L&TD

DESCRIPTION

The Sondex 24 finger MIT has been designed to provide the most accurate tubing caliper measurements in the industry. The high quality of the data allows for 3 dimensional imaging and the calculation of rates of corrosion or scale deposition.

OPERATING PRINCIPLE 

The tool is run in the hole using mono-conductor cable or  Slickline. Once at the bottom the fingers are motored open. The spring loaded, hardened tip fingers push against the ID of the casing or tubing with a low constant force. As the tool is logged up the well, the movement of each finger is transferred to a position sensor. The output of the position sensor is then digitized for recording into memory or transmission up hole. Data from each finger is monitored independently. At the end of the run the fingers are motored closed for pulling out of hole or for repeat logging. The tool contains an inclinometer to denote the high side and well deviation. The temperature of the electronics is monitored for software correction of sensor drift.

APPLICATIONS 

• Quantification of scale build up and corrosion.

• Accurate location of holes or anomalies.

• Identification of tubing items and damage.

INTERFACES & TOOL COMBINATIONS

Switch-able for operation with other PLT tools (Ultralink only).

OPTIONS 

Stainless Steel or Beryllium-Copper Fingers.

Memory or Surface Readout (Slickline or Mono-conductor cable)

MITpro statistical joint analysis software

MITview 3D imaging software

SPECIFICATIONS (1 11/16" 24 FINGER MIT)

DESCRIPTION

This is easily transported toolstring, designed for use where access is restricted. The basic string, with Flowmeter, Temperature, Capacitance, Density, Gamma, Pressure & CCL sensors, can be used for Memory or Surface Readout operations; it can also be extended to include other Sondex tools and will operate a  variety of flowmeter mechanical sections.

For transportation in a small case, the string breaks down into very short sections. These hae pressure isolation ans can have other tools such as Centralisers, Knuckle Joints ect. Fitted between them. 

KEY POINTS 

• The short compact toolstring uses combined tools (QPC and CTF) to minimize tool length.
• 1 3/8" (35mm) OD tools
• The data quality is improved by reducing the spacing between sensors.
• Interchangeable flowmeter mechanical sections to match the completion
• Easy portability and reduced rig up height
• Can be run in surface readout or memory mode by adding a telemetry cartridge or memory recorder

SPECIFICATIONS

III. ANTI-COLLISION TO PRE-EXISTING WELLBORE WHILE DRILLING - ADVANCED SECURITY SYSTEM (ASS-2002):  

1. Introduction: 

   In drilling from offshore platforms there have been several cases where drilling a new well went directly into another neighboring production well and destroyed the casing of that well. This is due to very narrow well-to-well spacing (distance between the wells is 2.5-3.0m). So there is a demand to employ an Advanced Security System to detect this at an early stage before collision.

    The advanced security system detects the approach of the drill bit to casing of neibouring production wells. Data is sampled at high frequency from vibration sensors (Installed on well heads) and drilling sensors (WOH, RPM, TORQUE, SPP). The system uses the spectrum analyses of vibration signals by Fast Fourier Transform Algorithm. While drilling, if the drill bit   approaches a well then the is increasing and frequency of signal is concentrated in range of 300Hz - 700Hz. This phenomenon occurs more serverly with drilling parameter changes (eg: increasing of torque and/or decreasing of rate of penetration,..).

•  The system provides automated monitoring and detection of clash between the drill bit and casing of other neighboring production wells.

•  Internal Alarm Management (Set High /Low alarm, activates a buzzer when an alarm is detected).

• Printer management (Print out Real-time and Playback logs)
• Data management: Backup and store of Real-time database
• Calibration of the drilling sensors

•  Specifications

  Benefits and Features

- MKAB makes high about temperature and pressure for formations.(This is one of advantages when use MKAB).

- MKAB always fit up in a lubricator and can use in under balance.

-This equipment makes increasing recovery factor and can through christmas tree , tubing and perforate under packer.

- During using it, the well may be on situation of exploitation.

-The length of the gun may be up to 10 meters.

WellCAD is a single well-oriented system that operates under Win32, the 32 bits application-programming interface (API) from Microsoft.

WellCAD runs on Windows 3.1x, Windows 95, Windows NT and DEC Alpha AXP running Windows NT. WellCAD is OLE2 compliant and supports OLE object linking and embedding, OLE automation and drag and drop between WellCAD documents and other OLE compliant software.

