Device for treating well walls within range of productive bed

FIELD: oil and gas extractive industry.

SUBSTANCE: device has pipe-like body with detachable upper and lower sleeves. Concentrically to body, with possible rotation relatively to it, a cover is mounted with blades with scrapers placed spirally on its surface. To lower sleeve a reactive end piece is connected with slit apertures. End piece hollow is filled with granulated material engaging in exothermal reaction with acid. Lower portion of end piece is provided with check valve. Upper sleeve is provided with check valve having locking element in form of sphere with shelf and centering elements, to be dropped from well mouth. Base of saddle of check valve is made in form of disc having diameter equal to diameter of body. Pass aperture of saddle in lower portion is overlapped with easily destructible and easily removed element. Length of sphere shelf is greater than height of pass aperture of saddle of check valve of upper sleeve.

EFFECT: higher reliability, higher efficiency, broader functional capabilities of device.

3 cl, 4 dwg, 1 tbl

 

The invention relates to the oil and gas industry and will find use in the purification prefiltrov of the casing in the productive interval of the formation to increase the production capabilities of the well.

A device for processing the borehole walls [1], comprising a hollow body having mounting threads on the ends and concentric set him by the casing for rotation around the body. On the outer surface of the casing are spiral blades with brushes, while the upper part of the housing is fitted with a sub with a pocket and a seat for the check valve. A disadvantage of the known device is of limited use because of design features, for example, it does not provide more fully to bear on the surface of the treatment products, make thermoacid processing, resulting in large costs, processing time, and the reservoir is not processed.

It is also known a device for processing the borehole walls in the productive interval of the formation [2], which partially addressed the shortcomings inherent in analogue.

This device, spuskaemogo on the column tubing (tubing), is intended for thermochemical processing of bottom-hole formation zone and comprises a tubular housing with a flanged upper and lower couplings on the th ends, mounted concentric with the housing for rotation relative to the Central axis of the casing with spirally arranged on the outer surface of the blades with attached scrapers attached to the bottom of the clutch housing reactionary tip with a slit-like holes, the cavity of which is filled with granular material entering the exothermic reaction with the acid, and the lower part is equipped with a check valve.

The specified device to the technical nature more close to the offer and may be taken as a prototype. Without diminishing its advantages, we note that as a result of thermochemical processing of the wall zone of the filter wells hot acid trapped in the reservoir, is to react with the reservoir rock, and melts partidocracia substances deposited in the channels and pores of the reservoir, which is only partially taken out of the reservoir, and the complete removal of them from the reservoir is not provided, which reduces the effectiveness of the event.

The present invention is to improve the reliability and efficiency of processing the wall zone of the reservoir, as well as deep cleaning of the reservoir by extending the functionality of the device.

The problem is solved by the described device, spokeman on the tubing the RUB (tubing), including a tubular housing with a flanged upper and lower couplings at its ends, mounted concentric with the housing for rotation relative to the casing with him arranged spirally on the outer surface of the blades with attached scrapers attached to the bottom of the clutch housing reactionary tip with a slit-like holes, the cavity of which is filled with granular material entering the exothermic reaction with the acid, and the lower part is equipped with a check valve.

What's new is that the upper clutch housing is fitted with non-return valve with discharged from the wellhead shut-off element in the form of a ball plate and the centering elements and the base seat valve upper coupling is made in the form of a disk with diameter equal to the diameter of the housing, and installed in the junction between the body ends and the pipe of the casing, while the penetration hole of the saddle valve upper coupling bottom blocked easily destroyed or easily removable element, the length of the projection of the ball is greater than the height of the bore hole saddle valve upper clutch to allow the opening of its protrusion bore holes saddle valve the upper coupling and overlap the ball when the pressure at the well bottom is less than the hydrostatic is Alenia in the cavity of the casing or in equality, when this element for overlapping bore holes saddle valve upper coupling bottom is made in the form of a disk made of fragile material such as ceramic or fiberglass, and is attached to the base by pins or glue, and centering elements of a ball made in the form of tendrils of metal wire.

Attached to the application drawings explain the essence of the invention, in which figure 1 schematically shows the inventive device in General, lowered into the productive interval of the formation on the column tubing (tubing)where we can see the connection of the casing with the housing by means of balls to ensure its rotation around the body, in a partial section.

