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Method for simultaneous removing oil and salt in rock core

A core and crude oil technology, applied in the field of simultaneous oil and salt removal, can solve problems such as low work efficiency, long extraction time, personal injury, etc., and achieve the effects of improving work efficiency, saving salt washing time, and improving safety

Active Publication Date: 2009-04-01
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantages of using this degreasing and desalting method: take samples twice; take a long extraction time, which takes 120-144 hours; approximately 100% methanol solvent, which is a highly toxic substance, is extremely volatile, and has great harm to people sex
Therefore, it is laborious to remove oil and salt from oil-bearing rocks with high salinity, and the work efficiency is low, which may easily cause personal injury

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0006] Below in conjunction with experiment the present invention is further described: for verifying the effectiveness and the feasibility of one-step degreasing and desalting method, method experiment has been carried out: select a batch of high salinity oily samples 690 pieces, sample quality is generally 15~30g, sample The water content is generally 0.2-1.4mL (the amount of water content in the sample is related to lithology, oil content, sample size and other factors), divided into two groups, 345 pieces in each group, and using the above two methods to remove oil and salt in batches. The step-by-step degreasing and desalting experiment is as follows: first use ethanol-benzene 1:3 solution to remove oil, then use methanol-benzene 1:1 solution to remove oil and desalt, and then use methanol 100% solvent to desalt; The mentioned step-by-step degreasing and desalting difference lies in the addition of a methanol-benzene 1:1 solution degreasing and desalting experiment, the pu...

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PUM

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Abstract

The invention discloses a method for simultaneously removing oil and salt in a rock core. The method comprises the following steps: a solvent with a proportion of methanol to benzol equal to 1 to 1 is adopted; a Soxhlet extractor is utilized for removing oil and salt by extraction; and the crude oil and salt in the voids of the rock core can be removed simultaneously through extraction for 60 hours to 72 hours. The method reduces the consumption of ethanol and methanol, improves working efficiency, reduces the toxicity of the methanol solution and improves safety.

Description

Technical field: [0001] The invention relates to a method for simultaneously removing oil and salt used in the field of oil field exploration and development testing and other fields, in particular to a method for simultaneously removing oil and salt in rock cores. Background technique: [0002] In oilfield exploration and development technology, to study reservoir rock physical properties such as rock porosity, permeability, saturation, etc., it is necessary to remove crude oil and various salts in rock pores. The method used in the past (called the step-by-step deoiling and desalting method) is to use a 1:3 solution of ethanol and benzene to extract it through a Soxhlet extractor for 60 to 72 hours to remove the crude oil in the core, and then dry it. Then put into a Soxhlet body extractor with methanol as the solvent, extract for 60-72 hours, and remove the salt in the core pores. Disadvantages of using this degreasing and desalting method: take samples twice; take a lon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00G01N1/34
Inventor 刘玉曲斌张志宏刘凤霞李芝华孔祥鹏田宇新
Owner PETROCHINA CO LTD