Multifunctional foam fracturing fluid and preparation method thereof

A foam fracturing fluid and multi-functional technology, applied in the field of foam fracturing fluid, can solve the problems of unable to carry proppant, reduce hydraulic fracture conductivity, consume hydrogen ions, etc.

Pending Publication Date: 2021-09-07
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the acidity is strong, the gas will be generated quickly, so the quality of the foam produced will be high, and the formed foam fracturing fluid will easily carry the proppant into the formation, but the strong acidity will also cause corrosion to the pipe string, causing safety hazards
If the acidity is weak, the corrosion of the pipe string will be weakened, but the gas generation is slow, and the foam is not easy to generate, so the proppant cannot be carried, and it is easy to cause sand plugging near the wellbore
At the same time, in the process of self-gas generation, hydrogen ions will be consumed, the acidity will be weakened, and the gas efficiency will slow down in the later stage, that is, the efficiency of foam generation will decrease
[0013] (2) For the selection of existing foam stabilizers, macromolecular polymers are mostly used as foam stabilizers, which will cause a lot of irreversible damage to low-porosity and low-permeability unconventional gas reservoirs such as shale gas and coalbed methane, seriously It will block the pores and greatly reduce the conductivity of hydraulic fractures

Method used

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  • Multifunctional foam fracturing fluid and preparation method thereof
  • Multifunctional foam fracturing fluid and preparation method thereof
  • Multifunctional foam fracturing fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 0.3wt% multifunctional agent and 0.3wt% initiator are mixed with different volume ratios, and the acid concentration curve at normal temperature is obtained. It can be seen from the figure that at normal temperature, multifunctional agent and initiator can be mixed In the next five minutes, the acid will be generated quickly, and when the volume ratio is 1:1, the concentration of the obtained acid solution will be the highest, that is, this ratio can reduce the pH value of the system environment to the lowest level, which is beneficial to the subsequent multifunctional agent and self-gasification Agents get angry under strong acidic conditions.

Embodiment 2

[0045] Mix 0.1 mol of multifunctional agent and 0.1 mol of self-generating agent at a volume ratio of 1:1 to form a 200ml solution, take half of the solution volume, adjust its pH value to 2, and adjust the pH value of the other half volume to 3.5. Put the two together in a water bath at 60°C, and measure the amount and speed of gas generation of the two in different time periods. See Table 1 below for specific data. It can be seen from the table that the stronger the acidity of the self-generating system, the greater the amount of gas generation and the higher the gas generation speed, which is more conducive to the subsequent generation of self-generating foam.

[0046] Table 1 At 60°C, the effect of pH value on the amount and speed of gas generation

[0047]

Embodiment 3

[0049] Mix 0.1 mol of multifunctional agent and 0.1 mol of self-generating agent at a volume ratio of 1:1 to form a 200ml solution, take half of the solution volume, adjust its pH value to 2, and adjust the pH value of the other half volume to 4.8. Put the two together in a water bath at 30°C, and measure the amount and speed of gas generation of the two in different time periods. See Table 2 below for specific data. It can be seen from the table that the stronger the acidity of the self-generating system, the greater the amount of gas generation and the higher the gas generation speed, which is more conducive to the subsequent generation of the self-generating foam system.

[0050]Table 2 The effect of pH value on the amount and speed of gas generation at 30°C

[0051]

[0052]

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PUM

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Abstract

The invention provides a multifunctional foam fracturing fluid and a preparation method thereof, and the multifunctional foam fracturing fluid is an aqueous solution, the solvents include a self-generating agent is sodium nitrite; a multifunctional agent is ammonium chloride; an initiator is paraformaldehyde; a foaming agent is one or more of tetradecyl trimethyl ammonium bromide, hexadecyl trimethyl ammonium bromide and didecyl dimethyl ammonium bromide; and a foam stabilizer is one or more of erucamide propyl betaine, oleamide propyl betaine, erucamide propyl hydroxy sulfobetaine and hexadecyl hydroxypropyl sulfobetaine. The corrosion of a strong acid environment to a tubular column is delayed, the supply of hydrogen ions is ensured, and the hydrogen ions are prevented from being continuously consumed under a gas generation condition; the self gas generation reaction is violent, the generated foam is more and stable, the proppant can be ensured to be carried into the deep position of the stratum, the sand blocking accident is not caused, a large amount of heat can be released, the adsorbed methane is desorbed, and the yield increasing efficiency of the foam fracturing fluid is improved.

Description

technical field [0001] The invention belongs to the technical field of foam fracturing fluid, and in particular relates to a multifunctional foam fracturing fluid and a preparation method thereof. Background technique [0002] Foam fracturing fluid has the advantages of high viscosity, strong sand-carrying capacity, low fluid loss, and rapid flowback. It has been applied in the hydraulic fracturing of unconventional natural gas resources such as shale gas, coalbed methane, and tight gas. However, foam fracturing fluid itself has high friction and low fluid column pressure, which limits its application in deep oil and gas hydraulic fracturing. In view of the above shortcomings, a self-generated foam fracturing fluid has been proposed at present. With the help of the gas spontaneously generated at the bottom of the well, the foam fracturing fluid is generated in the downhole and in the formation, avoiding the friction between the foam fracturing fluid and the wellbore string, ...

Claims

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Application Information

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IPC IPC(8): C09K8/70C09K8/74C09K8/592
CPCC09K8/703C09K8/74C09K8/592C09K2208/30
Inventor 朱静怡杨兆中李小刚谌光熊黄琴郑南鑫易良平
Owner SOUTHWEST PETROLEUM UNIV
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