Windows compatibility

Compatibility with Windows means that WellCAD printing and plotting is virtually hardware independent. Data exchange between WellCAD

and other data sources and repositories is extremely flexible using industry standard file formats and using the Windows clipboard and OLE functionality

WellCAD data types

WellCAD is capable of handling a diverse range of borehole information all on one document. These data types include:

• Conventional single curve well logs e.g natural gamma and density curves
  
• Full waveform sonic logs with wiggle, black and white and full colour VDL presentation    
  
• Image logs (FMS, televiewer, multi-am caplier)
• Structure logs(sine wave and arrow plots)
• Lithological logs with and without bed boundaries
  
• Comment full text logs. Mud logs (uneven depth sampled or time based data)
• Well construction and down-hole equipment logs
• OLE logs (containing embedded or linked objects from other applications) 

WellCAD Features

•  Windows 95 graphical user interface
• Multiple document interface
• Fully mouse driven
• Windows clipboard data exchange facilities
• Multiple log file import and export facilities
• Full log editing facilities
• WYSIWYG display and print preview
• OLE automation
• OLE drag and drop
• Global depth shift function
• Document templates
• Worksheet customization

WellCAD tools:

•  Header Editor - with independent zoom and rotation
• Formula Parser - with dynamic data link and formula browser
• Depth Matcher -for differentially squeezing and stretching logs
• Image and Structure Log Processing Module -for image log processing and interactive structure interpretation
• Tabular Editor - with dynamic data link

Application in L & TD – VSP.

WellCAD is powerful software and has been used for multi-purpose in L & TD. Since 1996 it has often been used for casing inspection quick look analysis plots. 

This picture presents a casing inspecting result in White Tiger oil field .

ADVANTAGES

• Able to log any angel well

• Same log quality as standard tools

• Tools always attached to drillpipe

• Mud circulation pass the tools

• Able to log long intervals

• Accurate depth control

DISADVANTAGES

Rig up and logging takes longer than standard logging

Picture of TPL drillpipe conveyed system

CAST-V – A COST-EFFECTIVE TOOL TO EVALUATE THE POTENTIAL ZONES IN FRACTURED BASEMENT.

The newest generation Circumferential Acoustic Scanning tool, the CAST-V made by Halliburton, provides a wealth of information in both open and cased holes. In open holes, the CAST-V provides complete borehole imaging for accurate formation evaluation. In cased holes, ultrasonic pipe inspection and cement evaluation can now be obtained simultaneously.

Operating over a wide range of downhole environments, the CAST-V data can be presented in a variety of two- and three- dimension formats. Powerful, yet user-friendly imaging analysis software is available to process the images, histograms and curve-type data.

Specifications

Openhole Operation

Primary applications include:

• Open Hole Borehole Imaging.

• Fracture Detection.

• Casing Inspection (Both Thickness And Diameter).

• Ultrasonic Cement Evaluation/ Imaging.

CAST-V HAS BEEN USED POPULARLY BY L&TD, VSP FOR STUDYING THE CHARACTERISTICS OF FRACTURES IN BASEMENT, CUU LONG BASIN.

The energy levels of reflected ultrasonic wave have been used:

- To locate the fracture zones.

- To differentiate between open fractures and filled fractures.

- To determine the geometric characteristics of fractures: dip, azimuth dip, and aperture.

In fact, surveys in basement of Cue long basin indicated that CAST-V is the most effective tool for studying basement fractures.

This open-hole CAST-V imaging was logged from fractured basement reservoir of White Tiger oil field. The upper plot shows clearly the open fractures both on amplitude (left) and transit time (right). These fracture zones are highly productive zones.

This plot clearly shows the closed fractures both on the amplitude (left) and transit time (right). These fracture zones are non-productive zones

          A productive zone was identified by CAST-V and traditional log (LLD, LLS, DT, NPHI, RHOB etc) measurements. This was confirmed with production logging data

The Sondex 40 and 60 finger MITs have been designed to provide the most accurate casing caliper measurements in the industry. The high quality of the data allows for 3 dimensional imaging and the calculation of rates of corrosion or scale deposition.

OPERATING PRINCIPLE

The tool is run in the hole using mono-conductor cable or Slickline. Once at the bottom of the logging interval the fingers and integral centralisers are motored open. The spring loaded, hardened tip fingers push against the ID of the casing or tubing with a low constant force. As the tool is logged up the well, the movement of each finger is transferred to a position sensor. The output of the position sensor is then digitised for recording into memory or transmission uphole. Data from each finger is monitored independently. At the end of the run the fingers are motored closed for pulling out of hole or for repeat logging. The tool contains an inclinometer to denote the high side and well deviation. The temperature of the electronics is monitored for software correction of sensor drift.

Application:

• Quantification of scale build up and corrosion.

• Accurate location of holes or anomalies.

• Identification of tubing items and damage.

INTERFACES & TOOL COMBINATIONS

Switchable for operation with other PLT tools (Ultralink only).

SPECIFICATIONS

Up to now, Vietsovpetro L&TD has conducted more than 250 jobs of csing inspection using Sondex MultiFinger Image Tools in Vietsovpetro’s oil fields. The result of these surveys have allowed the company to plan the proper solution for remedial works.

This is a very reliable, flexible tool with little less operation cost. It can be used in any well conditions (oil, gas, water, mud).

The pictures below are typical cases of broken casings observed in White Tiger production wells using 40-60 fingers MIT tools.