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Method for measuring and calculating absolute density of well-fixing cement

A technology of cementing slurry and absolute density, applied in the fields of calculation and measurement, to achieve the effect of easy acquisition and high measurement accuracy

Inactive Publication Date: 2009-10-14
托玛斯·艾伦
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It not only has high measurement accuracy but also does not affect the quality of cementing operations, and the equipment required for measurement is conventional measurement equipment, which is easy to obtain

Method used

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  • Method for measuring and calculating absolute density of well-fixing cement
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  • Method for measuring and calculating absolute density of well-fixing cement

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Embodiment Construction

[0085] see Figure 1-10 , the present invention will be further described below in conjunction with embodiment.

[0086] The present invention relates to a method of measurement and calculation, especially a method of measurement and calculation of the absolute density of cement slurry, which is unique in that it includes the following steps,

[0087] 1.1. Measure the initial density of the cement slurry under the initial pressure;

[0088] 1.2. Measure the density of the cement slurry again at a pressure different from the initial pressure;

[0089] 1.3. The absolute density of the cement slurry is calculated by applying the formula derived from the compressible air polynomial curve equation,

[0090] Dabs=D1 / (1-((D1 / D2-1) / ((P1 / P2) 1 / n -1))),

[0091] In the formula:

[0092] Dabs: absolute density,

[0093] D1: Density 1,

[0094] D2: Density 2,

[0095] P1: Absolute pressure when measuring density 1,

[0096] P2: absolute pressure when measuring density 2,

[0097...

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Abstract

The invention relates to a measuring and calculating method, in particular a method for measuring and calculating the absolute density of well-fixing cement. The method comprises the following steps: 1.1, measuring the initial density of grout under initial pressure; 1.2, remeasuring the density of the grout under the pressure different from the initial pressure; and 1.3, applying a multi-power curvilinear equation formula which is originated from compressible air to calculate the absolute density of the grout, i.e. Dabs=D1 / (1-((D1 / D2-1) / (P1 / P2)-1))). In the computing formula, Dabs=D1 / (1-((D1 / D2-1) / (P1 / P2)-1))), Dabs= absolute density, D1=density 1, D2=density 2, P1=absolute pressure during the measurement of the density 1, P2=absolute pressure during the measurement of the density 2, n=pressure-volume multi-power curvilinear equation index, and P1*V1=P2*V2. In the condition of constant temperature, if n=1.0, then the formula can be simplified into Dabs=D1 / (1-((D1 / D2-1) / (P1 / P2-1))). The invention has high measurement accuracy and does not influence the quality of the well fixation work, and devices used for the measurement are conventional measuring devices which can be easily obtained.

Description

technical field [0001] The invention relates to a measurement and calculation method, in particular to a measurement and calculation method for the absolute density of cement slurry. Background technique [0002] Some cementing slurries are entrained with air, and the air-entrained cement slurries will affect the measurement accuracy of the cement slurry density during the mixing operation. [0003] Although the existing density meter can accurately measure the density of the cement slurry, the density of the cement slurry it measures also includes the air entrained in the cement slurry. When this air-entrained slurry is pumped downhole, the pressure of the slurry tends to become very high, often as high as thousands of psi. This high pressure compresses the air trapped in the grout so that no voids remain in the grout. At atmospheric pressure, this will result in a cement slurry with air entrained at the bottom of the hole that is denser than it is at the wellhead. This ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N9/36G06F19/00
Inventor 托玛斯·艾伦
Owner 托玛斯·艾伦