Engineering simulation set and method for quantitative evaluation of flushing efficiency of cementing pre-flushing fluid

A technology for cementing pre-fluid and simulation and quantification, which is applied in the field of petroleum drilling engineering, can solve the problem that the optimal amount of pre-fluid, flushing time, and displacement construction parameters cannot provide scientific guidance, and cannot truly simulate the existence of filter cake in the well. It can reduce the experimental workload, visualize the process, and optimize the flushing time.

Active Publication Date: 2015-06-03
SOUTHWEST PETROLEUM UNIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Generally speaking, the current evaluation device or evaluation method mainly has the following two deficiencies: (1) It cannot truly simulate the existence of filter cake in the well
In the existing evaluation method, the filter cake is formed by immersing the core in the drilling fluid, which cannot truly reflect the situation that the drilling fluid forms a dense filter cake on the surface of the borehole wall under the action of the pressure difference in the well. Much harder to remove than sticky drilling flu...

Method used

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  • Engineering simulation set and method for quantitative evaluation of flushing efficiency of cementing pre-flushing fluid
  • Engineering simulation set and method for quantitative evaluation of flushing efficiency of cementing pre-flushing fluid
  • Engineering simulation set and method for quantitative evaluation of flushing efficiency of cementing pre-flushing fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Example 1 Drilling Fluid Flushing Efficiency Test Experiment

[0045] In a well in western Sichuan, a 139.70mm casing was run in a 215.90mm diameter hole, and the drilling fluid system was used with a density of 1.52g / cm 3 The sulfonated drilling fluid system is designed to replace the drilling fluid with pad fluid A at an annular return velocity of 0.8m / S, and the design flushing time is 15min. The evaluation device and method of the present invention are used to evaluate the flushing efficiency of prefluid A under the operating parameter conditions.

[0046] In the first step, the mass of the artificial rock core is weighed to be 112.36g. The second step is to put the artificial rock core in the high temperature and high pressure water loss instrument, pour in the drilling fluid on site and cover the core, use a nitrogen bottle to inject a pressure of 3.5MPa into the high temperature and high pressure water loss instrument, and release the pressure after 20 minutes t...

Embodiment 2

[0047] The optimization of embodiment 2 preflush flushing time

[0048] The steps are the same as in Example 1, other conditions remain unchanged, only the flushing time of the pre-fluid A is extended, and the variation of the flushing efficiency with the flushing time is investigated, the test results are as follows image 3 shown. From image 3 It can be seen that the flushing efficiency is 82.95% when the flushing time reaches 15 minutes, and the result is consistent with the result of Example 1. It also shows that the flushing efficiency under different flushing time conditions can be evaluated by extending the flushing time by using the device of the present invention, and a large number of Save experimental workload. When the flushing time reaches more than 23 minutes, the flushing efficiency remains at about 94% and does not change, indicating that under the condition of 0.8m / s annular velocity, the preflush flushing time must be designed at least 23 minutes to obtain...

Embodiment 3

[0049] The optimization of embodiment 3 prefluid return velocity

[0050] On the basis of Example 1, other conditions remain unchanged, except that the annulus return velocity of the prefluid A is increased to 1.0m / s, and the corresponding core rotation speed is increased to 478r / min, and the flushing efficiency after flushing for 15 minutes is investigated, and the following is obtained The final flushing efficiency is 90.48%, the test results are as follows Figure 4 shown. From Figure 4 It can be seen from the figure that when the return speed is increased, the flushing efficiency increases rapidly in the early stage, and gradually tends to be stable in the later stage, indicating that properly increasing the return speed can improve the flushing efficiency when the amount of prefluid is insufficient or the sealing section is long.

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Abstract

The invention discloses an engineering simulation set and method for quantitative evaluation of flushing efficiency of cementing pre-flushing fluid. The set mainly comprises a support, a bearing disc, an artificial core, a core holder, a variable speed motor, a mass sensor and a computer acquiring terminal. A height adjusting fixture is disposed on the support. A slurry cup for holding cementing pre-flushing fluid is disposed on the bearing disc. The height adjusting fixture is connected with the mass sensor, the variable speed motor and the core holder in order. The core holder is used for holding the artificial core. By adjusting the speed of the variable speed motor, speed of the artificial core in the pre-flushing fluid is controlled to simulate construction displacement. The mass sensor connected with the computer acquiring terminal is used for acquiring, recording and storing, in real time, mass changes of a filter cake on the surface of the artificial core and calculating flushing efficiency so as to draw curves. The engineering simulation set and method has the advantages that a principle is reliable, operating is simple, full-course quantitative evaluation and analysis of flushing efficiency is achieved, and basis is provided for the optimization of pre-flushing fluid systems, the optimization of pre-flushing fluid performance and the optimization of construction parameters such as flushing time and displacement.

Description

technical field [0001] The invention relates to an evaluation device and method for flushing efficiency of cementing prefluid in well cementing engineering in the field of petroleum drilling engineering. Background technique [0002] Improving the interface bonding quality between cement stone, casing and well wall is the most important link to ensure the quality of cementing. However, due to the incompatibility between drilling fluid and cement slurry, the adhesion on the casing wall The drilling fluid and the filter cake formed by the dehydration of the drilling fluid on the well wall will directly affect the bonding quality of cement stone, casing and well wall. In order to improve the cementing quality of the cementing interface and prolong the production life of oil and gas wells, it is necessary to inject a liquid slug into the well before cementing to clean the well wall and casing wall, which is called pre-fluid. After years of research, considerable progress has be...

Claims

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Application Information

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IPC IPC(8): E21B21/00E21B49/00
CPCE21B21/00E21B49/00E21B49/005
Inventor 李早元辜涛郭小阳程小伟李明欧红娟柳洪华
Owner SOUTHWEST PETROLEUM UNIV
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