Injection Water Treatment at the Source: Biocide-Enhanced Corrosion Inhibitor Squeeze Treatments of Water Supply Wells in a Central Arabia Oilfield

Rosser, H.R.; Nasr‐El‐Din, Hisham A.; Al-Shammari, N.A.; Al-Dhafeeri, Abdullah M.

doi:10.2118/50740-ms

Cited by 2 publications

(1 citation statement)

References 16 publications

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“…Produced water from oil wells contains droplet of oils, suspended particles, and chemical additives. [1][2][3][4][5][6][7][8]19 The added chemicals may include anti-sludge, biocides, scale and corrosion inhibtors. 12,17 These chemicals can adversely affect the injectivity performance if not optimized.…”

Section: Introductionmentioning

confidence: 99%

Lessons Learned from Using New Chemical Recipe for Acid Stimulation in Water Disposal Wells (Al-Khafji Field)

2012

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Acid treatments for dolomite formation with low permeability differ from that applied for calcite rock. Unlike limestone acidizing where HCl reacts with limestone in rapid reaction rate to generate reaction products soluble in water. In Some cases, injectivity well can not effectively improve in dolomite formation with low permeability using conventional 15 wt% HCl acid. In addition, formation damage due to drilling or workover operations can not be removed. Therefore, the process of treating dolomite for injectivitiy improvement may consider a serious issue for acid stimulation. The challenges of dolomite acidizing are to optimize damage removal while maximizing rock permeability with wormhole occurrences. Well DW-4 drilled and completed as horizontal open hole wastewater disposal wells for excess water production from offshore oil wells in Al-Khafji Field. This well is used to dispose the un-wanted co-produced water which shows injectivity decline with time due to sand plugging and oil content droplet.Several acid stimulation treatments were conducted on subject well with low rate of success due to not considering the dolomite reaction rate and the chemical volume to be used. A simple previous treatment review was conducted to select the best chemical recipe and treatment volume for injectivity improvement . As a result of conducting new chemicals recipe with optimum treatment volume, a major improvement in well injectivity with formation damage removal was obtained. This paper demonstrated new design methodology with extensive field study to address the challenges and the best future operation practices for acid stimulation. It included a pre-flush of mutual solvents, then bullheading stage of 20 wt% HCl with intensifier to accelerate the chemical reaction with dolomite rock.A carefully designed train of treatment fluids was applied to remove formation damage induced by drilling and injection fluids. Injectivity tests before and after each step of the treatment was recorded and evaluated. Proper design and execution of the stimulation treatment almost doubled the well injectivity index. Challenges, fluid selection, design criteria, field treatment, lessons learned, and results of the acid treatments were discussed in this paper.

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Section: Introductionmentioning

confidence: 99%

Lessons Learned from Using New Chemical Recipe for Acid Stimulation in Water Disposal Wells (Al-Khafji Field)

2012

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A Novel Two-Stage Treatment to Remove Scales from Oil Producing Wells in a Sandstone Reservoir

Alfakher

Al-Taq

Alrustum

et al. 2017

Day 2 Tue, April 25, 2017

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Several oil producer wells in a sandstone reservoir have experienced productivity decline due to obstruction material. Bailer samples were collected at different depths to identify the nature of the obstruction material and recommend an optimized remedial treatment to restore productivity of damaged wells. The samples were found to be heterogeneous and contained different types of scales including calcite and iron containing compounds. Various forms of iron sulfides, iron hydroxides were present in the collected samples at different concentrations. Sand, elemental sulfur and trace amounts of iron oxides were also present in some of the samples. Mechanisms of scales formation were investigated in this study to recommend prevention measures. As an example, greigite (Fe3S4), present as one of the major scales (49 wt. %) in one of the samples, may form due to the reaction of iron sulfide (FeS) with excess sulfur, both detected in the sample. Formation of iron sulfide was attributed to SRB's which dictates the need to have effective biocide treatments. Solubility tests of collected scales in different dissolver systems were examined as a function of temperature and soaking time. Among other examined dissolver systems, (HCl) acid was found to be the most effective. Effects of acid additives on the solubility of scales were examined in order to optimize the acid recipe. The formation of interest is sandstone containing up to 2 wt. % authigenic clays. The use of HCl acid may induce fines migration and sanding problems. Based on lab results, a novel two-stage remedial treatment is recommended to restore productivity of damaged wells. The first stage involves treating the wellbore with HCl acid including the required additives to remove the scaling material from the wellbore area. The second stage includes incorporating organic acid to stimulate the formation matrix. This paper presents a study detailing the design of a novel two-stage treatment able to remove scales and overcome some of the anticipated challenges in stimulation of sandstone formations. The paper also addresses results of extensive lab work conducted to optimize the treatment recipes.

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Injection Water Treatment at the Source: Biocide-Enhanced Corrosion Inhibitor Squeeze Treatments of Water Supply Wells in a Central Arabia Oilfield

Abstract: This paper was prepared for presentation at the 1999 SPE International Symposium on Oilfield Chemistry held in Houston, Texas, 16-19 February 1999.

Cited by 2 publications

References 16 publications

Lessons Learned from Using New Chemical Recipe for Acid Stimulation in Water Disposal Wells (Al-Khafji Field)

Lessons Learned from Using New Chemical Recipe for Acid Stimulation in Water Disposal Wells (Al-Khafji Field)

A Novel Two-Stage Treatment to Remove Scales from Oil Producing Wells in a Sandstone Reservoir

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