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Self-tackifying diverting acid liquor thickening agent as well as preparation method and application thereof

A technology of turning to acid and thickener, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as temperature lower than 120 ℃, limited acid liquid injection and displacement, and temperature resistance defects, etc., to achieve reduction Ground pump pressure, increase the action distance, and improve the effect of acidification

Pending Publication Date: 2022-04-22
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, there are still certain problems in the current self-steering acid liquid system: (1) the concentration of the steering agent is generally around 4%-8% to achieve an effective viscosity-increasing effect; (2) there are certain defects in the temperature resistance, and the general use temperature is lower than 120°C; (3) The frictional resistance of the diverted acid fluid system in the wellbore is relatively large, and the injection displacement of the acid fluid is limited under the condition of pressure limitation

Method used

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  • Self-tackifying diverting acid liquor thickening agent as well as preparation method and application thereof
  • Self-tackifying diverting acid liquor thickening agent as well as preparation method and application thereof

Examples

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Embodiment 1

[0043] The present embodiment provides a kind of preparation method of self-viscosification diverting acid liquid thickener, specifically comprises the following steps:

[0044] 1. Fully mix dimethyldiallylammonium chloride, octadecyldimethylallyl ammonium chloride, acrylamide, and acryloylmorpholine in distilled water at a mass ratio of 7:0.2:2:0.8 , prepared as an intermediate solution with a mass concentration of 30%, adding glacial acetic acid and sodium carbonate as pH regulators until the pH of the intermediate solution reaches 6.3, and placing the intermediate solution in an oil bath for temperature control.

[0045] 2. Adjust the temperature of the oil bath to -3°C, and continuously feed 99.999% high-purity nitrogen into the intermediate solution. After 30 minutes, add ethylenediamine, ammonium persulfate, and hydrogen sulfite with a mass ratio of 5.5:3:1.5 A low-temperature initiation system formed by potassium, then adding potassium formate as a molecular weight regu...

Embodiment 2

[0049] This embodiment provides a kind of preparation method of self-viscosifying and diverting acid liquid thickener, and its difference with embodiment 1 is that the mass concentration of intermediate solution is different, specifically comprises the following steps:

[0050] 1. Fully mix dimethyldiallylammonium chloride, octadecyldimethylallyl ammonium chloride, acrylamide, and acryloylmorpholine in distilled water at a mass ratio of 7:0.2:1.8:1 , prepared as an intermediate solution with a mass concentration of 40%, adding glacial acetic acid and sodium carbonate as a pH regulator until the pH of the intermediate solution reaches 6.3, and placing the intermediate solution in an oil bath for temperature control.

[0051] 2. Adjust the temperature of the oil bath to -3°C, and continuously feed 99.999% high-purity nitrogen into the intermediate solution. After 30 minutes, add ethylenediamine, ammonium persulfate, and hydrogen sulfite with a mass ratio of 5.5:3:1.5 A low-tempe...

Embodiment 3

[0055] The present embodiment provides a kind of preparation method of turning to acid thickener from thickening, and its difference with embodiment 1 is that the mass ratio between the solute of intermediate solution and the mass concentration of intermediate solution are different, specifically comprises the following steps:

[0056] 1. Fully mix dimethyldiallylammonium chloride, octadecyldimethylallyl ammonium chloride, acrylamide, and acryloylmorpholine in distilled water at a mass ratio of 8:0.2:0.8:1 , prepared as an intermediate solution with a mass concentration of 40%, adding glacial acetic acid and sodium carbonate as a pH regulator until the pH of the intermediate solution reaches 6.3, and placing the intermediate solution in an oil bath for temperature control.

[0057] 2. Adjust the temperature of the oil bath to -3°C, and continuously feed 99.999% high-purity nitrogen into the intermediate solution. After 30 minutes, add ethylenediamine, ammonium persulfate, and h...

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Abstract

The invention provides a self-tackifying diverting acid liquid thickening agent as well as a preparation method and application thereof. The self-tackifying diverting acid liquor thickening agent is a quaternary polymer which is formed by copolymerization of quaternary ammonium salt unsaturated monomers, long-chain unsaturated monomers, acrylamide monomers and rigid monomers, takes acrylamide as a main chain and contains hydrophobic groups. The invention also provides a preparation method of the self-tackifying diverting acid liquor thickening agent, which comprises the following step: by taking quaternary ammonium salt unsaturated monomers, long-chain unsaturated monomers, acrylamide and rigid monomers as raw materials, carrying out polymerization reaction at-5 to 5 DEG C for 3-5 hours to obtain the self-tackifying diverting acid liquor thickening agent. The invention also provides application of the self-tackifying diverting acid liquid thickening agent in acidification or acid fracturing yield increase construction. The self-tackifying diverting acid liquid thickening agent provided by the invention has the advantages of low concentration, friction resistance reduction and high temperature resistance when being applied to acidification or acid fracturing yield increase construction.

Description

technical field [0001] The invention relates to the technical field of acidification or acid fracturing stimulation in the development of carbonate rock oil and gas fields, in particular to a self-viscosifying thickening agent for acid liquid diversion and its preparation method and application. Background technique [0002] Carbonate reservoirs are generally characterized by well-developed fractures and strong heterogeneity. In the process of acidizing or acid fracturing, the acid liquid tends to preferentially enter the large pores or high-permeability layers, and due to the corrosion of the acid liquid, the large pores or high-permeability layers will be further expanded, forming a dominant channel for the acid liquid in the formation, resulting in low The reconstruction efficiency of the infiltrated dense layer is low, and this phenomenon is particularly prominent in the horizontal section of the naked hole. [0003] In order to achieve the purpose of uniform deep stimu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F226/02C08F220/56C08F220/58C09K8/74
CPCC08F226/02C09K8/74C08F220/56C08F220/58Y02P10/20
Inventor 王超崔明月叶玉峰陶冶张建利邓亚
Owner PETROCHINA CO LTD
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