CN217327260U

CN217327260U - Resistance increasing device and well completion structure for improving axial packing effect of continuous packing body

Info

Publication number: CN217327260U
Application number: CN202121446465.1U
Authority: CN
Inventors: 裴柏林; 宋晓强; 吴建昌; 章诵梅; 张娟
Original assignee: Anton Bailin Oilfield Technology Beijing Co ltd
Current assignee: Anton Bailin Oilfield Technology Beijing Co ltd
Priority date: 2021-06-28
Filing date: 2021-06-28
Publication date: 2022-08-30
Anticipated expiration: 2031-06-28

Abstract

A resistance-increasing device, a device and a well completion structure for improving the axial packing effect of a continuous packing body are provided, wherein the resistance-increasing device is integrally in a cylindrical structure; a central mounting hole for mounting a central pipe column is formed in the axial center of the resistance increasing device; one or more filling channels which are consistent with the axial direction of the cylinder are arranged inside and/or outside the resistance increasing device. The utility model has the advantages that the flow-through of the stratum produced water in the annular space of the shaft can be reduced by arranging the flow-increasing device with smaller flow-through area in the shaft; and secondly, the flow guide grooves are formed in the two ends of the resistance increasing devices, when the resistance increasing devices are used as standard parts in series, the resistance increasing devices can be installed on the central pipe column in series according to actual requirements on site, and the filling channels of the resistance increasing devices are not required to be aligned, so that the field assembly and use are very convenient, the field installation efficiency can be improved, and the channeling flow of the stratum produced water in a shaft can be more accurately limited.

Description

Resistance increasing device and well completion structure for improving axial packing effect of continuous packing body

Technical Field

The utility model belongs to the technical field of oil gas well exploitation, a can improve in the pit shaft in succession the packer along the increasing resistance ware of pit shaft axial packing effect, a can improve in the pit shaft in succession the packer along the method of pit shaft axial packing effect to and a can improve in the pit shaft in succession the packer along the well completion structure of pit shaft axial packing effect.

Background

In the oil and gas well exploitation technical field, the shaft of the oil and gas well generally penetrates through a plurality of sections of stratums, because the permeability of each section of stratum is usually inconsistent, and the viscosity of the stratum water is far less than that of the crude oil to be exploited, under the same bottom hole pressure difference, a large amount of stratum water is often produced from the local stratum with high permeability. The common water control method is to put a flow control pipe column (or a water control pipe column) with balanced flow into the well for water control. When the flow control pipe column is arranged in the shaft for controlling water and increasing oil, the formation water axially flows in the shaft annulus along the shaft annulus, so that the flow control of the flow control pipe column is ineffective. By sealing the shaft annulus, the production of formation water is controlled, and the channeling of the formation water in the shaft annulus is reduced, so that the method is an effective method for improving the crude oil recovery ratio. The existing method for realizing water control by packing shaft annulus mainly comprises two modes of expanding packer water control and continuous packing body water control.

The expansion packer is applied to a certain extent due to simple structure and low cost. However, this device has the following disadvantages when in use: in the first aspect, since the diameter of the device is larger than the diameter of the central pipe string (or close to the diameter of the well bore), the phenomenon that a pipe string formed by connecting a plurality of central pipe strings is blocked when the well is lowered is very easy to occur. To solve the downhole choke problem, it is necessary to reduce the number of expansion packers placed on the string, for example one per 50-100 meter interval, to isolate the wellbore into multiple separate isolated units of 50-100 meters in length. However, inside each separation unit, the wellbore annulus is still connected, and the problem of cross flow still exists, which leads to the oil production of the unit being not optimal; in extreme cases, if there is a large water outlet zone inside the separation unit (e.g. by a crack communicating with the ground bottom water), the oil recovery of the separation unit will become even lower. In the second aspect, the expansion packer is usually a prefabricated member and cannot perfectly adapt to complex well conditions such as inconsistent well diameters, non-centered central pipe columns, uneven well wall surfaces and the like, so that formation water channeling among different separation units cannot be thoroughly avoided. In the third aspect, the packer can be tightly attached to the well wall and can not be pulled out after being completely expanded when meeting the liquid. And a gap is reserved between the resistance increasing device and the well wall, so that the resistance increasing device can be pulled out.

