Sidetracking, Casing Window Milling, and Rathole Drilling

Sidetracking, casing window milling and rathole drilling

Sidetracking is a high-precision well intervention technique that restores or significantly enhances well productivity without the need to drill a new wellbore. SPC “Technology” offers integrated services for sidetracking, including casing window milling, rathole drilling, and full engineering support throughout the subsequent operations required to drill the new sidetrack.

Casing Window Milling

Using advanced whipstocks equipped with either mechanical or hydraulic anchors, along with precision-engineered milling tools, we ensure accurate, safe, and efficient window milling in production casing.  Our solutions are fully adaptable to directional and horizontal wells - even under complex downhole conditions.

Rathole Drilling

Window milling is followed by drilling a rathole - a cavity beyond the casing window - to establish a stable kickoff point for the new sidetrack. This operation employs a custom-selected mill tailored to the specific geological conditions of the well.

We drill the new lateral with a precisely controlled trajectory, designed to bypass problematic intervals and drilling-in new productive formations. This technology is especially effective in cases of:
- Flooding of the main wellbore
- Mechanical damage to the drill string
- Reservoir depletion
- The need to re-enter previously undeveloped formations

Technical Advantages:

• Use of high-precision whipstocks and mills manufactured in-house
• Round-the-clock engineering support (24/7)
• Operations are performed in vertical, directional, and horizontal wells
• Integrated support for drilling, workover, and wireline operations

Results:

• Increased production rates
• Significant reduction in costs compared to drilling new wells
• Extended well life
• Enhanced oil and gas recovery factor

Integrated Services

Sidetracking, casing window milling, and rathole drilling