Analyzing method for rock core water containing saturability

An analysis method and saturation technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of long test cycle, complicated process, and many parameters, and achieve the improvement of interpretation compliance rate, simple calculation method, Analyze Rapid Effects

Inactive Publication Date: 2008-01-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the many parameters required, many supporting equipment, complex process, and long test cycle, it cannot meet the needs of on-site rapid analysis.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055]A 2cm core sample was taken from layer 89 of well G80 in an oilfield 3 , put in a container filled with 10mL deionized water and soak for 24 hours. The ion meter is ELIT type, the chloride ion electrode is ELIT8261 type, the reference electrode is 002N type, and the temperature sensor is 8701 type. They are connected together as required, and the measured chloride ion concentration is 31mg / L. Borrowing the known data of neutron porosity of 14.7% and 3422 mg / L chloride ion concentration of adjacent well formation water, the water saturation of the core sample is calculated to be 31%. It reflects that the layer contains less water, and the possibility of water production is very small, which is interpreted as a low aquifer. It is verified by oil testing that the daily oil production is 0.02t and no water is produced. It shows that the water saturation calculated by the present invention is consistent with the actual situation of the formation.

Embodiment 2

[0057] A 2cm core sample was taken from layer 65 of Well Y45 in an oilfield 3 , put in a container filled with 10mL deionized water and soak for 24 hours. Apparatus used is the same as in Example 1. The measured chloride ion concentration was 79mg / L. Using the well-logged neutron porosity of 12.7% and the known data of 3350mg / L chlorine ion analysis in adjacent well formation water, the water saturation of the core sample is calculated to be 93%. It reflects that this layer contains a lot of water, and the possibility of water production is very high. It is interpreted as a high water-bearing layer, and the oil test proves that it is a low-oil-producing water layer (daily oil production 0.59t, water 2.28m3). It shows that the water saturation calculated by the present invention is consistent with the actual situation of the formation.

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Abstract

The invention relates to the oil-gas geological field, in particular to the analysis on rock core for well drilling and prospection. First, a rock core sample is crushed and placed into a test cylinder, soaked by some de-ionized water, the concentration of Cl ion in the leaching liquid is determined, then the water saturation of the rock core is calculated by a formula. The invention is easy to operate, rapid to analyze, can meet the requirement for rapid analysis on water saturation at the drilling and prospecting site, and is of important meaning for in-situ rapid identifying and evaluating oil-gas layer, improving the compliance in explanation of oil-gas water layer. The invention is for prospecting oil and gas fields.

Description

technical field [0001] The invention relates to the field of oil and gas geology, in particular to the analysis of drilling exploration cores. Background technique [0002] Core water analysis is very important first-hand information in geological exploration and drilling geological work. The mud logging operation at the drilling site is different from some operations and analysis methods in the laboratory, and it is almost required to be synchronized with the drilling speed in order to obtain effective analysis data. Based on this particularity and taking into account the convenience of operators, the water content analysis method of rock core must have the characteristics of easy operation and rapid analysis. [0003] At present, there are water drop test method, distillation method, chromatography method and microwave method in core water analysis. [0004] The drip test method is currently the most widely used method in the field. It mainly judges the water content of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/26G01N1/28G06F19/00
Inventor 鲍云杰
Owner CHINA PETROLEUM & CHEM CORP
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