CN110746952A

CN110746952A - Biological solvent for oil well blockage removal

Info

Publication number: CN110746952A
Application number: CN201911048507.3A
Authority: CN
Inventors: 陈健
Original assignee: Tianjin Baian Technology Co Ltd
Current assignee: Tianjin Baian Technology Co Ltd
Priority date: 2019-10-31
Filing date: 2019-10-31
Publication date: 2020-02-04

Abstract

The invention provides a biological solvent for oil well blockage removal, which comprises the following components in percentage by mass: 4-20% of sodium phosphate solution, 7-15% of fatty alcohol-polyoxyethylene ether, 10-15% of hydrochloric acid, 15-25% of nonylphenol polyoxyethylene ether, 2-8% of ethylene glycol butyl ether, 4-20% of polydimethyldiallyl ammonium chloride and a proper amount of deionized water, wherein the nonylphenol polyoxyethylene ether and the deionized water are mixed and stirred for 1h to obtain a mixture of the nonylphenol polyoxyethylene ether and the deionized water, the sodium phosphate solution, the fatty alcohol-polyoxyethylene ether, the hydrochloric acid, the mixture of the nonylphenol polyoxyethylene ether and the deionized water and the ethylene glycol butyl ether are sequentially added into a stirring reactor according to the mass ratio, stirred for 1-2h and kept stand for 2-5 h. The invention has good safety and simple preparation process, can effectively dissolve and erode the polymer and oil dirt on the bottom of the oil well and the wall surface of the pore passage, removes the adsorption of the polymer in the oil layer, and has no harm to human bodies, no flammability and no pollution to the environment.

Description

Biological solvent for oil well blockage removal

Technical Field

The invention belongs to the field of biological agent solvents for removing blockage of oil wells, and particularly relates to a biological solvent for removing blockage of an oil well.

Background

With the increase of world energy demand, the reasonable development and utilization of petroleum have attracted great attention of people, and the requirements on the production quantity and the production efficiency of petroleum are higher and higher. The method realizes the efficient exploitation of oil and gas resources, and has practical significance and important strategic significance for improving the yield of crude oil.

Oil and gas system solid phase deposition has always been a serious problem facing the petroleum industry. The deposition of organic solids may occur in various production stages of oil and gas production. The problems caused by organic matter deposition can be summarized in the following aspects: (1) the pressure drop is greatest when crude oil enters the wellbore or perforation from the formation, and thus asphaltene deposition is more severe in the near-wellbore and perforations. (2) Deposition in the formation tunnels causes poor rock permeability, resulting in reduced productivity. (3) Deposits in wellbores and downhole equipment, surface pipelines, vessels, equipment, cause increased flow resistance and even plugging, and reduce the efficiency of production.

In the process of oil exploitation, after oil reservoir fluid is extracted, when the oil reservoir fluid reaches a certain depth along a shaft or reaches the ground, due to the reduction of temperature and pressure and the change of system composition, organic solid-phase substances such as wax, colloid, asphaltene and the like are deposited. The solid deposition phenomenon can be frequently observed in the well bottom and the shaft, the deposited solid-phase substance blocks the production well, the pressure gradient of fluid flow is increased, and the oil well yield is greatly reduced, and even stops production in severe cases. Therefore, effective blockage removal and prevention measures for the deposition of the asphaltene in the crude oil are very important. The current common method for removing the blockage of the oil well is to inject a solvent or a dispersant into the oil well, but the solvents have the problems of large solvent consumption, short treatment effect maintaining time, environmental pollution and the like when being used on site. Therefore, a novel oil well blocking remover is developed, the content of volatile organic solvent is reduced as much as possible, and the purposes of safety, low toxicity, environmental protection and good blocking removing effect are achieved. Ideally, the solution after plugging removal can directly enter a ground manifold system along with well flow after well opening without being discharged.

Disclosure of Invention

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention is further described below:

example (b):

a biological solvent for oil well blockage removal is composed of the following components in percentage by mass: 4-20% of sodium phosphate solution, 7-15% of fatty alcohol-polyoxyethylene ether, 10-15% of hydrochloric acid, 15-25% of nonylphenol polyoxyethylene ether, 2-8% of ethylene glycol butyl ether, 4-20% of polydimethyldiallyl ammonium chloride and a proper amount of deionized water, wherein the nonylphenol polyoxyethylene ether and the deionized water are mixed and stirred for 1h to obtain a mixture of the nonylphenol polyoxyethylene ether and the deionized water, the sodium phosphate solution, the fatty alcohol-polyoxyethylene ether, the hydrochloric acid, the mixture of the nonylphenol polyoxyethylene ether and the deionized water and the ethylene glycol butyl ether are sequentially added into a stirring reactor according to the mass ratio, stirred for 1-2h and kept stand for 2-5 h.

Specifically, the coating comprises the following components in percentage by mass: 12% of sodium phosphate solution, 10% of fatty alcohol-polyoxyethylene ether, 10% of hydrochloric acid, 20% of nonylphenol polyoxyethylene ether, 6% of butyl cellosolve and 15% of polydimethyldiallyl ammonium chloride.

Example 1

Firstly, mixing and stirring 20% of nonylphenol polyoxyethylene ether and a proper amount of deionized water for 1h to obtain a mixture of nonylphenol polyoxyethylene ether and deionized water, then sequentially adding 12% of sodium phosphate solution, 10% of fatty alcohol polyoxyethylene ether, 10% of hydrochloric acid, the mixture of nonylphenol polyoxyethylene ether and deionized water and 6% of ethylene glycol butyl ether into a stirring reactor, stirring for 1-2h, and standing for 2-5h to obtain the biological agent solvent for unblocking an oil well.

It should be noted that, in this document, moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The biological solvent for oil well blockage removal is characterized by comprising the following components in percentage by mass: 4-20% of sodium phosphate solution, 7-15% of fatty alcohol-polyoxyethylene ether, 10-15% of hydrochloric acid, 15-25% of nonylphenol polyoxyethylene ether, 2-8% of ethylene glycol butyl ether, 4-20% of polydimethyldiallyl ammonium chloride and a proper amount of deionized water, wherein the nonylphenol polyoxyethylene ether and the deionized water are mixed and stirred for 1h to obtain a mixture of the nonylphenol polyoxyethylene ether and the deionized water, the sodium phosphate solution, the fatty alcohol-polyoxyethylene ether, the hydrochloric acid, the mixture of the nonylphenol polyoxyethylene ether and the deionized water and the ethylene glycol butyl ether are sequentially added into a stirring reactor according to the mass ratio, stirred for 1-2h and kept stand for 2-5 h.

2. The biological solvent for oil well blockage removal according to claim 1, which is characterized by comprising the following components in percentage by mass: 12% of sodium phosphate solution, 10% of fatty alcohol-polyoxyethylene ether, 10% of hydrochloric acid, 20% of nonylphenol polyoxyethylene ether, 6% of butyl cellosolve and 15% of polydimethyldiallyl ammonium chloride.