Two-liquid intelligent system for oil and gas wells (resistance to high temperature, high salt, high salinity) profile control, channel plugging, water plugging agent SDKX-0198 system technical manual
1. Product system research and development overview
Shandong Kexing Chemical Co., Ltd. joint project According to the needs of tertiary oil recovery in the oilfield, the group aims at the mid- and late water plugging and channeling plugging of the oilfield compound active agent profile, the channel plugging layer after multiple steam flooding of heavy oil, and the similar problems in foam gas flooding such as carbon dioxide. Developed a new dual-liquid profile control and water shutoff product SDKX-0198 for oil and gas wells (hereinafter referred to as SDKX-0198), and successfully explored a non-toxic material based on "inorganic compound-titanyl oxalate, composite whisker precursor". A matching process system and method for microporous control and flooding in homogeneous oil reservoirs. The SDKX-0198 system is composed of two groups of liquid systems, referred to as SDKX-0198-A and SDKX-0198-B systems. The products are packaged in two liquids at the factory.
1. SDKX-0198 system introduction: in the
system; SDKX-0198-A agent: colorless and transparent liquid; the main components are nitrogen-containing inorganic compound titanyl oxalate, etc., emulsifying active agent, and deionized water as the main components Composition of transparent aqueous solution;

2. SDKX-0198-B agent: It is a colorless or light milky white aqueous solution, the main ingredients are two kinds of inorganic ammonium salts, emulsifying active agent, and deionized water. Among them, the active agent only occupies 5 thousandths of the volume in the whole,

 2. SDKX-0198 product physical and chemical indicators

 








3. The purpose and recommended range of use of the
SDKX-0198 system . 1. The SDKX-0198 system can be widely used in tertiary oil recovery, profile control and water plugging, micro-fracture plugging in chemical flooding, and three-high plugging after heavy oil multi-wheel flooding. Channeling, flowable heavy oil three high and low permeability oilfield profile control and water shutoff. Particularly suitable for horizontal wells to block water, oil-water wells, gas wells and conventional measures.
2.SDKX-0198 system injection process; A are diluted Slug - "replace Water -" agent B - "On Note water injection well (oil well pumping placed three days apart)
3. The use SDKX-blocking system 0198 large Cracks and fracturing are not closed large fractures. Three-slug plugs can be used for large channeling of oil and gas wells; pre-slugs (inject pre-crosslinked soft and hard large particles first, pay attention to the recommended pressure rise by 0.8-1.5Mpa. Inject A and B slugs)-"SDKX-0198 system A, liquid slug-"Replacement fluid-"B, liquid slug -" sealing material slug
4. SDKX-0198 system working fluid configuration and injection method
When designing and using A and B agents (the mass ratio of solid content to total solute is 1; 1), the conventional commodity concentration is injected according to the ratio of 1:1 volume in cubic number. When the total square number is designed according to the field effect, component A can be based on It needs to be diluted with water to 1:1-1:5 and the total solute remains unchanged. The B agent does not need to be diluted. The volume of the A:B agent is according to the design requirements and the solid content of the AB agent is the same, so that the volume injection volume meets the target layer effect requirements. Before injection, note that A and B must be stored separately. Both are transparent liquid substances. Under normal temperature and pressure, mixing component A and component B will produce a white precipitate.
5. The mechanism of the SDKX-0198 system;
1. The principle of the SDKX-0198 combination system for blocking water:
In the micropores under certain pressure and temperature, the reaction of SDKX-0198-A and SDKX-0198-B system is different from the reaction without "seed" or "mode" under normal temperature and pressure. SDKX-0198-A is slowly injected into the micropores to form a "nitrogen-phosphorus compound-titanium oxalate composite whisker precursor". Under the conditions of 40℃-270℃ and pressure greater than 1 atmosphere, they will further react to The mesh body in the microporous cavity is "mold" and "seed" gradually forming a whisker-like solid overall mesh material. Because the whiskers are single crystals, their compressive strength is high, and the test data is greater than 20Ma.s enough to withstand water injection pressure .
2. System characteristics:
In the micropores of heterogeneous reservoirs, due to the difference in permeability, when the component SDKX-0198A is added, it will enter the micropores with high permeability, and then use water to drive away the excess and remaining in the channel If there is no solid blockage in the micropores, then the component SDKX-0198-B is slowly injected. During this process, the components A and B in the high permeability micropores meet slowly The formation of solid precursors provides sufficient time for the operation of profile control and water shutoff pressure. With the action of pressure and formation temperature, the solid precursors are transformed into barium potassium-sulfur titanium composite whiskers, and the water plugging and profile control are completed naturally. The advantages of this method are: 1. The final water shutoff agent is an inorganic whisker material, the whisker is a single crystal, and has high compressive strength; 2. A SDKX-0198A-SDKX-0198B that adapts to the target micropore size and adjusts the particle size naturally The reactants of the system are liquid, not pre-prepared solid particles, and the final filling particle size is based on the target pore size. It is a method to adjust the particle size to adapt to the target micropore size. 3. Because the solid precursor is transformed into In the end, a certain temperature, pressure and time are required for water plugging and profile adjustment of whiskers, which provides an operational time for the growth and adjustment of whiskers.
6. Indoor evaluation of
SDKX-0198 Before application of SDKX-0198, indoor evaluation is required. When selecting site water, first dilute 100ml of agent A with 1:2 or 1; 3 (agent A dilution, lower limit 1:1, upper limit 1:5) Conduct core test or sand-packing pipe displacement pressure test with 100ml of B liquid. After the compatibility test reaches the standard, you can enter the site.
7. Product safety
The main components of A are: inorganic salt, deionized water, neutral in acidity and alkalinity, non-toxic and harmless, without flammable, explosive and environmental pollution components.
The main ingredients of B are: inorganic ammonium salt, deionized water, slightly alkaline, non-toxic and harmless, no flammable, explosive and environmental pollution ingredients, and even purchase food-grade raw materials. 8. Precautions for use
A and B cannot be mixed before construction at the same time. They are materials with opposite charge properties and cannot be confused. Agent A can be diluted or undiluted when used; Agent B cannot be diluted on-site, otherwise it will become a white liquid and cause misunderstanding. If you want to dilute and keep it transparent, you can only use the equipment before leaving the factory. Please do not need to perform B Product properties are diluted. ,
Nine, packaging and storage;
1.SDKX-0198 products for environmentally friendly products. Non-flammable products.
2. Packaging; method: 1000kg square polyester plastic drum; or 240kg; 200kg; 50kg; blue polyester plastic drum;  
3. Store indoors to prevent exposure to sunlight. When the operator touches the skin and eyes, clean it with pure water. Or wash with detergent.