Water injection well injection method using nanometer materials

Abstract

The invention provides a water injection well injection method using nanometer materials. The water injection well injection method comprises the following steps that (1), well washing operation is carried out on a well to be injected using well washing liquid; (2), trial squeezing is carried out using anti-swelling liquid, a wellhead is opened, a surface pipeline is connected, and after pressure-testing of the surface pipeline is qualified, direct circulation is carried out using the anti-swelling liquid until a string is unimpeded; (3), a casing gate is closed, and a nanometer polysilicon water solution slug is subjected to forward extrusion; (4), a displacement liquid slug is subject to forward extrusion after completing squeezing; (5), a well shut-in reaction is carried out; and (6), after pressure-testing of the wellhead is qualified, the well is opened to inject water. According to the water injection well injection method using the nanometer materials, after the injection, nanometer particles can be adsorbed on the surface of a formation micropore channel in the later development of water injection to form a nanometer adsorption layer, so that the hole wall surface has highhydrophobicity, on one hand, the flow resistance of water under high pressure can be reduced greatly, so that loose weak absorption water on the rock surface is easy to displace; and on the other hand, the water film can be thinned so as to enlarge the seepage pore diameter effectively and increase the effective volume of pore throats in the formation.

Description

technical field [0001] The invention relates to a water injection well injection method using nanometer materials, and belongs to the technical field of production injection well injection development in oil fields. Background technique [0002] From the completion of drilling to the normal water injection of the water injection well, it is generally necessary to go through liquid drainage, well flushing, and test injection before it can be transferred to normal water injection. The purpose of liquid drainage is to remove the blockage in the oil layer, create an appropriate low-pressure zone near the bottom of the well, create favorable conditions for water injection, and use part of the elastic reserves to reduce the energy loss of the water injection well or near the water injection well, which is conducive to the drainage of the water injection well. Pull into the waterline. [0003] Injection wells also need to be cleaned after drainage. The purpose of well flushing is...

AI Technical Summary

Problems solved by technology

However, according to statistical results, the pressure of water injection wells generally rises rapidly after flushing and squeezing injection with active water. The reason for this analysis is the blockage of the near-wellbore area and the swelling of clay caused by water sensitivity during the later water injection process.