CN105756628B - A kind of control water current-limiting apparatus - Google Patents

Abstract

A water control and flow limiting device, the water control and flow limiting device includes: a base pipe, the pipe wall is respectively provided with an oil flow groove and a water flow hole, the oil flow groove is close to the inlet end of the base pipe, the The water flow hole is close to the outlet end of the base pipe; the outer sheath is sleeved outside the base pipe, the outer sheath is coaxially arranged with the base pipe, and there is an annular space between the outer sheath and the base pipe, The front end of the outer sheath is provided with a double-layer sand filter groove and a sand control filter; the self-adaptive controller is set in the annular space corresponding to the oil flow groove and the water flow hole, and has oil flow channels and water flow holes respectively. The water flow channel is used to control the flow of oil and water, and the adaptive regulator has an initial position and a working position respectively relative to the oil flow tank; and a flow controller is installed on the base pipe corresponding to the adaptive regulator The inlet end of the oil well is connected with the outer sheath to adjust the inflow of oil well fluid according to the production of the oil well, so as to realize self-adaptive flow regulation.

Description

A water control device

technical field

The invention relates to a water control and flow limiting device in the field of petroleum and natural gas exploitation, in particular to an adaptive composite water control and flow limiting device.

Background technique

The exploitable intervals of oil and gas wells are long, especially in long horizontal well intervals. Due to the uneven distribution of oil and gas reservoirs, uneven production intervals are produced. After a period of exploitation, due to the influence of geological and fluid factors, it is easy to This causes water outflow in the wellbore, and effective water control is necessary to achieve balanced production in all horizontal production intervals. Researches on water control in oilfields emerge in endlessly, which are mainly summarized as two types of water control using the flow-limiting mechanism and water control using the friction mechanism. Devices using these two mechanisms for water control have been used in oilfields. During the use, it was found that The flow-limiting mechanism of water control is prone to corrosion and clogging; the friction mechanism of water control is sensitive to changes in fluid viscosity, resulting in poor usability.

Contents of the invention

The technical problem to be solved by the present invention is to provide a water control and flow limiting device for the above-mentioned defects of the prior art, which can automatically adjust the flow and control the water, and overcome the problem that the passive water control cannot be adjusted according to the change of the reservoir conditions.

In order to achieve the above object, the present invention provides a water control and flow limiting device, which includes:

The base pipe has an oil flow groove and a water flow hole respectively arranged on the pipe wall, the oil flow groove is close to the inlet end of the base pipe, and the water flow hole is close to the outlet end of the base pipe;

The outer sheath is set outside the base pipe, the outer sheath is arranged coaxially with the base pipe, and there is an annular space between the outer sheath and the base pipe; the front end of the outer sheath is arranged There are double-layer sand filter grooves and sand control filter screens;

The adaptive controller is arranged in the annular space corresponding to the oil flow groove and the water flow hole, and has an oil flow channel and a water flow channel corresponding to the oil flow groove and the water flow hole respectively. The oil and water are divided and regulated, and the self-adaptive regulator has an initial position and a working position respectively relative to the oil flow tank; and

A flow controller, corresponding to the self-adaptive regulator, is installed at the inlet end of the base pipe and connected with the outer sheath, and is used to adjust the inflow of the oil well fluid according to the production of the oil well, so as to realize self-adaptive flow regulation.

The above-mentioned water control and current limiting device, wherein the self-adaptive controller includes:

A medium selector, set between the base pipe and the outer sheath, is arranged corresponding to the oil passage groove and has an initial position and a working position respectively relative to the oil passage groove, and the medium selector a device divides the oil flow passage and the water flow passage in the annular space;

an elastic reset member, installed on the base pipe and against the medium selector, for the reset of the medium selector from the working position to the initial position; and

A water flow decelerator is installed on the base pipe corresponding to the water flow hole, and is used for restricting and decelerating the water flow passing through the medium selector.

The above-mentioned water control and current limiting device, wherein, the elastic return member includes a spring and a spring baffle, and the spring and the spring baffle are respectively set on the base pipe, and the two ends of the spring respectively abut against the spring bezel and the media selector.

The above-mentioned water control and flow limiting device, wherein the water flow reducer is a plurality of swirl plates or swirl columns arranged in a staggered manner, and the swirl plates or swirl columns are respectively staggeredly installed on the outer circumferential surface of the base pipe and on the inner wall of the outer sheath.

