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A safety control method for acidizing operation to prevent packer failure

A safety control and packer technology, applied in the direction of earthwork drilling, wellbore/well components, production fluid, etc., can solve problems such as the sealing ability of pipe string joints that do not consider the tensile capacity of the packer, and improve the acidizing operation effect, expand the pressure control window, prevent the effect of seal failure or fracture failure

Active Publication Date: 2022-02-01
BC P INC CHINA NAT PETROLEUM CORP +1
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AI Technical Summary

Problems solved by technology

[0004] The main problems in the existing technology: the acidizing pressure is designed based on the internal pressure resistance of the tubing string, and the annular pressure is calculated based on the API RP 90 standard, without considering the tensile capacity of the packer and the sealing capacity of the string joint

Method used

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  • A safety control method for acidizing operation to prevent packer failure
  • A safety control method for acidizing operation to prevent packer failure
  • A safety control method for acidizing operation to prevent packer failure

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Embodiment Construction

[0035] The invention provides a safety control method for acidizing operation to prevent packer failure, which is used for the safety of operating parameters such as oil pressure, temperature, and casing pressure during the acidizing operation of complex gas wells (three-high gas wells, gas storage wells, etc.) control, improve the effectiveness of acidizing operations, and prevent packer failure.

[0036] see figure 1 , the present invention a kind of acidizing operation safety control method that prevents packer failure, comprises the following steps:

[0037] S1. According to the formula (51) in the SY / T 7370 standard, calculate the axial load Fe generated by running and setting the tubing string at any well depth L, and calculate the packer setting depth Lp according to the formula (60) in the SY / T 7370 standard Axial load Fp on the packer;

[0038] S2. Knowing the oil pressure Pi, flow rate Q, temperature T, casing pressure Po, outer diameter D and wall thickness t of t...

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Abstract

The invention discloses a safety control method for acidizing operation to prevent packer failure. According to the operating condition parameters of acidizing operation, the tensile load at the packer and the maximum compressive load of the tubing string can be calculated step by step, and whether the load exceeds the standard can be judged. Allowable range, determine the safe load that the string can withstand, draw the safe operation chart under different oil pressures, further give the safe operating temperature and the range of casing pressure that can be applied, expand the pressure control window, and divide the operation danger area, warning zone and safety zone, effectively prevent the sealing failure of tubing string and packer, and improve the effect of acidizing operation.

Description

technical field [0001] The invention belongs to the technical field of oil recovery engineering, and in particular relates to a safety control method for acidizing operations for preventing packer failure. Background technique [0002] In the acidizing and fracturing process of tubing in complex gas wells, the acidizing operation is designed considering the internal pressure bearing capacity of the tubing string. Under the influence of pressure and temperature, the tubing string generates tensile load. If the tensile load is too large, it will easily lead to sealing. The failure of the packer, for example, during the acid fracturing process of wells H23 and H3 in the western gas field, the pins were broken due to excessive tensile load, and then the seal of the packer insertion tube failed. [0003] At present, reducing the acidizing pressure (oil pressure) is one of the main ways, but reducing the pressure will seriously affect the acidizing effect. In order to ensure the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/27E21B49/00
CPCE21B43/26E21B49/00
Inventor 王建军李方坡杨尚谕池明路彩虹李丽锋孙建华
Owner BC P INC CHINA NAT PETROLEUM CORP
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