Figure 2 - view As figure 1, the upper coupling housing with the valve seat, the penetration hole whose bottom is blocked easily destroy the disk, in the context.

Figure 3 shows the locking element in the form of a ball for the valve seat, the top of the clutch housing where you can see his lip and centering elements in the form of antennae.

Figure 4 - blade casing with cleaning scrapers.

Preliminary patent research conducted by the authors showed that the technical solutions of similar purpose of obtaining such a positive effect, as proposed, is not detected. Therefore, according to the authors, the inventive method of udovletvor the t criterion of “novelty” and “inventive step”, and its practical applicability, see the full description of the implementation of the device.

The device spuskaemogo on the tubing string comprises a tubular housing 1 (see figure 1) connecting the upper and lower couplings 2 and 3 at its ends, mounted concentric with him with the possibility of rotation relative to the Central axis of the housing cover 4 that is associated with it in the end parts 5 balls, placed in the annular grooves 6 and 7 of the casing and the body of the casing 4, respectively.

The outer surface of the casing 4 provided with spirally arranged blades 8, the operating surfaces 9 which are provided with reinforcing inserts 10 carbide, and their side edges secured scrapers 11 (see figure 4). The uniform rotation of the casing around the body under the reaction liquid is achieved due to the presence of intermediate blades 12. Attached to the lower coupler 3 body reaction tip 13 with slit-like openings 14 filled with granular cyclotrisiloxane material 15 who exothermic reaction with the acid. The lower part of the reaction handpiece is equipped with a check valve seat 16 under the shutoff element 17.

The upper coupler 2 of the housing is fitted with a check valve discharged from the mouth with a locking element in the form of a ball 18 with the tab 19 and the centering elements 20, made in the form of antennae (see figure 3 and 2). The base of the saddle can upper coupling is made in the form of a disk 22 with a diameter, equal to the diameter of the casing and installed in the junction between the ends of the housing 1 and the pipe 23 of the tubing on which the device is lowered into the borehole 24. While the penetration hole 25 of the valve seat of the upper coupling bottom blocked easily destroyed or easily removable element 26 made, for example, in the form of a disk. The latter is attached from below to the base seat 21 by pins or glue and is made of fragile material such as ceramic or fiberglass.

The length of the projection 19, discharged from the mouth, the ball 18 is greater than the height of the bore hole saddle valve upper coupler 2 to allow the opening of its protrusion bore holes saddle valve upper coupling and overlap the ball when the pressure at the well bottom is less than the hydrostatic pressure in the cavity of the casing or when they are equal.

The device operates as follows.

Before lowering the device into the well first, determine the depth of the productive interval of the formation, its power and then in the bottom zone download acid definite volume, after which the well left alone for impregnation layer for 5-6 hours.

Further, the device is assembled, as shown in figure 1, is lowered into the productive interval of the formation on the drill pipe, pre-filling the reaction tip 13 gr is numeronym cyclotrisiloxane material 15, for example, magnesium, entering in an exothermic reaction with acid, for example hydrochloric acid 20-27%concentration. Since the penetration hole 25 of the valve of the upper coupler 2 is overlapped with the bottom sealed easily destroyed by the disk 26, the cavity of the tubing is under atmospheric pressure and perform the role of implosion chamber. Upon contact of hydrochloric acid (Hcl) with a granular magnesium starts to happen exothermic reaction, resulting in the acid solution is heated.

Mg+2hcl=Mgl2+H2+459 kJ.

Need a specific amount of heat to 1 m thick layer to melt the paraffin and wax substances can be determined by calorimetric formula:

,

where ΔT1=CCI-MP, here CCI, MP, respectively, the melting point of the paraffin and reservoir temperature;

Ci is the heat capacity of the substance;

gi - specific quantity of substance per 1 m thickness of the layer.

Substituting the numerical values of the parameters in this formula, will receive the amount of heat necessary for melting the wax in the reservoir interval of 1 m radius 0.5 m

Q=63000 kJ.

It is known that the reaction of 1 kg of magnesium with Hcl heat in the number 18940 kJ. Then the required amount of magnesium to layer 1 m thick with a radius of 0.5 m

63000:18940=3.3 is,

In practice, taking into account the heat loss due to heat transfer to the environment amount of Mg and Hcl taken with a margin of 2-3 times larger than the estimated. For example, at 1 m thickness of the layer of granulated magnesium take 7-10 kg, and hydrochloric acid at 15-20%concentration of 1.5-2.0 m3.

