Clean air foam cracking liquid

An air foam and clean technology, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of high cost, high surfactant concentration, unspecified clay stabilizer compatibility, etc., and achieve gel breaking speed Fast, low cost, and excellent sand-carrying ability

Inactive Publication Date: 2019-01-01
河北中大永迪生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantages of the fracturing fluid of the present invention: no clay stabilizer is added in the formula, and the compatibility between the clay stabilizer and the formula of the present invention is not explained; the high concentration of surfactant in the formula will lead to higher cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The specific steps for preparing 250g of clean foam fracturing fluid: First, add 5g of clay stabilizer potassium chloride to 240g of water, stir in a beaker until completely dissolved, and prepare a salt solution; then add 1.4g of anionic surfactant AOS to the brine , continue to stir until the anionic surfactant is evenly dissolved, and add the obtained mixed solution to the high-speed stirrer; turn on the high-speed stirrer, and add the zwitterionic surfactant oleic acid amidopropyl betaine 1.5 prepared in advance while stirring. g and 2.3 g of low-molecular-weight alcohol, continue to shear at a high speed to make a clean foam fracturing fluid.

[0030] according to figure 1 As shown, at 70°C, use a rheometer to test its viscosity-temperature curve. pass figure 1 It can be seen that the foam fracturing fluid of the present invention can be prepared by adding 0.55% anionic surfactant AOS and 0.6% zwitterionic surfactant oleic acid amidopropyl betaine at a lower dosa...

Embodiment 2

[0032]The specific steps for preparing 250g of clean foam fracturing fluid containing temperature stabilizers: first, add 5g of clay stabilizer potassium chloride to 239g of water, stir in a beaker until completely dissolved, and prepare a salt solution; then add 1.4 g anionic surfactant AOS, 0.5g foam stabilizer APG810, continue to stir until the anionic surfactant and foam stabilizer are uniformly dissolved, and add the resulting mixture to the high-speed stirrer; turn on the high-speed stirrer and add while stirring A mixture of 1.5 g of the zwitterionic surfactant oleic acid amidopropyl betaine and 2.3 g of low molecular weight alcohol prepared in advance was continuously sheared at a high speed to obtain a clean foam fracturing fluid containing a temperature stabilizer.

[0033] according to figure 2 As shown, at 70°C, use a rheometer to test its viscosity-temperature curve, through the figure 1 In contrast, after adding foam stabilizer APG810, the viscosity can be stab...

Embodiment 3

[0035] The specific steps for preparing 250g of clean foam fracturing fluid containing temperature stabilizers: first, add 5g of clay stabilizer potassium chloride to 238g of water, stir in a beaker until completely dissolved, and prepare a salt solution; then add 1.4 g anionic surfactant AOS, 0.5g foam stabilizer APG810, continue to stir until the anionic surfactant and foam stabilizer are uniformly dissolved, and add the resulting mixture to the high-speed stirrer; turn on the high-speed stirrer and add while stirring The mixed solution of 2.0 g of zwitterionic surfactant oleic acid amidopropyl betaine and 3.0 g of low molecular weight alcohol prepared in advance was sufficiently sheared at high speed to obtain a clean foam fracturing fluid containing a temperature stabilizer.

[0036] according to image 3 As shown, at 90°C, use a rheometer to test its viscosity-temperature curve, and compare figure 2 It can be seen that increasing the zwitterionic surfactant oleic acid a...

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Abstract

The invention provides a clean air foam cracking liquid. The clean air foam cracking liquid is prepared by mixing the following components in percentage by mass: 0.4% to 1.5% of zwitter-ion surfactant, 0.3% to 2.0% of composite cation ion surfactant, 0.0% to 0.5% of foam stabilizer, 0.5% to 3.0% of clay stabilizer, 0.6% to 2.05 of low-molecular alcohol, and the balance of water. The clean air foamcracking liquid has the advantages that the anion ion surfactant is not contained, so that the preparation is simple; after indoor evaluation, the foam quality can reach 55% to 80%, the foam qualityis high, the viscosity is high, and the sand carrying ability is excellent; by utilizing the surfactant beams to mutually wind and adhere, the crosslinking agent is not required, the adhesive breakingspeed is quick, and the permeability of the reservoir can be well protected because the anion ion surfactant is not contained after adhesive breaking and the adsorption with stratum dose not occur; under the condition of lower adding amount of surfactant, the better temperature-resistant property is obtained; the cost is low, and the preparation technology is simple.

Description

technical field [0001] The invention relates to the technical field of oil and gas resource development, in particular to a clean air foam fracturing fluid. Background technique [0002] Hydraulic fracturing technology has been widely used as an important means to increase production in oilfields, especially in unconventional oil and gas fields such as shale gas and coalbed methane that have attracted much attention. It has set off a technological revolution. In hydraulic fracturing construction, it plays an important role in transmitting pressure and carrying proppant, and is the key to hydraulic fracturing construction. [0003] Foam fracturing fluid is usually mixed with a certain concentration of air, nitrogen or carbon dioxide on the basis of the fracturing fluid, with the gas phase as the internal phase and the liquid phase as the external phase, and the low-harm fracturing fluid. The phase ratio is low. On the one hand, it can greatly reduce the filtration loss of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/70
CPCC09K8/68C09K8/703C09K2208/12
Inventor 魏振强马广华
Owner 河北中大永迪生物科技有限公司
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