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Method for improving performance of fracturing fluid

A fracturing fluid and performance technology, applied in the field of hydraulic fracturing of oil layers, can solve the problems of unsatisfactory flowback rate, large formation damage, large amount of guar gum, etc. amount of effect

Active Publication Date: 2014-12-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, the existing technology has problems such as large amount of guar gum used in fracturing fluid, high residue content, high frictional resistance, unsatisfactory flowback rate and large formation damage.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] When the fracturing fluid prepared by the compound organic base of the present invention is used for construction, the fracturing reservoir depth of the FSX1 well is 3557.5-3574.4m, and the reservoir temperature is 125°C. The composition of the fracturing fluid is 0.35% carboxymethyl hydroxypropyl guar gum, 0.3% drainage aid, 1.0% clay inhibitor, -0.2% organic zirconium crosslinking agent, 0.01% gel breaker, and the balance is water.

[0012] The organic alkali fracturing fluid is obtained according to the following steps:

[0013] The first step: weighing, according to the total amount of liquid preparation, weigh each component material according to the above mass ratio.

[0014] The second step: prepare the base liquid, add the water weighed in the first step into the liquid mixing tank, and then put the weighed carboxymethyl hydroxypropyl guanidine gum, drainage aid, and clay inhibitor into the liquid mixing tank for mixing Uniform, forming a base liquid, the visco...

Embodiment 2

[0019] The difference from Example 1 is that the depth of the fracturing reservoir in Well F4-12 is 2128.0-2141.4m, and the reservoir temperature is 90°C; the mass component of the fracturing fluid is 0.25% carboxymethyl hydroxypropyl guar gum, 0.25% drainage aid, 0.3% clay inhibitor, 0.1% organic zirconium crosslinking agent, 0.008% gel breaker, and the balance is water. When adjusting the pH value, the mass components of the composite organic base are 8% sodium hydroxide, 0.4% triethanolamine, 0.1% tetramethylammonium hydroxide, and the balance is water.

[0020] During construction, use 3.5~4.0m 3 / min displacement construction, the total fracturing fluid volume is 130m 3 , wherein, the amount of sand in the proppant is 16m 3 , the sand ratio is 30%, the construction is smooth, the flowback rate after pressing reaches 100%, the residue content after gel breaking is 70mg / L, the matrix damage to the base core is less than 10%, and the resistance reduction rate is 73%.

Embodiment 3

[0022] The difference from Example 1 is that the depth of the fractured reservoir in Well XWX3 is 4982.8-5064.8m, and the reservoir temperature is 166°C; the mass components of the fracturing fluid are 0.6% carboxymethyl hydroxypropyl guar gum, 0.25% Drainage aid, 0.3% clay inhibitor, 0.1% organic zirconium crosslinking agent, 0.008% gel breaker, and the balance is water. When adjusting the pH value, the mass components of the composite organic base are 12% sodium hydroxide, 0.6% triethanolamine, 0.25% tetramethylammonium hydroxide, and the balance is water.

[0023] During construction, use 4.5~5.0m 3 / min displacement construction, the total fracturing fluid volume is 717.44m 3 , in which, the amount of sand added in the proppant is 53m 3 , the sand ratio is 14%, the construction is smooth, the flowback rate after pressing reaches 100%, the residue content after gel breaking is 270mg / L, the matrix damage to the base core is less than 10%, and the resistance reduction rate ...

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Abstract

The invention relates to the technical field of oil formation hydraulic fracturing and in particular relates to a method for improving performance of a fracturing fluid. The method provided by the invention comprises the steps of adding a compound organic base into a base solution of the fracturing fluid and mixing to be uniform until pH value of the mixed liquor to be 10-12, wherein the compound organic base comprises the following components in percentage by weight: 8-12% of sodium hydroxide, 0.4-0.6% of triethanolamine, 0.15-0.25% of tetramethylammonium hydroxide and the balance of water. By adopting the method provided by the invention, after the compound organic base is added, usage amount of guanidine gum during preparation of the cracking fluid can be reduced, and residue content is low, a friction coefficient is low and flowback rate is high, so that comprehensive performance of the cracking fluid is obviously improved.

Description

technical field [0001] The invention relates to the technical field of oil layer hydraulic fracturing, in particular to a method for improving the performance of fracturing fluid. Background technique [0002] Reservoir hydraulic fracturing, referred to as reservoir fracturing or fracturing, is a technology developed in the 1940s to improve the seepage characteristics of oil reservoirs, and is an important technological measure for increasing production of oil and gas wells and increasing injection of water injection wells. It uses surface high-pressure pumps to inject high-viscosity liquid into the well at a displacement that greatly exceeds the absorption capacity of the formation, and then forms high pressure near the bottom of the well. After the pressure exceeds the formation stress near the bottom of the well and the tensile strength of the rock, fractures are formed in the formation. Continue to inject the fluid with proppant into the fracture, so that the fr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68
Inventor 张华丽周继东包敏新李升芳王进涛金智荣
Owner CHINA PETROLEUM & CHEM CORP
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