The following table shows the required number of 15%Hcl at 40, 60, 80 and 100 kg of magnesium (see also the book Vigodina and BImSchV “Methods to increase the productivity of wells 1996, s).

Qty 15% Hcl, m3the number of Mg kgThe increase in temperature, WithResidual concentration, Hcl %
406080100
2,03,04,05,01209,6
2,43,64,86,010010,5
2,84,25,67,08511,0
3,24.86,48,07511,4
4,03,08,010,06012,2

After the descent of the device in intervals in the productive formation immediately begin applying the tool to a reciprocating movement, in the interval the location of the filter. The blades 8 of the housing 4, meeting in its path resistance of the liquid, under the action of its reactions start to rotate around the body, while intensively mixing the heated acid to a temperature of +100°C and above, which provides a constant washing of magnesium, as well as the filtration openings of the casing new portions of the hot solution of the acid of higher concentration. In addition, it contributes to the accelerated decay of granulated magnesium prevents sintering and reaction products in the reaction tip, which is very important in obtaining a full generation of heat and, consequently, in improving the efficiency of thermoacid processing, because the increased reactivity of the working fluid is an acid relative to the rock formation, as well as paraffin and wax substances, contributes to their exit from the PPP, thus increasing the permeability of the formation.

After complete dissolution of the magnesium bottomhole zone withstand 2-2 .5 hours with the aim of effects hot acid solution on the breed of the productive formation.

After this time from the wellhead into the cavity of the casing throw the locking element is a ball 18, which when flying down, having a large kinetic energy, its protrusion 19 through the penetration hole of the seat 21, the kick is I with great force, destroys the disk 26 (or removes it). Through the open bore hole 25 of the valve seat, lifting the ball 19, the hot acid treatment products under high pressure rushes up into the cavity of the tubing, in which there is a deep depression in the reservoir, where the action of the reservoir considered also the products of its processing. When the pressure at the well bottom is less than the hydrostatic pressure in the cavity in the tubing or in case of equality, the ball 19 sits in the saddle 21 and thereby blocks the penetration hole of the seat, thus preventing discharge of fluid accumulated in the cavity of the tubing (implosion chamber) back into the bottom hole.

In this processing operation near-wall zone of the reservoir ends and the device is raised to the surface. Next, the well is completed, after which it put into operation.

Technical appraisal and economic benefits of the proposal are as follows.

The device is simple in design and versatile, which allows you to comprehensively influence of wall prefiltrov zone of the reservoir, and the reservoir that provides improved processing efficiency. In addition, this simplifies the processing technology, resulting in greatly reduced costs of time and materials for processing.

Sources of information

1. Patentf No. 2189432, M CL E 21 In 37/02, BI No. 26, 2002

2. RF patent №2172399, M CL E 21 In 43/25, 43/27, BI No. 27, 2002

1. A device for processing the borehole walls in the interval of the reservoir, spuskaemogo on the column tubing (tubing), comprising a tubular housing with a flanged upper and lower couplings at its ends, mounted concentric with the housing for rotation relative to the casing with him arranged spirally on the outer surface of the blades with attached scrapers attached to the bottom of the clutch housing reactionary tip with a slit-like holes, the cavity of which is filled with granular material entering the exothermic reaction with the acid, and the lower part is equipped with a check valve, wherein the upper coupling housing is fitted with non-return valve with discharged from the wellhead shut-off element in the form of a ball plate and the centering elements and the base seat valve upper coupling is made in the form of a disk with diameter equal to the diameter of the housing, and installed in the junction between the body ends and pipe tubing, while the penetration hole of the saddle valve upper coupling bottom blocked easily destroyed or easily removable element, the length of the projection of the ball is greater than the height of the bore hole saddle valve upper coupling is, to ensure the possibility of opening its protrusion bore holes saddle valve upper coupling and overlap the ball when the pressure at the well bottom is less than the hydrostatic pressure in the cavity of the casing or when they are equal.

2. The device according to claim 1, characterized in that the element for overlapping bore holes saddle valve upper coupling bottom is made in the form of a disk made of fragile material such as ceramic or fiberglass, and is attached to the base by pins or glue.

3. The device according to claim 1, characterized in that the centering elements of the ball is made in the form of antennae from metal wire.



 

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2 cl, 3 tbl, 23 ex

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