The continuous packer water control is a new oil-gas well water control method in recent years. Refer to chinese utility model patent CN2009102507912, CN2014100135988, CN2019100846588, CN2019104892759 etc., the basic principle of this method is to fill packing particles in the pit shaft to form continuous packing body, the inside microchannel of continuous packing body formed through the micropore between the packing particles has the anti-channeling effect to producing fluid, and then reduces the output of formation water, can satisfy the actual application demand under multiple well conditions (for example, the well diameter is irregular, the pit shaft has the cover to leak, warp, cement ring channeling, there is annular space outside the old screen pipe, there is annular space outside the perforated pipe etc.). However, there are still some disadvantages in the application of this method: on one hand, because the continuous packer is bound to have a micro-channel for oil gas to pass through, in order to ensure the smooth production of the oil gas, the resistance of the micro-channel to the flow of produced liquid is not too small, so as to ensure the flow of the produced liquid; on the other hand, because the mobility of water is much higher than that of oil, for a scene that the interval between each section of stratum is small (for example, 2-5 meters), the produced water of a high-water stratum of a local well section in the shaft still flows to the adjacent stratum structure well section along the shaft annular space through the micro-channel in the continuous packer body when the flowing water quantity is large. That is, there is still a significant cross-flow of produced water in the wellbore, which may not optimize oil recovery.

In particular, the conventional range of use of packing particles is 16-100 mesh (particle size range 0.15-1.18mm), corresponding to a continuous packing body permeability of 20D-300D, even 20D permeability is still high relative to the formation permeability. For example, a 6-in multi-layer vertical well is run in a 3-1/2in water control screen, filled with continuous packer particles with a permeability of 40D, and a 2 meter long continuous packer annulus (i.e., the continuous packer corresponding to the blind section between two screens) has a flow rate of 29 square/day at a production pressure of 1 MPa. And a flow control screen pipe of 5-1/2in is arranged in a certain horizontal well of 8-1/2in, continuous packer particles with the permeability of 20D are filled, and the flow rate of the continuous packer rings of 2 meters in length is 45 square/day under the production pressure difference of 1 MPa. Therefore, even if the continuous packer is adopted for water control, the interlayer axial channeling flow in the annular space of the well casing is still large, and the packing effect is necessary to be further improved.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's defect, provide a simple structure, simple operation, reliability are high, restriction crossflow flow is effectual, do not influence continuous packing body granule simultaneously and can improve the increasing resistance ware and the increasing resistance device of the continuous packing body along the pit shaft axial packing effect in the pit shaft that the production section was filled to and a well completion structure that can improve in the pit shaft continuous packing body along the pit shaft axial packing effect.

In order to achieve the above purpose, the utility model provides a following technical scheme:

a can improve the increasing choke of the axial packing effect of continuous packing body in the pit shaft, the said increasing choke is the cylindrical structure wholly; a central mounting hole for mounting a central pipe column is formed in the axial center of the resistance increasing device; one or more filling channels which are consistent with the axial direction of the cylinder are arranged inside and/or outside the resistance increasing device, and the sum of the effective flow areas of the filling channels is 1/20-1/2 of the cross section area of the cylinder.

Further, the filling channel of resistance increase ware is a plurality of, a plurality of filling channel is based on the axis of cylinder is circumference symmetric distribution.

Furthermore, two ends of the resistor-increasing device are respectively provided with an annular groove communicated with each filling channel, and the annular grooves at the two ends are consistent in size and position relative to the axis of the cylinder; the effective flow guide area of the annular groove is not smaller than the flow area of the single filling channel.

Further, the cross-sectional shape of the filling channel inside the resistance increasing device is one or more of a circle, an ellipse, a sector and a fillet sector.

Further, the cross section of a filling channel on the outer side of the resistance increasing device is in one or more of a semicircular shape, a fan shape and a fillet/chamfer fan shape, and the outer side face of the filling channel is communicated with the annular space of the shaft.

In order to achieve the above object, the utility model also provides the following technical scheme:

the resistance-increasing device capable of improving the axial blocking effect of the continuous blocking body in the shaft comprises the resistance-increasing device and the center pipe column, wherein the center pipe column penetrates through the center mounting hole of the resistance-increasing device and is fixedly connected with the resistance-increasing device.

