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Horizontal well staged fracturing oil production method through injection and production in same well

A technology of staged fracturing and injection and production in the same well, which is applied to wellbore/well components, production fluid, earthwork drilling and production, etc. It can solve the problems of difficult gas injection and high gas injection pressure, and achieve the reduction of development cost and over-flow Effect of area increase and enhanced oil recovery

Active Publication Date: 2015-12-02
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For tight oil reservoirs, there is also the problem of high gas injection pressure and difficult gas injection

Method used

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  • Horizontal well staged fracturing oil production method through injection and production in same well
  • Horizontal well staged fracturing oil production method through injection and production in same well
  • Horizontal well staged fracturing oil production method through injection and production in same well

Examples

Experimental program
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Effect test

Embodiment 1

[0039]A horizontal well staged fracturing method for injection and production in the same well, comprising:

[0040] 1) Staged fracturing of the wellbore of the horizontal well: multiple radial fracturing fractures perpendicular to the wellbore of the horizontal well are formed;

[0041] 2) Three adjacent fractures are selected in the fractures: the one located in the middle is the target injection fracture; the fractures located on both sides of the target injection fracture, and along the injection fluid injection direction are the production fracture I and the production fracture respectively. II; if figure 1 As shown, the fracturing fracture a9 is selected as the production fracture II, the fracturing fracture b10 is selected as the target injection fracture, and the fracturing fracture c11 is selected as the production fracture I;

[0042] 3) Install double-layer concentric oil pipes or parallel double oil pipes in the casing in the wellbore of the horizontal well: divid...

Embodiment 2

[0047] As described in Example 1, a horizontal well staged fracturing method for injecting and producing oil in the same well, the difference is that in the step 5), the fluid is continuously injected, and when the crude oil production drops below the economic production, the phase is reselected. Three adjacent fractures are used as a group of new injection-production fractures, that is, repeat steps 2)-step 5), until the crude oil controlled by all the fractures in the wellbore of the horizontal well is exploited. Such as figure 2 As shown, fracturing fracture d12 is selected as production fracture II, fracturing fracture e13 is selected as target injection fracture, and fracturing fracture f14 is selected as production fracture I.

Embodiment 3

[0049] As described in Example 1-2, a horizontal well staged fracturing method for injection and production in the same well, before the step 1), a low-permeability or tight oil reservoir suitable for horizontal wellbore staged fracturing is selected. Low-permeability reservoirs are preferred, the permeability is 15 mD, the oil layer thickness is 20 meters, and the oil layer does not contain edge and bottom water.

[0050] In the step 1), the horizontal well shaft is drilled along the minimum horizontal principal stress direction of the formation, and the horizontal well shaft is located in the middle and lower part of the oil layer. Here, the preferred horizontal well shaft length is 600 meters, and it is required that the part of the oil layer to be exploited does not contain edge and bottom water. Since edge and bottom water are likely to form water cones locally in the wellbore of horizontal wells or cause rapid water flooding, resulting in a large amount of water producti...

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Abstract

The invention discloses a horizontal well staged fracturing oil production method through injection and production in the same well. Multiple fracturing cracks perpendicular to a horizontal well shaft are generated at different parts of an oil layer through the horizontal well staged fracturing; one of the cracks is selected as a fluid injecting channel, and the adjacent cracks at two sides serve as crude oil production channels; displacement crude oil flows to the cracks at two sides along the crack in the middle; a double-oil-pipe segmented sealing technology is combined to seal the crack and the adjacent two cracks; a fluid is injected in from the middle crack; the displacement crude oil flows to the horizontal well shaft from the adjacent cracks at two sides; and produced liquid flows outside the shaft along another oil pipe channel to form a segmented same-well injection and production system in the same horizontal well.

Description

technical field [0001] The invention relates to a horizontal well staged fracturing method for injection and production in the same well, and belongs to the technical field of oil field development engineering. technical background [0002] With the increasing development of the global economy, the world's demand for oil is growing rapidly. After the large-scale development of conventional oil resources in the last century, the newly-added recoverable reserves of high-quality crude oil are difficult to meet the growing consumption. The situation is particularly prominent in our country. In this context, low-permeability reservoirs and unconventional reservoirs, especially tight reservoirs, are gradually becoming the focus of future oil and gas development in my country. [0003] Low-permeability reservoirs refer to reservoirs with low porosity, small throats, poor permeability (permeability below 50 mD), and low productivity, which usually require reservoir reconstruction t...

Claims

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Application Information

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IPC IPC(8): E21B43/26E21B43/20E21B43/16
CPCE21B43/10E21B43/16E21B43/20E21B43/26
Inventor 李宾飞李兆敏叶金桥李松岩鹿腾
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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