RU2832762C1 - Flushing nozzle of flexible continuous-compressor pipe for support of activation balls in well - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry, namely to tools operating inside a well, such as a flushing nozzle for accompanying activation balls in a well before their seating in a seat. Flushing nozzle of the flexible continuous-compressor pipe for accompanying the activation ball in the well consists of a housing with an outer diameter of 44.45 mm, an end part of the housing in the form of a hemisphere with flushing holes for flushing outward. It has a hollow part extending to the end part of the housing, the end part of the housing is made in the form of a concave inside hemisphere with an annular generatrix, flushing holes are made in the form of eight flushing holes located along the perimeter of the said annular generatrix at the same distance from each other, each of the flushing holes has diameter of 4 mm and is connected to the hollow part.

EFFECT: fast and accurate delivery of the activation ball in the well before its seating in the seat at the required depth of the well, which reduces the activation time of downhole equipment.

1 cl, 1 ex, 2 dwg

Description

The invention relates to the oil and gas industry, namely to tools operating inside a well, such as a flushing nozzle for accompanying activation balls in a well until they are seated in a saddle. Activation balls are intended for activating downhole equipment, such as hydraulic fracturing sleeves, activation sleeves.

The prior art includes flushing nozzles for various purposes used to flush wells after hydraulic fracturing (HF) or to activate downhole devices with preliminary flushing of the landing site. The company OOO Bittekhnika, Perm, produces such flushing nozzles, which are presented below.

The NS type sphere nozzle is designed for well flushing, proppant washing out of the well after hydraulic fracturing, as well as washing out sand and hydrate-paraffin plugs in tubing columns. The nozzle design is a spherical body with one straight flushing channel and four side channels in different directions for the passage of flushing fluid (http://bittehnika.ru/catalog/oborudovanie-dlya-koyltyubingovykh-ustanovok/nozzlens/nozzlesphereNS/).

The ball flushing nozzle (SHNP) is designed to activate downhole devices with preliminary flushing of the landing site. Structurally, it has a spherical nozzle of a certain size at one end, the body has side flushing holes that allow the landing site to be cleaned of accumulated sludge by means of a jet of flushing fluid (http://bittehnika.ru/catalog/oborudovanie-dlya-koyltyubingovykh-ustanovok/nasadkapromiv/nasadkaSHNP/).

The flushing nozzle with lateral channels (NRWC) is designed for well flushing, proppant flushing from the well after hydraulic fracturing, as well as flushing sand and hydrate-paraffin plugs in tubing columns. The nozzle design is a spherical body with one straight flushing channel and four lateral channels located at an angle of 45°C for the passage of flushing fluid (http://bittehnika.ru/catalog/oborudovanie-dlya-koyltyubingovykh-ustanovok/nasadka/nozzlewithlateralchannels/).

Flushing nozzles are not designed to accompany the activation ball in the well until it lands in the seat at the planned well depth, which is their disadvantage.

A standard equal-bore flushing nozzle is known, designed to accompany the activation ball in the well before it is seated in the saddle in order to activate the downhole equipment, selected as the closest analogue (https://uralimp.ru/katalog/zaboynye-komponovki/promyvochnye-nasadki-standartnogo-tipa?ysclid=lsmuh3x1yn950985487). The flushing nozzle with an outer diameter of 44.45 mm has a hemispherical shape in the end part and five holes, four of which are located at an angle of 45 ° to the axis of the hemisphere along the perimeter of the circle, and one hole in the center passing through the entire hemisphere along its axis. The holes for flushing have a diameter of 5 mm and a cross-sectional area of 19.6 mm ² . The size of the flushing nozzle and the total cross-sectional area of the holes of 98 mm ² ensure its passage with the activation ball through the internal passage dimensions in the upstream seats of the hydraulic fracturing coupling (HFC). However, during the descent, landings, tightenings, and passage difficulties occur, which is due to the factor of divergence of the ball with the flushing nozzle and leads to an increase in the duration of work. The movement of the flushing nozzle is carried out due to hydromechanical action through the column of flexible continuous compressor pipe. With hydraulic and mechanical resistance in the well, the flushing nozzle does not always bring the activation ball to the seat at the required depth in the well, which is a significant drawback. As a result, the entire process of activation of downhole equipment slows down.

