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Carbonate-based slurry fracturing with solid acid for unconventional reservoir

An unconventional, solid acid technology, applied in the field of hydraulic fracturing fluid, which can solve the problems of high consumption and high cost

Inactive Publication Date: 2016-06-15
SAUDI ARABIAN OIL CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hydraulic fracturing is expensive and consumes large amounts of water, proppant and chemicals

Method used

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  • Carbonate-based slurry fracturing with solid acid for unconventional reservoir
  • Carbonate-based slurry fracturing with solid acid for unconventional reservoir
  • Carbonate-based slurry fracturing with solid acid for unconventional reservoir

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A laboratory simulation was performed using a slurry fracturing fluid according to an embodiment of the present invention. A slurry fracturing fluid was prepared using 30 g of calcium carbonate, 25 g of Portland cement, 20 g of solid acid (carboxylic acid), 15 g of sand, and 10 g of bentonite. Sufficient water is added thereto as slurry water to form a slurry-like fracturing fluid. Slurry fracturing fluid is dropped into plugs and loaded into core flooding rigs. Apply reservoir level pressure. The pressure applied on the sample was 2000 psi, the upstream pressure was 1000 psi and the downstream pressure (back pressure) was 500 psi. The permeability of the plug samples was measured while the temperature was raised from room temperature to reservoir condition 111°C (231°F). Permeability was measured according to the chemical formula shown in Table 1.

[0032] Table 1.

[0033]

[0034] Permeability results in figure 1 shown in . Such as figure 1 As shown, the p...

Embodiment 2

[0040] Same as in Example 1, the laboratory simulation is carried out using slurry fracturing fluid. A second slurry fracturing fluid was prepared using 40 g of calcium carbonate, 25 g of Portland cement, 20 g of solid acid (carboxylic acid), and 15 g of sand. Sufficient water is added to it to create a slurry-like fracturing fluid. Slurry fracturing fluid is dropped into the plug and loaded into the core drive unit. Apply reservoir level pressure. The pressure applied on the sample was 2000 psi, the upstream pressure was 1000 psi and the downstream pressure (back pressure) was 500 psi. The permeability of the plug samples was measured while the temperature was raised from room temperature to reservoir condition 111°C (231°F). Permeability was measured according to the chemical formula shown in Table 2. The results are shown in Table 3.

[0041] table 3

[0042] temperature

[0043] Such as Figure 4 As shown, the permeability increases when the temperature r...

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Abstract

The invention relates to a method for fracturing slurry-shaped fracturing fluid by means of a hydraulic power in an unconventional reservoir. The method comprises the steps of injecting the slurry-shaped fracturing fluid into the unconventional reservoir, wherein the slurry-shaped fracturing fluid comprises a particle part and slurry water, the particle part comprises a solid acid component, injection of the slurry-shaped fracturing fluid can effectively generate a crack network, and the slurry-shaped fracturing fluid can effectively reduce the reservoir temperature from a stationary reservoir temperature to a lower temperature; solidifying the slurry-shaped fracturing fluid to a water-penetrable layer; making the reservoir temperature back to the stationary reservoir temperature for causing hydrolysis of the solid acid; realizing hydrolysis of the solid acid for generating liquid acid; and simulating the crack network by means of the liquid acid for improving penetrability of the water-penetrable layer of the crack network in the unconventional reservoir, wherein penetrability increase can effectively generate sweet points.

Description

technical field [0001] The present invention relates to hydraulic fracturing fluids for unconventional reservoirs. More specifically, the present invention relates to slurry fracturing fluids for use in unconventional reservoir formations. The invention also relates to techniques to facilitate fracturing while drilling. Background technique [0002] The recovery or extraction of unconventional natural gas using techniques other than conventional well methods. Extracting unconventional natural gas is becoming increasingly important as conventional oil reserves become scarcer. [0003] Typically, unconventional natural gas is found in reservoirs that contain natural gas but are very tight. These unconventional reservoirs include reservoirs such as tight sand, shale gas, shale oil, coalbed methane, tight carbonate and gas hydrate reservoirs. Typically, these reservoirs are largely impermeable. Commercial production of natural gas or oil can therefore be extracted from thes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/14C04B28/04
CPCC04B28/04C09K8/14C09K8/46C04B14/06C04B14/104C04B14/28C04B22/0026C04B22/124C04B24/005C04B24/02C04B24/16C04B38/04E21B43/267
Inventor 哈泽姆·候赛因·阿巴斯阿卜杜勒拉曼·阿卜杜勒阿齐兹·阿勒-穆勒哈姆米拉尤丁·R·科哈恩维克托·V·希拉
Owner SAUDI ARABIAN OIL CO
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