Method of well development

 

The invention relates to the oil industry and can be used for development of wells with contaminated bottom area. Down in the tube swab under the liquid level. Raise it with fluid to the wellhead with the message and the dividing line of the annular space. In the beginning put the swab in the tube below the liquid level and raise it together with the liquid to the mouth. Pushpadana of Swabi lower level in the well to equalization of hydrostatic pressure with the reservoir. The swab is then removed. Down in the tube pulsed flow interrupter and install it into the saddle. Pulse flow interrupter is a spring-loaded check valve operating in an unstable mode. Put the swab, dipped it under the liquid level in the tubing and up to the mouth, removing the liquid from the well above the swab. Pushpadana of Swabi reduce the pressure on the bottom below the reservoir, increase the speed of flow of the liquid from the bottom zone to reach its maximum value. This corresponds to a decrease in liquid level in the annulus to the top of formation. About the end of completion is judged by the decrease in the degree of contamination of the fluid and the amount of inflow. ://img.russianpatents.com/img_data/86/869365.gif" border="0">

The invention relates to the oil industry and can be used for development of wells with contaminated bottom area.

There is a method of well development by swabbing (I. M. Ants and A. P. Krylov, "the Exploitation of the oil fields". Gostop-thisdate. - M., 1949, S. 210).

The known method allows you to learn well, but does not provide an acceptable removal of dirt from the bottom zone with a continuous increase in the rate of flow of fluid from the reservoir into the well.

The closest in technical essence and the achieved result to the present invention is a method of oil production (see patent RU NO. 2172390, E 21 IN 43/00, 2001), including the descent of the piston in the tube below the liquid level and lift it together with the fluid to the wellhead with a message in-line space with the annular space and the annular separation space with in-line space tripped flow after reducing the pressure at the bottom hole to the reservoir.

The known method allows you to learn well and make dirt from the bottom zone. However, the method does not adequately cleans the bottom zone, acting on her impulses pressure low frequency.

Technical account more complete cleaning of bottom-hole zone from contamination.

The technical problem is solved in that in the method of development wells, including the descent of the swab in the tubing (tubing), dip the swab under the liquid level in the tubing and the subsequent rise to his mouth with the removal of the well fluid above the swab with the message and the dividing line of the annular space, and reducing the pressure on the bottom of pushpadana of Swabi, the descent of the Svab is carried out in a tubing having a saddle at the lower end, reduce the pressure of pushpadana of Swabi to equalize the pressure on the bottom with the reservoir, remove the swab from the tubing and put them in a pulsed flow interrupter, which represents a spring-loaded check valve operating in an unstable mode, which is mounted on the saddle and thereby alienate pipe and the annulus, down in the tubing swab and dipped it under the liquid level in the tubing, and then raised to the mouth, removing from the well fluid above the swab, reduce the pressure on the bottom is less than the reservoir pushpadana of Swabi, increasing the rate of flow of liquid from the bottom zone to reach its maximum value, the corresponding decrease in the liquid level in the annular space up to the roof of p is/p>

Studies have shown that the descent of the swab in the tubing, with the saddle at the lower end, the lower pressure pushpadana of Swabi to equalize the pressure on the bottom with the reservoir, relieves back pressure on the formation and subsequent extraction of the swab from the tubing and run in a pulsed breaker stream representing a spring-loaded check valve operating in an unstable mode, installed on the saddle and separation thereby pipeline and annular spaces, the descent into the tubing of the swab and dip it under the liquid level in the tubing, and then climb up to the mouth, removing from the well fluid, above the swab, reducing the pressure on the bottom is less than the reservoir pushpadana of Swabi, increasing the rate of flow of liquid from the bottom zone to reach its maximum value, corresponding to a decrease of the liquid level in the annulus to the top of the reservoir, provides the creation of a depression in the reservoir and the inflow of fluid into the borehole while exposed to the bottom zone of the pulse pressure increased, relative to the known method, frequency, thus contributing to a better separation of foreign particles from the pore walls and greater removal in Swinoujscie bottom-hole zone from contamination and to increase the efficiency of development.

The drawing shows a diagram of the method of well development.

Well 1 posted by tubing 2, the lower end of which has a seat 3, on which is installed a flow interrupter 4. Inside the pipes on the rope 5 is suspended from Swabi 6.

