Formation water salinity from borehole measurements

A salinity and formation technology, applied in the field of determining the salinity of wellbore and formation water, can solve the problem of not being able to provide accurate estimates of water and hydrocarbon fractions

Active Publication Date: 2019-08-30
SAUDI ARABIAN OIL CO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, without knowledge of salinity, the instrument may not provide accurate estimates of water and hydrocarbon fractions

Method used

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  • Formation water salinity from borehole measurements
  • Formation water salinity from borehole measurements
  • Formation water salinity from borehole measurements

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Embodiment Construction

[0020] Embodiments of the present disclosure describe apparatus and methods for determining wellbore and formation water salinity from pulsed neutron gamma-ray spectroscopy measurements in the wellbore. In the following description, various aspects of the illustrative embodiments are described using terms commonly employed by those skilled in the art to convey the substance of their work to others skilled in the art. Those skilled in the art will understand, however, that embodiments of the present disclosure may be practiced with only some of the described aspects. For the purpose of illustration, specific numbers, materials, and configurations are set forth in order to provide a thorough understanding of the illustrative embodiments. However, one skilled in the art will understand that the present disclosure may be practiced without the specific details. In other instances, well-known features are omitted or simplified in order not to obscure the illustrative embodiments. ...

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Abstract

The present disclosure describes various embodiments related to methods for determining salinity of water in a borehole of a formation and the water in the formation. Various methods may use inelasticand capture gamma-ray spectra obtained from a pulsed neutron logging tool. Various embodiments may use a ratio of chlorine from a capture spectrum to oxygen from an inelastic spectrum for a near anda far detector to calculate apparent salinity ratios for water in a borehole and a formation. From the apparent salinity ratios, a borehole salinity and a formation salinity may be calculated using atool characterization database and without using formation water saturation for the calculation. Other embodiments may be disclosed or claimed.

Description

technical field [0001] Embodiments of the present disclosure generally relate to the field of downhole measurements in wellbores for hydrocarbon production. More particularly, embodiments of the present disclosure relate to methods and systems for determining wellbore and formation water salinity from pulsed neutron gamma-ray (gamma-ray) spectroscopy measurements in the wellbore. Background technique [0002] Hydrocarbons in subterranean formations may be accompanied by water. Such water can often have high concentrations of dissolved salts. After the formation is disturbed by a hydrocarbon production operation, the water in the formation may have variable concentrations of dissolved salts. This variation can vary with time and location within the formation. This variation may result from the mixing of the various aqueous fluids used during production with each other and with the water in the formation. [0003] Knowledge of the salt concentration (often referred to as s...

Claims

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Application Information

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IPC IPC(8): G01V5/10
CPCG01N33/2823G01V5/102E21B49/00
Inventor S·马内达尔·默罕默德·阿卜杜拉·阿尔穆沙尔菲巴勃罗·J·萨尔敦加赖哈罗德·普夫茨纳
Owner SAUDI ARABIAN OIL CO
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