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Multiple-effect solid inhibiting anti-scale rod

A technology of corrosion and scale inhibition and corrosion and scale inhibitors, which is applied in wellbore/well components, earthwork drilling and production, etc., which can solve the problems of shortened equipment life, high flow rate, and liquid corrosion inhibitors are easily taken out quickly.

Inactive Publication Date: 2008-03-12
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the process of oil and gas exploitation, due to the joint effect of high flow rate and various corrosive media, the casing, tubing and surface pipelines are subjected to extremely severe corrosion and abrasion, which shortens the life of the equipment, affects the production of oil wells, and causes huge economic losses.
[0003] For a long time, oil fields have generally adopted the method of intermittently injecting liquid corrosion inhibitors for corrosion protection. The following problems have been encountered: ① Oil and gas wells have large fluid production and high flow rates, and the added liquid corrosion inhibitors are easily taken out quickly, and the effective protection period of corrosion inhibitors Short; ②The liquid corrosion inhibitor added from the oil casing annulus is difficult to reach the well section below the working valve, and 30%-50% of the pipe string cannot be protected; Ground equipment measures such as containers and pump trucks are difficult to manage
In addition, the dosage is uneven, the consumption of chemicals is large, the workload of dosing is large, the dosage of chemicals is not easy to control, and the effect is unstable; ④ For wells with packers, the well section below the packers cannot be protected; ⑤ For remote wells, Inconvenient to use

Method used

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  • Multiple-effect solid inhibiting anti-scale rod
  • Multiple-effect solid inhibiting anti-scale rod
  • Multiple-effect solid inhibiting anti-scale rod

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The multi-effect perimeter antiscaling rod components are composed of the following components in weight percent: polyvinyl alcohol 8%; polymaleic anhydride and hydroxyethylene diphosphonic acid 15%; zinc chloride 30%; epoxy resin 10%; Alkyl dimethyl benzyl ammonium chloride 2%; water 35%.

[0024] The preparation process of the composition of the present invention is as follows: according to the formula of the above-mentioned composition weight percentage, mix the 1:1 mixture of raw material polymaleic anhydride and hydroxyethylene diphosphonic acid with zinc chloride, add the above-mentioned formula Water in percentage by weight, then slowly add polyvinyl alcohol, stir, and knead in a kneader for 5 hours at 80°C. During the kneading process, add 1% of the catalyst ammonium persulfate in the total amount of the above composition. When the kneaded mixture is close to dryness, add Dodecyl dimethyl benzyl ammonium chloride, the reactant is quickly dried and crushed, and e...

example 1

[0025] The linear polarization corrosion rate and pitting coefficient of the corrosion and scale inhibition rod described in Example 1 were continuously monitored for 10 days as shown in FIG. 1 .

[0026] It can be seen from the test results that with the prolongation of the monitoring time, the linear polarization corrosion rate sum (LPR) and the pitting coefficient (PF) gradually decrease and tend to be stable, showing good corrosion inhibition performance. The scale inhibition rate reaches 79%.

[0027] Through continuous monitoring for 10 days, it can be seen that the change trend of linear polarization corrosion rate (LPR) is shown in Figure 1.

[0028] It can be seen from Figure 1 that: with the extension of time and the continuous release of active ingredients, the linear corrosion rate (LPR) is controlled below the standard of less than 0.076mm / y. The pitting coefficient (PF) is within the safe limit (less than 0.1)

[0029] The field test of four wells has been carr...

Embodiment 2

[0032] The multi-effect solid antiscaling rod component is composed of the following components in weight percentage: polyacrylamide 10%; polymaleic anhydride and hydroxyethylene diphosphonic acid 20%; zinc oxide 35%; calcium stearate 10%; Dialkyl dimethyl benzyl ammonium chloride 5%; water 20%.

[0033] The preparation process and parameters of this example are the same as those in Example 1, and the difference compared with Example 1 is that in the preparation process, polyacrylamide is used as the polymer forming agent instead of polyvinyl alcohol, and zinc oxide is used as the synergist instead of zinc chloride. Binding agent has replaced epoxy resin with calcium stearate, and present embodiment technological process and process parameter are as follows:

[0034] Prepared according to the weight percent formula of the above composition, mix the 1:1 mixture of raw material polymaleic anhydride and hydroxyethylene diphosphonic acid with zinc oxide evenly, add the water of th...

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Abstract

The invention relates to an anti-corrosion product, in particular to a multi-functional solid inhibiting anti-sludging bar that releases slowly, which is characterized in that, the anti-sludging bar comprises by weight macro-molecule forming aent 8-10%, inhibiting anti-sludging agent 15-20%, synergist 30-35%, binder 10%, surface active agent 2-6%, and water 20-35%. The invention is furnished with such functions as inhibiting, resisting wax and anti sludging, the protection range of the pipe column is wide, the cost is low, and the effect is steady. The invention is of such effect as slow releasing, inhibiting, anti sludging and resisting wax, and is easy to dose on site.

Description

technical field [0001] The invention relates to an anti-corrosion product, in particular to a slow-release multi-effect solid corrosion and scale inhibition rod. Background technique [0002] In the process of oil and gas exploitation, due to the combined effects of high flow rate and various corrosive media, the casing, tubing and surface pipelines are subjected to extremely severe corrosion and abrasion, which shortens the life of the equipment, affects the production of oil wells, and causes huge economic losses. [0003] For a long time, oil fields have generally adopted the method of intermittently injecting liquid corrosion inhibitors for corrosion protection. The following problems have been encountered: ① Oil and gas wells have large fluid production and high flow rates, and the added liquid corrosion inhibitors are easily taken out quickly, and the effective protection period of corrosion inhibitors Short; ②The liquid corrosion inhibitor added from the oil casing an...

Claims

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Application Information

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IPC IPC(8): C23F11/08C09K8/54
Inventor 尹敬军刘立郭亮
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD