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A desorbent and its evaluation method

A technology of desorption and active agent, applied in the field of desorption agent and its evaluation, can solve the problems of unsatisfactory flowback effect, insufficient evaluation of adsorption capacity, large amount of addition, etc., achieve scientific and reasonable experimental method, reduce capital investment, change The effect of wettability

Active Publication Date: 2017-01-25
BEIJING DADE GUANGYUAN PETROLEUM TECH SERVICE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the drainage aids used by those skilled in the art only pay attention to their ability to reduce surface tension, and have insufficient evaluation of their ability to remove low-permeability formations to measure liquids, and there are large additions and poor flowback effects in field applications. Ideal Disadvantages

Method used

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  • A desorbent and its evaluation method
  • A desorbent and its evaluation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Polyoxyethylene sorbitan monolaurate 20%, C 12 Fatty alcohol polyoxyethylene (10) ether 20%, alkyl polyglycoside 10%, ethylene glycol butyl ether 10%, isopropanol 5%, distilled water 35% stir at 30 ℃, mix and discharge; The adsorbent is prepared with a desorbent aqueous solution with a content of 0.1%.

[0052] Experimental results:

[0053]The surface tension of above-mentioned 0.1% desorbent aqueous solution is 29.6mN / m,

[0054] Desorption efficiency V 1 was 39.6%,

[0055] Desorption efficiency improvement rate F 1 was 13.8%.

Embodiment 2

[0057] Polyoxyethylene sorbitan monostearate 10%, C 12 Fatty alcohol polyoxyethylene (20) ether 20%, alkyl polyglycoside 10%, ethylene glycol butyl ether 10%, isopropanol 5%, distilled water 45% stir at 30 ℃, mix and discharge; The adsorbent is prepared with a desorbent aqueous solution with a content of 0.1%.

[0058] Experimental results:

[0059] The surface tension of the above-mentioned 0.1% desorbent aqueous solution is 30.3mN / m,

[0060] Desorption efficiency V 2 was 38.4%,

[0061] Desorption efficiency improvement rate F 2 was 12.6%.

Embodiment 3

[0063] Polyoxyethylene sorbitan monostearate 20%, C 12 Fatty alcohol polyoxyethylene (20) ether 15%, alkyl polyglycoside 5%, ethylene glycol butyl ether 10%, isopropanol 5%, non-ionic fluorocarbon surfactant 5%, distilled water 40% at 30°C Stir, mix evenly and discharge; configure a desorbent aqueous solution with a content of 0.1% according to the above desorbent.

[0064] Experimental results:

[0065] The surface tension of the above-mentioned 0.1% desorbent aqueous solution is 27.2mN / m,

[0066] Desorption efficiency V 3 was 40.1%,

[0067] Desorption efficiency improvement rate F 3 was 14.3%.

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Abstract

The invention discloses a desorbent and its evaluation method. The desorbent comprises 10-20wt% of a polyoxyethylene anhydrosorbitol ester nonionic surfactant, 10-20wt% of a fatty alcohol polyoxyethylene ether nonionic surfactant, 5-20wt% of an alkyl polyglycoside surfactant, 5-10wt% of an alcohol ether cosolvent, 5-10wt% of an alcohol solvent, 0-10wt% of a nonionic fluorocarbon surfactant, and the balance distilled water, and is prepared by mixing the above raw materials at 30-50DEG C, and uniformly stirring. The evaluation method comprises a step a, a step b and a step c shown in the specification. The desorbent can be applied to the technical field of oilfield chemicals, can realize a low surface tension, can effectively reduce the resistance of stratum to the adsorption force of a fracturing and acidifying raffinate, and can effectively reduce the capillary adsorption force.

Description

technical field [0001] The invention relates to the technical field of oilfield chemicals, in particular to a desorbent and an evaluation method thereof. Background technique [0002] In the prior art, with the increasing exploitation of low-permeability oil and gas fields, the oil and gas layer protection effects of various stimulation measures applied to oil wells and gas wells have received great research attention. Specifically: when acidizing and fracturing fluids are injected into wells at high speed, a considerable part of the injected fluids seeps into the rock matrix in addition to creating fractures. The residual liquid in the rock matrix and fractures will reduce the flow channel, that is, reduce the relative permeability; thereby affecting the production of subsequent oil and gas wells after resumption of production. The physical property closely related to this phenomenon is capillary force, and this effect is more prominent for low-permeability oil and gas res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/74C09K8/52E21B43/27
CPCC09K8/602C09K8/604E21B43/26
Inventor 王铁林
Owner BEIJING DADE GUANGYUAN PETROLEUM TECH SERVICE
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