Slickline Hydraulic Jar

Description

Slickline Hydraulic Jar

Technical Description and Specifications

The Slickline Hydraulic Jar is a precision-engineered tool designed to deliver a massive, controlled upward impact to a stuck tool string or to shear pins downhole. Unlike a mechanical or spring jar, which relies on manual speed or fixed latch settings, the Hydraulic Jar uses a fluid-metering system to create a time-delayed release, allowing for maximum energy accumulation in the wireline.

Key Technical Specifications and Operation

• Function: To provide a high-force upward impact that is fully adjustable based on the amount of tension pulled by the operator. It is the industry standard for fishing operations and pulling heavy-duty plugs.

• Mechanism: The tool contains a hydraulic chamber filled with high-viscosity oil. As tension is applied, a piston is pulled through a restricted orifice (the metering phase). This creates a time delay (typically 30 to 90 seconds) that allows the operator to stretch the wireline to the desired tension.

• The “Trip” Action: Once the piston reaches the bypass section of the cylinder, the oil resistance vanishes instantly. The stored energy in the stretched wireline snaps the mandrel upward at high velocity, striking the internal anvil.

• Variable Impact Force: The intensity of the blow is directly proportional to the tension applied at the surface. This allows the operator to deliver a “light” tap or a “heavy” blow ($E_k = \frac{1}{2}mv^2$) without retrieving the tool string to change settings.

• Automatic Reset: Simply slacking off the wireline allows the piston to return to the bottom of the stroke. A check valve within the piston allows the oil to move freely during the reset, making the tool ready for the next cycle immediately.

Customization and Materials

• High-Temperature Design: Standard units are rated for $350°\text{F}$, but custom HPHT versions are available with specialized seals and synthetic oils for environments exceeding $450°\text{F}$.

• Service Fluid: Available with different oil viscosities to adjust the “delay time” based on average wellbore temperatures.

• Material: Typically constructed from 4140/4142 alloy steel; NACE MR0175 compliant materials are available for $\text{H}_2\text{S}$ environments to protect the polished mandrel from hydrogen embrittlement.

Critical Parameters

SEO Keywords (Targeted for Slickline Procurement)

• Primary: Slickline Hydraulic Jar, Wireline Hydraulic Jar, Delayed Impact Jar, High-Force Pulling Tool.

• Secondary: Fluid Metering Jar, Slickline Fishing Jar, Adjustable Impact Tool, BHA Hydraulic Sub.