PRODUCT

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Whipstock System

The Retrievable Whipstock is designed to provide necessary deviation of window mills and reamer mills from the axis of main wellbore while cutting “window” in production casing. It is also used for deviation of cutting and drilling tools while drilling additional borehole in the well. The Whipstock is used with bottom-hole support (cement plug or packer plug). To trip, set and cut “window” in casing in a single trip Retrievable Whipstock is used with Starting-Window Mill and Watermelon Mill. After finishing “window” cutting operation Whipstock may be retrieved from the well by Fishing Hook or Die Collar.

Classification:

Well Intervention Tools

Inquiry

Detailed Description

APPLICATION

WORKING PRINCIPLE

The whipstock is anchored to a downhole support (cement plug or packer plug) via hydraulic or mechanical mechanisms , with its inclined surface set at a predetermined angle (typically 3°–4° ) relative to the wellbore axis. When the window mill initiates casing cutting along this incline, the drilling string is deflected under axial pressure along the whipstock’s preset direction, forming a window that conforms to the designed trajectory.

FEATURES AND BENEFITS

1. Single-Trip Operation System

Integrated Tool String : Combines the whipstock, starting-window mill, and watermelon mill for single-trip deployment , completing anchoring, window cutting, and window smoothing in one run. Reduces tripping frequency and cuts non-productive time (NPT) by 25% .
Window Quality Assurance : The watermelon mill’s spiral blade design removes casing burrs effectively, enhancing window smoothness by 40% and reducing resistance for subsequent tool passage.

2. High-Reliability Anchoring & Retrieval Mechanism

Versatile Anchoring : Compatible with mechanical slips or hydraulic setting systems. Supports downhole anchors including cement plugs (pressure rating ≥15 MPa ), packer plugs, or pre-set nipples.
Zero-Residue Design : Ensures 100% retrieval of the whipstock body via fishing hooks or die collars, eliminating downhole metal contamination—especially critical for sour gas wells (H₂S partial pressure >0.3 kPa ).

3. Advanced Material & Manufacturing. AISI 4145H Chrome-Molybdenum Steel : Quenched and tempered to achieve yield strength ≥758 MPa. Copper-plated surface reduces friction coefficient by 30% .

4. Significant Economic Benefits

High Reusability : A single tool supports ≥5 window-cutting operations , reducing tooling costs by 60% compared to fixed whipstocks.
Efficiency Optimization : Automated directional systems compress window-cutting time to 8–12 hours, 3 times faster than conventional processes.