RU2139406C1 - Device for treatment of bed - Google Patents

Abstract

FIELD: oil production industry. SUBSTANCE: device has body with cylinder lowered into well by string of pipes. Installed in body are anvil and plunger acting as striker. Plunger actuator is made in the form of piston with tie-rod and coupling mechanism which in its upper position interacts with stop. For movement of piston under action of pressure from string of pipes, lower partition and upper partition are installed in body. Inserted through lower partition is tie-rod, and inserted through upper partition is hollow rod. Installed on hollow rod is spool valve. Spool valve interacting with stop in lower position, and interacting in upper position with upper partition ensures connection of above-piston space of body through passage to space of pipes or to above-piston space and further through openings to annular space. Application of aforesaid embodiment of device allows for actuation of device by pressure delivered into string of pipes by which device is lowered into well. EFFECT: higher efficiency. 1 cl, 1 dwg

Description

 The invention relates to the field of exploitation of oil fields and can be used for pulsed impact on the reservoir.

 A device is known for impact on a formation containing a string of pipes lowered into a well, in which an anvil and a plunger (striker) forming an airtight chamber are installed, and a plunger drive made in the form of a piston installed in the extension of the column with a coupling mechanism for moving the plunger to its highest position [ 1].

 A disadvantage of the known device is that to bring it into action it is necessary to maintain a high pressure in the annulus.

 The technical challenge facing the invention is to enable the device to be actuated by the pressure supplied to the string of pipes on which it is lowered into the well.

 To solve this problem, in a device for acting on a formation containing a body with a cylinder lowered into the well on a pipe string, a plunger and an anvil placed in the cylinder, and a plunger hydraulic actuator made in the form of a piston with a rod and an engagement mechanism with the plunger, additionally in the column under and a lower baffle, through which the rod is passed, and an upper baffle, through which a hollow rod connected to the piston, the cavity of which communicates with the cavity the bows and the sub-piston zone, while in the supra-piston zone communicating with the annulus, a spool is installed on the hollow stem for alternately connecting the sub-piston zone through the cavity of the rod to the cavity of the pipe string or to the supra-piston zone.

 The device can be equipped with a packer for blocking the annulus and a channel communicating the cavity of the pipe string with the sub-packer zone of the annulus, while the supraperpendicular and supra-plunger zones of the body communicate with the supra-packer zone of the annulus.

 The drawing shows a diagram of a device for stimulating the formation.

 The housing 1 of the device is installed in the borehole 2 on the pipe string 3. In the lower part of the housing in the cylinder 4 there is a plunger 5 and an anvil 6 forming an airtight chamber with cylinder walls.

 In the housing 1 there is a piston 7 with a hollow rod 9 passed through the upper baffle 8 and a rod 11 passed through the lower baffle 10, connected with the coupling mechanism 12. A spool 13 is installed on the rod 9.

 In the position shown in the drawing, the pressure from the column 3 along the rod 9 through the spool 13 and the channel in the piston 7 is supplied to the sub-piston zone bounded by the baffle 10, while the piston 7 moves upward, and the liquid from the supra-piston zone bounded by the upper baffle 8 is forced out into the annulus through the windows 15 in the housing 1. The plunger 5, captured by the coupling mechanism 12, is pulled up by a rod 11 and creates a vacuum (vacuum) in the cylinder 4.

 In the extreme upper position, the spool 13 abuts against the partition 8 and switches. At the same time, the hitching mechanism 12 contacts the stop 16 and releases the fishing head of the plunger 5. Due to the rarefaction in the cylinder 4 and the pressure in the body cavity 1, the plunger 5 rushes down and hits the anvil 6, creating a high-pressure pulse in the liquid, which transforms into damped vibrations transmitted to productive layer. At the same time, a rarefaction zone arises above the plunger in the body cavity and, due to filling the body with liquid through the windows 17, an additional implosive effect on the formation is created.

 When the piston switches down the piston under pressure from the column 3, which creates a force on the rod 9, moves down, and the liquid from the subpiston zone through the spool 13 enters the supra-piston zone. In the lowermost position of the piston, the coupling mechanism captures the head of the plunger 7, and the spool 13 is in contact with the stop 18 and switches to its original upper position. The cycle repeats.

 The device can be made with a packer 19 and a bypass channel 20, communicating the cavity of the column 3 with a sub-packer zone of the well, and windows 15 and 16 must communicate with the over-packer zone. In this case, the pressure in the sub-packer zone increases, which leads to an increase in the stimulation energy.

Sourse of information:
1. RF patent 2106471, MKI ⁶ E 21 B 28/00, 43/25, 03/10/98

Claims (2)

 1. A device for influencing the formation, containing a housing with a cylinder being lowered into the well on the pipe string, a plunger and an anvil placed in the cylinder and a plunger hydraulic actuator made in the form of a piston with a rod and a coupling mechanism with a plunger, characterized in that in and under the column the hydraulic actuator piston is installed forming the sub- and supra-piston zones, the lower partition, through which the rod is passed, and the upper partition, through which the hollow rod connected to the piston is passed, the cavity of which communicates with the column cavity and the piston zone, while in the area above the piston, in communication with the annulus, the hollow valve stem mounted for alternately connecting the subpiston zone through the stem cavity to cavity or to the pipe string above the piston area.  2. The device according to claim 1, characterized in that it is equipped with a packer for closing the annulus and a channel communicating the cavity of the pipe string with the sub-packer zone of the annulus, while the supra-piston and supra-plunger zones of the body communicate with the super-packer zone of the annulus.