Product Overview
The Dog Latch Hydraulic Disconnect is a drop-ball actuated hydraulic emergency release tool for light & medium-load coiled tubing downhole operations. Operators deploy a matched drop ball through the coiled tubing inner bore; internal tubing pressure builds to trigger the dog latch hydraulic separation mechanism, allowing the downhole coiled tubing tool string to detach at the preset separation point.
Its core customizable advantage lies in interchangeable piston sleeves with different inner bore sizes. By swapping piston sleeves, users can freely adjust the matching drop ball size to adapt to different construction pressure and tubing inner diameter conditions. After hydraulic separation, the drop ball flows back to the ground surface together with circulating fluid, no ball debris remains downhole. The upper sub retains a standard GS internal fish neck structure, which can be matched with standard GS fishing tools to salvage and recover the lower separated tool assembly. This product is specially suitable for medium-load coiled tubing operations such as sand washing, well flushing and gas lifting.
Two complete service grades are supplied to match diverse reservoir environments: STD standard grade for conventional sweet oil wells without hydrogen sulfide corrosive media, and H₂S sour service grade constructed with sulfur-resistant alloy for high-H₂S corrosive sour gas well working conditions.
The standardized product lineup covers outer diameter sizes ranging from 1-11/16" to 3-1/8", with matched inner diameter, interchangeable drop ball size, make-up length and GS fish neck size specifications, equipped with standard AMMT and PAC bottom connection threads for universal compatibility with mainstream coiled tubing connectors and medium-load downhole service tools. Custom piston sleeve inner bore sizes, custom matching drop ball sizes, GS fish neck inner dimensions, wall thickness and anti-sulfur passivation coatings are available upon customer technical drawing submission.
Complete Technical Specification Table
| PN Part Number | Outer Diameter OD | Inner Diameter ID | Matching Drop Ball Size | Make-Up Length | Internal GS Fish Neck Size | Working Condition Grade | Bottom Connection Thread |
|---|---|---|---|---|---|---|---|
| L1221690120 | 1-11/16" | 0.27" | 7/16" | 13.7" | 1-1/2" | STD Standard | 1" AMMT |
| L1221750120 | 1-3/4" | 0.47" | 5/8" | 13.7" | 2" | STD Standard | 1" AMMT |
| L1222125120 | 2-1/8" | 0.47" | 5/8" | 14.2" | 2" | STD Standard | 1-1/2" AMMT |
| L1222875120 | 2-7/8" | 1.06" | 1-1/8" | 17" | 3" | STD Standard | 2-3/8" PAC |
| L1223125120 | 3-1/8" | 1.06" | 1-1/8" | 17" | 3" | STD Standard | 2-3/8" PAC |
| L1221690320 | 1-11/16" | 0.27" | 7/16" | 13.7" | 1-1/2" | H₂S Sour Service | 1" AMMT |
| L1221750320 | 1-3/4" | 0.47" | 5/8" | 13.7" | 2" | H₂S Sour Service | 1" AMMT |
| L1222125320 | 2-1/8" | 0.47" | 5/8" | 14.2" | 2" | H₂S Sour Service | 1-1/2" AMMT |
| L1222875320 | 2-7/8" | 1.06" | 1-1/8" | 17" | 3" | H₂S Sour Service | 2-3/8" PAC |
| L1223125320 | 3-1/8" | 1.06" | 1-1/8" | 17" | 3" | H₂S Sour Service | 2-3/8" PAC |
Note: Custom interchangeable piston sleeve inner bore size, custom matching drop ball size, outer diameter, inner bore flow size, anti-sulfur passivation coatings and non-standard length dog latch hydraulic disconnects are available via engineering consultation.
Core Features & Advantages
Interchangeable piston sleeve design: replace pistons with different inner bore sizes to freely adjust the matching drop ball size, flexible matching for various coiled tubing inner bore and construction pressure requirements
High-strength integral tool body, excellent high tensile load rating and strong anti-torsion performance, capable of bearing tension and torque generated during sand washing, flushing and gas lifting medium-load rotary coiled tubing operations:
Fully retrievable drop ball assembly: after hydraulic separation, the drop ball flows back to ground surface with circulating fluid, no metal ball components left downhole, avoiding coiled tubing inner bore blockage risks
Built-in standard GS internal fish neck structure, after tool separation, the upper sub reserves standard GS fishing profile, which can be quickly matched with conventional GS fishing tools to salvage the lost lower downhole tool assembly, greatly reducing downhole fishing construction difficulty:
Dual service grade design: STD standard version for conventional sweet oilfield working conditions, H₂S sulfur-resistant alloy version for highly corrosive high-H₂S sour gas well service
Complete outer diameter series compatible with 1-11/16", 1-3/4", 2-1/8", 2-7/8" and 3-1/8" coiled tubing matching assemblies, covering all mainstream small and medium-size coiled tubing light & medium-load downhole service demands:
Compact integrated dog latch hydraulic actuation structure, simple external threaded connection design, convenient for fast disassembly and assembly into the bottom coiled tubing tool string on site:
Precision CNC machined high-strength alloy steel tool body, excellent tensile, torsion, erosion and pressure fatigue resistance to extend continuous long-term medium-load downhole safety service cycle:
Multi-dimensional customizable technical parameters, including interchangeable piston sleeve inner bore size, matching drop ball size, GS fish neck inner dimension, outer diameter, bottom thread specification and anti-sulfur surface passivation coatings, to satisfy unique proprietary medium-load coiled tubing emergency release requirements:
Application Scenarios
1. Light & medium-load coiled tubing sand washing, well flushing, gas lifting and other low-tension downhole intervention treatments requiring emergency tool string release
