Chemical fracturing fluid for hot dry rock

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: 2014-03-12
JILIN UNIV
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  • 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 ro

Method used

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  • Chemical fracturing fluid for hot dry rock
  • Chemical fracturing fluid for hot dry rock
  • Chemical fracturing fluid for hot dry rock

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preparation example Construction

[0031] The preparation method of hot dry rock chemical fracturing fluid, according to the mass percentage: fluoboric acid (HBF 4 ) 2% to 8%, polyamino polyether group 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 to make hot dry rock chemical fracturing fluid.

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

Embodiment 1

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

[0036]

Embodiment 2

[0042] Turn 5g mass fraction into 40%HBF 4 , 12.5g mass fraction is 40% PAPEMP, 77.5g water, 5gAlCl 3 ·6H 2 O solids are placed in a vessel and mixed to make hot dry rock chemical fracturing fluid. The dissolution test was carried out on the tuff rock samples 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 samples 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 hot dry rock development enhanced thermal reservoir transformation technology of a geothermal system, in particular to a chemical fracturing fluid used in a geothermal well deblocking treatment process. Background technique: [0002] Geothermal resources, due to their clean, renewable and extensive spatial distribution, have become a renewable and clean energy that is mainly researched and developed by countries all over the world. They are mainly divided into hydrothermal type and dry hot rock type. The world's current mining and utilization of geothermal resources are mainly hydrothermal geothermal. Hot dry rock is a hot rock mass without water or steam, mainly various metamorphic rocks or crystalline rocks. Hot dry rock is generally buried at a depth of 3-10km from the surface, and its temperature range is very wide, between 150-650°C. At present, hot dry rock geothermal resources refer to hot rock masses with shallow b...

Claims

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Application Information

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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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