Shallow layer low-temperature oil deposit microfoam temporary plugging agent and preparation method thereof

Abstract

The invention discloses a shallow layer low-temperature oil deposit microfoam temporary plugging agent and a preparation method thereof and is applied to the technical field of improving oilfield recovery efficiency. The shallow layer low-temperature oil deposit microfoam temporary plugging agent consists of the following components in different parts by weight according to a same weight standard:200 parts of NaHCO3 aqueous stratum water, 0.4-0.6 part of sodium hexadecyl benzene sulfonate, 1.5-2.0 parts of sodium carboxymethylcellulose and 1.0-2.0 parts of a soluble starch. The shallow layerlow-temperature oil deposit microfoam temporary plugging agent is used in a low-temperature oil deposit within a temperature range of 30-40 DEG C. The shallow layer low-temperature oil deposit microfoam temporary plugging agent is good in foaming property, large in foam amount and good in stability, can be kept at a relatively stable state for a long time, has good pressure resistance strength, has good injection performance, can be fed into a low-pressure layer priorly, is good in plugging performance for the low-pressure layer and poor in plugging performance for a high-pressure layer, doesnot contaminate the low-pressure layer after effect loss, and has a good real-time plugging capability.

Description

technical field [0001] The invention relates to the technical field of improving oil recovery, in particular to a microfoam temporary plugging agent for shallow low-temperature oil reservoirs and a preparation method thereof. Background technique [0002] Fracturing is an important technical measure for increasing production of oil and gas wells and increasing injection of water injection wells. It is not only widely used in low permeability oil and gas reservoirs, but also plays a very good role in stimulation of medium and high permeability oil and gas reservoirs. The principle is to inject a large amount of liquid (usually water) into the well by using a high-pressure pump set on the ground. When the pressure generated is greater than the in-situ stress and the tensile strength of the formation rock, cracks will be generated to stimulate oil and gas production. When new fractures need to be generated, temporary plugging agent needs to be injected into the original fractur...

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Problems solved by technology

[0004] In order to solve the problems mentioned in the background technology (1) serious formation pollution and poor environmental performance; (2) complicated process and high cost; (3) poor adaptability to low temperature and low permeability reservoirs, the present invention provides a shallow Micro-foam temporary plugging agent for shallow low-temperature reservoirs and a preparation method thereof. The micro-foam temporary plugging agent for shallow low-temperature reservoirs has good foaming performance, large foaming volume, and strong stability; It maintains a relatively stable state for a period of time and has strong compressive strength; it has good injection performance, can preferentially enter the low-pressure layer, and has strong sealing ability for low-pressure layers and weak sealing ability for high-pressure layers, and will not pollute after failure Low-pressure layer with strong real-time sealing ability

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