MAGNETIC THICKNESS DETECTOR
GOWell’s latest generation MTD tool is capable of evaluating quantitative thickness measurements of 3 concentric pipes. The state-of-the-art instrument combines a high power transmitter, improved signal-to-noise (SNR) electronics and fully configurable acquisition. This flexible approach allows a wide range of evaluations under different conditions and conveyance systems.
A simple engineer selection of the functional mode
allows features such as:
• Logging in large pipes (up to 18-5/8 inches)
• Fast logging of single pipes
• Chrome/alloy pipe evaluation
• Thick casings
• Memory-optimized logging
• Logging in any fluid type
The MTD tool works using the Pulsed Eddy Current (PEC) which is an electromagnetic transmitted signal, this pulsed square wave signal contains a broad spectrum of frequencies which is useful for characterising various pipe thicknesses and improves the depth of penetration. (vs. conventional fixed frequency Eddy Current tools).
Internally the tool acquires up to 300 channels of pulsed eddy current transient decay, that can be transmitted real-time to surface or stored downhole
Tool Physics: Pulsed Eddy Current (PEC)
Same depth Tx and Rx coils
Short High Energy Pulsed Transmission
Time Domain Received signal
2nd String Evaluation (MTD-B) Damage detected in the second string. Note that the damage from the 8-5/8” sector
MTD, Magnetic Thickness Detector, can evaluate the wear, fissures, changes in the thickness of the walls due to corrosion or friction in the Casing or the Tubing
PROBLEM FOUND THROUNGH TUBING
Problem: Liner not holding pressure
Findings: MFC showed a ¾” hole with mostly clean inner pipe surface, while MTD shows corrosion in the interval, suggesting damage comes from the annulus, in.
Added Value: Pinpointed the damaged tubulars, and detected a where the damage is coming from, which helps create a workover program
MFC, Multifinger Caliper to evaluate collapse, fissures, ovality, change in the Casing or Tubing ID. Available in 24 or 56 fingers.
Production and Injection Logging Sensors PLT/ILT Conventional
Pression / Temperature
CAT – Capacity Array Tools.
Flowmeter, Fullbore Spinner y Continuous Spinner
The Spinner´s threshold is not sufficient for low flow
Measure high water cuts > 90%
It uses an impeller, like a turbine flow measure that can´t rotate. Instead, the flow is measure detecting the torque produces by the static turbine. This focus have important advantages in reliability, response and maintenance.
0-60.000 bfd in 7”
Maxim Temperature Operation
150˚C - 302˚F
Maxim Pressure Operation
Maxim Tool Diameter
It doesn't have mobile parts and any bearings to hold the impeller, by this, his reliability and precision are not affected when doing maintenance.
There is no flow limits. The flow measure is continuous from zero.
Flow measurement almost instantaneous with no significant effect by the impeller inertia.
Easy detectable flow variations.
Minor effects in the measure by fluids density or viscosity.
1” OD SLIM PLT-ILT
Ultra Slim PLT that allows to go thru the Y-Tool with restrictions up to 1” ID and low Flow readings
Threshold aprox 2 m3/d
Sensors: Gamma, CCL, Temperature, Pression, Flowmeter (Threshold 2 m3/D), Dual Water hold-up. ( 0-100%)
WATER HOLDUP MULTI CAPACITANCE
Oil, Gas and Water have different dielectric constants, THE MULTICAP uses this properties to identify the multiphase flows. This tool is highly recommended for high deviated or horizontals wells.
The 12 and 6 capacitance mini sensors arrangement measure in radial form the different fluids phases.
12 and 6 capacitance mini sensors radial form arrangement.
The orientation of the tools is determined by an internal sensor.
It works through tubing for phase identification.
Fluid phase measure in radial form.
It has blades centralizer that can adapt the pipe diameter.
PLT- Microtorque Example – Oxy Infantas Oriente
PLT- Microtorque Example – ECP- Castilla 358
PLT Example- Production Well
POZO NELSON xx
Sequence of events:
Dynamic Logging to Q1
(Choque 128/64 12,4 MMscfd, 200 bwpd)
Dynamic Logging to Q2
(Choque 23/64 5,2 MMscfd, 200 bwpd
Static Logging after a 30 minutes shutdown
Static Logging after a 3 hours shutdown
4. OPTICAL FIBER: DTS
OPTICAL FIBER - DTS
Optical fiber for DTS temperature profiles, to monitor the production or injection wells. Generate production/injection profiles, losses and migrations.
PHYSICAL PRINCIPLES - DTS
The DTS uses the Raman effect to measure temperature
A optic laser pulse is send thru the fiber produces a disperse light that reflects in the transmission side. The intensity of the Raman dispersion is a temperature measure all the way thru the fiber. The anti-Stokes Raman signal changes his amplitude significantly with the temperature changes.
The position of the temperature reading is determined measuring the return light pulse arrival timing, similar to an radar echo. This method is called OTDR (Optical Time Domain Reflectometry).
Graph No 8. Heat Losses in the logging zone, Well Remojo, Jazmín K-09 (Division 5°F)
POZO: MORICHE AN-09
FRIO, INJECTION, REMOJO
5. GYRO – HIGH RESOLUTION
High Resolution North Seeking Continuous Gyro, Depth intervals as low as 0.1 FT; high accuracy in Inclination, Azimuth, Directional analysis (casing or tubing) to detect the Micro Dogleg, Tortuosity and Maxim Diameter analysis to evaluate the best BHA placement to reduce fatigue risk and wearing.