2. Conventional sweet crude oil well medium-load coiled tubing emergency release safety protection service (STD standard service grade)
3. High-H₂S sour gas well corrosive environment medium-load coiled tubing tool string hydraulic separation emergency salvage construction
4. Downhole stuck tool string emergency release for sand washing, flushing and gas lifting non-heavy rotary operations, drop ball fully recyclable to surface without downhole debris
5. Long-term light & medium-load tension & torsion safety protection for coiled tubing strings in onshore and offshore oilfields
Standard Delivery Package
Complete dog latch hydraulic disconnect main body with built-in dog latch hydraulic actuation assembly
Multiple interchangeable piston sleeves of different inner bore sizes for on-site drop ball size adjustment
Matching size drop ball spare kit for field hydraulic separation operation
Full factory inspection test report including tensile load test, torsion resistance test, hydraulic separation pressure calibration test data
Product dimension drawing and official piston sleeve replacement, drop ball actuation, installation & operation instruction manual
Quality Warranty & After-Sales Service
Warranty Coverage: 12 months after factory shipment or 2000 cumulative working hours, whichever condition is reached first
Full factory inspection: Each finished dog latch hydraulic disconnect passes tensile load test, torsion resistance test and hydraulic separation pressure calibration before factory delivery
Free professional technical support: Our oilfield downhole tool engineering team provides tool string matching, interchangeable piston sleeve & drop ball size selection, hydraulic separation pressure parameter consultation free of charge
Long-term spare parts supply: All interchangeable piston sleeves and matching drop ball consumable accessories are stocked with competitive factory bulk pricing
Custom development service: Support custom piston sleeve inner bore sizes, custom matching drop ball sizes, bottom thread profiles, anti-corrosion coatings and special size dog latch hydraulic disconnects based on customer technical drawings
FAQ
Q1: What is the core function of a Dog Latch Hydraulic Disconnect??
The Dog Latch Hydraulic Disconnect is a medium-load drop-ball actuated hydraulic emergency release tool for coiled tubing sand washing, flushing and gas lifting work. Deploy a matched drop ball to build internal tubing pressure and trigger dog latch separation to detach the downhole tool string. It supports swapping interchangeable piston sleeves to adjust matching drop ball sizes, the drop ball flows back to ground after separation, and the upper sub retains a standard GS fish neck for salvaging lower stuck tools. Q2: What three core structural advantages does this dog latch hydraulic disconnect own? A2: 1. Interchangeable piston sleeve design, freely adjust matching drop ball size to fit different construction requirements; 2. High tensile and high torsion resistant alloy body, suitable for non-heavy sand washing, flushing and gas lifting operations; 3. Drop ball fully retrievable to ground, built-in standard GS internal fish neck compatible with standard GS fishing tools for salvage. Q3: What range of outer diameter sizes do these dog latch hydraulic disconnects support? A3: Our standard production lineup fully covers 1-11/16", 1-3/4", 2-1/8", 2-7/8" and 3-1/8" outer diameter specifications, compatible with global mainstream small and medium-size coiled tubing matching assemblies. Q4: What is the difference between STD standard grade and H₂S sour service grade? A4: STD standard grade is manufactured for conventional sweet oil wells without hydrogen sulfide corrosive fluid. H₂S sour service grade adopts sulfur-resistant alloy substrate and special anti-sulfur passivation coating to resist chemical corrosion in high-H₂S sour gas well environments. Q5: What is the standard production lead time for bulk purchase orders? A5: All standard PN part numbers are kept in factory inventory, goods can be delivered within 7–15 working days. Customized dog latch hydraulic disconnects with special piston sleeve inner bores or custom drop ball sizes require 20–35 working days production cycle, subject to total order quantity.
Get Custom Datasheet & Factory Quote
We are a professional OEM & ODM manufacturer focused on full series coiled tubing downhole service tools, covering dog latch interchangeable piston hydraulic disconnects, heavy duty high torsion hydraulic retrievable disconnects, mechanical hydraulic dual-action disconnects, mechanical adjustable shear tension disconnects, dual activated dual-action circulation valves, ball activated shear pin circulation valves, burst disc pressure circulation valves, double dart dual-stage sealing check valves, double flapper dual-stage sealing check valves, big ID single flapper check valves, grapple dimple composite connectors, grub screw heavy-duty connectors, double dimple-on connectors, single dimple-on connectors, double roll-on connectors, single roll-on connectors, internal grapple connectors, external grapple connectors, logging heads and tubing hangers. Every finished product undergoes strict factory tensile load, torsion resistance and hydraulic separation pressure calibration testing, with complete material inspection certification attached to each shipment. Please share your detailed technical requirements, including target outer diameter size, required interchangeable piston sleeve inner bore size & matching drop ball size, GS fish neck custom inner dimension, working environment (STD standard or H₂S sour service) and customized specification demands. Our dedicated oilfield downhole tool engineering team will send complete detailed technical datasheets and competitive factory wholesale quotations within 24 business hours.
