In contrast to a standard anchor, the Don-Nan slimhole tubing anchor can be deployed at any point in the well in relation to the perforations. The improved design also minimizes solids buildup in the anchor, and the smaller OD improves gas flow past the anchor.
The ability to run the Don-Nan slimhole tubing anchor below perforations enables operators to pump from the point in the well that maximizes oil production and minimizes gas interference. The tubing can be anchored at the deepest point in the string, eliminating the need for tubing below the anchor. This placement reduces downhole assembly wear and tubing fatigue caused by tubing movement. In addition, tapered connections prevent anchor seizure by diverting solids that might otherwise accumulate in the anchor.
Alternatively, if the Don-Nan slimhole tubing anchor is placed above perforations, its design provides the benefit of increasing the width of the annulus between the OD of the anchor and the ID of the casing. The smaller OD of the Don-Nan slimhole tubing anchor also increases gas flow past the anchor into the casing or tubing annulus, thereby reducing gas interference in the pump.