WO2017045131A1

WO2017045131A1 - Water control tubular column and automatic inflow control restrictor thereof, and inflow control device

Info

Publication number: WO2017045131A1
Application number: PCT/CN2015/089642
Authority: WO
Inventors: 易会安; 易齐尊; 王振祥; 陈善饮; 李伯仁; 刘妙仁; 孟祥芹
Original assignee: 思达斯易能源技术(集团)有限公司
Priority date: 2015-09-15
Filing date: 2015-09-15
Publication date: 2017-03-23
Also published as: CN108138557B; CN108138557A

Abstract

A water control tubular column and an automatic inflow control restrictor (33) thereof, and an inflow control device (3). The water control tubular column comprises the inflow control device (3). The inflow control device (3) comprises a central tube (32), an outer protection sleeve (31), and the automatic inflow control restrictor (33). An annular space (34) used for allowing the liquid to circulate is formed between the outer protection sleeve (31) and the outer wall of the central tube (32). The outer protection sleeve (31) comprises a filtering portion (314) and a flow restriction portion (315). A filtering mechanism (313) is disposed on the sleeve body wall of the filtering portion (314). The automatic inflow control restrictor (33) is mounted on the tube wall of the central tube (32), and comprises a hollow inner cylinder (3312), an outer cylinder (3311), an upper cover (3313), a lower cover (333) and a float (332) that are coaxially disposed. A central hole of the inner cylinder (3312) is a fluid inflow hole (335). The lower cover (333) is detachably connected to the lower end of the outer cylinder (3311); and the lower cover (333), the upper cover (3313) and the outer cylinder (3311) jointly form an accommodating space (336) in a surrounding manner. A fluid outflow hole (334) is formed in the lower cover (333), and a gap used for allowing the liquid to circulate is formed between the inner surface of the lower cover (333) and the bottom end surface of the inner cylinder (3312). The float (332) movably sleeves outside the inner cylinder (3312) and can freely move alone the axis of the inner cylinder (3312). By means of the water control tubular column and the intelligent inflow control device, passive water control is changed into active water control, and the traffic of the liquid is automatically controlled according to the density of the liquid, thereby achieving the effect of controlling water and stabilizing oil.

Description

Water control column and automatic inflow control restrictor and inflow control device

Technical field

The invention relates to a horizontal well water control technology for oil and gas fields, in particular to a water control column and an automatic inflow control restrictor and an inflow control device.

Background technique

Horizontal wells have been developed and applied due to their high liquid production, small production pressure difference and low flow resistance. Horizontal wells have the characteristics of unbalanced flow production fluid profiles. With the extension of mining time, this unbalanced flow profile will lead to premature water seepage, reduce well life and affect well productivity.

The existing horizontal well water control technology generally adopts the method of first finding water and then controlling water, but this method is carried out under the production state, the construction process is complicated, the technical requirements are high, the process is many, and the operation is difficult. Moreover, the water control methods used are mostly passive water control, and these water control methods will fail in the event of water coning.

Invention disclosure

The technical problem to be solved by the present invention is to provide a water control column and an automatic inflow control restrictor and an inflow control device thereof, which can automatically control the flow rate of the fluid according to the fluid characteristics and balance the inflow profile to realize the above-mentioned defects of the prior art. Simple, easy to operate, active water control, stable oil production.

To achieve the above object, the present invention provides an automatic inflow control current limiter, which comprises:

The body includes a hollow inner cylinder, an outer cylinder and an upper cover. The inner cylinder and the outer cylinder are coaxially disposed on the upper cover, and a central hole of the inner cylinder is a fluid inflow hole, and an outer circumference of the outer cylinder Threads for connection are provided on the surface;

The lower cover is detachably connected to the lower end of the outer cylinder, and is combined with the upper cover and the outer cylinder to form an accommodating space, the inner cylinder is located in the accommodating space, and the lower cover is a fluid outflow hole is provided, and a gap for liquid circulation is provided between an inner surface of the lower cover and a bottom end surface of the inner cylinder;

a pontoon disposed in the accommodating space, comprising an end cap and a sleeve connected to each other, the sleeve being movably disposed outside the inner cylinder and freely movable along an axis of the inner cylinder, the end cap being parallel The upper cover is located at an end of the sleeve adjacent to the lower cover.