The above water control and flow limiting device, wherein the flow controller includes:

The decompression deceleration disc has an annular groove structure, and the annular groove of the decompression deceleration disc is provided with flow holes, and the decompression deceleration disc is arranged at the front end of the base pipe;

a support deflector, which is installed on the base pipe corresponding to the viscosity control valve and connected to the outer sheath, and a plurality of flow holes are arranged on the surface of the support deflector; and

An equalizing plate is installed on the base pipe corresponding to the supporting baffle and can rotate relative to the supporting baffle, and a plurality of baffles are arranged on the equalizing plate corresponding to the flow holes, Rotating the balance plate adjusts the alignment number of the flow guide hole and the flow hole of the support guide plate to adjust the inflow of the oil well liquid to realize adaptive flow regulation.

In the above-mentioned water control and flow limiting device, an adjusting disc is arranged on the supporting deflector plate and/or the equalizing plate.

Technical effect of the present invention is:

The water control and flow limiting device of the present invention can be installed on the screen pipe, also can be installed on the blind pipe, or even on the oil pipe, through the flow limiting mechanism and the use of fluid viscosity characteristics to achieve effective flow limiting of oil and water, and can be carried out according to the characteristics of the oil reservoir. Inflow adjustment, while automatically selecting oil and water to set different flow channels, so that oil and water can be efficiently divided and controlled, the number of inflow holes can be automatically adjusted according to the production of oil wells, and different numbers of inflow channels are opened for low-production wells and high-production wells , to realize self-adaptive flow regulation; the formation fluid flows into the self-adaptive composite water control and flow limiting device after being filtered by the screen tube for sand control, so as to realize water limitation and stable oil production. The present invention avoids the defect of relying solely on the flow-limiting mechanism or the friction mechanism in the prior art for water control, comprehensively utilizes the flow-limiting mechanism and the friction mechanism to automatically adjust the flow and control water, and solves the problem that the passive water control cannot be changed according to the reservoir conditions The problem of making adjustments.

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

Description of drawings

Fig. 1 is a schematic diagram of pipe string installation according to an embodiment of the present invention;

Fig. 2 is a schematic structural diagram (initial position) of a water control and flow limiting device according to an embodiment of the present invention;

Fig. 3 is a schematic structural diagram (working position) of a water control and flow limiting device according to an embodiment of the present invention.

Among them, reference signs

1 Long horizontal well section

2 sand control water control screen

3 Packers

4 Water control and flow limiting device

41 base tube

411 oil flow tank

412 Water flow hole

42 outer sheath

421 double-layer sand filter groove

422 sand filter

43 Annulus

44 Adaptive Governor

441 Media selector

442 elastic reset

4421 Spring

4422 Spring baffle

443 Water flow reducer

444 Oil Flow Channels

445 water flow channel

45 flow controller

451 Support deflector

4511 Flow holes

452 Balance plate

4512 diversion hole

453 Adjustment dial

454 pressure reduction disc

Detailed ways

Below in conjunction with accompanying drawing, structural principle and working principle of the present invention are specifically described:

Referring to Fig. 1, Fig. 1 is a schematic diagram of pipe string installation according to an embodiment of the present invention. The water control and flow limiting device of the present invention can be installed on the screen, or it can be installed on the blind pipe, or even on the oil pipe. In this embodiment, the sand control and water control screen 2 is taken as an example, and it is installed in a long horizontal well for oil and gas exploitation. Section 1, each end of the sand control and water control screen 2 is equipped with a water control and flow limiting device 4 . Because the composition, structure, working principle, connection or installation method of other parts of the sand control and water control screen 2, and the structure, installation method and function of the packer 3 are relatively mature prior art, the water control limit of the present invention The installation of the flow device 4 on other such as blind pipes and oil pipes is similar to the installation on the sand control and water control screen 2, so it will not be repeated here. Only the water control and flow limiting device 4 of the present invention will be described in detail below.

Referring to Fig. 2 and Fig. 3, Fig. 2 is a schematic structural diagram (initial position) of the water control and current limiting device 4 according to an embodiment of the present invention, and Fig. 3 is a structural schematic diagram (working position) of the water control and current limiting device 4 according to an embodiment of the present invention . The water control and flow limiting device 4 of the present invention is installed on the sand control water control screen 2, comprising:

The base pipe 41 is provided with an oil flow groove 411 and a water flow hole 412 respectively on the pipe wall, the oil flow groove 411 is close to the inlet end of the base pipe 41, and the water flow hole 412 is close to the The outlet end of the base pipe 41, wherein the number of oil inflow holes is adaptively adjusted by the flow in the outer sheath 42 and the annular space 43 of the base pipe 41, so that the oil inflow holes of high-yield wells release more and the oil inflow of low-yield wells The hole release is less, the water flow hole 412 at the rear end of the base pipe 41 is set under the swirl plate, the hole diameter is small, and the number of holes is small; the oil flow groove 411 at the middle end of the base pipe 41 is set above the maximum compression position of the medium selector 441 ;

