The method of hydrodynamic investigations of horizontal wells

 

The invention relates to the oil industry and can be used for hydrodynamic studies of horizontal wells. The technical result of the invention is to simplify the hydrodynamic studies of horizontal wells and increase their reliability. In the horizontal part of the well on the tubing pipe place the container inside of which is placed deep stand alone devices. Placement on the column tubing Autonomous underlying instruments produce respectively geophysical characteristics plots deposits. Containers represent the sections of the pipe are cut slit. In string of tubing in the vertical part of the borehole place the pump below which is placed a filter made of perforated pipe section of the column tubing. Through cracks in the container and through the filter shall receive the downhole fluid to the pump intake through the column tubing and microbio. Excitement wells produce an installed pump. The interpretation of the data is carried out according computational algorithm. 1 Il.

The known method of hydrodynamic investigations of horizontal wells, including the placement of instrumentation at the end of the column flexible pipes, inside of which is omitted geophysical cable, pushing the flexible pipe in a horizontal wellbore, pumping cavity to the flexible pipes or fluid and gas research (Osadchy C. M., Telescop C. M. the State and prospects of development of technologies for investigation of horizontal wells during testing and operation/Scientific and technical Bulletin of “Carotenic”. 2001, S. 107-19).

The disadvantage of this method is the complexity of the excitation wells in the research process.

Closest to the invention to the technical essence is a way of hydrodynamic investigations of horizontal wells, including the determination of the parameters of the curve pressure restoration and interpretation of the results of hydrodynamic research-based methods of regulation (Muslimov R. H. and others interpretation of the results of hydrodynamic investigations of horizontal wells/Oil industry. No. 10, 2002, S. 76, 77 prototype).

The known method does not allow to artificially stir well and bring it to the steady-state mode, which reduces DOS is>p>The objective of the invention is to simplify the hydrodynamic studies of horizontal wells and increase their confidence.

The task is solved in that in the method of hydrodynamic investigations of horizontal wells, including the stimulation of the well, measured parameters with the help of underlying instruments, available in horizontal sections with different geophysical characteristics, and processing of measurement results according to the invention, before carrying out research on the column tubing place the containers that represent the sections of the pipe are cut slit, inside containers set deep stand alone devices, omit the column tubing into the hole in the vertical part of the well in the tubing pipe install pump rod, below which is placed a filter made of perforated pipe section of the column tubing, through cracks in the container and through the filter shall receive the downhole fluid to the pump intake through the column tubing and microbio, in this case the excitation of the borehole produced by the same pump.

The invention

Currently, it is lnyh wells. When processing data, which are obtained during the well test, a so-called inverse problem of filtering. It can be formulated as the problem of determining the geometric and dynamic characteristics of the layer at a known pressure changes and the rate of filtration of fluid at certain points of the layer.

On the basis of the regularization methods developed computational algorithm for the interpretation of the recovery curves (fall) pressure in the horizontal well taken concurrently by multiple gauges installed on different parts of the horizontal part of the trunk. It allows us to estimate the heterogeneity of the flow parameters along the length of the horizontal portion of the horizontal well.

To solve this problem we use the following approach: minimize the standard deviation of the calculated bottomhole pressures from observable

wherei(t) is observed; pi(t) is calculated pressure in the locations of the devices at time t;

N is the number of installed devices;

k - coefficient of permeability;

- elm who is in the class of piecewise constant functions. Minimization of the standard deviation of J is based on optimal control methods. The distribution of the pressure field in a formation penetrated by a horizontal well, is the finite difference method.

However, existing tools and methods are complicated and not reliable enough. The objective of the invention is to simplify the hydrodynamic studies of horizontal wells and increase their confidence.

The problem is solved by the following set of actions.

Before conducting research in string of tubing place the containers that represent the sections of the pipe are cut slit. Inside containers set deep stand alone devices. Omit the column tubing in the well. In the vertical part of the well in the tubing pipe install pump rod, below which is placed a filter made of perforated pipe section of the column tubing. Through cracks in the container and the perforated filter shall receive the downhole fluid to the pump intake from the column tubing and the annulus. Spend the excitation of the well sucker-rod pump, metering couples who perform, and processing of measurement results.

