Sandstone matrix acidizing - an important oil-producing proppant technology

Sandstone described herein derived from classification geologic means of rock with a high quartz content. In addition to a clear quartz components, also contain other resin coated sand proppant minerals such as aluminosilicates, metal oxides, sulfur, chlorides, carbonates and amorphous silicate minerals, which is deposited in the original sediments mineral called debris. Most mineral water sensitive. When the fluid through the rock matrix, traction can transport these minerals, clogged pore throat.
Sandstone connate water contains many soluble natural mineral, which is due to the equilibrium resin coated ceramic proppant and partial pressure of dissolved gases (such as carbon dioxide) and the presence of other ions. As the fluid output, the pressure drop associated to break this balance and formation of normal saline ion content, and may block the formation of precipitation pore throat. This diagenesis produce it authigenic mineral species (such as calcium carbonate, and clay materials such as zeolite, illite, kaolinite and montmorillonite).
Many job well can lead to geological damage, for example, drilling and completion fluids often leak into the sandstone. Drilling and completion of the filtrate invasion can produce a completely different chemical environment, environmental acidification is carried out. Other formation damage can produce perforating, gravel packing, normal production and water injection job. Many pollutants and acid dissolution most mineral formations. Understand the chemical reaction of acid rock reaction is to choose the basis proppant type and proppant concentration.

Influence the formation of acid should also affect the production of oil proppant

In the production process of oil proppants, in sandstone acidizing, the formation fluid and mineral compatibility is very important. Therefore, to determine the potential of acid precipitation mixture of soil minerals and connate water needs careful examination. The product does not have to be dissolved in the acid reaction of residual acid solution or some ionic environment.
The following describes the response to acid formation
Even if the contamination is determined, the situation unworthy team may also occur. A good hsp proppant the fluid system is feasible, the response may determine formation fluids and mineral acid and residual acid. These are not compatible and can lead to cavities solid precipitate, can clog pores, offsetting improvements acid formation. Acidification results may never be completely removed injury impact and there is no harm to the greatest improvement in the formation of acid produced by precipitation or blockage formation.
When can conduct a detailed petrographic analysis of core, geochemical simulation can be used to estimate potential problems. This simulation requires a detailed definition of the chemical characteristics of the construction of the fluid, mineral and matrix formation pollution characteristics. Particle release and finer residual contamination is still possible formation of acid precipitation, which is inconsistent with the core test results.
When we proppant conductivity production of oil, we must pay more attention to the impact on the formation of acid to achieve higher yields.

Application Status oil fracturing proppant

Understood fracturing technology is an important means of transformation of oil and gas fields, it is the use of artificial methods to fluid injection rock grassroots pressure to exceed the formation fracture strength, so that cracks around the wellbore rock formation A high-flow capacity of the channel has. In order to maintain the open crack formation after natural gas fracturing oil and gas product can be smoothly through the injection of particulate proppant is one of the important measures.
Fracturing technology for worldwide oil production plays a very important role, and oil is a key oil fracturing proppant fracturing technology can be successful. Quality proppant can play an important role for the extraction of crude oil. Oil fracturing proppant, is to keep the deep fissure formation rock split state support, particle size 0.4-0.9 mm, there is a certain roundness and sphericity. During use, the proppantfracturing sand fluid mixing, the use of coercion injected deep cracks in the rock strata support in order to improve the rate of oil derivative, increase oil production.
The commonly used quartz sand proppant, and a variety of resin coated ceramic composite particles. Which quartz sand cheapest price, relatively low density, to facilitate the construction of pumping, so it is widely used. However, the low intensity of quartz sand, the ball is poor, thereby reducing fracture conductivity, especially not apply to closed high pressure deep. Quartz sand coated with a resin composite particles, the sphericity improved corrosion resistance can be achieved a higher index, even if the internal quartz sand are crushed, the outside may be coated with a resin layer wrapped pieces, holding diversion cracks capacity, is a law of the development direction of fracturing support agent, but the current product shelf life is relatively short, the cost is also high. With a variety of different materials and manufacturing process of ceramic, quartz sand relative density is slightly higher than for the fracturing proppants fluid pumping conditions and are demanding higher performance, increased the difficulty of hydraulic fracturing time, but ceramic ball and roundness of quartz sand than good, can reach more than 0.9, especially corrosion resistance, temperature resistance and compressive strength are higher than the quartz sand, so the fracture conductivity decline rate is much lower. Now has more and more widely used oil and gas fields.