The automatic inflow control restrictor described above, wherein the gap is equal to a maximum displacement of the buoy from.

The automatic inflow control restrictor described above, wherein a surface of the upper cover opposite to the outer cylinder is provided with a tool fixing hole for mounting or dismounting.

The automatic inflow control restrictor described above, wherein the tool fixing hole is a countersunk head blind hole.

The automatic inflow control restrictor described above, wherein the upper cover, the inner cylinder and the outer cylinder are integrally formed.

In order to better achieve the above object, the present invention also provides an inflow control device, which includes:

The central tube is a hollow cylindrical tube;

An outer sheath comprising an interconnected sleeve and two sets of ends, the outer sheath being fitted over the central tube by the two sets of ends and disposed coaxially with the central tube, the sleeve and the An annular space for liquid circulation between the outer walls of the central tube, the sleeve body comprising a filter portion and a flow restricting portion, the filter body having a filter mechanism disposed thereon;

An automatic inflow control restrictor, the automatic inflow control restrictor according to any one of claims 1 to 5, mounted on a pipe wall of the center pipe, the pipe wall of the center pipe corresponding to the The flow restricting portions are staggered with a plurality of mounting holes through which the liquid flowing into the annular space enters the central pipe through the automatic inflow control restrictor, and the automatic inflow control restrictor automatically adjusts the inflow according to the output of the oil and gas well The fluid flow of the central tube.

In the above-described inflow control device, wherein the mounting hole is a threaded hole, and the automatic inflow control restrictor is connected to the mounting hole through a thread of the outer cylinder, and a sealing structure is disposed on an outer edge of the upper cover .

In the above-mentioned inflow control device, wherein the filter mechanism is a double-layer sand control filter structure, and the outer layer of the sleeve wall of the filter portion is provided with a sand control filter mesh with a sand filter groove, and the filter body is inside the sleeve wall The layer is provided with a multi-layer metal fiber dense screen.

In order to better achieve the above object, the present invention also provides a water control column for water control and oil stabilization production of a horizontal well, including:

a main column installed in the oil well string of the horizontal well, wherein the oil well string and the annular space of the main column are provided with an expansion packer;

At least one set of inflow control water pipe columns comprising sequentially connected inflow control devices, screens and blind tubes, said inflow control device being coupled to said main column, said inflow control device being in accordance with claims 6-8 above The inflow control device according to any one of the preceding claims.

In the above-mentioned water control column, the inflow control water pipe column is a plurality of groups connected in series, and each group of the plurality of sets of the blind pipe flowing into the water control pipe column and the oil well pipe column are provided with an expansion packer.

The invention is described in detail below with reference to the accompanying drawings and specific embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS

1 is a schematic view of a water control column according to an embodiment of the present invention;

2 is a schematic structural view of an inflow control device according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of an automatic inflow control current limiter according to an embodiment of the present invention.

Where the reference number

1 main column

2 expansion packer

3 inflow control device

31 outer sheath

311 housing

312 sets of ends

313 filter mechanism

314 Filter Department

315 current limiter

32 center tube

33 automatic inflow control current limiter

331 ontology

3311 outer cylinder

3312 inner cylinder

3313 top cover

3314 tool fixing hole

332 float

333 lower cover

334 outflow hole

335 inflow hole

336 accommodation space

34 annular space

4 screen

5 blind tube

10 oil well tubular string

The best way to implement the invention

The structural principle and working principle of the present invention will be specifically described below with reference to the accompanying drawings:

