Deployment

Deployment

The Upwing Subsurface Compression System™ (SCS) is designed to be flexible for both standard tubing-hung geometry as well as alternative deployment methods.

SCS deployment by standard tubing-hung geometry and alternative deployment methods
SCS deployment by standard tubing-hung geometry and alternative deployment methods

Standard Tubing-hung Deployment

Like Electrical Submersible Pumps (ESPs), the SCS can be deployed by production tubing. The SCS assembly with the motor unit at the bottom, the bearing unit in the middle, and the compressor unit at the top is connected to the bottom of a production tubing. Sections of production tubing are threaded together end-to-end from the surface and hung at the wellhead, as indicated by the name “tubing-hung.” The power cable (represented by the red lines) from the motor unit is strapped to the production tubing by cable protectors and penetrates through the wellhead with pressure seals. The compressed gas will flow from the compressor through the production tubing to the surface.

Alternative Deployment

The SCS has also been designed with alternative deployment in mind. There are several alternative deployment schemes for an SCS or an ESP.

Coiled tubing with external power cable is very similar to the standard tubing-hung geometry, except that sections of the production tubing are replaced by a single and continuous coiled tubing. The gas will be produced through the coiled tubing.

Deployment by coiled tubing with an internal power cable will require the SCS to be inverted with the compressor unit at the bottom and the motor unit at the top. The power cable from the motor unit will be located inside the coiled tubing. The weight of the SCS will be supported by the coiled tubing at the wellhead. There will need to be a seal (e.g. packer) to isolate the annulus between the intake of the compressor and the casing to prevent the recirculation of compressed gas. The produced gas will be transported through the annulus to the surface.

Deployment can be done by two spools of cables. A shroud with a packer at the bottom will be used to guide the gas flow on the side of the SCS to the intake of the compressor. A mechanical cable will support the weight of the SCS and power cable from the wellhead. A power cable is strapped to the mechanical cable.

Single cable deployment is very similar to the deployment by coiled tubing with an internal power cable. The single cable will provide both the mechanical integrity and the electrical power from the surface. The deployed SCS also needs to be inverted.

The slick line deployment is composed of a permanent completion section and a retrievable string. The power cable is fixed on the outside of the liner, which is part of the permanent completion. There is an electrical wet-mate connection at the end of the power cable to connect with another wet-mate connection on the retrievable string. The retrievable string can be deployed by a slickline into the well at the predetermined position, where the two wet-mate connections mate up. The electrical power is feed from the surface through the power cable and wet-mate connections to the motor unit of the retrievable string.