Thermo-sensitive sand consolidation, channeling sealing and well completion integrated chemical system used for steam injection for thermal recovery

A temperature-sensitive, steam-injecting technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of cumbersome construction process, loss of consolidation effect, difficulty in producing heavy oil in oilfields, etc.

A temperature-sensitive, steam-injecting technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of cumbersome construction process, loss of consolidation effect, difficulty in producing heavy oil in oilfields, etc.

CN103184044AActive Publication Date: 2013-07-03CHINA PETROLEUM & CHEM CORP +1
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  • Thermo-sensitive sand consolidation, channeling sealing and well completion integrated chemical system used for steam injection for thermal recovery
  • Thermo-sensitive sand consolidation, channeling sealing and well completion integrated chemical system used for steam injection for thermal recovery
  • Thermo-sensitive sand consolidation, channeling sealing and well completion integrated chemical system used for steam injection for thermal recovery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～16

[0031] Embodiment 1~16, chemical system formula orthogonal experiment

[0032]The influence of each factor on the performance of the chemical system at high temperature was comprehensively investigated by using 5 factors and 4 levels of orthogonal experiment. In the experiment, furfuryl alcohol prepolymer products with different viscosities were used (named F1, F2, F3, and F4, and their viscosities were 77mPa s, 64mPa s, 56mPa s, 49mPa s respectively), and B was temperature selective curing. agent (taking carbon tetrachloride as an example, the selective curing temperature is 120°C, and the dosage is 6, 7, 8, 9% of the weight of the furfuryl alcohol prepolymer; C is pyridine, and the dosage is 0, 1% of the weight of the furfuryl alcohol prepolymer , 3, 5%; D is butyl acetate, the dosage is 0, 3, 6, 9% of the weight of furfuryl alcohol prepolymer; E is resorcinol, the dosage is 0, 0.2, 0.4, 0.6%; Carry out 16 formula orthogonal experiments altogether, investigate the influence...

Embodiment 17

[0033] Embodiment 17, thermal stability test

[0034] Put the colloids of the CP-1 system consolidated at 120°C, 150°C and 180°C respectively in a high-temperature furnace at 300°C for 24 hours, take them out regularly to cool to room temperature, measure the strength of the colloid, and investigate its thermal stability sex, the experimental results see figure 1 .

[0035] Depend on figure 1 The experimental results show that the colloids of the CP-1 system consolidated at 120°C, 150°C and 180°C have little change in the strength of the colloid after thermal aging at 300°C for 24 hours. The colloids consolidated under the conditions of ℃, 150℃ and 180℃ all have good heat resistance.

example 18

[0036] Example 18. Relationship between consolidation strength and expansion volume at different consolidation temperatures

[0037] Calculate the expansion volume multiple of 20mL of the chemical system with the mass fraction of curing agent 5% and 9% after being solidified at different temperatures. The calculation method is as follows: calculate the volume of the raw solidified body under the above-mentioned different temperatures through the diameter of the Teflon cylinder and the height of the raw solidified body, and divide the calculated volume of the colloid by the volume (20mL) of the chemical system stock solution to get The expansion volume multiple after consolidation at different temperatures, the relationship between consolidation temperature and expansion volume is shown in figure 2 shown.

[0038] Such as figure 2 As shown, with the increase of the mass fraction of the curing agent in the chemical system, the volume expansion multiple of the consolidated bo...

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Abstract

The invention relates to a thermo-sensitive sand consolidation, channeling sealing and well completion integrated chemical system used for steam injection for thermal recovery. The chemical system is characterized in that it includes a low viscosity furfuryl alcohol prepolymer, a temperature selective curing agent, and resorcinol. The chemical system is chemically stable under oil reservoir temperature and wellbore temperature conditions. Thermal initiation after steam injection can be utilized to form high strength foam resin with cured resin as a continuous phase and gas as a dispersion phase, and a resin film is formed on a stratum sand surface. The stratum sand is cemented through a hydrogen bond, thus consolidating the stratum sand and plugging large channels. A single-fluid technique can be adopted for construction in a thermal recovery development process, and integration of sand consolidation and channeling sealing can be realized.

Description

technical field [0001] The invention relates to a chemical system for chemical sand cementing completion, chemical sand control and water sealing of oil and gas wells in the development of oil and gas fields, belonging to the field of oil reservoir exploitation. technical background [0002] Injecting high-temperature steam is one of the most effective methods to improve the production effect of heavy oil reservoirs. However, the erosion and thermal expansion of high-temperature steam damage the formation consolidation of heavy oil reservoirs, and sand particles are exported with oil flow, seriously affecting normal production. And with multiple rounds of huff and puff development, the problem of steam channeling has become more and more prominent, resulting in low thermal efficiency of steam, serious waste of energy consumption, and low recovery of heavy oil. very important. Among them, chemical sand consolidation is a kind of sand control completion method, which uses che...

Claims

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Application Information

Patent Timeline
03 Jul 2013
Publication
CN103184044A
IPC
C09K8/592
Inventors
段友智; 丁士东