• Xưởng sửa chữa máy địa vật lý

    Xưởng có nhiệm vụ chính là bảo dưỡng, sửa chữa và hiệu chỉnh các máy móc thiết bị điện tử phục vụ cho các đơn vị trong Xí nghiệp địa vật lý giếng khoan. Ngoài ra xưởng còn nghiên cứu đưa vào ứng dụng và phát triển công nghệ tin học trong công tác địa vật lý

  • Trung tâm Phân tích và Xử lý số liệu

    Có nhiệm vụ đánh giá chất lượng tài liệu do Xí nghiệp Địa vật lý thực hiện.

  • Đội công nghệ cao

    Khảo sát địa vật lý tổng hợp trong giếng đang khoan. Đo địa vật lý tổng hợp, bắn mìn.

  • Đội Kiểm tra công nghệ khai thác

    Có nhiệm vụ là đo khảo sát và kiểm tra công nghệ khai thác trong các giếng khai thác và bơm ép.

  • Đội Carota khí

    Đội Carôta khí có nhiệm vụ chính là khảo sát carota khí, cung cấp kịp thời các số liệu để xác minh trữ lượng, tình trạng các giếng khoan.

  • Đội thử vỉa

    Đội có nhiệm vụ thử vỉa ở các giếng khoan nhằm định hướng cho công tác khoan, xác định tình trạng và đo vỉa, cung cấp thông tin để xác định trữ lượng công nghiệp của giếng



Sản phẩm dịch vụ

Mud Logging Unit ALS-2


      1. Introduction:

The ALS-2 Mud Logging Unit provides highly automated monitoring of the entire drilling operation. More than 70 parameters can be measured, processed, displayed, printed and recorded simultaneously. The acquisition system also calibrates the received signals and checks the state of the sensors for electrical faults such as a cut cable or open circuit. In the case of malfunction, an alarm is activated immediately alerting the operator.

For data processing a totally new concept has been adopted based entirely on computer technology. The sensor signals are transformed into digital format and then distributed according to requirement. The data is supplied on screen monitors (two types of screen system exist, the “Alpha-numeric” and the “Graphic”) or intelligent interfaces in real-time or playback mode. Alarms can be placed on each parameter. Computerized printouts of desired parameters produce graphic charts of the progress of the well being drilled. In addition the database is continually recorded on magnetic storage support.

The ALS is a powerful tool that may be placed in the hands of those with responsibility for the drilling rig. Using many forms of data presentation in the logging unit, monitors or intelligent interfaces can be placed anywhere on the rig. These terminals are “operator friendly” and enable anybody who needs information to have it right there in front of him in real-time or replay mode, and to apply analysis programs if necessary.

Off-line processing: An offline workstation is part of the ALS-2. This workstation has the following main functions:

  •  Calibration of the sensors.
  • Off-line calculations:

- Overpressure

- Hydraulics (Bingham, Power Law and other models)

- Deviation survey analysis

- Surge & Swab

- Drilling bit optimization

- Bit performance and cost

- Kick control

- Gas ratio analysis + plots

  •  Data handling (graphic playback, log processing, import/export...)
  • Diagnostic functions and network management.
  • Reporting capabilities (word processing, graphics editor...)
2. Mudlogging equipment and services:

2.1 Mudlogging Unit:

Mudllogging unit for offshore operation, complete with:

  •  Air-condition System
  •  Working area for client
  •  Full UPS System to support all computers and data acquisition system
  •  Airlock/Escape Hatch/MCT Entry
  •  Pressurization system
  •  Safety Equipment
  •  Intercom system
2.2  Formation evaluation equipment:
  •  Binocular Zoom (10 x 30) microscope
  •  UV Fluoroscope
  •  Sample Drying Oven
  •  Geological Equipment and Chemicals
  •  Sample Processing Trays
  •  Shale Density
  •  Autocancimeter
2.3       Gas detection system:

The FID (Flame Ionization Detector) Gas Detector & Chromatograph is a well site gas detection and analysis system. It continuously analyses gases extracted from the degasser.

