure signal in the drilling fluid that is detectable at the surface. In the embodiment shown, such means are arranged to collapse the sleeve when the bumper sub is closed. Annular piston 28 is located in upper section 21a of body 21. This section of the body has a bore of increased diameter which combines with depending sleeve 30 of annular piston 28 to form an annular chamber 31 between piston 28 and upwardly facing annular shoulder 32. Seals 33 and 34 are carried by the piston and the sleeve, respectively, to prevent the escape of fluid from chamber 31. The chamber is connected to the bore of body 21, intermediate the ends of sleeve 22, by passageway 35.
Thus, by filling chamber 31 with a fluid, preferably a liquid, downward travel of piston 33 will force the Hard through passageway 35 into the bore of body 21 behind sleeve 22. The fluid will collapse the sleeve, as shown in FIGURE 2, and restrict the flow of drilling fluid and create a surface detectable pressure signal therein. To cause this to occur when the bumper sub is closed, tubular extension member 29 is mounted on piston 28 and extends upward into tubular member 11. The extension member is long enough to be engaged by end 12a of mandrel 12 and force piston 28 downward to collapse the sleeve, when the bumper sub is closing. If the drill string is raised to open the bumper sub the sleeve will force the fluid behind it back through passageway 35 into chamber 32 and open up the bore through the body to the fullest extent possible.
This same apparatus can be employed to indicate when the bumper sub is open by simply reversing the action of the piston in the fluid chamber, as shown in FIGURE 3. In this embodiment, the bore of body 35 is provided with a section 35a of increased internal diameter to provide a downwardly facing annular shoulder 36. Annular piston 37 is slidably mounted in bore section 35a of body 35 for movement upward relative thereto. Sleeve 38 is integrally attached to the piston to combine with the piston and the bore of the body to form annular fluid chamber 40. The sleeve is connected to tubular extension member 39 which is connected to mandrel 12. Thus, upward movement of the mandrel will displace the fluid from fluid chamber 40, through passageway 41, and collapse a sleeve (not shown) in the manner described above.
From the foregoing, it will be seen that this invention is one well adapted to attain all of the ends and objects hereinabove set forth, together with other advantages which are obvious and which are inherent to the apparatus and structure.
It will be understood that certain features and subcombinations are of utility and may be employed without reference to other features and subcombinations. This is contemplated by and is within the scope of the claims.
As many possible embodiments may be made of the invention without departing from the scope thereof, it is to be understood that all matter herein set forth or shown in the accompanying drawings is to be interpreted as illustrative and not in a limiting sense.
The invention having been described, what is claimed is:
1. Apparatus for indicating at the surface when the two telescoping sections of a bumper sub, located in a string of drill pipe through which drilling fluid is being pumped, are in a preselected position relative to each other, said apparatus comprising, a tubular body adapted to be connected in a pipe string to one of the telescoping sections of a bumper sub, said body having a passageway therethrough for the passage of drilling fluid, a sleeve of flexible material located in the passageway, means for holding the upstream end of the sleeve open and against movement downstream with the drilling fluid to cause drilling fluid flowing through the opening in the body to flow through the sleeve, means for providing a seal between the ends of the flexible sleeve and the body,
a fluid chamber, a passageway connecting the chamber to the opening in the body intermediate the ends of the sleeve, and means actuated by the other telescoping section for forcing the fluid in the chamber into the opening to collapse the sleeve and restrict the flow of drilling fluid therethrough to produce a pressure signal, in the drilling fluid when the two telescoping sections of the bumper sub are in the preselectedv position.
2. The apparatus of claim 1 in which the fluid chamber comprises a section of increased diameter in the opening through the body and an annular piston member movable axially in said opening, said piston being moved axially to force fluid out of the chamber and collapse the sleeve by said other telescoping section of such bumper sub.
3. The apparatus of claim 1 in which the downstream end of the sleeve is free to move axially of the opening.
References Cited UNITED STATES PATENTS 3,227,462 1/1966 Tamplen 166-187 3,283,823 11/1966 Warrington 175-243 3,322,215 5/1967 Warrington 175--243 3,338,310 8/1967 McGill 166187 JAMES A. LEPPINK, Primary Examiner.