Polyhydroxy thickener, high-temperature-resistant alcohol-based fracturing fluid system and application of high-temperature-resistant alcohol-based fracturing fluid system

A thickening agent, polyhydroxyl technology, applied in the fields of mining fluids, drilling compositions, earthwork drilling, etc., can solve the problems of limited application, poor safety, and large formation damage, and achieve high flowback rate and high The effect of temperature resistance and formation damage is small

Active Publication Date: 2020-08-25
北京九恒质信能源技术有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] In view of the above-mentioned defects or deficiencies in the prior art, the present application expects to provide a polyhydroxy thickener for alcohol-based fracturing fluid and a high-temperature-resistant alcohol-based fracturing fluid system, in order to solve the problem of existing alcohol-based fracturing fluid It is a technical problem of limited application under high temperature conditions, poor safety, and large formation damage

Method used

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  • Polyhydroxy thickener, high-temperature-resistant alcohol-based fracturing fluid system and application of high-temperature-resistant alcohol-based fracturing fluid system
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  • Polyhydroxy thickener, high-temperature-resistant alcohol-based fracturing fluid system and application of high-temperature-resistant alcohol-based fracturing fluid system

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preparation example Construction

[0042] In the present application, the polymerization reaction may be initiator-induced polymerization, heat-induced polymerization, photo-induced polymerization, radiation polymerization, and the like. In some preferred embodiments, the present application uses an in-situ polymerization method based on a redox reaction to obtain the polyhydroxy thickener, and the preparation method includes the following steps:

[0043] Dissolve acrylamide, N-vinylpyrrolidone and N-acrylamidopropyl-N, N, N-dimethyl hydroxyethyl ammonium chloride in water 2 to 4 times the total mass of the monomer, stir to dissolve; then add 3-5% urea and 0.01-0.05% EDTA of the total monomer mass are fully dissolved to obtain a mixed solution;

[0044] At 15-30°C, after passing nitrogen into the mixed solution for 30 minutes, add 0.001-0.01% of oxidation initiator, 0.001-0.01% of reduction initiator and 0.001-0.02% of co-initiator to the total mass of the monomers, and polymerize After reacting for 3-6 hours,...

Embodiment 1

[0069] Preparation of N-acrylamidopropyl-N, N, N-dimethylhydroxyethylammonium chloride (MPP):

[0070] In a 500mL three-necked flask, add 120.0g of N,N-dimethylaminopropyl acrylamide, then add 110mL of ethanol, raise the temperature to 50°C, slowly add 68.0g of 2-chloroethanol dropwise, continue the reaction for 12h after the dropwise addition, and then vacuum The solvent ethanol is distilled off to obtain the MPP monomer.

[0071] Among them, the molecular structural formula of the MPP monomer is as follows, and the infrared identification spectrum of the MPP monomer is as follows figure 1 shown.

[0072]

[0073] from figure 1 It can be seen that the FTIR spectrum of the MPP monomer is at 3354.54cm -1 exist-conh 2 In the group -NH 2 The stretching vibration absorption peak is at 1651.29cm -1 exist-conh 2 The stretching vibration absorption peak of the C=O bond in the group is at 1379.23cm -1 and 1454.70cm -1 There are characteristic peaks of methyl groups.

Embodiment 2

[0075] The preparation of polyhydroxy thickener POP-1:

[0076] In a 1L beaker, add 538.0g deionized water, add comonomer acrylamide (AM) 173.0g, N-vinylpyrrolidone (NVP) 25.2g, N-acrylamidopropyl-N, N, N-dimethylhydroxyethylammonium chloride (MPP) 11.3g, then add 8.5g of urea, 0.025gEDTA to dissolve fully; at a temperature of 18°C, then transfer the above mixed solution to a 1L polymerization bottle, pass After nitrogen gas for 30 minutes, add 2.4ml of prepared 1% potassium persulfate solution, 2.4ml of prepared 1% sodium bisulfite solution, and 4ml of prepared 1% azobisisobutylamidine hydrochloride solution , seal the polymerization bottle, wait for the reaction for 6 hours, take out the rubber block, granulate, dry, crush, and sieve to obtain the polyhydroxy thickener POP-1.

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Abstract

The invention discloses a polyhydroxy thickener and a high-temperature-resistant alcohol-based fracturing fluid system. The polyhydroxy thickening agent is formed by copolymerizing three monomers, namely acrylamide, N-vinylpyrrolidone and N-acrylamide propyl-N,N,N-dimethyl hydroxyethyl ammonium chloride, in an aqueous solution; and based on the total mass of the monomers, the mass ratios of acrylamide, N-vinylpyrrolidone and N-acrylamide propyl-N,N,N-dimethyl hydroxyethyl ammonium chloride are 40-85%, 5-35% and 3-25%, respectively. The high-temperature-resistant alcohol-based fracturing fluidsystem is prepared from the following raw materials: the polyhydroxy thickener, a composite cross-linking agent, a regulator, high-flash-point alcohol and water. According to the alcohol-based fracturing fluid system disclosed by the invention, the polyhydroxy thickening agent is introduced, so the alcohol-based fracturing fluid system has relatively high temperature resistance and shearing resistance, and can resist a temperature of 160 DEG C or above; by using the high-flash-point alcohol, the fracturing system is safer; and an alcohol/water ratio can be increased to 60% or above, even an anhydrous system with the alcohol/water ratio of 100% can be realized, so the fracturing fluid system has the advantages of high flowback rate, small stratum damage, safety, environment friendliness andthe like.

Description

technical field [0001] The invention belongs to oil exploitation technology, in particular to a polyhydroxy thickener, a high-temperature-resistant alcohol-based fracturing fluid system and applications thereof. Background technique [0002] For the development of tight and low-permeability oil and gas reservoirs, large-scale hydraulic fracturing is one of the conventional stimulation techniques. However, due to the small pore throat radius of tight oil reservoirs, after fracturing, the fracturing fluid filtrate and gel breaking fluid will enter the seepage channel under the action of capillary force and pressure difference, and it is difficult to discharge, forming water lock damage, resulting in oil and gas The relative permeability decreases, and the oil and gas production decreases. At the same time, for some water-sensitive and alkali-sensitive formations, due to large-scale water soaking and the partial alkalinity of the traditional guar gum thickener fracturing syste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/88C08F220/56C08F226/10C08F220/60E21B43/26
CPCC09K8/685C09K8/882C09K8/604C08F220/56E21B43/26C08F226/10C08F220/603
Inventor 徐文熙
Owner 北京九恒质信能源技术有限公司
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