RU190415U1 - EASILABLE BORROWING EQUIPMENT LOW COLUMN - Google Patents

Abstract

The utility model relates to the oil and gas industry, namely to equip the bottom of the casing string, which can be used to reliably separate the tubular and annular space when attaching boreholes, cleaning the inner surface of the casing string from the mudcake, separating the cement (cement) solution. The equipment of the bottom of the casing, including a flush plug and a stop ring for reliable separation of the tubular and annular space when attaching boreholes, cleaning the inner surface of the casing string from the mudcake, separating cement (cement) mortar, made of a composite material (caprolon), ensures easy drilling of the tooling, thereby speeding up the process of drilling the tooling after cementing the column and minimizing the wear of the weapon of the drilling tool due to the absence s metal elements in the design.

Description

The technical field to which the utility model belongs.

The utility model relates to the oil and gas industry, namely to equip the bottom of the casing string, which can be used to reliably separate the tubular and annular space when attaching boreholes, cleaning the inner surface of the casing string from the mudcake, separating the cement (cement) solution.

The level of technology.

A known utility model (RU 29557 U1), in which the task of reliable sealing in the “stop ring” zone, is solved by a device containing a separating plug, including an elastic cuff mounted on a large-diameter core section and a retainer placed on the support sleeve, and the diameter of the sealing elements is chosen for the internal diameter of the upper cylindrical part of the “stop ring” with the top seat, the shoulder and the lower cylindrical part connected to the body and installed in the casing.

The disadvantage of the design is the metallic elements of the structure that affect the time of drilling, the wear of the armament of the drilling tool (chisel, cutter).

The closest technical solution to the proposed utility model is the design (EN 102670 U1), the technical result of which is to simplify the design, improve the fixation of the cork in the seat, increase the speed of drilling. In the design of the core, retainer, support sleeve can be made of aluminum alloy. What allows to reduce time for drilling of the device.

The disadvantage of the design is also metal elements of the structure that affect the time of drilling, the wear of the armament of the drilling tool (chisel, cutter).

Disclosure of the essence of the utility model

The technical result, which is aimed at the utility model, is easily overrun, which affects the reduction of the cement drilling time and the reduction in the wear and tear of the drilling tool armament.

The essential features are:

- all metal elements in the composition of the cork and stop rings, which are replaced with a composite material (caprolon - polyamide 6 block), are excluded from the construction to simplify the design and simplify the drilling of the structure after cementing the column.

- the process of drilling elements of the structure, to which, in addition to abrasive-cutting action, a crumbling action is added, which speeds up the process of drilling.

- the exclusion of such negative effects of drilling as sintering, hooking over the column due to the inertness of the composite material to these surfaces.

- minimizing the wear and tear of the armament of the drilling tool due to the absence of metallic elements in the structure and the softness of the composite material in relation to the armament of the drilling tool.

Brief Description of the Drawings

FIG. 1 shows a cork plug, which is the upper, movable element of a snap. The cork consists of casing body 1 (caprolon), cork sleeve 2 (caprolon), cork sleeve 3 (rubber), cork nut 4 (caprolon).

FIG. 2 depicts a stop ring, which is the lower part of the tooling installed at the bottom of the casing string at the beginning of the descent of the string into the well. It consists of a stop ring body 5 (caprolon), a sealing ring 6 (rubber), a split ring 7 (caprolon), a nut 8 (caprolon), a stop ring bush 9 (caprolon), a rubber ring 10 (rubber), a cuff of feet -rings, axial pair 7 (rubber).

FIG. 3 - complete tooling assembly, made in kind for well testing.

FIG. 4 - flush plug assembly.

FIG. 5 - stop ring assembly.

FIG. 3-5 are not indicated in the patent application, as materials for publication. Intended only for visualization of equipment specialist in this field of technology.

Implementation of the utility model

1. The cork (Fig. 1), pressed by the buffer solution, pushes the cement slurry in the casing string, separating the two media with cuffs 3.

2. When planting plugs in a stop ring (Fig. 2), body 1 plugs squeezes the sleeve 9 stop rings. Sleeve stop ring 9 is designed to protect the internal elements of the stop ring in the process of pumping cement slurry. The sleeve 9 is held by the axial sleeve pair 11 in the stop ring until the casing 1 ejects with the body.

3. When reaching the narrowing zone of the lower part of the body 1 The plugs to the position of the ring of the split 7, the body of the plug 1 is fixed by the split ring 7 in the narrowing zone, preventing its axial movement and mixing of the separated media.

4. Upon hardening of the cement slurry, the rig is drilled.

Information confirming the possibility of obtaining when implementing a utility model of a technical result.

Information on the theoretical substantiation of the choice of material - in the selection of a composite material for the implementation of a utility model, navivny glass-carbon plastics, which are expensive, were excluded, which would not allow the utility model to compete with existing structures. For bench tests, composites have been selected that are capable of accepting the load created in the technological process — viniplast, polyacetal, fluoroplastic, textolite, caprolon. The material that successfully passed the bench tests, approved for field tests is caprolon.

Information on the conducted equipment tests (Appendix to the description).

Claims (1)

Rigging of the bottom of the casing, including a flush plug and a stop ring for reliable separation of the tubing and annular space when attaching boreholes, cleaning the inner surface of the casing string from the mudcake, separating cement slurry made of a composite material - caprolon, which ensures the rigidity of the equipment , thereby speeding up the process of drilling the tooling after cementing the column and minimizing the wear of the weapon of the drilling tool due to the absence I have metal elements in the design.

Images