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Acidizing block remover suitable for complex lithologic reservoir

A technology for complex lithology and reservoirs, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as unsatisfactory construction results and large differences in physical properties, and achieve the prevention of secondary precipitation, swelling and particles Migration, increase the effect of daily water injection

Active Publication Date: 2014-07-02
DAQING JINGSHENG WEIYE OILFIELD TECH SERVICE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to overcome the problems in the background technology that the lithology and physical properties of oilfields are quite different and the staggered distribution is unsatisfactory when using conventional water injection wells for acidification and plugging removal, and provides an acidification and plugging removal agent suitable for complex lithology reservoirs , the acidizing plugging remover suitable for complex lithology reservoirs has formed a series of acid liquid systems with strong pertinence, which can effectively dissolve formation minerals and blockages without destroying the rock framework, and can prevent secondary damage caused by sensitive minerals. Precipitation is formed to improve the water absorption capacity of the oil layer

Method used

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  • Acidizing block remover suitable for complex lithologic reservoir
  • Acidizing block remover suitable for complex lithologic reservoir
  • Acidizing block remover suitable for complex lithologic reservoir

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Weigh 10g of hydrochloric acid, 1g of ammonium bifluoride, 2g of boric acid, 3g of glacial acetic acid, 4.0g of corrosion inhibitor, 2.0g of mutual solvent ethylene glycol monobutyl ether, 0.5g of penetrant alkylphenol polyoxyethylene ether, and 2.0g of clay stabilizer It is mixed with 75.5g of water to prepare an acidifying plug-removing agent.

[0016] The acidifying plugging remover is suitable for the formulation of an acidizing plugging removing agent for a low-harm waterproof and sensitive compound acid liquid system. The characteristic of this acid solution system is that it can effectively dissolve formation minerals and blockages without destroying the formation framework, prevent secondary precipitation caused by sensitive minerals, prevent clay mineral expansion and particle migration, and at the same time prevent formation emulsification and enhance formation Excellent water wettability ensures acidifying effect.

Embodiment 2

[0018] Weigh 8g of sulfamic acid, 2g of ammonium bifluoride, 0.5g of citric acid, 4.0g of corrosion inhibitor, 2.0g of mutual solvent, 0.5g of penetrating agent, 2.0g of clay stabilizer and 81.0g of water to prepare an acidifying plugging remover.

[0019] The acidifying plugging remover is suitable for acid-sensitive formations prone to hydrochloric acid.

Embodiment 3

[0021] Weigh 10g of hydrochloric acid, 3g of fluoboric acid, 2g of ethanol, 1g of triethanolamine, 4.0g of corrosion inhibitor, 2.0g of mutual solvent, 0.5g of penetrant, 3.0g of clay stabilizer and 74.5g of water and mix to prepare an acidifying plugging remover.

[0022] The acidizing plug-removing agent is suitable for low-damage, anti-swelling and anti-migration compound acid system in the tuffaceous reservoirs of Xing'anling Group. The acid system is characterized by the high content of montmorillonite and tuffaceous matter in the Xing'anling oil layer, and has dual water-sensitive characteristics of water swelling and clay migration. It can effectively dissolve formation minerals and blockages, and prevent clay minerals from swelling and granules. Migration meets the acidification needs of this type of reservoir.

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Abstract

The invention relates to an acidizing block remover suitable for a complex lithologic reservoir. The acidizing block remover suitable for the complex lithologic reservoir comprises the following components by weight: 0-12% of hydrochloric acid, 0-3% of ammonium bifluoride, 0-10% of sulfamic acid, 0-5% of fluoboric acid, 0-3% of boric acid, 0-4% of alcohol, 0-2% of triethanolamine, 3% of glacial acetic acid, 4.0-6.0% of corrosion inhibitor, 2.0-4.0% of mutual solvent, 0.5-1.0% of penetrating agent, 2.0% of clay stabilizer and 45-88.5% of water. The problems that the lithologic and physical property differences of oil fields are large, the oil fields are in staggered distribution, and the acidizing debugging construction effect of a common water injection well is not ideal are mainly solved. The acidizing block remover suitable for the complex lithologic reservoir can effectively corrode the strata minerals and obstruent, does not destroy a rock skeleton, can prevent secondary precipitation caused by sensitive mineral, improves the water absorbing capacity of the reservoir, and increases the daily increasing water injection rate of an average single-well measure.

Description

Technical field: [0001] The invention relates to a plugging-removing agent in the field of oil recovery, in particular to a plugging-removing agent suitable for acidification of complex lithology reservoirs. Background technique: [0002] "Enough water injection, good water injection" directly determines the effect of oilfield development. For water injection wells that are difficult to inject water, oilfields generally adopt acidizing plugging removal measures, that is, injecting acidizing plugging removing agents into the water injection wells to dissolve blockages and dredge reservoir pores, thereby improving the water absorption capacity of the reservoir. However, for complex lithology blocks in oilfields with poor reservoir physical properties, high shale content, large differences in lithology and clay mineral content, and unobvious distribution of clay minerals, for example, for block reservoirs divided into upper and lower sections, The porosity and permeability of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/74C09K8/528C09K8/524
Inventor 徐超孟令喜
Owner DAQING JINGSHENG WEIYE OILFIELD TECH SERVICE
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