Method for rapidly cleaning insoluble dirt in oil wells and oil reservoirs close to oil wells

An insoluble scale, oil well technology, applied in wellbore/well components, chemical instruments and methods, cleaning appliances, etc., can solve problems such as chemical incompatibility, oil well bore, ground blockage, production hazards, etc.
CN103206192AInactive Publication Date: 2013-07-17SOUTHWEST PETROLEUM UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SOUTHWEST PETROLEUM UNIV
Publication Date
2013-07-17
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method for rapidly cleaning stubborn dirt in oil wells and oil reservoirs close to oil wells. The method includes injecting penetrating fluid, spacer fluid and cleaning fluid to the stratum sequentially, closing the well to react for 3-5 hours, and cleaning blockages of oil reservoirs. The penetrating fluid is composed of glycol ethers and various surface active agents and is capable of penetrating, loosing and stripping organic blockages rapidly; the spacer fluid is composed of acidic medium containing complexing agent and is capable of dissolving inorganic dirt of iron dirt, calcium dirt, mineral dirt and the like; and the cleaning fluid is composed of sulfate, hydrosulfite and oxalate, is capable of acting with the acidic spacer fluid to oxidize and decompose of organic blockages completely, and recovering and increasing oil reservoir penetrating rate. Production increase effect is good after the blockages are cleaned.
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Description

technical field

[0001] The invention relates to a method for quickly removing refractory scale blockages in oil wells and near-well oil layers, and belongs to the technical field of oil and gas layer stimulation operations. Background technique

[0002] Due to the change of series factors such as pressure and temperature in the process of oil recovery, as well as the thermodynamic instability and chemical incompatibility of formation water and injection water in secondary oil recovery, it often causes oil well wellbore and ground blockage, which brings great impact on production. harm. The current research results show that there are two main types of oil reservoir plugging: inorganic scaling and organic fouling. Inorganic scaling mainly includes mineral scale, iron scale and CaCO3 scale. Mineral scale is mainly composed of Si and Al compounds formed by the migration of oil layer minerals; iron scale may be caused by the corrosion of oil production equipment by oilfield wa...

Claims

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