Ultrahigh-temperature organic crosslinking fracturing fluid system

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

Active Publication Date: 2022-03-22
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Ultrahigh-temperature organic crosslinking fracturing fluid system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The preparation process of supramolecular star polymer 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-neck flask, add 100 mL of dry pyridine at room temperature, stir magnetically, and dissolve evenly. After it was completely dissolved, a pyridine solution of p-toluenesulfonyl chloride (16.9 g, 88.6 mmol) was added under ice-water bath conditions. After the dropwise addition, the reaction system was raised 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 diethyl ether respectively; Vacuum-dried to obtain white solid 6-position p-toluenesulfonyl β-cyclodextrin ester, denoted as Ts-β-CD, and the product yield was about 85%;

[0048]...

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: 0.6wt% supramolecular star polymer, 0.75wt% formaldehyde solution, 0.025wt% resorcinol, 0.1wt% ammonium bicarbonate , and the rest is water. The components are mixed and stirred uniformly to obtain the fracturing fluid.

[0058] in the 170s -1 、 The curve of apparent viscosity of the fracturing fluid system with time was tested at 220°C, as shown in figure 2 shown. from figure 2 It can be seen that the apparent viscosity of the fracturing fluid system first decreases and then increases, and then remains stable after the decrease. After shearing for 120 minutes, the apparent viscosity of the fracturing fluid remains above 100 mPa·s, which meets the requirements of ultra-high temperature fracturing. 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: 0.6wt% supramolecular star polymer, 0.75wt% formaldehyde solution, 0.025wt% resorcinol, 0.1wt% ammonium acetate, The rest is water. The components are mixed and stirred uniformly to obtain the fracturing fluid.

[0062] in the 170s -1 、 The curve of apparent viscosity of the fracturing fluid system with time was tested at 220°C, as shown in image 3 shown. from image 3 It can be seen that the apparent viscosity of the fracturing fluid system first decreases, then increases, then decreases and finally remains stable. After shearing for 120 minutes, the apparent viscosity of the fracturing fluid remains at about 125 mPa·s, which meets the needs of ultra-high temperature fracturing. .

[0063] in the 170s -1 , and the curve of the apparent viscosity of the fracturing fluid system v...

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Abstract

The invention relates to a superhigh-temperature organic crosslinking fracturing fluid system which is prepared from the following components in percentage by mass: 0.6 wt% of a supramolecular star polymer, 0.5-1.0 wt% of a formaldehyde solution, 0.02-0.04 wt% of resorcinol, 0.05-0.2 wt% of an ammonium salt catalyst and the balance of water, the supramolecular star polymer is a supramolecular star polymer formed by taking a beta-cyclodextrin modified branched monomer F-beta-CD as an inner core and grafting acrylamide, acrylic acid, a hydrophobic monomer and a surface active macromonomer, the ammonium salt catalyst is one or more of ammonium chloride, ammonium bicarbonate, ammonium acetate, ammonium citrate, ammonium benzoate and ammonium oleate. The supramolecular star polymer is used as a thickening agent, the organic cross-linking agent is used as a cross-linking agent, and the ammonium salt is used as a catalyst, so that the fracturing fluid which is low in cost, appropriate in cross-linking time and stable in viscosity under an ultrahigh-temperature condition is formed, and the fracturing fluid is suitable for field large-scale popularization and application and has a wide market prospect.

Description

technical field [0001] The invention belongs to the field of oil and gas field stimulation, and in particular relates 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), dense in lithology, and high in 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, The terpolymer FA-313 was prepared by aqueous solution polymerization, and the fracturing fluid formula formed was: 0.6% FA-313 ter...

Claims

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Application Information

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Patent Type & Authority Applications(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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