Furthermore, the resistance increasing device and the central pipe column are connected and fixed in one or more modes of welding, bolt fixing or clamping piece fixing.

Further, the central pipe column is a short-section blind pipe;

furthermore, flow control filter pipe strings are installed at two ends of the short blind pipe.

the utility model provides a can improve continuous packer body axial packer effect's in pit shaft well completion structure, includes a plurality of tubular columns of end to end that set up in the pit shaft, be equipped with continuous packer in the annular space between the wall of a well of tubular column and pit shaft, one or more be equipped with as above on the tubular column of center the resistance augmentor.

a well completion structure capable of improving the axial packing effect of a continuous packing body in a shaft along the shaft comprises a plurality of center pipe columns which are arranged in the shaft in an end-to-end mode, wherein the continuous packing body is arranged in an annular space between the center pipe columns and the wall of the shaft, and one or more center pipe columns are the resistance-increasing devices.

The utility model relates to a can improve and seal in succession and separate body and seal resistance ware and well completion structure that separates effect along the pit shaft axial, firstly through set up the resistance ware that increases that has less open area and fill packing and separate the granule in the pit shaft, can reduce the stratum and produce the cross-flow of water in the pit shaft annular space. Secondly, because the whole annular space is filled with the continuous packer and no space is provided for storing the silt generated by the earthworm holes, the earthworm holes cannot be formed at the two ends of the packer, and the problems of well wall collapse, silt migration and the like cannot be caused. Thirdly, the flow guide grooves are formed in the two ends of the resistance increasing devices, when the resistance increasing devices are used as standard parts in series, the resistance increasing devices can be installed on the central pipe column in series according to actual requirements on site, and the filling channels of the resistance increasing devices are not required to be aligned, so that the field assembly and the use are very convenient, the field installation efficiency can be improved, and the channeling flow of the stratum produced water in a shaft can be more accurately limited.

Drawings

FIG. 1 is a front sectional view of a resistor increasing device for increasing the axial packing effect of a continuous packing body along a shaft in an embodiment of the present invention;

fig. 2 is a left side view of a choke-increasing device for improving the axial packing effect of a continuous packing body along a shaft in an embodiment of the present invention;

fig. 3 is a schematic view of an overall structure of a choke-increasing device for improving the packing effect of a continuous packing body along the axial direction of a shaft in the embodiment of the present invention;

fig. 4 is a sectional view of the overall structure of a choke-increasing device for improving the axial packing effect of a continuous packing body along a shaft in the embodiment of the present invention;

FIG. 5 is a front sectional view of another embodiment of the resistance increasing device for increasing the axial packing effect of the continuous packing along the shaft;

FIG. 6 is a left side view of another embodiment of the present invention of a resistor extender to improve the axial packing effect of a continuous packer along a wellbore;

fig. 7 is a schematic view of an overall structure of another resistance increasing device for improving the axial packing effect of a continuous packing body along a shaft in the embodiment of the present invention;

fig. 8 is a sectional view of another embodiment of the present invention showing the overall structure of the choke-increasing device for increasing the axial packing effect of the continuous packing along the shaft;

fig. 9 is a schematic overall structure diagram of a specific application of the resistance increasing device in the shaft for improving the axial packing effect of the continuous packing body along the shaft in the embodiment of the present invention.

Fig. 10 is a schematic diagram of the overall structure of a conventional injection-production system according to an embodiment of the present invention;

fig. 11 is a schematic diagram of the overall structure of an injection production system using a resistance increasing device for improving the effect of sealing the continuous sealing body along the axial direction of the shaft in the embodiment of the present invention.

Detailed Description

The following describes a specific embodiment of the choke-increasing device and completion structure for improving the axial packing effect of the continuous packing body along the shaft with reference to fig. 1 to 9. It should be noted that the drawings in the specification are only used for visually showing the whole or partial specific features of the technical scheme disclosed in the embodiment, and the proportion or the dimensional structure is not drawn according to the actual product, so that the technical scheme disclosed in the embodiment cannot be limited; the utility model relates to an improve and seal in succession and separate body and seal in the axial of pit shaft and separate realization structure and also not be limited to the description of following embodiment.

