Hydraulic oscillation fracturing technology for oil and gas wells

A well hydraulic and process technology, applied in the field of oil and gas well hydraulic oscillating fracturing technology, can solve the problems of slow pressure increase, increase induced stress around fractures, and difficulty in opening natural micro-fractures in reservoirs, and achieve the goal of optimizing fracture shape Effect

Active Publication Date: 2014-07-09
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of fracturing technology has a relatively low pressure increase range and a slow pressure increase speed in fractures, and the following problems exist in the stimulation of some reservoirs:
For reservoirs with well-developed natural micro-fractures, there are two problems in the conventional fracturing process: one is that the pressure in the fractures is low, and it is difficult to realize the opening of natural micro-fractures in the reservoir; Slower, because the fluid loss of the fracturing fluid increases the induced stress around the fracture and increases the opening pressure of the micro-fracture, making it more difficult for the natural micro-fracture to open

Method used

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  • Hydraulic oscillation fracturing technology for oil and gas wells

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Step 1: Perforate the target layer of gas well fracturing stimulation (burial depth 3300m, closure pressure difference between vertical reservoirs is 5MPa);

[0021] Step 2: Select cross-linked liquefied petroleum gas as the fracturing fluid, use Ф88.9mm tubing, and use 4.0m 3 / min displacement for injection;

[0022] Step 3: After the formation ruptures, during the pre-fluid injection process, a total of 10m of fracturing fluid is injected 3 (Note: The amount of front fluid is 100 m 3 ), quickly stop the pump, stop the pump speed (displacement by 4.0m 3 / min to 0) is less than 0.1 seconds;

[0023] Step 4: Wait for 30-60s;

[0024] Step 5: Turn on the pump to 4.0m 3 30m of accumulative fracturing fluid injected per minute 3 , quickly stop the pump, stop the pump speed (displacement by 4.0m 3 / min to 0) is less than 0.1 seconds;

[0025] Step 6: Wait for 30-60s;

[0026] Step 7: Turn on the pump to 4.0m 3 / min displacement accumulatively injected 80m of fractu...

Embodiment 2

[0030] Step 1: Perforate the target layer of gas well fracturing (reservoir temperature is 100°C, buried depth is 3300m, and natural micro-fractures are developed);

[0031] Step 2: Choose carbon dioxide-guar gum foam as the fracturing fluid, use Ф88.9mm tubing, and use 4.0m 3 / min displacement for injection;

[0032] Step 3: After the formation ruptures, during the prefluid injection process, a total of 10m of foam fracturing fluid is injected 3 (pre-fluid volume is 100m 3 ), pump stop, pump stop speed (displacement by 4.0m 3 / min to 0) is less than 0.1 seconds;

[0033] Step 4: Wait for 30-60s;

[0034] Step 5: Turn on the pump to 4.0m 3 20m of foam fracturing fluid is injected accumulatively at the displacement per minute 3 , quickly stop the pump, stop the pump speed (displacement by 4.0m 3 / min to 0) is less than 0.1 seconds;

[0035] Step 6: Wait for 30-60s;

[0036] Step 7: Turn on the pump to 4.0m 3 30m of foam fracturing fluid is injected accumulatively per ...

Embodiment 3

[0045] It is basically the same as in Example 1, except that the gas well is subjected to fracturing reconstruction.

[0046] The comparison between the hydraulic oscillation fracturing process of the present invention and the conventional fracturing process is shown in Table 1 and Table 2, wherein the effects of Embodiment 1 and Embodiment 3 are the same.

[0047] Example 1 Comparison between hydraulic oscillation fracturing technology and conventional fracturing technology (Table 1)

[0048]

[0049] Example 2 Comparison between hydraulic oscillation fracturing technology and conventional fracturing technology (Table 2)

[0050] .

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Abstract

The invention relates to the technical field of fracturing technologies implemented in petroleum extraction, and discloses a hydraulic oscillation fracturing technology for oil and gas wells. The hydraulic oscillation fracturing technology is characterized by at least comprising steps of 1), perforating fracturing modification target strata of the oil wells or the gas wells; 2), selectively utilizing compressible fluid as fracturing fluid and injecting the fracturing fluid in the target strata by the aid of phi88.9mm oil pipes with the displacement higher than 4.0m<3>/min; 3), injecting a certain quantity of fracturing fluid in a front fluid injection procedure after each stratum is fractured, then quickly stopping pumps, waiting for 30-60s after the pumps are stopped, repeatedly quickly stopping the pumps by 3-5 times in an integral front fluid injection stage, and sequentially increasing consumption of the fracturing fluid. The hydraulic oscillation fracturing technology has the advantages that the post-fracturing yields of the reservoir strata can be increased by the aid of the technology, a longitudinal complete penetration effect can be realized in longitudinal strong heterogenous reservoir stratum fracturing operation, and micro-fractures can be greatly opened in the micro-fracture developed reservoir strata.

Description

technical field [0001] The invention relates to a fracturing reconstruction operation used in oil exploitation, in particular to a hydraulic oscillating fracturing process for oil and gas wells. Background technique [0002] With the deepening of exploration and development of low-permeability oilfields, a large number of low-permeability and ultra-low-permeability reservoirs have entered the stage of large-scale development, and fracturing technology has gradually become the main technology for the development of low-permeability oil and gas fields. However, most of the currently used fracturing techniques increase the pressure in the fracture by increasing the injection displacement and increasing the viscosity of the fracturing fluid. This kind of fracturing technology has a relatively low pressure increase range and a slow pressure increase speed in fractures, and the following problems exist in the stimulation of some reservoirs: [0003] (1) For reservoirs with large...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B28/00
Inventor 苏伟东宋振云任雁鹏李勇王忍峰文果黄永章武月荣樊庆缘武龙
Owner BC P INC CHINA NAT PETROLEUM CORP
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