Drill-in Fluids for Multilateral MRC Wells in Carbonate Reservoir PSD
Optimization and Best Practices Leads to High Productivity: A Case Study

Siddiqui, Mohammed Afzal Ali; Al-Ansari, Adel; Al-Afaleg, Nabeel; Al-Anazi, Hamoud; Hembling, Drew; Bataweel, Mohammed

doi:10.2523/101169-ms

Cited by 5 publications

(6 citation statements)

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“…In fact, returns over 80% of the original permeability value are considered significant according to the data from the literature (Siddiqui et al 2007a,b , Lopes and Moreno 2011, Batistel et al 2011, Lopes et al 2012. Through these tests, we can quantify residual damage, analyzing the return of permeability or the oil productivity ratio (PR), given by the ratio between the real and theorical productivity index (PR < 1 Damage).…”

Section: Conceptsmentioning

confidence: 99%

Rheological Roles on the Dynamic Behavior of Drill-in Fluid Invasion and Oil Permeability Restoration of the Damage Zone

Moreno

Silveira

2013

All Days

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The formation damage caused by drilling fluid invasion around the wellbore reduces well productivity and changes the reservoir's original characteristics. In this context, drilling fluids specifically designed to perforate pay-zone, known as reservoir drill-in fluids, have been studied to optimize the drilling process and minimize formation damage. This work aimed to evaluate the brine-polymer drill-in fluids rheological behavior, invasion profiles of fluids and formation damage in carbonate and sandstone samples. For this purpose, polymer solutions was prepared using natural (XG) or synthetic (HPAM) polymers, solid-free or including CaCO 3 as bridging agent. Rheological and statistical analyses were performed. In addition, invasion lab tests at constant pressure, followed by oil backflow, were run to represent, respectively, the processes of an overbalanced drilling and a natural clean-up. The displacement tests were performed using carbonate and sandstone samples at connate water saturation and the results were compared. Through rheological evaluation and statistic analysis, the polymer and its concentration were confirmed as the main regulators of viscoelastic characteristics and consistency index for XG formulations, while the CaCO 3 addition caused significant changes only on HPAM formulations. The data of flow dynamics on carbonate samples pointed out that the oil productivity ratio (PR) was more reduced using XG fluid than HPAM one. This behavior was attributed to the higher elastic characteristics and consistency index of the fluid with XG, which provides higher flow resistance. These results were more significant when the CaCO 3 was added to the formulation, i.e., the formation of a filter-cake led to a complete reduction of PR. Comparing the influence of the rock matrix, HPAM fluids invasion was faster for the carbonate sample than for the sandstone one, possibly owing to differences in wettability and heterogeneity as mentioned in the literature. During the clean-up process, all samples showed oil permeability or productivity ratio restoration, but at different rates and cumulative oil volume flooding.

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Section: Conceptsmentioning

confidence: 99%

Rheological Roles on the Dynamic Behavior of Drill-in Fluid Invasion and Oil Permeability Restoration of the Damage Zone

Moreno

Silveira

2013

All Days

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“…Siddiqui et al (2007) described a dramatic change in the quality of DIF during drilling due to a change in the medium particle size from 78 micron to 26 micron under the detrimental action of down hole tools, equipment, bit, fluid flow, etc. This again highlights the technical significance of BMSI parameter.…”

Section: Bmsi -Technical Significancementioning

confidence: 99%

“…Several authors (Bailey et al 1999, Gaurina Medimurec and Simson 1999, Suri and Sarma 2004, Siddiqui et al 2007, Amanullah et al 2010) highlighted the importance of mechanical properties and PSD distribution of SBMs in mitigating formation damage while drilling. Due to the lack of an API Standard or any other industry method for mechanical characterization of SBMs, Aramco developed a laboratory method defined as the 'Aramco method' to evaluate the relative strength of different SBM products.…”