  • Measurement of total hydrocarbon gases in methane equivalents, with:
  •  Measuring range: 250 ppm -100 %
  •  Sensitivity: 200 ppm
  •  Accuracy: 100 ppm
  •  Calibration method: Manual
  • Automatic chromatographic analysis of gas components (from C1 to nC5 measured in 240 seconds), with:
  •  Measuring range: 30 ppm -100 %
  •  Sensitivity: 20 ppm
  •  Accuracy: 10 ppm
  •  Calibration method: Manual injection.

2.4   Sensors and parameters:

Continuous analog recording on colour recorders and digital display on colour monitor of:

  • Drilling rate, heave, depth, bit depth, TV depth, kelly height, hook height, footage, bit run, time on bit
  • Weight on bit, hook load and over pull
  • Individual pit volume and Totaliser (all active pits, trip tank and other pits)
  • Pump rate and Totaliser (Flow in pumps), Lag time
  • Standpipe Pressure, Well Head Pressure, Cement Unit Pressure
  • Rotary RPM and Rev counter
  • Mud temperature In/Out
  • Rotary Torque
  • Mud Flow Out
  • H2, H2S, CO2

2.5 Computer equipment

Computer equipment consisting:

  • Signal Conditioning Panel (SCP)
  • Data Acquisition Panel (DAP)
  • Real-time Monitoring Computer (RTM)
  • Real Time Graphic Computer (RTG)
  • Unit File Server (SVX)
  • Off-line Computer (TDX)
  • Real-time Printers
  • Off-line Printer
  • Repeater Monitor (for Coman & Rig floor)
2.6 Reporting:
  • Reporting Daily Geological/Drilling Reports
  • Reporting Daily Master Log/Over Pressure Log
  • Submission of Client Approved Master Log, Pressure Evaluation Log (D-exponent).
  • Submission of Client Approved Final Well Report at the end of each well.

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Bridge plug and packer setting

  • Specifications

O.D in/mm


Weight Lb/ft Min I.D in/mm Max I.D in/mm Max O.D in/mm Base



5-1/2 139,7 20.0 -23.0 4.625 117,48 4.778 121,36 4.50 114,3 45 WRP-A
6-5/8 168,28 28.0 - 32.0   5.610 142,49 5.921 150,39 5.484 139,29 45 WRP-F
7 177,8 26.0 - 29.0 6.136 155,86 6.276 159,41 5.968 151,59 47 WRP-B2
7-5/8 193,68
20.0 - 24.0 7.025 178,44 7.125 180,98 6.812 173,02 47 WRP-D4
9-5/8 244,48 40.0 - 47.0 8.681 220,50 8.835 224,41 8.437 214,30 51 WRP-A4

The Weatherford WRP is a wireline set, packer type, retrievable bridge plug capable of holding differential pressure from above or below. Utilizes standard wireline or hydraulic setting tools. Used as a temporary bridge plug for acidzing, fracturing, cementing, casing pressure tests, wellhead replacement and zone isolation.

  • Pressure rating
Retrievable bridge plugs  
4-1/2” to 7-5/8”   10,000 psi   8,000 psi  
9-5/8”   8,000 psi   6,000 psi  

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The Data Processing Software for the Sondex Multi-Finger Imaging Tool (MITpro software) performs the task of processing MIT raw data automatically, but under interactive user control. It reduces the tedium of manually   analysing   the   data, producing consistent, reliable reports showing where and to what degree the pipe wall is damaged or scaled.

The software locates

collars in tubing or casing, using a range of specialised, automatic search algorithms. The results can be modified interactively, until a suitable description of every joint is obtained.

To process the data, the software uses algorithms, which correct for tool decentring and fit the interior shape of the pipe locally. All deviations from the fitted shape are merged and classified into damage reports. The software configuration can be adapted to process the data from any type of survey, using any Sondex MIT tool.

MITpro can generate highly reliable and consistent survey reports, which are stored as

ASCII format disc files. These include Summary Report Files, which summarise the findings as a Joint Tabulation, and Process Report Files, which contain detailed damage information.