Referring to FIG. 1, FIG. 1 is a schematic diagram of a water control column according to an embodiment of the present invention. The water control pipe column of the present invention is used for automatic regulating water control and oil stabilization production of horizontal wells, comprising: a main pipe column 1 installed in an oil well pipe string 10 of a horizontal well, the oil well pipe string 10 and the main pipe column An expansion packer 2 is disposed in the annulus of the air; and at least one set of inflow control water pipe columns includes a flow control device 3, a screen 4 and a blind pipe 5 which are sequentially connected, and the inflow control device 3 and the main pipe 1 connection, in this embodiment, the inflow control water pipe column can be set as a plurality of groups connected in sequence according to actual production conditions, and each group of the plurality of groups of the blind pipe 5 flowing into the water control pipe column and the oil well pipe column 10 Both are provided with an expansion packer 2. Since the other components, structures, positional relationships, connection relationships, and functions of the water control column are relatively mature prior art, the details are not described herein. Only the inflow control device 3 of the present invention and Its automatic inflow control restrictor 33 will be described in detail.

Referring to FIG. 2, FIG. 2 is a schematic structural diagram of an inflow control device according to an embodiment of the present invention. The inflow control device 3 of the present invention comprises: a central tube 32 which is a hollow cylindrical tube; an outer sheath 31 comprising an interconnected sleeve body 311 and two sets of ends 312 through which the outer sheath 31 passes a set 312 is fixed to the central tube 32 and disposed coaxially with the central tube 32. For example, the outer sheath 31 can be welded to the central tube 32 through two sets of ends 312, the sleeve 311 and the An annular space 34 for liquid circulation is provided between the outer walls of the central tube 32. The fluid flows through the filtering mechanism 313 on the outer sheath 31 and flows into the annular space 34. The casing 311 includes a filtering portion 314 and a restricting portion 315. The filtering mechanism 313 is disposed on the sleeve wall of the filter portion 314 to form a sand control filter channel of the automatic water control current limiting device. In the embodiment, the filter mechanism 313 is preferably a double sand control filter structure. The outer layer of the sleeve wall of the portion 314 is provided with a sand control filter screen with a sand filter groove, and the inner wall of the sleeve portion of the filter portion 314 is provided with a plurality of metal fiber dense mesh screens, which can filter out fine sand particles in the fluid and prevent Sand inflow And an automatic inflow control restrictor 33 is mounted on the wall of the central pipe 32, and a plurality of mounting holes are interleaved correspondingly to the restricting portion 315 on the pipe wall of the central pipe 32. The liquid in the annulus 34 enters the central tube 32 through the automatic inflow control restrictor 33, which automatically regulates the flow of fluid into the central tube 32 based on the production of the well. In this embodiment, the mounting hole is preferably a threaded hole, and the automatic inflow control restrictor 33 is connected to the mounting hole through a thread of the outer cylinder 3311, and the outer cover of the upper cover 3313 is provided with a seal. A structure, such as a sealing groove, in which a sealing gasket is mounted.

Referring to FIG. 3, FIG. 3 is a schematic structural diagram of an automatic inflow control current limiter according to an embodiment of the present invention. The Autonomous Inflow Control Device (AICD) of the present invention comprises: a body 331, comprising a hollow inner cylinder 3312, an outer cylinder 3311 and an upper cover 3313, the inner cylinder 3312 and the outer cylinder 3311. Coaxially disposed on the upper cover 3313, the central hole of the inner cylinder 3312 is a fluid inflow hole 335, the outer circumferential surface of the outer cylinder 3311 is provided with a thread for connection; the lower cover 333, and the outer The lower end of the cylinder 3311 is detachably connected, and is combined with the upper cover 3313 and the outer cylinder 3311 to form an accommodating space 336. The inner cylinder 3312 is located in the accommodating space 336. a fluid outflow hole 334 is provided, a gap between the inner surface of the lower cover 333 and the bottom end surface of the inner cylinder 3312 for liquid circulation; and a float 332 disposed in the accommodation space 336, including each other An end cap and a sleeve, the sleeve being movably disposed outside the inner cylinder 3312 and freely movable along an axis of the inner cylinder 3312, the end cap being parallel to the upper cover 3313 and located in the sleeve The tube is close to one end of the lower cover 333

