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A Drilling Fluid Inhibition Evaluation Method

A suppression evaluation and drilling fluid technology, which is applied in the direction of material analysis, measuring devices, and instruments using sound waves/ultrasonic waves/infrasonic waves. problems, such as inability to conduct drilling field test evaluation, etc., to achieve the effect of wide application range, short test cycle and real evaluation effect

Active Publication Date: 2017-06-06
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The disadvantages or deficiencies of these technologies are: ① most of them are relatively complex and large-scale instruments, the experimental operation is cumbersome, the experiment time is long, suitable for indoor research, and cannot be used for experimental evaluation on the drilling site; ② most of the evaluation instruments for fracture plugging effect , there is no special research on the plugging effect of micro-cracks (cracks with a crack width of 100 microns or less than 150 microns), and the evaluation effect has certain limitations
③Indices such as drilling fluid HTHP filtration loss and HTHP seepage loss cannot truly simulate the plugging situation of drilling fluid, and the evaluation effect is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A drilling fluid inhibition evaluation method mainly uses the CWT-200 acoustic velocity meter to measure the acoustic wave transmission rate of the core slice soaked in the drilling fluid, so as to investigate the plugging performance of the drilling fluid.

[0025] The implementation steps of this method are as follows:

[0026] ① Slice and number the same core, measure the height and length of the core, and put the core in the formation aqueous solution to evacuate to remove the air in the rock sample.

[0027] ②Put the treated core into the filtrate of the high-temperature and high-pressure fluid loss tester filled with drilling fluid, raise the temperature and pressurize according to the standard program, and stand still at 150°C and 4.1MPa for 8 hours.

[0028] ③After taking out the core, clean the sediment on the surface of the core, and then measure the sound wave transmission rate on the CWT-200 sound wave velocity meter.

[0029] ④ Through the results of the a...

specific Embodiment 2

[0031] ① Slice and number the same core, measure the height and length of the core, and put the core in the formation aqueous solution to evacuate to remove the air in the rock sample.

[0032] ②Put the treated cores into the filtrate of the 42-type high-temperature and high-pressure fluid loss tester filled with drilling fluid A and drilling fluid B, and heat up and pressurize according to the standard program (see industry standard SY / T5621-93), Stand still at 150°C and 4.1MPa for 8 hours (during the experiment, the lower valve stem of the tester was always closed).

[0033] ③After taking out the core, clean the sediment on the surface of the core, and then measure the sound wave transmission rate on the CWT-200 sound wave velocity meter.

[0034] The experimental results are as follows:

[0035] The acoustic wave transmission velocity of drilling fluid A is 15389m / s, and the acoustic wave transmission velocity of drilling fluid B is 13406m / s. From the results, it can be s...

specific Embodiment 3

[0037] ① Slice and number the same core, measure the height and length of the core, and put the core in the formation aqueous solution to evacuate to remove the air in the rock sample.

[0038] ②Put the processed cores into the filtrate of the 42-type high-temperature and high-pressure fluid loss tester filled with drilling fluid C and drilling fluid D, and heat up and pressurize according to the standard program (see industry standard SY / T5621-93), Stand still at 150°C and 4.1MPa for 8 hours (during the experiment, the lower valve stem of the measuring instrument was always closed).

[0039] ③After taking out the core, clean the sediment on the surface of the core, and then measure the sound wave transmission rate on the CWT-200 sound wave velocity meter.

[0040] The experimental results are as follows:

[0041] The acoustic wave transmission velocity of drilling fluid C is 9030m / s, and the acoustic wave transmission velocity of drilling fluid D is 12627m / s. From the resul...

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Abstract

The invention provides a drilling fluid inhibition evaluation method, which comprises the following steps: stimulating the situation that the drilling fluid plugs stratum rock by soaking slabbed core in the drilling fluid under high-temperature and high pressure conditions, then determining the relative rock strength of the slabbed core by utilizing a CWT-200 sound wave tachometer, thus reflecting the plugging performance of the drilling fluid. According to the drilling fluid inhibition evaluation method, the experiment period is short, the operability is strong, the experiment processes are simple, the device is convenient to carry, and can be used for indoors experiment research, and can be used for evaluating the performance of the drilling fluid on the drilling site; the situation that the drilling fluid plugs the stratum rock can be better simulated, the evaluation effect is more real, and the guidance on the drilling construction is stronger.

Description

technical field [0001] The invention relates to a drilling fluid property evaluation method in petroleum exploration, in particular to a drilling fluid inhibition evaluation method. Background technique [0002] Shale micro-cracks are one of the important causes of borehole wall collapse. When the mud shale meets water, due to the capillary action, the water invades the rock along the micro-fractures, resulting in hydration, which disperses the mud shale and causes the instability of the borehole wall. Therefore, when drilling in shale formations, it is necessary to strengthen the plugging ability of drilling fluid and improve the plugging effect of micro-fractures. [0003] Indoor evaluation of the plugging ability of drilling fluid can improve the pertinence and effect of on-site application. At present, there are many domestic methods for evaluating the inhibitory properties of drilling fluids. For example, the widely used FA type non-permeable drilling fluid fluid los...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/024
Inventor 刘振东李公让乔军周守菊侯业贵高杨孙怡
Owner CHINA PETROCHEMICAL CORP