Description
Controlled Upward & Downward Jarring for Stuck Drill String Recovery
The QY Full Hydraulic Drilling Jar is a double-acting downhole jarring tool designed to deliver controlled upward or downward release action when the drill string becomes stuck. Its hydraulic delay-release system, sealed oil-bath core mechanism and surface-controlled operating force make it suitable for conventional, deviated and extended-reach wells with operating temperatures up to 160°C.
Up & Down Jarring
Up to 160°C
REG / NC Connections
Quick Answer: What Is the QY Full Hydraulic Drilling Jar?
The QY Full Hydraulic Drilling Jar is an integral double-acting jar installed in the drill string to provide a controlled jarring option if the bottomhole assembly or drill string becomes stuck. By applying surface tension for upward jarring or controlled compression for downward jarring, the hydraulic release mechanism stores and releases energy after a delay. The release force can be adjusted through surface loading within the ordered tool limits, allowing the driller to respond to changing downhole conditions without relying on external torque adjustment.
Product Highlights
Double-Acting Jarring
Provides both upward and downward jarring capability so the operator can respond to different stuck-string conditions.
Hydraulic Delay Release
A hydraulic delay-release system enables controlled activation after the required surface load is applied.
Surface-Adjustable Operating Force
The operating force of the hydraulic release mechanism can be managed from surface within the selected model limits.
Oil-Bath Protected Core
The core mechanism uses a sealed oil-bath design to reduce wear on moving components and support service life.
Low-Resistance Release Flow Path
An enlarged hydraulic release flow area reduces operating resistance and supports a more effective release event.
Fast Reset for Repeated Jarring
After the mandrel returns to the center position, the tool can be prepared for another jarring cycle in either direction.
How the QY Hydraulic Drilling Jar Works
The QY jar is run as part of the drill string and remains available during drilling. If the string becomes stuck, the operator applies controlled axial loading from surface. For an upward jarring cycle, tension is increased until the hydraulic release mechanism reaches its release condition; for a downward cycle, controlled compression is applied in the opposite direction. The hydraulic delay allows load to build before release, producing the rapid relative movement required for the jarring event.
The operating force is controlled by the surface load applied to the tool and should remain within the limits of the selected QY model. After a jarring cycle, the mandrel is returned toward its neutral position so the jar can reset and repeat the operation. This two-direction capability gives the drilling team flexibility when the preferred release direction changes with the stuck condition.
Where This Hydraulic Drilling Jar Fits in the Drilling Program
A double-acting jarring option for standard drill-string programs where stuck-pipe contingency is required.
Suitable for directional well profiles where changing drag and contact conditions increase the value of an available jarring tool.
Applicable to extended-reach drilling programs within the tool’s load, connection and temperature limits.
The standard QY series is specified for downhole temperatures not exceeding 160°C.
QY Full Hydraulic Drilling Jar Technical Specifications
Select the model by matching tool OD and ID, drill-string connection, tensile and torsional capacity, required release force and temperature. The table below converts the supplied QY-series datasheet into searchable technical data for procurement and engineering review.
| Model | OD (mm) | ID (mm) | Working Temp. (°C) | Tensile Strength (kN) | Torsional Strength (kN·m) | Upward Release Force (kN) | Downward Release Force (kN) | Up/Down Jarring Stroke | Total Stroke | Connection |
|---|---|---|---|---|---|---|---|---|---|---|
| QY79 | 80 | 25 | 160 | 600 | 6 | 150 | 60 | 10 7/16 in (265 mm) | 20 7/8 in (530 mm) | 2 3/8 REG / NC23 |
| QY89 | 90 | 32 | 160 | 750 | 7 | 180 | 90 | 10 7/16 in (265 mm) | 20 7/8 in (530 mm) | 2 7/8 REG / NC26 |
| QY95 | 96 | 32 | 160 | 1000 | 8 | 200 | 100 | 10 7/16 in (265 mm) | 20 7/8 in (530 mm) | 2 7/8 REG / NC26 |
| QY108 | 109 | 38 | 160 | 1350 | 16 | 250 | 120 | 10 7/16 in (265 mm) | 20 7/8 in (530 mm) | NC31 |
| QY121 | 122 | 50 | 160 | 1950 | 25 | 350 | 180 | 10 7/16 in (265 mm) | 20 7/8 in (530 mm) | NC35 / NC38 |
| QY165 | 167 | 57 (70) | 160 | 3750 | 70 | 700 | 350 | 12 1/2 in (317.5 mm) | 25 in (635 mm) | NC50 |
| QY178 | 181 | 70 | 160 | 4650 | 80 | 800 | 400 | 12 1/2 in (317.5 mm) | 25 in (635 mm) | NC50 |
| QY203 | 206 | 76 | 160 | 6030 | 135 | 1000 | 500 | 12 1/2 in (317.5 mm) | 25 in (635 mm) | 6 5/8 REG |
| QY241 | 244 | 76 | 160 | 8500 | 165 | 1250 | 650 | 12 1/2 in (317.5 mm) | 25 in (635 mm) | 7 5/8 REG |
Engineering note: allowable operating loads and the final connection configuration are governed by the ordered model and approved project datasheet. Do not use tensile or torsional strength values as a substitute for the operating limits specified for the complete BHA.
