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• Mikhaelrams Rams

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Figure 5

CHAMBER INSTALLATIONS A chamber installation can greatly increase production rates, especially in wells with low bottomhole pressures and high productivity indexes. It is used in intermittent lift operations to increase the volume of fluids in the wellbore prior to lifting, without significantly increasing the backpressure on the formation. One type of chamber installation consists of a lower packer and an upper, or bypass packer. This twopacker chamber installation works as follows:

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As the chamber fills with fluid, gas in the chamber passes through a bleed valve into the tubing. When the chamber is filled, a slug of gas is injected down the annulus to open the operating valve.

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The gas in the chamber forces the fluid to enter the tubing through a perforated nipple above the bottom packer (Figure 6: Chamber installation—fluid entry).

Figure 6  

When all the fluid in the chamber above the nipple is forced into the tubing, gas follows behind the slug and forces it to the surface (Figure 7: Chamber installation—fluid displacement).

Figure 7  

The operating valve should close when the slug reaches the surface, at which time the filling cycle begins again.

In wells where it is not feasible to set two packers, an insert chamber installation may be used, in which the chamber is formed by a larger-diameter section of pipe at the bottom of the tubing string. The principles of operation are the same as for the two-packer installation. Alternative configurations may be designed for special circumstances.

SLIM HOLE INSTALLATIONS