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Downhole fluid separation self-driving well for same-well multi-layer self-injection and production and production method

A technology of fluid separation and fluid separation system, which is applied in the fields of downhole fluid separation self-driving wells and production, which can solve the problems of low ultimate recovery, many surface equipment, and large floor area, so as to reduce lifting energy consumption and save cost, the effect of reducing the number of drilling wells

Active Publication Date: 2020-11-20
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a self-driving well with self-injection and production of multiple layers in the same well, so as to solve the problems of the prior art with many drilling wells, many ground equipment, large floor area, large energy loss, low single well production, Problems of low ultimate recovery and high production cost

Method used

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  • Downhole fluid separation self-driving well for same-well multi-layer self-injection and production and production method
  • Downhole fluid separation self-driving well for same-well multi-layer self-injection and production and production method
  • Downhole fluid separation self-driving well for same-well multi-layer self-injection and production and production method

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Embodiment approach 1

[0044] Such as Figure 1 to Figure 8 As shown, the present invention provides a self-driving well for downhole fluid separation with multi-layer self-injection and production in the same well, which is used to exploit multiple reservoirs 100, which includes a parent well 1, a branch well group and a downhole fluid separation system 4, the parent well 1. An injection channel 5 and a production channel 6 are not connected to each other; each branch well group includes at least one injection well section 2 and at least one production well section 3, and at least one reservoir 100 is provided with the branch well group , the injection channel 5 of the parent well 1 communicates with multiple reservoirs 100 through the injection well section 2, the production channel 6 of the parent well 1 communicates with multiple reservoirs 100 through the production well section 3, and the injection well section 2 and the injection well section The flow channel 5 is connected to form (constitut...

Embodiment approach 2

[0077] Such as Figure 1 to Figure 8 As shown, the present invention also provides a mining method for self-driving wells with multi-layer self-injection and production of the same well, which is used to exploit multiple reservoirs. The structure, working principle and beneficial effect of separating the self-driving well are the same as those of the first embodiment, and will not be repeated here; the mining method includes the following steps:

[0078] Step a, sidetracking or fracturing at least one injection well section 2 and at least one production well section 3 in at least one reservoir 100 from the parent well 1, the injection well section 2 and the production well section 3 located in the same reservoir 100 are separated set up;

[0079] Step b, injecting the injection fluid into the injection flow channel 5, and injecting the injection fluid into each injection well section 2 through the injection flow channel 5, and then injecting into the reservoir 100;

[0080] ...

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Abstract

The invention provides a downhole fluid separation self-driving well for same-well multi-layer self-injection and production and a production method, and the self-driving well comprises a mother wellwhich is provided with an injection flow channel and a production flow channel which do not communicate with each other; a branch well group which comprises at least one injection well section and atleast one production well section, wherein a branch well group is arranged in at least one reservoir, the injection flow channel communicates with the plurality of reservoirs through the injection well section, the production flow channel communicates with the plurality of reservoirs through the production well section, the injection well section communicates with the injection flow channel to form an injection channel, and the production well section communicates with the production flow channel to form a production channel; and an underground fluid separation system, wherein the inlet of thesystem communicates with the production flow channel, a first outlet communicates with the wellhead, and a second outlet communicates with the injection flow channel. Underground oil-water, oil-gas or gas-water separation can be achieved, self-displacement and energy supplementation are achieved in multiple layers of the same well, lifting energy consumption is reduced, the number of wells to bedrilled and ground separation treatment equipment are reduced, cost is saved, and the single-well yield and the recovery ratio are improved.

Description

technical field [0001] The invention relates to the technical field of exploration and development of oil and gas fields, and refers to a self-driving well adopting a new well-type well pattern, in particular to a downhole fluid-separated self-driving well and a mining method for multi-layer self-injection and production in the same well. Background technique [0002] The most commonly used well pattern in the development of existing oil and gas fields is the injection-production well group composed of injection wells and production wells. The fluid is injected through the injection wells to displace the oil-gas-water mixed fluid in the reservoir to the adjacent production wells and lift the production wells. The oil-gas-water mixed fluid produced on the surface of the wellhead is separated and treated by the surface oil-water treatment equipment. When the injection-production well group is used for the development of oil and gas fields, at least one injection well, one prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/16E21B43/38E21B43/26E21B34/06
CPCE21B43/16E21B43/38E21B43/26E21B34/06Y02E10/10
Inventor 王锦芳王正茂谢雯田昌炳石成方朱怡翔李保柱叶继根高兴军李勇郝银全刘文岭胡水清王玉学马朋善陈欢庆
Owner PETROCHINA CO LTD