Carbonate rock multi-slug injection type fracturing method

A carbonate rock, multi-slug technology, applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc., can solve problems such as difficulty in adding sand

Inactive Publication Date: 2013-08-14
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD CHANGQING DOWNHOLE TECH CO
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a multi-slug injection fracturing method for carbonate rocks. In view of the difficulty in adding sand to carbonate reservoirs, multi-slug injection is used to realize the fracturing construction of carbonate reservoirs.

Method used

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  • Carbonate rock multi-slug injection type fracturing method
  • Carbonate rock multi-slug injection type fracturing method

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Assuming that the wellhead to the perforation section is 3000m long, the fracturing string adopts 2 7 / 8-inch outer thickened tubing with an inner diameter of 62.0mm, the inner volume of the tubing is 9m 3 . The fracturing construction adopts tubing to inject 40 / 70 mesh proppant with apparent density of 1.8, and 30 / 50 mesh proppant with apparent density of 1.65.

[0020] According to a carbonate rock multi-slug injection fracturing method, the well is fracturing, and the specific steps are as follows:

[0021] Step 1. Determine the amount of fracturing fluid and the scale of fracturing. According to the logging and seismic physical data, combined with the relevant data of drilling, completion and adjacent wells, conduct a comparative analysis to determine the direction and development of the reservoir in the direction of fracture extension, and then Determine the amount of fracturing fluid and the scale of fracturing.

[0022] Step 2, determine the addition of proppa...

Embodiment 2

[0034] Taking the construction pumping process of Well 48 in Kruk Oilfield, Uzbekistan as an example, the steps are basically the same as those in Example 1.

[0035] Such as figure 2 As shown, the fracturing operation curve of Well 48 in Crook Oilfield reflects the implementation of this fracturing method in the field. After the injection of the first two proppant slugs in the fracturing stage, the construction pressure increased rapidly, from 26 MPa to 66 MPa within 20 minutes. Obviously fluctuate, and then add proppant continuously by conventional sand adding method. When the proppant concentration is greatly increased, the construction pressure basically remains stable, or even drops slightly.

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Abstract

The invention relates to the technology of oil field fracturing construction, in particular to a carbonate rock multi-slug injection type fracturing method which is characterized by including the following steps: determining fracturing liquid dosage and fracturing scale, determining propping agent slug and adding quantity of isolation liquid, adding small-particle propping agent in the prepad fluid section stage, adding low-density high-strength propping agent in the main fracturing stage, increasing sand ratio and utilizing a wedging mode to add sand. In the carbonate rock multi-slug injection type fracturing method, a multi-slug mode is adopted for injection under the condition that sand adding of a carbonate reservoir is difficult to achieve fracturing construction of the carbonate reservoir.

Description

technical field [0001] The invention relates to an oil field fracturing construction technology, which is a multi-slug injection type fracturing method for carbonate rocks. Background technique [0002] Carbonate reservoirs have high calcite content, well-developed natural fractures, fractures and caves, particularly strong heterogeneity, low matrix permeability and effective porosity. After acidification, it is easy to form uniform etching on the fracture surface, and the flow conductivity after the closure pressure is high and the acid fracturing is limited. [0003] The Young's modulus, tensile strength, and fracture toughness of carbonate rocks are higher than those of sedimentary rocks, resulting in high pressures in the fracture, expansion, and extension of fractured fractures. A complex multi-fracture system is easy to form near the wellbore. The multi-fracture system is competing to extend, which reduces the effective fracture width and makes it difficult to add sa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26
Inventor 池晓明陶长州孙虎张冕袁冬蕊包小红周荣萍刘欢杨燕宋孝丹郭艳萍高红平刘小会尹俊禄
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD CHANGQING DOWNHOLE TECH CO
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