Thermotropic supermolecule gel temporary-plugging deflection fracturing fluid
Active Publication Date: 2016-12-07
赵立强 +2
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Abstract
Description
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Problems solved by technology
At present, there are more studies on single-component gelation factors, but less research on two-component or multi-component gelation factors
Method used
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Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0018] Preparation of (PSA-1) n-decyl alcohol supramolecular steering fracturing fluid:
[0019] First take 5Ml (4.74g) N,N-dimethylformamide (DMF), then add cyclodextrin (0.95g), lithium chloride (0.024g), n-decyl alcohol (0.2g) to it, and methyl base cellulose-4000 (0.1g), and then stir evenly to complete the preparation.
[0020] Put the prepared diverting fracturing fluid into an oil bath, stir and heat, observe the phenomenon every 5°C from room temperature, and record the initial gelation temperature and final gelation temperature. N-decyl alcohol is liquid from 25°C to 60°C, becomes turbid at 60°C and starts to gel, turns into a milky white gel at 70°C, completely gels at 75°C, and turns from solid gel to liquid phase at 90°C At 115°C, all the solid gels returned to liquid.
Embodiment 2
[0022] Preparation of (PSA-2) n-undecyl alcohol supramolecular steering fracturing fluid:
[0023] First take 5Ml (4.74g) N,N-dimethylformamide (DMF), then add cyclodextrin (0.85g), lithium chloride (0.036g), n-undecyl alcohol (0.3g) to it respectively, Methylcellulose-400 (0.3g), then stir evenly to complete the preparation.
[0024] Stir and heat the prepared fracturing fluid bath, observe the phenomenon every 5°C from room temperature, and record the initial gelation temperature and final gelation temperature. N-undecyl alcohol is liquid from 25°C to 90°C, becomes turbid at 90°C, completely gelatinized at 95°C, solid gel to liquid phase transformation begins at 120°C, and all solid gels recover at 125°C for liquid.
Embodiment 3
[0026] Preparation of (PSA-3) n-dodecyl alcohol diverted fracturing fluid:
[0027] First get 5Ml (4.74g) N,N-dimethylformamide (DMF), then add cyclodextrin (0.75g), lithium chloride (0.048g), n-dodecyl alcohol (0.4g) to it respectively, Methylcellulose-10000 (0.05g), then stir evenly to complete the preparation.
[0028] Put the prepared diverting fracturing fluid into an oil bath, stir and heat, observe the phenomenon every 5°C from room temperature, and record the initial gelation temperature and final gelation temperature. N-dodecyl alcohol is liquid from 25°C to 115°C, becomes turbid at 115°C, completely gelatinized at 120°C, solid gel to liquid phase transformation begins at 145°C, and all solid gels return to liquid.
[0029] Table 1 Gelling temperature record of diverted fracturing fluid
[0030] sample
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Abstract
The invention discloses a thermotropic supermolecule gel temporary-plugging deflection fracturing fluid. The thermotropic supermolecule gel temporary-plugging deflection fracturing fluid is prepared from, by weight, 10% to 35% of cyclodextrin, 0.5% to 3.5% of lithium chloride, 1.3% to 15% of fatty alcohol, 0.3% to 10% of methylcellulose and the balance N,N-dimethyl formamide. The number of C atoms of the fatty alcohol is 10 to 18, and the weight-average molecular weight of the methylcellulose is 400 to 10,000. By means of the thermotropic supermolecule gel temporary-plugging deflection fracturing fluid, temperature-controlled gelling can be achieved, a user does not need to add other temporary-plugging agents, and formed gel is stable and resistant to shearing, and can be restored into the gel shape after being sheared; as the supermolecule gel temporary-plugging deflection fracturing fluid is composed of micromolecules, the re-arranging effect can be easily achieved after gel breaking, and residual damage to a reservoir can be avoided. The thermotropic supermolecule gel temporary-plugging deflection fracturing fluid is suitable for fracturing transforming of oil and gas fields, and has broad market prospects.
Description
technical field [0001] The invention relates to a temperature-controlled temporary plugging diversion fracturing fluid in the field of hydraulic fracturing stimulation in the petroleum development process, in particular to a heat-induced supramolecular gel temporary plugging diversion fracturing fluid. Background technique [0002] Fracturing fluids have evolved dramatically since they were first used to stimulate fractures in 1947. The early stimulation treatment was to add viscous fluid enough to open and extend fractures by adding to gasoline; later, guar gum and modified guar gum working fluid, synthetic polymer fracturing fluid, viscoelastic surfactant ( VES) fracturing fluid, etc. Guar gum and synthetic polymer fracturing fluids are formulated into polymer solutions on the ground and then injected into the formation. They all use the characteristics of high molecular weight to increase the viscosity of the fracturing fluid. After the gel is broken, there will be polym...
Claims
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Application Information
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