The Summary Report can be printed out, to a high presentation standard, suitable for offering to end-users directly. Worst-case cross section plots can be generated and appended to the report automatically. Both metric and imperial formats are supported throughout.

The MITpro software is a 32-bit application, which runs under Microsoft Windows 95 or Windows 98. The software can also run under Windows NT.





        Cross-sections produced by MITPro are very important to know the real status of the pipe in the well. MITPro has therefore been widely used in casing and tubing inspections in L & TD – VSP. These cross-sections combine with plots, produced by WellCAD and MITView software and are the most effective ways of showing pipe status.

Some pictures below were taken from the casing and tubing inspection results.  Data source was recorded by MIT (24,40,60) tools in White Tiger oil field.

  • In this case, the casing was strongly deformed
  • This image illustrates that the casing was parted.The measured value from all of fingers exceed the nominal outer radius of the casing
  • Solid material adhering to the inside of pipe

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Mud Logging

     1. Introduction

         The Mud Logging Team of Logging & Testing Division is an operation unit with function to carry out mud logging services in almost wells of VSP. We have also performed mud logging services for some companies such as PIDC, PVEP, VRJ with many exploitation and exploratory wells. The Mud logging services are performed in either drilling process or workover operations with the possibility to fullfil following functions: to monitor and control drilling operations, to collect geological data, to increase drilling safety.

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High Resolution Induction

HRI Tool specification
Deep Medium Shallow
Max Temp
3500F (1750C)
Max Press
20 000 psi (137 900 kPa)
Max hole
4 in (102 mm)
Min hole
24 in (610 mm)
0.1 to 2000 ohm.m
Vertical Resolution (90%)
12 or 24 in30.5 or 61 cm 12 or 24 in(30.5 or 61 cm)
<17 in (<43cm)
Depth of Investigation (50%)
91 in 231 cm 39 in(99.06 cm)

<17 in (<43cm)


±0.25 ohmm

±0.25 ohmm


± 1% or ± 1 ohmm ± 1%or ± 1 ohmm


Depth of Investigation (50%
3 to 20 ft 1 to 3m
± 2%
    Primary Curves
HRd, HRm, DFL, HR90, HR60, HR50, HR40, HR30, HR24
   Secondary Curves
     Commercial Performance In Today’s Search for Hydrocarbons. The High Resolution Induction log from Halliburton offers superior vertical resolution and significantly greater depth of investigation than conventional induction logs. The HRI tool produces three primary measurements: a deep induction (HRd), a medium induction (HRm), and a digitally focused resistivity (DFL). Reading 40% deeper than ILd measurements, HRd measurements can resolve beds as thin as two feet and are accurate in beds thicker than three feet. The HRd, HRm, and DFL all have similar vertical resolution. Our innovative processing provides a log in real time, at the wellsite. Plus the HRI’s symmetric array provides a more robust, error-free log.
            As the search for new oil and gas resources contin­ues, more and more explo­ration and development is targeted toward so-called unconventional reservoirs. Drilling objectives include interceded sand-shale sequences, thin beds, low-resistivity pay sands, and beds with little resistivity contrast from their sur­roundings. While the detection and evaluation of many of these reservoirs often exceed the capabili­ties of conventional resis­tivity devices, significant technical advancements allow HRI tools to locate and provide accurate information about such zones, which may otherwise be bypassed

                 Thin beds

Reservoir intervals less than 10 feet thick comprise numerous primary and secondary exploration and development objectives. Utilizing reduced shoulder bed effects and improvements in vertical response, HRI logs resolve beds as thin as 2 feet. 

                 Laminated Sand-Shale Sequences

Marine depositional environments and fluvial flood plains commonly contain laminated sand-shale sequences. Decreased shoulder response and improved vertical resolution again enhance interpretation in these situatio

               Additional Secondary Objectives

By detecting thin beds and using quadrature processing to improve tool response, HRI logs can locate additional, potentially productive zones not indicated by other logging devices. While some primary objectives may not require HRI advantages for evaluation, HRI logs can illuminate secondary production possibilities for completion attempts. Without HRI information, numerous profitable secondary objectives could be permanently overlooked.