The invention solves the technical problem of eliminating the above-mentioned shortcomings, namely, it reduces the activation time of downhole equipment.

The technical result of the invention consists in the fast and precise delivery of the activation ball in the well until it is seated in the seat at the required depth of the well due to the design features of the flushing nozzle.

To solve the specified technical problem and achieve the stated technical result, a flushing nozzle of a flexible continuous-compressor pipe (CCP) is proposed for accompanying the activation ball in the well, consisting of a housing with an external diameter of 44.45 mm, an end part of the housing in the form of a hemisphere with flushing holes for flushing. A distinctive feature of the nozzle is the shape of the end part of the housing in the form of a hemisphere concave inward with an annular generatrix, along the perimeter of which eight flushing holes are located at the same distance from each other, each of which has a diameter of 4 mm.

Fig. 1 and Fig. 2 show a diagram of the flushing nozzle, where:

1 - body,

2 - end part,

3 - flushing hole.

The CT flushing nozzle has a body (1) made of steel with an outer diameter of 44.45 mm, the nozzle is hollow inside up to the end part. The end part (2) is made in the form of a hemisphere concave inward with an annular generatrix, along the perimeter of which eight flushing holes (3) are located at the same distance from each other, with a diameter of 4 mm each, connected to the hollow part of the nozzle.

The flushing nozzle with the end part of the housing in the form of a hemisphere concave inward allows for better retention of the activation ball. Eight flushing holes (3) with a diameter of 4 mm each, located along the annular generatrix of the hemisphere concave inward, create jets of liquid flow in the form of a "circular fan" with an angle of inclination to the axis of the nozzle of about 45°, which leads to centering and retention of the ball due to the hydraulic action of the liquid flow. The cross-sectional area of eight flushing holes is 100 mm ² and corresponds to the cross-sectional area of five flushing holes of a standard flushing nozzle, equal to 98 mm ² , which ensures the absence of hydraulic resistance to the liquid flow. The location of the holes (3) and their number provide sufficient intensity of the liquid flow in the form of a "circular fan". Such a fluid flow, as well as the end part with a hemisphere concave inward and the absence of a flushing hole in its center, together create optimal conditions for holding the activation ball, centering it in the hemisphere of the end concave inward due to the hydraulic effect of the fluid flow. The factor of divergence of the ball with the nozzle for accompanying the ball is reduced to a minimum and, as a result, the time for delivering the ball for activating downhole equipment is reduced, which has been proven in practice during the production of works on the running and lifting operation of flexible tubing (CT) in a real well.

Thus, with the help of the flushing nozzle, the activation ball is quickly and accurately delivered to its seat at the required well depth, thereby achieving the technical result.

Example

The flushing nozzle tests were conducted in a gas well with horizontal completion with HF couplings. The well had a horizontal 114.00 mm liner and an internal diameter of 97.18 mm. As a result, the discrepancy between the flushing nozzle with a diameter of 44.45 mm and the ball was 5.10 mm.

The lowering and lifting operation of the tested flushing nozzle in the well to a planned depth of 5355 m with a support interval from the moment of receiving unloading of the nozzle onto the activation ball equal to 465 m was completed in 14 hours (0.58 days).

The tripping operation of a standard nozzle in a well to a maximum depth of 4870 m, where the support interval from the moment of receiving the nozzle unloading onto the activation ball to the moment of meeting the ball is 120 m, was completed in 54 hours (2.25 days).

The difference in time costs is noticeable when using the declared flushing nozzle and the standard nozzle in tripping operations (TOO) in gas wells.

The source of the economic effect is the time costs of the SPO, which, all other things being equal, are reduced by approximately 3 times. Consequently, the direct economic effect for the subsoil user in monetary terms will be approximately equal to 3 times the actual cost of services rendered using the declared flushing nozzle.

Claims (1)

A flushing nozzle of a flexible continuous-compressor pipe for accompanying an activation ball in a well, consisting of a housing with an outer diameter of 44.45 mm, an end part of the housing in the form of a hemisphere with flushing holes for flushing, extending outward, characterized in that it has a hollow part extending to the end part of the housing, the end part of the housing is made in the form of a hemisphere concave inward with an annular generatrix, the flushing holes are made in the form of eight flushing holes located along the perimeter of the said annular generatrix at the same distance from each other, each of the flushing holes has a diameter of 4 mm and is connected to the hollow part.