Wherein, the gap is preferably equal to the maximum displacement distance of the pontoon 332, that is, the bottom surface of the end cap of the pontoon 332 is flush with the end surface of the inner cylinder 3312, and the sleeve length of the pontoon 332 is equal to the height of the inner cylinder 3312. In addition, a surface of the upper cover 3313 opposite to the outer cylinder 3311 is provided with a tool fixing hole 3314 for mounting or dismounting, and the tool fixing hole 3314 is preferably a countersunk blind hole. The upper cover 3313, the inner cylinder 3312, and the outer cylinder 3311 are preferably integrally formed.

According to the geological characteristics of the reservoir and the water outflow of the oil well, the water control software can be used to calculate the number of water control current limiting devices required for a certain interval, and the position and quantity of the screen 4, the blind pipe 5, and the inflow control device 3 are arranged. According to the installation position and the number of installations of the automatic inflow control restrictor 33 calculated by the water control process software, the position and the number of the mounting holes on the center tube 32 are correspondingly set, and the inflow control device 3 is assembled, and then the water control column is installed, that is, the main column is to be 1. The expansion packer 2, the inflow control device 3, the blind tube 5 and the screen tube 4 are connected and lowered into the oil well string 10 to complete the construction of the water control process in an optimized manner.

The inflow control device 3 of the present invention is connected to the water control pipe column of the horizontal well, and the fluid in the formation passes through the sand control filter mechanism 313 on the outer outer sheath 31 to filter out the fine sand particles, and the fluid flows into the outer sheath 31 and the center pipe. In the annular space 34 of 32, when the fluid flows to the automatic inflow control restrictor 33 (AICD), the inflow hole 335 is provided in the automatic inflow control restrictor 33, and the fluid flows through the inflow hole 335 on the inner cylinder 3312 to The automatic inflow control restrictor 33 has an internal accommodating space 336, and the automatic inflow control restrictor 33 has different control effects on fluids of different densities and different viscosities. When the mixed fluid is injected into the automatic control flow restrictor 33, the density thereof The small, high viscosity oil will cause the float 332 to float, so that the outflow holes 334 on the lower cover 333 are all in the maximum open state, and the fluid flows smoothly; and the water in the mixed fluid causes the float 332 to sink and the lower cover 333 to flow out. The hole 334 is in the minimum open state, and most of the fluid cannot pass smoothly, so the oil with low density and high viscosity flows into the center tube 32 from the outflow hole 334 on the lower cover 333, and is collected to the ground by lifting. . The automatic inflow control restrictor 33 can automatically "open source" the inflow of oil, and "throttle" the inflow of water, thereby functioning to stabilize the oil and control the water.

The invention has the advantages of simple structure, good processability, simple and high-efficiency construction, can effectively play the role of sand control, water control and oil stabilization, balance the liquid production profile, realize automatic steady oil control water production, and change the passive water control situation. The water control is changed from passive control to active regulation. At the same time, the inflow control device filters the fluid through the layer and then flows into the automatic inflow control restrictor, reducing the possibility of sand blockage and solving the horizontal well of the prior art. The problem of bottom water coning and even flooding occurred during the development process.

The invention may, of course, be embodied in a variety of other embodiments without departing from the spirit and scope of the invention. Changes and modifications are intended to be included within the scope of the appended claims.

Industrial applicability

The invention is an active water control mode, and the passive water control is changed into active water control through a simple water control column and a smart inflow control device, and the flow rate of the liquid is automatically controlled according to the viscosity and density of the liquid, thereby realizing the oil. Open source and throttling of water. The beneficial effects are as follows:

(1) The automatic inflow control restrictor of the invention is an automatic water control device, and can automatically realize the flow control according to the performance characteristics such as the viscosity and density of the fluid without any power and manual intervention, and the "open source" viscosity is large. a fluid with a low density, a "throttle" fluid having a small viscosity and a high density;

(2) The water control pipe column of the invention has a simple structure, is convenient for running in and out, and can control the flow of the production layer, equalize the flow profile and increase the oil production amount by entering the well once;

(3) The method for determining the installation position and the number of installations of the AICD current limiting device and the method for arranging the connection mode of the pipe string, according to the characteristics of the reservoir, the exact arrangement of the number and position of the AIDC current limiting device is automatically calculated by the software. In order to achieve the purpose of inhibiting high aquifer production, reducing water content, and improving oil efficiency.

