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Evaluation Method Using Multi-tube Cement Slurry Settlement Stability Evaluation Device

A technology for evaluating equipment and cement slurry, which is applied in the field of cementing and can solve problems such as impact

Active Publication Date: 2018-04-06
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this measurement method does not take into account the influence of temperature, pressure, and well deviation, and its test conditions are far from the actual downhole conditions. Often the cement slurry system with very little "free water" is measured at normal temperature and pressure. A large amount of free water is produced under high pressure conditions; thus affecting the real evaluation data

Method used

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  • Evaluation Method Using Multi-tube Cement Slurry Settlement Stability Evaluation Device
  • Evaluation Method Using Multi-tube Cement Slurry Settlement Stability Evaluation Device
  • Evaluation Method Using Multi-tube Cement Slurry Settlement Stability Evaluation Device

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Evaluation of different cement slurry systems under the same conditions at the same time and at the same inclination angle.

[0029] Two different cement slurry systems 1 and 2 are tested using a multi-tube cement slurry settlement stability evaluation device equipped with at least two test tubes 1. Under normal pressure, the inclination angle is 45 degrees and the curing temperature is 90°C. , when the static time is 2 hours, evaluate the settlement stability of the two cement slurry systems; the steps are as follows:

[0030] 1) Prepare cement slurry system 1 and cement slurry system 2 respectively;

[0031] 2) Curing the two cement slurries at 90°C for 20 minutes in an atmospheric thickener;

[0032] 3) Pour the two cured cement slurries into two experimental cylinders respectively, and seal them with movable rubber plugs;

[0033] 4) Install the experimental cylinder 1 on the bracket 2 by using the fixing clips respectively, adjust the rotation angle of the experi...

Embodiment 2

[0045] Evaluation of the same cement slurry system with the same conditions and different well inclination angles at the same time

[0046] Using a multi-tube cement slurry settlement stability evaluation device equipped with at least two test tubes 1, the same cement slurry system is tested under normal pressure with a well inclination angle of 45 degrees and 30 degrees, a curing temperature of 90 °C, and a static time of 2 hours. In the case of , evaluate its settlement stability; the steps are as follows:

[0047] 1) Prepare the cement slurry system as required;

[0048] 2) Curing the cement slurry at 90°C for 20 minutes in an atmospheric thickener;

[0049] 3) Pour the cured cement slurry into two experimental cylinders respectively, and seal them respectively with movable rubber plugs;

[0050] 4) Install the experimental tubes 1 on the bracket 2 with fixing clips, adjust the rotation angle of one of the experimental tubes 1 to 45 degrees, and the other to 30 degrees, a...

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Abstract

The invention discloses an evaluation method using a multi-cylinder cement mortar settlement stability evaluating apparatus. The experiment cylinders of the multi-cylinder cement mortar settlement stability evaluating apparatus can rotate. The method for evaluating the settlement stability of a cement mortar by using the apparatus comprises the following steps: 1, placing the cement mortar in the experiment cylinders, inserting movable rubber plugs to the inner cavities of the experiment cylinders, sealing the experiment cylinders, adjusting the rotating angles of the experiment cylinders to an angle needed by the experiments, fixing the experiment cylinders, and allowing the fixed experiment cylinders to stand; 2, moving out clear liquids at the upper layers of the cement mortars through using a pipette or a syringe, and measuring the volumes of the clear liquids; and 3, opening a valve externally connected with a connecting port, pushing the movable rubber plugs to pinch out the cement mortar, testing the densities of the cement mortars in different positions, and evaluating the settlement stability of the cement mortar. The method can meet the stability evaluation of different cement mortars at different hole drift angles, and allows data to be accurate.

Description

technical field [0001] The invention relates to the field of well cementing technology, in particular to a method for evaluating cement slurry settlement stability by using a multi-tube cement slurry settlement stability evaluation device. Background technique [0002] In cementing practice, the instability of cement slurry when it settles downhole often has adverse effects on cementing quality, especially in directional wells and horizontal wells. During this period, more "free water" is precipitated and accumulated at the top of the cement column, forming a channel in the annular space, leading to the occurrence of gas channeling. At the same time, due to the uneven density distribution caused by the cement slurry settlement under the action of gravity, the density of the upper cement slurry decreases, resulting in a decrease in the bonding strength between the cement stone, the formation and the casing, thus affecting the effective sealing of the annulus by the cement. T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/38
CPCG01N33/383
Inventor 宗勇付家文刘文明齐奔孙勤亮王芳高雪晴姚蓝
Owner BC P INC CHINA NAT PETROLEUM CORP