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1 General Provision
1.0.1 This code was established with the view to unity the design code and technical requirements for oilfield water injection (including polymer injection), to make the design achieve state-of-art technology, economy and rationality, safety and suitability.
1.0.2 This code is applicable to design of water injection for the onshore oilfield, construction for polymer injection, extension and reconstruction projects.
1.0.3 Not only the requirements stipulated in this code, but also those in the current relevant ones of the nation shall be complied with for design of oilfield water injection and polymer injection.
2 Terms
2.0.1 Water injection
It is referred to the technology injecting water into oil layer to maintain reservoir pressure and improve recovery efficiency. It comprises several modes: conventional water injection, inverse water injection, commingled water injection, split water injection, mixed water injection, alternate water injection and intermittent water injection.
2.0.2 Water-injection station
It is referred to the station used for supplying injected water well-flushing water to the injection well.
2.0.3 Conventional water injection
It is referred to technology of leading injected water to oil layer through the oil pipe of injection well.
2.0.4 Fractional-pressure water injection
It is referred to two sets of water injection pressure system built owing to different water injection pressure of well.
2.0.5 Injectivity index
It is referred to the ratio of the calculation daily water-injection rate determined according to injection imbalance to the daily mean water injection rate determined according to oil-field development requirements.
2.0.6 Water injection pressure
It is referred to the surface pressure required for injecting water into oil layer to maintain reservoir pressure.
2.0.7 Distributing room for water injection
It is referred to the working chamber for receiving water from water-injection station, controlling and distributing to the governed injection well.
2.0.8 Station site
It is the generic terms of various well sites and all kinds of functional stations including the occupied fields and facilities.
2.0.9 Producing well
It is referred to the well used for cutting out petroleum oil.
2.0.10 injection well
It is referred to the well used for injecting some kind of liquid to target stratum with the purpose of improving recovery efficiency and maintaining ground pressure. It can be divided into water injection well and polymer injection well.
2.0.11 well site
It is referred to the place for completing well production process.
2.0.12 well head
It is referred to the section above flanged pipe head of well's surface casing crest.
2.0.13 polymer preparing station
It is referred to the station for proportionally mixing polymer with water and making primary polymer liquor.
2.0.14 polymer injection station
It is referred to the station for transporting primary polymer liquor to injection well after lifting pressure and deliquescing.
2.0.15 water for injection
It is referred to the water complying with water quality requirement for water injection. The quantity is generally equal to sum of injected water, well-flushing water and wasted water.
2.0.16 injected water
It is referred to the water meeting quality requirements of water injection and used for injecting target oil layer during the water injection process.
2.0.17 commingled water injection
It is referred to the technology of leading injected water to oil layer simultaneously through oil pipe of well and annular space of sleeve.
2.0.18 inverse water injection
It is referred to the technology of leading injected water to oil layer through annular space between the oil pipe and sleeve of water injection well.
2.0.19 split water injection
It is referred to the process of respectively leading injected water of different quality to oil layer through different wells in same water injection system.
2.0.20 mixed water injection
It is referred to the process of leading injected water of different quality to oil layer after mixing in same water injection system.
2.0.21 alternate water injection
It is referred to the process of alternatively leading injected water of different quality to oil layer in same water injection system.
2.0.22 intermittent water injection
It is referred to the technology of interruptive leading injected water to oil layer according to requirements of oil production technologies or limit of factors like the equipment and environment.
2.0.23 well-flushing
It is referred to the process of using water to clean and bring deposition in injection well and impurity on side wall so as to improve the hydroscopicity of well. It comprises the following modes: conventional well-flushing and inverse well-flushing.
2.0.24 conventional well-flushing
It is referred to the process of leading well-flushing water into shaft through oil tube and returning to the ground through sleeve.
2.0.25 inverse well-flushing
It is referred to the process of leading well-flushing water into shaft through annular space of sleeve and returning to the ground through oil tube.
2.0.26 well-flushing water
It is referred to the water used for clean-out operation of injection well.
2.0.27 time between well-flushing
It is referred to the interval between two clean-out operations for the same injection well. It shall be expressed with d.
2.0.28 intensity of well-flushing
It is referred to the volume flow rate of well-flushing water in unit time. It shall be expressed with m3/h.
2.0.29 well-flushing time
It is referred to the flush time used for the clean-out operation for once. It shall be expressed with h.
2.0.30 well-flushing waste water
It is referred to the water used for reversing out the ground for the clean-out operation of injection well.
2.0.31 water injecting and distributing house
It is referred to the house composed of one or more sets of water injection pump and high voltage distributing valve group; it is usually designed in small scale.
2.0.32 displacing liquid
It is referred to the liquid used for protecting posterior border of polymer slug (target liquid) from adsorbing and deliquescing.
2.0.33 polymer
It is referred to the natural or compound material polymerized by a great deal simple molecules (single). Polymer used for oilfield water injection is polyacrylamide whose relative molecular weight is 800×104 ~2300× 104. The polymer comprises several states including dry powder, colloid and liquid. Polymer powder is mainly used in oil field.
2.0.34 prepositive liquid
It is referred to the liquid used for protecting anterior border of polymer slug (target liquid) from adsorbing and deliquescing.
2.0.35 primary polymer liquor
It is referred to the high concentration polymer solution dissolved by water. The concentration of general primary polymer liquor is about 5000mg/l.
2.0.36 pipeline marker
It is referred to permanent surface mark set along the pipeline so as to find and search for the accurate position of buried laying pipeline. For instance: mileage pile, turning-point pile, test pile, cross mark and caution mark.
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