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Self-selective diversion and plugging removal system for improving the contradiction between sandstone reservoirs and its application method

A self-selecting and plug-removing technology, applied in the fields of chemical instruments and methods, earth-moving drilling, drilling composition, etc., can solve the problems of rising water content of benefited oil wells, reducing the efficiency of repeated acidification, aggravating the contradiction between layers, etc. The effect of alleviating the rapid rising trend of water content, convenient construction, and alleviating the contradiction between layers

Active Publication Date: 2022-07-01
河北峻极化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the fast acid-rock reaction speed and strong matrix acidification ability of conventional acidification plugging removal measures, while removing plugging, the contradiction between layers will be further aggravated, resulting in reduced repeated acidification efficiency, shortened validity period, and water injection "burst" and "channeling". Benefit from the rapid rise of water cut in oil wells

Method used

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  • Self-selective diversion and plugging removal system for improving the contradiction between sandstone reservoirs and its application method
  • Self-selective diversion and plugging removal system for improving the contradiction between sandstone reservoirs and its application method
  • Self-selective diversion and plugging removal system for improving the contradiction between sandstone reservoirs and its application method

Examples

Experimental program
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Effect test

preparation example Construction

[0040] The preparation method of the self-selective split-flow blocking removal system is as follows: weighing each component of the self-selective split-flow blocking-removing system according to a preset ratio, and sequentially adding a multifunctional self-selective split-flow blocking removing agent, a composite blocking removing agent, and an ionic stabilizer agent, clay stabilizer and water, mix and stir evenly to obtain the self-selective diversion blockage removal system.

[0041] The temperature of the mixing and stirring is 20-40° C., and the time is 4-6 h. Due to the self-selectivity of the components of the multifunctional self-selective diverting plugging remover, the self-selective diverting plugging removing system provided by the present invention can combine the multifunctional self-selecting diverting plugging removing agent, the composite plugging removing agent, the ion stabilizer, the clay stabilizer and the The water is mixed first and then injected into ...

Embodiment 1

[0052] The present invention is used to improve the self-selective shunting and unplugging system for improving the contradiction between layers of sandstone reservoirs, and its components and weight percentages are as follows:

[0053]

[0054] Among them, the multi-functional self-selective diversion blockage remover includes a mixture of 28 parts of modified betaine-type amphoteric surfactant, 28 parts of fluorocarbon surfactant, 25 parts of methylsilane, 10 parts of triethanolamine, and 9 parts of aldehyde and ketone condensate ; The structural formula of modified betaine-type amphoteric surfactant is as follows (R is 12, n is 3):

[0055]

[0056] The composite plug removing agent is one of industrial hydrochloric acid (mass fraction of 31%-33%), industrial acetic acid, hydrofluoric acid (mass fraction of 50%), fluoroboric acid (mass fraction of 50%), and polyhydrogen acid. a variety of mixtures;

[0057] The ionic stabilizer is a mixture of D-isoascorbic acid, cit...

Embodiment 2-5

[0062] Compared with Example 1, the self-selective diversion plugging removal system for improving the contradiction between sandstone reservoirs provided in Examples 2-5 is different in that the multifunctional self-selective diversion plugging removal agent, composite plugging removal agent, The component proportions of the ionic stabilizer, the clay stabilizer and the water, as well as the preparation temperature and time are shown in Table 1.

[0063] The composition ratio and preparation condition of table 1 embodiment 2-5

[0064]

[0065] Construction effect statistics

[0066] The self-selective diversion plug-removal system provided in Examples 1-5 was applied to a water injection well in a block of CNOOC, and the data before and after the plug-removal were shown in Table 2. It can be seen that after the plugging removal measures, the water injection pressure has decreased, the water injection volume has increased significantly, and the daily water injection volum...

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Abstract

The invention discloses a self-selective diversion plug-removing system for improving the contradiction between sandstone reservoir layers and an application method thereof. The self-selective diversion blocking removal system comprises 20-30 parts by weight of a multifunctional self-selecting diversion blocking removal agent, 60-70 parts by weight of a composite plugging removal agent, 3-5 parts by weight of an ion stabilizer, 3-5 parts by weight of a Clay stabilizer, the rest is water. Among them, the multifunctional self-selective diverting and blocking removing agent includes modified betaine-type amphoteric surfactant, fluorocarbon surfactant, methylsilane, triethanolamine and aldehyde-ketone condensate. The invention is applied to acidizing and plugging removal of water injection wells, and is especially suitable for sandstone reservoirs with prominent contradiction between layers. The construction is convenient, safe, and the measures are stable.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a self-selective diversion and plugging removal system for improving the contradiction between layers of sandstone reservoirs and an application method thereof. Background technique [0002] When the oilfield development enters the middle and late stage, the formation energy decays, the recovery factor decreases, and the contradiction between layers is prominent. In order to ensure the stable production and increase of oilfield production, the field operation squeezes a large amount of surface water into the oil layer through the water injection well, supplements its energy due to production deficit, restores and stabilizes the reservoir pressure, and finally achieves the purpose of improving the recovery rate and recovery rate of the oil reservoir. In the long-term water injection process, due to external fluid pollution, the water injection pressure will graduall...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/52C09K8/54E21B37/06
CPCC09K8/52C09K8/54E21B37/06C09K2208/12
Inventor 周圣张红娟杨欢
Owner 河北峻极化工科技有限公司
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