Development of ultra-low temperature (0-30 DEG C) fracturing fluid system
An ultra-low temperature, fracturing fluid thickener technology, applied in the field of fracturing fluid, can solve the problems of long flowback time, large formation damage, and long gel breaking time, and achieve high flowback rate, fast dissolution speed, and gel breaking full effect
Inactive Publication Date: 2013-05-01
NANTONG KEYI CHEM
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Problems solved by technology
[0004] For ultra-low temperature (0-30°C) oil and gas well fracturing fluid systems, if conventional fracturing fluid gel breaking technology is used, there will be long gel breaking time, incomplete gel breaking, long flowback time, and formation damage caused by incomplete flowback Larger issues
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0014] Weigh 0.8g (0.4% dosage) of ultra-low temperature fracturing thickener, dissolve it in 200ml of water, add 0.8g (0.4% dosage) of main breaker and 0.4g (0.2% dosage) of auxiliary breaker at the same time, stir at room temperature Dissolve for 1 hour; prepare a cross-linking agent solution (the effective concentration of the cross-linking agent is 8%); add 1.2ml of the cross-linking agent solution to the above thickener solution to form a jelly with good elasticity, and then gradually break the gel into water at room temperature .
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The invention relates to an ultra-low temperature (0-30 DEG C) fracturing system which is used for yield increase and modification of shallow gas fields. According to the invention, a fracturing fluid comprises the following main components: 0.3-0.4 percent of ultra-low temperature fracturing fluid thickening agent, 0.4-0.6 percent of cross-linking agent, 0.2-0.4 percent of main gel breaker, 0.1-0.2 percent of auxiliary gel breaker, and the balance of water. The ultra-low temperature fracturing fluid system has the main characteristics of wide application range (beyond the range of 0-30 DEG C), high dissolving speed, capability of solution under the temperature of 0-30 DEG C within 60 min, good gel elasticity, convenience in sand carrying, complete gel breaking, high flowback rate and no environment harm.
Description
technical field [0001] The invention relates to a fracturing fluid used in the field of oil recovery in an oil field, in particular to a fracturing working fluid used in ultra-low temperature (0-30°C) reservoir fracturing. Background technique [0002] At present, fracturing plays an important role in the production and injection of oil and gas wells, the reconstruction of old wells and the improvement of ultimate oil recovery in the process of oil and gas production. During the fracturing process, timely and thorough flowback of the fracturing fluid is a key link that determines the success of the fracturing. [0003] Some oil reservoirs in China have complicated conditions, and there are some shallow oil and gas reservoirs, such as Baiyinchagan in Inner Mongolia and Yongli in Ningxia. Due to the unfavorable factors such as shallow burial and low temperature, the fracturing technology of these oil and gas reservoirs is relatively difficult. After fracturing, the effect of ...
Claims
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IPC IPC(8): C09K8/68
Inventor 穆巍唐富刚郝春玲
Owner NANTONG KEYI CHEM
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