High temperature and high salinity resistant plugging control system and plugging control method by using same

A high-temperature-resistant, systematic technology, applied in chemical instruments and methods, earth drilling, and drilling compositions, etc., can solve problems such as unsatisfactory long-term effectiveness, poor plugging strength, and particle softening, and achieve long-term validity , high compressive strength and high compressive strength

Inactive Publication Date: 2014-02-19
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the actual application in Huabei Oilfield and the results of laboratory experiments, the main problems are: (1) Microsphere particles are still polymer synthesis and manufacturing plugging regulators, and there are still long-term aging and particle softening under oil reservoir conditions As well as the characteristics of poor plugging strength, its long-term effectiveness is still not ideal
In fact, it is very difficult to do

Method used

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  • High temperature and high salinity resistant plugging control system and plugging control method by using same
  • High temperature and high salinity resistant plugging control system and plugging control method by using same
  • High temperature and high salinity resistant plugging control system and plugging control method by using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: The plugging control system forms titanium salt whiskers to realize the method of plugging control

[0034] This plugging adjustment system is composed of A and B solutions. A solution is potassium chloride and titanium trichloride, and B solution is sodium sulfide. The B and A solutions are alternately injected into the natural rock core at a pressure of 0.1MPa to 200MPa and a temperature of 30°C to 600°C. Titanium salt whiskers can be obtained at ℃: 2TiCl 3 +3K 2 CO 3 = Ti 2 CO 3 +6KCl. Formation water is sodium bicarbonate water type, so there is a large amount of HCO3 in the water - , S in solution B 2- The ions react with it to form CO 3 2- Provide CO to the system 3 2- . The purpose of KCl is to adjust the salinity of the solution and avoid dissolving underground rocks after being injected into the ground, such as Figure 1-Figure 3 shown. figure 1 The microscopic picture of the whiskers is given, and it can be seen that the microscopic cry...

Embodiment 2

[0036] Plugging adjustment effect experiments under high temperature conditions and different permeability

[0037] 1. Experimental materials

[0038] Plugging adjustment system: composed of A and B solutions, A solution is potassium chloride and titanium trichloride, B solution is sodium sulfide;

[0039] Rock cores: artificial rock cores 1, 2, 3, and 4. The physical parameters of each artificial rock core are shown in Table 1;

[0040] Table 1 Core physical parameters

[0041]

[0042] Fork 12 simulates formation water: as shown in Table 2.

[0043] Table 2 Ion concentration of simulated formation water in Cha12

[0044]

[0045] 2. Experimental method

[0046] (1) Put the artificial cores 1, 2, 3, and 4 into the core holder respectively, open the thermostat, set the temperature to 90°C, and proceed to step (2) after the temperature is stable;

[0047] (2) Set confining pressure 1MPa-20MPa, injection rate 0.025m / d-10m / d (meter / day), open the intermediate container...

Embodiment 3

[0063] Example 3: Comparative example of the plugging control system of Example 2 and the scheduling effect of the polymer gel

[0064] 1. Experimental materials and methods

[0065] Polymer gel system solution (the polymer is polyacrylamide, the concentration is 1200mg / L; the crosslinking agent is chromium ion crosslinking agent, the concentration is 60mg / L; that is, the polycross ratio is 20:1), the diameter is 2.5 inches Rock core, the physical properties of the rock core are shown in Table 5, and the formation water uses Cha 12 formation water (same as Example 2). The experimental temperature is 90°C. The injection volume is 0.5PV.

[0066] Table 5 Core physical properties

[0067]

[0068] The polymer gel system is injected into the core, and when a certain amount of the polymer gel system solution is injected, the system is sealed and kept at a constant temperature until the system is completely gelled. Follow-up water flooding was carried out, and the pressure ch...

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Abstract

The invention discloses a high temperature and high salinity resistant plugging control system and a plugging control method by using the same. The plugging control system consists of a solution A and a solution B, wherein the solution A comprises titanium ions and potassium ions, and the solution B comprises sulfur ions. The solution A and the solution B are injected into a micropore of an oil well alternately, titanium salt whiskers are formed, and plugging control is achieved. The plugging control system has the benefits that the components solution A and solution B have low viscosity, accordingly, the injectivity is ideal, equipment and process requirements are low, the formed titanium salt whiskers are single crystals with extremely high pressure resistant strength and large compressive strength, an application requirement for plugging control in a small treatment radius of an oil field can be met, influences of the reservoir temperature and reservoir water salinity are avoided, and the plugging control effect has a long available period. For the particle size of the finally added whiskers in a filling manner, the size and shape of an actual pore throat are taken as models for natural regulation of the particle size, and the problem that the particles have to be matched with the diameter of the pore throat is solved. Furthermore, the solid whiskers naturally formed in the actual pore throat based on the size and shape still have certain permeability and can plug to certain extent.

Description

technical field [0001] The invention relates to a plugging regulating system for oil production, in particular to a high temperature and high salt plugging regulating system and a plugging regulating method using the system. Background technique [0002] The heterogeneity of oil layers in Zhongyuan Oilfield is serious, and the coefficient of variation of permeability heterogeneity V k between 0.65 and 0.82. In the process of water flooding development, a large amount of injected water flows along high-permeability layers or channels, resulting in rapid water breakthrough and rapid rise of water cut in oil wells; some low-permeability layers have low water absorption and have not even started, resulting in poor overall development effect of the oilfield ideal. Improving the water absorption profile of the injection well or the fluid production profile of the oil well is an important technology and measure to further improve the vertical sweep efficiency of the oil layer and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467E21B33/13
CPCC09K8/5045C09K8/516
Inventor 李华斌刘露霍隆军郎丽媛吴忠正龚书郭程飞陈会文李飞洋朱芮
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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