Producing a well. Folie 1
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1 roducing a well There are many steps in the life of a well. So far we saw how the well location was determined, it was drilled, logged, cased and cemented. To bring this well to production it first needs to be perforated i.e. the casing has to be perforated to allow the petroleum to flow inside. To stimulate the flow of oil acid might be injected to further clean out perforation debris and the microscopic cementation of the sand grains. If this does not produce the expected flow rates the reservoir can be fractured by applying pressure of over 1,000 bar at surface to physically crack the rock to increase permeability. We segment between primary and secondary or tertiary recovery or production. While the primary production works by the well s own pressure, secondary recovery requires various techniques to exploit as much oil as possible. Folie 1
2 erforation Shape charged explosive Copper particle jet Tip Gun positioned on wire line Gun fired Gun removed oil flowing After the well was drilled, logged, cased and cemented it is sealed off against the reservoir and no petroleum can flow. With perforation guns, holes are fired into the casing and rock for the oil and gas to flow. Shape charged explosives are precisely positioned at the reservoir layers and fired. The charges, up to 12 shots per foot, create a pressure jet of over 15,000,000 psi - 1,000,000 bar and a velocity of over 10,000 m/s at its tip. All material in front is atomised and holes up to 1 m long and over 1 (2.5 cm) in diameter are created for the oil to flow into the well. Folie 2
3 Wellhead Inspection valve Injection line Flow line Main valve Kill line Bleed off line Xmas tree Before the drilling rig has been removed, production tubing was installed and the heavy and high pressure rated BO is replaced by the Xmas tree. Through the inspection valve logging and perforation operations can be carried out without the presence of a rig. Offshore this valve assembly is implemented into a subsea manifold to be operated from a remote control room. Folie 3
4 roduction methods From the total available petroleum of a reservoir only a small portion can be recovered and produced. We differentiate three different production methods to enhance recovery rates. rimary production method Eruptive production Down hole pumps Surface pumps, horse heads Gas lifts --> 10-20% recovery Secondary production methods Water injection --> 30-40% recovery Tertiary production methods Steam injection olymer flooding, increase viscosity of injection water CO 2 flooding --> > 40% recovery Folie 4
5 Artesian oil production Well head assembly, Xmas tree T F roduction line To Oil/Gas/Water separator For completion, a tubing (e.g. 3 3/8 ) is run into the casing and locked it in a packer. Casing roduction tubing erforations Oil reservoir Annulus acker Oil flows through casing A packer seals the upper part of the casing off to reduce its corrosion. Oil is produced through the production tubing. Hydrostatic formation pressure pushes the petroleum, an oil-water-gas and sand mixture, to the surface. Folie 5
6 Reservoir depletion When reservoir pressure is high and the oil thin enough petroleum flows by natural force to surface. With time and depletion the reservoir pressure will constantly decrease. High pressure reservoir At one time well pressure is too low to keep the well flowing. Now a pump or other methods need to be implemented to keep the wells and the $ flowing. Depleted low pressure reservoir Folie 6
7 ES production T F To Oil/Gas/Water separator ES power supply roduction line ower supply cable Annulus is kept empty ES Electric Submersible ump To increase production of low pressure wells (formation pressure too low to press oil to surface) one can use subsurface pumps. Centrifugal pumps lowered a thousand meters below surface to pump petroleum are called electrical submersible pumps, or ESs. Folie 7
8 Gas lift T F T F To Oil/Gas/Water separator Gas injection Gas flow down Gas flow down Oil reservoir Reservoir pressure Specially for deeper wells gas lifts, rather than pumps are used to enhance recovery. Compressed gas (usually natural gas or CO 2 ) is pumped down the well through a second tubing (not shown). The compressed gas enters the production tubing and shoots upwards expanding and dragging the oil with it. Injection pressure and rate, casing pressure (specially with tubing injection) as well as flow line pressure and flow rate are often not measured and monitored to adjust optimal injection rate for max. flow. Folie 8
