Design of flow control devices in steamassisted gravity. Influence of geomechanical processes on absolute permeability. Summary coinjection of solvent with steam results in lower chamberedge temperatures than those in steamassisted gravity drainage sagd, which enables the decrease of heat losses to the overlying formation rocks. Pdf exploitation of extra heavy oil assets involves complex and costly production processes, one of which is. The main research objectives of this simulation and experimental study are to investigate oil recovery mechanisms under sagd process with different injection fluids, including steam, solvent or steam with solvent. However, suboptimal production techniques have led to a large carbon footprint and a subsequent search for more efficient extraction techniques, than open loop manual control. Pdf a new steam assisted gravity drainage process utilizing. Monitoring steamassisted gravity drainage sagd with eit. Sagd is an enhanced oil recovery technology for producing heavy crude oil and bitumen. Historically, natural gas has been used as a fuel for canadian oil sands projects, due to the presence of large stranded gas reserves in the oil sands area. Commercialization of the steamassisted gravity drainage sagd process has made recovery of heavy oilbitumen possible in a number of. Steam is injected into the reservoir from the top well, and an oil steamcondensate mixture is pumped out the production well. Steamassisted gravity drainage sagd is a drilling technique that is used to extract heavy oil that is too.
The capacity of world heavy oil and oil sands has been estimated to be as much as that of the worlds total discovered light and medium crude oils in place. Steam assisted gravity drainage sagd is process in which two horizontal wells, one vertically 5m above the other, are drilled into an oilrich region. Steam assisted gravity drainage sagd is an enhanced oil recovery process that uses injected steam to reduce bitumen viscosity and increase oil production. Steam assisted gravity drainage or sagd is a method that is widely used to extract bitumen from underground oil sands deposits.
In the vertical well steam assisted gravity drainage vwsagd. Characterization and comparison of dissolved organic. Solventsteam mixture is a key factor in controlling the economic efficiency of the solventaided thermal injection process for producing bitumen in a highly viscous oil sands reservoir. Delta venturi orifice steam trap animation duration. Recovery optimization of an oil reservoir by water flooding under.
Expandingsolvent steamassisted gravity drainage essagd is an in situ steam solvent recovery process to produce heavy oil and bitumen from oil sands reservoirs 214. Steam assisted gravity drainage sagd, since its inception over 30 years ago, has been developed into one of the primary thermal recovery processes for bitumen in canadian oil sands. Design of flow control devices in steamassisted gravity drainage. This onepage fact sheet provides a quick overview of the steam assisted gravity drainage process sagd and some statistics on the use of sagd in alberta. Steam assisted gravity drainage sagd is an effective method to produce heavy oil and bitumen which are important energy resources. It was found that cyclic steaming of the reservoir offers the most favorable option for heating the nearwellbore area to create conditions that improve initial sagd response. Thermal enhanced oil recovery eor market report 2018. Steam assisted gravity drainage sagd is an advanced form of steam stimulation, or an enhanced oil recovery technology. Steamassisted gravity drainage sagd process water contains high concentrations of dissolved organic and inorganic matter. Pdf steamassisted gravity drainage optimization for extra heavy. Use features like bookmarks, note taking and highlighting while reading fundamentals of enhanced oil recovery.
Steam assisted gravity drainage sagd is an effective method of producing heavy oil and bitumen. Fundamentals of enhanced oil recovery kindle edition by lake, larry w. This invention involves completing the horizontal well of a single well steam assisted gravity drainage swsagd system by drilling upwards, for the toe section of the well, where steam is to be injected, so steam injected proximate the toe section of the well is higher than the liquids. Results from this study include cumulative recoveries, temperature distributions, and production rates. Optimization of faststeamassisted gravity drainage for the energy.
