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Preparation method of drilling core containing acid liquor indicator

A technology of indicator and cuttings, which is applied in the field of preparation of cuttings cores containing acid liquid indicators, can solve the problems that the pertinence and effectiveness of measures cannot be guaranteed, the effect is not ideal, and the consistency of artificial cores cannot be guaranteed. Achieve good indication effect, easy operation, simple production method

Active Publication Date: 2011-01-26
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] For the multi-reservoir sandstone in Dagang Oilfield, acidizing measures also play a very important role in the production increase measures of Dagang Oilfield, and the annual workload is gradually increasing. For any block, as long as there is fluid entering from drilling to taking measures Carry out the compatibility test between the fluid entering the well and the natural core, and the natural core is a non-renewable resource, which is very precious. The general artificial core cannot guarantee the consistency with the real formation, and the compatibility test is not very effective, which leads to the targeted measures and validity cannot be guaranteed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Example 1: Drilling cores from the Guantao formation

[0011] Drilling cuttings preparation: The drilling cuttings raw materials are washed with petroleum ether, and 80 grams of the treated cuttings are weighed.

[0012] Preparation of adhesive: Weigh 14 grams of epoxy resin, 2 grams of ethylenediamine, 2 grams of acetone and 1 gram of methyl red.

[0013] Core preparation: put the drill cuttings in an oven at 95°C, dry for 3 hours, and add 1 g of crystal violet after cooling.

[0014] Stir the cement and drill cuttings raw materials evenly, put them into the mold and press 7Mpa to 10Mpa for 12 hours.

[0015] The mold was disassembled, and the core was dried in a 95°C oven for 6 hours, and cooled to room temperature naturally.

[0016] A drill cutting core containing an acid indicator was obtained, and the core weight was 100 grams.

Embodiment 2

[0017] Example 2: Shahejie Formation Drilling Cores

[0018] Drilling cuttings preparation: The drilling cuttings raw materials are washed with petroleum ether, and 40 grams of the treated cuttings are weighed. Preparation of adhesive: Weigh 7 g of epoxy resin, 1 g of ethylenediamine, 1 g of acetone and 0.5 g of methyl red.

[0019] Core preparation: put the drill cuttings in an oven at 95°C, dry for 3 hours, and add 0.5 g of crystal violet after cooling.

[0020] Stir the cement and drill cuttings raw materials evenly, put them into the mold and press 7Mpa to 10Mpa for 12 hours.

[0021] The mold was disassembled, and the core was dried in a 95°C oven for 6 hours, and cooled to room temperature naturally. A drill cutting core containing an acid indicator was obtained, and the core weight was 50 grams.

Embodiment 3

[0022] Example 3: Drilling cuttings core in Minghua formation

[0023] Drilling cuttings preparation: The drilling cuttings raw materials are washed with petroleum ether, and 25 grams of the treated cuttings are weighed. Preparation of cement: 4.375 g of epoxy resin, 0.625 g of ethylenediamine, 0.625 g of acetone and 0.31 g of methyl red were weighed.

[0024] Core preparation: put the drill cuttings in an oven at 95°C, dry for 3 hours, and add 0.31 g of crystal violet after cooling.

[0025] Stir the cement and drill cuttings raw materials evenly, put them into the mold and press 7Mpa to 10Mpa for 12 hours.

[0026] The mold was disassembled, and the core was dried in a 95°C oven for 6 hours, and cooled to room temperature naturally. A drill cutting core containing an acid indicator was obtained, and the core weight was 31 grams.

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PUM

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Abstract

The invention relates to a preparation method of drilling core containing acid liquor indicator, which comprises the following components as calculated by the total weight 100% of the drilling core: 14% of epoxy resin, 2% of quadrol, 2% of acetone and 1% of methyl red. The preparation method has the following steps: mixing the above components; weighting the rock waste raw materal accounting for 14% of the total weight of the drilling core, and washing an performing oil treatment on the raw material by petroleum ether; drying for 3h under the temperature of 95 DEG C, cooling and adding 1% crystal violet; stirring a cementing agent with the rock waste raw material evenly, placing the mixture in a die and pressurizing by 7MPa-10MPa for 12h; and dismantling the die, drying the drilling core for 6h at the temperature of 95 DEG C, and naturally cooling to room temperature. The permeability, water sensitivity, salt sensitivity, velocity sensitivity, acid sensitivity and alkali sensitivity of the drilling core in the invention are similar to those of the natural core, which is proved by a stepped permeability tester and five-sensitivity tests; and the drilling core has good indicating effect on acid liquor.

Description

technical field [0001] The invention relates to a method for preparing cores in the fields of oilfield geology and chemistry, in particular to a method for preparing drill cuttings cores containing an acid indicator. Background technique [0002] Dagang Oilfield is a sandstone with multiple oil layers. Acidizing measures also play a very important role in the production increase measures of Dagang Oilfield, and the annual workload is gradually increasing. For any block, from drilling to taking measures, as long as there is fluid entering, it is necessary to The compatibility test between the fluid entering the well and the natural core is carried out, and the natural core is a non-renewable resource and is very precious. The general artificial core cannot guarantee the consistency with the real formation, and the effect of the compatibility test is not ideal, resulting in targeted measures. and validity cannot be guaranteed. SUMMARY OF THE INVENTION [0003] The purpose o...

Claims

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Application Information

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IPC IPC(8): G01N1/28B28B3/00B28B11/24
Inventor 贾振福马超李春德段理胡成亮袁润成纪朝凤马先平魏玉莲张秀梅周爽
Owner PETROCHINA CO LTD
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