Product Overview
The Logging Motorhead Assembly modular integrated multi-section coiled tubing logging tool head is a five-function combined downhole tool specially developed for coiled tubing through-tubing well logging construction operations. The entire motorhead unit integrates five independent functional short subs into one compact integral assembly, sequentially from top to bottom: cable anchoring short sub, quick crossover connection short sub, through-cable dual flapper one-way check valve short sub, through-cable differential hydraulic disconnect release short sub, and through-cable circulation valve shut-off short sub.
In normal well logging running-in or pulling-out operations, all internal flow passages of the circulation valve are kept fully open to allow normal circulation of wellbore protective fluid; the dual flapper one-way check valve maintains reliable reverse flow shut-off performance to block high-pressure wellbore fluid backflow into the upper coiled tubing string, avoiding cable and logging tool damage caused by reverse pressure impact. The top cable anchor sub provides stable clamping and anchoring support for the internal logging cable, preventing axial cable pulling displacement during tool string tripping movement. The intermediate quick connector simplifies on-site coiled tubing and lower logging tool string crossover connection steps, reducing field assembly time and lowering connection thread leakage risk.
In emergency well control accident scenarios, the internal sliding sleeve of the circulation valve will slide downward under the preset differential pressure threshold, completely closing all internal fluid circulation passages; as the circulation flow path is blocked, the fluid pressure inside the coiled tubing string will continue to accumulate and rise until reaching the pre-set shear pin breaking pressure value; the pressure difference pushes the internal piston of the differential hydraulic disconnect sub to slide downward and shear all pre-installed shear pins, realizing complete separation and release of the entire downhole logging tool string from the upper coiled tubing conveyance string, providing reliable emergency safety release protection for well control accident disposal.
The tool adopts pure differential pressure driven actuation design, no additional ball dropping or mechanical shifting operations are required during emergency triggering; the overall assembly structure is compact and neat, with simple on-site disassembly and assembly processes, and the emergency release action performance is stable and reliable. Two optional working condition material grades are provided for user selection according to different downhole wellbore fluid environments: STD standard carbon steel material for conventional low-corrosion wellbore construction conditions, and H₂S sour service special anti-sulfide stress corrosion alloy material that meets NACE MR0175 standard, suitable for high hydrogen sulfide content corrosive downhole construction environments. Three standard matching outer diameter sizes are supported: 1-11/16 inch, 2-1/8 inch and 2-7/8 inch, each OD corresponds to fixed matched top AMMT coiled tubing connection thread and bottom 1-3/16" GO Pin fishing connector, convenient for standardized on-site coiled tubing and subsequent fishing tool matching selection.
The Logging Motorhead Assembly has no complex internal movable friction components, spring energy storage assemblies or differential pressure release mechanisms, with extremely simplified wellsite operation flow and low routine maintenance cost; construction crews only need to connect the top AMMT thread of the motorhead assembly to the bottom end of the coiled tubing string, and connect the bottom GO Pin fishing connector to the upper end of the downhole logging tool string to complete the whole tool string assembly, then run the tool string down along the wellbore inner wall to the predetermined target logging depth to carry out normal well logging data acquisition operations; in case of emergency well control accidents, the circulation valve and differential hydraulic disconnect sub will sequentially actuate under preset differential pressure to close circulation flow paths and release the entire logging tool string automatically without any manual surface auxiliary operations, effectively shortening emergency accident disposal time and reducing well control safety risks. After the logging construction work or emergency disposal work is fully completed, lift the whole coiled tubing string together with the logging motorhead assembly out of the wellbore to finish operation, no additional complex auxiliary operation steps such as separate ball dropping or multi-stage shear pin triggering are needed.
The standardized product lineup covers three standard matching outer diameter sizes of 1-11/16", 2-1/8" and 2-7/8", each OD corresponds to fixed matched top AMMT connection thread and bottom 1-3/16" GO Pin fishing connector, all models adopt STD standard working condition configuration with optional H₂S sour service alloy material grade; custom shear pin breaking pressure threshold, circulation valve closing differential pressure value, outer diameter size and connection thread specification customization are available upon customer technical drawing submission.
