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A method for measuring the corrosion inhibition performance of acid liquid in oil field

A kind of acid liquid and oil field technology, which is applied in the direction of measuring devices, weather resistance/light resistance/corrosion resistance, instruments, etc., can solve the problems of untimely detection and damage to the pipe string, etc., and achieve the effect of short time, simple operation and low test cost

Active Publication Date: 2021-08-27
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a fast and convenient method for detecting the corrosion inhibition performance of acid liquid, to solve the problem of untimely detection of corrosion inhibition performance of acid liquid in oilfield acidification injection, and to avoid unqualified acid liquid from entering the well and damaging the pipe string

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The present embodiment provides a method for measuring the corrosion inhibition performance of acid liquid in an oil field, comprising the following steps:

[0029] S1 Drop 1.95~2.05ml of the acid solution to be tested into a test bottle containing 50ml of test solution, shake well to obtain a mixed solution;

[0030] S2 Take out the test piece from the test box, pierce the middle part of the test piece with a test piece piercing needle and put it back into the test box;

[0031] S3 pipette 10-11 mL of the mixed solution from the test bottle in step S1 and add it to the test box, so that the mixed solution completely submerges and wets the test piece pierced by the middle part;

[0032] S4 After waiting for 3 to 5 minutes, take out the test piece. A light-colored circle appears along the punctured center of the test piece. Use a ruler to measure the diameter of the circle;

[0033] S5 According to the size of the diameter of the circle measured in step S4, it is judged...

Embodiment 2

[0036] On the basis of Example 1, further, the method for judging whether the corrosion performance of the acid solution for acidizing in the oil field is up to standard is obtained by comparing 300 sets of experimental data, selecting acid solutions with different corrosion rates, and simultaneously adopting the industry standard SY / T5405-1996 "Acidification Corrosion Inhibitor Performance Test Method and Evaluation Index" compared with this method, the following conclusions are drawn from the measurement of the diameter of the circle: the diameter of the circle is less than 1.50cm, indicating that the corrosion rate of the acid solution is less than 1g / (m 2 • h), the acid corrosion inhibition performance is better, the diameter of the circle is between 1.5 ~ 1.8cm, indicating that the acid corrosion rate is 1 ~ 2g / (m 2 • Between h), the corrosion inhibition of the acid solution meets the standard; the diameter of the circle is greater than 1.8cm, indicating that the corrosio...

Embodiment 3

[0039] On the basis of Example 1, further, the detection solution is a mixed solution prepared from copper sulfate and a stabilizer according to the ratio of mass ratio (2.0-2.2): (0.5-0.6), and the copper sulfate is analyzed Pure, the stabilizer is a lead salt stabilizer, specifically one of dibasic lead stearate, dibasic lead stearate or dibasic lead phthalate, used to maintain chemical balance and increase solution Stability, preferably dibasic lead stearate.

[0040] Further, the detection bottle is a corrosion-resistant plastic bottle with a volume of 60 mL and a diameter of 5 cm.

[0041] Further, the test box is a white round plastic box with a diameter of 3 cm and a height of 2 cm.

[0042] Further, the test piece is made of zinc powder, iron powder, adhesive, metal chelating agent and plastic paper, and its specific manufacturing steps are as follows:

[0043] First pass a certain amount of zinc powder and iron powder through a 400-mesh sieve, and then pass the siev...

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Abstract

The invention provides a method for measuring the corrosion inhibition performance of acid liquid in an oil field, which comprises the following steps: S1 drops a certain amount of acid liquid to be tested into a detection bottle equipped with a detection liquid, shakes it well, and obtains a mixed liquid; S2 tests Pierce the middle part of the test piece in the box; S3 pipette 10-11 mL of the mixed solution obtained in step S1 and add it into the test box, so that the test piece is completely submerged and wet; S4 After waiting for 3 to 5 minutes, take out the test piece and test A light-colored circle appears along the punctured center of the slice, and the diameter of the circle is measured with a ruler; S5 judges whether the corrosion performance of the acid solution for oil field acidification meets the standard according to the diameter of the measured circle. The invention can quickly detect the rate of corrosion of the steel sheet by the chelating acid, has simple detection steps, facilitates the monitoring of the quality of the acid liquid during on-site construction, reduces the corrosion of oil pipes by the unqualified acid liquid, thereby reducing the production cost of the oil field.

Description

technical field [0001] The invention belongs to the technical field of oil field injection water development, relates to oil field acidification enhancement injection, and in particular to a method for measuring the corrosion inhibition performance of acid liquid in an oil field. Background technique [0002] During the water injection process in the oilfield, affected by the incompatibility of the formation water and the injection water, the formation gradually scales, the water injection pressure rises, and the water injection well gradually appears under-injection. In response to this phenomenon, the oil field usually takes measures to increase injection. At present, the commonly used methods of increasing injection in oil fields are acidizing, acid fracturing, fracturing, etc., and acidizing is the main method. Every year, the acidizing workload of water injection wells in Changqing Oilfield is heavy, and the amount of acid is large. The casing of the water injection stri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/00G01N17/00
CPCG01N17/006G01N33/00
Inventor 邓志颖王勇陆小兵宋昭杰王尔珍何汝贤王晓娥胡改星王子建
Owner PETROCHINA CO LTD
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