The method of supplying the solid reagent into the well and the device for its implementation

 

The invention relates to subsurface equipment well designed to deliver solid reagent into the well and feeds it into the flow of the reservoir fluid. The method of supplying the solid reagent into the well includes determining the flow rate and the water content of the reservoir fluid, placing the device with the solid reagent in the well bore, the dissolution of solid reagent flow of the reservoir fluid received from the reservoir and passing through the device in the form of a module of series connected on the ends of the sections placed in each section of the solid reagent of one kind or solid reagents of different kinds. Sections are connected to each other through the holes in the perforated base. Depending on the form of a solid reagent, placed in the partition, and the previously defined flow rate and the water content of the reservoir fluid, the ratio of the sum of squares of the cross-section of radial channels hosted on 1 m length of the section to the cross-sectional area of the section perform equal to 0.2-3. The device is placed in the barrel swainy in the perforation interval in limbo or based on slaughter. Device for feeding solid reagent into the well contains the module of sections in the gain hollow cylindrical body with radial channels, hydraulically coupled to the well. Sections are connected in series ends via a connecting node and communicated with each other through the holes in the perforated base. Radial channels in the housing of each section holds uniformly. Depending on the form of a solid reagent, flow rate and the water content of the reservoir fluid, the ratio of the sum of squares of the cross-section of radial channels placed at 1 m section length to cross-sectional area of the section, is made equal to 0.2 to 3.0. The free end of the device is covered with the perforated cover. Allows stable uniform and efficient removal of solid reagent various actions both in high-and low yield wells during different modes of operation and whenever the viscosity of the reservoir fluid. 2 S. and 6 C.p. f-crystals, 6 ill.

The invention relates to the field of oil production, in particular to methods for filing in the well of the solid reagent as one species, and solid reagents of different kinds, and also applies to underground equipment is well designed to deliver solid reagent into the well and to feed it into the flow of the reservoir fluid.

There is a method of feeding granular scale inhibitor into the well, including the placement of the container Poppet type with a granular inhibitor on the bottom of the borehole below the perforated interval, and the dissolution inhibitor in the flow of the reservoir fluid received from the reservoir and passing through the container, and the specified dissolution produced by forced circulation through the container part of the reservoir fluid, which is then mixed with the rest of the area (see and.with. The USSR №1167307, CL E 21 In 43/00, 1983).

However, this known method does not allow to use both solid reagents of different types, and allows the use of only solid reagent of the same species, which reduces the effectiveness of the protective action of this known process. This is due to the fact that used in the known method the container Poppet type involves in the process of uncontrolled mixing of solid reagent with different “plates”, which means, in the case of the firmness of the properties.

In addition, even when using the known method of the solid reagent of the same species evenness of its ejection into the well will be achieved only under conditions of reservoir fluid of low viscosity, in the presence as well of the reservoir fluid is a high viscosity, uniform washing of the total volume of the solid reagent will not be achieved because of the difficulty in passing such liquid perforated holes “plates”, and therefore will not provide a uniform putting it in the well bore, which reduces the efficiency of the solid reagent.

Closest to the proposed technical solution to the technical essence is a way of presenting solid reagent into the well, comprising placing the device with the solid reagent in the well bore and the dissolution of solid reagent flow of the reservoir fluid received from the reservoir and passing through the device in the form associated with Elevator pipe section containing a hollow cylindrical body with radial channels, hydraulically connected to the well (see RF patent №2165009, CL E 21 In 37/06, 1999).

A known method can improve the reliability of the dispensing reagent into the flow of the reservoir fluid, and simultaneously provides the opportunity ispolnennogo known method is also as in the above analogy, the inability to use multiple solid reagents of different types, because used in the mentioned known method, the device will result in the implementation of the method to the formation of a mixture of solid reagent with unpredictable properties that will reduce the effectiveness of the protective action.

However, specified the known method also provides a low efficiency in terms of wells with high viscosity of the reservoir fluid, since in this case will not provide a uniform washing of the total weight of the solid reagent.