The outer sheath 42 is sleeved outside the base pipe 41, the outer sheath 42 is arranged coaxially with the base pipe 41, and there is an annular space 43 between the outer sheath 42 and the base pipe 41, The front end of the outer sheath 42 is provided with a double-layer sand filter groove 421 and a sand control filter 422;

The adaptive regulator 44 is arranged in the annular space 43 corresponding to the oil passage groove 411 and the water passage hole 412, that is, the adaptive regulator 44 is arranged on the outer sheath 42 at the rear of the flow controller 45 In the annular space 43 of the base pipe 41, there are oil flow passages 444 and water flow passages 445 respectively corresponding to the oil passage groove 411 and the water passage hole 412, and oil and water are divided and controlled, and the self-adaptive Regulator 44 respectively has an initial position (see FIG. 2 ) and a working position (see FIG. 3 ) relative to the oil flow groove 411 ; and

A flow controller 45, corresponding to the adaptive regulator 44, is installed at the inlet end of the base pipe 41 and connected to the outer sheath 42, and is used to adjust the inflow of the oil well fluid according to the production of the oil well, so as to realize the self-adaptive flow regulation.

Wherein, the adaptive controller 44 includes:

A medium selector 441 is set between the base pipe 41 and the outer sheath 42. The medium selector 441 can be, for example, a viscosity selection valve, which is arranged corresponding to the oil flow groove 411 and opposite to the The oil flow groove 411 has an initial position and a working position respectively. A filter sand tank is provided on the circumference of the lower end of the medium selector 441. The valve core of the medium selector 441 is a hydrophilic and oleophobic medium. Has a thin sheath;

an elastic return member 442, installed on the base pipe 41 and against the medium selector 441, for the return of the medium selector 441 from the working position to the initial position; and

The water flow decelerator 443 is installed on the base pipe 41 corresponding to the water passage hole 412 , and is used for restricting and decelerating the water flow passing through the medium selector 441 .

In this embodiment, the elastic return member 442 includes a spring 4421 and a spring baffle 4422, the spring 4421 and the spring baffle 4422 are respectively sleeved on the base tube 41, and the two ends of the spring 4421 respectively abut against On the spring baffle 4422 and the medium selector 441, the spring baffle 4422 can be three or four pieces uniformly distributed on the circumference, and the middle part of the spring baffle 4422 can be provided with a filter sand tank.

In this embodiment, the water flow reducer 443 is a plurality of staggered swirl plates or swirl columns, and the swirl plates or swirl columns are respectively staggeredly installed on the outer circumferential surface of the base pipe 41 and the On the inner wall of the outer sheath 42. For example, a part of the swirl plate is arranged inside the outer sheath 42, and a part is arranged on the outer circumference of the center tube. gap, the swirl plate surrounds the inner and outer circumferences at least three times respectively.

Wherein, the flow controller 45 is arranged at the front end of the outer sheath 42, including:

The step-down deceleration disc 454 is a disc with an annular groove structure, and the annular groove of the decompression deceleration disc 454 is provided with flow holes, and the decompression deceleration disc 454 is arranged at the front end of the base pipe 41;

The support deflector 451 is installed on the base pipe 41 corresponding to the viscosity control valve and connected to the outer sheath 42, and a plurality of flow holes 4511 are arranged on the surface of the support deflector 451, For example, the supporting deflector 451 is arranged in the annular space 43 between the outer sheath 42 and the base pipe 41, and the circumference of the front end of the supporting deflector 451 is evenly distributed with flow holes 4511, and the outer circumference of the supporting deflector 451 can be provided with adjustment dial 453; and

The equalizing disc 452 is installed on the base pipe 41 corresponding to the supporting deflector 451 and can rotate relative to the supporting deflecting disc 451. The equalizing disc 452 is provided with There are a plurality of flow guide holes 4512, and the balance disc 452 is rotated to adjust the alignment number between the flow guide holes 4512 and the flow passage holes 4511 to adjust the inflow of the oil well liquid and realize self-adaptive flow regulation. Wherein, an adjusting disc 453 may be provided on the outer circumference of the supporting deflector plate 451 and/or the equalizing disc 452 . The rotatable equalizing disc 452 is arranged at the front end of the annular space 43 between the base pipe 41 and the outer sheath 42, and the radial circumference of the rotatable equalizing disc 452 is evenly distributed with diversion holes 4512, and the formation fluid enters the outer sheath through the diversion holes 4512 42 and the annular space 43 of the base pipe 41.

