Unconventional/complex reservoirs

Integrated Technique Provides Effective Water Diagnostics in Tight Sand

This study describes a technique combining borehole acoustic reflection imaging with production logging in a horizontal well experiencing high water cut with the aim of enabling a mitigation plan.

The E-probe measures water holdup.
Fig. 1—The E-probe measures water holdup.
Source: URTeC 3864145.

The Triassic Chang 8 tight sand reservoir in the Xifeng block of the Ordos Basin features low permeability, which means that hydraulic fracturing and subsequent waterflooding were performed during its development phase. Water breakthrough was encountered after a short period of oil production. A solution of borehole acoustic reflection imaging combined with production logging was proposed in a horizontal well suffering from high water cut. The objective was to determine which stages contributed most to water production, understand the cause, and, ultimately, create a water shutoff plan.


The Ordos Basin, with an area of approximately 2.5×105 km2, is in North China.

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