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Method for multilayered system differentiation plugging

A multi-layered and differentiated technology, applied in earthwork drilling, sealing/isolation, wellbore/well components, etc., can solve problems such as large amount of slurry input, small amount of slurry input, unqualified pressure test, etc., to achieve Improve the plugging strength, ensure the plugging effect, and the effect of pressure balance

Inactive Publication Date: 2017-03-08
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0003] Because the non-potential layer to be plugged is a multi-layer oil layer, affected by comprehensive factors such as oil layer permeability and formation pressure, it is easy to cause a large amount of slurry in the low start-up pressure oil layer during the plugging process, and a large amount of slurry in the oil layer when the plugging pressure is raised. In the middle, due to the impact of water loss under high pressure, the high-pressure layer has not yet started or the amount of slurry is small, and the low-pressure layer loses water too quickly and "cement lumps" appear, resulting in the pressure being stable during the plugging process, and the pressure test after drilling. Qualified conditions, resulting in multiple blockages

Method used

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Embodiment Construction

[0017] The detailed description and technical contents of the present invention are as follows.

[0018] A method for differential plugging of multilayer systems, comprising the following steps:

[0019] The step of finding and determining the non-potential layer with high permeability in the multi-layer oil layer of the whole well section;

[0020] A step of sealing and sealing the non-potential layer with high permeability by using high displacement to squeeze in low-density cement slurry;

[0021] Squeeze high-density cement slurry with low displacement to carry out simultaneous plugging of the whole well section.

[0022] Both the low-density cement slurry and the high-density cement slurry are squeezed into the oil layer in the well by a cement pump truck. The low-density cement slurry extrusion process requires the displacement of the pump truck to be controlled between 200-300L / min, and the high-density cement slurry extrusion process requires the pump truck displacem...

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Abstract

The invention discloses a method for multilayered system differentiation plugging. The method comprises the following steps that a potential-free layer with the high permeability is found out and determined from multilayered system oil layers of a full well section; the potential-free layer with the high permeability is shielded and plugged by squeezing in low-density cement paste in a high-displacement mode; then, squeezing in high-density cement paste in a low-displacement mode is adopted for simultaneous plugging of the full well section. In order to solve the problem that the plugging effect is affected by different starting pressures of plugging layers when multilayered system potential-free oil layers need to be plugged at the same time, the stratum extrusion pressure is increased by shielding the potential-free layer with the high permeability by pumping in low-density cement paste in a large-displacement mode at first, the high-density cement paste is applied for simultaneous plugging of the full well section, the plugging strength is improved, and the plugging effect is ensured.

Description

technical field [0001] The invention relates to the cement plugging technology of the oil layer, in particular to a method for multi-layer differentiated plugging. Background technique [0002] In the process of oilfield development, most of the oil wells are exploited in multiple layers at the same time. Due to the impact of high water cut in the later stage, according to the requirements of oilfield development to control water and stabilize oil, it is necessary to change layers for production. In order to simplify the wellbore structure, the method of cement plugging is generally used for the layer series that has lost production potential. At present, the same density cement slurry is used to plug the non-potential layer to prevent affecting the normal production of the oil well after the layer is modified. [0003] Because the non-potential layer to be plugged is a multi-layer oil layer, affected by comprehensive factors such as oil layer permeability and formation pres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13
Inventor 张江张丁涌刘伟郑裕庆刘军于辉莉张涛田华东马小虎孙凯
Owner CHINA PETROLEUM & CHEM CORP
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