Method for realizing intelligent separate injection by utilizing opening degree of water nozzle in separated layer water injection

A layered water injection and faucet technology, which is applied in the direction of mining fluid, earthwork drilling, wellbore/well parts, etc., can solve the problem of changing faucet and other problems, and achieve the effect of reducing workload and improving economy

Pending Publication Date: 2020-12-18
南京南大数字科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the traditional problem of needing labor to change the nozzle. Now it is only necessary to control the opening of the nozzle by command, and to provide a method for intelligent dispensing by using the opening of the nozzle in layered water injection.

Method used

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  • Method for realizing intelligent separate injection by utilizing opening degree of water nozzle in separated layer water injection
  • Method for realizing intelligent separate injection by utilizing opening degree of water nozzle in separated layer water injection
  • Method for realizing intelligent separate injection by utilizing opening degree of water nozzle in separated layer water injection

Examples

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Embodiment 1

[0049] Example 1: 2 7 / 8in tubing is run into a well, the tubing depth is 1000m, the design wellhead water injection pressure is 10MPa, and the layered injection volume is 34m3 / d for the first layer, 39m3 / d for the second layer, and 39m3 / d for the third layer. 24m3 / d, try to select the water nozzle opening of each floor water distributor. Table 1 and Table 2 show the stratified water absorption profile data and the whole well indication curve data measured in this well.

[0050] Table 1 Water absorption scale of intervals.

[0051] layer Relative water absorption% first small layer 33.3 second sublayer 39.6 third sublayer 27.1

[0052] Table 2 is the data table of all well indication curves.

[0053] Water injection method* Oil pressure MPa Water injection m3 / d positive bet 8.2 230 positive bet 7.8 196 positive bet 7.3 156 positive bet 6.8 120

[0054] In this field, water injection from oil pipe...

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Abstract

The invention provides a method for realizing intelligent separate injection by utilizing the opening degree of a water nozzle in separate layer water injection. The method for realizing intelligent separate injection by utilizing the opening degree of the water nozzle in the separate layer water injection comprises the following steps of: obtaining a linear relationship between the opening degreeof the water nozzle and a flow coefficient through an experiment, and controlling the water injection quantity of each layer section by utilizing the overflowing capacity of different water nozzles and the generated pressure loss to achieve the purpose of separated layer quantitative water distribution. The size of a water distribution nozzle is obtained through a nozzle loss curve method; groundequipment sends information through pressure waves to set the opening degree of a water nozzle of an intelligent water distributor, so that the overflowing area of the water nozzle is changed, and the expected injection allocation amount is achieved. According to the method for realizing intelligent separate injection by utilizing the opening degree of the water nozzle in the separate layer waterinjection, the problem that the size of the water nozzle needs to be changed through labor in a traditional method is solved, the intelligent water distributor only needs to simply send an instruction, and the operation amount of water well injection allocation is greatly reduced. The intelligent water distributor has great significance in improving the economical efficiency and the flexibility of separate injection.

Description

technical field [0001] The invention relates to the technical field of layered water injection in oilfields, in particular to an intelligent distribution problem for layered water injection by utilizing the opening of water nozzles in layered water injection. Background technique [0002] At present, the traditional layered water injection in oilfields requires labor to change the size of the nozzle, which requires a lot of work and is not economical. [0003] The most commonly used methods for selecting downhole nozzles in oil fields are nozzle loss curve method, principle deduction method and simple calculation method. The technical scheme of the present invention establishes the nozzle loss equation, and makes experimentally the relation curves of faucet differential pressure and flow, the relation curve of faucet differential pressure square root and flow, the relation curve of opening degree and flow coefficient, and use the nozzle loss to obtain the opening of each lay...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/20
CPCE21B43/20
Inventor 夏英盛炜炜李瀚涛余宁
Owner 南京南大数字科技有限责任公司
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