A New Technique to Confidently Characterize Wettabilty Alterations Induced by Drilling/Completion/Workover Fluids
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A New Technique to Confidently Characterize Wettabilty Alterations Induced by Drilling/Completion/Workover Fluids D.N. Rao; D.N. Rao Louisiana State University Search for other works by this author on: This Site Google Scholar Z.A. Bassiouni Z.A. Bassiouni Louisiana State University Search for other works by this author on: This Site Google Scholar Paper presented at the SPE/DOE Improved Oil Recovery Symposium, Tulsa, Oklahoma, April 2000. Paper Number: SPE-59516-MS https://doi.org/10.2118/59516-MS Published: April 03 2000 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Get Permissions Search Site Citation Rao, D.N., and Z.A. Bassiouni. "A New Technique to Confidently Characterize Wettabilty Alterations Induced by Drilling/Completion/Workover Fluids." Paper presented at the SPE/DOE Improved Oil Recovery Symposium, Tulsa, Oklahoma, April 2000. doi: https://doi.org/10.2118/59516-MS Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Search Dropdown Menu nav search search input Search input auto suggest search filter All ContentAll ProceedingsSociety of Petroleum Engineers (SPE)SPE Improved Oil Recovery Conference Search Advanced Search AbstractFormation damage, although limited to the near-wellbore regions of the reservoir, plays a major role in productivity impairment simply because all the produced fluids must flow through this region. This damage could consist of permeability reduction due to deposition of particulate matter (fines, mud solids, asphaltenes etc.) as well as wettability alteration. While the permeability reduction and its possible remedies have been well-characterized in laboratory core floods, the wett ability alterations induced by the interactions between the rock and the various fluids used in drilling, completion and workover operations have remained difficult to characterize. This difficulty is mainly due to the uncertainty in the techniques we have been using to characterize wett ability, which has led to an aura of skepticism surrounding laboratory measurements of wett ability. Some of the reasons for this state of affairs are the lack of reproducibility of contact angle measurements even after using live reservoir fluids and long aging times, and the unrepresentative (or non-reservoir) conditions under which the Amott and USBM tests are generally carried out.This paper presents the recently developed dual-drop dual-crystal (DDDC) technique which has been used successfully in several oil-field applications to generate reproducible measurements of both the water-advancing and water-receding contact angles at reservoir conditions of temperature and pressure using live reservoir fluids. Unlike the conventional contact angle tests, which require 30–40 days to complete, the new technique enables these measurements within 2–3 days while assuring measurement accuracy within about 2–3 degrees. The paper presents the methodology and salient features of the new technique, some of the recent results to demonstrate its accuracy and short run times, and actual reservoir cases involving serious wett ability shifts caused by brine incompatibility, scale deposition, temperature variation and a workover fluid invasion. Due to its accuracy, short run duration and operability at reservoir conditions, the new technique offers excellent potential for detailed understanding of the influence of the various components of drilling/completion/workover fluids on wett ability alteration, screening and optimization of fluids for field applications, and evaluation of remedial measures to combat formation damage. Keywords: crude oil, reservoir conditions, formation damage, waterflooding, relative permeability, contact angle, fluid dynamics, completion, wettability, solid surface Subjects: Reservoir Fluid Dynamics, Improved and Enhanced Recovery, Flow in porous media, Waterflooding This content is only available via PDF. 2000. Society of Petroleum Engineers You can access this article if you purchase or spend a download.Keywords:
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Various drilling methods have been introduced since 1980s, where horizontal well drilling has become one of the popular methods in drilling the oil and gas wells. In the horizontal well drilling, a well system consists of casing and tubing are the backbones for drilling, production and workover operations.
