Drag reducers for fracturing

Drag reducers for fracturing

Product Description

For the formation characteristics of unconventional oil and gas reservoirs such as low permeability, high-strength rocks, low closure stress, and well-developed natural fractures, the fluid system for fracturing with slip water has better network fracture performance than the gum system, causes less damage to the formation, and greatly improves the production enhancement effect of the fracturing fluid. Conventional drag reducers cannot meet the corresponding drag reduction requirements of the current fracturing fluid system. They have low sand-carrying capacity and high construction friction resistance, which limits their further application in oil fields. Common drag reducer systems such as plant guar gum and other microemulsions have the common characteristics of low sand-carrying capacity, high molecular weight and significant damage to the formation. Therefore, it is necessary to improve the performance of the drag reducer system by changing the structure of thickener molecules and fluid mechanics. The new polyacrylamide slippery water system features low viscosity and high elasticity. It has good sand-carrying capacity, low friction resistance and low residue. Relevant on-site construction data show that this new low-molecular-weight slippery water system outperforms the conventional fracturing fluid system in terms of drag reduction performance and sand-carrying capacity.

Technical indicators

Advantages and characteristics

Supramolecular structural fluids have inherent characteristics of salt resistance and alkali resistance.

It has a strong sand-carrying capacity (viscoelastic effect). The 0.5% concentration of the gel solution can achieve a sand ratio of 32%. After standing for 18 hours, there is slight sedimentation, while the guanidine gel settles completely after 4 hours.

The low-molecular-weight slippery water system with no residue and low damage causes less than 10% damage to the core, while that of guanidine gel is about 34%.

It has good shear dilution properties, which can significantly reduce flow resistance. The resistance reduction rate of slippery water can reach 70.6%.

· Anti-shear performance: Due to the irreversibility of the cross-linking effect of water-based cross-linked fracturing fluid, its effective viscosity is bound to continuously decrease with the increase of shear time. However, for structural fluids, since their structure reversibly changes with shear action, when the shear rate is constant, their structure will reach a state balanced with that shear rate. Then, their effective viscosity will no longer decrease with the increase of shear time and will remain constant for a long time, demonstrating excellent shear resistance

Advantages of on-site application

It has low requirements for the water quality standards of the clear water in the solution preparation and strong adaptability.

Low viscosity and high elasticity;

There are 3 to 4 types of materials. The on-site liquid preparation is simple, reducing the proportion of liquid preparation time in the construction time.

It has a fast gelation speed and good viscoelasticity during fracturing operations.

The fracturing fluid has good shear resistance, fast gel breaking after compression, and less residual impurities in the reservoir.

The compatibility of the glue solution is good and there is no wetting reversal.

It can be continuously mixed online, which is more suitable for the characteristics of large liquid volume and continuous construction in shale gas fracturing operations.

It is easy to backflow and discharge, with a continuous and stable self-injection backflow rate of 56.8%, which can save a large amount of drainage and extraction costs.

Packaging, transportation and storage

Packaging: Packed in plastic drums or iron drums, with a net weight of 200±2kg per drum.

Transportation and storage: During transportation, avoid. The product should be stored in a cool and well-ventilated place.

Shelf life: 1 year