During installation, the water control and flow limiting device 4 is set on the sand control and water control screen 2, and installed in the downhole pipe string, as shown in Figure 1, there are packers 3 for isolation between the formations, so as to realize staged mining. According to the characteristics of the formation reservoir, different numbers of water control and flow limiting devices 4 are installed on the sand control and water control screen 2. Warm production. The pipe string with the water control and flow limiting device 4 is lowered into the horizontal well section, and the formation fluid passes through the flow controller 45 after being filtered by the screen for sand control. The number of inflow holes aligned on the flow plate 451 controls the flow inflow into the annulus of the base pipe 41 and the outer sheath 42 in a balanced manner, so that the wells with high flow rate have more inflow holes, and the wells with low flow rate have fewer inflow holes, so that the formation with high production Fluid flows as much as possible into the production string to equalize formation pressure and prevent bottom water coning. The fluid that has been balanced and limited enters the annular space 43 between the outer sheath 42 of the water control and flow limiting device 4 and the base pipe 41, flows to the medium selector 441 of the automatic adaptive regulator 44, and the water passes through easily. The medium selector 441 continues to flow along the annular space, and after passing through the spring 4421 and the baffle plate 4422 of the spring 4421, it flows to the swirl plate. Due to the blocking effect of the swirl plate, the flow speed slows down, and finally the water on the base pipe 41 flows slowly into the hole Flow into the column of the base pipe 41. However, due to the high viscosity of the oil, most of the oil cannot pass through the medium selector 441. The oil pressure squeezes and pushes the medium selector 441, and the medium selector 441 moves backward and squeezes the spring 4421, so that the oil inflow hole on the base pipe 41 is exposed. The oil flows into the base pipe 41 through the oil inflow hole, so as to realize the self-adaptive flow-limiting and water-controlling effect.

In this embodiment, the outer wall of the outer sheath 42 is stamped into a groove-shaped bridge or an arched bridge. There are sand filter grooves in the gaps on both sides of the grooved bridge or the arched bridge, and the inner wall of the outer sheath 42 is equipped with a sand control The filter screen forms another sand control filtering channel; the front end and the rear end of the base pipe 41 are respectively provided with an oil inlet and a water inlet; a flow controller 45 is installed in the annulus at the middle and lower end between the outer sheath 42 and the base pipe 41 . The formation mixed liquid enters the sand control filter screen of the inner layer of the outer sheath 42 after being filtered through the outer sand filtering groove of the outer sheath 42, and flows into the gap between the outer sheath 42 and the central base pipe 41 after being filtered again. The annular space 43 between them, after the liquid passes through the medium selector 441, most of the oil cannot pass through the medium selector 441, and flows into the pipe string of the base pipe 41 through the hole at the front end of the base pipe 41, and the water passes through the medium selector 441 and continues to flow in the annular space. The flow in the space 43 slowly flows into the column of the base pipe 41 through the small hole on the base pipe 41 after being blocked and restricted by layers of the tail flow controller 45 .

The present invention adopts a double-layer outer sheath 42 with sand control and sand filter functions, which not only protects the device from erosion, but also enhances the sand control and sand filter functions of the device; the flow controller 45 can reduce the flow rate of water and delay the flow of water. Time to flow into the production string, enhancing oil flow. With the function of flow control, while ensuring the high production of high-yield wells, the oil and water can be effectively divided and restricted intelligently, so that more oil can flow into the central production string, and water can flow into the central string slowly and in small amounts, thereby realizing the suppression of water flow , to increase the effect of oil flow, so that wells with high water content can obtain higher oil production. Specifically, it has the following advantages:

A. The flow controller 45 is set at the inflow end of the self-adaptive composite water control and flow limiting device 4, and the number of inflow holes can be adjusted according to the production of the oil well, thereby performing self-adaptive oil stabilization and water control production according to the production of the oil well;

B. After steady flow control, the mixed fluid enters the automatic self-adaptive regulator 44, and the automatic self-adaptive regulator 44 automatically adjusts the number of oil inflow holes according to the size of the fluid flow, so as to realize the automatic control system with more inflow holes in high-yield wells and less inflow holes in low-yield wells. Adaptive regulation, balance formation pressure, and restrain bottom water coning;

C, self-adaptive composite water control and flow limiting device 4, while opening small and few water inflow holes on the base pipe 41, add a swirl plate to delay the flow rate of water;

D. Set the self-adaptive composite water control and current limiting device 4 on the sand control screen, first sand control, and then water control, to achieve the double function of sand control and water control. For oil wells in the middle and later stages of production, the sand control and water control screen 2 can be highly efficient Suppresses water production and increases oil production.