Also from the same source of information is known a device for feeding solid reagent into the well in the form connected with Shoe lift pipe sections to accommodate a solid reagent containing a hollow cylindrical body, in the upper part of which is made of radial channels, hydraulically connected with the bore and the cross-sectional area of which is not less than the sectional area of lift pipes with perforated base, with a solid reagent is placed below the radial channels and open porosity to pass through it and the upper end of the housing in the Elevator pipe upstream borehole Jew who lift wells, and the wells are equipped with deep-well pumps.

However, this known device does not provide a stable uniform removal of the solid reagent, especially in conditions of low yield wells. This is due to the fact that the main flow of the reservoir fluid in the known device is only through radial channels located above the solid reagent, and therefore periodic nonuniform pumping of small volumes of the reservoir fluid will not allow you to uniformly wash the entire volume of the solid reagent in the device. This disadvantage is exacerbated in the case of high viscosity of the reservoir fluid.

Given that the solid reagent in the known device is placed with the open porosity in the upper part and the lower the probability of clogging because the reservoir fluid contains large amounts of natural solids: sand, clay, pieces of rock, and as a consequence, a sharp decrease in the concentration of viable solid reagent, which will adversely affect the efficiency of processing. Moreover, this negative process can occur in wells with different flow rates and different modes of operation.

Technical result achieved offer and the reagent various types in high-, and stripper wells during different modes of operation and whenever the viscosity of the reservoir fluid, and also in the extraction of oil from reservoirs with different degree of permeability, and any reservoir pressure.

This technical result is achieved by the proposed method of supplying solid reagent into the well, comprising placing the device with the solid reagent in the well bore and the dissolution of solid reagent flow of the reservoir fluid received from the reservoir and passing through the device in the form associated with Elevator pipe section containing a hollow cylindrical body with radial channels, hydraulically coupled to the well, thus, before placing the device with the solid reagent in the well bore to determine the flow rate and the water content of the reservoir fluid, as specified devices use a module of series connected on the ends of the sections placed in each section of the solid reagent of one kind or solid reagents of different kinds, these sections are hydraulically connected with each other through the holes in the perforated base, and depending on the form of a solid reagent, placed in the partition, and the previously defined debit channels, posted on 1 m length of the section to the cross-sectional area of the section perform equal to 0.2 to 3.0, with the specified device is placed in the wellbore in the perforation interval in limbo or based on slaughter.

The achievement of the technical result is the following.

Due to the fact that in the proposed method, before placing the device with the solid reagent in the well bore to determine the flow rate and the water content of the reservoir fluid, provides a comprehensive approach to predict the degree of removal of the solid reagent of the same species, and solid reagents of different types depending on the conditions of each specific wells that will provide a uniform and economical of his dissolution.

And due to the fact that the claimed method as a device with a solid reagent module is used of several sections, provides the possibility of simultaneous application of multiple solid reagents of different types (for example, the corrosion inhibitor compositions to prevent salt or paraffin and other), each of which is placed in their section, and made them dissolve independently of each other. The result is sets the response such as corrosion, deposition of salts and paraffin.

And even and economical removal of these solid reagent is ensured by the fact that in the case of each section of the device used in the proposed method, performed in a special way radial channels, whose number and diameter depend on the form of a solid reagent, flow rate and the water content of the reservoir fluid. And in this case should be taken into account in each section the ratio of the sum of squares of the cross-section of these radial channels hosted on 1 m length of the section to the cross-sectional area of the section, comprising according to the invention of 0.2 to 3.0. For example, use solid reagent composition for preventing asphaltoresinparaffin deposits (ARPD), which is soluble in the hydrocarbon phase, the well is prolific, and the reservoir fluid is characterized by low water content, so the above ratio should be of the order of 0.5-1.0 per meter length of the body section. If the well is low, and the reservoir fluid is water-saturated, then this ratio should be increased to 1.5 to 2.5. A similar pattern applies for solid reagents another type.

Blavod is odara to they are evenly spaced along the entire height of the hull sections of the devices used in the implementation of the proposed method, provides a stable, uniform and economical removal of the solid reagent in the well bore regardless of flow rate, water production and operation mode.

