Unlock instant, AI-driven research and patent intelligence for your innovation.

Coalbed methane shaft combined corrosion inhibitor and application thereof

A technology for coalbed methane wells and corrosion inhibitors, which is applied to drilling compositions, wellbore/well components, earthwork drilling and production, etc., can solve the problems of not being able to receive effective protection from corrosion inhibitors, and achieve excellent corrosion inhibition effects, The preparation method is easy and the adsorption performance is good

Inactive Publication Date: 2019-12-27
SOUTHWEST PETROLEUM UNIV +2
View PDF5 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The inner wall of the oil pipe and the friction part of the sucker rod cannot be effectively protected by the corrosion inhibitor

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Coalbed methane shaft combined corrosion inhibitor and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Prepare 100kg of a coalbed gas wellbore combined corrosion inhibitor, which consists of the following raw materials in parts by weight: first add 10kg of fatty alcohol polyoxyethylene ether sodium sulfate and 6kg of ethanol to a container with 71.5kg of water, then add 7.5kg of bis Oleyl amidoethyl imidazoline and 5kg of heptadecenylamine ethyl imidazoline quaternary ammonium salt were mixed evenly to obtain a light black liquid.

[0027] Referring to "SY / T 5273-2014 Performance Index and Evaluation Method of Corrosion Inhibitors for Oilfield Produced Water Treatment", according to 500mg / L dosing, the measured corrosion rate of carbon steel coupons is 0.0430mm / a, and the corrosion inhibition rate is 96.75 %.

Embodiment 2

[0029] Prepare 100kg of a coalbed gas wellbore combination corrosion inhibitor, which is composed of the following raw materials in parts by weight: first, 15kg of fatty alcohol polyoxyethylene ether sodium sulfate and 10kg of ethanol are added to a container with 50kg of water In, then add 20kg of bis-oleyl amidoethyl imidazoline, 5kg of oleic acid imidazoline quaternary ammonium salt, stir and mix evenly to obtain a light black liquid.

[0030] Referring to "SY / T 5273-2014 Performance Index and Evaluation Method of Corrosion Inhibitors for Oilfield Produced Water Treatment", according to 400mg / L dosing, the measured corrosion rate of carbon steel coupons is 0.0426mm / a, and the corrosion inhibition rate is 96.75 %.

Embodiment 3

[0032] Prepare 100kg of a coalbed gas wellbore combination corrosion inhibitor, which is composed of the following raw materials in parts by weight: first, 20kg of fatty alcohol polyoxyethylene ether sodium sulfate and 10kg of ethanol are added to a container with 40kg of water In, then add 10kg benzamide-ethyl-oleic acid imidazoline, 20kg lauric acid imidazoline quaternary ammonium salt, stir and mix to obtain light black liquid.

[0033] Referring to "SY / T 5273-2014 Oilfield Produced Water Treatment Corrosion Inhibitor Performance Index and Evaluation Method", according to 300mg / L dosing, the measured corrosion rate of carbon steel coupons is 0.0413mm / a, and the corrosion inhibition rate is 96.88 %.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
corrosion rateaaaaaaaaaa
corrosion rateaaaaaaaaaa
corrosion rateaaaaaaaaaa
Login to View More

Abstract

The invention relates to the technical field of oil and natural gas anticorrosion treatment, in particular to a coalbed methane shaft combined corrosion inhibitor and application of the coalbed methane shaft combined corrosion inhibitor. The coalbed methane shaft combined corrosion inhibitor comprises, by weight, 5-30 parts of quaternary ammonium salts, 7.5-25 parts of imidazoline derivatives, 6-20 parts of alcohols and 10-25 parts of fatty alcohol polyoxyethylene ether sodium sulfate. The combined corrosion inhibitor is a corrosion inhibitor with an excellent corrosion inhibition effect suitable for chloride ion corrosion, the effective action concentration is low, the corrosion inhibition rate of an N80 steel sheet can reach 96.98% or even higher when the dosage is 300 mg / L, and the combined corrosion inhibitor is quite suitable for the field of coalbed methane exploitation with strict cost control.

Description

technical field [0001] The invention relates to the technical field of oil and natural gas anticorrosion treatment, in particular to a coalbed gas wellbore combination corrosion inhibitor and its application. Background technique [0002] Wellbore corrosion has always been one of the three main problems in the wellbore in coalbed methane exploitation (the other two problems include wellbore scaling and wellbore eccentric wear). The corrosion of the wellbore seriously affects the drainage continuity of the coalbed methane well, affects the normal production of the coalbed methane well, causes expensive workover costs, and even leads to the scrapping of the oil and gas well. Because the production of coalbed methane wells is generally lower than that of conventional gas wells, a cost-effective anti-corrosion technology is required. [0003] Corrosion inhibitors have the characteristics of low cost, simple technical use, no major modifications to the gas production system, and...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/173C09K8/54
CPCC09K8/54C23F11/173
Inventor 蒋建勋王凤林李静刘其虎程福平樊洪波肖东冯堃宋东斌鹿倩
Owner SOUTHWEST PETROLEUM UNIV