Excessive water production is one of the main wellknown problems that would face any oil operator in the world. State shuts 12 oil company wells that pumped waste into. Producing wells declining in the shallowwater gulf of. Mechanical methods are usually used to deal with wellbore water shutoff or near. The operator had to shut it in for 54 months because of high water cut. Seright, spe, new mexico petroleum recovery research center. Water control results in increased economic recovery in the well d. Deepwater producing wells are on a different trajectory than shallow water with new wells replacing those that are shut in. Methods of shutting off water in oil and gas wells. Xmax offers an easy to deploy solution for zonal water shut off, creating a permanent barrier in the reservoir resulting in optimised. Despite huge losses oil companies reluctant to shut in. 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. Shutoff flow in csg, gravel packs, perf tunnels, annuli, and micro annuli, selectively reduce or shutoff water production in oil and gas wells custom made neo products equipment used with neo plastic can eliminate undesirable flow from midinterval perforations while still producing from perforations above and below the isolated interval. Overview of water shutoff operations in oil and gas wells mdpi.
Well performance becomes strongly affected by water influx, and early shut in may be expected with such a poor economics. But it can also help to improve the lifetime of the well, by reinjecting the produced water. Gel treatment field application survey for water shut off. This was a 44% decrease in the oil rate and a 40% reduction in water from the rates after the firs t treatment. The heterogeneous nature of the rock causes water and oil in the reservoir to follow paths of least resistance. A significant percentage of oil production wells in california have water to oil ratios exceeding 95%. Principal focus is productionrelated near wellbore damage and remedial water control practices. 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%. Lane, spe, northstar technologies international, and r. Downhole remediation for mature oil and gas wells is presented from a practical point of view.
Spepetroleum society of cim 65527 gel water shutoff in. The water cut in waterdrive reservoirs can reach very high values. 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. Mature oilfields usually encounter the problem of high watercut. Water shutoff treatments using chemical which perform when mechanical water shutoff treatments are obviously inapplicable, when the reservoir reach it is critical depleted. Energy saving opportunities in the oil production sector. Disposal wells primarily handled byproduct effluent from high water ratio producing gas and oil wells. Water production causes major economic and operational problems. Good water is that water produced at a rate below the water oil economic limit i.
Modelling gelation time of organically crosslinked watershutoff systems for oil wells marfo sa1, appah d 2, joel of3 and oforisarpong g4. Smartwell system technology, introduced in 1997, was the industrys first intelligent well completion system. Qatardecreasing water cut while increasing oil production. 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.
Modelling gelation time of organically crosslinked water. A gulf of mexico well in the calcarenitas formation was drilled as an oil producer and completed with a 7in 177. Us20160068737a1 gelling agent for water shutoff in oil. Presented at the annual spe international conference and exhibition, tinapacalaber, nigeria, 31 july7 august 2010.
Project report water shut off free download as word doc. Pdf overview of water shutoff operations in oil and gas. Studies on cross linked polymer gel system for water shut. The ratio of water produced compared to the volume of total liquids produced. Despite huge losses oil companies reluctant to shut in production. Regenerating depleted oil and gas wells using water shut.
Halliburton is the worlds leading provider of intelligent completion technology to the upstream oil industry. A white paper describing produced water from production of. Gel water shutoff in fractured or faulted horizontal wells. One barrel of water has the same production cost as one barrel of oil. This paper was prepared for presentation at the spe permian basin oil and gas recovery. Let tiorco help select candidate projects to achieve rapid payback, reduced opex and low cost incremental oil recovery. Good water, then, is that water that cannot be shut off without reducing oil production. Unwanted water production is one of the biggest challenges when looking to optimise hydrocarbon production from a well. 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. Produced water can cause damage in the reservoir, in the subsurface tubular, surface equipment etc.
Wells elsewhere in the world average 3 bbl of water for each barrel of oil khatib and verbeek 2003. Understanding inter well connectivity within your reservoir march 22, 2018 stephen whitaker. 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. Water source, injection and disposal service wells summary.
It is practical to use chemical methods for water shutoff in production wells, however conventional water shutoff agents have. 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. Comprehensive diagnostic and water shutoff in open and cased hole carbonate horizontal wells. Current focus on exploitation of unconventional resources shale gas.
Successful utili zation of fiber optic telemetry enabled coiled tubing for water shutoff on a horizontal oil well in ghawar field. Water shut off treatments in oilfield by micro and nano. Excess water production diagnosis in oil fields using. 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. In order to increase profitability, oil companies are putting an effort to reduce water production by executing water shutoff treatments. Second, when early gas breakthrough occurs, oil flow in the reservoir and wellbore will be severely impeded because gas has higher mobility than oil. Open fractures and high permeability layers usually reduce the efficiency of. 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.
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. Twentyeight exploration agreements were negotiated, 17 of which were between the canadian oil and gas lands administration cogla and various oil and gas. Problems arise when water production rate exceeds the wor economic level, producing no or little oil. Project report water shut off petroleum reservoir oil well. Spe 70067 a strategy for attacking excess water production.
Consequently, the ability to shut off high water and or gas producing zones in a horizontal well would result in. Shutoff solutions for excess water and gas production. The polymer gel technology in hydrocarbon industry had its beginning from 1960s. Our optimized gel solutions for water shutoff yield better reservoir drawdown. 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 fractional water flow is dictated by the natural mixing behavior that gradually increases water oil ratio wor. 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.
In hydrocarbon production, more often than not, oil is produced commingled with water. Finally higher water out resulted in the wells to be closed. Chemicals are more expensive than mechanical water shutoff treatments. Water control to increase well productivity and potential reserves. An introduction to enhanced oil recovery techniques. 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. 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. Water shutoff controls a serious problem in oil producing reservoirs is increasing water cut. The application of water shutoff technique in jidong oilfield. Recent advances in horizontal well water shutoff and production.
It reduces the sweep efficiency hence reduces the ultimate oil recovery from the reservoir. Eliminating water cut with water shutoff treatment. The pvc tube wellbore was filled with ge l and then placed in the oven whose temperature was fixed at 65. Integration of technical problems and diagnosis of high. 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. 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. Thirdly, the complex requirements of the project make polymer flooding an expensive option and therefore difficult for small or medium enterprises to put. Historically, water source wells were drilled to supply injection wells for water flooding of oil pools.
Discussions include decision processes for selection, design, and application of methods that are supported by field experiences and research results. Water shutoff conformance control poweltec wso cc processes have been successfully applied in more than 100 field cases worldwide, i. It has been developed a novel chemical based water shutoff technology for reducing water cut and increase crude oil production in mature fields. Overview of water shutoff operations in oil and gas wells.
207 1376 770 1184 1266 626 682 1030 468 828 393 1275 1541 1079 603 899 1452 664 349 997 73 851 201 504 394 1027 1323 68 532 276 1355 85 1452 1170 551