Complete Technical Specification Table
| PN Part Number | Outer Diameter OD | Working Condition Grade | Top Connection Thread | Bottom Fishing Connector |
|---|---|---|---|---|
| L1241690120 | 1-11/16" | STD Standard Carbon Steel | 1" AMMT | 1-3/16" GO Pin |
| L1242125120 | 2-1/8" | STD Standard Carbon Steel | 1-1/2" AMMT | 1-3/16" GO Pin |
| L1242875120 | 2-7/8" | STD Standard Carbon Steel | 2-3/8" PAC | 1-3/16" GO Pin |
| L1241690320 | 1-11/16" | H₂S Sour Service Anti-Corrosion Alloy | 1" AMMT | 1-3/16" GO Pin |
| L1242125320 | 2-1/8" | H₂S Sour Service Anti-Corrosion Alloy | 1-1/2" AMMT | 1-3/16" GO Pin |
| L1242875320 | 2-7/8" | H₂S Sour Service Anti-Corrosion Alloy | 2-3/8" PAC | 1-3/16" GO Pin |
Note: Custom shear pin breaking pressure threshold values, circulation valve closing differential pressure values, outer diameter size specifications and internal / external connection thread specification modifications are available via engineering consultation. All standard specifications adopt STD standard carbon steel working condition configuration with optional H₂S sour service anti-sulfide stress corrosion alloy material grade; three standard matching outer diameter OD sizes are provided: 1-11/16", 2-1/8", 2-7/8", each OD corresponds to fixed matched top AMMT / PAC connection thread and unified bottom 1-3/16" GO Pin fishing connector.
Core Features & Advantages
Five-In-One Integrated Compact Modular Structural Design: Five independent core functional short subs (cable anchor sub, quick connector, dual flapper one-way check valve, differential hydraulic disconnect sub, circulation valve sub) are integrated into one single compact integral motorhead unit, eliminating the need for separate stacking and connection of five individual short subs on-site, greatly simplifying on-site tool string assembly operation procedures, shortening rig-up construction time, and reducing the risk of fluid leakage at multiple separate connection thread joints to improve overall tool string sealing reliability.
Two-Stage Sequential Differential Pressure Emergency Safety Actuation Design: The tool adopts a two-step sequential pressure action safety mechanism; when emergency well control accidents occur, the internal sliding sleeve of the circulation valve first slides downward under the preset low differential pressure threshold to fully close all internal fluid circulation passages and cut off the wellbore fluid circulation channel; as the circulation flow path is blocked, the fluid pressure inside the coiled tubing string continuously accumulates and rises until reaching the higher preset shear pin breaking pressure value, the pressure difference pushes the internal piston of the differential hydraulic disconnect sub to slide downward and shear all pre-installed shear pins, realizing complete separation and release of the entire downhole logging tool string from the upper coiled tubing conveyance string, providing dual-layer reliable emergency safety release protection for well control accident disposal, avoiding tool string sticking loss risks caused by delayed release.
Built-In Dual Flapper One-Way Check Valve Anti-Backflow Protection Design: The intermediate dual flapper one-way check valve sub adopts double parallel flapper sealing structural layout, the two groups of flapper sealing plates form redundant bidirectional fluid shut-off barriers, providing stable and reliable reverse high-pressure wellbore fluid backflow blocking performance during all stages of tool string running-in, logging construction and pulling-out operations, effectively preventing high-pressure wellbore fluid from flowing backward into the upper coiled tubing string to avoid internal logging cable extrusion damage and logging instrument failure risks caused by reverse pressure impact.
Top Cable Anchor Sub Stable Cable Clamping & Anchoring Design: The built-in cable anchoring short sub at the uppermost end of the motorhead assembly is equipped with multi-group arc-shaped cable clamping locking structures, which can provide stable uniform clamping and anchoring support for the internal logging cable, effectively limiting axial cable pulling displacement and radial cable shaking offset during the up and down tripping movement of the tool string in the wellbore, avoiding cable tensile breakage and internal cable core wiring loose contact failure risks.