9 Walking beam, horse head OMV wellhead and pump Most commonly used are walking beam pumps usually called horse head pumps. In the US over 95% of all wells are pumped with such pumps. They are simple and reliable and last for ever. At the end of the sucker rod just above the reservoir is a piston pump lifting the oil to the surface. In many regions of the world these pumps became a common view in the landscape and a symbol of wealth. Folie 9
10 Water injection F F Crude out Water injection Crude out In order to maintain the pressure of a reservoir some appropriate wells are converted to water injection wells. The injected water front penetrates the formation. With time the water will slowly travel through the reservoir and push the oil towards the producing wells. roduction will rise. However, after some time the wells will produce more water than oil. The so called watercut can be 90% water by only 10% oil. Separators separate oil and water. Latter is being reinjected. Folie 10
11 Steam injection F F Crude out Steam injection Crude out etroleum in very shallow reservoirs is usually very viscose and at relatively low temperatures. A method to make even these oils flow at commercially interesting rates to the well is by injecting steam. The steam increases the reservoir pressure and also its temperature. Thus increasing the flow rate and the total oil recovery. Folie 11
12 Gas injection F F Crude out Gas injection Crude out In offshore and in remote locations, exportation of gas is much more difficult than of oil. For this reason most of the time gas used to be flared off. Nowadays the separated gas is also reinjected to maintain a good reservoir pressure and possibly for future exploitation. Some countries apply a high CO 2 -tax to released CO 2. To avoid this tax oil companies have a great interest in reinjecting this unwanted gas. Folie 12
13 Fracturing Well producing H injection for fracturing Small or closed fractures Large or open fractures A method to increase permeability of a reservoir and thus the ability of the petroleum to flow towards the well with only a little pressure loss is fracturing the formation. Strong pumps (also used for cementing the well) apply high pressure to the well. The rock physically cracks under the high pressure applied. Fine sand is injected to flush into the opened cracks. The sand grains keep the fractures open when pump pressure is released. Folie 13
14 Acid job H injection for fracturing Cleared formation Cleared fractures The flow from the reservoir into the openings done by the perforations might be blocked by perforation debris. Also the general permeability of the reservoir might be low due to a high degree of formation cementation between the individual sand grains. With the injection of e.g. 20% NaCl acid, the perforations are cleaned and the formation rock around the well becomes more permeable, in this way increasing the surface area of easy flow and thus the total flow rate. Folie 14
15 Injection well monitoring Water from pumping station FT SH Water injection RTU Chemical injection Well A FT SH Water injection RTU 900 mb RS 232 2OTG C, RTU or LC Well B Wellheads are always in remote and hostile locations. Monitoring of flow conditions (petroleum and injection) is still very poor. The flow and injection rates and pressures as well as chemical injection rates are transmitted to a central control station. Folie 15
16 Gathering station From well heads Group production line To pipeline and refinery Gas Manifold 3 phase separator Water production Typically some 20 wells are piped into a gathering station, satellite or cluster. All wells feed into one group production line. In the satellite station the wells can be tested individually. The station might have some instruments, control room and test equipment, but there is usually no automatic or sophisticated test set-up available. Folie 16
17 CO 2 water flood umping wells Injection wells roduced petroleum is separated into oil, gas and water. An additional plant isolates the unwanted CO 2. Injection wells press the CO 2 and water back into the reservoir. Folie 17
18 Offshore FV Floater FV DSV for manifold handling Mooring lines roduction manifold Flexible riser Wtr. injection manifold Riser manifold Riser structure base Satellite manifold structure Cluster production wells Satellite wtr. injection well Oil and gas export pipe lines A typical offshore production set-up for petroleum production and water injection from a floating production vessel. Flexibl risers connect the subsea base plate with the floating production vessel. A service vessel with mini submarines and divers maintains the subsea manifolds and satellite subsea wellheads. Folie 18
