A method for indoor determination of salinity of injected water from low-salinity water flooding in carbonate reservoirs
A technology for carbonate rock reservoirs and carbonate rocks, which is applied in earthwork drilling, wellbore/well parts, production fluids, etc., can solve problems such as time-consuming and labor-intensive, dead oil areas, and difficulty in ensuring accuracy, and achieve Avoid misleading human experience, convenient and quick operation, and accurate results
Active Publication Date: 2021-02-26
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology
[0004] In the process of reservoir development, using water with unsuitable salinity for displacement will not only result in poor water flooding effect, but may even cause the deterioration of reservoir fluid seepage environment and form dead oil zones, so that part of the crude oil can never be displaced, reducing the Overall reservoir recovery and economics
At present, in the water flooding construction of carbonate reservoirs, the salinity of water flooding is usually determined according to the experience of the construction personnel. There are obvious interferences from personal subjective factors, and the accuracy is difficult to guarantee. The wettability measurement experiment under water flooding with different salinities is time-consuming and labor-intensive
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[0049]according toFigure 6The flow chart of the implementation steps of the present invention is shown to carry out the method of optimizing the salinity of low-salinity water flooding injected water in carbonate reservoirs, and the specific steps are as follows:
[0050]1) Select multiple groups of different carbonate rock fragments, and measure their calcite / dolomite content separately, and obtain multiple rock fragments from each group of carbonate rocks of the same composition;
[0051]2) Washing, drying, polishing and vacuuming the rock slices in sequence, and then pressurize and saturate the rock slices with formation water;
[0052]3) Using multiple groups of salt water with different salinities, the wetting angle of each rock slice of the same mineral composition in each group is measured by the bubble method to obtain the initial wetting angle and the final wetting angle. In this embodiment, the salinity and ion composition of the brine are shown in Table 1. When using salt water to...
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The invention discloses a method for indoors measuring injected water salinity of carbonate reservoir low-salinity water drive. The method comprises following steps of measuring content of calcite ordolomite in multiple sets of different carbonate rock, and the salinity of multiple sets of saline with different kinds of salinity; in the multiple sets of saline with different kinds of salinity, measuring the initial wetting angle and the final wetting angle of each set of same carbonate rock and an oil drop, and obtaining the maximum variation of the wetting angle; applying a least square method to fit out the functional relation between the maximum variation of the wetting angle along with changes of carbonate rock components and saline salinity; and measuring the content of calcite or dolomite in target carbonate reservoir rock, and according to the above functional relation, calculating the salinity value when the maximum variation of the wetting angle is the maximum value. The salinity value is the injected water salinity suitable for target carbonate reservoir low-salinity water drive. The method can conveniently, rapidly, and accurately obtain the optimal salinity of the carbonate target reservoir water drive development.
Description
Technical field[0001]The invention relates to a method for indoor determination of the salinity of low-salinity water flooding injected water in carbonate reservoirs, which belongs to the field of oil field development.Background technique[0002]Rock wettability is the result of the interaction between rock minerals and reservoir fluids, and is one of the basic reservoir parameters. When the formation temperature is constant, the wettability of the rock is mainly affected by the composition of crude oil and formation water and the composition of the reservoir rock, and determines the original microscopic distribution of the reservoir fluid in the rock pores, and also determines the formation fluid injection The difficulty of seepage and oil displacement efficiency are of great significance in improving the effect of oilfield development and selecting methods to enhance oil recovery. In the process of water flooding, hydrophilic rocks will cause the automatic inhalation of injected wa...
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IPC IPC(8): E21B43/20E21B49/00
CPCE21B43/20E21B49/00
Inventor 李长勇邱凌刘月田皮建苏文博唐莎莎蒋百召薛亮张宇陈培元柴汝宽王云鹏
Owner CHINA NAT OFFSHORE OIL CORP