Active mixed acid plugging removal solution applicable to low permeability reservoir
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A low-permeability reservoir, mixed acid technology, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of short validity period, poor effect of plugging removal and injection enhancement, etc., achieve good effect, inhibit clay expansion, improve Effect of Water Phase Permeability
Active Publication Date: 2012-11-14
DAQING JINGSHENG WEIYE OILFIELD TECH SERVICE +1
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[0003] The present invention aims to overcome the problem in the background technology that conventional earth acid and compound acid methods are used for plugging removal in low-permeability formations, and the effective period is short, and the effect of plugging removal and injection enhancement is poor, and an active mixed acid suitable for low-permeability reservoirs is provided. Unblocking fluid
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Embodiment 1
[0011] Weigh 9g of acetic acid, 5g of formic acid, 2g of ammonium difluoride, 2g of boric acid, 1.0g of corrosion inhibitor, 2.0g of mutual solvent, 2.0g of clay stabilizer, 0.5g of anti-wetting active agent and 76.5g of water to prepare acid hydrolysis Blockage.
Embodiment 2
[0013] Weigh 10g of acetic acid, 7g of formic acid, 3g of ammonium difluoride, 4g of boric acid, 2.0g of corrosion inhibitor, 4.0g of mutual solvent, 2.0g of clay stabilizer, 1.0g of anti-wetting active agent and 67.0g of water to prepare acid hydrolysis Blockage.
Embodiment 3
[0015] Weigh 9.5g of acetic acid, 6g of formic acid, 2.5g of ammonium difluoride, 3g of boric acid, 1.5g of corrosion inhibitor, 3.0g of mutual solvent, 2.0g of clay stabilizer, 0.7g of dewetting active agent and 71.8g of water and mix to prepare Acid unblocking fluid.
[0016] Performance evaluation of the active mixed acid plugging fluid suitable for low-permeability reservoirs:
[0017] 1. Evaluation of corrosion ability and retarding performance
[0018] A certain weight (1g) of rock cuttings is ground into a powder of 100 meshes, and placed in a certain amount (10ml) of acid solution, and its dissolution rate is measured at 65°C and at different times. Table 1 lists the comparison between the active mixed acid of the present invention and conventional earth acid in corrosion inhibition performance and dissolution ability.
[0019] Table 1 Dissolution experiment data
[0020]
[0021] It can be seen from Table 1 that after 4 hours of reaction, the reaction between so...
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Abstract
The invention relates to active mixed acid plugging removal solution applicable to a low permeability reservoir and mainly solves the problems of short period of validity and poor plugging removal and augmented injection effects when conventional mud acid and composite acid methods are adopted for plugging removal treatment on low permeability formation. The active mixed acid plugging removal solution consists of the following components in proportions according to weight percent: 9-10% of acetic acid, 5-7% of formic acid, 2%-3% of bifluorid acid ammonium, 2%-4% of boric acid, 1.0-2.0% of corrosion inhibitor, 2.0-4.0% of mutual solvent, 2.0% of clay stabilizer, 0.5-1.0% of dewetting active agent and 67.0-76.5% of water. The active mixed acid plugging removal solution applicable to the low permeability reservoir can delay the reaction rate of acid rock, increase the effective operating distance of acid solution, and realize the acidification of deep formation, and simultaneously can improve the oil and water seepage characteristics and increase the water phase permeability.
Description
Technical field: [0001] The present invention relates to an acidizing plugging-removing agent in the field of oil recovery, in particular to an active mixed acid plugging-removing fluid suitable for low-permeability reservoirs. Background technique: [0002] The salient features of low-permeability reservoirs are poor reservoir development, low permeability, and small porosity. During the water injection process, due to the influence of factors such as mechanical impurities in the water, scale-forming ions exceeding the standard, and formation particle migration, it will inevitably cause damage to the formation, reduce the formation permeability, and affect the normal production of the oil field. Especially in recent years, oilfields have gradually adopted sewage reinjection or clean and sewage mixed injection, and the water quality has seriously declined. For low-permeability reservoirs, the problem of formation damage has become increasingly prominent, the water injection ...
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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/52C09K8/58
Inventor 徐超孟令喜
Owner DAQING JINGSHENG WEIYE OILFIELD TECH SERVICE
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