This paper presents a case history of technology applied to perform multiple ffac-pack treatments in three deviated water- source wells in Central Thailand. Each of the three wells had been sidetracked from its original completion because of previous production problems. The multiple target zones in these wells were soft, high-permeability, unconsolidated sandstones that lacked barriers for fracture containment. Given these conditions, ffac-pack completions were designed and implemented. Frac- pack treatments are small hydraulic fractures designed for relatively short fracture lengths and high conductivity. The ffac-pack treatments, which minimize the effects of near-wellbore damage, are generally followed by the placement of a conventional gravel- pack to ensure that sand production does not occur. This type of completion technology, relatively new to the Asia-Pacific region, should be considered in areas where conventional sandstone acidizing and gravel-packing operations have yielded unsatisfactory results.

Technology and operational considerations for this type of completion scheme were as follows:

  • possibility of multiple hydraulic fractures resulting from long perforated intervals in the deviated wellbores

  • application of sand slugs to reduce/eliminate excessive near-wellbore friction pressures

  • on-site minifrac analyses performed immediately before each frac-pack to optimize the main treatment design

  • placement of sand plugs for zonal isolation in lieu of mechanical, drillable bridge plugs to reduce rig time while the treatments were performed

This paper presents the technology applied to address each of the previous considerations and water production results to date for each of the three wells.

You can access this article if you purchase or spend a download.