And because the specified device is used in the implementation of the proposed method, is placed in the wellbore suspended or supported on the bottom, it is possible to implement the proposed method in wells of any depth.

To achieve the mentioned technical result is a device for feeding solid reagent into a well made in the form of section for placing therein a solid reagent containing a hollow cylindrical body with radial channels, hydraulically coupled to the well, while the new is that it is equipped with at least another similar section with a perforated base with the education module and placing them in solid reagent of the same species or of different species, the sections are connected in series ends via a connecting node and communicated with each other through the RNO and depending on the form of a solid reagent, hosted in section, of the flow rate and the water content of the reservoir fluid, the ratio of the sum of squares of the cross-section of radial channels hosted on 1 m length of the section to the cross-sectional area of the section is made equal to 0.2 to 3.0, and the free end of the device is covered with the perforated stub.

The proposed device, the cross-section of the radial channels may be in the form of a circle or oval and are radial channels may be made cylindrical or in the form of a truncated cone, facing the top of the inside section.

To reduce hydraulic resistance when flushing the solid reagent reservoir fluid, in particular, high viscosity, the radial axis of the channel should preferably be located at a 45-90to the longitudinal axis of the section.

When placed in the section of the proposed device as a solid reagent composition for preventing asphaltoresinparaffin deposits or composition for prevention of scaling, the ratio of the sum of squares of the cross-section of radial channels hosted on 1 m length of the section to the cross-sectional area of the section mainly should be made equal to 0.5 to 2.5.

When placing radial channels, posted on 1 m length of the section to the cross-sectional area of the section mainly should be made equal to 0.2 to 3.0.

In the proposed device mainly connecting node is made in the form of the coupling.

Through the use of the proposed device module of several similar sections, placed in each of the solid reagent only one species, the possibility of simultaneous application of multiple solid reagents of different types in a single device, which allows simultaneously integrated well treatment by feeding the solid reagent in stratiform liquid.

Due to the fact that the sections in the proposed device communicated with each other through openings in the base, and the free end of the device is covered with the perforated cover is provided along with reliable protection solid reagent from clogging, also free passage of the reservoir fluid through all the sections.

For the radial channels in the housing section, taking into account the solubility of the solid reagent, flow rate and the water content of the reservoir fluid allows you to set a fairly accurate value of the ratio of the sum of squares of the cross-section of the radial to the adjustment of the number of radial channels and their diameter, so when the operation of the proposed device will provide uniform and efficient removal of solid reagent in the well bore, which will increase the duration and increase protective effect for a long time.

Also this effect is exacerbated by the fact that the radial channels is made in the case evenly over the entire height that will allow you to uniformly wash the solid reagent reservoir fluid of any viscosity.

For the radial channels in the inventive device with different cross-sectional shape, and a cylindrical or in the form of a truncated cone, provide optimal conditions Omya solid reagent under different hydrodynamic conditions.

The execution of the radial axis of the channel at an angle close to 45°, is particularly advantageous when using the device in low yield wells with high viscosity of the reservoir fluid, because in this case, improved hydrodynamic conditions for the dissolution of the reagent.

Section in the inventive device can be connected to a connecting node, for example, made in the form of the coupling that provides rigidity and structural strength.

The proposed method and the device are illustrated coldenia radial channels in the proposed device.

The device contains a number of sections 1, which posted solid reagent 2, 3 and 4. Each section 1 consists of a body 5 with a radial channels 6 and a perforated base 7. The number of partitions 1 can vary from two or more depending on the types of solid reagents that are necessary for their submission to the produced fluid. Sections 1 are connected in series ends 8 by means of the coupling node 9, for example, couplings, and communicated with each other hydraulically through the holes 10 in the perforated base 7. The free end 11 of the device is covered with the perforated cap 12.