The method is implemented as follows. First swabbing carried out without the impulse of the flow interrupter. Swabbing of wells portions removed sadavoy liquid, reducing the back pressure on the producing formation. For this swab dipped below the level of the liquid in the pipes, and then raise it to the mouth, removing from the well fluid above the swab. When the upward movement followed by a swab from the annulus enters a new portion of the liquid, filling the vacated volume. This reduces the liquid level in the well and, accordingly, the back pressure on the formation.

When the result of several such operations, the pressure of the liquid column in the well is equal Plast, pipe down pulse flow interrupter 4 and place it on the seat 3. Then the swab is immersed below the liquid level in the pipe, and then raise it to the mouth, removing from the well fluid above the swab.

When driving Vorpal new portion of the liquid, filling of vacant volume. When the liquid level in the annulus is reduced and the pressure at the bottom hole becomes smaller than the reservoir, starts the flow of liquid from the bottom-hole formation zone. At this time, due to the pulsating nature of the fluid is rapidly removed from the bottom zone of the largest dirt particles, creating a large hydraulic resistance in the pore channels.

The operation of customtheme of the swab, repeat several times. The level of liquid in the annulus decreases, increases depression on the formation and increases the speed of flow of the liquid from the bottom zone, reaching a maximum value at the lower level to the top of formation. At this time, by increasing the speed of flow of the liquid and the pulsating nature of its movement, there is intense removal of smaller particles of dirt from the bottom zone, and increases the radius of carryover contamination. About the end of completion is judged by the decrease in the degree of contamination of the liquid and also the largest intake or absorption, comparing it with the measurements to kill.

The proposed method of descent of the swab in the tubing, with the saddle at the lower end, with the pressure on the formation. Further removing the swab from the tubing and run in a pulsed breaker stream representing a spring-loaded check valve operating in an unstable mode, which is set on the saddle and thereby disconnecting pipe and the annulus, the descent into the tubing of the swab and dip it under the liquid level in the tubing, and then climb up to the mouth, removing from the well fluid above the swab, provides a flow of fluid from the reservoir into the well and the pulsating nature of its movement, due to this more complete cleaning of the bottom zone of contamination. The reduction of pressure on the bottom is less than the reservoir pushpadana of Swabi, increases in the case of pulsating character of the movement speed of the fluid flowing from the bottom zone to reach its maximum value, corresponding to a decrease of the liquid level in the annulus to the top of the reservoir, allowing it to provide a more thorough cleaning of bottom-hole zone from contamination and increasing the efficiency of utilization.

A specific example. Spend the development of well perforation interval 1200-1205 m, reservoir pressure 7 MPa, filled with process liquid with a specific gravity of 1 g/cm3up to 200 m from the mouth. Pump-kompresory pipes on the rope down the swab and swabbing reduce the liquid level in the well up to 500 m, the pressure at the bottom hole becomes equal Plast. The swab is removed from the pipe and down pulse interrupter stream representing a spring-loaded check valve operating in an unstable mode, and set it on the saddle. In tubes down the swab and swabbing reduce the level in the annulus. When using the pulse interrupter flow generated pulses of fluid pressure with amplitude of 1.5-2.0 MPa and a frequency of 20-25 Hz, which affect the bottomhole zone.

The application of the proposed method will give you more clear bottom zone.

Claims

Method of well development, including the descent of the swab in the tubing (tubing), dip the swab under the liquid level in the tubing and the subsequent rise to his mouth with the removal of the well fluid above the swab with the message and the dividing line of the annular space, and reducing the pressure on the bottom of chute-the rise of Swabi, characterized in that the descent of the Svab is carried out in a tubing having a saddle at the lower end, decrease the pressure of the chute-the rise of the swab to equalize the pressure on the bottom with the reservoir, remove the swab from the tubing and put in either the Yves mode, which is mounted on the saddle and thereby alienate pipe and the annulus, down in the tubing swab and dipped it under the liquid level in the tubing, and then raised to the mouth, removing from the well fluid above the swab, reduce the pressure on the bottom is less than the reservoir chute-the rise of Swabi, increasing the rate of flow of liquid from the bottom zone to reach its maximum value, corresponding to a decrease of the liquid level in the annulus to the top of formation, and about the end of completion is judged by the decrease in the degree of contamination of the fluid and the size of the influx.



 

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