Formation Evaluation

Our Formation Evaluation solutions provide clients with data that enables them determine the ability of a borehole to produce oil and gas in commercial quantities. Our unique SMART (Selective Modular Array Reservoir Evaluation Tool) formation evaluation system offer operators the opportunity to acquire a full complement of formation evaluation information delivered to the office in real time or without wireline. Oildata’s openhole formation evaluation tools and services are flexible to allow multiple combinations of all tool sensors such that the only one run in hole is required thereby saving rig time. The system is portable and can be run off any third party wireline.

Technology/tools deployed for these services provide the following information;

• Lithology Identification and Characterization
• Formation Sampling
• Fluid characterization and testing

Oildata’s Lithology identification and characterization tools include; 

• High Speed Digital Transmission/GR (HDT/GR):

The Gamma Ray Tool (GRT) measures the natural radioactivity of the formation. These measurements provide lithological identification, definition of clay content, depth control, reservoir delineation, well-to-well correlation, and the correlation between different logging runs. The high-speed digital telemetry sub adopts the OFDM modem technology, the QAM up-linking technology (with a max up-linking rate of 560kbps), and the DQPSK down-linking technology (with a max down-linking rate of 220kbps), and it works in the half-duplex mode. This sub is equipped with a 800kbps CAN data bus, a non-magnet pressure-bearing titanium steel housing, and follow-up measurement circuits for GR detector, cable head tension, mud resistivity, and magnet positioning, etc.

• Natural Gamma Spectrum (NGS):

Keep records of the formation Gamma-ray energy distribution, assess contents of formation elements – potassium, uranium and thorium, and determine the reservoir Lithology in the borehole and casing wells using our Natural Gamma Spectrum Well Logging Tool (NGS).

• Compensated Neutron (CNS)

Obtain hydrogen content measurements of the formation surrounding the wellbore, determine hydrogen content relating to porosity and gas detection both open and cased hole applications using the Compensated Neutron (CNL) tool

• Litho Density Logging Tool (LDS)

The Lithology Density Logging Tool (LDS) is used to measure the bulk density of the formation, which is then related to formation porosity. By adopting Gamma spectral analysis, Litho-density Logging Tool distinguishes Compton scattering from electro-optical effect, tests the electron density and photoelectric absorption index so as to identify the bulk density and lithological characteristics of the formation. It also measures caliper for borehole correction. The tool provides the following curves: Compensated Density Curve (DEN), Density Correction Curve (CORR), Photoelectric Absorption Cross-section Index Curve (Pe), Caliper Curve (CAL).

• High Resolution Digital Acoustic Logging (HRDA)

This service provides quality broadband compressional measurements of both hard and soft rock formations. The HRDA tool helps to assess/confirm formation porosity. Shear information may be obtained for the assessment of formation mechanical strength and integrity.

• X-Y Cross Dipole Array Acoustic Wave Well Logging Tool (XDAT)

The X-Y Cross Dipole Array Acoustic Wave Well Logging Tool (XDAT) combines monopole and dipole sonic acquisition capabilities. The transmitter section contains a piezoelectric monopole transmitter and two electro-dynamic dipole transmitters perpendicular to each other. An electric pulse at sonic frequencies is applied to the monopole transmitter to excite compressional- and shear-wave propagation in the formation. For Stoneley wave acquisition a specific low-frequency pulse is used. The dipole transmitters are also driven at low frequency to excite the flexural wave around the borehole.

• Sidewall Coring (SCOR)

Acquire undamaged sidewall core samples suitable for porosity and permeability analysis using our Sidewall Rotary Coring (SCORSM) instrument. Our SCORSM is an advanced, computer controlled and hydraulically powered coring device for cutting and retrieving multiple sidewall cores – we continuously monitor this operation by means of a graphical system. The entire coring and storage provides the ability to acquire undamaged sidewall core samples suitable for porosity and permeability analysis.

