An ultra-high temperature organic cross-linked fracturing fluid system

A fracturing fluid and ultra-high temperature technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of short cross-linking time, unfavorable control of fracture height, difficulty in on-site fluid dispensing, etc., and achieve long cross-linking time. , reduce the risk of hydrolysis, and facilitate the effect of on-site preparation

Active Publication Date: 2022-07-15
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the existing ultra-high temperature fracturing fluids are mainly in the form of artificially synthesized polymers and organometallic cross-linking. The cross-linking time is short, ranging from less than 100s to no more than 15 minutes. Cause sand jam, sand blockage and other accidents, which is also not conducive to the control of joint height

Method used

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  • An ultra-high temperature organic cross-linked fracturing fluid system
  • An ultra-high temperature organic cross-linked fracturing fluid system
  • An ultra-high temperature organic cross-linked fracturing fluid system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The preparation process of supramolecular star polymers is as follows:

[0046] Step S1: Preparation of β-cyclodextrin modified branched monomer F-β-CD:

[0047] S11: Add freshly dried β-CD (14.0 g, 12.3 mmol) into a three-necked flask, add 100 mL of dry pyridine at room temperature, stir magnetically, and dissolve uniformly. After it was completely dissolved, a pyridine solution of p-toluenesulfonyl chloride (16.9 g, 88.6 mmol) was added under an ice-water bath. After the dropwise addition, the reaction system was warmed to room temperature and reacted for 24 hours. The solvent pyridine was recovered by rotary evaporation, the crude product was poured into a large amount of cold water, and the white precipitate was obtained by suction filtration, which was washed with 100 mL of water and 100 mL of ether respectively; at 62-65 °C, the crude product was stirred in methanol for 30 min, and suction filtered; at 40 °C Vacuum drying to obtain a white solid all 6-position p...

Embodiment 2

[0056] The preparation of the supramolecular star polymer is the same as in Example 1.

[0057] An ultra-high temperature organic cross-linked fracturing fluid system, the formula of which is calculated in mass percentage as follows: supramolecular star polymer 0.6wt%, formaldehyde solution 0.75wt%, resorcinol 0.025wt%, ammonium bicarbonate 0.1wt% , and the rest is water. The fracturing fluid is obtained after mixing and stirring the components uniformly.

[0058] in the 170s -1 , 220 ℃ to test the apparent viscosity change curve of the fracturing fluid system with time, such as figure 2 shown. from figure 2 It can be seen that the apparent viscosity of the fracturing fluid system first decreased and then increased, and remained stable at the end of the decrease. need.

Embodiment 3

[0060] The preparation of the supramolecular star polymer is the same as in Example 1.

[0061] An ultra-high temperature organic cross-linked fracturing fluid system, the formula of which is calculated in mass percentage as follows: supramolecular star polymer 0.6wt%, formaldehyde solution 0.75wt%, resorcinol 0.025wt%, ammonium acetate 0.1wt%, The rest is water. The fracturing fluid is obtained after mixing and stirring the components uniformly.

[0062] in the 170s -1 , 220 ℃ to test the apparent viscosity change curve of the fracturing fluid system with time, such as image 3 shown. from image 3 It can be seen that the apparent viscosity of the fracturing fluid system first decreased, then increased, and finally remained stable. After 120 min of shearing, the apparent viscosity of the fracturing fluid remained at about 125 mPa·s, which met the needs of ultra-high temperature fracturing. .

[0063] in the 170s -1 , 240 ℃ to test the apparent viscosity change curve o...

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Abstract

The invention relates to an ultra-high temperature organic cross-linked fracturing fluid system, which is composed of the following components according to mass percentage: 0.6wt% of supramolecular star polymer, 0.5-1.0wt% of formaldehyde solution, and 0.02-0.04wt% of resorcinol %, the ammonium salt catalyst is 0.05 to 0.2wt%, and the rest are water; the supramolecular star polymer is based on the β-cyclodextrin modified branched monomer F-β-CD as the inner core, grafted acrylamide, Supramolecular star polymer formed from acrylic acid, hydrophobic monomer and surface active macromonomer; the ammonium salt catalyst is ammonium chloride, ammonium bicarbonate, ammonium acetate, ammonium citrate, ammonium benzoate, ammonium oleate one or more of them. The invention adopts supramolecular star polymer as thickening agent, organic cross-linking agent as cross-linking agent, and ammonium salt as catalyst to form fracturing fluid with lower cost, suitable cross-linking time and stable viscosity under ultra-high temperature conditions, It is suitable for large-scale promotion and use on site, and has broad market prospects.

Description

technical field [0001] The invention belongs to the field of oil and gas field stimulation, in particular to an ultra-high temperature organic cross-linked fracturing fluid system in the process of acid fracturing. Background technique [0002] Hydraulic fracturing technology is an unconventional reservoir stimulation technology with wide application prospects. An important means of economical and effective development of oil and gas resources such as deep well reservoirs [0003] Ultra-high temperature reservoirs are buried deep (greater than 7000m), with tight lithology and high temperature (generally over 200°C). Development requires ultra-high temperature fracturing fluids. In 2014, Zhai Wen et al. used 2-acrylamide-2-methylpropanesulfonic acid (AMPS), N-vinylpyrrolidone (NVP) and N,N-dimethylacrylamide (DMAM) as comonomers, Through aqueous solution polymerization, terpolymer FA-313 is prepared, and the fracturing fluid formula formed is: 0.6% FA-313 terpolymer thicke...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/512C09K8/88C09K8/90C09K8/514C08F251/00C08F220/56C08F220/06C08F220/54C08B37/16
CPCC09K8/512C09K8/882C09K8/887C09K8/905C09K8/514C08F251/00C08B37/0012C08F220/56C08F220/06C08F220/54C09K8/685C09K8/885
Inventor 李勇明孙天礼管彬任强常程朱炬辉朱国
Owner SOUTHWEST PETROLEUM UNIV
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