Example 1:

the embodiment provides a resistance increasing device capable of improving the axial packing effect of a continuous packing body in a shaft.

As shown in fig. 1 to 8, the resistance increasing device 1 is integrally in a cylindrical structure or an approximately cylindrical structure, and the shape structure is designed to facilitate the resistance increasing device 1 to be put into a shaft 2 after being assembled with a central pipe string as a sleeve structure. The axial center position of the resistance increasing device 1 is provided with a central mounting hole 11 (namely, the central mounting hole 11 of the sleeve structure) for mounting a central pipe column, and one or more filling channels 12 consistent with the axial direction are/is arranged inside and/or outside the resistance increasing device 1; the sum of the effective flow areas of the filling channels 12 is 1/20-1/2 of the cross-sectional area of the cylinder. The effective flow area of the filling channel 12 refers to the cross-sectional area of the filling channel 12. Specifically, in the stage of filling the packing particles, the packing fluid carrying the packing particles mainly flows through the filling channel 12 of the choke 1 and the outer annular space thereof, and the packing particles are conveyed to the deep part of the shaft 2 and gradually accumulated from the deep part of the shaft 2 to the shallow part to form a continuous packing body; during the production phase, the production fluid in the annular space of the shaft 2 is mainly subjected to cross flow through the outer annular space of the choke 1 and the filling channel 12 of the choke 1.

Specifically, the number of the filling channels 12 is at least 1, and may be plural. When the filling channel 12 of the resistor 1 is plural, the plural filling channels 12 are circumferentially symmetrically distributed based on the axis of the cylinder. The resistor 1 may be provided with only the inner filling channel 12 or the outer filling channel 12, but it is also possible to provide both filling channels 12.

As shown in fig. 1-4, the filling channel 12 of the resistor 1 is arranged inside, and the cross section is in the shape of one or more of a circle, an ellipse, a sector and a rounded sector; of course, other similar shapes are possible, but a circular or fan-shaped structure is adopted, so that the processing is convenient, and the resistance to the filling liquid is small.

As shown in fig. 5 to 8, the filling channel 12 of the choke plug 1 is arranged on the outer side, the cross section is in the shape of one or more of a semicircle, a sector, a fillet/chamfer sector, and the outer side of the filling channel 12 is communicated with the annular space of the shaft 2. The fillet/chamfer sector is that two corners close to the axis are in a sector shape, and two corners far away from the axis are in a chamfer shape, so that the resistance to filling liquid can be reduced by the two fillets on the inner side, and the probability of blockage caused by the chamfer on the outer side is in a cambered surface shape during well descending can be reduced. The communication means that the outer side surface of the filling channel 12 is an open structure and is connected with the shaft 2 annulus into a whole, and after filling is finished, an integrated continuous packer can be formed.

Preferably, the two ends of the resistance increasing device 1 are provided with annular grooves 13 communicated with each filling channel 12, and the annular grooves 13 at the two ends have the same size (including the diameter of the ring, the width and the depth of the groove) and the same position relative to the axis of the cylinder (the circle center of the ring is located on the axis). The annular groove 13 is provided for the purpose of selectively determining, on site, a corresponding number of resistor boosters 1 to be used in series, according to the resistance value to be generated, when the prefabricated resistor boosters 1 are used as standard parts. When two or more of the resistance increasing devices 1 are used in series, if the annular groove 13 is not provided, the filling channel 12 of the resistance increasing device 1 needs to be completely aligned and then used, otherwise, the filling channel 12 is blocked and filling fluid cannot be injected into the well bore 2. By arranging the annular grooves 13, the annular grooves 13 of two adjacent resistance increasing devices 1 can form diversion trenches, so that the communication of the filling channels 12 of two adjacent resistance increasing devices 1 is realized. In order to ensure the communication effect, the effective flow guiding area of the annular groove 13 should be no less than the flow area of the single filling channel 12. Specifically, the number of the annular grooves 13 may be one or more, and is determined according to the number and arrangement of the filling channels 12. If the filling channel 12 is arranged in two circles, two annular grooves 13 with different diameters need to be arranged. By arranging the annular groove 13, when a user installs a plurality of resistance increasing devices 1 on a central pipe column (such as a blind pipe), the alignment problem of a flow guide channel is not considered, so that the working efficiency can be improved; meanwhile, through the free combination of the resistance increasing devices 1, the additionally increased resistance value of the produced fluid in the well shaft 2 after the production can be flexibly and accurately set.