Intermediate Quick Crossover Connector Simplified On-Site Assembly Design: The quick crossover connection short sub is arranged between the cable anchor sub and the dual flapper check valve sub, adopting standard matching internal crossover thread specifications, which can quickly realize the threaded connection between the upper cable anchor assembly and the lower logging tool string assembly, eliminating complex multi-step thread matching and sealing adjustment procedures, further shortening on-site tool string assembly construction time and lowering human error risks during manual assembly operations.
Dual Optional Working Condition Material Grade Matching Design: Two independent working condition material grade versions are provided for free customer selection according to different downhole wellbore fluid corrosion environment requirements: Version one: STD standard carbon steel material, cost-effective, suitable for conventional low-sulfur, low-corrosion oil and gas well construction working conditions; Version two: H₂S sour service special anti-sulfide stress corrosion alloy material, fully complies with NACE MR0175 international anti-sulfur corrosion standard, with excellent resistance to hydrogen sulfide containing corrosive wellbore fluid erosion, suitable for high H₂S concentration sour oil and gas well construction severe working conditions.
Standardized Matching Connection Thread & Fishing Connector Design: Three standard matching outer diameter size specifications are provided to cover mainstream oilfield coiled tubing outer diameter sizes: 1-11/16", 2-1/8", 2-7/8", each OD size corresponds to fixed matched standard AMMT coiled tubing connection thread at the upper end and unified 1-3/16" GO Pin fishing connector at the lower end; the GO Pin bottom fishing joint adopts industry universal standard fishing structure, which can be quickly matched with all conventional coiled tubing fishing tools to facilitate subsequent salvage and recovery operations in case of accidental tool string release, avoiding permanent downhole tool string loss risks.
Ultra-Simplified Wellsite Operation Logic & Low Routine Maintenance Design: The logging motorhead assembly has no complex internal movable friction components or spring energy storage assemblies, the overall assembly structure is compact and neat, the internal functional modules adopt wear-resistant integrated forming parts with long service life; the whole tool string assembly operation flow is highly streamlined, only two groups of threaded connection steps are needed to complete the installation of the entire motorhead assembly between coiled tubing and logging tool string, no additional complicated auxiliary operation steps are required; after each well logging construction operation is completed, only simple surface circulating fluid debris flushing cleaning and internal dual flapper check valve sealing surface & shear pin wear inspection are required, no complex disassembly, internal functional module component replacement or spring preload adjustment maintenance procedures, greatly reducing daily maintenance labor and spare parts inventory cost.
Application Scenarios
1. Conventional oil and gas well coiled tubing through-tubing well logging construction multi-function heavy-load intervention treatment operations, including normal well logging data acquisition, downhole wellbore fluid property testing and routine well condition inspection work
2. High hydrogen sulfide containing sour oil and gas well coiled tubing through-tubing well logging construction heavy-load intervention treatment operations, applicable to severe H₂S corrosive downhole wellbore fluid environments
3. Emergency well control accident disposal safety intervention construction operations, providing reliable two-stage sequential differential pressure automatic emergency release protection for downhole logging tool strings to avoid tool string sticking loss risks
4. Onshore and offshore oilfield coiled tubing well logging multi-type logging instrument matching construction operations, compatible with all mainstream coiled tubing logging tool string combinations and supporting subsequent salvage and recovery operations via standard GO Pin fishing connectors
Standard Delivery Package
Complete five-section integrated logging motorhead assembly integral pre-assembled unit including top cable anchor sub, quick crossover connection sub, dual flapper one-way check valve sub, differential hydraulic disconnect release sub and bottom circulation valve shut-off sub
Spare interchangeable shear pin maintenance kit for on-site shear pin breaking pressure threshold adjustment and worn shear pin replacement
Full factory inspection test report including repeated two-stage sequential differential pressure emergency actuation load fatigue resistance test, integral tensile load test, dual flapper check valve reverse sealing performance calibration test data
Product dimension drawing and official installation & operation instruction manual, with detailed on-site coiled tubing through-tubing well logging construction operation guidance, with clear confirmation reminder for working condition material grade selection, shear pin breaking pressure threshold setting and connection thread matching selection according to different downhole wellbore fluid corrosion environment and well construction operation scheme demands during order placement
Quality Warranty & After-Sales Service
Warranty Coverage: 12 months after factory shipment or 2000 cumulative two-stage sequential differential pressure emergency actuation load cycles, whichever condition is reached first
Full factory inspection: Each finished five-section integrated logging motorhead assembly passes integral tensile load test, repeated two-stage sequential differential pressure emergency actuation load fatigue test, dual flapper check valve reverse sealing performance calibration test before factory delivery
Free professional technical support: Our oilfield downhole tool engineering team provides coiled tubing through-tubing well logging remedial workover tool string matching, matching outer diameter OD size, working condition material grade selection, shear pin breaking pressure threshold setting and internal / external connection thread specification customization consultation free of charge
Long-term spare parts supply: All interchangeable shear pin wear maintenance accessories are stocked with competitive factory bulk pricing
Custom development service: Support custom shear pin breaking pressure threshold specifications, customized circulation valve closing differential pressure values, outer diameter OD size adjustments, internal / external connection thread specification modifications, base material corrosion resistance grade changes and special size five-section integrated logging motorhead assemblies based on customer technical drawings
FAQ
Q1: What is the core function of a Logging Motorhead Assembly Modular Integrated Coiled Tubing Logging Tool Head With Differential Pressure Emergency Hydraulic Disconnect & Circulation Shut-Off Function?
