Hot dry rock chemical fracturing fluid

A hot dry rock and fracturing fluid technology, applied in the direction of organic chemistry, chemical instruments and methods, compounds of group 5/15 elements of the periodic table, etc., can solve corrosion, affect thermal reservoir permeability, and prevent thermal reservoir Deep penetration and other issues to achieve the effect of expanding the penetration distance and improving permeability

Inactive Publication Date: 2016-04-06
JILIN UNIV
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  • Summary
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  • Claims
  • Application Information

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Problems solved by technology

However, in the high-temperature environment of thermal reservoirs, the reaction speed of soil acid and rock mass minerals is very fast, and it disappears near the injection site, making it impossible to penetrate deep into the thermal reservoir; secondly, the reaction between HF and rock mass minerals will produce Precipitates such as silicic acid, metasilicate, and fluoride can block fracture channels, thereby significantly affecting the permeability of thermal reservoirs; thirdly, earth acid has strong corrosion, which is more serious for wells and casing strings.

Method used

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  • Hot dry rock chemical fracturing fluid
  • Hot dry rock chemical fracturing fluid
  • Hot dry rock chemical fracturing fluid

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preparation example Construction

[0031] The preparation method of dry hot rock chemical fracturing fluid, in order of mass percentage: fluoroboric acid (HBF 4 ) 2% to 8%, polyamino polyether methylene phosphonic acid (PAPEMP) 2.5% to 10%, water 79 to 85.5% and aluminum chloride hexahydrate (AlCl 3 ·6H 2 O) 3% to 10% mixed into dry hot rock chemical fracturing fluid.

[0032] Synthesis of polyaminopolyether methylenephosphonic acid: To a four-necked flask equipped with a reflux condenser, a thermometer, a constant pressure dropping funnel and a magnetic stirrer, add 4.62 g of amino-terminated polyether (degree of polymerization n=2.6) , phosphorous acid 16.4g, deionized water 7.5ml. Add 5 mL of concentrated hydrochloric acid in multiples, 1 to 2 mL each time. Heat the oil bath to 105°C, keep stirring, and add 3g of formaldehyde solution to the flask during reflux condensation to ensure that the dropwise addition time is not less than 50min. After the dropwise addition, continue to reflux for 3.5h and distil...

Embodiment 1

[0035] In turn, 10g of HBF with a mass fraction of 40% 4 , 12.5g mass fraction is 40% PAPEMP, 72.5g water, 5g AlCl 3 ·6H 2 O solid is placed in a vessel and mixed to make a dry hot rock chemical fracturing fluid. Dissolution experiments were carried out on the tuff samples of the Yingcheng Formation in the Songliao Basin, a typical thermal reservoir of EGS. The experimental results are as follows:

[0036]

Embodiment 2

[0042] In turn, the mass fraction of 5g was 40% HBF 4 , 12.5g mass fraction of 40% PAPEMP, 77.5g water, 5g AlCl 3 ·6H 2 O solid is placed in a vessel and mixed to make a dry hot rock chemical fracturing fluid. The dissolution test was carried out on the tuff sample of the Yingcheng Formation in the Songliao Basin, a typical thermal reservoir of EGS. The reaction time was 24 hours, and the dissolution rate of the rock sample was 13.7%.

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Abstract

The invention relates to chemical fracturing fluid for hot dry rock, which is prepared by mixing fluoboric acid, polyamino polyether methylene phosphonate and aluminum chloride hexahydrate. After the prepared chemical fracturing fluid is injected into a thermal reservoir of the hot dry rock, fluoboric acid is hydrolyzed to generate HF (hydrogen fluoride) gradually, the reaction speed with a stratum is lower, and deep penetration can be achieved. Polyamino polyether methylene phosphonate as polyatomic acid, can be decomposed into hydrogen ions at multiple stages, acts on the stratum for a long time, extends a penetration distance of chemical fracturing, further achieves a deep thermal reservoir transformation effect and has performance such as low speed, low damages, scale prevention and corrosion inhibition; simultaneously, phosphonate of polyamino polyether methylene phosphonate has significant absorption and water-dampness characteristics which can catalyze reaction between hydrofluoric acid and quartz and allow the corrosion speed of the quartz to be increased with time; and the improvement on the radial deep penetrability of the reservoir is facilitated.

Description

Technical field: [0001] The invention relates to a technology for developing and enhancing thermal reservoirs of a geothermal system for hot dry rock, in particular to a chemical fracturing fluid used in a geothermal well plug removal treatment process. Background technique: [0002] Geothermal resources have become the renewable clean energy researched and developed by countries all over the world because of their clean renewability and extensive spatial distribution. They are mainly divided into hydrothermal type and dry-hot rock type. The world's current exploitation and utilization of geothermal resources are mainly hydrothermal geothermal. Hot dry rock is a hot rock mass without water or steam, mainly various metamorphic or crystalline rock mass. Hot dry rocks are generally buried at a depth of 3-10 km from the surface, and their temperature ranges from 150 to 650 °C. At this stage, hot dry rock geothermal resources refer to hot rock bodies with shallow burial depth, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68C07F9/38
CPCC07F9/3808C09K8/74
Inventor 那金许天福吴永东鲍新华冯波魏铭聪
Owner JILIN UNIV
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