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Abstract Handil field is a giant oil field in Indonesia which started discovery since 1975. Currently, Handil Field has production around 12,000 bopd and 44 MMSCFD of gas. Through new wells data in the Handil Field from 2018 to 2022, there are around 55% of tubingless completion wells that have a main focus on producing gas reservoirs in the Handil Main Zone and Deep Zone. During drilling operation, sometimes it was found several oil reservoirs based on open hole logging result on well which will be completed by tubingless completion. To switch the completion from tubingless completion into oil well completion will make the well completion will be delayed, therefore the well will be completed with tubingless completion. Over time, where the gas reservoirs begin to deplete, there are still others oil reservoir layers in this well that wait to be produced. Due to low reservoir pressure and no gas lift facility in the tubingless well completion, thus these oil reservoirs cannot be produced. The previous solution that has been implemented is to do heavy workover, by cutting upper completion and replacing it with a new completion that includes a side pocket mandrel; or do a light workover by installing a Gas Lift Macaroni inside the existing tubing. Both solutions have disadvantages, because of high operational cost and the second solution will reduce the flow area in the tubing. Annulus Oil Based Mud Circulation is the latest solution implemented in the Handil Field, which utilizes the existing annulus to perform gas injection and then followed by the installation of Gas Lift Pack Off (GLPO) or Siphon String. This work begins with tubing punch at a depth where the gas lift injection point will be used, then proceeds to circulate OBM from the annulus to the waste tank, then followed by installation of GLPO or siphon string. This method has advantages, there are no heavy workover is required, no additional spool is needed on the tubing hanger for gas injection, and has a faster work duration compared to the two previous methods. Through this method, out of a total of 11 tubing less wells, there is a remaining stake of 1200 kbbls in the oil reservoir which has been successfully unlocked and some have been produced through this method and lifts with gas lift deepening, and there is still a remaining stake of 746 kbbls as a future candidate to be generated through the application of the OBM Annulus circulation method. This method is particularly applicable to old oil fields where there is residual oil-based mud in the annulus of several depleted gas wells and there are still oil layers that need to be saved.
Workover
Gas lift
Annulus (botany)
Wellhead
Natural gas field
Coiled tubing
Wellbore
Oil well
Installation
Artificial lift
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In the petroleum industry, reservoir and drilling engineers always give special attention to formation damage, which is also known as wellbore damage. Formation damage can restrict or prevent effective depletion of crude oil from a reservoir. Contact with a foreign fluid is the basic cause of formation damage. This foreign fluid may be drilling mud, completion or workover fluid, stimulation or well treating fluid, or even reservoir fluid itself if the original characteristics are altered. The research study done by Krueger [1] found that most field operations such as well drilling, well completion, production, and well stimulation are potential sources for formation damage. Nowadays, there are various methods can be used to combat formation damage. One of them is acidizing. The oil and gas industry has been acidizing oil and/or gas bearing formations since the 1890s. Acids may be used to reduce damage near the wellbore in all types of formations. Inorganic, organic, and combinations of these acids are used in variety of well stimulation treatments.
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Abstract The Handil field is a giant mature oil field in Indonesia. It has been producing since 1975 with current recovery factor for oil is 49% and gas is 57%. Cumulatively, oil had been produced around 855 MMstb and gas around 1.68 Tcf. Now, from this field, oil is being produced at 20,000 bopd, gas at 75 mmscfd and water at 130,000 bwpd. One of the feasible and economic ways to recover the remaining oil at this late stage of field production is by doing a Light Workover technique. This technique aims to change the well status without pulling out the existing completion. This technique is considered the optimum way to maintain the field production performance up to now. One of Light Workover technique is to do re-completion by inserting smaller completion inside existing completion. An innovative spool adapter was utilized to be able to run smaller completion and sit above existing wellhead. Hence, from three (3) depleted gas wells that were converted into oil wells, all wells are still producing and economically had been paid out the intervention cost. This technique is considered applicable for a mature oil field where some gas wells had been depleted and oil layers are exist.
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Wellhead
Oil well
Natural gas field
Oil Production
Water well
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This two-volume set of books encompasses well production operations from the time the first potential oil or gas horizon is penetrated until the well is abandoned. Primary focus is on well completions, workovers, and stimulation, which are critical to producing operations. The objective of completing a well is to obtain, and to maintain effective communication with the desired reservoir fluids and is the focal point of exploration and production activities. The technology required for effective well completion is very complex. The importance of total reservoir description is emphasized including geology and fluid flow characteristics, the role of communication between the reservoir and the wellbore, the pitfalls of flow restriction around the wellbore, and the importance of knowing where fluids are and in which direction they are moving. Problems are involved in excluding undesired fluids. Waterflooding and other enhanced methods are used to maximize recovery of hydrocarbon fluids. Topics included in Volume I are: geologic considerations, reservoir considerations in well completions, well testing, primary cementing, well completion design, tubing and subsurface control equipment, perforating oil and gas wells, and completion and workover fluids.