On the evaluation of steam assisted gravity drainage in naturally fractured oil reservoirs seyed morteza tohidi hosseini a, shayan esfahani a, mehran hashemi doulatabadi a, abdolhossein hemmati sarapardeh a, amir h. Steamassisted gravity drainage an overview sciencedirect topics. It is widely used in alberta, canada for recovery of heavy oil and tar sand resources. In the steamassisted gravity drainage sagd process, heated oil drains from around growing steam chambers, driven by gravity, to lower horizontal wells. In this study, a modified version of utchem, which includes a thermal module to model thermal recovery processes, was used to design steam assisted gravity drainage, low frequency electrical heating and hot water flooding periods and a geochemical module of utchem was. Sand control in steam assisted gravity sagd wellbores. The top well injects steam to heat the bitumen, which separates from the sand and collects with the produced water in the lower well, approximately five metres below. Fundamentals of enhanced oil recovery, lake, larry w. In essagd, steam and solvent are injected into the depletion chamber within the reservoir. Models of steamassisted gravity drainage sagd steam chamber. This article is an open access publication abstract commercialization of the steamassisted gravity drainage sagd.
Drainage facts and stats steam assisted gravity drainage process in alberta, 80 per cent 2 billion barrels of the oil sands are buried too deep below the surface for open pit mining and can only be extracted by in situ in place methods such as steam assisted gravity drainage sagd. It is utilizing a major process automation system designed to. In a typical sagd approach, steam is injected into a horizontal well located directly above a horizontal producer. Simulation study of oil production rate and water coning in oil. This handbook contains test procedures for the analysis of steam assisted gravity drainage produced waters. A novel process utilizing vertical wells to enhance heavy oil recovery during steam assisted gravity drainage has been developed. Horizontal wells and steamassisted gravity drainage. Steam assisted gravity drainage sagd is used widely as a thermal recovery technique in canada to produce a very viscous bitumen formation. In the vertical well steam assisted gravity drainage vwsagd process shown in figure 1, the. Mamora steam assisted gravity drainage sagd is used widely as a. On the evaluation of steam assisted gravity drainage in. Steam assisted gravity drainage sagd is a thermal recovery technology used to produce heavy oil and high viscosity bitumen from alberta oil sands. Dimethyl ether as an additive to steam for improved steam. Steamassisted gravity drainage sagd is a successful thermal recovery process, besides demanding a high amount of energy, water, and natural gas butler, 1994.
Pdf a novel process utilizing vertical wells to enhance heavy oil recovery during steam assisted. The displacement or the oil is systematic and high recoveries can be obtained. Pdf waterflooding performance in inclined communicating. Steamassisted gravity drainage sagd is a successful thermal recovery process, besides demanding a high amount of.
A method for accelerating startup for steam assisted gravity drainage operations comprising the steps of. The applications of established thermal processes, such as sagd, are commonly required to achieve economic hydrocarbon recovery. Despite successful experiences of steam assisted gravity drainage sagd in sandstone and some studies of this process in fractured reservoirs, the impact of heterogeneity and its relative solutions have not been assessed yet. This independent 185page report guarantees you will remain better informed than your competitors. Based on sagd technology theory and heat transfer theory, two calculation model methods, observation well temperature method and steam chamber edge. The work presented in this paper describes the evaluation and stepwise optimization process for a steam assisted gravity drainage sagd project using a representative sector model from a field. In a typical sagd approach, steam is injected into a horizontal well located directly above a horizontal producer helping to displace heated oil. Steam assisted gravity drainage sagd is an outstanding example of a steam injection process devised for a specific type of heavy oil reservoir utilizing horizontal wells. Download it once and read it on your kindle device, pc, phones or tablets. Microfluidic analysis of porescale petroleum recovery in. Mathematical modeling of steamassisted gravity drainage. As the oil drains, the steam chamber advances into the reservoir. This compares to mining where sand is extracted with oil steam assisted gravity drainage sagd process. Utf operation first phase in 1987 insitu sagd is a type of in situ technology sand left in place in situ latin for in place.
Treating sagd blowdown with the saltmaker evaporator. As reserves become harder to recover projects using steam assisted gravity drainage sagd are becoming increasingly common because of challenging production demands and a wish to maximize reservoir deliverability. Steam assisted gravity drainage sagd is an enhanced oil recovery technology for producing heavy crude oil and bitumen involving an advanced form of steam stimulation. The work presented in this paper describes the evaluation and stepwise optimization process for a steamassisted gravity drainage sagd project using a representative sector model from a field. Pumping solutions for steam assisted gravity drainage sagd.
