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Well cementing method and device and storage medium

A cementing and density technology that is used in earth-moving drilling, wellbore/well components, construction, etc., and can solve problems such as gas intrusion and cement slurry leakage

Active Publication Date: 2020-04-10
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] This application provides a cementing method, device and storage medium, which can solve the problems of cement slurry leakage or gas invasion in cementing

Method used

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  • Well cementing method and device and storage medium
  • Well cementing method and device and storage medium
  • Well cementing method and device and storage medium

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Embodiment Construction

[0059] In order to make the purpose, technical solution and advantages of the present application clearer, the implementation manners of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0060] figure 1 It is a schematic flow chart of a cementing method provided in the embodiment of this application. see figure 1 , the method includes the following steps.

[0061] Step 101: Determine the safe density window of the well section to be sealed, and the safe density window refers to the density range between the gas-invasion pressure equivalent density and the leakage pressure equivalent density of the well section to be sealed;

[0062] Step 102: Based on the theoretical slurry column structure and the safe density window of the well section to be sealed, determine the slurry column displacement range and the actual slurry column structure of the well section to be sealed;

[0063] Step 103: Based on the slurry co...

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Abstract

The invention discloses a well cementing method and device and a storage medium, and belongs to the technical field of oil and gas field drilling. According to the method, a safety density window of ato-be-sealed well section is determined, then the slurry column displacement range and the actual slurry column structure are determined, and then the displacement efficiency of the to-be-sealed wellsection and the annulus dynamic equivalent density of each well cementing stage in a preset well depth are determined based on the slurry column displacement range and the actual slurry column structure, so that the annulus dynamic equivalent density of each well cementing stage in the preset well depth is smaller than the maximum boundary density of the safety density window, and the possibilityof leakage can be avoided. Then, based on the annulus dynamic equivalent density of the preset well depth and the minimum boundary density of the safety density window in each well cementing stage, awellhead pressure control value of each well cementing stage in the preset well depth is determined, so that the wellhead pressure is controlled through the wellhead pressure control value, the annulus dynamic equivalent density of each well cementing stage in the preset well depth is larger than the minimum boundary density of the safety density window, and thus the possibility of gas cut is avoided.

Description

technical field [0001] The present application relates to the technical field of oil and gas field drilling, in particular to a cementing method, device and storage medium. Background technique [0002] Cementing is an indispensable and important link in drilling operations. Cementing refers to the injection of cement slurry into the annular space between the wellbore and the casing during the drilling process, so as to seal the well section to be sealed by the cement slurry, and then isolate the oil layer, gas layer or water layer in the well section to be sealed. A job for a layer. Wherein, the wellbore refers to the space enclosed by the well wall of the oil and gas well. [0003] In related technologies, conventional well cementing methods are usually used for well cementing. Specifically, the slurry column structure of the cement slurry is determined according to parameters such as the downhole static formation pressure collected during the drilling process, the dept...

Claims

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Application Information

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IPC IPC(8): E21B33/13E21B47/005
CPCE21B33/13
Inventor 李斌郭建华郑有成李杰胡锡辉王锐曹权李维马旌伦马勇刘强文春宇苏强伍葳邵力
Owner PETROCHINA CO LTD
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