Intelligent separate injection fixed threshold control layered flow allocation method

An intelligent, high-flow technology, applied in the direction of mining fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of heavy survey and adjustment workload, rapid decline in inspection and matching qualification rate, and frequent obstructions in survey and adjustment, achieving Reduce operational risks and costs, overcome the inability to calibrate, and ensure accurate measurement effects

Inactive Publication Date: 2019-05-21
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] With the deepening of oilfield development, the number of separate injection wells is increasing year by year, the workload of measurement and adjustment is heavy, and the cost of supporting measurement and adjustment is increasing year by year; the downhole flow rate cannot be calibrated in the downhole, and the measurement and adjustment encounter frequent obstructions, resulting in the cost of string detection and pressure operation in the later stage High; Affected by factors such as pressure fluctuations and changes in formation water absorption capacity, the inspection and matching qualification rate drops rapidly, making it difficult to meet the needs of fine layered water injection in oilfields

Method used

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  • Intelligent separate injection fixed threshold control layered flow allocation method

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Effect test

Embodiment 1

[0035] A layered flow allocation method for an intelligent pipe string, characterized in that it comprises the following steps:

[0036] Step 1, sending a first instruction, the first instruction is to open the intelligent water distributor on the lowest distribution level, and close the intelligent water distributor on the layer outside the lowest distribution level;

[0037] Step 2: Send an instruction to adjust the opening of the smart water distributor at the lowest distribution level;

[0038] Step 3: Obtain the real-time flow rate of the surface flowmeter. At this time, the real-time flow rate of the surface flowmeter is equal to the real-time flow rate of the smart water distributor at the lowest distribution level. Compare the real-time flow rate of the smart water distributor at the lowest distribution level with the design configuration of the lowest distribution level. The relationship between injection volume;

[0039] Step 4, if the real-time flow rate of the int...

Embodiment 2

[0083] This embodiment is improved on the basis of Embodiment 1. Before the first step, a trial injection is performed to determine the dispensing pressure for measurement and adjustment.

[0084] The dispensing pressure mentioned above is the reference value of the dispensing amount of each layer corresponding to the injection pressure when measuring and adjusting the dispensing.

[0085] During the test injection, the multi-layer combined injection method is adopted, all the water distributors of each layer are fully opened, and the constant flow control of the ground controller is used. The sum of the design charge of all the layers of the column.

[0086] During the test injection, the multi-layer injection method is adopted, all the water distributors of each layer are fully opened, and the constant flow control of the ground controller is used to control the sum of the actual water injection volumes of all distribution layers of the intelligent pipe string. 120-140% of ...

Embodiment 3

[0117] Such as figure 1 Shown, it is improved on the basis of embodiment 1 and embodiment 2,

[0118] The steps 1 to 15 are based on the digital intelligent dispensing of fluid wave code communication, and realize the sending and operation of deployment instructions from the ground to the underground through the control software by means of wave code communication on the ground.

[0119] The present invention is based on the digital intelligent dispensing of fluid wave code communication, and realizes the sending and operation of deployment instructions from the ground to the underground through the control software on the ground by means of wave code communication. The operation is simple and the accuracy is high, which overcomes the problem that the downhole flow rate cannot be calibrated in the downhole. At the same time, it eliminates the need to go to the test vehicle for cable or steel wire fishing test deployment in the conventional injection process, ensuring long-term...

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Abstract

The invention discloses a layered flow allocation method for an intelligent pipe column. The method comprises the following steps of: under a fixed threshold control mode, firstly carrying out injection allocation from a lowest injection allocation layer according to the designed injection allocation amount of each layer, and carrying out measurement and adjustment by adopting an addition principle according to the flow of a ground flow meter during measurement and adjustment. On the basis of digital intelligent dispensing of fluid wave code communication, sending and operation of a ground-to-underground allocation instruction are achieved on the ground in a wave code communication mode through control software. Operation is simple, precision is high, the problem that the underground flowcannot be calibrated underground is solved; meanwhile, the procedure that a conventional separate injection process needs a test vehicle to carry out cable or steel wire casting and salvage test and allocation is omitted, long-term accurate metering of underground flow is guaranteed, underground flow calibration and allocation operation can be carried out without moving a pipe column, the operation risk and cost are reduced, and flow calibration can be carried out in a layered mode.

Description

technical field [0001] The invention belongs to the technical field of oilfield water injection, and in particular relates to an intelligent distribution injection fixed threshold control layered flow allocation method. Background technique [0002] At present, steel wire operation and cable operation are mainly used for test deployment of layered water injection wells in oilfields. The steel wire operation is controlled by the control platform of the ground well testing vehicle, and the steel wire is pulled up and down repeatedly to replace the fixed water nozzle. The cable operation is controlled by the ground well test vehicle control platform. Realize the function of adjusting while measuring. [0003] With the deepening of oilfield development, the number of separate injection wells is increasing year by year, the workload of measurement and adjustment is heavy, and the cost of supporting measurement and adjustment is increasing year by year; the downhole flow rate can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/20E21B43/14
Inventor 胡改星姚斌于九政姬振宁杨玲智毕福伟王子建刘延青隋蕾王薇
Owner PETROCHINA CO LTD
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