RU131061U1 - TECHNOLOGICAL COMPLEX FOR DRILLING AND DEPRESSIONAL CLEANING OF THE SAND PLUG - Google Patents

Abstract

Technological complex for drilling sand plugs and depressurizing wells, consisting of a drilling and depressing device and a device for regulating air flow, characterized in that the device for regulating air flow contains a hose and ball valve, made with the possibility of optimal expenditure of energy of depression, while a screw auger installed in the drilling device, is made with the possibility of unimpeded transportation of drilled sand plugs, liquid and sludge through the core yc drilling device and the check valve in the container of tubing pipe.

Description

The utility model relates to the oil industry, namely to the technique of oil, gas and water production, and is intended for cleaning wells from sand plugs together with bottomhole sludge and solids during overhaul and underground well repairs.

Prerequisites for creating a utility model.

Analysis of the current level of technology in this field showed the following.

During the construction, repair and operation of wells, problems arise in cleaning the bottom of sand and other plugs that occur during various technological operations, for example, as after hydraulic fracturing.

Currently, the following types of technology and equipment are used to solve this problem:

- Standard flushing, where a feather in the form of a percussion instrument is used to loosen the plugs, and backwashing is used to lift the loosened material from the bottom.

- If, as a result of the application of standard washing, a positive effect is not achieved, then D-105 drilling equipment is used, where the cork is loosened by rotation of the cutters. The rise of the drilled plug is due to the circulation of fluid under pressure.

The disadvantages of using drilling equipment are:

- in the absence of fluid circulation under pressure, the D-105 penetration stops.

- at a high speed of rotation of the cones, the low lifting speed of the loosened material results in sanding the tool, stopping and an emergency.

Known bailer for cleaning wells from drill cuttings, having a sludge collection chamber located in the lower part of the body and made in a conical shape (Aut. St. USSR No. 1078027, IPC class E21B 27/00).

The disadvantage of this flap is a design feature, which consists in the fact that the sludge collection chamber is at the same time a receiving chamber, which reduces the performance of treatment work.

A well-known flap for cleaning the bottom of the well, in the body of which there is a hollow rod, a plunger having an injection cavity and forming a single injection channel in communication with the tubing string and a receiving cavity with a valve in the form of a damper (RF Patent No. 2060356, class IPC E21B 27/00).

The constructive implementation of this flap does not provide additional operational modes of operation, allowing for additional cleaning of the well from sludge and mechanical impurities at the bottom of the well.

A well-known hydraulic complex for cleaning deep wells containing a bailer with a hollow rod, a plunger pump with a discharge channel in communication with the tubing string, a receiving chamber with a cavity and a valve in the form of a shutter and a container with a sludge-collecting cavity (RF Patent No. 2173380, IPC class E21B 37 / 00).

The disadvantages of the complex are the design complexity due to the presence in the receiving cavity of the valve in the form of a damper, the unreliability of its operation.

Closest to the proposed technical solution is a borehole complex for flushing technology, consisting of technological equipment for underground and major overhaul of wells, production casing, tubing, base part, a modular part for cleaning the bottom hole and a modular part for cleaning the bottomhole formation zone, and the base part includes the technological layout of the hydraulic valve with a bypass valve, an adjustable throttle clutch and pipes, a modular part with erzhit drill tip, wherein the modular part to clean bottomhole formation zone comprises a slotted tube filter, and centralizer container. (PM of the Russian Federation No. 84048, IPC class E21B 27/00). The disadvantages of the complex are:

- low efficiency when working with plugs of large length (more than 1 m.) due to the short duration of the hydraulic valve.

- reduction in the volume of intake of sludge from the bottom of the well due to plugging in the drill nozzle;

The present utility model is based on solving the problem of creating a technological complex for drilling and cleaning sand plugs in an oil well, which allows to improve the quality and efficiency of well cleaning by expanding the treatment regimes.

Therefore, to improve the efficiency of well cleaning and drilling sand plugs, and in other cases, it is proposed "Technological complex for drilling and depression cleaning sand plugs" further: "Technological complex ...".

"Technological complex ..." is illustrated by drawings, where Fig. 1 shows its design, and the technological process is shown in the following figures: Fig. 2 - stage I, Fig. 3 - stage II, Fig. 4 - stage III.

"Technological complex ..." (see figure 1) for cleaning wells includes production casing 7 with the wellhead 5 and the bottom of the well 10 and the borehole fluid 8 and contains the following main nodes:

- drilling device 1 (hereinafter referred to as control unit):

- Depression device 2 (hereinafter referred to as DE);

- air flow control device 3 (hereinafter URPV);

In turn, the drilling device 1, which serves for drilling sand plugs, consists of (see Fig. 2): an internal mill 11, a housing 12, a spring pusher 13, a bearing assembly 18, a screw auger 19, and an external mill 20.

Depression device 2, designed to suck the drilled plug, consists of the following main components (see figure 2): check valve 17, the regulator of the flow rate of the liquid and sludge 16, the bypass valve 14, the overflow valve 15.

