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Corrosion inhibitor intensifier and method of using the same

a corrosion inhibitor and intensifier technology, applied in the field of aqueous acid composition, can solve the problems of high cost of corrosion inhibitors, affecting the effect of corrosion inhibitors, and affecting the effect of corrosion inhibitors, and achieve the effect of reducing the corrosive effect of acidic solutions

Inactive Publication Date: 2006-11-23
BAKER HUGHES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009] An acid composition, suitable for use in acidizing a subterranean formation or wellbore, contains, in addition to an aqueous organic acid solution and corrosion inhibitor, a corrosion inhibitor intensifier. The corrosion inhibitor intensifier contains a terpene. Such compositions substantially reduce the corrosive effects of the acidic solution on metals in contact with the acidic solution.

Problems solved by technology

In some instances, such as in stimulation processes requiring strong acids, high temperatures, long duration jobs and / or special alloys, the cost of corrosion inhibitors may be so high that it becomes a significant portion of total costs.
However, synergistic effects are typically only evident when the corrosion inhibitor intensifier is used at relatively high concentrations.
Corrosion inhibitor intensifiers further are often incompatible with certain corrosion inhibitors.
Thus, the ability to formulate compositions at their requisite concentration levels is often compromised.
Weak organic acids, like formic acid, have limited application since their low pH makes them more difficult to handle.
Further, such acids are only useful at high concentrations.
Further, formic acid has limited applicability because it is only useful as an inhibitor intensifier in mineral acid, such as HCl systems.
The use of salts, such as salts of arsenic and mercury, as inhibitor intensifiers has further been unsuccessful in light of their toxicity.
Further, salts are not typically cost effective since they must be used at high concentrations and coupled with a chelating agent in order to avoid precipitation upon transformation into liquids.
Such salts, when used in conjunction with HF-containing acid systems in sandstone acidizing, must be used at such high concentrations that unacceptable levels of precipitation occur.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

examples

[0029] The following examples will illustrate the practice of the present invention in its preferred embodiments. Other embodiments within the scope of the claims herein will be apparent to one skilled in the art from consideration of the specification and practice of the invention as disclosed herein. It is intended that the specification, together with the example, be considered exemplary only, with the scope and spirit of the invention being indicated by the claims which follow.

[0030] In the Examples, the following abbreviations are employed:

[0031] CI-11 is a corrosion inhibitor containing alkylpyridinium quaternary, thiourea and oxyalkylated alkylphenols in isopropanol and water, commercially available from BJ Services Company.

[0032] CI-25 is a corrosion inhibitor containing a blend of quaternary salts, alcohols, formamide and ethoxylated nonylphenol, commercially available from BJ Services Company.

[0033] CI-14 and CI-30 are corrosion inhibitors, commercially available from ...

examples 1-92

[0038] Corrosion inhibitor formulations were prepared containing a corrosion inhibitor, a terpene and an acid solution, as set forth in Table I. Metal coupons where then soaked in these acids formulations at various temperatures. Corrosion was measured for a number of hours as indicated in the tables. Based on the weight loss of metal coupon, the corrosion rate was calculated by the following formula:

Corrosion Rate=[Initial Metal Mass (gram)]−[Final metal mass (gram)] / [Metal area (square centimeter)]

[0039] The results are compiled in Table I.

TABLE ITestExampleCorrosionInhibitorInhibitor,Intensifier,Acid Type,Times,MetalCorrosionNo.InhibitorIntensifierGPTGPTAmountTemp., ° F.HoursTypeRateComp. Ex.CI-11None4015% HCl18016N-800.0193 1 2CI-11Alpha Terpene2215% HCl20016N-800.0335Comp. ExCI-14None4015% HCl18016N-800.0195 3 4CI-14Alpha Terpene2215% HCl18016N-800.0115Comp. Ex.CI-14Antimony Salt2215% HCl18016N-800.1572 5 6CI-14Alpha Terpene2215% HCl20016N-800.0449 7CI-14D'Limonene2215% HCl2...

examples 93-96

[0040] Corrosion inhibitor formulations were prepared containing Antecor OG as corrosion inhibitor, a terpene and an acid solution of 2% HF, 13% acetic acid and 9% formic acid. A QT-900 coil tubing metal coupon was soaked in the acid solutions at 329° F. (165° C.) at 3500 psi under agitation for 8 hours. The results are compiled in Table II.

TABLE IICorrosionExampleInhibitor,Rate,PittingNo.GPTIntensifier @GPTlbs / ft2Number9320Alpha Terpene @ 250.0109Tr.9415Alpha Terpene @ 250.013519510Alpha Terpene @ 250.0162Tr.9620None0.0613Tr.

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Abstract

An aqueous organic acid composition containing a terpene as corrosion inhibitor intensifier is especially suitable for use in acidizing subterranean formations and wellbores. The composition substantially reduces the corrosive effects of the acidic solution on metals in contact with the acidic solution. Suitable terpenes include carotene, limonene, pinene, farnesene, camphor, cymene and menthol.

Description

FIELD OF THE INVENTION [0001] The present invention relates to an aqueous acid composition containing a terpene and methods of using the composition to inhibit or reduce the corrosion of metals. BACKGROUND OF THE INVENTION [0002] Some well stimulation techniques, such as pickling, acid washing, matrix acidizing and acid fracturing, require the use of corrosion inhibitors to reduce the rate of acid attack on metal components and to protect wellbore tubular goods. In some instances, such as in stimulation processes requiring strong acids, high temperatures, long duration jobs and / or special alloys, the cost of corrosion inhibitors may be so high that it becomes a significant portion of total costs. In such scenarios, corrosion inhibitor intensifiers, also known as corrosion inhibitor aids and corrosion inhibitor boosters, are included in the formulation in order to reduce costs and ensure that the stimulation job can be performed cost effectively while complying with technical require...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C23F11/14
CPCC09K8/52C09K8/74C23F11/122C23F11/10C09K2208/32C23F11/04
Inventor PENNA, ADAUTOARIAS, GINO F. DI LULLORAE, PHILIP JAMES
Owner BAKER HUGHES INC
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