Introduction

Crawler refers to a class of underground conveying equipment fit for use in horizontal wells and those with a large inclination. It can be self-powered to carry a piece of down-hole equipment to the target location in case that the load ceases to move downwards due to the action of gravity。

Features

• A hydraulic crawler is comprised mainly of a on-ground control system as well as a down-hole instrument string and control system.

• Fitted with a on-ground control system that features a three-tiered intelligent collaborative architecture to offer an industrial-grade solution, which integrates real-time measurement, high-precision control and data management, demonstrating a high-degree integration of modernized industrial automation with advanced measurement and control technologies.

• Equipped with a downhole system that adopts a sophisticated modular series layout to ensure a smooth, coordinated operation between mechanical connections, electrical transmissions and hydraulic works in high-pressure, high-temperature, confined spaces, while a high degree of both flexibility and reliability is required.

Specifications

Technical standards for ground control systems

Operating temperature range	-25 ~ 70℃
Storage temperature	-40 ~ 70℃
Power Supply	220VAC, 50 ~ 60Hz
Supply Current	10A
Output voltage	0 ~ 1200VDC
Output current	0 ~ 4.5A
External dimensions L × W × H	550×483×133mm
Weight	≤ 15Kg
Shock	50g three‑dimensional (11ms)
Vibration	5g three‑dimensional (10 ~ 60Hz)

Technical standard of downhole control system

Maximum operating temperature	350 °F (175°C)
Maximum bearing pressure	20000psi (138MPa)
Outer diameter dimension	φ54mm、φ70mm、φ80mm、φ86mm
Input voltage	600 VDC
Input current	4.5A
Regular crawl speed	0 ~ 10 m/min (full load)
Applicable sleeve size	4.25 in. (108mm) ‑ 15 in. (381mm)
Fit cable	Single‑core/multi‑core
Maximum load	1200 kg (4 Section drive)
Total instrument length	24.86 ft. (7.58 m) (4 Section drive)
Instrument Weight	245 kg (4 Section drive)
Shock	50g three‑dimensional (11ms)
Vibration	5g three‑dimensional (10 ~ 60Hz)

Crawler refers to a class of underground conveying equipment fit for use in horizontal wells and those with a large inclination.