If the filling channel 12 is provided only on the outside, as a simplified structure, the annular groove 13 may not be provided, and the annular space outside the choke body 1 is used as a flow guide channel. This embodiment should be considered as an equivalent technical solution to the present embodiment.

Example 2:

the embodiment provides a resistance increasing device capable of improving the axial packing effect of a continuous packing body in a shaft 2.

The resistance increasing device comprises the resistance increasing device 1 and a center pipe column according to embodiment 1, wherein the center pipe column penetrates through a center mounting hole 11 of the resistance increasing device 1 and is fixedly connected with the resistance increasing device 1. Specifically, the resistance increasing device 1 and the central pipe column are connected and fixed through one or more of welding, bolt fixing or clamping piece fixing modes. As an alternative embodiment, the central pipe column is a short blind pipe; of course, the centre string may also be a screen or another type of string, for example with the choke 1 arranged at one or both ends of the screen.

The technical scheme of the embodiment aims to enable the resistance increasing device 1 and the central pipe column to be standard components and to be a standardized resistance increasing device, so that the resistance increasing device can be directly used as a central pipe column with a resistance increasing function for downhole construction without field assembly, and construction operation is facilitated.

Example 3:

this embodiment provides a specific application of the resistor/resistor increasing device described in

embodiment

1 or 2.

(1) Splicing the resistance increasing device 1 with a central pipe column to form a resistance increasing device, or directly splicing the resistance increasing device with other central pipe columns such as sieve pipes 3 and the like into a pipe string according to a preset number and position by adopting a prefabricated resistance increasing device, and then putting the pipe string into a shaft 2;

(2) filling liquid carrying packing particles into the shaft 2 through the annulus of the shaft 2; as shown in fig. 9, the packing fluid carries packing particles to gradually accumulate in the annulus of the shaft 2 from inside to outside to form a continuous packing body 4; the continuous packer 4 is filled with a filling channel 12 of the resistance increasing device and an outer annular empty area of the resistance increasing device;

(3) putting into production; the production fluid and the produced water in the annulus of the wellbore 2 are subjected to a cross-flow in the annulus, and when passing through the zone where the resistor/resistor increasing device is located, the resistance received is greater than that in the zone where the resistor/resistor increasing device is not located, due to the smaller effective flow area of the filling channel 12, and thus the cross-flow rate is smaller.

For example, a flow control screen pipe of 5-1/2in is put into a horizontal well of 8-1/2in, continuous packer particles with the permeability of 20D are filled, and the continuous packer channeling rate corresponding to a blind section between two screen pipes is 45 square/day under the production pressure difference of 1 MPa. After the 8-1/2in horizontal well is applied to the resistance increasing device, the flow rate of the continuous packer corresponding to the blind section between the two sieve tubes is 15 square/day.

Example 4:

this embodiment shows another specific application of the resistor/resistor increasing device described in

embodiment

1 or 2.

As shown in fig. 10, is an injection-production system comprising a water injection well M1 and a production well M2. It can be seen from the figure that, due to the higher permeability of the formation at C, more driving fluid (usually formation water, indicated by a black bold line in the figure) injected into the water injection well M1 enters the production well M2 through the formation at C, which results in a higher water content in the production fluid of the production well M2, and in that the driving fluid at A, B, D, E in the wellbore partially flows into C due to the channeling of the driving fluid in the wellbore, resulting in a lower driving fluid pressure in the formation at A, B, D, E and a lower oil recovery efficiency. Therefore, the work efficiency of the injection-production system cannot be optimized.