The tubing tubing (tubing) 4 serves as a container for collecting sludge waste and sand plugs.

To improve the use of the energy of depression created due to the difference in the hydrostatic column of liquid, a device for regulating air flow (URPV) 3 was used.

URPV consists of a hose 21 and a ball valve 22. (see Fig. 3).

The above-mentioned main devices form a single complex designed for drilling, simultaneous depressurization and collection of sludge waste from sand plugs and borehole bottom into a container consisting of tubing pipes.

The technological process of cleaning wells is illustrated in figure 2, figure 3, figure 4.

The first stage (see figure 2) - the descent of the "Technological complex ..." to the place of drilling sand cork. To maximize the difference in the hydrostatic column of fluid through the valve 6 (see figure 1) and wellhead reinforcement of the wellhead 5, fluid is added to the production casing 7 of the well to the wellhead.

The second stage (see figure 3) - unloading "Technological complex ..." at the location of the sand plug 9 after topping up the liquid (see figure 1 and figure 2)

Under the influence of the weight of the tubing 4 pipes, the bypass valve 14 opens, at the same time, through the spring pusher 13, the inner mill 11 rotates and extends, milling the sand plug 9. The milled elements of the sand plug 9 are sucked into the container from the tubing 4 by pressure. Next, the inner mill 11 stops the movement and becomes a support for moving the outer mill 20. The force for moving the outer mill 20 is also transmitted through the spring pusher 13 and the bearing assembly 18. The alternating movement of the inner mill 11, and then the outer milling cutter 20 with the simultaneous suction of the drilling waste occurs cyclically until the sand cork is completely drilled.

For the effective operation of the "Technological complex ..." the following devices are provided:

- a regulator of the flow rate of the liquid and sludge 16 (see figure 2), necessary to eliminate water hammer on the production casing. Regulation is carried out by the selection of throttle nozzles depending on the depth of the well and the type of expected sludge.

- a screw auger 19, necessary to reduce plug formation in the drilling device, and to efficiently transport sand plug and sludge elements to a container from tubing 4.

- a device for controlling the air flow 3 (see figure 1), which allows you to optimally select the mode of expenditure of energy of depression by using a hose and shut off the ball valve.

The third stage (see figure 4) - the rise of the "Technological complex ..." and the discharge of excess fluid.

After making sure that the depression device 2 is fully tested (Fig. 1), tubing 4 and equipment are lifted. If the lift is made with a siphon, a crowbar is thrown inside the tubing 4 to actuate the shut-off valve 15 (Fig. 2) and the subsequent discharge of liquid from the tubing 4. The further tubing 4 is lifted according to safety conditions and technological requirements.

Improving the efficiency of cleaning wells "Technological complex ..." in comparison with other technical solutions is achieved by:

- The combination of the positive properties of the drilling device, where the drilling is due to the simultaneous extension and rotation of the cutters, and the depression device, where the absorption of the elements of the drilled plug and sludge occurs due to depression.

- Optimization and regulation of technological processes through the use of fluid and sludge flow regulators, screw augers, air flow control devices.

- The use of depressive and boring devices that contribute to the emergence of a synergistic effect, especially in wells with increased fluid absorption.

- Simultaneous operation of the drilling device (drilling a cork) and a depression device (suction and collection of a drilled cork).

- Expansion of operating conditions: “Technological complex ...” can work both due to the pressure difference in the well and in the system, and due to the functioning of the drilling device.

The advantages of the proposed technical solution are:

- the suction rate of the drilled plug and sludge is much higher than the rotational speed of the cutters of the drilling device;

- the process of drilling and simultaneous cleaning occurs without the use of fluid circulation;

- reducing the time of well repair and thereby increase the time between overhauls (overhaul repair of wells);

- time reduction and cost savings on the use of special equipment;

- work in wells where liquid absorption;

- the quality of treatment and the ecology of the formation are improved, since the products of treatment and the liquid of killing do not fall into the formation;

- improving the quality of well cleaning due to post-treatment of sludge and sand plugs from the bottom of the well during repeated cycles;

- optimization of technological processes through the use of regulators of fluid flow, air, as well as the transport of sludge into the container of the "Technological complex ...", consisting of tubing;

- reduction of well repair time, especially if the well absorbs fluid;

- an increase in the performance of treatment works, since the system can be designed for any volume of collected sludge.

The proposed device can be manufactured industrially, as evidenced by successful tests of a prototype.

Claims (1)

Technological complex for drilling sand plugs and depressurizing wells, consisting of a drilling and depressing device and a device for regulating air flow, characterized in that the device for regulating air flow contains a hose and ball valve, made with the possibility of optimal expenditure of energy of depression, while a screw auger installed in the drilling device, is made with the possibility of unimpeded transportation of drilled sand plugs, liquid and sludge through the core yc drilling device and the check valve in the container of tubing pipe.

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