Low-injury clean fracturing fluid of oilfield oil well and application of fracturing fluid

A technology for cleaning fracturing fluid and fracturing fluid, applied in wellbore/well components, production fluid, drilling composition, etc., can solve the problems of incomplete gel breaking residues, block fracture channels, etc., and achieve complete gel breaking , the effect of increasing production, improving production reserves and recovery factor

Inactive Publication Date: 2014-06-25
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the above-mentioned defects in the prior art, the purpose of the present invention is to propose a low-damage clean fracturing fluid for oil wells, which can solve the problems of incomplete gel breaking and residue clogging in the fracturing fluid after the formation is broken in the fracturing process of oil reservoirs The problem of crack holes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] This embodiment provides a low-damage clean fracturing fluid for oilfield oil wells, which consists of the following components in terms of mass percentage: 0.7wt% cetyltrimethylammonium bromide, 0.7wt% sodium salicylate as an auxiliary agent, and the rest The amount is water.

[0020] In this example, Naiman Oilfield, a low-permeability and low-pressure heavy oil reservoir, is taken as the example oilfield. The porosity of this oilfield is 14.6%, and the permeability is 12.2×10 -3 μm 2 , strong water sensitivity, low Young's modulus of reservoir rock (average 11000-16000MPa), prone to proppant embedding, affecting fracture conductivity, low bottom pressure coefficient, high viscosity of crude oil.

[0021] Inject cetyltrimethylammonium bromide and additive sodium salicylate into water, mix well to prepare low-harm clean fracturing fluid, and then mix 200-300 cubic meters of the fracturing fluid at 3.5-4.5 cubic meters / Minute flow rate is injected into the oil well i...

Embodiment 2

[0026] This embodiment provides a low-damage clean fracturing fluid for oilfield oil wells, which consists of the following components in terms of mass percentage: 0.8wt% cetyltrimethylammonium bromide, 0.9wt% sodium salicylate as an auxiliary agent, and the rest The amount is water.

[0027] In this example, Naiman Oilfield, a low-permeability and low-pressure heavy oil reservoir, is taken as the example oilfield. The porosity of this oilfield is 14.6%, and the permeability is 12.2×10 -3 μm 2 , strong water sensitivity, low Young's modulus of reservoir rock (average 11000-16000MPa), prone to proppant embedding, affecting fracture conductivity, low bottom pressure coefficient, high viscosity of crude oil.

[0028] Inject cetyltrimethylammonium bromide and additive sodium salicylate into water, mix well to prepare low-harm clean fracturing fluid, and then mix 200-300 cubic meters of the fracturing fluid at 3.5-4.5 cubic meters / The flow rate of 10 minutes is injected into the...

Embodiment 3

[0033] This embodiment provides a low-damage clean fracturing fluid for oilfield oil wells, which consists of the following components in terms of mass percentage: 1.2wt% cetyltrimethylammonium bromide, 0.8wt% sodium salicylate as an auxiliary agent, and the rest The amount is water.

[0034] In this example, Naiman Oilfield, a low-permeability and low-pressure heavy oil reservoir, is taken as the example oilfield. The porosity of this oilfield is 14.6%, and the permeability is 12.2×10 -3 μm 2 , strong water sensitivity, low Young's modulus of reservoir rock (average 11000-16000MPa), prone to proppant embedding, affecting fracture conductivity, low bottom pressure coefficient, high viscosity of crude oil.

[0035] Inject cetyltrimethylammonium bromide and additive sodium salicylate into water, mix well to prepare low-harm clean fracturing fluid, and then mix 200-300 cubic meters of the fracturing fluid at 3.5-4.5 cubic meters / The flow rate of 10 minutes is injected into the...

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Abstract

The invention provides low-injury clean fracturing fluid of an oilfield oil well, which comprises the following components in percentage by mass: 0.7-1.8 wt% of hexadecyl trimethyl ammonium bromide, 0.7-0.9 wt% of additive sodium salicylate, and the balance of water. The low-injury clean fracturing fluid of the oilfield oil well has the advantages that the fracturing fluid can thoroughly perform gel breaking, flowback rate is high, the problems that gel breaking is not thorough and crack pore channels are blocked by residues after gel of the fracturing fluid is broken in a stratum in the oil layer fracturing improvement process can be solved, injury of the fracturing fluid to an oil layer is reduced, and the low-permeability reservoir producing reserve, the recovery efficiency and the yield are increased.

Description

technical field [0001] The invention relates to a low-damage clean fracturing fluid for oil wells in oil fields and its application, and belongs to the technical field of fracturing additives for low-permeability oil reservoirs. Background technique [0002] At present, there are mainly two types of fracturing fluids used in major oilfields in China when tuff reservoirs are stimulated, namely, conventional hydroxypropyl guar gum and high-temperature hydroxypropyl guar gum. These two fracturing fluids have problems such as incomplete gel breaking and residue blocking fracture channels after the formation gel is broken. Therefore, in terms of oil reservoir fracturing reconstruction, the key technical problem to be solved is how to reduce the damage of fracturing fluid to oil reservoirs. Contents of the invention [0003] In view of the above-mentioned defects in the prior art, the purpose of the present invention is to propose a low-damage clean fracturing fluid for oil wel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68E21B43/26
CPCC09K8/68E21B43/26
Inventor 李作臣张忠华詹良周长城张剑徐滨李斌郭明刚李明军于超牛志东吴艳芬赵美丽张虎荆琪崔月季双玲鲍晓晗
Owner PETROCHINA CO LTD
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