The Logging Motorhead Assembly modular integrated multi-section coiled tubing logging tool head is a five-function combined downhole tool specially developed for coiled tubing through-tubing well logging construction operations. The entire motorhead unit integrates five independent functional short subs into one compact integral assembly, sequentially from top to bottom: cable anchoring short sub, quick crossover connection short sub, through-cable dual flapper one-way check valve short sub, through-cable differential hydraulic disconnect release short sub, and through-cable circulation valve shut-off short sub. In normal well logging running-in or pulling-out operations, all internal flow passages of the circulation valve are kept fully open to allow normal circulation of wellbore protective fluid; the dual flapper one-way check valve maintains reliable reverse flow shut-off performance to block high-pressure wellbore fluid backflow into the upper coiled tubing string, avoiding cable and logging tool damage caused by reverse pressure impact. The top cable anchor sub provides stable clamping and anchoring support for the internal logging cable, preventing axial cable pulling displacement during tool string tripping movement. The intermediate quick connector simplifies on-site coiled tubing and lower logging tool string crossover connection steps, reducing field assembly time and lowering connection thread leakage risk. In emergency well control accident scenarios, the internal sliding sleeve of the circulation valve will slide downward under the preset differential pressure threshold, completely closing all internal fluid circulation passages; as the circulation flow path is blocked, the fluid pressure inside the coiled tubing string will continue to accumulate and rise until reaching the pre-set shear pin breaking pressure value; the pressure difference pushes the internal piston of the differential hydraulic disconnect sub to slide downward and shear all pre-installed shear pins, realizing complete separation and release of the entire downhole logging tool string from the upper coiled tubing conveyance string, providing reliable emergency safety release protection for well control accident disposal. The tool adopts pure differential pressure driven actuation design, no additional ball dropping or mechanical shifting operations are required during emergency triggering; the overall assembly structure is compact and neat, with simple on-site disassembly and assembly processes, and the emergency release action performance is stable and reliable. Two optional working condition material grades are provided for user selection according to different downhole wellbore fluid environments: STD standard carbon steel material for conventional low-corrosion wellbore construction conditions, and H₂S sour service special anti-sulfide stress corrosion alloy material that meets NACE MR0175 standard, suitable for high hydrogen sulfide content corrosive downhole construction environments. Three standard matching outer diameter sizes are supported: 1-11/16 inch, 2-1/8 inch and 2-7/8 inch, each OD corresponds to fixed matched top AMMT coiled tubing connection thread and bottom 1-3/16" GO Pin fishing connector, convenient for standardized on-site coiled tubing and subsequent fishing tool matching selection. No complex internal movable friction components or spring assemblies are equipped, operation flow is highly simplified, widely applied for conventional / sour oil and gas well coiled tubing through-tubing well logging construction multi-function heavy-load intervention treatment operations, including normal well logging data acquisition, downhole wellbore fluid property testing, routine well condition inspection and emergency well control accident disposal safety intervention construction operations.
