Water source, injection and disposal service wells summary. Water shutoff controls a serious problem in oil producing reservoirs is increasing water cut. Mature oilfields usually encounter the problem of high watercut. Project report water shut off petroleum reservoir oil well. Project report water shut off free download as word doc. Historically, water source wells were drilled to supply injection wells for water flooding of oil pools. As long as the water production rate is below the economic level of water oil ratio wor, no water shutoff treatment is needed. The pvc tube wellbore was filled with ge l and then placed in the oven whose temperature was fixed at 65. Recent advances in horizontal well water shutoff and production. Spe 70067 a strategy for attacking excess water production. Water control results in increased economic recovery in the well d. For crude oil wells nearing the end of their productive lives, water can comprise as much as 98% of the material brought to the surface. Excess water production diagnosis in oil fields using. Energy saving opportunities in the oil production sector.
The heterogeneous nature of the rock causes water and oil in the reservoir to follow paths of least resistance. The following procedure could be altered in emergency situations to use the annular preventer and motion compensator for cases in which the shut in drillpipe pressure and shut in casing pressure are low and near the same value indicating oil or water, or the kick volume is less than 20 to 30 bbl and the time to kill the well is less than 2. Mechanical methods are usually used to deal with wellbore water shutoff or near. This paper was prepared for presentation at the spe permian basin oil and gas recovery. Despite huge losses oil companies reluctant to shut in production. Discussions include decision processes for selection, design, and application of methods that are supported by field experiences and research results. Aubin has developed the xmax toolbox to enable water shut off downhole and in turn improving field economics and creating value for operators.
The operator had to shut it in for 54 months because of high water cut. Results were 4 oil wells, 7 gas wells, 1 oil and gas well, 10 dry wells, 1 well under a tighthole status, 1 relief well, and 12 wells continuing drilling andor evaluation at year end. This was a 44% decrease in the oil rate and a 40% reduction in water from the rates after the firs t treatment. In recent years oil production of the wells have begun to decline due to water out of the wells, especially water rates in part of the wells were more than 98%. The water cut in waterdrive reservoirs can reach very high values. Eliminating water cut with water shutoff treatment. Do not use this form for proposals to drill new wells, significantly deepen existing wells below current bottomhole depth, reenter plugged wells, or to. The polymer gel technology in hydrocarbon industry had its beginning from 1960s. Using the testing facilities at our houston site and then working alongside some of the major oil corporates, in offshore environments across the globe, we have invented an effective water shut off solution, which reduces water cut and increases oil production, even in wells that previously produced 100% water. Integration of technical problems and diagnosis of high. Principal focus is productionrelated near wellbore damage and remedial water control practices.
Water shutoff treatments using chemical which perform when mechanical water shutoff treatments are obviously inapplicable, when the reservoir reach it is critical depleted. The application of water shutoff technique in jidong oilfield. State officials have ordered oil companies to shut 12 more wells that injected oil field wastewater into drinkable aquifers beneath californias droughtstricken central valley, regulators. Smartwell system technology, introduced in 1997, was the industrys first intelligent well completion system. Modelling gelation time of organically crosslinked water. Thirdly, the complex requirements of the project make polymer flooding an expensive option and therefore difficult for small or medium enterprises to put.
Excessive water production is one of the main wellknown problems that would face any oil operator in the world. An introduction to enhanced oil recovery techniques. The composition is formed by mixing polyvinyl alcohol, a polyvinyl alcohol copolymer, or mixtures thereof with an aminoaldehyde oligomer, such as urea formaldehyde or melamine formaldehyde, with or without a crosslinker. Water production causes major economic and operational problems.
Methods of shutting off water in oil and gas wells. Finally higher water out resulted in the wells to be closed. Gel water shutoff in fractured or faulted horizontal wells. Xmax offers an easy to deploy solution for zonal water shut off, creating a permanent barrier in the reservoir resulting in optimised. Deepwater producing wells are on a different trajectory than shallow water with new wells replacing those that are shut in. Water shutoff and conformance improvement for oil and gas. Thus water shut off and conformancecontrol treatments can be used to generate relatively large volumes of incremental oil production with low costs and selectively, targeted small volume treatments, which extends the economic lives of marginal and mature wells. Comprehensive diagnostic and water shutoff in open and cased hole carbonate horizontal wells. Water shutoff conformance control poweltec wso cc processes have been successfully applied in more than 100 field cases worldwide, i. In water flooding operations, the aim is to mobilize the oil in the matrix rock toward the production wells and to main tain the pressure of the reservoir. Disposal wells primarily handled byproduct effluent from high water ratio producing gas and oil wells. Good water, then, is that water that cannot be shut off without reducing oil production. Us20160068737a1 gelling agent for water shutoff in oil. Seright, spe, new mexico petroleum recovery research center.
