# US 2014/0196881 A1 · Apparatus for Connecting A Rotating Drive Rod String To A Downhole Assembly

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- Number: US 2014/0196881 A1
- Document ID: US20140196881A1
- Status: Published application
- Kind: A1
- Application number: 14/153,421
- Filed: 2014-01-13
- Published: 2014-07-17
- Earliest claimed: 2013-01-14
- Inventors: William Bruce Morrow
- Web page: https://patentgrep.com/patent/US20140196881A1

## CPC

- E21B 43/126: {Adaptations of down-hole pump systems powered by drives outside the borehole, e.g. by a rotary or oscillating drive (powered by fluid E21B43/129)}
- E21B 17/02: Couplings; joints {(expandable couplings or joints E21B43/106)}
- E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS

## Abstract

A system for connecting and disconnecting a rod string from a downhole assembly in which a captured spline assembly is encased in a receiver attached to the downhole assembly and an on-off tool separating the rod string from the downhole assembly.

## Claims

### Claim 1

In a well for the capture of subterranean fluids in which a power supply located at the surface of the well drives a downhole assembly for pumping the fluid in the well to the surface through a captured spline assembly,
a rod string depending from, and connected with, the power supply and engaged with the downhole assembly;
a system for the connection and release of said rod string from said downhole assembly, said downhole assembly having a receiver, said receiver standing upwardly therefrom, said receiver encasing a captured spline assembly to provide a torsional connection thereto.

### Claim 2 (depends on 1)

The system of claim 1, wherein said captured spline assembly being mounted in bearings within said receiver to thereby permit rotation of said captured spline assembly.

### Claim 3 (depends on 1)

The system of claim 1, wherein said captured spline assembly includes a stab-in rod;
a receptacle, said receptacle receiving said stab-in rod in rotational driving relation;
said receptacle directing rotational power to said downhole assembly;
said stab-in rod connected with said rod string for rotating said stab-in rod.

### Claim 4

In a well for the capture of subterranean fluids in which a power supply located at the surface of the well dries a downhole assembly for pumping the fluid in the well to the surface,
a rod string depending from, and connected with, the power supply and engaged with the downhole assembly;
a system for the connection and release of a rod string from a downhole assembly, said downhole assembly having a receiver, said receiver standing upwardly therefrom, said receiver housing a captured spline assembly;
an on-off tool mounted in said rod string, said on-off tool being selectively separable to disengage said captured spline assembly from said power supply as needed.

### Claim 5 (depends on 1)

The system of claim 1, wherein said receiver having an opening at the free end thereof, a cap, said cap covering said opening.

### Claim 6 (depends on 5)

The system of claim 5, wherein an aperture in said cap, an extension shaft connected to said stab-in rod and passing through said aperture to connected with said drive string.

### Claim 7 (depends on 3)

The system of claim 3, wherein said captured spline assembly being mounted in bearings within said receiver to thereby permit rotation of said captured spline assembly.

### Claim 8 (depends on 5)

The system of claim 5, in which a power supply located at the surface of the well dries a downhole assembly for pumping the fluid in the well to the surface,
a rod string depending from, and connected with, the power supply and engaged with the downhole assembly;
a system for the connection and release of a rod string from a downhole assembly, said downhole assembly having a receiver, said receiver standing upwardly therefrom, said receiver housing a captured spline assembly;
an on-off tool mounted in said rod string, said on-off tool being selectively separable to disengage said captured spline assembly from said power supply as needed.

### Claim 9 (depends on 6)

The system of claim 6, in which a power supply located at the surface of the well dries a downhole assembly for pumping the fluid in the well to the surface,
a rod string depending from, and connected with, the power supply and engaged with the downhole assembly;
a system for the connection and release of a rod string from a downhole assembly, said downhole assembly having a receiver, said receiver standing upwardly therefrom, said receiver housing a captured spline assembly;
an on-off tool mounted in said rod string, said on-off tool being selectively separable to disengage said captured spline assembly from said power supply as needed.