Q2: What three core structural advantages does this Logging Motorhead Assembly Modular Integrated Coiled Tubing Logging Tool Head With Differential Pressure Emergency Hydraulic Disconnect & Circulation Shut-Off Function own?
1. Five-in-one integrated compact modular structural design, five independent core functional short subs (cable anchor sub, quick connector, dual flapper one-way check valve, differential hydraulic disconnect sub, circulation valve sub) are integrated into one single compact integral motorhead unit, eliminating the need for separate stacking and connection of five individual short subs on-site, greatly simplifying on-site tool string assembly operation procedures, shortening rig-up construction time, and reducing the risk of fluid leakage at multiple separate connection thread joints to improve overall tool string sealing reliability; 2. Two-stage sequential differential pressure emergency safety actuation design & dual optional working condition material grade matching design, the tool adopts a two-step sequential pressure action safety mechanism; when emergency well control accidents occur, the internal sliding sleeve of the circulation valve first slides downward under the preset low differential pressure threshold to fully close all internal fluid circulation passages and cut off the wellbore fluid circulation channel; as the circulation flow path is blocked, the fluid pressure inside the coiled tubing string continuously accumulates and rises until reaching the higher preset shear pin breaking pressure value, the pressure difference pushes the internal piston of the differential hydraulic disconnect sub to slide downward and shear all pre-installed shear pins, realizing complete separation and release of the entire downhole logging tool string from the upper coiled tubing conveyance string, providing dual-layer reliable emergency safety release protection for well control accident disposal, avoiding tool string sticking loss risks caused by delayed release; two independent working condition material grade versions are provided for free customer selection according to different downhole wellbore fluid corrosion environment requirements: Version one: STD standard carbon steel material, cost-effective, suitable for conventional low-sulfur, low-corrosion oil and gas well construction working conditions; Version two: H₂S sour service special anti-sulfide stress corrosion alloy material, fully complies with NACE MR0175 international anti-sulfur corrosion standard, with excellent resistance to hydrogen sulfide containing corrosive wellbore fluid erosion, suitable for high H₂S concentration sour oil and gas well construction severe working conditions; 3. Built-in dual flapper one-way check valve anti-backflow protection design + top cable anchor sub stable cable clamping & anchoring design + standardized matching connection thread & fishing connector design ultra-simplified wellsite operation logic, the intermediate dual flapper one-way check valve sub adopts double parallel flapper sealing structural layout, the two groups of flapper sealing plates form redundant bidirectional fluid shut-off barriers, providing stable and reliable reverse high-pressure wellbore fluid backflow blocking performance during all stages of tool string running-in, logging construction and pulling-out operations, effectively preventing high-pressure wellbore fluid from flowing backward into the upper coiled tubing string to avoid internal logging cable extrusion damage and logging instrument failure risks caused by reverse pressure impact; the built-in cable anchoring short sub at the uppermost end of the motorhead assembly is equipped with multi-group arc-shaped cable clamping locking structures, which can provide stable uniform clamping and anchoring support for the internal logging cable, effectively limiting axial cable pulling displacement and radial cable shaking offset during the up and down tripping movement of the tool string in the wellbore, avoiding cable tensile breakage and internal cable core wiring loose contact failure risks; three standard matching outer diameter size specifications are provided to cover mainstream oilfield coiled tubing outer diameter sizes: 1-11/16", 2-1/8", 2-7/8", each OD size corresponds to fixed matched standard AMMT coiled tubing connection thread at the upper end and unified 1-3/16" GO Pin fishing connector at the lower end; the GO Pin bottom fishing joint adopts industry universal standard fishing structure, which can be quickly matched with all conventional coiled tubing fishing tools to facilitate subsequent salvage and recovery operations in case of accidental tool string release, avoiding permanent downhole tool string loss risks; the logging motorhead assembly has no complex internal movable friction components or spring energy storage assemblies, the operation flow is highly streamlined, only two groups of threaded connection steps are needed to complete the installation of the entire motorhead assembly between coiled tubing and logging tool string, no additional complicated auxiliary operation steps are required; after the logging construction work or emergency disposal work is fully completed, lift the whole coiled tubing string together with the logging motorhead assembly out of the wellbore to finish operation, no complex auxiliary operation steps such as separate ball dropping or multi-stage shear pin triggering are needed to shorten wellsite operation time and reduce human error risks; the product also features fully customizable jet nozzle layout design, three standard matching outer diameter size series and fully customizable thread connection specification to further expand applicable construction scope and reduce on-site operation workload.
