Particulate profile control agent self-adaptive to size of formation pore throat and preparation method thereof

Patent metadata

Field	Value
Publication number	US-11015109-B2
Application number	US-202017070943-A
Country	US
Kind code	B2
Filing date	Oct 15, 2020
Priority date	Oct 16, 2019
Publication date	May 25, 2021
Grant date	May 25, 2021

Abstract

A particulate profile control agent self-adaptive to a size of formation pore throat and a preparation method thereof include: raw materials and mass fraction for preparing a system including a main agent of 0.04˜0.2%, a nucleating agent of 0.005˜0.01%, a crosslinking agent of 0.002˜0.04%, an additive of 0.005˜0.01% and water. The preparation method includes: adding the main agent in proportion to the water and evenly mixing the mixture of the main agent and the water, and then adding the additive, the crosslinking agent and the nucleating agent in turn so as to form the profile control agent; pumping the profile control agent into the formation to be reacted at a reservoir temperature for a period of time to form colloidal particles on the spot for sealing off a high-permeability layer. The present disclosure is of easy operation and low cost, low initial viscosity and good injectivity.

First claim

What is claimed is:

1. A particulate profile control agent self-adaptive to a size of formation pore throat comprising: calculated according to a mass percentage, a main agent of 0.04˜0.2%, a nucleating agent of 0.005˜0.01%, a crosslinking agent of 0.002˜0.04%, an additive of 0.005˜0.01%, and rest of water, and wherein the main agent is a water-soluble polymer with a number average molecular weight of 2˜15 million, and wherein the water-soluble polymer is polyacrylamide;
the nucleating agent selected from at least one of sodium benzoate, aluminum benzoate, nano-silica, nano-calcium carbonate or talc powder;
the crosslinking agent selected from at least one of phenolic resin, chromium acetate, aluminum citrate, methylene diacrylamide, hexamethylenetetramine or divinylbenzene; and
the additive selected from at least one of thiourea, sodium thiosulfate, sodium sulfite or hydrazine.

2. A preparation method of the particulate profile control agent self-adaptive to the size of formation pore throat as claimed in claim 1 , wherein the method comprises steps following as:
step 1, slowly adding the main agent to the water and continuously stirring for 45˜180 minutes at a stirring speed of 150˜300 rpm so as to obtain a uniform solution;
step 2, slowly adding the additive, the crosslinking agent and the nucleating agent to the uniform solution obtained in the step 1 while slowly stirring the uniform solution, and then continuously stirring a mixture thereof until the mixture is evenly mixed to obtain the particulate profile control agent.

Assignees

• Univ Southwest Petroleum

Inventors

• Jin Fayang
• Du Daijun
• Pu Wanfen
• Li Xiang
• Ju ye
• Li Kexing
• Sun Lin
• Liu Rui
• Song Shuyu
• Wang Mian
• Liao Wei
• Qian Desheng

Classifications

• C09K8/588

  characterised by the use of specific polymers {(polymeric surfactants C09K8/584)} · CPC title

• C09K8/5083 Primary

  obtained by reactions only involving carbon-to-carbon unsaturated bonds · CPC title

• C09K8/5045

  containing inorganic compounds · CPC title

• C09K8/516

  characterised by their form or by the form of their components, e.g. encapsulated material · CPC title

• C09K8/512

  containing cross-linking agents · CPC title