OHSA OPEN HOLE STAND-ALONE SCREEN SYSTEM

In certain applications, a stand- alone screen placed in an open hole provides a simple and effective sand control completion in unconsolidated formations. To maximize longevity and success, stand-alone screen completion should only be applied in clean, homogeneous sand stones with large well-sorted sand grains. The screen must be capable of filtering the larger formation sand [articles and promote establishment of permeable natural gravel pack, and in addition, the screen must be with maximum inflow area. If it is necessary, zonal isolation for water shutoff or other staged interventions may be achieved by using water or oil swelling packer in the open hole in conjunction with screens.

Kelly OHSA system is one sort of this stand-alone screen technology, which can be installation in one trip. When run into the open hole section, the system has the ability to wash down during running. If zonal isolation is necessary, the stand-alone screen assembly can be conjunction with several swell packers, which can also be mounted with seal bores below and above, thereby it is available to selective producing or controlling water if inserting seal assembly into seal bore at later stage.

Running

Prior to placing screens down hole, the well should be displaced to a clear fluid or highly conditioned mud to minimize the amount of solid particles that could lead to screen plugging.

The screens assembly will be made up on surface, and the service tool be run inside of the screens, which can make sure circulation from the bottom of the assembly. the RHS packer will connect screen assembly and service tools and run in well. Typically, the screen is deployed under a rota-table locked RHS Packer. The rotational lock feature allows rotation of the screen assembly in the event it becomes stuck during run-in. An “APB” antihydraulic locked seal bore and “DFS” will be incorporated bottom of the screen assembly to provide circulation out the end of the screens to assist in running the screens to designing position and spotting filter cake breaker into the open hole.

Circulation and setting packer

After running the assembly into the designing position, hold the assembly upward situation and circulation brine to displace the mud out of the hole, and pump into filter breaker, finally circulate the filter breaker out and set the top packer according the setting procedure.

Feature

• Installation in one trip

• Can be able to wash down while running when face the tight joints

• Mounted seal bores below and above swell packer and inserted seal assembly, it will be achieved to selective produce, control water or other interventions.

• Field-proved that the technology is more effective and economical for some certain of unconsolidated formation.

• HST Hydraulic Setting Tool prevent the RHS packer from premature setting

Associated Tools

• RHS Recoverable Hydraulic setting hanger packer

• QC Quick Connection Joint

• SWP Swell Packer

• APB Anti-hydraulic lock seal bore

• DFS Flow Shoe

• LSA Lower Seal Assembly