Groningen-Effect Environments

Below massive, highly resistive formations, deep laterolog devices read abnormally high resistivities. This phenomenon is known as the Groningen-effect and normally masks any productive zone below the massive resistive bed. HRI logs display no Groningen-effects.

Oil-Base Muds

Focused resistivity devices such as laterolog, spherically focused, and microspherically focused tools are designed to operate in an electrically conductive borehole medium and thus do not function effectively in oil-base muds. This requirement is not applicable to HRI tools; consequently, they are able to operate in oil-base muds and air-filled boreholes.


Deeper water exploration targets and many land prospects commonly include turbidites, which are high-energy submarine depositional environments encountered near continental shelf margins. The superior vertical resolution offered by HRI measurements can improve the evaluation of thin beds contained in turbidite sequences.

Deep Invasion

Typically, deeply invaded formations are associated with moderate permeability, medium to low porosity, high-water-loss muds, overbalanced mud systems, and drilling operations in pressure-depleted reservoirs. By investigating 1.4 times deeper than conventional induction devices, the HRI tool explores past the invaded zone to improve true resistivity measurement accuracy.

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Casing Inspection CAST-V

             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 cased holes, ultrasonic pipe inspection and cement evaluation can now be obtained simultaneously. In open holes, the CAST-V provides complete borehole imaging for accurate formation evaluation.


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




 Pressure Rating






3.625 in.

215 in.

316 lb


137900 kPa

92 mm


143 kg

Casedhole Operation

Recommended Range of Casing Sizes* 51/2 to 133/8 in. 139 to 340 mm
Azimuthal Resolution
Vertical Sample Rate
6 in. / 3 in. / 1 in.
Logging Speed
60 ft/min / 30 ft/min / 10 ft/min
Primary curves Reflected Amplitude, Radius, Acoustic Impedance, and Casing Wall Thickness
Secondary curves
Deviation, Relative Bearing, Compressive Strength, Fluid Transit Time, and Mud Impedance

Primary applications include:

  • Casing Inspection (Both Thickness And Diameter).
  • Ultrasonic Cement Evaluation Imaging.
  • Open Hole Borehole Imaging.
  • Fracture Detection.




   CAST-V has been used by Vietsovpetro L&TD for casing inspection and cement evaluation.    

   Cased hole diagnostic applications provide the following information:  

            - Detailed radial caliper information, precise perforation location,  

            - Casing damage inspection, corrosion effects description, real pipe wear identification.

                - Evaluation of complex and lightweight cement

   This plot of casedhole logs displays VDL in Track 3 and Impedance map in Track 5. They clearly indicate that interval 2440-2532 m, cement bonding is poor, the lower shows good bonding.
   This plot of casedhole logs displays I.D map in Track 4 and Thickness map in Track 6. They clearly indicate corrosions in interval 1060-1100m

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Downhole Pressure Measurement



For high precision downhole pressure measurement, we use Sondex quartz pressure gauge tool, employing an industry standard quartz crystal pressure transducer. The tool provides both pressure and gauge temperature outputs.




Fluid pressure applied to the quartz tension member changes the resonant frequency of the quartz crystal. Thermal compensation of the sensor and measurement of its temperature allows the calculation of very accurate, high-resolution downhole pressures.

Pressure readings are digitized to 24-bit resolution and gauge temperature to 16 bits and transmitted on one channel of the telemetry system simultaneously with other logging signals. In surface readout applications two pressure tools can be used with output from both tools transmitted in a single digital channel.



