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An evaluation method for screening guar gum fracturing fluid system
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A guar gum fracturing fluid and evaluation method technology, which is applied to instruments, measuring devices, scientific instruments, etc., can solve problems such as high cost of rheometers, poor contact, and instrument failures
Inactive Publication Date: 2020-12-29
SHAANXI RES DESIGN INST OF PETROLEUM CHEM IND
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However, due to the relatively high viscosity of the fracturing fluid, the use of a six-speed viscometer for measurement may easily lead to poor contact between the fracturing fluid and the rotor, resulting in poor accuracy of the measurement data. On the other hand, when the temperature is high, when measuring the viscosity It may be due to the large temperature error that the accuracy of the experimental data decreases, and the measurement range of the six-speed rotational viscometer is less than 100 degrees. Although the rheometer measurement can achieve certain results, the cost of the rheometer is high and the measurement time is long. For It is difficult to measure the system rheometer with a temperature greater than 120 degrees, and the instrument often fails due to excessive temperature
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Embodiment 1
[0025] 1) Set the temperature of the water bath to 70°C, and control the temperature change of the water bath to ±0.1°C.
[0026] 2) According to the system currently used in the market, prepare 500ml of base liquids with guar gum concentrations of 0.30% guar gum, 0.35% hydroxypropyl guar gum, 0.40% guar gum, and 0.45% hydroxypropyl guar gum, respectively, and place them for 4 hours.
[0027] 3) For the base liquid after standing for 4 hours, use 0.30% guar gum + 0.2% low-concentration organic boron cross-linking agent, 0.35% hydroxypropyl guar gum + 0.3% organic boron cross-linking agent, 0.40% guar gum + 15% borax Cross-linking agent, 0.45% hydroxypropyl guar gum + 0.2% organoboron cross-linking agent to investigate the viscosity and temperature resistance of different fracturing systems. The preparation method of the cross-linking liquid is: add the base liquid with the cross-linking agent into the mixing mixer to make it cross-linked. After the center of the cross-linking ...
Embodiment 2
[0032] 1) Set the temperature of the water bath (oil bath) to 80°C, and control the temperature change of the water bath to ±0.1°C.
[0033] 2) Prepare 500ml of base solutions with a guar gum concentration of 0.35% respectively, and place them for 4 hours.
[0034] 3) Add 0.20% of different cross-linking agents to the base liquid after standing for 4 hours, and then add a mixing mixer to make it cross-linked. After the center of the cross-linking liquid is slightly raised, place them in steel tanks respectively and tighten them with a wrench.
[0035] 4) Put all the fracturing fluid in the steel tank in a constant temperature water bath (oil bath) pot, and observe the changes in the readings of the microcontroller.
[0036] 5) Export the data stored in the single-chip microcomputer, such as figure 2 shown.
[0037] It can be seen from the experimental results that the cross-linking agent HK-325 has the best effect, followed by YJP-68, OB-320 and JLJ-218.
Embodiment 3
[0039] 1) Set the temperature of the water bath (oil bath) to 90°C, and control the temperature change of the water bath to ±0.1°C.
[0040] 2) Prepare 500ml of base solution with a guar gum concentration of 0.35%, respectively, add four different additives and temperature stabilizers, and leave for 4 hours.
[0041] 3) Add 0.20% cross-linking agent to the base liquid after standing for 4 hours, and then add a mixing mixer to make it cross-linked. After the center of the cross-linking liquid is slightly raised, place them in steel tanks respectively and tighten them with a wrench.
[0042] 4) Put all the fracturing fluid in the steel tank in a constant temperature water bath (oil bath) pot, and observe the changes in the readings of the microcontroller.
[0043] 5) Export the data stored in the single-chip microcomputer, such as image 3 shown.
[0044] It can be seen from the spectrum that QN-01 temperature stabilizer has better performance, and the system using this additi...
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Abstract
The invention provides an evaluation method for a system for screening a guanidine gum fracturing fluid. The method comprises the steps that temperature of water bath (or oil bath) is set, then equalamounts of different fracturing fluid systems are put into a same sealable 10MPa-pressure-resistant steel tank, the center of a steel tank is provided with a temperature-sensitive thermometer, the other end of the thermometer is connected with a single chip microcomputer used for recording and saving measured data, then the steel tank is put into the adjusted water bath (or oil bath), and the viscosity and temperature resistance of the guanidine gum fracturing fluids are compared through the change of the number of the thermometer. The evaluation method for the system for screening the guanidine gum fracturing fluid has the advantages that the viscosity and temperature resistance of different guanidine gum fracturing fluid systems can be easily and visually judged through the change of thenumerical reading of the thermometer, the method is convenient, simple and visual, the problems that the measurement cannot be carried out or the measurement is inaccurate due to the facts that the numerical reading is unstable or the viscosity is too large and the temperature is higher than 100 DEG C when a six-speed viscosity meter is used for performing measurement are solved, and compared with a rheometer, the measurement is convenient, and the measurement temperature range is wider.
Description
technical field [0001] The technical field of guar gum viscosity performance evaluation of the present invention, in particular relates to an evaluation method for screening guar gum fracturing fluid system. Background technique [0002] Fracturing is divided into water-based fracturing, oil-based fracturing, foam fracturing and other processes, among which water-based fracturing is the most widely used, accounting for about 65% of all fracturing processes, and water-based fracturing is the most widely used The thickener is guar gum. The main component of guanidine collagen powder is galactomannan, which contains a large number of cis-ortho hydroxyl groups in its molecule. When the organic boron cross-linking agent is cross-linked with guanidine gum, multi-level ionization occurs first to generate borate ions B(OH ) 4 - , and then form a stable hydrogen bond with the cis-ortho hydroxyl group in the guar gum molecule, and form a viscoelastic jelly through intermolecular cr...
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Patent Type & Authority Patents(China)
IPC IPC(8): G01N11/00
CPCG01N11/00G01N2011/0093
Inventor 谢元李轶沈燕宾王佳路建萍周渝许磊
Owner SHAANXI RES DESIGN INST OF PETROLEUM CHEM IND
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