Double-medium layered injection flow control device and control method thereof

A technology for controlling device and injection flow, which is applied in the directions of measurement, production of fluid, and earth-moving drilling, etc. It can solve problems affecting workover efficiency, etc., and achieve the effect of wide application range, high temperature and pressure resistance level, and wide flow range.

Pending Publication Date: 2022-05-10
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the supporting layered water injection tools encountered various problems in the later stage of testing and adjustment, which affected the workover efficiency and could not meet the requirements of cost reduction and efficiency increase in offshore oilfields. , there is an urgent need to develop a dual-media layered injection flow control device suitable for the reservoir characteristics and completion characteristics of offshore oilfield injection wells

Method used

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  • Double-medium layered injection flow control device and control method thereof
  • Double-medium layered injection flow control device and control method thereof
  • Double-medium layered injection flow control device and control method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A control device for double-medium layered injection flow, including an upper layered injection structure, a control device, an adjustable flow assembly and a lower layered injection structure,

[0038] The upper layered injection structure includes an upper outer layer oil pipe 1, an inner layer oil pipe 2 and an upper joint 3, and the inner layer oil pipe 2 is installed in the upper outer layer oil pipe 1, forming a ring between the upper outer layer oil pipe 1 and the inner layer oil pipe 2 In the flow space, the tail end of the inner oil pipe 2 is threadedly connected with the upper joint 3, and the upper joint 3 is respectively provided with a first inner flow passage and a first outer flow passage through the upper joint 3, and the first outer flow passage The channel communicates with the annular flow space, the first inner flow channel communicates with the inner oil pipe 2, the annular flow space and the first outer flow channel form a water injection channel, a...

Embodiment 2

[0043] On the basis of Embodiment 1, a pressure gauge installation assembly is arranged between the tail end of the control unit cabin 6 and the head end of the motor sealing cabin 12, and a polymer injection string pressure gauge 9 is arranged on the pressure gauge installation assembly. Note The poly-column manometer 9 is electrically connected to the control unit 5 .

[0044] The tail end of the inner pipe 7 is provided with a water injection string pressure gauge 13 and a formation pressure monitoring device 14 respectively, and the water injection string pressure gauge 13 and the formation pressure monitoring device 14 are electrically connected to the control unit 5 respectively, and the current oil layer and the lower oil layer Separated by a packer, in order to monitor the front and rear pressures of the adjustable three-way valve 15 in real time and obtain the sealing state of the packer, the polymer injection string pressure gauge 9, the water injection string pressur...

Embodiment 3

[0050] Based on the second embodiment, the upper connector 3 is provided with an upper cable connector 4 for fixing and sealing cables, and the lower connector 17 is provided with a lower cable connector 18 for fixing and sealing cables.

[0051] The minimum outer diameter of the control unit 5 is 95 mm, the equivalent diameters of the first inner overflow channel, the first outer overflow channel, the second inner overflow channel 21 and the second outer overflow channel 22 are at least 32 mm, and the liquid outlet The displacement is 400-550m 3 / d, the pressure difference that the control device for dual-media layered injection flow can withstand is 10-50Mpa, the working temperature of the control device for dual-media layered injection flow is 0-150°C, the control device for dual-media layered injection flow The tensile strength is 40-60t.

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Abstract

The invention provides a double-medium layered injection flow control device and a control method thereof.The lower portion of a connector is in threaded connection with the head end of an outer pipe, a control unit is connected with the tail end of an upper connector, the control unit is electrically connected with an adjustable flow assembly, and a control unit cabin used for protecting the control unit is arranged outside the control unit; an inner pipe is arranged between the control unit cabin and the outer pipe; the control unit is electrically connected with the motor and the speed reducer, the motor and the speed reducer are connected with the head end of the adjusting mechanism, the tail end of the adjusting mechanism is connected with the head end of the adjustable three-way valve, the adjustable three-way valve is arranged in the flow adjusting inner pipe, and the motor, the speed reducer and the adjusting mechanism are both arranged in the motor sealing cabin. The control device does not need to be tripped into an instrument for testing and allocation, is not limited by well deviation, and realizes real-time allocation of the injection rate.

Description

technical field [0001] The invention relates to the technical field of downhole tools for oilfield water flooding and polymer flooding stimulation techniques, and more specifically relates to a dual-medium layered injection flow control device and a control method thereof. Background technique [0002] Since the development of oil companies, there have been many technologies and methods for developing oil wells. Polymer flooding is a technology that can increase the viscosity of the displacement phase, adjust the water absorption profile, increase the swept volume of the displacement phase, and increase the ultimate recovery. Polymer flooding technology is widely used in onshore oilfields, and it is also used in many complex geological oilfields in the Bohai Sea. However, for oil and gas fields with complex geological conditions and serious interlayer permeability imbalance, during the polymer flooding process, if the general polymer injection method is adopted, The polymer ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/14E21B43/20E21B43/12E21B47/06E21B47/07E21B47/00
CPCE21B43/14E21B43/20E21B43/12E21B47/06E21B47/00
Inventor 刘敏牛贵锋杨万有程心平王良杰黄泽超毛庆凯张磊
Owner CHINA NAT OFFSHORE OIL CORP
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