The device end face 11 is connected with the Elevator pipe tubing 13. When this device is placed in the wellbore or in a suspended state, or with a support 14 on the bottom hole. When this radial channels 6 in the housing 5 is made uniformly throughout the height and depending on the form of a solid reagent, placed in section 1, the flow rate and the water content of the reservoir fluid, their number is performed so that the ratio of the sum of squares of the cross-section of radial channels hosted on 1 m length of hull section to the cross-sectional area of the section was equal to 0,2-3,0.

The proposed device when the 1 take pieces of pipes with a diameter of 60-73 mm and a length of 2.5-10 m Next, in the processing of the borehole to determine the flow rate and the water content of the reservoir fluid. Based on the properties and form of the solid reagent, placed in section 1, building 5 section 1 performs throughout the height of the uniformly radial channels 6, for example, cylindrical, the diameter of the cross section of which may be equal 8-16 mm. the Number of radial channels 6 is chosen so that to satisfy the above ratio. For example, for solid reagent composition for preventing paraffin containing in wt.%: powdered synthetic or industrial detergents - 4-65 and glass liquid caustic sodium - rest, when the flow rate of 8.1 tons/day and the water content of the reservoir fluid 92%, this ratio should be approximately equal to 1.5, i.e., in section 1 length of 5 m and a diameter of 73 mm must be made 30 radial channels 6 with a diameter of 14 mm

Then made the section 1 is closed with a perforated base 7, place in it a solid reagent and combined with another section ends 8 which external thread, by means of the coupling 9 in a single module. The proposed device, according to the required number of sections 1 filled with solid reagent of the same species, and is with him lowered into the well perforation interval, leaving in limbo. If the well depth is more than 1500 m, the proposed device is set based on the face. The reservoir fluid received from the reservoir of the perforated interval, meeting in its path the proposed device, penetrates through the radial channels and through the lower perforated base 7 to the inside of the partition 1. Here is the thread in contact with the solid reagent, dissolve a part of it, then this flow is sent through another perforated base 7 in the other, above the section 1. Such partial dissolution occurs in all sections 1, which ensures the supply to the external thread of solid reagents of different actions. Further, this stream, passing through the perforated cover 12, passes through the shank in the Elevator pipe.

Permanent dissolution of the solid reagent in all sections in the inventive device, easy access reservoir fluid of any viscosity to the sections and inside them, not only provides a uniform solids reagents different views and cheap take-out, as in the manufacture of sections of the proposed device takes into account the complex downhole conditions influencing the degree on the conditions. During operation of well No. 196 of Kazanskogo field, it was found that for this well characterized the process of paraffin deposition in the tubing string, and the process of salt formation. In addition, due to high content of hydrogen sulfide in the formation fluid downhole equipment was subject to severe corrosion. To eliminate such undesirable phenomena and has been applied to the casing and the proposed method and the device.

At first, it was determined that the flow rate specified wells of 8.1 tons/day, the water content of the reservoir fluid - 92%, viscosity - 148,33 FTAs, the depth of wells 1410 m For comprehensive protection of downhole equipment required submission of three solid reagents of different types: to prevent paraffin, scale and corrosion inhibitor. As mentioned solid inhibitors were used the following substances:

- composition for preventing paraffin, wt.%: powdered synthetic (TU 2381-007-04643756-940) or technical (TU 2499-019-04643756-96) detergents 4 - 65 and glass sodium liquid caustic (TU 6-18-68-75) - rest;

composition for prevention of scaling, wt.%: technical amines (TU 6-02-750-87) 30-70, nitrilotriacetate acid (TU 6-09-20-235-93) - other solid reagents were made in the form of cylinders (“sausages”), and when this was accomplished the ratio of their cross-section to the cross section of the section as 0.50,95 depending on the form of a solid reagent and borehole conditions (flow rate and water cut).