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The drilling and shut-in regulations for peripheral oil fields currently follow the standard of the old area of placanticline, i.e., the wellhead pressure of water injection wells within 600m of the drilling well is reduced to below 3MPa before drilling. The regulations did not take into account the depth of the target formation, structural development, reservoir properties and oil and water well connectivity in the peripheral oilfield, which made it difficult to relieve pressure in most of the wells and resulted in longer drilling and shut-in cycles and greater impact on production. In order to minimize the impact of drilling and shut-in on field development and to explore drilling and shut-in limits and standards suitable for peripheral fields, drilling tests were conducted in Block A for infill wells. The feasibility of high pressure drilling in the peripheral low permeability oilfield was analyzed by analyzing the drilling site conditions, the quality of post-completion cementing and the logging data of the completed wells under different pressure conditions.
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Shut down
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Jianghan Oilfield has gone into the middle and late development stage and the casing failure in oil and water wells is very serious.A series of technologies in washover,replacing casing and casing tieback and so on have been developed,obtaininggood application effect.By the end of February,2009,accumulatively increased oil production is 23099.9t in Jianghan oil area,with increased waterflood volume of 79688m 3.Because of sufficiently using original wellbore in the well needed to replace casing,a part of the expenses of casing and pipe network construction on surface of the earth can be saved.Through repairing oil and water wells,well pattern adjustment efforts have been improved,which may meet the well pattern adjustment plan in the oil area at late stage of oil field development.What's more,the damaged casings taken out from oil and water wells provide the concrete samples for analyzing the reasons why casings are damaged,also providing the foundation for taking casing protection plan in the oil field.
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Abstract Gas drilling began in the 1950s. The drilling process is implemented by injecting a mixture of air and water into the well with an air compressor. Field experiments have gradually proved that air drilling in hard rock can improve the ROP by 2 ∼ 3 times, especially in reservoir protection. In this paper, the gas drilling technology is analyzed and discussed. The test results of gas drilling technology show that the drilling time is reduced and the mechanical ROP is greatly improved. Compared with mud drilling, the mechanical ROP of gas drilling in the same structure and well section is generally increased by 2 ∼ 10 times, the production of oil and gas wells is relatively high and the economic benefit is remarkable.
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Well completion is the process of making a well ready for fluid production or injection after drilling operations. This mainly includes equipment consisting of Christmas tree, casing, tubing, packer and downhole equipment required by the project. Casing and tubing in either oil and gas or geothermal wells are designed to withstand pressure loads (burst and collapse) and axial tension. However, in geothermal applications, temperature is a major consideration in casing design because of thermal stresses generated by the high temperature geothermal fluids. One of the most important factors regarding the workover of geothermal wells is the chemical composition of water. The chemical composition of water can cause two major problems, corrosion and scale. The main part of the paper will describe the completion of geothermal wells, the problems that engineers encounter in completion and workover of geothermal wells and in the last part of the paper, examples from Croatia and world will be presented.
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Drilling engineering
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Gas drilling has been widely applied because of its enormous advantage in protecting gas field,improving drilling rate,etc.However,the issue of hole deviation has not been appropriately solved,it still restricts the development of gas drilling.At present the study on gas drilling in terms of borehole deviation mechanism and control method is very few and has not form a theory of large scale systems at home and aboard.According to some examples of gas drilling in Daqing Oilfield,the reasons are analyze for deviation of gas drilling from many aspects such as geological factor,borehole diameter expanding,drilling parameter,hole drift angle,circulation medium of drilling,etc.Base on the analytic result and the site example of drilling,tentative diagnosis measures has been given to gas drilling control measures,this result laid a solid foundation for the design and construction of gas drilling.
Measurement while drilling
Natural gas field
Underbalanced drilling
Lost Circulation
Well drilling
Drilling engineering
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