Tight oil reservoir high-viscosity strong-corrosion acid liquid system

A technology for tight oil reservoirs and high viscosity, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of reduced production, increased production and increased injection, unsatisfactory effects of increased injection, and inability to completely remove blockages, etc., to achieve increased The effect of the effective range

Active Publication Date: 2019-11-29
西安石油大油气科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] From the current effect of acidification plugging removal measures, the effect of increasing production and increasing injection is not ideal. It is not that the acid solution has a poor effect on plugging and plugging. The main reason is that the acid solution is not completely as expected due to the "fingering" phenomenon. It is envisaged to enter the clogging zone for unblocking, but to enter the high-permeability layer with low seepage resistance to improve its matrix, the clogging cannot be completely removed, and the clogging in the reservoir will aggravate scaling and reduce production, thus shortening the effective period of acidification measures

Method used

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  • Tight oil reservoir high-viscosity strong-corrosion acid liquid system

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Effect test

Embodiment 1

[0031] A high-viscosity and strong-corrosion acid liquid system for tight oil reservoirs, comprising:

[0032] 6% hydrochloric acid, 1% betaine, 4% enhancer, 0.05% citric acid, 0.5% ammonium chloride, 0.5% corrosion inhibitor, 0.1% drainage aid, 0.05% demulsifier, the balance is water, the above groups The sum of the points is 100%;

[0033] Described strengthening agent is JD-30B strengthening agent (Sichuan Kaier Oil and Gas Field Technical Service Co., Ltd. has sale);

[0034] Described corrosion inhibitor is sodium nitrate;

[0035] The drainage aid is polyoxyethylene fatty acid ester;

[0036] The demulsifier is demulsifier MQ801 (available from Guangzhou Miaoqing Environmental Protection Technology Co., Ltd.).

[0037] The acid solution formula has good stability at room temperature and reservoir temperature, strong dissolution ability; good slowing effect, when the residual acid concentration of the high-viscosity and strong corrosion acid solution system drops to ha...

Embodiment 2

[0039] A high-viscosity and strong-corrosion acid liquid system for tight oil reservoirs, comprising:

[0040] 12% hydrochloric acid, 3% betaine, 8% enhancer, 0.2% citric acid, 2% ammonium chloride, 2% corrosion inhibitor, 0.4% drainage aid, 0.2% demulsifier, the balance is water, the above groups The sum of the points is 100%;

[0041] Described strengthening agent is JD-30B strengthening agent (Sichuan Kaier Oil and Gas Field Technical Service Co., Ltd. has sale);

[0042] The corrosion inhibitor is potassium fluoride;

[0043] The drainage aid is polyoxyethylene alkylamine;

[0044] The demulsifier is demulsifier MQ801 (available from Guangzhou Miaoqing Environmental Protection Technology Co., Ltd.).

[0045] The acid solution formula has good stability at room temperature and reservoir temperature, strong dissolution ability; good slowing effect, when the residual acid concentration of the high-viscosity and strong corrosion acid solution system drops to half, the time ...

Embodiment 3

[0047] A high-viscosity and strong-corrosion acid liquid system for tight oil reservoirs, comprising:

[0048] 8%% hydrochloric acid, 1% betaine, 5% JD-30B enhancer, 0.05% citric acid, 0.5% ammonium chloride, 0.5% sodium nitrate, 0.2% polyoxyethylene alkylamide, 0.05% demulsifier MQ801, the rest The amount is water, and the sum of the above components is 100%.

[0049] The acid solution formula has good stability at room temperature and reservoir temperature, strong dissolution ability; good slowing effect, when the residual acid concentration of the high-viscosity and strong corrosion acid solution system drops to half, the time for the residual acid concentration of soil acid to drop to half 8 to 13 times longer than the normal time; the viscosity is moderate and has the characteristics of diversion and diversion, which can reduce the "fingering" phenomenon of acid liquid. After the viscosity rises and reaches the barrier function in the fracture, the high-viscosity and stro...

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Abstract

The invention discloses a tight oil reservoir high-viscosity strong-corrosion acid liquid system, which comprises the following components by mass percentage: 6%-12% of hydrochloric acid, 1%-3% of betaine, 4%-8% of a reinforcing agent, 0.05%-0.2% of citric acid, 0.5%-2% of ammonium chloride, 0.5%-2% of a corrosion inhibitor, 0.1%-0.4% of a cleanup additive, 0.05%-0.2% of a demulsifier and the balance water. During acidification of the acid liquid system, the rise of the acid liquid viscosity reduces the acid liquid filtrate loss, thus forcing more fresh acid to enter deep stratum, and increasing the effective action distance of the acid liquid, and at the end of acidification, high-viscosity fluid undergoes automatic gel breaking into a low-viscosity fluid when encountering crude oil in the stratum, so that the stratum is exempt from secondary damage.

Description

technical field [0001] The invention relates to an acidizing and plugging-removing acid solution in oil and gas field development technology, in particular to a high-viscosity and strong-corrosion acid solution system for tight oil reservoirs. Background technique [0002] With the increase of oil field development, the increase of water flooding energy, and the fracturing process and the water flooding process may cause some damage to the reservoir, which will bring some new problems in the long-term production of oil wells, such as The water flooding process often causes the migration of fine sand bodies in the formation to block the oil outlet channels, and formation scaling pollutes the oil outlet channels, resulting in blockage and pollution of the oil outlet channels. For these reasons, the skin factor of oil wells increases, resulting in a reduction in the production of some oil wells. [0003] For this reason, it is necessary to acidify oil-bearing reservoirs (fract...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/74C09K8/528
CPCC09K8/528C09K8/74C09K2208/32
Inventor 黄兴雷博薛俊杰余华贵陈姣妮
Owner 西安石油大油气科技有限公司
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