RU57343U1 - DEVICE FOR CLEANING WELL BORE - Google Patents

Abstract

The proposal relates to the oil industry and can be used to clean the bottom of oil, gas and injection wells after drilling, as well as for ongoing and major repairs of wells. The device consists of a hollow body with a guide sleeve in its upper part, and also sealed by means of O-rings with the possibility of axial movement downward through the guide sleeve into the hollow body, a hollow plug plugged from the lower end. The plunger is equipped in the side walls, brought into the hollow body by radial through holes. At the lower end of the hollow body, a fitting with an adjustable bore diameter is installed, which allows you to adjust the rate of entry of sludge, dirt and sand from the bottom of the well during its cleaning. A suction valve is installed at the lower end of the fitting by means of a sub. A nozzle with a tapered lower end is installed under the inlet valve. In the transport position, the plunger is fixed relative to the guide sleeve of the hollow body by a shear element. The proposed device allows you to quite efficiently clean the bottom of the well due to the optimal selection of the bore diameter of the nozzle depending on the state of the bottom, having previously gone deep into the bottom, and this eliminates further repeated work on cleaning the bottom of the well, and, as a result, saves money. 1 ill. for 1 liter

Description

The proposal relates to the oil industry and can be used to clean the bottom of oil, gas and injection wells after drilling, as well as for ongoing and major repairs of wells.

A device for cleaning the bottom of a well from sand plugs (Lavrushko PN Underground repair of a well. M., Nedra, 1968, p. 281-282, Fig. 149), which consists of a hollow body with a guide sleeve in its upper part, a piston with a rod mounted on the lower end of the intake valve body and placed on the spring rod. For loosening sand plugs at the end of the device, an additional baking powder tool is provided, for example, made in the form of peaks with a conical head, under which a landing saddle is made in the lower part of the housing. In the piston body of the device, longitudinal bypass channels are made for fluid flow from the lower part of the device (from under the piston) to the upper part. From the upper end of the piston, a cap is freely installed on the rod to block the channels in the piston, and for depreciation during the stroke of the rod to the highest and lowest positions, springs are installed on the rod in a free (unloaded) state: one outside the housing and the other in the housing. At the upper end of the device there is an eyelet for attaching the tartar rope, on which this device descends into the well for work and rises to the surface.

The disadvantages of this device are:

- firstly, the complexity of the design, due to the large number of nodes and parts;

- secondly, the presence of longitudinal bypass channels in the body of the piston and the cover for their overlapping due to clogging with sand does not provide tightness during operation, which reduces the reliability of the device.

The closest in technical essence to the proposed one is a device for cleaning the bottom of the well (see RF patent for utility model No. 46032, MKI 7 E 21 27/00 publ. In Bulletin No. 16 dated 06/10/2005), including a hollow body with a guide sleeve in its upper part, sealed with axial movement downward through the guide sleeve into the housing, a hollow plug plugged from the lower end equipped in the side walls, brought into the lower case by radial through holes, and on the outer surface, which is outside orpusa at the top, an annular collar mounted on the lower end

the casing is a receiving valve, a packer seal, while the casing is a casing of the receiving valve, and a packer seal is installed between the upper end of the guide sleeve of the casing and the annular collar of the plunger.

The disadvantages of this device are:

- firstly, before cleaning the bottom of the well, the hollow body rests with the bottom end against the bottom to be cleaned and if the bottom is “hard”, it is very difficult to loosen it, which very sharply reduces the ingress of sand, sludge, and dirt from the bottom of the well,

- secondly, if the face is on the contrary “soft”, then due to the sharp (unregulated) inflow of sand, sludge and dirt into the hollow body, the through radial holes may become clogged. All of the above reduces the efficiency of the device

The objective of the utility model is to increase the efficiency of cleaning the bottom of the well without complicating the technology of using the device.

The specified technical problem is solved by the proposed device for cleaning the bottom of the well, including a hollow body with a guide sleeve in its upper part, hermetically wound with the possibility of axial movement downward through the guide sleeve into the body, a hollow plunger, muffled from the bottom end, equipped in the side walls, wound inside the hollow body radial through holes, intake valve.