Claims

An automatic inflow control flow restrictor, comprising:

The body includes a hollow inner cylinder, an outer cylinder and an upper cover. The inner cylinder and the outer cylinder are coaxially disposed on the upper cover, and a central hole of the inner cylinder is a fluid inflow hole, and an outer circumference of the outer cylinder Threads for connection are provided on the surface;

The lower cover is detachably connected to the lower end of the outer cylinder, and is combined with the upper cover and the outer cylinder to form an accommodating space, the inner cylinder is located in the accommodating space, and the lower cover is a fluid outflow hole is provided, and a gap for liquid circulation is provided between an inner surface of the lower cover and a bottom end surface of the inner cylinder;

a pontoon disposed in the accommodating space, comprising an end cap and a sleeve connected to each other, the sleeve being movably disposed outside the inner cylinder and freely movable along an axis of the inner cylinder, the end cap being parallel The upper cover is located at an end of the sleeve adjacent to the lower cover.
The automatic inflow control flow restrictor of claim 1 wherein said gap is equal to a maximum displacement distance of said pontoon.
The automatic inflow control restrictor according to claim 1 or 2, wherein a surface of the upper cover opposite to the outer cylinder is provided with a tool fixing hole for mounting or detaching.
The automatic inflow control restrictor of claim 3, wherein the tool fixing hole is a countersunk blind hole.
The automatic inflow control flow restrictor according to claim 1, 2 or 4, wherein said upper cover, inner cylinder and said outer cylinder are integrally formed.
An inflow control device, comprising:

The central tube is a hollow cylindrical tube;

An outer sheath comprising an interconnected sleeve and two sets of ends, the outer sheath being fitted over the central tube by the two sets of ends and disposed coaxially with the central tube, the sleeve and the An annular space for liquid circulation between the outer walls of the central tube, the sleeve body comprising a filter portion and a flow restricting portion, the filter body having a filter mechanism disposed thereon;

An automatic inflow control restrictor, the automatic inflow control restrictor according to any one of claims 1 to 5, mounted on a pipe wall of the center pipe, the pipe wall of the center pipe corresponding to the The flow restricting portions are staggered with a plurality of mounting holes through which the liquid flowing into the annular space passes through the automatic inflow control limit The flow device enters the central tube, and the automatic inflow control flow restrictor automatically adjusts the flow of fluid into the central tube based on the production of the oil and gas well.
The inflow control device according to claim 6, wherein said mounting hole is a threaded hole, and said automatic inflow control restrictor is connected to said mounting hole through a thread of said outer cylinder, said upper cover A sealing structure is provided on the outer edge.
The inflow control device according to claim 6 or 7, wherein the filter mechanism is a double-layer sand control filter structure, and the outer layer of the sleeve wall of the filter portion is provided with a sand control filter mesh with a sand filter groove. A plurality of metal fiber dense screens are disposed on the inner layer of the sleeve wall of the filter portion.
A water control water column for water control and oil stabilization production of a horizontal well, comprising:

a main column installed in the oil well string of the horizontal well, wherein the oil well string and the annular space of the main column are provided with an expansion packer;

At least one set of inflow control water pipe columns comprising sequentially connected inflow control devices, screens and blind tubes, said inflow control device being coupled to said main column, said inflow control device being any one of claims 6-8 above The inflow control device.
The water control pipe column according to claim 9, wherein the inflow control water pipe column is a plurality of groups connected in series, and each group of the plurality of sets of blind pipes flowing into the water control pipe column and the oil well pipe string are An expansion packer is provided.