CN201090193Y

CN201090193Y - Discharging-aid arrangement for injecting nitrogen gas into thick oil well

Info

Publication number: CN201090193Y
Application number: CNU2007201729527U
Authority: CN
Inventors: 刘占广; 葛东文; 马春波; 刘冬菊; 黄淑娥; 高超勇
Original assignee: China Petroleum and Natural Gas Co Ltd
Current assignee: China Petroleum and Natural Gas Co Ltd
Priority date: 2007-09-04
Filing date: 2007-09-04
Publication date: 2008-07-23
Anticipated expiration: 2017-09-04

Abstract

Disclosed is a nitrogen injection and discharge aiding device used in a heavy oil well, which is composed of a casing 1, an oil pipe 2, a primary pump joint 3 and a horn mouth 4, the utility model adopts the structure that the oil pipe is arranged in the casing, the horn mouth is connected to the lower part of the oil pipe, and the primary pump joint is connected to the middle part thereof, so the nitrogen making and injection device can be utilized to prepare nitrogen directly from the air, and the nitrogen is filled into the oil well through the oil pipe and the casing in annular. The nitrogen has low density, viscosity and coefficient of thermal conductivity as an inert gas, and is not easy to have reaction with formation fluid and rock and mineral, and the nitrogen has high coefficient of compressibility and strong swelling power. After the nitrogen enters the stratum, the volume of the nitrogen will expand rapidly for supplementing the formation energy as the formation pressure drops, thereby playing a role in oil displacement and increasing the recovery factor of oil well. The utility model has advantages of simple structure and easy operation, and is quite suitable for the application in the field.

Description

A kind of heavy oil wells is annotated nitrogen and is helped arranging device

Technical field:

The utility model relates to the down-hole string that uses on a kind of oilfield, and particularly a kind of heavy oil wells is annotated nitrogen and helped arranging device.

Background technology:

Inject the increase of round along with the thick oil filling steam-stimulated well, quantity of steam increases, injection-production ratio descends by round, the water content of output liquid is on the increase, simultaneously underground energy is in debt serious, the input-output ratio that causes the high round in oil field to annotate the single steam injection oil recovery of vapour well is seriously lacked of proper care, and stratum energy constantly reduces, and some well has arrived the economic exploitation limit.Thereby influence is produced, and has reduced recovery ratio.

The utility model content:

The purpose of this utility model is to provide a kind of heavy oil wells to annotate nitrogen and helps arranging device, improves strata pressure, improves the produced liquid in oil well amount, reduces produced water cut, improves the thermally insulating the borehole effect, reduces heat waste, improves the thermal efficiency.Thereby the raising well oil output improves the steam incoming and outcoming well and annotates the vapour effect.

The utility model is achieved in that by sleeve pipe (1), oil pipe (2), a pump joint (3), horn mouth (4) to be formed, and oil pipe (2) is arranged in sleeve pipe (1), connects horn mouth (4) under the oil pipe (2), and indirect is pump joint (3) once.

The utility model has oil pipe owing to having adopted in sleeve pipe, connect horn mouth under the oil pipe, and indirect is the pump joint once, utilizes the nitrogen making and injection device, directly produces nitrogen from air, injects oil well by oil pipe and casing annulus.Nitrogen is as inert gas, and its density, viscosity, coefficient of thermal conductivity are all lower, is difficult for reacting with formation fluid and rock forming mineral, and compression coefficient is big, and swelliong power is strong.After nitrogen entered the stratum, along with strata pressure reduces, the nitrogen volume expanded rapidly, replenishes stratum energy, thereby plays displacement of reservoir oil effect, improves the oil well recovery ratio.Simple in structure, processing ease is well suited for The field.

Description of drawings:

Accompanying drawing 1 is a structural representation of the present utility model.

The specific embodiment:

The utility model is provided by following examples, is illustrated below in conjunction with accompanying drawing.

As shown in the figure, the utility model is made up of sleeve pipe 1, oil pipe 2, pump joint 3, a horn mouth 4, and oil pipe 2 is arranged in sleeve pipe 1, oil pipe connect for 2 times horn mouth 4,, indirect is pump joint 3 once.From air, directly produce nitrogen, inject oil well, when nitrogen gos deep into, the steam that injects is pushed to the oil reservoir deep in the stratum, the heat of steam is fully absorbed by crude oil by oil pipe and casing annulus.In addition, interfacial tension between nitrogen and crude oil is 8.9dyn/cm, and the interfacial tension of water and crude oil is 30.5dyn/cm, the reduction of interfacial tension, will improve the sweep area of steam in the stratum greatly, improve the development effectiveness of steam soak and steam flooding, improve oil displacement efficiency, thereby improve oil recovery factor.

Claims

1. a heavy oil wells is annotated nitrogen and is helped arranging device, sleeve pipe (1), oil pipe (2), a pump joint (3), horn mouth (4) are formed, it is characterized in that: oil pipe (2) is arranged in sleeve pipe (1), connect horn mouth (4) under the oil pipe (2), indirect is pump joint (3) once.