Fracturing method of reservoir

A fracturing and reservoir technology, applied in the field of reservoir fracturing, can solve the problems of less clogged fractures and unreasonable distribution of reservoirs, and achieve the effect of strengthening flowback, improving fracture creation efficiency, and promoting energy supplementation

Inactive Publication Date: 2021-05-18
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

[0008] In view of the problems existing in the prior art, one of the purposes of the present invention is to provide a method for fracturing reservoirs, which solves the problems of less clogged gaps and unreasonable distribution of reservoirs through a coordinated coordination system, and creates complex fractures and fractures. Expand the main fracture, and the injection slug position of liquid carbon dioxide can improve the flowback of the subsequent injected water-based fracturing fluid, effectively improve the conductivity of the reservoir, and achieve the goal of high and stable production of oil and gas wells

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] This embodiment provides a fracturing method for a heavy oil sandstone reservoir, the fracturing method comprising: sequentially adding the first agent, the second agent and the third agent to the formation;

[0046] The first medicament is a viscosity reducer and earth acid; the injection rate of the first medicament is 0.2m 3 / min; the injection volume of the first medicament is 30m 3 , soil acid injection volume is 30m 3 The highest injection pressure of the first agent is the relatively small value of the difference between 80% of the maximum wellhead pressure and the difference between the formation fracture pressure and the hydrostatic column pressure;

[0047] The second medicament is liquid carbon dioxide; the injection rate of the second medicament is 3m 3 / min; the injection rate of the second medicament is 50% of the injection rate of the water-based fracturing fluid; the maximum injection pressure of the second medicament is 80% of the formation fracture p...

Embodiment 2

[0051] This embodiment provides a fracturing method for tight gas reservoirs, the fracturing method comprising: sequentially adding the first agent, the second agent and the third agent to the formation;

[0052] The first medicament is polyhydric acid; the injection rate of the first medicament is 0.5m 3 / min; the injection volume of the first agent is 50m 3 The highest injection pressure of the first agent is the relatively small value of the difference between 80% of the maximum wellhead pressure and the difference between the formation fracture pressure and the hydrostatic column pressure;

[0053] The second medicament is liquid carbon dioxide; the injection rate of the second medicament is 5m 3 / min; the injection rate of the second medicament is 40% of the injection rate of the water-based fracturing fluid; the maximum injection pressure of the second medicament is 80% of the formation fracture pressure-hydrostatic column pressure maximum wellhead pressure ;

[0054]...

Embodiment 3

[0057] This embodiment provides a fracturing method for a tight sandstone heavy oil reservoir, the fracturing method includes: sequentially adding the first agent, the second agent and the third agent to the formation;

[0058] The first medicament is an organic acid; the injection rate of the first medicament is 3m 3 / min; the injection volume of the first agent is 100m 3 The highest injection pressure of the first agent is the relatively small value of the difference between 80% of the maximum wellhead pressure and the difference between the formation fracture pressure and the hydrostatic column pressure;

[0059] The second medicament is liquid carbon dioxide; the injection rate of the second medicament is 6m 3 / min; the injection volume of the second agent is 400m 3 ; The highest injection pressure of the second medicament is 80% of the formation fracture pressure-hydrostatic column pressure maximum wellhead pressure;

[0060] The third agent includes water-based fractu...

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Abstract

The invention relates to a fracturing method of a reservoir. The fracturing method comprises the steps that a first agent, a second agent and a third agent are sequentially added into a stratum; the first agent comprises one or a combination of at least two of mud acid, multi-hydrogen acid and organic acid; the second agent is liquid carbon dioxide; the third agent comprises water-based fracturing fluid and a propping agent; by adopting a specific agent treatment mode, treatment of the total wave and the volume of the reservoir is achieved, a fracture network is constructed in a near-wellbore area, and the minimum main stress of the near-wellbore area is eliminated; the water-based fracturing fluid constructs a main fracture with the high flow conductivity in a far-wellbore area, so that the fracture extends to the deep part of the reservoir, the volume of the fracturing wave is further expanded, and a powerful guarantee is provided for continuous high and stable yield of a subsequent oil and gas well; and the liquid carbon dioxide in the middle section plays a role in promoting flowback and supplementing energy.

Description

technical field [0001] The invention relates to the field of oilfield exploitation, in particular to a reservoir fracturing method. Background technique [0002] At present, with the upgrading of domestic industry, the demand for oil and gas resources, especially natural gas, is further increasing. However, my country's unconventional natural gas resources are mainly tight sandstone gas and shale gas, which are difficult to exploit. Hydraulic fracturing technology is a method that must be adopted after the drilling and completion of natural oil and gas wells. Hydraulic fracturing sand filling is used to create artificial fractures in natural gas reservoirs, and sand filling maintains high conductivity of fractures, so that oil and gas wells can achieve higher productivity. Level. [0003] However, there are technical disadvantages in the application of conventional hydraulic fracturing to natural gas reservoirs. No matter whether the natural gas reservoir is tight sandstone...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B43/267E21B43/22
CPCE21B43/26E21B43/267E21B43/16
Inventor 王涛董家峰韩汉培刘国华曹蕾李壮何璐璐王源
Owner BC P INC CHINA NAT PETROLEUM CORP
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