Development and Performance Evaluation of Weak Acid Plugging Removal Agent for Chlorite

PAN Dingcheng; WEI Huiying; ZHANG Hongjing; WANG Gui; DING Wengang; YI Xiaoyi

doi:10.12358/j.issn.1001-5620.2022.04.019

Volume 39 Issue 4

Jul. 2022

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Article Navigation > DRILLING FLUID & COMPLETION FLUID > 2022 > 39(4): 522-528

PAN Dingcheng, WEI Huiying, ZHANG Hongjing, et al.Development and performance evaluation of weak acid plugging removal agent for chlorite[J]. Drilling Fluid & Completion Fluid，2022, 39（4）：522-528 doi: 10.12358/j.issn.1001-5620.2022.04.019

Citation:

PAN Dingcheng, WEI Huiying, ZHANG Hongjing, et al.Development and performance evaluation of weak acid plugging removal agent for chlorite[J]. Drilling Fluid & Completion Fluid，2022, 39（4）：522-528 doi: 10.12358/j.issn.1001-5620.2022.04.019

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Development and Performance Evaluation of Weak Acid Plugging Removal Agent for Chlorite

doi: 10.12358/j.issn.1001-5620.2022.04.019

1.
Production Optimization, China Oilfield Services Limited, Tianjin 300459
2.
College of Chemistry and Chemical Engineering, Central South University, Changsha,Hunan 410083

Received Date: 2022-03-01
Accepted Date: 2022-01-31
Rev Recd Date: 2022-05-05
Publish Date: 2022-07-30

Abstract

Abstract

Clay minerals often pollute and block oil reservoirs. Chlorite is one of the main components of clay minerals. The strong acid as plugging remover in feature of high corrosivity and high efficiency was commonly used in the oilfields. When the protons are consumed, the efficiency of the plugging remover system is greatly reduced. To solve the problem of oilfield blockage material, this paper compares the physical properties of chlorite from various producing areas, and purposefully develops a weak acid plugging remover with a strong chelating ability to metal in clay minerals and buffering ability. The experimental research displays that under the conditions of 4% mass concentration of main plugging removal agent and pH = 5, the dissolution rate of chlorite reaches 25% under 24 h, indicating that the plugging remover has the advantages of high dissolution rate, good plugging removal effect, weak corrosion, and good compatibility. The mechanism study shows that the effective combination of plugging remover and buffer system to continuously and stably provide a certain concentration of protons is the key to the efficient plugging removal of chlorite under weak acidic conditions. During the exploitation of well WZ-X, clay swelling and migration damage were caused by drilling and completion fluid immersion into the formation. Chlorite plugging agent was used to remove pollution. After the operation, the fluid production of the well increased from 55.5 m³/d to 98 m³/d. The successful application of this technology provides a new direction for oilfield plugging removal.
- Plugging remover,
- Weak acidic condition,
- Buffer system,
- Chlorite,
- Dissolution rate

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References

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沈阳化工大学材料科学与工程学院沈阳 110142

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Development and Performance Evaluation of Weak Acid Plugging Removal Agent for Chlorite

doi: 10.12358/j.issn.1001-5620.2022.04.019

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Development and Performance Evaluation of Weak Acid Plugging Removal Agent for Chlorite

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