What is new is that between the hollow body and the receiving valve a fitting with an adjustable bore diameter is installed, and a pipe with a beveled lower end is installed under the receiving valve, while in the transport position the plunger is fixed relative to the guide sleeve of the hollow body by a shear element.

The figure shows the proposed device in longitudinal section in the transport position.

The device consists of a hollow body 1 with a guide sleeve 2 in its upper part, as well as hermetically sealed by means of sealing rings 3 with the possibility of axial movement downward through the guide sleeve 2 into the hollow body 1, a hollow plunger muffled from the bottom end 4. The plunger 4 is equipped in the side walls inserted inside the hollow body 1 by radial through holes 5. At the lower end of the hollow body 1 there is a fitting 6 with an adjustable bore diameter - d of a _fitting that allows you to adjust the flow rate ma, mud and sand from the bottom of the well during its cleaning. At the lower end of the fitting 6 by means of a sub 7, a receiving valve 8 is installed, under which a pipe 9 with

beveled lower end 10. In the transport position, the plunger 4 is fixed relative to the guide sleeve 2 of the hollow body 1 with a shear element 11.

The device operates as follows.

To clean the bottom of the well, the upper part of the plunger 4 of the device by means of the sleeve 12 is fixed at the lower end of the tubing string 13. After that, the device on the tubing string 13 is lowered into the well until it is pore to the bottom of the well (not shown in Fig.). As soon as the pipe 9 with a beveled end 10 goes deeper into the bottom of the well, loosening the sand plug from above, the device will stop its downward movement. Next, the tubing string 13 is unloaded onto the plunger 4, and the shear element 11 is first destroyed. The tubing string 13 is continued to be unloaded, while the plunger 4 continues to move downward relative to the hollow body 1, at some point, the radial through holes 5 of the plunger 4 come out of the guide sleeve 2 of the hollow case 1, the inner cavity 14 of the hollow body 1 through the radial through holes 5 and the inner cavity 15 of the plunger 4 will communicate with the inner space of the tubing string 13 and further with the atmosphere.

Due to the pressure difference in the tubing string 13 and at the bottom of the well, the liquid, together with sand, sludge and dirt, through the opening intake valve 8 through the nozzle 6 with an adjustable bore diameter - d _nozzle , which allows you to adjust the rate of entry of sludge, dirt and sand enters the inner cavity 14 of the hollow body 1 and then through the radial holes 5 of the plunger 4 into the inner cavity 15 of the plunger 4 and then into the inner cavity of the tubing string 13.

Thus, the process of cleaning the bottom of the well occurs, and the larger the diameter of the _nozzle is d, the greater the rate of entry of sludge, dirt and sand from the bottom of the well into the device, and the less time is required to clean the bottom of the well. On the contrary, the smaller the bore diameter - d of the _nozzle , the lower the rate of entry of sludge, dirt and sand from the bottom of the well into the device, and the more time it takes to clean the bottom of the well. Thus, by changing the bore diameter - d of the _nozzle depending on the state of the bottom, it is possible to achieve the most effective cleaning of the bottom of the well.

After cleaning the bottom of the well, the tubing string 13 is raised to the surface.

The proposed device allows you to quite effectively clean the bottom of the well due to the optimal selection of the bore diameter of the nozzle depending on the state of the bottom, having previously gone deep into the bottom, and this eliminates further repeated work on cleaning the bottom of the well, and, as a result, saves money.

Claims (1)

Device for cleaning the bottom of the well, including a hollow body with a guide sleeve in its upper part, hermetically sealed with the possibility of axial movement downward through the guide sleeve into the body, a hollow plug plugged from the bottom end, equipped in the side walls with radial through holes introduced into the hollow body, receiving a valve, characterized in that between the hollow body and the receiving valve a fitting with an adjustable bore diameter is installed, and a pipe with beveled lower end, while in transport position the plunger is fixed relative to the guide sleeve of the hollow body by a shear element.