Foamed Diversion in the Chase Series of Hugoton Field in the Mid-Continent

Logan, E.D.; Bjornen, Kevin; Sarver, David R.

doi:10.2523/37432-ms

Cited by 3 publications

(1 citation statement)

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“…Foams (e.g., with nitrogen gas) [Logan et al, 1997;Zerhboub et al, 1994] have been used particularly in cases where other diversion techniques are impractical or less efficient. Foams have the additional advantage of good cleanup with little or no potential for damage to the formation.…”

Section: Zonal Isolation and Height Diversion Challenges -Open Hole Wmentioning

confidence: 99%

Evaluation of Oil-Industry Stimulation Practices for Engineered Geothermal Systems

Dyke¹,

Weijers²,

Robertson-Tait³

et al. 2007

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Section: Zonal Isolation and Height Diversion Challenges -Open Hole Wmentioning

confidence: 99%

Evaluation of Oil-Industry Stimulation Practices for Engineered Geothermal Systems

Dyke¹,

Weijers²,

Robertson-Tait³

et al. 2007

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Field Cases to Demonstrate Application of through Tubing Inflatable Anchoring Packer to Selectively Stimulate Vertical Dump Water Injector Wells with Cross Flowing Zones

Al-Dubais¹,

Kharari

Jemmali

et al. 2004

SPE Asia Pacific Oil and Gas Conference and Exhibition

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There are few methods to acid stimulate cross-flowing zones in dump water injector wells. Traditionally these wells are stimulated by bull-heading acid from surface or pumping it through Coiled Tubing (CT). The dilution and contamination of the acid while being injected into the formation resulted in no increase in dumping injection rates. Poor post stimulation results are confirmed by spinner survey logs done before and after the conventional acid treatments. Through Tubing Inflatable Anchoring Packer (TTIAP), a new zonal isolation tool conveyed by coiled tubing was successfully used to selectively acidize the targeted zone by isolating the non-desired zones. TTIAP has an effective and reliable high pressure sealing properties at large inflation ratio. Its chemical resistance makes it ideal for selective placement of treating fluids, such as acid stimulation and water shut off fluids.1,2 A non-polymeric Viscoelastic Surfactant based Self Diverting Acid (VES-SDA) system was successfully used to divert and effectively stimulate these vertical dump water injector wells by achieving uniform acid coverage across the whole perforated interval. The VES-SDA is a single stage fluid that has the capability to stimulate and divert in one step. This paper discusses the successful application of TTIAP as a mean of mechanical diversion in the well-bore area to isolate between the "S" aquifer and the "R" reservoir, while VES-SDA acid was used as a mean of chemical diversion inside carbonate formations. The injection evaluation logs showed significant injection rate increase after the new stimulation method. This study marks the first time such a combination was used to stimulate dump water injector wells with crossflowing zones in Saudi Arabia. Field History The limestone reservoir "R" was discovered in 1963. The crude oil production was commenced in November 1966. This reservoir produces 32 degree API gravity oil. The subsea depths of oil producing zones are ranging from 6,900 ft to 7,300 ft. The full-scale oil production from this reservoir was commenced in the middle of 1969 with a reservoir BHP of 3,610 psi. Along with the oil production, the reservoir pressure declined rapidly. By 1975 the reservoir pressure declined to about 2,660 psig. To keep producing the reservoir naturally, it was decided to use the "S" aquifer to maintain the reservoir pressure and laterally sweep the oil in place. Eleven new vertical dump water injector wells were drilled and perforated through the shallow aquifer and the depleted limestone reservoir. As a result a continuous water injection from the aquifer into the reservoir is achieved naturally. As of the end of year 2003, a total of 36 wells were completed in this reservoir, 25 wells are producers and 11 wells are injectors. The average reservoir pressure at the end of June 2003 was 2,805 psig at its datum depth of 7,260 ft subsea. Introduction Traditionally, stimulating wells with production tubing without inflatable assisting equipment meant that formations could not be stimulated selectively or could only be stimulated using less-effective diverting techniques. The ability to isolate individual intervals is imperative to the successful stimulation of a particular zone. The inflatable zonal isolation technique had to be reliable and fast in order to reduce overall treatment costs enabling quick payback.3 Previous failed inflatable attempts from incompatibility with the stimulation chemicals resulted in reducing the inherent advantages of through tubing inflatable technology.

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A Novel Technique to Acidize Horizontal Wells with Extended Reach

Nasr‐El‐Din

Al-Habib

Jemmali

et al. 2004

SPE Annual Technical Conference and Exhibition

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractDrilling horizontal wells with extended reach is intended to maximize reservoir drainage and minimize water production due to water coning. However, an inherent problem with these wells is poor acid distribution during matrix acidizing, especially in reservoirs with high permeability streaks. This paper discusses an innovative approach to treat horizontal wells with extended reach. This new technique comprises mechanical diversion in the wellbore, and chemical diversion in carbonate formations.Coiled tubing has been used for years to better distribute the acid in vertical and horizontal wells. However, application of coiled tubing in long horizontal wells is a function of wellbore diameter and length. Coiled tubing cannot reach the total depth of the well if there is large washout, or if the length of the openhole is greater than what the CT can reach. The maximum length that CT can reach depends on the length of the reel, diameter of the coil and wellbore geometry. To extend this length, we have used a hydraulic tractor to pull the coiled tubing to the total depth of the well. This will ensure better acid distribution over the wellbore. To enhance acid diversion in the formation, a visco-elastic surfactant-based acid system was employed.Wells selected are horizontal that were drilled in a carbonate reservoir in the oil fields (both land and offshore) that are present in the eastern part of Saudi Arabia. The total length of the target zone for the well "A" and well "B" is 13,543 and 20,304 ft, respectively. Typical coiled tubing (1 ¾-inch) cannot reach the total depth in these wells (CT lockup length is 10,300 ft for well "A" and 13,200 ft for well "B").A special hydraulic tractor was used to pull the coiled tubing to the total depth of these two wells. A visco-elastic surfactant based-acid system was utilized to remove formation damage induced by the drilling fluid (water-based mud) and enhance the permeability of the formation in the critical wellbore area. Corrosion inhibitor and other acid additives were carefully selected to maintain the integrity of well tubulars, coiled tubing and the tractor (metallic parts, O-rings and seals of the tractor). Before attempting the stimulation of the extended reach well, a water jetting method was adopted to remove near well bore damage resulting from the drilling mud cake and mud invasion. Production logging tests were conducted after drilling the well, after the water jetting treatment, and after the matrix stimulation. The productivity index of the well decreased after the water jetting treatment. However, the acid matrix treatment delivered through the CTtractor nearly doubled the productivity index of the treated well.

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Foamed Diversion in the Chase Series of Hugoton Field in the Mid-Continent

Cited by 3 publications

References 0 publications

Evaluation of Oil-Industry Stimulation Practices for Engineered Geothermal Systems

Evaluation of Oil-Industry Stimulation Practices for Engineered Geothermal Systems

Field Cases to Demonstrate Application of through Tubing Inflatable Anchoring Packer to Selectively Stimulate Vertical Dump Water Injector Wells with Cross Flowing Zones

A Novel Technique to Acidize Horizontal Wells with Extended Reach

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