RU95111231A - Underground equipment for well operation - Google Patents

Abstract

FIELD: underground equipment of wells for production of oil and gas. SUBSTANCE: equipment includes accommodated in flow string cylindrical bushing rigidly connected by its lower end to sleeve. Connected to sleeve lower part is holder and bottom with central axial channel closed by ball shutoff member. Holder and bottom are interconnected by shearing member. case is located atop the bushing and has axial flushing channels, and central axial channel for arrangement of tubing. Case has internal groove, and bushing has external groove for receiving locking member in the form of split spring ring. Accommodated inside case and bushing is piston reciprocating in them. Installed above coupling is case and installed under coupling is piston which has additional axial channels for installation of inhibition and circulation valves. Height of internal part of case exceeds the distance from piston lower end to upper end of coupling. Diameter of central axial channel of case is smaller than outer diameter of coupling, but is larger than outer diameter of pipe. Sleeve is made of plastic material and coated with a layer of sealing material. Lowered on pipe string are cylindrical bushing with sleeve, holder, and bottom into flow string to the calculated depth. Built-up in sleeve is excessive hydraulic pressure. Sleeve undergoes deformation in radial direction and is tightly pressed to walls of flow string. Then shearing members fail and bottom with shutoff member is lowered onto well bottom. Pipe string is disconnected from bushing and lifted to wellhead where connected to them is piston on which case is moved upon. The latter together with piston is lowered into flow string, case goes down on bushing and locked on it with the aid of locking member. Piston is brought into bushing. Then wellhead is provided with setup and necessary subsequent operations, such as flushing, geophysical investigation, perforation work, completion and putting into service. EFFECT: higher operating reliability. 7 cl, 2 dwg

Claims (1)

1. Underground equipment for the operation of wells, including a tubing string installed in the production casing, connected by couplings, equipped with a packer with a central axial channel and sealing elements placed on the lateral outer surface, circulation and inhibitor valves, as well as a telescopic compensator for length changes tubing string, characterized in that it is provided with a cylindrical sleeve with stepped inner and outer surfaces, a sleeve with a ferrule, a bottom and a casing in the form of a glass with a stepped inner surface, the packer being made in the form of a piston with additional axial channels to accommodate inhibitor and circulation valves and has the possibility of reciprocating movement inside the casing and sleeve , which is made in the upper part with an external annular groove for placement of a fixing element in it, in the lower part with an internal connecting thread to provide and lowering the equipment into the well, and the lower end of the sleeve is rigidly connected to the upper end of the sleeve, the lower end of which is connected to the holder, the casing being made with a central axial channel for accommodating the tubing, axial flushing channels and with an inner annular groove in the lower parts for accommodating the fixing element, the latter being made in the form of a split spring ring, and the clip using shear elements is connected to the bottom, which is made with a conical inner surface and has a trailing axial channel blocked by a spherical locking element, the piston mounted below the coupling of the tubing and the casing above the coupling, while the height of the inner part of the casing exceeds the distance from the lower end of the piston to the upper end of the coupling located above it, and the diameter of the central axial the casing channel is smaller than the outer diameter of the sleeve, but larger than the outer diameter of the tubing.  2. Underground equipment for the operation of wells according to claim 1, characterized in that it is equipped with a stopper installed on the tubing above the casing in the lowermost position of the latter, and made in the form of a clamp made of rubber rings on the inside.  3. Underground equipment for the operation of wells according to paragraphs. 1 and 2, characterized in that the sleeve, the casing and the cage are equipped with centering elements mounted on their outer surfaces. 4. Underground equipment for the operation of wells according to paragraphs. 1-3, characterized in that the sleeve is made of plastic material (for example, alloys of aluminum, copper, mild steel, etc.)
5. Underground equipment for the operation of wells according to paragraphs. 1-4, characterized in that the sleeve in the transport position is made deformed in the radial direction along the entire length. 6. Underground equipment for the operation of wells according to paragraphs. 1-5, characterized in that the sleeve on the outside is covered with a layer of sealing material (for example, rubber, plastic, lead, copper, etc.)
7. Underground equipment for the operation of wells according to paragraphs. 1-6, characterized in that the thickness of the layer of sealing material changes smoothly, having a minimum value in the middle part of the sleeve, the maximum - at its ends.