Survey / Steering Services, Systems & Tools
By SDI, Worldwide Provider of Directional & Horizontal Drilling Services
Scientific Drilling International (SDI) offers the use of either Gyro or Magnetic technologies for survey and steering services, systems and tools.
SDI’s unique Keeper multi-mode, high-end gyro survey system offers a range of survey, steering and MWD possibilities for the most demanding of programs, be it from definitive casing or tubing surveys on wireline, the unique siteline mode on floating structures, memory on slick-line, or drop gyro mode for multiple configurations.
The Keeper system runs in a continuous navigation mode and can be programmed to survey over very short intervals as short as one foot.
Keeper remains the most versatile high-accuracy gyro in the industry. It has become recognized as a benchmark technology when considering gyro navigation. Its unique sensor configuration allows for continuous gyro survey or steering operations in all casing, tubing and drill pipe sizes.
Keeper has also proved invaluable in the application of river crossing and construction bores requiring definitive positioning. Keeper can be coupled to several of SDI’s other technologies permitting simultaneous gyro-temperature runs, gyro-gamma-CCL, as well as oriented perforating and combination gyro survey or gyro orientation logging projects.
Memory Keeper is an extension of its proven Keeper Gyro Surveying System. Using state-of-the-art wireline surveyor sensors, the Memory Keeper uses either alkaline or lithium batteries with an optional CCL/gamma. It produces highly accurate gyro surveys at locations where wireline is not available or where the reduced cost of slick-line is a plus.
Floating Platform Survey Operations click here for short video
Modern north-seeking gyro technology requires absolute stillness during in-hole survey initialization, which can be very difficult to achieve on floating platforms or during near-seabed operations. SDI has two unique solutions for these specialized situations: the Sightline Keeper and the Locking Arm.
Sightline Keeper operates a high-accuracy Keeper survey instrument much like a conventional surface readout gyro system, by incorporating a sight-reference heading as the survey initialization, no still time is required.
The Keeper Locking Arm utilizes specialized tool components to stabilize the tool against movement when surveying on floating rigs. This technique has been used in deepwater projects worldwide, and allows for the highest-level of survey quality, even when operating in high seas.
The Keeper AdK is a smart drop memory tool for all-attitude operations including high angle applications. The AdK drop gyro system bridges the technology gap between a conventional drop system and the capabilities of the definitive wireline multi-mode Keeper. With the use of a proprietary onboard smart control system, the tool is capable of delivering performance in line with a definitive wireline conveyed system.
Electronic Multi-shot Survey System
The Electronic Multi-shot System (EMS) uses the same high-accuracy magnetic survey package as SDI’s MWD systems. The system is used in conjunction with non-magnetic collars placed in the drillstring to survey during a trip out of the hole.
Data is downloaded from the tool upon tool’s onboard memory and correlated to depth recorded during the trip. Sufficient onboard memory allows for extended survey runs in long hole sections.
HPHT Electronic Multi-shot Survey System
An HPHT version of the Electronic multi-shot survey tool is capable of running in temperatures up to 600°F (315°C) and bottom-hole pressures up to 33,000 psi.
Electronic Magnetic Steering System
The Electronic Magnetic Steering System is based on a 1" O.D. solid-state downhole probe. The probe’s sensor package of tri-axis flux gate magnetometers and tri-axis fluid dampened accelerometers provides an all-attitude survey/steering capability.
With proven reliability under the harshest of drilling conditions the probe's small O.D. enables a wide choice of options of running gear configuration.
Data transmitted includes all required survey information, continuous toolface, individual sensor outputs, temperature, total magnetic and total gravity field strengths. Steering and surveying information is instantaneously transmitted to the remote drill floor readout.
Core Orientation Survey System
Electronic Multi-shot System for Core Orientations allows directional core data without interruptions to the coring operation. The advanced solid-state magnetic measurement system eliminates the need to stop coring and circulating for data points, greatly reducing the chance of jamming or differential sticking.
The variable delay mode and shot intervals makes it possible to have data points every 0.1 to 0.5 feet. Data is recorded electronically downhole. The memory is nonvolatile for data retention.