Progress fracturing fluid

single guar gum derivatives. Content of the polymer is 1/2 of the conventional polymer fracturing fluid; and the use of a polymer crosslinking metal-based crosslinking agent to increase the viscosity; Operating temperature 93 ~ 121 ℃; viscosity limit 400mPa · s / 100s-1, so as to obtain a long and thin cracks, but unlike that obtained with a solution of boric acid based gel short thick crack. Although the viscosity of this fracturing fluid is relatively low, but it is very suitable for hanging or carrying capacity of sand content is relatively high proppant. By 400 jobs in the field, to get the ideal stitch length and more thorough cleaning flowback.
The advantages are:
(1) can cause desired fracture length;
(2) costs than the polymer-free fracturing fluid is low;
(3) than the amount of conventional cross-linked guar gum fracturing fluid less 1/2, flowback better;
Reduction (4) degradation of the polymer damage.
The disadvantage is that when the sand filling, there are still minor injuries. Although the breaker can effectively reduce the molecular weight of the polymer, thereby reducing the viscosity of the liquid, but still contain cracks weaken diversion and discharge capacity of the polymer portion.
This fracturing fluid Utah Wasatch Formation (low porosity and permeability reservoirs) in the application and achieved good results.
2, guar gum can improve the low-borate fracturing fluid production of oil and gas wells
North American oil and gas companies have to increase crude oil production by reducing the concentration of the fracturing fluid borate crosslinked. Many companies use a borate crosslinked fracturing fluid, because such a system can produce a high viscosity, healing and re-formed under shear conditions, and is inexpensive naturally occurring borate as a main component. Borate liquid shear insensitive, crosslinking is reversible. Reducing the concentration of guar gum is intended to reduce the damage to the reservoir, and after fracturing a more thorough draining create conditions. Other studies have shown that completely drain blockage and reduce proppant can create better hydraulic fracturing  conductivity and increase production. Low guar gum borate fracturing fluid is a mixture of fresh water and guar gum, and by a single buffer - the crosslinked crosslinked fluid. You can simplify the use of buffer preparation work. Because the system was reduced by 30% to 40% of the colloid, so after fracturing proppants in the reservoir, leaving only insoluble residues and less colloid. Practical application shows that in three months after fracturing , oil companies increase the net present value $ 43,000.
3, HMP-quality water-based fracturing fluid
Micro polymer services company Halliburton developed a high-quality water-based fracturing fluid (HMP), the fracturing fluid is easy to recycle and can be reused many times. HMP is based on a short chain polymer, the polymer in the manufacturing process chemically cut, the final 20 to 30 times shorter than the original polymer. Fracturing fluid borate crosslinker is added. After pumping stops, reservoir rocks in the role of natural acidity, fracturing fluid can be effectively broken plastic. Flowback can be re-used.
The company said, HMP has the following characteristics: a reusable, saving money and reducing the amount of water used to solve the water problem; the crack length increases of 3 to 5 times the rate of increase yield and total reserves equivalent; drain efficiency doubled and without the use of the breaker; enhanced ability to carry proppant fracturing fluid filtration will decrease.
Since after the fracturing gel is pumped naturally break and restore its original viscosity, and therefore, without displacing the proppant, theOil fracturing proppant can be freely discharged back the wellbore, and then recovered by filtration and re-use. HMP using treated for subsequent stimulation not only economic, but also effective. This feature makes HMP is especially suitable for remote operation.