Cement Evaluation While Drilling Saves 4 Days and USD 340,000 | Schlumberger
Case Study
Location
Middle East, Kuwait, Asia, Onshore
Details
SonicScope multipole sonic-while-drilling service verified cement quality while reducing wireline costs and saving 4 days of rig time.
Products Used

Cement Evaluation While Drilling Saves 4 Days and USD 340,000

Cement bond log alternative improves well construction efficiency in Kuwait

Ensure cement bond before completion

To optimize gas production from the Raudhatain Field’s tight carbonate reservoirs, Kuwait Oil Company (KOC) was preparing for a multistage, horizontal well completion. As part of its completions process, the operator needed to evaluate cement bond quality and ensure the integrity of the 75/8-in liner in the zone of interest before drilling out the shoe.

Convey cement bond logging tools using drillpipe

The inclination angle of the 7 5/8-in liner reached up to 90°—preventing conventional wireline logging tools from reaching the desired depth. In previous high-deviation wells, KOC acquired the cement bond log by using drillpipe to move the required wireline logging tools. While necessary to ensure the success of the planned completion, pipe-conveyed logging operations add time and costs to the project.

Conduct efficient cement evaluation

Schlumberger proposed using the cement evaluation component of the SonicScope multipole sonic-while-drilling service, which verifies cement quality without the additional runs and rig time of conventional cement bond logging tools. The SonicScope service uses both the amplitude of the casing arrival and its attenuation rate across the receiver array to derive a quantitative bond index (QBI) measurement equivalent to a conventional cement bond log.

Saved 4 days and USD 340,000

KOC ran the SonicScope service for a total of 500 ft within the 75/8-in liner, successfully acquiring the high-quality waveform from monopole high frequency needed to compute the QBI. By conducting cement evaluation while drilling, the operator eliminated the need for a separate cement bond log run. As a result, KOC cut wireline costs and 4 days of rig time, saving USD 340,000.

The quantitative bond index log confirmed good-to-moderate cement quality in the 7 5/8-in liner.
The quantitative bond index log confirmed good-to-moderate cement quality in the 7 5/8-in liner.
Products Used

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