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Water block removing agent and preparation method thereof

A technology for releasing water lock agent and water agent, which can be used in chemical instruments and methods, drilling compositions, etc., and can solve problems such as difficulty in damage

Active Publication Date: 2017-02-01
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the filtrate enters the reservoir with the increase of time and the increase of the liquid column pressure (for example, to prevent collapse) and the strong capillary force of the reservoir itself, its immersion depth is also increasing, so the damage it produces is particularly serious and difficult to overcome.

Method used

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  • Water block removing agent and preparation method thereof
  • Water block removing agent and preparation method thereof
  • Water block removing agent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] This embodiment provides a dehydrating and locking agent, which is composed of the following substances in weight percentage: 10-12% of weak hydrophilic agent, 8-10% of acid-soluble oxidizing agent, 0.5-1.5% of corrosion inhibitor, and the balance is water.

[0027] The preparation method comprises the following steps:

[0028] Step 1) Weigh the weak hydrophilic agent, acid-soluble oxidant, corrosion inhibitor of formula quantity, or prepare the weak hydrophilic agent, acid-soluble oxidant of formula quantity, and fill the weak hydrophilic agent and acid-soluble oxidant respectively into cans ;

[0029] Step 2) During on-site construction, add the formulated amount of water into the preparation tank, add the prepared weak hydrophilic agent and acid-soluble oxidant into the water at room temperature while stirring, and finally add the corrosion inhibitor and stir evenly to obtain the water-blocking agent.

[0030] Principle of the present invention:

[0031] The weak h...

Embodiment 2

[0033] On the basis of Example 1, the present embodiment has prepared corrosion inhibitors (0.5-1.5%) of different weight percentages, and the consumption of corrosion inhibitors is optimized, wherein, weak hydrophilic agent 11%, by the following weight percentages Material composition, ethylene glycol methyl ether 1.0%, fluoroalkyl quaternary ammonium salt surfactant 0.05%, volume fraction is 95% ethanol 78%, the balance is water; Acid-soluble oxidizing agent 9%, consists of the following substances in weight percentage It consists of 16% sodium nitrate, 14% potassium fluoride, 40.0% HCL with a mass concentration of 37%, and the balance being water.

[0034] Fluoroalkyl quaternary ammonium salt surfactants are extremely difficult to dissolve in water. Ethylene glycol methyl ether must be added to dissolve the surfactant. At the same time, ethanol can increase the gas permeability, and fluoroalkyl quaternary ammonium salt surfactants can Surface tension, the function of releas...

Embodiment 3

[0041] This embodiment provides a dehydrating and locking agent, which is composed of the following substances in weight percentage: 11% of weakly hydrophilic agent, 9% of acid-soluble oxidant, 1.5% of corrosion inhibitor, and the balance is water. Among them, the corrosion inhibitor is 1.0% nitrogen-containing imidazoline + 0.5% HJF-94 corrosion inhibitor.

[0042] Wherein, the weak hydrophilic agent is composed of the following substances by weight percentage, 1.0% of ethylene glycol methyl ether, 0.05% of fluoroalkyl quaternary ammonium salt surfactant, 78% of ethanol with a volume fraction of 95%, and the balance is water; The soluble oxidizing agent is composed of the following substances in weight percentage, 16% of sodium nitrate, 14% of potassium fluoride, 40.0% of HCL with a mass concentration of 37%, and the balance is water.

[0043] In this example, different weight percentages of fluoroalkyl quaternary ammonium salt surfactants (0.02-0.16%) were prepared to optimize...

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Abstract

The invention provides a water block removing agent and a preparation method thereof. The water block removing agent comprises the following substances by weight: 10 to 12% of a weak hydrophilizing agent, 8 to 10% of an acid-soluble oxidizing agent and 0.5 to 1.5% of a corrosion inhibitor, with the balance being water. The water block removing agent is applicable to Changqing ancient low-permeability sandstone gas-bearing formations, enables strong hydrophilicity of low-permeability sandstone gas reservoirs to be changed into weak hydrophilicity, eliminates capillary force in reservoir strata, enters a part of solid-phase particles and cellulose via acid dissolution, decomposes macro-molecular polymers via oxidation, removes blocking and improves gas flooding efficiency in water removal; thus, the restoration ratio of rock core permeability is obviously improved.

Description

technical field [0001] The invention belongs to the technical field of oil and gas reservoir development, and in particular relates to a water-locking agent and a preparation method thereof, which are used in ancient low-permeability sandstone gas layers in Changqing to release water-locking damage caused by drilling fluid. Background technique [0002] Paleo-low permeability gas reservoirs in Changqing generally have the characteristics of high muddy cement content, high water saturation, high capillary pressure, strong water sensitivity, small pore throat, poor permeability, complex structure, and serious heterogeneity. During the process, the drilling fluid filtrate is prone to water-phase capillary self-absorption, causing a large amount of drilling fluid filtrate to enter the reservoir, and the low permeability reservoir has poor permeability, making it difficult or even impossible to flow back the drilling fluid filtrate immersed in the reservoir, forming Severe water ...

Claims

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Application Information

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IPC IPC(8): C09K8/584C09K8/86C09K8/035
Inventor 董宏伟杨斌贾俊陈龙赵建震马祥林王勇强付微风
Owner BC P INC CHINA NAT PETROLEUM CORP
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