How to Select the Right QY Hydraulic Drilling Jar Model
Start with the BHA envelope and required internal flow passage. The QY range covers 80–244 mm OD with model-specific IDs.
Choose the QY model that matches the required REG or NC connection and the surrounding drill-string components.
Review tensile and torsional strength together with the planned drilling loads and the limits of the complete assembly.
The required jarring direction and surface load window should be matched to the selected model’s release-force range.
The standard QY series is intended for applications not exceeding 160°C. Higher-temperature programs should use a dedicated high-temperature jar configuration.
Jar placement, neighboring tools, neutral-point behavior, drilling loads and the anticipated stuck mechanism should be reviewed as one system.
Why Choose a Full Hydraulic Double-Acting Jar?
A full hydraulic jar is appropriate when the drilling program requires a controllable jarring response without relying only on a mechanically preset release mechanism. The QY design allows the operating force to be managed through surface axial loading, giving the driller more flexibility to adapt the release event to actual downhole conditions.
The double-acting configuration also reduces dependence on a single jarring direction. If the stuck condition or BHA response makes upward jarring ineffective, the operator retains a downward jarring option within the tool limits. For drilling programs that prioritize a purely mechanical release system, a dedicated mechanical drilling jar should be evaluated separately rather than treated as the same product.
Engineering Features Behind Reliable Jarring
Sealing System
The QY series uses an optimized sealing arrangement and sealing materials intended to improve hydraulic reliability during repeated downhole operation.
Sealed Oil-Bath Mechanism
Critical moving components operate in a protected oil-bath environment, reducing direct wear and contamination of the core mechanism.
Hydraulic Release Passage
The enlarged release-channel flow area lowers hydraulic running resistance and supports consistent delay-and-release behavior.
Optional Mechanical Locking Module
A mechanical locking module can be incorporated for projects that require additional run-in control or a specific operating sequence.
Information Required for Quotation
For faster model selection and a technically useful quotation, send the main BHA and operating requirements rather than only requesting a price.
Related Drill-String Equipment
Drilling StabilizerCoordinate stabilizer placement and BHA stiffness with the complete directional or conventional drilling assembly.
Positive Displacement MotorFor directional drilling BHAs, review motor, connection and downhole tool compatibility as one system.
Oilfield Fishing ToolsFor recovery operations after a downhole incident, review compatible retrieval and fishing-tool options.
FAQ: Hydraulic Drilling Jar Selection & Procurement
How is the QY hydraulic drilling jar activated for upward and downward jarring?
The operator changes axial surface load on the drill string. Tension is used for an upward jarring cycle and controlled compression is used for a downward cycle. The hydraulic delay-release mechanism holds the load until the release condition is reached, after which the jarring stroke occurs.
Can the release force be adjusted after the jar is downhole?
The hydraulic release mechanism is controlled through the axial load applied from surface, so the operating force can be managed according to the downhole condition within the allowable range of the selected model.
What is the temperature limit of the standard QY series?
The standard QY Full Hydraulic Drilling Jar is specified for well temperatures not exceeding 160°C. A dedicated high-temperature drilling jar should be selected for higher-temperature well programs.
Which parameters are most important when choosing a QY model?
The main selection inputs are tool OD and ID, connection, tensile and torsional capacity, upward and downward release force, stroke, well temperature and compatibility with the surrounding BHA.
Why should tensile strength and torsional strength not be used alone to select the jar?
Those values describe only part of the tool’s mechanical capacity. The final selection must also account for connection limits, actual operating load, release-force setting, neighboring BHA components and the approved operating limits for the ordered configuration.
How do I choose between a hydraulic jar and a mechanical drilling jar?
Choose according to the required release mechanism, downhole operating strategy, load control and BHA design. The QY series uses hydraulic delay release with surface-controlled axial loading. A mechanical jar uses a different release principle and should be evaluated as a separate option when the drilling program favors mechanical activation.
What should be included in an RFQ for a hydraulic drilling jar?
Send the required OD/ID, connection, hole size, adjacent drill-string sizes, required upward/downward release force, maximum downhole temperature, expected axial and torsional loads, well profile and quantity. This allows the quotation to be based on an actual model rather than a generic jar price.
Specify the QY Jar Around Your BHA — Not Just by OD
Send your connection, tool envelope, expected loading, release-force requirement and maximum well temperature. Shangshanpetro can prepare a model-based quotation for the QY Full Hydraulic Drilling Jar.
