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A two-phase temperature-responsive phase-change fracturing fluid system

A phase change fracturing, temperature response technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as fractures without flow channel conductivity, phase change materials entering natural fractures, etc., and achieve broad market application Prospects and the effect of ensuring the success of the construction

Active Publication Date: 2021-09-21
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these inventions have solved some major problems of solid-phase proppant injection in conventional hydraulic fracturing, they also have certain defects: phase-change materials may enter natural fractures and caves during the injection process, and at the same time, during the phase-change process Non-phase change materials may have no flow channels or extremely poor flow conductivity in fractures after phase change due to fluid loss

Method used

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  • A two-phase temperature-responsive phase-change fracturing fluid system

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Experimental program
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Effect test

Embodiment 1

[0019] Phase change fracturing fluid system 1, 50% non-phase change system A 1 , 50% phase change system B 1 , the ground is prepared separately, during construction, A 1 with B 1 In the wellbore 1:1 mixed injection formation, A 1 It consists of 10% gelling agent+2% regulator, and the rest is water; B 1 The composition is 70% monomer + 1.5% crosslinking agent + 1% dispersant, and the rest is water.

[0020] A 1 The specific composition is: 8% N-methyl-D-glucosamine hydrochloride + 2% carboxymethyl chitosan + 0.5% NH 4 Cl+1% formaldehyde+0.5% ethylenediamine, the rest is water.

[0021] per 100g A 1 Preparation process: Measure 88g of water, then slowly add 8g of N-methyl-D-glucosamine hydrochloride, 2g of carboxymethyl chitosan, 0.5g of NH 4 Cl, 1g of hexamethylenetetramine, 0.5g of ethylenediamine, the preparation is complete until the mixture is evenly stirred.

[0022] B 1The specific composition is: 30% styrene + 30% divinylbenzene + 10% methyl methacrylate + 1% ...

Embodiment 2

[0025] Phase change fracturing fluid system 2, 55% non-phase change system A 2 , 45% phase change system B 2 , the ground first prepared A 2 , B 2 After that, put A 2 , B 2 Mix well and inject into the ground. A 2 It consists of 15% gelling agent+3% regulator, and the rest is water; B 2 The composition is 60% monomer + 1.5% crosslinking agent + 1% dispersant, and the rest is water.

[0026] A 2 The specific composition is: 5% glucosamine hydrochloride + 5% N-methyl-D-glucosamine hydrochloride + 3% carboxymethyl chitosan + 2% chitosan + 0.5% citric acid + 1% acetamide + 1% glutaraldehyde + 0.5% trimethyl phosphate, the rest is water.

[0027] per 100g A 2 Preparation process: Measure 82g of water, then slowly add 5g of glucosamine hydrochloride, 5g of N-methyl-D-glucosamine hydrochloride, 3g of carboxymethyl chitosan, 2g of chitosan while stirring , 0.5g of citric acid, 1g of acetamide, 1g of glutaraldehyde, 0.5g of trimethyl phosphate, and the preparation is complet...

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Abstract

The invention relates to a two-phase temperature-responsive phase-change fracturing fluid system, comprising 50-70% by weight of non-phase-change system A and 30-50% by weight of phase-change system B. The non-phase-change system A is composed of the following components by weight percentage: gel forming agent 1-35%, regulator 0.1-3%, and the rest is water. The phase change system B is a supramolecular compound or a synthetic polymer compound; the supramolecular compound is composed of the following components by weight percentage: supramolecular building unit 10-40%, supramolecular functional unit 0-40%, surfactant 0.5% ‑2%, inorganic salt 0‑5%, oxidizing agent 0.5‑2%, cosolvent 0‑2%, and the rest is solvent; synthetic polymer compound is composed of the following components by weight percentage: monomer 20‑80%, crosslinking 0.5-2% of the agent, 0.5-2% of the dispersant, and the rest is water. The invention utilizes the temperature response difference between the non-phase-change system and the phase-change system to realize safe and effective phase-change fracturing construction, which reduces the risk of phase-change fluid loss after phase-change fluid loss and affects the formation conductivity after fracturing, and has broad application potential. market application prospects.

Description

technical field [0001] The application relates to a phase-change fracturing fluid system utilizing natural geothermal field to realize clean phase-change fracturing in the field of oilfield chemistry, in particular to a two-phase temperature-responsive phase-change fracturing fluid system. Background technique [0002] Hydraulic fracturing technology has been widely used in the development of oil and gas fields as the main measure for oil and gas well stimulation and water well injection, and has made important contributions to the stable production and injection of oil and gas fields. Hydraulic fracturing is to pump high-viscosity pre-fluid into the target reservoir to form and extend fractures at high pressure, and then pump sand-carrying fluid mixed with proppant. The sand-carrying fluid can continue to extend the fracture and carry proppant deep into the fracture. For fractures, it is best to degrade the fracturing fluid into a low-viscosity fluid and flow back to the bo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68C09K8/88
CPCC09K8/685C09K8/887
Inventor 刘义刚孟祥海邹剑刘长龙张丽平高尚杜娟徐昆符扬洋张璐兰夕堂
Owner CHINA NAT OFFSHORE OIL CORP
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