Quantitative evaluation method of imbibition and oil production effects of imbibition agent

A kind of imbibition agent and imbibition technology, which is applied in the development of fluids, earthwork drilling, wellbore/well components, etc., can solve the problems of restricting the development and optimization of imbibition agents, lack of imbibition recovery rate evaluation methods, etc.

Active Publication Date: 2014-01-15
PETROCHINA CO LTD
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the lack of a unified and convenient evaluation method for imbibition recovery also restricts the development and optimization of imbibent to varying degrees, and it is urgent to establish a corresponding evaluation method in the industry.

Method used

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  • Quantitative evaluation method of imbibition and oil production effects of imbibition agent
  • Quantitative evaluation method of imbibition and oil production effects of imbibition agent
  • Quantitative evaluation method of imbibition and oil production effects of imbibition agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] This example provides a quantitative evaluation method for the oil recovery effect of imbibition, which is the screening of imbibants in low-permeability reservoirs (permeability lower than 10mD) in the periphery of Daqing, which includes the following steps:

[0080] (1) First, mix 8 kinds of osmotic agents into the same concentration of osmotic agent solution (0.2wt%), and select aged 100-160 mesh Daqing oil sand;

[0081] (2) Use the same imbibition meter to keep warm in a 45°C thermostat to test the recovery of imbibition (according to the above-mentioned steps). The main ingredients are tridecyl dimethyl betaine ammonium salt, pentadecyl dimethyl betaine ammonium salt and dodecyl dimethyl betaine ammonium salt, these three and lauryl betaine (as Contrast) are all produced by Nantong Kaihua Chemical Co., Ltd.; the main component of A1284 is OP-6, which is alkylphenol polyoxyethylene (6) ether, produced by Xingtai Lanxing Auxiliary Factory.

[0082] (3) Compare the ...

Embodiment 2

[0087] This embodiment provides a quantitative evaluation method for the imbibition effect of the imbibition agent, which is aimed at the evaluation method of the imbibition effect of the imbibition agent in medium-high permeability reservoirs in Daqing, including the following steps:

[0088] (1) Two prepared Daqing oil sands (40-80 mesh and 80-100 mesh, crude oil density 0.8450g / cm 3 ), aging for 96 hours at 45°C;

[0089] (2) Select betaine osmotic agent TCJ18 (TCJ18 refers to octadecyl dimethyl betaine ammonium salt, produced by Nantong Kaihua Chemical Co., Ltd.), and carry out 24-hour imbibition recovery on this osmotic agent Efficiency test, the results are shown in Table 4. The imbibant solution was prepared with Daqing simulated water with a salinity of 5228mg / L), and the imbibition recovery values ​​of the prepared imbibrant solutions with different concentrations were measured;

[0090] (3) According to the evaluation content in Table 2, compare the above-mentioned ...

Embodiment 3

[0095] This embodiment provides a quantitative evaluation method for the imbibition effect of the imbibition agent, which is an evaluation method for the imbibition effect of the imbibition agent in Daqing high-permeability reservoirs, including the following steps:

[0096] (1) Select 40-80 mesh oil sands, use the imbibant JBX-1 (the main component is sodium polyacrylate, produced by Shandong Taihe Water Treatment Co., Ltd.) Carry out imbibition experiment at reservoir temperature to measure the value of imbibition recovery;

[0097] (2) The test results of 24-hour imbibition recovery are shown in Table 5;

[0098] (3) Compare the test results with the evaluation content in Table 2 to determine the effect level.

[0099] table 5

[0100]

[0101] It can be seen from the contents of Table 5 that different concentrations of imbibant solutions have different effects on the same oil sand, and there is an optimal concentration for the same oil sand. The concentration of the ...

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Abstract

The invention relates to a quantitative evaluation method of imbibition and oil production effects of an imbibition agent. The method evaluates the imbibition and oil production effects on crude oil of a target oil pool by the imbibition agent. The method includes the following steps that quartz sand or natural sand in corresponding particle size ranges is selected according to the reservoir permeability Ka of the target oil pool; the imbibition efficiency value of oil sand which is made by mixing the crude oil or simulated oil and the quarts sand or the natural sand of the target oil pool by the imbibition agent is measured; evaluation is performed on the imbibition and oil production effects on the target oil pool by the imbibition agent according to the imbibition efficiency value. The quantitative evaluation method of the imbibition and oil production effects of the imbibition agent has the advantages that the evaluation grade of the imbibition effects is given, a specific basis is provided for comparison and optimization. The method evaluates the effects of the imbibition agent and has good simulation and consistency.

Description

technical field [0001] The invention relates to a quantitative evaluation method for the oil recovery effect of imbibing agent, which belongs to the technical field of petrochemical industry. Background technique [0002] In the 1980s, the National Reserves Committee set the lower limit of the permeability of oil layers in low-permeability oilfields in my country to 0.1mD, and imbibition recovery is one of the main development technologies for low-permeability oil reservoirs. my country is rich in low-permeability reserves, which are distributed in various oil regions across the country. At present, the proven geological reserves are more than 5 billion tons, of which sandstone oil fields account for 70%, and other special lithology oil fields account for 30%. Imbibition oil recovery is still in the research and development stage in our country, and there are few applications in mines. With the progress of surfactant industry, it provides a new opportunity for the wide appli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22
Inventor 张翼马德胜刘化龙王德虎严守国
Owner PETROCHINA CO LTD
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