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Multi-media separated injection system suitable for mine field complex oil reservoir

A multi-medium and medium technology, applied in the direction of production fluid, wellbore/well components, earthwork drilling and production, etc., can solve the problems of difficult measurement and adjustment, small injection range, equipment corrosion, etc., to achieve enhanced recovery, applicable Wide range, avoid corrosive effects

Active Publication Date: 2015-09-30
NORTHEAST GASOLINEEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the inventors found in the process of realizing the present invention that, due to the above-mentioned split injection scheme, the range of injection is small, the types of injection are limited, the measurement and adjustment are difficult, the change of polymer viscosity cannot be measured in real time, and the pipe string equipment is washed by the injection medium. Due to the existence of problems such as equipment corrosion, the downhole separate injection device disclosed in the prior art cannot meet the collection needs of complex oil layers in the mine, which is not conducive to the improvement of recovery efficiency

Method used

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  • Multi-media separated injection system suitable for mine field complex oil reservoir
  • Multi-media separated injection system suitable for mine field complex oil reservoir
  • Multi-media separated injection system suitable for mine field complex oil reservoir

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] When there are two or more injection media in different intervals, according to the injection requirements, select the appropriate flow channel according to the layer depth adapted to each flow channel, open the wellhead control valve corresponding to each flow channel, and inject into the pipeline at the same time medium.

[0084] Geological features of a certain block:

[0085] The buried depth of oil in this block is large, and oil layers were found at depths of 1800m, 2200m, 3000m and 3500m. The oil layers are heterogeneous formations, and the physical properties of the oil layers in each layer are quite different: the shallow layer has high permeability and porosity, the formation fluid velocity is high, and the pressure of the overlying rock is much lower than that of the middle and deep layers; the middle layer permeability and porosity Smaller, the formation rock density is higher; the deep section is an overpressure formation, the formation fluid is more, the ...

Embodiment 2

[0106] When there is only one type of injection medium and the interval is relatively single, select the appropriate flow channel according to the depth of the interval adapted to each flow channel, open the corresponding wellhead control valve, and start injecting the medium.

[0107] In this embodiment, the geological characteristics of the oilfield block strata are still selected from the first embodiment. When the well depth reaches 2200m, the oil layer is found. The depth is much smaller. In view of the geological characteristics of this layer, the fourth flow channel is selected in the device of the present invention, and a medium-concentrated high-concentration polymer is injected into the formation to increase the recovery factor.

[0108] Media injection and subsequent monitoring and debugging are as follows:

[0109] (1) Medium injection

[0110] According to the site conditions, analyze the geological data of the formation, select the initial injection pressure an...

Embodiment 3

[0117] When there is only one type of injection medium and multiple layers need to be injected at the same time, multiple suitable flow channels are selected according to the depth of each flow channel, and the wellhead control valves of the respective flow channels are opened to inject the medium at the same time.

[0118] In this embodiment, the geological features of the oilfield block strata are still selected from the first embodiment. Select the overpressure formation in the deep section at 3500 and 3550m, where there are many formation fluids, low flow velocity, low bottom layer density, good electrical conductivity, high permeability and porosity, and it is necessary to inject high-fraction and medium-concentration polymer in the third flow channel ,.

[0119] (1) Medium injection

[0120] According to the site conditions, analyze the geological data of the formation, select the initial injection pressure and injection flow rate, open the third flow channel wellhead c...

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Abstract

The invention provides a multi-media separated injection system and method. A multi-media separated injection pipe column device comprises a first passageway, a second passageway, a third passageway and a fourth passageway, wherein the first passageway is provided with a first pipeline for injecting a first medium to a first-depth well section, the second passageway is provided with a second pipeline for injecting a second medium to a second-depth well section, the third passageway is provided with a third pipeline for injecting a third medium to a third-depth well section, two decenter injection proration devices connected in series are arranged at the bottom of the third pipeline, the fourth passageway is provided with a fourth pipeline which can contain the first pipeline, the second pipeline and the third pipeline, and a first single-pipe packer, a second single-pipe packer, a three-pipe packer and a double-pipe packer are contained in the fourth pipeline. The different media are injected to the well sections of different depths through the four passageways, and therefore the multiple media can be injected to the different sections at the same time, the borehole operation can be monitored in real time and adjusted instantly aboveground, the petroleum recovery efficiency is improved, and the system and method are suitable for production of a mine field complex oil reservoir.

Description

technical field [0001] The invention relates to the technical field of oilfield exploitation, in particular to an uphole control system and control method for multi-medium injection flow applicable to complex oil layers in mine fields. Background technique [0002] The oilfield development has entered the tertiary production stage; the conventional injection method can only inject medium one by one, which is time-consuming and laborious, and it will cause a lot of loss to the oil casing. After the instrument fails, it needs to be fished out and the maintenance is difficult. Conventional injection methods are difficult to monitor and cannot reflect the impact of injection volume on formations in real time; therefore, conventional medium injection methods can no longer meet the current injection requirements. [0003] In view of the shortcomings of conventional injection methods, the prior art provides two types of injection devices: one type of injection device can inject a s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/14E21B43/12E21B43/22
Inventor 宋考平刘丽皮彦夫李静王梅杨钊杨二龙孙宁
Owner NORTHEAST GASOLINEEUM UNIV
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