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Production device and method for injection and production in the same well

A technology of injection-production and production methods in the same well, which is applied in the fields of production of fluids, earth-moving drilling and production, wellbore/well components, etc., can solve the problems of injection-production imbalance, production reduction, and impact on the production of adjacent wells, so as to reduce the cost of drilling wells. Quantity, cost savings, increased productivity

Active Publication Date: 2015-09-09
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there are field tests in Liaohe, Shengli, Daqing and other oilfields in China, and the water cut in the tests has decreased to varying degrees. However, if the liquid is not lifted, the production often decreases; but once the liquid is lifted, the injection-production balance will be unbalanced and the production of adjacent wells will be affected. In addition, it is difficult to monitor reinjection parameters, and it is difficult to achieve a balance between injection and production in reality. This is the most important factor that makes it difficult to promote

Method used

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  • Production device and method for injection and production in the same well
  • Production device and method for injection and production in the same well
  • Production device and method for injection and production in the same well

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Experimental program
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Embodiment approach 1

[0034] The embodiment of the present invention proposes a production device for injection and production in the same well, which includes a pipe string and casing 1, the pipe string is sleeved in the casing 1, and the casing 1 is respectively equipped with Corresponding to the oil production port 1a of the oil production section Y and the water injection port 1b corresponding to the water injection section S, an auxiliary pipe 2 is provided at the upper part between the pipe string and the casing 1 . The string includes concentric double pipes 3, a plurality of packers 4 and oil production channels. The upper end of the concentric double pipe 3 is connected to the upper oil pipe 6 through the Y-shaped joint 5, and the lower end of the concentric double pipe 3 is connected to the lower oil pipe 7. The position corresponding to the water injection section S on the concentric double pipe 3 is provided with a dispensing device 8. A plurality of packers 4 are connected between the...

Embodiment approach 2

[0040] figure 1 with figure 2 A schematic diagram showing the first and second embodiments of the present invention, figure 1 The string shown in can be referred to as the top injection type string, figure 2 The string shown in can be referred to as a mid-injection string. Such as figure 1 with figure 2 As shown, the lower end of the inner pipe 3a is connected to the lower oil pipe 7, and the lower end of the annular space between the inner and outer pipes 3a, 3b is closed.

[0041] Further, if figure 1 As shown, the oil production channel includes a through-hole 9 provided on the lower oil pipe 3b. In this embodiment, the oil-water mixture in the oil production section Y enters the lower oil pipe 7 through the oil production port 1 a and the through opening 9 , and then enters the inner pipe 3 a and the upper oil pipe 6 .

[0042] In addition, if figure 2 As shown, when there are many oil production sections Y, for example, when there are two oil production sectio...

Embodiment approach 3

[0048] A mining method for a production device for injection and production in the same well, said mining method comprising the steps of:

[0049] A. Set oil production section Y and water injection section S in the same well.

[0050] B. Water flows down from the secondary pipe 2 and enters the annular space between the inner and outer pipes 3a, 3b of the concentric double pipe 3.

[0051] C. When the water level in the annular space between the inner and outer pipes 3a, 3b reaches the position of the dispenser 8, the water flows out of the outer pipe 3b through the dispenser 8, and passes through the water injection port 1b Enter the water injection section S for water injection.

[0052] D. The oil-water mixture in the oil production section Y enters the inner pipe 3a and the upper oil pipe 6 in the pipe string through the oil production port 1a and the oil production channel, and is pumped out by the oil pump.

[0053] Wherein, when the well is an oil well, the ultra-hig...

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Abstract

The invention discloses a device and a method for exploitation for single-well injection-production. The device for exploitation comprises a pipe string and a casing, wherein the pipe string is sleeved in the casing, an oil extraction hole corresponding to an oil extraction section and a water injection hole corresponding to a water injection section are formed in the casing respectively, and a looped pipeline is arranged between the upper parts of the pipe string and the casing; the pipe string comprises a concentric double pipe, a plurality of packers and an oil extraction passage; the upper end of the concentric double pipe is connected with an upper oil pipe through a Y-shaped joint, the lower end of the concentric double pipe is connected with a lower oil pipe, and an injection allocator is arranged on the concentric double pipe in a position corresponding to the water injection section; the packers are connected between the concentric double pipe and an oil-string casing, and positioned at the upper part of the concentric double pipe and between the oil extraction section and the water injection section; and the oil extraction passage is arranged on the pipe string and corresponds to the position of the oil extraction hole. The number of drilled wells can be reduced during the exploitation, the well drilling cost can be saved, and the reservoir production can be improved.

Description

technical field [0001] The invention relates to the layered production technology in the field of oilfield development, in particular to a production device and method for injection and production in the same well, which are used to rapidly increase the output of mature oilfields. Background technique [0002] Layered production technology includes three types of development technology: layered water injection technology, layered oil recovery and injection-production in the same well. Layered water injection is currently the main technology of layered development. It is difficult to eliminate the interlayer interference caused by bottomhole flow pressure in layered oil production, and it is not tended to be applied in the field. The "same well injection and production" technology includes "downhole oil-water separation and reinjection" (i.e., downhole same well injection and production) and same well pumping and injection. In the oil layer, the same well injection is suita...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/20E21B43/14
Inventor 王高峰马德胜杨长祜胡永乐张善严叶继根
Owner PETROCHINA CO LTD