Considering dissolving ability of solid reagents, as well as the flow rate and the water content of the reservoir fluid, for each type of solid reagent was made section of the pipe segment length of 5 m and a diameter of 73 mm In the case of the section evenly over the entire height were performed radial cylindrical channels, the cross section of which had the shape of a circle. In the housing sections for housing the composition for preventing paraffin deposition was carried out for 30 pieces of radial channels, for a composition for preventing scale - 25 PCs, and corrosion inhibitor - 20 pcs. the ratio of the sum of squares of cross sections of radial channels (Sp.to) posted on 1 m length of the section to the cross-sectional area of the section (Sc) was as follows for sections with different solid reagents:

(for the composition for the prevention ASPO)Sp.to:Sc=1,5;

(for composition for preventing scale)Sp.to: Sc=l,2, and supplied perforated bases and filled in the appropriate reagent. Then sections were collected in the module, connecting them in series ends by couplings. The order of connection of the sections was as follows: the lower section of the corrosion inhibitor, the middle section is for the composition to prevent scaling, and the top section is for the composition to prevent paraffin deposition. The free end of the upper section was blocked by a perforated stub. Then the upper section joined to the shank tubing string through the coupling and the assembled device is lowered into the well, setting it in the perforation interval at a depth of 1270 m Given that well No. 196 is shallow (depth less than 1500 m), the proposed device is left in limbo. Then the well was put into operation.

On the surface of traditional laboratory methods were monitoring the removal of solid reagents by identifying information of the ions in the reservoir fluid.

The results showed that the use of on this well present invention increased masochisthalo period works well up to 180 days (previously megacity the period of operation of the well was only 30 days).

Thus, the proposed sparrebosch reservoir fluid as one form of a solid reagent, and solid reagents of different types throughout the entire cycle of production. This provides uniform and efficient removal of solid reagent at various flow rates and operating conditions of the well, which allows, along with the increase masochisthalo period of operation of the well, to increase the turnaround time of operation of such wells is not less than 2-3 times.

Claims

1. The method of supplying the solid reagent in the well, comprising placing the device with the solid reagent in the well bore and the dissolution of solid reagent flow of the reservoir fluid received from the reservoir and passing through the device in the form associated with Elevator pipe section containing a hollow cylindrical body with radial channels, hydraulically coupled to the well, wherein before placing the device with the solid reagent in the well bore to determine the flow rate and the water content of the reservoir fluid, as specified devices use a module of series connected on the ends of the sections placed in each section of the solid reagent of one kind or solid reagents of different kinds, these sections are linked gidravlicheskogo section and the previously defined flow rate and the water content of the reservoir fluid, the ratio of the sum of squares of the cross-section of these radial channels, posted on 1 m length of the section to the cross-sectional area of the section perform equal to 0.2 to 3.0, with the specified device is placed in the wellbore in the perforation interval in limbo or based on slaughter.

2. Device for feeding solid reagent into a well made in the form of section for placing therein a solid reagent containing a hollow cylindrical body with radial channels, hydraulically connected with the bore, characterized in that it is provided with at least one similar section with a perforated base with the education module and placing them in solid reagent of the same species or of different species, with sections interconnected in series ends via a connecting node and communicated with each other through the holes in the perforated base, when this radial channels in the housing of each section is made uniformly and depending on the form of a solid reagent, placed in section, of the flow rate and the water content of the reservoir fluid, the ratio of the sum of squares of the cross-section of radial channels hosted on 1 m length of the section to the cross-sectional area of the section is made equal to 0.2 to 3.0, and the free end stroitelnyh channel has the shape of a circle or oval.

4. The device according to p. 2, characterized in that the radial channels is cylindrical or in the form of a truncated cone, facing the top of the inside section.

5. The device according to p. 2, characterized in that the radial axis of the channel is located at a 45-90to the longitudinal axis of the section.

6. The device according to p. 2, characterized in that section as a solid reagent composition for preventing asphaltoresinparaffin deposits or composition for the prevention of scaling, the ratio of the sum of squares of the cross-section of radial channels hosted on 1 m length of the section to the cross-sectional area of the section is made equal to 0.5 to 2.5.

7. The device according to p. 2, characterized in that section as a solid reagent corrosion inhibitor, the ratio of the sum of squares of the cross-section of radial channels hosted on 1 m length of the section to the cross-sectional area of the section is 0.2 to 3.0.

8. The device according to p. 2, characterized in that the connecting unit is designed in the form of the coupling.

 

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1 dwg, 5 tbl, 5 ex

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