Self-selection flow division blockage removal system for overcoming interlayer contradiction of sandstone reservoir and application method of self-selection split-flow blockage removal system

A self-selection and plug-removing technology, which is applied in chemical instruments and methods, earthwork drilling, and drilling compositions, can solve problems such as rising water content of benefited oil wells, reducing repeated acidizing efficiency, and intensifying conflicts between layers, achieving The effect of alleviating the rapid rise of water content, convenient construction, and alleviating conflicts between layers

Active Publication Date: 2021-07-27
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-selection flow division blockage removal system for overcoming interlayer contradiction of sandstone reservoir and application method of self-selection split-flow blockage removal system
  • Self-selection flow division blockage removal system for overcoming interlayer contradiction of sandstone reservoir and application method of self-selection split-flow blockage removal system
  • Self-selection flow division blockage removal system for overcoming interlayer contradiction of sandstone reservoir and application method of self-selection split-flow blockage removal system

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0040] The preparation method of the self-selective split-flow plugging removal system is: weighing each component of the self-selective split-flow plugging-removal system according to a preset ratio, adding multifunctional self-selective split-flow plugging removal agent, composite plugging removal agent, ion stabilizer Agent, clay stabilizer and water, mixed and stirred evenly to obtain the self-selective split flow plugging removal system.

[0041] The temperature of the mixing and stirring is 20-40°C, and the time is 4-6h. Due to the self-selectivity of the components of the multi-functional self-selective split-flow plug-removing agent, the self-selective split-flow plug-removal system provided by the present invention can combine multi-functional self-selective split-flow plug-breaker, composite plug-breaker, ion stabilizer, clay stabilizer and The water is mixed first and then injected into the water injection well for plugging removal. The multifunctional self-selectiv...

Embodiment 1

[0052] The present invention is used to improve the self-selective flow splitting and plugging removal system for improving the conflict between sandstone reservoir layers, and its components and weight percentages are as follows:

[0053]

[0054] Among them, the multi-functional self-selective shunting and plugging agent includes a mixture of 28 parts of modified betaine-type amphoteric surfactants, 28 parts of fluorocarbon surfactants, 25 parts of methyl silane, 10 parts of triethanolamine, and 9 parts of aldehyde and ketone condensates The modified betaine type amphoteric surfactant structural formula is as follows (R is 12, n is 3):

[0055]

[0056] The composite plugging agent is one of industrial hydrochloric acid (31%-33% by mass fraction), industrial acetic acid, hydrofluoric acid (50% by mass fraction), fluoboric acid (50% by mass fraction), polyhydric acid or various mixtures;

[0057] The ion stabilizer is a mixture of D-isoascorbic acid, citric acid, gluco...

Embodiment 2-5

[0062] Compared with Example 1, the self-selective split-flow plugging removal system provided in Examples 2-5 for improving the conflict between sandstone reservoir layers is different in that the multi-functional self-selective split-flow plugging remover, composite plugging remover, The composition ratio of the ion stabilizer, the clay stabilizer and water, as well as the preparation temperature and time are shown in Table 1, and the others are roughly the same as in Example 1, and will not be repeated here.

[0063] The composition ratio and preparation conditions of Table 1 Embodiment 2-5

[0064]

[0065] Construction effect statistics

[0066] The self-selective split flow plugging 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 plugging removal are shown in Table 2. It can be seen that after the plugging removal measures, the water injection pressure has decreased, the water injection ...

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Abstract

The invention discloses a self-selection flow division blockage removal system for overcoming the interlayer contradiction of sandstone reservoirs and an application method of the self-selection flow division blockage removal system. The self-selection flow division blockage removal system comprises 20-30 parts by weight of a multifunctional self-selection shunting blocking remover, 60-70 parts by weight of a composite blocking remover, 3-5 parts by weight of an ion stabilizer, 3-5 parts by weight of a clay stabilizer and the balance of water. The multifunctional self-selection shunting blocking remover is prepared from a modified betaine type ampholytic surfactant, a fluorocarbon surfactant, methylsilane, triethanolamine and an aldehyde ketone condensation compound. The self-selection flow division blockage removal system is applied to acidification plug removal of a water injection well, is particularly suitable for sandstone reservoirs with prominent interlayer contradictions, can achieve the dual effects of pressure reduction and injection increase and water absorption profile improvement at the same time through self-selection flow division plug removal, and has the advantages of being convenient and fast to construct, safe, stable in measure effect and the like.

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 conflicts between sandstone reservoir layers and an application method thereof. Background technique [0002] When the oilfield development enters the middle and late stages, the energy of the formation is attenuated, the recovery rate is reduced, and the contradiction between layers is prominent. In order to ensure the stable and increased production of the oil field, a large amount of surface water is squeezed into the oil layer through the water injection well in the field operation to replenish its energy due to production deficit, restore and stabilize the reservoir pressure, and finally achieve the purpose of increasing the production speed and recovery factor of the reservoir. During the long-term water injection process, due to external fluid pollution, the water injection pressure will gr...

Claims

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Application Information

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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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