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Method for testing plugging effect of leakage-proof plugging system while drilling

A test method and leak-proof technology, which is applied in measuring devices, suspension and porous material analysis, scientific instruments, etc., can solve problems such as time-consuming, economic loss, and delay of drilling time, and achieve simple test steps and high test accuracy , The effect of reducing the cost of testing

Inactive Publication Date: 2013-03-27
王维
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AI Technical Summary

Problems solved by technology

[0008] The existing plugging methods have their own advantages and disadvantages, but in general they all delay the drilling time more or less and reduce the drilling efficiency. For example, the static plugging method needs to stop drilling. Leakage material changes the performance of the drilling fluid, and it is necessary to readjust the formula of the drilling fluid, etc., which will consume a lot of time, bring great inconvenience to drilling, and lead to large economic losses

Method used

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Examples

Experimental program
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Embodiment

[0026] The invention relates to a method for testing the plugging effect of a leakage prevention and plugging system while drilling, including the following steps:

[0027] (a) Use standard salt water to soak the core in order to maintain the original properties of the core to the greatest extent;

[0028] (b) Measure the permeability before plugging;

[0029] (c) Blocking;

[0030] (d) Measure the permeability after plugging;

[0031] (e) Permeability recovery value test.

[0032] In the step (a), the standard brine composition by mass: 2.0% KCl + 5.5% NaCl + 0.45% MgCl 2 +0.55%CaCl 2 .

[0033] In the step (a), the prepared standard brine is vacuum degassed for 1 hour.

[0034] In the step (b), the specific steps are: install the core in the core holder and heat it to the required temperature; increase the confining pressure to the preset pressure by the hand pump; open the advection pump to increase the pressure to the preset pressure; Inject standard brine into the core at pump speed;...

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Abstract

The invention discloses a method for testing plugging effect of a leakage-proof plugging system while drilling. The method comprises the steps of (a) applying standard salt water to soak a rock core, so as to keep original properties of the rock core to the greatest extent; (b) measuring permeability before plugging; (c) plugging; (d) measuring the permeability after plugging; and (e) carrying out permeability recovery value test. With the adoption of the method provided by the invention, the plugging effect of the leakage-proof plugging agent while drilling can be rapidly tested; the test precision is high, and the test steps are simple; and the test cost is greatly reduced.

Description

Technical field [0001] The invention relates to a method for testing the plugging effect of a leakage prevention and plugging system while drilling. Background technique [0002] Lost circulation is the pressure difference of working fluids (including drilling fluid, cement slurry, completion fluid and other working fluids) during various downhole operations such as drilling, cementing, testing or workover in oil and natural gas exploration and development. Under the action, a complicated downhole situation that leaks into the formation is one of the most common and common technical problems in drilling engineering. The reason why it is called a complex underground situation is that most of its occurrence is not caused by man-made, and it is not shifted by human will. Of course, this statement is not accurate enough. If you encounter a leakage channel that can produce lost circulation, but take corresponding effective measures, then it is possible that lost circulation will not ...

Claims

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Application Information

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IPC IPC(8): G01N15/08
Inventor 王维
Owner 王维
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