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Drilling fluid leak prevention and plugging effect evaluation experimental system

An experimental system and drilling fluid technology, which can be used in earth-moving drilling, flushing wellbore, wellbore/well components, etc., which can solve the problems of inability to quantitatively give the parameters of the lost formation and the authenticity of the leakage.

Active Publication Date: 2022-04-29
CHINA NAT OFFSHORE OIL CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the above two experimental devices have certain limitations in the authenticity of the leakage, and cannot quantitatively give the parameters of the leakage formation.

Method used

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  • Drilling fluid leak prevention and plugging effect evaluation experimental system
  • Drilling fluid leak prevention and plugging effect evaluation experimental system
  • Drilling fluid leak prevention and plugging effect evaluation experimental system

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Embodiment Construction

[0034] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "inner" and "outer" are only for the convenience of describing the present invention and simplifying the description, rather than indicating Or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limiting the invention.

[0035] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0036] like Figure 1 to Figure 4 As shown, one embodiment of the drilling fluid leakage prevention and plugging effect evaluation experimental system of the pr...

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Abstract

The invention relates to the technical field of drilling fluid leakage prevention and plugging, and discloses an experimental system for evaluating the effect of drilling fluid leakage prevention and plugging, including: a pressurizing device, which is suitable for outputting compressed gas to form a predetermined experimental pressure; Cup, which includes a cup body with an inner cavity, the upper end of the cup body is connected with a pressurizing device, and the lower end of the cup body is provided with a liquid discharge port; the leakage model includes a permeable leakage model and a crack type leakage model selectively installed in the cup body The model is suitable for dividing the cup body into a pressurized chamber connected with the pressurizing device and a liquid leakage chamber connected with the liquid discharge port at the installation position, wherein the permeable leakage model is a columnar sand plate; It includes a columnar model body, the columnar model body has a crack suitable for connecting the pressurized chamber and the leakage chamber, and multiple seams are formed on the inner wall of the crack. The invention can more realistically simulate formation fracture type leakage and seepage type leakage.

Description

technical field [0001] The invention relates to the technical field of leakage prevention and plugging of drilling fluid, in particular to an experimental system for evaluating the effect of leakage prevention and plugging of drilling fluid. Background technique [0002] my country's South China Sea is rich in deep-water oil and gas resources and is the main replacement area for my country's oil production. In deepwater and ultra-deepwater drilling operations, as the water depth increases, formation fracture pressure becomes lower and lower, and the safe density window of drilling fluid narrows, resulting in frequent lost circulation in drilling operations. Deepwater well leakage brings serious harm to drilling operations, mainly in the following aspects: loss of a large amount of drilling fluid, resulting in expensive production costs; loss of riser drilling fluid, resulting in collapse of the riser; consumption of a large amount of plugging materials, increasing drilling c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B21/00E21B21/08E21B33/13E21B47/00E21B47/06
CPCE21B21/003E21B33/13E21B47/06E21B47/00E21B21/08
Inventor 颜帮川吴旭东蒋官澄黄熠欧阳铁兵陈浩东向雄徐超刁欢李占东张健邓正强贺垠博杨丽丽董腾飞
Owner CHINA NAT OFFSHORE OIL CORP
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