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Fracturing process for enhancing low permeability reservoir deliverability

A high-energy gas fracturing and reservoir technology, which is applied in earth-moving drilling, wellbore/well components, and production fluids, etc., can solve problems such as affecting post-fracture productivity, reducing permeability of low-permeability reservoirs, and blocking pore space, etc. To achieve the effect of reducing damage, increasing oil drainage area, and increasing post-pressing production capacity

Active Publication Date: 2008-01-30
BC P INC CHINA NAT PETROLEUM CORP +1
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AI Technical Summary

Problems solved by technology

[0005] According to the classic fracturing theory, the composition of clay minerals in low-permeability reservoirs also has a significant impact on post-fracture productivity. The increase makes it block the pore space in the formation, thereby reducing the permeability of the low-permeability reservoir and affecting the productivity after fracturing

Method used

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  • Fracturing process for enhancing low permeability reservoir deliverability
  • Fracturing process for enhancing low permeability reservoir deliverability
  • Fracturing process for enhancing low permeability reservoir deliverability

Examples

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example 1

[0038] Example 1: Well Zhuang 71-28

[0039] The reservoir depth of this well is 2156m, and the reservoir permeability is 0.95×10 -3 μm 2 , porosity 11.37%, typical low-pressure tight oil reservoir, no fracturing and no industrial oil flow. In order to achieve the combination of fracturing primary fractures and secondary fractures, increase the drainage area of ​​artificial fractures, and increase the productivity of oil wells as much as possible, the reservoir stimulation adopts pre-acid fracturing + intra-fracture steering fracturing technology.

[0040] I. The specific method is:

[0041] 1. The fracture pressure of this well is predicted to be 42MPa through formula calculation, and the statistical data in this area show that the normal average fracture pressure is 43MPa, so this well does not need high-energy gas fracturing.

[0042] 2. Single top seal fracturing string is used in hydraulic fracturing construction; Y344 type packer is used.

[0043] 3. Through the anal...

example 2

[0064] Example 2: Well 67-56

[0065] The buried depth of the oil layer in this well is 1975m, and the electrical permeability of the reservoir is 2.2×10 -3 μm 2 , with a porosity of 10.85%, located at the edge of the block. Compared with the reservoirs in the same block, the reservoir conditions are poorer, the lithology is tighter, and the physical properties are poor. It is predicted that the daily oil production of this well is only 15m3 under conventional fracturing 3 , in order to increase the production capacity after pressing, this process is implemented.

[0066] The specific method is:

[0067] 1. The fracture pressure of the well is determined to be 45MPa through prediction, and the statistical fracture pressure in this area is 38MPa, so the well is firstly subjected to high-energy gas fracturing.

[0068] 2. Considering that the perforation section of the well is 3m, the amount of high-energy gas ammunition in the well is determined to be 50kg.

[0069] 3. Hydr...

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Abstract

The invention relates to an oil field production technique, in particular to a fracturing method applied under the oil well to improve new well production capacity of low permeability reservoir before being brought into production. The fracturing reformation course at least comprises common fracturing technique and is characterized in that the method uses a compound application of more than two techniques of the use of acid fracturing liquid, or diversion agent or acid liquid and diversion agent by adopting high-energy gas fracturing technique; the upper sealed fracturing pipe is adopted during the working of hydraulic fracturing; the acid liquid is adopted during a pad fluid stage as the working liquid; the diversion agent is added for one or more times to seal fractured cracks; an increasing working flow rate is adopted before and after the adding of the diversion agent. The method of the invention can increase oil discharging area after fracturing, reduce expansion rate of clay minerals in fractured reservoir and improve completion of oil well reformation, fracturing effect and production capacity of low permeability reservoir after fracturing.

Description

technical field [0001] The invention relates to an oil recovery technology in an oil field, in particular to a fracturing method used for downhole measures to improve the productivity of a new well before putting into production in a low permeability reservoir. technical background [0002] Before the present invention, conventional hydraulic fracturing methods were commonly used in various oilfields to improve the productivity of new wells, and a support fracture was formed for the fracturing of new wells; Within a certain range, there is a maximum value for the drainage area of ​​fracturing fractures; for stimulation of low-permeability oil wells, the increase of drainage area has a direct impact on improving post-fracture productivity, and the main defect of this method is Productivity is limited by the fracture length, and water-based fracturing fluid can easily cause partial expansion of clay minerals in the reservoir, which reduces the productivity of oil wells and aff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/27
Inventor 赵勇苗晋伟王小文李养池王玲付成举
Owner BC P INC CHINA NAT PETROLEUM CORP
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