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A system and method for dynamic adjustment of flowback nozzle after shale gas horizontal well pressure

A dynamic adjustment, horizontal well technology, applied in the field of hydraulic fracturing technology, can solve the problem of inaccurate selection of oil injection nozzles, and achieve the effect of increasing single well productivity and improving recovery

Active Publication Date: 2020-12-08
CHENGDU CHUANGYUAN OIL & GAS TECH DEV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most sites rely on past experience to select the size of the fuel injector, which may easily lead to inaccurate selection of the fuel injector

Method used

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  • A system and method for dynamic adjustment of flowback nozzle after shale gas horizontal well pressure
  • A system and method for dynamic adjustment of flowback nozzle after shale gas horizontal well pressure
  • A system and method for dynamic adjustment of flowback nozzle after shale gas horizontal well pressure

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0033] Such as figure 1 As shown, a method for dynamically adjusting flowback nozzles after a shale gas horizontal well pressure of the present invention comprises the following steps:

[0034] Step 1. Determine the flow rate of well flushing and sand washing, the critical flow rate of well opening, and the time of well opening according to the flowback system before well opening;

[0035] According to the critical flow rate of the well opening, it is calculated by the formula:

[0036]

[0037] In the formula: Indicates the critical speed; Indicates the flowback liquid density; Indicates the proppant particle density; Indicates the proppant particle diameter;

[0038] Step 2, then determine the diameter of the initial choke according to the critical flow rate of opening the well;

[0039] Step 3: Use the initial choke simulation to open w...

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Abstract

The invention discloses a system and method for dynamic adjustment of flowback nozzles after shale gas horizontal well pressure, including a parameter setting unit for setting well washing and sand flushing flow rate, critical flow velocity of well opening, Opening time parameters; initial choke determination unit, used to determine the initial choke diameter by critical flow velocity of well opening; production factor calculation unit, used for calculation of production factor; flow factor calculation unit, used for calculation of flow factor; stress factor calculation The unit is used for the calculation of the stress factor; the damage factor calculation unit is used for the calculation of the damage factor; the test standard judgment unit is used for the judgment of the nozzle diameter. The invention can improve single well productivity and recovery rate EUR target.

Description

technical field [0001] The invention belongs to the technical field of hydraulic fracturing technology, and in particular relates to a dynamic adjustment system and method for flowback nozzles after shale gas horizontal well pressure. Background technique [0002] At present, the purpose of using proppant in the fracturing of tight reservoirs is to support hydraulic fractures and form longer sand-filled fractures with certain conductivity in the formation, thereby increasing the effective seepage area of ​​oil and gas wells. After a large number of on-site constructions, it was found that the flowback after oil and gas well pressure, especially in the production process, often causes proppant to enter the wellbore and generate backflow. Nowadays, more oil and gas wells are fractured in stages with external packers. The characteristics of this technology determine that once the horizontal well produces sand and buries the wellbore, it will affect the production of oil and gas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/26E21B43/12G06F30/20
CPCE21B43/12E21B43/26G06F30/20
Inventor 李延钧黄勇斌胡述清罗迪黄文强曾丽媛荣浩达
Owner CHENGDU CHUANGYUAN OIL & GAS TECH DEV