As shown in fig. 11, a completion is formed in the injection well M1 according to the method described in example 3. After the injection, the channeling of the driving liquid injected into the water injection well M1 through the central column in the annular space of the shaft 2 is reduced, the driving liquid in the annular space at A, B, D, E cannot (or less) crossflow to the annular space at C, so that the driving liquid cannot enter the stratum at C, and as a result, the content of water in the production liquid in the stratum at C in the oil production well M2 is reduced, and the driving liquid pressure in the stratum at A, B, D, E is increased, so that the oil displacement effect is enhanced, the oil production amount of the corresponding stratum is increased, and the oil recovery rate of the injection and production system is optimized.

Example 5:

the embodiment provides a well completion structure capable of improving the axial packing effect of a continuous packing body in a shaft, which comprises a plurality of center pipe columns arranged in the shaft in an end-to-end manner, wherein flow control filter pipe strings are arranged at two ends of each center pipe column 4. And a continuous packer is arranged in an annular space between the central pipe column and the well wall of the shaft. The difference from the prior art is that: in the completion configuration, the choke plug of embodiment 1 is on the one or more of the central strings; alternatively, the one or more centerpipe strings are the friction enhancing devices of embodiment 2. It should be noted that the well completion structure provided in this embodiment is applicable not only to a production well, but also to a water injection well.

In this embodiment, through setting up the resistance-increasing device that has less area of overflowing/resistance-increasing, resistance when can increase the production fluid drunkenness in the pit shaft annular space to reduce the drunkenness of producing formation produced water in the pit shaft annular space, improve the whole oil recovery rate of oil well.

The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims

1. The utility model provides an improve and pack in succession and separate the ware that increases of axial packing effect of body which characterized in that: the resistor-increasing device is integrally of a cylindrical structure; a central mounting hole for mounting a central pipe column is formed in the axial center of the resistance increasing device; one or more filling channels which are consistent with the axial direction of the cylinder are arranged inside and/or outside the resistor-increasing device, and the sum of effective flow areas of the filling channels is 1/20-1/2 of the cross section area of the cylinder.

2. The resistance increasing device for improving the axial packing effect of the continuous packing body according to claim 1, wherein: the filling channels of the resistor-increasing device are distributed in a circumferential symmetry mode based on the axis of the cylinder.

3. The resistor extender for improving the axial packing effect of a continuous packing body according to claim 2, wherein: annular grooves communicated with each filling channel are formed in the two ends of the resistor-increasing device, the sizes of the annular grooves at the two ends are consistent, and the positions of the annular grooves relative to the axis of the cylinder are consistent; the effective flow guide area of the annular groove is not smaller than the flow area of the single filling channel.

4. The resistance increasing device for improving the axial packing effect of the continuous packing body according to claim 1, wherein: the cross section of the filling channel inside the resistance increasing device is in one or more of a circle, an ellipse, a sector and a fillet sector.

5. The resistance increasing device for improving the axial packing effect of the continuous packing body according to claim 1, wherein: the cross section of the filling channel at the outer side of the resistor-increasing device is in one or more of a semicircular shape, a fan shape and a fillet/chamfer fan shape.

6. The utility model provides an improve and seal that separates axial seal of body and separate device that increases of effect which characterized in that: the flow control device comprises the resistor increasing device as claimed in any one of claims 1 to 5 and a center pipe column, wherein the center pipe column penetrates through a center mounting hole of the resistor increasing device and is fixedly connected with the resistor increasing device.

7. The resistance-increasing device for improving the axial packing effect of the continuous packing body according to claim 6, wherein: the resistance increasing device and the central pipe column are connected and fixed through one or more of welding, bolt fixing or clamping piece fixing modes.

8. The resistance-increasing device for improving the axial packing effect of the continuous packing body according to claim 6, wherein: the central pipe column is a short blind pipe.

9. The utility model provides an improve well completion structure of continuous packer body axial packing effect, includes a plurality of tubular center posts of end to end that set up in the pit shaft, be equipped with continuous packer in the annular space between the wall of a well of tubular center post and pit shaft, its characterized in that: the one or more of the center pipe strings are provided with the resistance increasing device as claimed in any one of claims 1 to 5.

10. The utility model provides an improve well completion structure of continuous packer body axial packing effect, includes a plurality of tubular center posts of end to end that set up in the pit shaft, be equipped with continuous packer in the annular space between the wall of a well of tubular center post and pit shaft, its characterized in that: the one or more central strings are the friction increasing device of any one of claims 6 to 8.