Injection pretreatment method for oil water well

A pretreatment, oil-water well technology, applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc., can solve problems such as rapid rise in injection pressure, oil layer damage, low recovery degree, etc., to delay energy decline , The effect of removing formation blockage
CN100395429CInactive Publication Date: 2008-06-18王洪新
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
王洪新
Publication Date
2008-06-18
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention relates to an oil-water well shifting-in-injection pretreatment method, belonging to the field of oil field production technology. Said method includes the following steps: using pump truck to successively squeeze the prepad fluid formed from expansion-resisting expansion-reducing agent, visbreaking thickness-reducing agent and water-soluble demulsifying agent, aqueous solution-working solution composed of hydrochloric acid, fluohydric acid, corrosion inhibitor-mud acid, iron ion stabilizing agent-NTA, cleanup additive, expansion-resisting expansion-reducing agent, ethylene glycol butyl ether, and visbreaking thickness-reducing agent and clear water overflush fluid into the stratum, closing well and making reaction for 4-6 hr, making flowback, using pH test paper to determine pH, when the pH is equal to 7, stopping flowback, opening well to make normal production.
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Description

Technical field:

[0001] The invention belongs to the technical field of oil recovery in oil fields, and in particular relates to an oil-water well transfer pretreatment method for improving oil recovery. Background technique:

[0002] In the process of oilfield development, due to the gradual weakening of the formation energy, a large amount of crude oil remains in the formation and cannot be exploited, thereby reducing the recovery rate of crude oil. Therefore, in order to recover formation energy and make residual oil be extracted as much as possible, at present, the most commonly used method is to use water flooding for development. At present, water injection development basically adopts the following two forms: 1) New well investment: that is, water injection wells are drilled in new drilling blocks, and water injection development is carried out in the early water injection mode or in synchronization with production. 2) Oil well transfer: that is, due to the rapid dec...

Claims

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