Q3: What matching outer diameter sizes and configurable options do these Logging Motorhead Assembly Modular Integrated Coiled Tubing Logging Tool Head With Differential Pressure Emergency Hydraulic Disconnect & Circulation Shut-Off Function support?
Our standard applicable matching outer diameter size range covers 1-11/16", 2-1/8", 2-7/8". Each OD size supports four independent configurable options for free matching selection: shear pin breaking pressure threshold specification, circulation valve closing differential pressure value adjustment, internal functional module structural form modification, base material corrosion resistance grade. All models support fully customizable thread connection specifications upon customer request. Three standard matching outer diameter size sizes correspond to fixed overall make-up length dimensions and unified bottom 1-3/16" GO Pin fishing connector specifications respectively. Two independent working condition material grade versions are also optional for each OD size: STD standard carbon steel working condition grade and H₂S sour service high-corrosion-resistant alloy working condition grade. Custom shear pin breaking pressure threshold specifications, circulation valve closing differential pressure value adjustments, internal functional module structural form modifications, base material corrosion resistance grade modifications and special size five-section integrated logging motorhead assemblies are available upon customer downhole wellbore fluid H₂S concentration corrosive environment construction demands.
Q4: What is the standard production lead time for bulk purchase orders?
All standard PN part numbers are kept in factory inventory, goods can be delivered within 7–15 working days. Customized five-section integrated logging motorhead assemblies with special matching outer diameter OD sizes or customized shear pin breaking pressure threshold specifications, circulation valve closing differential pressure value adjustments, internal functional module structural form modifications, base material corrosion resistance grade modifications require 20–35 working days production cycle, subject to total order quantity and customization scope.
Get Custom Datasheet & Factory Quote
We are a professional OEM & ODM manufacturer focused on full series oilfield coiled tubing through-tubing well logging construction multi-function heavy-load intervention treatment service tools, covering five-section integrated logging motorhead assemblies, integrated sand jetting subs, differential sliding sleeve jetting subs, coiled tubing suspension hangers, bypass flow divider valves, hydraulic pulse vibration shock exciters, thru-tubing hydraulic retractable blade underreamers, tapered pear conical pilot milling shoes, concave recessed milling shoes, five-blade five-wing milling shoes, flat bottom milling shoes, combination flat blade milling shoes, muncher multi-cutting milling shoes, convex nose pilot milling shoes, bi-directional reciprocating impact hammers, coiled tubing positive displacement drill motors, downhole gas-liquid separators, impact hammers, magnetic fishing rods, magnetic junk retrieval magnets, venturi junk baskets, flow activated releasable fishing overshots, flow activated releasable fishing spears, flow activated releasable JDC running/pulling tools, flow activated releasable GS fishing tools, bi-direction mechanical accelerators, bi-direction hydraulic accelerators, bi-direction hydraulic jars, up-stroke hydraulic jars, bi-direction mechanical jars, up-stroke mechanical jars, wireline grabs, wireline spears and all other supporting downhole fishing, jarring, anchoring and washing service tools. Every finished product undergoes strict factory tensile load, repeated two-stage sequential differential pressure emergency actuation load fatigue, dual flapper check valve reverse sealing performance calibration testing, with complete material inspection certification attached to each shipment. Please share your detailed technical requirements, including target matching outer diameter OD size, required shear pin breaking pressure threshold specification, circulation valve closing differential pressure value selection, internal functional module structural form demands, thread connection customization requirements, downhole wellbore fluid H₂S concentration corrosive environment construction conditions, working environment and all 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, and provide professional on-site coiled tubing through-tubing well logging construction operation guidance, with clear confirmation reminder for working condition material grade selection, shear pin breaking pressure threshold setting and thread connection customization requirements according to different well construction operation scheme demands during order placement.