This process generates produced water alongside oil production and recycles the water as much as possible before blowdown is required. Handbook steamassisted gravity drainage water analysis. The resulting oil and condensed steam emulsion produced from each well pad is then pumped back to a central processing facility cpf for separating, treating, and shipping. Sagd requires a lot of energy to generate the injected steam, implying a substantial cost. Roger butler, introduced the concept of steam assisted gravity drainage sagd.
Steam assisted gravity drainage facts and stats open. Singlewell sw sagd attempts to create a similar process using only one horizontal well. Meg energy uses steamassisted gravity drainage, or sagd, technology to recover bitumen in sagd operations, pairs of stacked horizontal wells are drilled into the reservoir about 400 metres beneath the surface. An assessment of opportunities for cogenerating electricity to reduce greenhouse gas emissions in the oil sands. Microfluidic analysis of porescale petroleum recovery in steam assisted gravity drainage abdul haseeb syed master of applied science graduate department of mechanical engineering university of toronto 2015 steam assisted gravity drainage sagd is an insitu method of extracting bitumen and involves the injection of steam into the oil sands. A numerical analysis of the singlewell steam assisted gravity drainage swsagd process. Two horizontal wells are drilled into the oil reservoir, one a few meters above the other.
Steamassisted gravity drainage sagd oil recovery technology. Quick screening of paretooptimal operating conditions for. Over 90% of the worlds heavy oil and oil sands are deposited in canada and venezuela. A wide range of analytical techniques including electrospray ionization mass spectrometry, gas chromatographymass spectrometry, fourier transform infrared spectrometry, and fluorescence spectrophotometry have been utilized for the identification and measurement of. However, the economics of this process are highly sensitive to the efficiency of steam creation, delivery, and use, with a successful and unsuccessful sagd well pair often separated by how effectively. This paper depicts a strategy to quickly provide tradeoff operating conditions of the expanding solventsteam assisted gravity drainage essagd process based on paretooptimality. Us20120227965a1 method for accelerating startup for. Study of the parameters of steam assisted gravity drainage. Highpressure steam is continuously injected into the upper well and into the. This method involves forcing steam into subsurface oil sands deposits to heat the bitumen locked in the sand, allowing it to flow well enough to be extracted.
For a typical 16 hectare well spacing, the pressure drawdown is as small as one. Computer simulation of singlewell steam assisted gravity. Us20140000888a1 uplifted single well steam assisted. This technology is particularly relevant in canada because it is the primary method of in situ extraction. The oil sands of alberta are unconsolidated sands which require sand control within the horizontal wellbores to reduce the erosive power of the sand and plugging of sand control screens. Steamassisted gravity drainage sagd is a techniquethat has been developedto ef. More favorable reservoir conditions such as low viscosity, thick oil zones, and solution gas, improved reservoir. Steam assisted gravity drainage sagd is a successful thermal recovery process, besides demanding a high amount of energy, water, and natural gas butler, 1994. Impact of reservoir heterogeneity on steam assisted. Commercialization of the steamassisted gravity drainage sagd process has made recovery of heavy oilbitumen possible in a number of reservoirs hindered by hydrocarbon immobility. Download pdf info publication number us20140000888a1. Bacteria, apb bacteria, hab bacteria, irb bacteria, slym bacteria, srb chloride, hr, ise chloride, titration chlorine, hr, free chlorine, total conductivity tds hardness, total hardness, ca hydrazine. Improved steam assisted gravity drainage sagd performance with solvent as steam additive.
A numerical analysis of the singlewell steam assisted. Sagd involves drilling a pair of 1 km long horizontal wells, one about 5 m above the other, from a. Alberta is recognized by its vast oil sands reserves. Pdf steamassisted gravity drainage optimization for. Abstract in the steamassisted gravity drainage sagd process, heated oil drains from around growing steam chambers, driven by gravity, to lower. Controlling postcompletion flow in steamassisted gravity. Clydeunion can offer pumping solutions at all stages of these processes. A study of steam assisted gravity drainage performance in the presence of noncondensable gases.
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