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Inter-crack space synchronous water injection-oil extraction method of multistage fracturing horizontal well

A horizontal well and fracturing technology, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of inability to quantitatively evaluate the total oil production, many production processes, and low production efficiency. To achieve the effect of convenient operation, increase production and reduce cost

Active Publication Date: 2016-08-03
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technical solution is relatively complicated. In a horizontal well, only three fractures can be injected with water and oil produced at a time. After the three fractures have completed water injection and oil production, the other three adjacent fractures can be injected with water and produced oil. It can be seen that there are many production processes. The production efficiency is low. In addition, this technical solution cannot quantitatively evaluate the total oil production and the oil production of each fracture.

Method used

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  • Inter-crack space synchronous water injection-oil extraction method of multistage fracturing horizontal well
  • Inter-crack space synchronous water injection-oil extraction method of multistage fracturing horizontal well
  • Inter-crack space synchronous water injection-oil extraction method of multistage fracturing horizontal well

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Embodiment 1

[0035] According to an embodiment of the multi-stage fracturing horizontal well fracture interval simultaneous water injection and oil production method of the present invention, it comprises the following steps in sequence:

[0036] Step 1: Fracturing the wellbore of the horizontal well in stages to form multiple fracturing fractures perpendicular to the wellbore of the horizontal well;

[0037] Step 2: In the early stage of production, use natural energy to mine for a period of time until the bottom hole pressure drops to the bubble point pressure;

[0038] Step 3: Take out the oil pipe, and then install the injection-production separation device at the position of each odd-numbered fracture, and install the dispensing valve at the position of each even-numbered fracture;

[0039] Step 4: On the removed tubing, perforate the positions corresponding to the odd-numbered fractures, and then put the tubing back to the position before taking it out;

[0040] Step 5: Close the we...

Embodiment 2

[0050] According to another embodiment of the multi-stage fracturing horizontal well fracture interval simultaneous water injection and oil recovery method of the present invention, it comprises the following steps in sequence:

[0051] Step 1: Fracturing the wellbore of the horizontal well in stages to form multiple fracturing fractures perpendicular to the wellbore of the horizontal well;

[0052] Step 2: install injection-production separation devices at the positions of each odd-numbered fracture, install dispensing valves at each even-numbered fracture, and open perforations on the tubing corresponding to odd-numbered fractures;

[0053] Step 3: In the early stage of production, use natural energy to mine for a period of time until the bottom hole pressure drops to the bubble point pressure;

[0054] Step 4: Close the wellhead production valve, open the distribution valve, and inject water into the annular space of the oil casing formed by the tubing and casing at the sam...

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Abstract

The invention relates to an inter-crack space synchronous water injection-oil extraction method of a multistage fracturing horizontal well. The method comprises the following steps: forming multiple cracks of the staged fracturing horizontal well; extracting with natural energy in the initial production stage until bottom hole pressure is reduced to bubble point pressure; taking out an oil pipe; mounting an injection-extraction separation device on each odd-level crack, mounting an injection allocation valve on each even-level crack, forming jet holes, corresponding to the odd-level cracks, in the oil pipe, and putting the oil pipe to the home position; closing a well mouth oil extraction valve, starting the injection allocation valves, and injecting water into the annular space of an oil jacket, wherein the injected water flows through a guide pipe and enters the even-level cracks; and opening the well mouth oil extraction valve, wherein crude oil is produced from the odd-level cracks and enters an annular space formed by the guide pipe and a sleeve and the oil pipe and then is extracted through the oil pipe while water injection into the even-level cracks is continuously kept. Each injection-extraction separation device comprises a guide pipe and a packer. The method is simple in technology, can realize uniform displacement and has relatively high practical application value.

Description

technical field [0001] The invention belongs to the technical field of oil and gas reservoir development, and in particular relates to a method for simultaneous water injection and oil production at intervals between multistage fracturing horizontal wells and fractures. Background technique [0002] Multi-stage fracturing of horizontal wells is an effective technology to improve the production of low-permeability and tight oil reservoirs. Since the formation pressure of low-permeability and ultra-low-permeability reservoirs generally drops rapidly after being exploited with natural energy for a period of time, energy needs to be supplemented to improve the development effect of such reservoirs. The conventional well pattern for supplementing energy is vertical well water injection and multi-stage fracturing horizontal well production. This method requires vertical wells to be arranged around the horizontal wells, and factors such as the length of the horizontal section, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B43/20
CPCE21B43/20E21B43/26
Inventor 程时清朱常玉于海洋方冉赵真真孙忠国
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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