19 Offshore FV - top view Cluster wtr. injection well Cluster production well Floater Operations process controls export Flexible risers to floater roduction manifold W.I. manifold Manifold structure Reservoir A Oil export pipelines Gas export pipelines Riser base large Cluster production well W.I. manifold Cluster wtr. injection well Floating production vessel roduction manifold Cluster wtr. injection well Several km Manifold structure Reservoir B Satellite wtr. injection well The same completion in top view. There are 2 subsea manifolds to exploit reservoir A and B. Many water injection wells maintain crude production of a few production wells. A gas and an oil pipeline export the separated petroleum. Control and chemical injection lines are not shown. Folie 19
20 FSO, FV, tanker This example shows a FSO in the centre and a FV on the left both connected to several down hole manifolds. While the FSO stores its production in its own tanks the FV needs the tanker on the right for its crude storage. Folie 20
21 Welltesting Isolated well section being tested Land welltest; gas is flared off, oil stored The only way to estimate the size of the reservoir and the volume of recoverable petroleum is by testing the well. First time it is done with the drilling rig still on site. The result of the initial welltest has great influence on the wealth of a company since the stock market strongly reacts to the results. A welltest usually takes only 24 to 72 hrs., has slightly different flow conditions as compared to normal production and as such represents only a poor picture of the real well flow conditions. Under ideal conditions with accurate equipment the minimum error is ± 15%. Folie 21
22 Welltest set-up T T Separator Gas to flare Wellhead Choke manifold Sample tap Oil to burner Green Seadraggon A welltest setup consists of three sections Water to tank for disposal Stock tank for oil gauging Choke manifold; to reduce well pressure to separator pressure and adjust the flow rate. The manifold has one fixed and one variable choke - strong orifice type restrictions. Separator; to separate oil-gas-water. Operating pressure around 10 to 20 bar, rated 100 bar. Metering; flow meters (D and D) and gauge tank to determine the volume flow of oil, gas and water During the test the welltest operator takes open and pressurised samples of the fluid and gas to be analysed in the lab. The produced gas is always flared off, the water in the oil might be collected for disposal. Offshore the oil is usually burned off with a special burner at the end of a long boom alongside the rig. Folie 22
23 Three stage separator Control valve to adjust separator pressure Gas Breaker to free the gas Dome with cyclone to dry gas Crude oil/gas/water Water Heating coil Oil / water Oil separation / water separation Control valve to drain water Water Water Filter mash wire Wear Side glass + Displacer interface control Gas Oil Oil Control valve to adjust oil level Side glass + Displacer level control Oil The well fluid first hits breakers in a separator to break up the flow into small droplets. Gas breaks out and is further dried in a filter of meshed wire. A cyclone using the gas velocity and centrifugal forces takes the last liquids out of the gas. Folie 23 Oil and water is allowed to separate in a big vessel for a few minutes. Foam floats over the oil-water emulsion. The light oil swims at the top and runs over the weir into the oil section. Control valves keep the oil and crude level constant.
24 Instruments on separator Crude oil/gas/water Radiometric interface and level T Water Oil / water separation F G Water T T Gas Oil Oil L L L L F R T Gas Radar instead of displacer HH H Liquiphant L LL Oil Separators are thick walled vessels (>40 mm steel), have few openings and contain many obstructions. This makes the use of radar impossible, D is in direct contact with crude and displacers might block with sand (level indication is always good!) and require annual/ biannual maintenance (recommended from producer). Separators in refineries and on platforms require radiometric interface level measurements. Folie 24
25 Sand control Flow line Density meter Separator In most cases sand is produced together with petroleum. In older wells this sand can come to surface in quantities. Due to the fact that sand is not constantly produced but rather in slugs it is necessary to detect the sand slug before it enters the separator. Standard separators are not capable of handling sand, they fill up and have no space for petroleum separation left. To clean the separator it has to be opened and the sand removed manually by a volunteer! A density meter will detect the sand in petroleum and the flow will be diverted to a special sand treatment section. Folie 25 Click here to proceed to Index
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