Water injection well multi-slug profile control method

A multi-slug and water injection well technology, applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc., can solve the problem of easy detour of injected water and re-formation breakthrough, limited control area of ​​large pore control, and loose performance structure and other problems, to achieve high material utilization, solve pollution problems, and increase oil production.

CN106988715AInactive Publication Date: 2017-07-28SHAANXI HEZHUN ENERGY SCI & TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2017-07-28
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a water injection well multi-slug profile control method. A multi-slug injection method is adopted, wherein a first slug adopts an organic jelly glue aqueous solution system including volume expansion grains; and a last slug comprises two stages, the first stage adopts an organic jelly glue aqueous solution system including volume expansion grains, and a profile control agent adopted by the second stage is a microsphere deep profile control modifying and flooding agent. In the water injection well multi-slug profile control method, a jelly glue type profile control agent selected and used by the first slug can form a powerful 'baffle' at the well bottom water injection front end, and the phenomena that a medicament is subsequently injected, and oily sludge directly dashes into an extraction oil well are avoided. In the last slug, the sizes of micro hole passageways are reduced through expansion performance of polymeric microspheres, depressurization and augmented injection are conducted through adsorbability of the polymeric microspheres, and well group oil production is increased through displacement performance of the polymeric microspheres. In the injection method adopting the three slugs, while consuming the oily sludge in a massive dose mode, the second slug enters large hole passageways and cracks to block a high-permeability layer band.
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Description

technical field

[0001] The invention relates to the technical field of profile control of water injection wells in oil fields, in particular to a multi-slug profile control method for water injection wells. Background technique

[0002] Oily sludge profile control is a chemical treatment method that effectively utilizes the mud components and oil components in the oily sludge to block the pores formed by water injection in the water injection layer. According to the physical properties of the oily sludge itself, adding an appropriate amount of suspending agent can not only suspend the solid particles in it, prolong the suspension time, increase the injection depth, but also effectively improve the plugging strength. Adding an appropriate amount of additives can disperse the oil components evenly and form a uniform and stable emulsion. When the emulsion reaches a certain depth in the formation, the emulsified suspension system is decomposed by the formation water and the ads...

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Embodiment Construction

[0033] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0034] In the present invention, the total injection volume of profile control liquid in low permeability oil field is 1800m 3 As an example, the multi-slug profile control method for water injection wells of the present invention is described, wherein a three-slug injection method is adopted.

[0035] 1st slug solution 400m 3 , in which polyacrylamide (0.2%, 0.8t), organic chromium cross-linking agent (0.2%, 0.8t), bulky particles (1.5%, 6t) and the rest are water (produced water reinjection), con...