  Memory Wireline
Supply Voltage +12V DC +60V DC
Power / Current 5 mA 50 mA
Max. Pressure 15,000 psia
Max. Temp. 3500 F (1770 C)
Drift Less than 3 psi per year
Tool Length 12.25" (311mm) 22.5" (572mm)
Measure Point 2.9" (74mm)
Tool Diameter 1-1/2" (38mm)
Weight 4.85 lb (2.2kg)
6.5 lb (3kg)
Range 0-15,000 psia
Linearity ≤  0.01 % FS
Resolution 0.008 psi
Repeatability ≤  0.01 % FS
Hysterisis ≤  0.01 % FS
Materials Corrosion resistant throughout



  • Downhole pressure gradient measurement.
  • Evaluating the multiphase production profile.
  • Draw down and build up pressure transient analysis
  • Data for productivity index and Nodal Analysis.
  • It could be used in horizontal or highly deviated Wells
The study of hydrodynamic characteristics is one of the most important methods to monitor production life of reservoir. It consists of:
  • Reservoir pressure monitoring helps in optimizing primary production regime and enhanced production regime. In addition reservoir pressure is to be used in reserves assessment by material balance
  • Evaluation of reservoir permeability and skin effect of region around the wellbore. The can then be used to determine the technical solution such as acidizing fracturing works
  • Determination of present oil-water contact.

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Super Tubing Cutters

· Benefits & Features 

- Tubing cutter is always shot between two collars. Operatinally very simple

- Cutting by tubing cutter will not damage casing

  •   Specifications 
Item Description
1 Adapter Sub, Box to Pin Connection
2 Housing
Cablehead Boot
Splice Boot
O-Ring, Viton
        6          Rubber Retainer
Tubing Cutter Assemblies
Charge No 1-hr Temp °F Press. Rating (psi) Explo -sive


Cutter O.D (In) Tubing Nominal (In) Tubing O.D. (In) Tubing I.D. (In) Tubing Weight (wt/ft)
CUT-2125 -405 400 17,000 50 2.125 2-7/8 2.875


6.50 #


Resistorized Detonator - (not included)

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          One of the most effective ways of understanding the condition of a well is to produce 3D images. To achieve this, we use a package called MITview

This powerful presentation package uses the ASCII files of data recorded by an MIT to produce 3D images on a PC screen. These images are under user control and can be manipulated to give a view that best suits understanding the nature of a feature. All the views use a combination of false colour and position to give pictures where diameter changes are shown as variations in colour & shape. During MITview use the initial visualisation generated is normally a view straight down the well; the result is an image similar in appearance to that seen when using a Downhole Video Camera. The difference is MITview has no problem with well fluid turbidity and additionally provides a quantified output. On screen controls provide the ability to add a number of useful measurement aids. The value of each arm reading can be displayed enabling dimensioned cross-sections to be examined. A grid of nominal O.D. can be superimposed, this allows excursions that are probable penetrations to be rapidly identified. "Whiskers" can be automatically drawn to represent anomalies in a vector like form with lines representing the magnitude and direction of a feature.

While views down the well are very informative, MITview can be used to allow the operator to look at features from different directions. Full control of the displayed image allows it to be angled, rotated, lengthened etc. This often makes the understanding of a downhole problem easier. Longitudinal sections are also available.

           MITview users are able to produce a CD for their customer with the data  fil  e  s of a particular job together with an operating version of the program. This allows the engineer responsible for the well to run MITView and examine the data himself

           Exported images can be used to produce hard copy pictures suitable for use in written reports, for example the BOP shown on the right. 

Some pictures below illustrate this software application in Vietsovpetro L&TD. Data was recorded by MIT (24,40,60) tools in White Tiger oil field.
  •  A specific image of mandrel in tubing inspecting results



  • This picture shows the scale build up phenomenon in tubing and casing in a well
  • MITView showing a casing, which was wom by drilling towhichol

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Vsprowess Software

Main Features

Three component processing of any survey configuration

Image reconstruction of P and S wave modes, both CDP mapping and migration, using simple dip, anisotropic models.

Time slice display of 3D datasets

Proximity surveys including anisotropy and simple dip

Q estimation

Wavelet extraction/matching

AVO/AVA analysis tools

Fracture monitoring display

Flexible display options

Input data formats include SEGY,SEG2 and MIRF

Velocity log calibration and synthetic seismogram

Import and display of LAS logs.

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