Evaluation and Treatment of Organic and Inorganic Deposition in the Midway Sunset Field, Kern County, California

An increasing incidence of amorphous deposits in both production and water injection systems is causing considerable problems for offshore fields. The amorphous deposits are typically comprised of both organic (biological or hydrocarbon) and inorganic material and can differ considerably in composition. System deposits of this nature have been previously characterised as ‘Schmoo’ and within our company the descriptive, but non-specific term ‘Black Sticky Stuff’ has been coined. The challenge with use of this terminology is that it makes accurate description of deposits from different systems difficult and does not allow similar materials to be easily categorised. This paper describes the work undertaken to better understand the composition of samples taken from different systems, both production and injection. Systematic analysis has led to the development of a classification matrix for deposits related to their major components. From the classification, improved knowledge has been gained to enable increased consistency of removal or preventive methods. Some initial observations are made on an unusual form of deposit - being either a product of, or promoting corrosion - being encountered in water injection systems. The material is causing concern with regard to system integrity and intervention in injection wells. Work to define the root cause, and develop removal methods of this type of deposit is presented.

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Investigation, Classification and Remediation of Amorphous Deposits in Oilfield Systems

Eroini

Anfindsen

Mitchell

2015

SPE International Symposium on Oilfield Chemistry

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A New Technique for the Evaluation of Acid Additive Packages

Houchin¹,

Foxenburg²,

Usie³

et al. 1992

SPE Formation Damage Control Symposium

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The expanded use of sandstone matrix acidizing techniques may have been the most significant trend of the turbulent 1980's. Gulf Coast operators have found that remedial acid treatments cost a fraction of that required for a comparable offshore completion. Improved design and application techniques now provide economic success rates greater than 80% with most treatments paying out in less than 30 days. However, one area that continues to frustrate designers of acid treatments is the unpredictability of crude oil reservoirs. Current testing procedures are inadequate, failing to accurately replicate the interaction between the treating fluid and acid sensitive crudes. Reliance on these procedures can produce catastrophic facility upsets, downhole emulsion blocks, reduced damage removal efficiency or result in a marginal treatment response. A new simplified laboratory testing procedure was developed which more accurately simulates treatment effects under reservoir conditions. This laboratory test demonstrates the need for less reliance on surfactant non-emulsifiers and an expanded use of mutual solvents. Field data confirms more accurate prediction of add compatibility. In addition, acid treatments designed utilizing this laboratory procedure showed greater initial production response and maintained the incremental increase for a much longer time. Design guidelines are presented which address concerns of mutual solvent/corrosion inhibitor incompatibility, high temperature applications and treating volume requirements.

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A Unique Method of Evaluating Stimulation Effectiveness in Production Damaged Slotted Liners

Wood¹,

McKeon

1995

SPE Western Regional Meeting

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bht 1995, society of PetroleumEngineer%Inc. Thle paper wee preparedfur preeentetiin at the Weetern RegioneiMeeting held in Bakersfield,CA, U.S.A., B-10 March 19S5. This peper wee eeboted for preaentetii by an SPE ProgramCommitteefollowingreviewof information oonteinedin an ebetreotsubmittedby the author(s). C0ntent8of the Paper, ee preeented,hew not been reviewedby the Sooiatyof PetroleumEnglneereand areeubjeotto correctionby the author(s). The materiel,ae preeented,doee not neoeeeerltyrefbtt any poeitbnof the Sooietyof Petrmleum i%gineere,iteoiikere, c+ merniim.~@WS~~t X s~~~I~W~r :~ti~:~P' M!C+!OR~~h. Frl&!Q! @rnm!tteee cd !hQ SOOiety of PetroleumEngiwre. Perr&esbntoCOPY ie reetrbtedtoan dwtreotcdnotmorethenS00wrote. Iiluetratbnemaynotbe oopbd.The ebetreol shouldcontelnoonepkuoue eoknowiadgment ..-, -of where and by whomthe paper is preeented.Write Librarian,SPE, P.O. Box SSSSSS, Rbherdeon,TX 750S$SBW, U.S.A., Telex 1SS245SPEUT. ABBTRAC TAfter years of service in steamflood and cyclically steamed reservoirs, slotted liners tend to become clogged with migrating formation material and heavy asphaltene deposits'.These deposits seriously restrict inflow and typically make the wells economically unproductive. Acid wash jobs performed through coiled tubing jet wash tools have been found to be extremely effective as a damage removal technique. This paper describes development, testing and preliminary findings of a test vessel which can mechanically isolate small sections of damaged slotted liners and evaluate the effectiveness of different stimulation scenarios.

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Evaluation and Treatment of Organic and Inorganic Deposition in the Midway Sunset Field, Kern County, California

Cited by 4 publications

References 2 publications

Investigation, Classification and Remediation of Amorphous Deposits in Oilfield Systems

Investigation, Classification and Remediation of Amorphous Deposits in Oilfield Systems

A New Technique for the Evaluation of Acid Additive Packages

A Unique Method of Evaluating Stimulation Effectiveness in Production Damaged Slotted Liners

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