Continuous self-heating gas production system for oil field fracturing fluid and preparation method thereof

An oilfield fracturing and self-generating heat technology, which is applied in chemical instruments and methods, heat exchange materials, drilling compositions, etc., can solve problems such as lowering the viscosity of crude oil, inability to effectively act on gas, and inability to effectively heat reservoirs with heat , to achieve the effects of reducing crude oil viscosity, destroying capillary resistance, and improving oil displacement efficiency

Active Publication Date: 2021-02-05
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006]The heat generated by the existing self-generating fracturing fluid system cannot effectively heat the reservoir, and the gas generated cannot effectively act on the target reservoir to reduce the viscosity of crude oil and supplement For the problem of formation e

Method used

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  • Continuous self-heating gas production system for oil field fracturing fluid and preparation method thereof
  • Continuous self-heating gas production system for oil field fracturing fluid and preparation method thereof
  • Continuous self-heating gas production system for oil field fracturing fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0021] Example 1

[0022] Screening of heat generation system:

[0023] The self-generating heat systems commonly used in oilfields are mainly nitrite and ammonium salts, polyhydroxy aldehyde oxidation heat generation, metal heat generation, carbonamide and nitrite, and hydrogen peroxide heat generation. The reaction equations and reaction heat generation of each substance are as follows:

[0024] NH 4 CL+NaNO 2 →NaCL+N 2 +H 2 O, ΔH=-332.58kJ / mol (1)

[0025] C 6 h 12 o 6 +CrO 3 +3H + →Cr 3+ +C 5 h 10 o 5 +CO 2 , ΔH=-107.02kJ / mol (2)

[0026] 2Na+2H 2 0→2NaOH+H 2 , ΔH=-184.8kJ / mol (3)

[0027] CO(NH 2 ) 2 +2NaNO 2 +2HCL→2NaCL+2N 2 +CO 2 +3H 2 O, ΔH=-426.00kJ / mol (4)

[0028] 2H 2 o 2 →O 2 +H 2 O, ΔH=-196.00kJ / mol (5)

[0029] By comparing different heat generation reactions, under the same mole number of reactants, the heat generation system composed of carbonamide and nitrite has the highest heat release, and 1moL carbonamide also produces 2moL n...

Example Embodiment

[0030] Example 2

[0031] Performance evaluation of continuous self-generated heat gas production system:

[0032] Heat generation capacity and gas production capacity are the core performances of the continuous self-generating heat and gas production system. The heat generated by the continuous self-generating heat and gas production system can increase the temperature of the fracturing fluid and the reservoir, and improve the flow capacity of the fracturing fluid and crude oil in the reservoir , the gas production capacity of the continuous self-generating heat gas production system directly affects the field use effect of fracturing fluid, and the high gas production system can effectively reduce the viscosity of crude oil and improve the oil displacement efficiency and sweep coefficient of fracturing fluid.

[0033] Therefore, it is necessary to evaluate the performance of the continuous self-generation heat generation system, and determine the proportion of each component...

Example Embodiment

[0043] Example 3

[0044] Preparation of Emulsion in Component C

[0045] (1) Determine the amount of emulsifier

[0046] With a concentration of 5% hydrochloric acid solution as the water phase, cyclohexane as the oil phase, and Span-80 as the emulsifier, prepare the emulsion in component C, and study the optimal amount of the emulsifier. The specific process is as follows:

[0047] A 5% hydrochloric acid solution and cyclohexane were mixed and divided into 4 equal solutions;

[0048] Dyeing the mixed solution composed of hydrochloric acid and cyclohexane;

[0049] Add an equal amount of emulsifiers that are successively 500mg / L, 1000mg / L, 1500mg / L, and 2000mg / L in the mixed solution of each hydrochloric acid and cyclohexane, and stir to obtain a water-in-oil emulsion after stirring for 30min. Add the emulsion into water, and determine the optimal amount of emulsifier by observing the structure of each emulsion droplet;

[0050] It has been observed that when the emulsifi...

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Abstract

The invention provides a continuous self-heating gas production system for oilfield fracturing fluid and a preparation method of the continuous self-heating gas production system, and relates to the field of oilfield recovery ratio improvement. The continuous self-heating gas production system comprises a component A, a component B and a component C. The component A comprises carbamide, the component B comprises sodium nitrite, the component C comprises hydrochloric acid and emulsion, the emulsion comprises cyclohexane, a Span-80 emulsifier and hydrochloric acid, the oil-water ratio is 5: 1, the emulsion demulsification time is 42 min, and the temperature reaches 80 DEG C or above within 12 min after the system is prepared. The temperature is maintained at 50 DEG C or above within 40 min,and after the reaction is conducted for 40 min, emulsion in the component C is gradually demulsified to release hydrochloric acid to continue the reaction with the remaining ammonium carbonate and sodium nitrite. According to the continuous self-heating gas production system, a fracturing fluid and a reservoir are heated, the generated gas can reduce the viscosity of crude oil, the sweep efficiency is improved at the unswept position of the fracturing fluid, the fracturing effect and the oil displacement efficiency of the fracturing fluid are effectively improved, and a foundation is laid forimproving the performance of the fracturing fluid.

Description

technical field [0001] The invention relates to the field of enhanced oil recovery in oilfields, in particular to a continuous self-generated heat gas production system for oilfield fracturing fluid and a preparation method thereof. Background technique [0002] For low-pressure and low-temperature reservoirs with shallow reservoirs and heavy oil reservoirs with high quality colloids and asphalt, the injection of conventional cold fracturing fluids will not only reduce the formation temperature, but also cause wax precipitation and solidification of the crude oil, resulting in an increase in the viscosity of the crude oil. and the conventional fracturing fluid cannot effectively enter the formation pores due to high surface tension and high oil-water interfacial tension, and the recovery effect of crude oil, especially heavy oil, is not ideal, which leads to the rate of post-fracture flowback and recovery. Yield reduction. [0003] CN110847871 discloses a self-generating ag...

Claims

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Application Information

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IPC IPC(8): C09K8/592C09K8/66C09K8/68C09K8/60C09K8/84C09K8/86C09K5/18
CPCC09K8/665C09K8/68C09K8/592C09K8/602C09K8/845C09K8/86C09K5/18
Inventor 曲占庆樊家铖郭天魁齐宁罗明良唐梅荣吴飞鹏芮振华陈铭刘晓强
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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