Description
Hydraulic Drilling Jar with Mechanical Locking for Stable Run-In and Controlled Jarring
QYSZ III is a double-acting full hydraulic drilling jar developed with an integrated mechanical locking system. The locking mechanism is designed to minimize unnecessary internal movement during normal drilling, while the hydraulic jarring section provides controlled upward and downward impact when the drill string becomes stuck.
Full Hydraulic Jarring
Up & Down Release
109-244 mm OD
Quick Answer: What Makes QYSZ III Different?
QYSZ III differs from a conventional full hydraulic drilling jar by adding a mechanical locking system around the hydraulic jarring concept. The lock is intended to keep internal moving components in a stable position during normal drilling and run-in, then allow controlled jarring operation when activation is required.
Why Use a Mechanical Locking System?
Reduced Unwanted Internal Movement
The locking mechanism helps restrain internal components during normal drilling before a jarring cycle is intentionally initiated.
Stable Locking Behavior
The supplied design description emphasizes reliable locking, low frictional resistance, and stable locking-force behavior.
Hydraulic Release Control
The hydraulic section allows axial load to build before energy is released into the impact stroke.
Double-Acting Operation
Both upward and downward release loads are specified for different stuck-string conditions.
When to Consider QYSZ III
QYSZ III is intended for drilling programs that require a full hydraulic double-acting jar but also value a mechanical locking structure during normal operation. It can be considered when procurement teams want more control over internal positioning before jarring while retaining hydraulic release behavior.
How the QYSZ III Works
During normal drilling and run-in, the mechanical locking structure helps maintain the internal components in their intended relative position. When jarring is required, axial loading from the surface is applied in the desired direction. The hydraulic control section delays movement while energy builds in the drill string.
Once the selected release condition is reached, the internal mechanism releases and stored elastic energy is converted into an impact. The jar can then be reset and cycled again. Because the tool is double acting, either upward or downward jarring can be used depending on the sticking condition and available surface load.
QYSZ III Hydraulic Drilling Jar Specifications
| Parameter | QYSZ III 108 | QYSZ III 121 | QYSZ III 165 | QYSZ III 203 | QYSZ III 241 |
|---|---|---|---|---|---|
| OD, in (mm) | 4 9/32 (109) | 4 25/32 (122) | 6 19/32 (167) | 8 1/8 (206) | 9 39/64 (244) |
| ID, in (mm) | 1 1/2 (38) | 2 (50.8) | 2 1/4 (2 3/4) / 57 (70) | 3 (76) | 3 (76) |
| Working Temperature, °C | 150 (per parameter table) | ||||
| Tensile Strength, kN | 1350 | 1950 | 3750 | 6230 | 8500 |
| Torsional Strength, kN·m | 16 | 25 | 70 | 135 | 165 |
| Rated Up Release Load, kN | 160 ± 25 | 180 ± 25 | 420 ± 25 | 425 ± 25 | 425 ± 25 |
| Rated Down Release Load, kN | 70 ± 25 | 80 ± 25 | 180 ± 25 | 205 ± 25 | 205 ± 25 |
| Maximum Up Release Load, kN | 250 | 350 | 700 | 1000 | 1250 |
| Maximum Down Release Load, kN | 120 | 180 | 350 | 500 | 650 |
| Total Stroke, in (mm) | 20 7/8 (530) | 25 (630) | 25 (630) | 25 (630) | 25 (630) |
Data note: the supplied QYSZ III narrative describes service below 160°C, while the parameter table lists 150°C. This page therefore uses 150°C in the specification table until the final factory rating is confirmed. The QYSZ III 165 ID is also listed as 57 (70) mm / 2 1/4 (2 3/4) in and should be confirmed for the ordered configuration.
Need a Hydraulic Jar with Added Mechanical Restraint?
Send your BHA, connection, required release loads, and maximum downhole temperature. We will match the request to the appropriate QYSZ III size and confirm the final technical configuration.
QY vs QYSZ III Hydraulic Drilling Jar
| Selection Factor | QY Full Hydraulic Jar | QYSZ III Hydraulic Jar |
|---|---|---|
| Primary concept | Full hydraulic delay-release | Full hydraulic jarring + mechanical locking system |
| Jarring direction | Upward + downward | Upward + downward |
| Mechanical locking | Not the primary differentiator | Integrated locking feature |
| Best fit | General hydraulic drilling-jar requirement | Hydraulic jar requirement with added internal locking stability |
How to Select the Correct QYSZ III Model
1. BHA Envelope
Start with OD and ID, then confirm wellbore clearance and BHA compatibility.
2. Up/Down Release Load
Compare rated and maximum release loads with the planned jarring program.
3. Tensile Capacity
Check the selected model against expected axial loading.
4. Torsional Capacity
Review torsional strength together with planned rotary torque.
5. Temperature
Send the maximum expected downhole temperature so the final rating can be confirmed.
6. Connection
Specify the required top and bottom thread connection for adjacent components.
Procurement Logic: When QYSZ III Makes Sense
QYSZ III is strongest when the buyer specifically wants the response characteristics of a full hydraulic drilling jar together with an additional mechanical locking structure. If a fully mechanical activation method is preferred, compare the QJZ Mechanical Drilling Jar. For a hybrid mechanical-hydraulic release concept, review the JYSZ Mechanical-Hydraulic Drilling Jar.
Information Required for Quotation
Send the specification through Contact Us for a Quote or email info@shangshanpetro.com.
Related Drilling Jar Options
QY High-Temperature Hydraulic Drilling JarDedicated option for wells requiring capability up to 204°C.
QJZ Mechanical Drilling JarFully mechanical double-acting option.
JYSZ Mechanical-Hydraulic Drilling JarHybrid mechanical-hydraulic double-acting jar.
FAQ: QYSZ III Hydraulic Drilling Jar
What is the main feature of QYSZ III?
Its defining feature is full hydraulic double-acting jarring combined with an integrated mechanical locking structure.
Can QYSZ III jar upward and downward?
Yes. The supplied specification lists both upward and downward release loads.
What sizes are available?
QYSZ III 108, 121, 165, 203 and 241, covering 109 mm to 244 mm OD.
What is the working temperature?
The parameter table lists 150°C, while the narrative says below 160°C. The final ordered temperature rating should therefore be confirmed before quotation and production.
How is QYSZ III different from QY?
Both are hydraulic jars, but QYSZ III adds a mechanical locking structure as its principal design difference.
Request a QYSZ III Technical Quote
Send the required OD, connection, BHA, release loads, and temperature. Shangshanpetro can confirm the appropriate QYSZ III model and final configuration before quotation.