Section: Introductionmentioning

confidence: 99%

BMSI – An Index Parameter for Toughness and Durability Assessment of Sized CaCO3

Amanullah

Allen

2012

SPE Oil and Gas India Conference and Exhibition

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Different index parameters are used for quick assessment of mechanical properties of rocks in civil, soil and rock mechanical applications. These index parameters provide valuable information regarding material toughness, abrasion resistance, durability, strength, etc under different forces of interactions and environmental conditions. The sized bridging materials (SBMs) used in drill-in fluid design belongs to rock family and thus any rock mechanical parameters such as UCS, tensile strength, shear strength, etc can be used for mechanical characterization of SBMs to select the best and reject the worst. However, due to granular size of the SBMs with a typical particle size of below 2000 microns, the conventional rock mechanical parameters are not applicable for assessing the toughness and durability of SBMs. Hence, an appropriate index parameter is needed to assess the toughness and durability of SBMs to select the best SBMs for superior drill-in fluid formulation. This paper describes an index parameter defined as Bridging Material Stability Index (BMSI) for quick and reliable assessment of the toughness and durability of SBMs.Empirical results indicate strong relation of the index parameter with the quality of the SBMs and thus provide a quantitative means for quality control and quality assurance of SBMs. Statistical analyses of the coefficient of variation of BMSI indicate significantly lower coefficient of variation compared to common rock mechanical parameters such as compressive strength, tensile strength and shear strength parameters.The application of the index parameter will allow selecting the best and rejecting the worst SBMs for superior drill-in fluid formulations and thus expected to play a pivotal role in reducing formation damage and enhancing well productivity.

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“…Firstly it may be the desirable fines that are used as mud additives such as bentonites, visosifiers, fluid loss additives and any other fines that are used as an inseparable part of the fluid formulation. According to Siddiqui et al (2007) an average permeability reduction of 40% or more is not uncommon in case of poorly designed and maintained drill-in fluid. Thirdly, it can be induced by the disintegration and dispersion of sized bridging material that is used in drill-in fluid formulation.…”

Section: Spe 149103mentioning

confidence: 99%

“…Siddiqui et al (2007) described a dramatic change in the quality of DIF during drilling due to a change in the medium particle size from 78 micron to 26 micron under the detrimental action of down hole equipment, bit, fluid flow, etc. Hence, the DIF creates a bad quality mudcake on the borehole wall due to improper packing of the material during the deposition of the mudcake.…”

Section: Production Engineering Significancementioning

confidence: 99%

The Aramco Method – Its Drilling and Production Engineering Significance

et al. 2011

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractA new laboratory method defined as the 'Aramco Method' developed by Saudi Aramco Scientists can play a pivotal role to reduce the mud related formation damage, enhance the oil and gas production and improve the return on investment. The experimental results produced by the method will provide a comparative assessment of the relative stability of different sized bridging materials that are available for non-damaging drill-in fluid formulations. The method provides a useful tool to select the most suitable and highly durable bridging material for designing and developing superior drill-in fluids to eliminate or reduce mud related formation damage while drilling.Preliminary experimental results produced by the method using a commercially available sized bridging material indicate significant variation in the PSD (particle size distribution) curve of sized bridging materials after testing due to the attrition effect and thus indicate a change in designed particle size distribution in down hole conditions. Material showing significant variation in the PSD due to the attrition effect during the test has the highest potential to cause formation damage. In case of low attrition resistant sized bridging material, there is a need to discard significant volumes of drilling fluid and to build fresh fluid in order to add new sized bridging material in the drill-in fluid system frequently to restore the desirable particle size distribution. On the other hand, material showing no or negligible variation in the PSD due to high resistance to attrition damage has the lowest potential to cause formation damage. Due to the preservation of the PSD of high attrition resistant bridging material for a long time, the drill-in fluid containing such material needs only infrequent addition of additional sized bridging material in the drill-in fluid system to maintain the desirable particle size distribution and eliminate or reduce the formation damage potential of the drill-in fluid. The engineering significance of the method is that it will provide a guiding tool to select the most suitable sized bridging material to reduce the formation damage potential of drilling mud while drilling and improve the well productivity while producing. The economic significance of the method is that it will reduce the mud management cost and enhance the return on investment by improving the ultimate recovery of oil and gas resources

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Drill-in Fluids for Multilateral MRC Wells in Carbonate Reservoir PSD Optimization and Best Practices Leads to High Productivity: A Case Study

Cited by 5 publications

References 0 publications

Rheological Roles on the Dynamic Behavior of Drill-in Fluid Invasion and Oil Permeability Restoration of the Damage Zone

Rheological Roles on the Dynamic Behavior of Drill-in Fluid Invasion and Oil Permeability Restoration of the Damage Zone

BMSI – An Index Parameter for Toughness and Durability Assessment of Sized CaCO3

The Aramco Method – Its Drilling and Production Engineering Significance

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