• VSP

VSP measurements are made in a vertical wellbore using geophones and a source at the surface near the well.  VSPs include the Zero-offset VSP, Micro point Zero-offset VSP, Offset VSP, Walk away VSP, Cross well Seismic

• Hexagonal Dipmeter (Hdip)

The Hexagonal Dipmeter (HDIP) is an electric logging tool that provides data used to compute formation dip. It provides formation micro-resistivity measurements, tool orientation data, and caliper curves. The micro-resistivity measurements are taken around the borehole. This data is then correlated to identify bedding and other features in the formation.

Oildata’s Fluid Characterization and Testing Tools include;

• Dual Laterolog (DLLSM) service:

Determine hydrocarbon saturation, delineate thin beds, and identify formation fluid contacts within the reservoir. The Dual Laterolog (DLLSM) service provides a reliable means of measuring formation resistivity in conductive borehole fluids under harsh downhole conditions. 

• High Frequency Array Induction (HFAI) Tools:

Measures the open hole formation conductivity at five depths of investigation, and can offer legacy deep, medium and Spontaneous Potential (SP) curves.

• Micro Spherically Focused/micro-electrode tool (MFS/MET):

The MSFL tool is a pad-type miniature version of the SFL (Spherically Focused Log) which was developed to eliminate borehole effects and achieve superior shallow investigation. The MSFL tool is a stand-alone logging tool that is wired to be placed anywhere in the logging tool string. Included in the MSFL tool string is a ML log that makes two resistivity measurements, a 2-in. normal and a 1.5-in. lateral. A caliper measurement of the borehole is also provided along with the MSFL tool log. 

• Repeat Formation Tester (RFT)

The Repeat Formation Tester (RFT) measures wellbore and formation fluid pressure at any point in the well with a petroquartz pressure transducer. The RFT tool can also collect representative formation fluid samples for up to two test depths in one trip into the well.

• Compensated Neutron (CNS)

Obtain hydrogen content measurements of the formation surrounding the wellbore, determine hydrogen content relating to porosity and gas detection both open and cased hole applications using the Compensated Neutron (CNL) tool

• Litho Density Logging Tool (SMT-LDT)

The Lithology Density Logging Tool (LDS) is used to measure the bulk density of the formation, which is then related to formation porosity. By adopting Gamma spectral analysis, Litho-density Logging Tool distinguishes Compton scattering from electro-optical effect, tests the electron density and photoelectric absorption index so as to identify the bulk density and lithological characteristics of the formation. It also measures caliper for borehole correction. The tool provides the following curves: Compensated Density Curve (DEN), Density Correction Curve (CORR), Photoelectric Absorption Cross-section Index Curve (Pe), Caliper Curve (CAL).

• Nuclear Magnetic Resonance (NMR) Logging

With this service, you can:

Find out if your wellbore has penetrated the reservoir rock; determine the effective porosity in a complex Lithology environment.

• Identify the types and distribution of hydrocarbon fluids present in your reservoir
• Ascertain the ability of your reservoir to produce these hydrocarbons/ determine permeability.
• Determine the possibility of associated water production from your reservoir.

The MRIL-XL and MRIL-Prime tools directly measure the magnetic resonance of hydrogen atoms in fluids. Amplitude of the measured signals gives porosity, whereas the actual signature carries information on rock properties and fluid characteristics.

Our Formation Sampling tools include;

• Sidewall Coring (SCOR)

Acquire undamaged sidewall core samples suitable for porosity and permeability analysis using our Sidewall Rotary Coring (SCORSM) instrument. Our SCORSM is an advanced, computer controlled and hydraulically powered coring device for cutting and retrieving multiple sidewall cores – we continuously monitor this operation by means of a graphical system. The entire coring and storage provides the ability to acquire undamaged sidewall core samples suitable for porosity and permeability analysis.  

The Repeat Formation Tester (RFT) also collects representative formation fluid samples for up to two test depths in one trip into the well.