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Stratified injection tubular column and stratified injection system

A technology of injection pipe and outer pipe string, which is applied in the fields of production fluid, wellbore/well components, earth-moving drilling, etc., can solve the problems of unsatisfactory ignition effect and inability to run the igniter, and achieve the effect of improving efficiency

Inactive Publication Date: 2019-01-04
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, the existing layered fire flooding strings that have entered the field test only have oil-jacketed isolation layered gas injection strings to achieve concentric double-layer injection. Using steam injection to preheat natural ignition or chemical ignition, the ignition effect is not ideal

Method used

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  • Stratified injection tubular column and stratified injection system
  • Stratified injection tubular column and stratified injection system
  • Stratified injection tubular column and stratified injection system

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Embodiment Construction

[0049] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described The embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0050] It should be noted that when an element is referred to as being “disposed on” another element, it may be directly on the other element or there may be another element in between. When an element is said to be "connected" to another element, it can be directly connected to the other element or it may be present intervening with th...

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Abstract

The invention discloses a stratified injection tubular column and a stratified injection system. The stratified injection tubular column comprises an outer tubular column and an inner tubular column arranged in the outer tubular column in a sleeving mode. The inner tubular column comprises a first gas injection device, a sealing device and a second gas injection device, wherein the first gas injectiondevice, the sealing device and the second gas injection device are sequentially connected. The outer tubular column is provided with cable-passing packers capable of separating oil sleeve annuluses between the outer pipe tubular column and a casing pipe. The sealing device separates annuluses between the outer tubular column and the inner tubular column. The stratified injection tubular columnand the stratified injection system are used for a heavy oil well. Fire flooding stratified ignition can be realized, an ignition system can be effectively used, and therefore the efficiency of heavyoil exploitation can be improved.

Description

technical field [0001] The present application relates to the field of heavy oil development, in particular to a layered injection string and a layered injection system. Background technique [0002] The heavy oil in Liaohe Oilfield has high colloid and bitumen content and poor fluidity, so it is difficult to exploit, and it is already in the late stage of steam stimulation. At present, it is urgent to change the development method to achieve the effect of stable production. Taking fire flooding as its replacement development method is an effective means. The key to the success of fire flooding development is oil layer ignition. The patent of the present invention provides a testable oil jacket isolation layered injection string. [0003] At present, electric ignition is one of the main methods of oil layer ignition commonly used at home and abroad. The fire drive electric ignition technology mainly uses the electric heater at the bottom of the well to heat the medium (air ...

Claims

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Application Information

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IPC IPC(8): E21B43/14E21B43/243E21B34/14
CPCE21B34/14E21B43/14E21B43/243E21B2200/06
Inventor 施玉何传兴陈鹏赵树杰徐雪楠胡燕许佳赛王俊英赵小强彭志会董亮田野任鹏承张成宇
Owner PETROCHINA CO LTD
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