Through cracks in the container and the perforated filter inner space of the column tubing and annulus are reported in the locations of underlying instruments. The flow of the well fluid to the pump intake occurs through the column tubing and the annular space.

Excitement wells produce an installed pump.

The invention is illustrated in Fig.

In Fig. presents the horizontal portion of the well 1, which lowered the column tubing 2 to a pump 3, a filter 4 and the container 5 is placed in them deep Autonomous devices 6. Placement on the string of tubing 2 containers 5 and, accordingly, the depth of the Autonomous devices produced in accordance with the assumptions of permeability zones of the reservoir, made in accordance with the preliminary geophysical exploration wells. The filter is a perforated section of pipe with a length of 1.5 m as the depth of Autonomous devices use a standalone gauges-thermometers, such as AMT 06. As the pump using pump rod, for example GW-43. The container represents the study of horizontal oil wells No. 1947 Sirenesque field.

The well has a vertical long section 1102 m and a horizontal segment with a length of 310 m Horizontal section of the well is made without the casing. In the well is lowered column tubing with a diameter of 73 mm In the vertical part of the well in the tubing pipes placed pump rod brand NGV-43, column connected rods with machine-rocking at the wellhead. Lower sucker rod pumps posted by filter, which is perforated section of pipe from the column tubing with a length of 1.5 m On the horizontal section of the column tubing in three places set containers, representing part of the pipe from the column tubing on which the cut slit. Inside the containers are placed offline depth instrument gauges-thermometers type AMT-06. Containers and instruments are located in areas well with different permeability of the reservoir, the first at a distance of 40 m, the second - 230 m and the third is 300 m from the beginning of the horizontal section of the well. The collector of the productive formation is porous and fractured. The average saturation - 0,66. Oil viscosity at reservoir conditions - 30,6 MPa·C.

Initiate a subsurface pump and who is ut. Deep devices are constantly measuring pressure and temperature. Stop the hole and raise the column tubing to the surface. Take readings of the downhole devices. Process the measurement results of the data underlying computing devices according to the algorithm in recovery mode pressure after stopping well. Build recovery curve pressure measurement results data downhole tools. Based on the input data to calculate the series recovery curves of pressure and the method of successive approximation receive the calculated curve with the values of pressure differing from the pressure values on the curve from the measured data, not more than 10-6. This calculated curve determine the estimated permeability and divide it into the oil viscosity, receiving the mobility of the formation fluid at this point well. The result determines that the area of the first device, the mobility of the formation fluid is equal 0,00274 μm2/MPa·with, in the area of the second device - 0,00255 μm2/MPa·and in the area of the third unit - 0,00071 μm2/MPa·C. based On these data conclude that in zones 1 and 2 of the device, where mobility is high, there in the water corroborate data thermometry. Take into account the temperature of the formation fluid at the beginning of the entry mode and at the end of the exit to the mode of operation of the well after the pump start. Determine the temperature difference at the end and at the beginning of the entry mode. Establish that in the area of the first device, the temperature difference is equal to 0.2°C, in the area of the second device is equal to 0,33°C and in the area of the third unit to 0.03°C. these temperature measurements confirm the conclusion reservoir permeability in these zones.

The application of the proposed method will simplify hydrodynamic studies of horizontal wells and to increase their reliability.

Claims

The method of hydrodynamic investigations of horizontal wells, including the stimulation of the well, measured parameters with the help of underlying instruments, disposable on a horizontal section of the well with different geophysical characteristics, and processing of measurement results, wherein before carrying out research on the column tubing place the containers that represent the sections of the pipe are cut slit, inside containers set deep stand alone devices, omit the column tubing in SC is the same place which the filter is made of perforated pipe section of the column tubing, through cracks in the container and through the filter shall receive the downhole fluid to the pump intake through the column tubing and microbio, in this case the excitation of the borehole produced by the same pump.



 

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