Well performance becomes strongly affected by water influx, and early shut in may be expected with such a poor economics. In hydrocarbon production, more often than not, oil is produced commingled with water. Presented at the annual spe international conference and exhibition, tinapacalaber, nigeria, 31 july7 august 2010. Overview of water shutoff operations in oil and gas wells mdpi. But it can also help to improve the lifetime of the well, by reinjecting the produced water. It reduces the sweep efficiency hence reduces the ultimate oil recovery from the reservoir. The fractional water flow is dictated by the natural mixing behavior that gradually increases water oil ratio wor. Studies on cross linked polymer gel system for water shut. Shutoff solutions for excess water and gas production. Unwanted water production is one of the biggest challenges when looking to optimise hydrocarbon production from a well. A gulf of mexico well in the calcarenitas formation was drilled as an oil producer and completed with a 7in 177.
Lane, spe, northstar technologies international, and r. Due to higher mobility and permeability, water production overtakes oil production from the lowpermeability zone, resulting in high water cut production, poor sweep efficiency and poor economics. Problems arise when water production rate exceeds the wor economic level, producing no or little oil. To shut off water and recover oil production in a horizontal section, an operator in qatar found it necessary to run tools through a completion with a narrow internal diameter of 3.
Spepetroleum society of cim 65527 gel water shutoff in. From 2002, there have been 800 or more producing deepwater wells most years, hitting a high in 2007 at 867 and numbering 819 in 2017. The ratio of water produced compared to the volume of total liquids produced. Despite huge losses oil companies reluctant to shut in. Halliburton is the worlds leading provider of intelligent completion technology to the upstream oil industry. Although water cut recent reports of eldest field in the has reached the 98%. Let tiorco help select candidate projects to achieve rapid payback, reduced opex and low cost incremental oil recovery. A 3d simulation model was used to investigate the effect of water areal coning and channeling through fractures on wor and wor derivative trends in vertical. In natural water drive reservoirs, high water production rates and fluid levels can result in uneconomic wells. In order to increase profitability, oil companies are putting an effort to reduce water production by executing water shutoff treatments. Downhole remediation for mature oil and gas wells is presented from a practical point of view. Understanding inter well connectivity within your reservoir march 22, 2018 stephen whitaker. Chemicals are more expensive than mechanical water shutoff treatments. A significant percentage of oil production wells in california have water to oil ratios exceeding 95%.
Good water is that water produced at a rate below the water oil economic limit i. Consequently, the ability to shut off high water and or gas producing zones in a horizontal well would result in. Qatardecreasing water cut while increasing oil production. Wells elsewhere in the world average 3 bbl of water for each barrel of oil khatib and verbeek 2003. The gelling agent for water shutoff in oil and gas wells is a composition that forms a gel to reduce or eliminate the flow of water in a gas or oil well. This technology employs polymeric gel beads micron size range suspendend in an organic solvent, hereinafter referred to as smart w, which can swell selectively in contact with formation water and. Regenerating depleted oil and gas wells using water shut. Gel treatment field application survey for water shut off.
It has been developed a novel chemical based water shutoff technology for reducing water cut and increase crude oil production in mature fields. Twentyeight exploration agreements were negotiated, 17 of which were between the canadian oil and gas lands administration cogla and various oil and gas. Current focus on exploitation of unconventional resources shale gas. Our optimized gel solutions for water shutoff yield better reservoir drawdown. Pdf overview of water shutoff operations in oil and gas. Open fractures and high permeability layers usually reduce the efficiency of. Spe 99371 when and where relative permeability modification water shutoff treatments can be successfully applied 3 well is put back on production, a relativepermeability water block will form just beyond the outermost penetration of the treatment. Producing wells declining in the shallowwater gulf of. Water shut off treatments in oilfield by micro and nano. Successful utili zation of fiber optic telemetry enabled coiled tubing for water shutoff on a horizontal oil well in ghawar field.
Modelling gelation time of organically crosslinked watershutoff systems for oil wells marfo sa1, appah d 2, joel of3 and oforisarpong g4. Overview of water shutoff operations in oil and gas wells. One barrel of water has the same production cost as one barrel of oil. It is practical to use chemical methods for water shutoff in production wells, however conventional water shutoff agents have. A white paper describing produced water from production of. Second, when early gas breakthrough occurs, oil flow in the reservoir and wellbore will be severely impeded because gas has higher mobility than oil. Produced water can cause damage in the reservoir, in the subsurface tubular, surface equipment etc.
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