Corrosion-inhibiting bactericide for shale gas field

A bactericide and corrosion inhibition technology, applied in biocides, applications, disinfectants, etc., can solve problems such as electrochemical corrosion and bacterial corrosion, and achieve low dosage, good corrosion inhibition effect, and good bactericidal effect

Active Publication Date: 2018-10-12
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of bacterial corrosion and electrochemical corrosion in the low-cost development process of shale gas fields, the object of the present invention is to provide a kind of antibacterial agent for sterilization and corrosion control of gathering and transportation pipelines or produced water in shale gas fields

Method used

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  • Corrosion-inhibiting bactericide for shale gas field
  • Corrosion-inhibiting bactericide for shale gas field
  • Corrosion-inhibiting bactericide for shale gas field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] In parts by weight, the shale gas field corrosion inhibitor bactericide of the present embodiment comprises:

[0022]

[0023] Wherein, the alkyl allyl quaternary ammonium salt in the amido oligomer is dodecyl dimethyl allyl ammonium chloride, the molecular weight of the amido oligomer is 1210, and the aldehyde is glutaraldehyde.

experiment example 1

[0025] Produced water samples from a shale gas field in Sichuan, prepared the corresponding culture medium according to "Standards for Bacterial Analysis of Oil and Gas Field Injection Water by Extinction Dilution Method" SY / T 0532-2012, and counted and measured the sulfate reduction in the water sample by using the extinction dilution method Bacteria is 4.5×10 3 Individual / mL, saprophytic bacteria: 1.5×10 3 Individual / mL, iron bacteria is 1.1×10 3 cells / mL, the total number of bacteria is 7.1×10 3 individual / mL.

[0026] Using the corrosion-inhibiting bactericide of Example 1, respectively inject the bactericide into the water samples at room temperature, and sterilize for 4 hours. The sterilized water sample and the blank sample were injected into the test bottle, and left at room temperature for 7 days to test the number of bacteria in the water sample. The bacterial test results are shown in Table 1:

[0027] The bactericidal effect of table 1 different concentrations...

experiment example 2

[0031] Use the corrosion inhibitor bactericide of embodiment 1, concentration is 80mg / L, adopts 20# steel sample to carry out the corrosion test under normal temperature, and test water is the shale gas field produced water of experimental example 1, and the result is as shown in table 2:

[0032] The corrosion inhibition effect of corrosion inhibitor bactericide in the embodiment 1 of table 2

[0033]

[0034] Use the corrosion inhibitor bactericide of embodiment 1, concentration 80mg / L, test water is the shale gas field produced water of experimental example 1, and bactericidal effect is as shown in table 3:

[0035] The bactericidal effect of corrosion inhibitor bactericide in the embodiment 1 of table 3

[0036]

[0037]

[0038] The experimental results in Table 2 and Table 3 show that the corrosion inhibitor bactericide of the present invention has good corrosion inhibition and bactericidal effects on shale gas produced water.

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Abstract

The invention discloses a corrosion-inhibiting bactericide for a shale gas field. The corrosion-inhibiting bactericide for the shale gas field is prepared from the following components in parts by weight: 2 to 16 parts of amido oligomer, 15 to 30 parts of aldehyde, 15 to 30 parts of tetrakis hydroxymethyl phosphonium sulfate, 2 to 5 parts of alkylphenol polyoxyethylene OP-10 and 40 to 63 parts ofwater, wherein the amido oligomer is copolymerized by acrylamide, sodium acrylate and alkyl allyl quaternary ammonium salt. Compared with the prior art, the corrosion-inhibiting bactericide has the characteristics that the lasting period is long, the usage amount is small, and the corrosion-inhibiting sterilizing effect is good; the corrosion-inhibiting bactericide can be used for the corrosion inhibiting and sterilizing of gas collecting pipelines and water pipelines for shale gas collection, and sterilizing and corrosion inhibiting of pressure test water and production water of oil gas fieldpipelines; the strong killing effect on anaerobic bacteria and oxygen bacteria is realized.

Description

technical field [0001] The invention belongs to the technical field of oil and gas gathering and transportation in shale gas fields, and more specifically relates to a corrosion inhibitor and fungicide for shale gas fields. Background technique [0002] During the development of shale gas fields, the surface injection of water, drilling fluid, fracturing fluid, etc. will bring bacteria into the production system. Judging from the production of shale gas at home and abroad, most shale gas fields will produce 1- Bacterial corrosion broke out after 2 years, and the pipeline began to corrode and perforate after 1.5 years of production and failed. [0003] In the face of severe bacterial corrosion in shale gas fields, it is necessary to inject fungicides for a long time to kill bacteria. At the same time, the output fluid of shale gas fields contains residual acid, CO 2 Corrosive media such as corrosive media are highly corrosive to downhole pipe strings and surface gathering a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/54A01N57/20A01N35/02A01P1/00
CPCA01N35/02A01N57/20C09K8/54C09K2208/32
Inventor 李林辉张仁勇施岱艳张金钟崔磊杜磊蒲远洋
Owner BC P INC CHINA NAT PETROLEUM CORP
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