SU1214914A1 - Apparatus for hydrodynamic testing of well - Google Patents

Description

The invention relates to hydrodynamic studies of oil and gas wells and can be used to identify the hydrodynamic connection between the formations in one well.

The purpose of the invention is improving the reliability of the device.

FIG. 1 shows schematically the proposed device for hydrodynamic well studies} in FIG. 2 are diagrams of pressure variations in various well sections.

The drill pipes 1 are lowered into the casing 2 and are equipped with circulating 3 and 4-valve shutoff valves. The reservoir is insulated using the upper packer 5 and the lower one, which consists of two rubber packer elements 6 and 7, the latter are interconnected by a sub 8 in which there is a damper chamber 9 with a pressure gauge 10 installed in it and a channel 11 for the flow of fluid from the lower packer to damping chamber. The damper chamber when the device is lowered into the well is filled with air. A filter 12 with a pressure gauge 13 is located in the inter-packer zone. In the drill pipes a pressure gauge 14 is installed above the upper packer. A pressure gauge 16 is installed in the shank 15 below the lower packer.

FIG. Figure 2 shows the establishment of a hydrodynamic connection between the layers, against which the pressure gauges 13 and 16 are located, with a - the pressure curve above the upper packer 8 - the pressure curve in the interpacker zone; & - pressure curve in the lower packer; d - curve of pressure in the area of the tail; 3 - pressure curve in the shank area in the absence of hydrodynamic coupling.

The device works as follows.

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The device is lowered into the well. In this case, the rubber packer elements 7 and 6 are sequentially triggered. When element 6 out of 5 is triggered, the excess of liquid through channel 11 passes to the damper chamber 9. Then the upper packer is activated. The pressure gauge 14 records the pressure of the liquid column as it descends and in the process.

10 tests in drill pipe. The reservoir tester creates a depression on the reservoir against which the filter is installed. Pressure gauges 10, 13, 16 record the pressure changes that occur with this. If there is no hydrodynamic connection between the formations, then the pressure curve recorded by the pressure gauge 16 is a straight line parallel to the horizontal axis (Fig. 2, curve 20). If such a connection is present, the pressure curve of the pressure gauge 16 is shaped like a pressure gauge 13 (Fig. 2, curves S and t), the tightness of the lower packer is proved

25 of the pressure gauge of the pressure gauge 10. The pressure recorded by the pressure gauge 10 must remain constant during the entire test time (Fig. 2, curve K).

30 Execution of the lower packer in the form of two rubber packer elements interconnected by a sub with a damper chamber in which the fourth gauge is installed, and there is a channel for the flow of fluid from the cavity between the two rubber packer elements into the damper chamber to ensure reliable separation of the layers with simultaneous control of packer quality. This allows to obtain reliable results, on the basis of which it is unambiguously onpei-sharing the presence of hydrodynamic communication between the layers, predict

5 watering of productive layers and water. time to take action against flooding.

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FIG. 2

VNII1SH Order 892/46 Circulation 548 Subscription Branch PPG Patent, Uzhgorod, ul, Proektna. four

Claims (1)

DEVICE FOR HYDRODYNAMIC RESEARCHES OF WELLS, containing upper and lower packers, three pressure gauges, a filter valve system and a liner, characterized in that, in order to increase reliability in operation, it is equipped with an additional pressure gauge, and the lower packer is made in the form of two rubber packers; elements interconnected by the sub with the channel and the damper chamber, the latter having an additional pressure gauge, the cavity between the two rubber packer elements is connected via the channel to the damper chamber. ϊ