Certainly, the present invention also can have other multiple embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding Changes and deformations should belong to the scope of protection of the appended claims of the present invention.

Claims (8)

1. A water control and current limiting device installed on a sand control water control screen, characterized in that it comprises: The base pipe has an oil flow groove and a water flow hole respectively arranged on the pipe wall, the oil flow groove is close to the inlet end of the base pipe, and the water flow hole is close to the outlet end of the base pipe; The outer sheath is sleeved outside the base pipe, the outer sheath is arranged coaxially with the base pipe, there is an annular space between the outer sheath and the base pipe, and the front end of the outer sheath is arranged There are double-layer sand filter grooves and sand control filter screens; The adaptive controller is arranged in the annular space corresponding to the oil flow groove and the water flow hole, and has an oil flow channel and a water flow channel corresponding to the oil flow groove and the water flow hole respectively. The oil and water are divided and regulated, and the self-adaptive regulator has an initial position and a working position respectively relative to the oil flow tank; and A flow controller, corresponding to the self-adaptive regulator, is installed at the inlet end of the base pipe and connected with the outer sheath, and is used to adjust the inflow of the oil well fluid according to the production of the oil well, so as to realize self-adaptive flow regulation. 2. The water control and flow limiting device according to claim 1, wherein the adaptive regulator comprises: A medium selector, set between the base pipe and the outer sheath, is arranged corresponding to the oil passage groove and has an initial position and a working position respectively relative to the oil passage groove, and the medium selector a device divides the oil flow passage and the water flow passage in the annular space; an elastic reset member, installed on the base pipe and against the medium selector, for the reset of the medium selector from the working position to the initial position; and A water flow decelerator is installed on the base pipe corresponding to the water flow hole, and is used for restricting and decelerating the water flow passing through the medium selector. 3. The water control and flow limiting device according to claim 2, wherein the elastic return member includes a spring and a spring baffle, and the spring and the spring baffle are respectively sleeved on the base pipe, and the spring The two ends of each are against the spring baffle and the medium selector respectively. 4. The water control and current limiting device according to claim 2 or 3, wherein the water flow reducer is a plurality of staggered swirl plates or swirl columns, and the swirl plates or swirl columns are respectively installed alternately on the outer peripheral surface of the base pipe and the inner wall of the outer sheath. 5. The water control and flow limiting device according to claim 2 or 3, wherein the flow controller comprises: The decompression deceleration disc is a disc with an annular groove structure, the annular groove of the decompression deceleration disc is provided with flow holes, and the decompression deceleration disc is arranged at the front end of the base pipe; a support deflector, which is installed on the base pipe corresponding to a viscosity control valve and connected to the outer sheath, and a plurality of flow holes are arranged on the surface of the support deflector; and An equalizing plate is installed on the base pipe corresponding to the supporting baffle and can rotate relative to the supporting baffle, and a plurality of baffles are arranged on the equalizing plate corresponding to the flow holes, Rotating the balance plate adjusts the alignment between the diversion hole and the flow hole to adjust the inflow of the oil well fluid, thereby realizing adaptive flow regulation. 6. The water control and flow limiting device according to claim 4, wherein the flow controller comprises: The decompression deceleration disc is a disc with an annular groove structure, the annular groove of the decompression deceleration disc is provided with flow holes, and the decompression deceleration disc is arranged at the front end of the base pipe; a support deflector, which is installed on the base pipe corresponding to a viscosity control valve and connected to the outer sheath, and a plurality of flow holes are arranged on the surface of the support deflector; and An equalizing plate is installed on the base pipe corresponding to the supporting baffle and can rotate relative to the supporting baffle, and a plurality of baffles are arranged on the equalizing plate corresponding to the flow holes, Rotating the balance plate adjusts the alignment between the diversion hole and the flow hole to adjust the inflow of the oil well fluid, thereby realizing adaptive flow regulation. 7. The water control and flow limiting device according to claim 5, characterized in that, an adjusting disc is arranged on the supporting deflector plate and/or the equalizing plate. 8 . The water control and flow limiting device according to claim 6 , wherein an adjusting plate is arranged on the supporting deflector plate and/or the equalizing plate. 9 .