Performance of ultra-low molecular slickwater syst
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Performance of ultra...>
As for the unconventional oil and gas reservoirs with low permeability, high strength rock, low closure stress and natural fracture formation, slickwater fracturing fluid system has better network crack performance than guar gum system and the formation damage is low.
1. Background Introduction
As for the unconventional oil and gas reservoirs with low permeability, high strength rock, low closure stress and natural fracture formation, slickwater fracturing fluid system has better network crack performance than guar gum system and the formation damage is low, which greatly improves the yield of fracturing fluid. Conventional drag reducing agent is not able to meet the requirements of reducing resistance of fracturing fluid system at present stage, also with low sand carrying capacity, high construction friction, which limits its further application in oil field. The commonly used DRA system such as plant guar gum and other micro emulsion, their common features are the low carrying capacity, high molecular weight and greater damage to the formation, so we must improve the structure and fluid mechanics of DRA system structure for thickening agent molecules. The characteristics of new polyacrlamide slickwater system has low viscosity, high elasticity, good carrying capacity, low friction, low residue, and some on-site construction related data showed that this new low molecular slickwater system were higher than that of conventional fracturing fluid system in drag reduction performance and sand carrying ability etc..
2. Experimental performance evaluation
2.1 Sand carrying ability
The hanging ball time at different temperatures is shown in the following table. The results show that the new low molecular slickwater system has good sand carrying capability.
Time for falling ball/s
Time for falling
2.2 Flexibility test
From the above picture, we found that low molecular slickwater system modulus is higher than the storage modulus, the material showed good elasticity, we found that when the frequency is greater than 0.215Hz, the storage modulus was larger than the loss modulus, slickwater showed a strong elasticity.
2.3 Gel breaking performance and residue test
Chose specific breaking agent, new low molecular slickwater system can completely break, in accordance with the standard SY/T107-2005 test system, doing the slickwater gel breaking performance and residue test, fully demonstrated its excellent performance. As shown in the following figure;
Content of gel breaker，%
5min 10min 15min
2.0 1.5 <1
1.8 1.2 <1
3. Basic performance advantages
(1) Supramolecular structural fluid has inherent characteristics of salt resistant, alkali resistant;
(2) The sand carrying capacity is strong (visco elastic effect), the 0.5% concentration of the liquid can reach 32% of the sand ratio, a slight settlement after 18 hours after and 4 hours for gum gel;
(3) No residue, low damage, low molecular slickwater system on core damage below 10%, while the guar gum is about 34%;
(4) The shear thinning is good, this feature can greatly reduce the flow resistance, slickwater resistance reduction rate is about 70.6%;
(5) Exhibit excellent shear characteristics.
4. Field performance advantages
(1) Stable performance, long preservation time (up to 45 days);
(2) The water quality standard of the water distribution is low, and the adaptability is strong;
(3) Low viscosity and high elasticity;
(4) The type of material is 3-4, the site of the liquid is simple, reducing the proportion of the time andt he construction time;
(5) The rubber speed is fast, and the fracturing operation has good viscoelasticity;
(6) The fracturing fluid has good shearing resistance, high pressure after fracturing, and less residual;
(7) The properties of the gel are good, and there is no wetting reversal;
(8) Easy flowback, continuous and stable flowing flowback rate of 56.8%, save a lot of production cost;
5. Main performance parameters
Apparent dynamic viscosity，mpa.s
Surface tension, mN/m
Interfacial tension mN/m
Swelling volume，sodium soil，ml
Swelling volume，calcium soil，ml
Drag reduction rate，%
No precipitation, flocculation or delamination
LEAD OILFIELD SOLUTIONS COMPANY is a professional manufacturer and supplier of Sodium Polyacrylate, Corrosion inhibitor, Demulsifierin China. We offer stimulation service and chemicals, acid fracturing engineering. We produce such as clay inhibitor, encapsulated gel breaker, defoameretc. Please visit the company's website at www.sloilfield.com. Connect with L.E.A.D. onGoogle+, and LinkedIn.