High-temperature-resistant salt-resistant oil-well cement water-loss control agent and preparation method thereof
A technology of oil well cement and water loss reducing agent, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem that water loss is difficult to control within the ideal range, achieve good control of water loss, and have a wide range of applications Effect
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[0016] The preparation method of high temperature and salt resistant oil well cement fluid loss reducing agent of the present invention, described synthetic method comprises:
[0017] a) Prepare raw material aqueous solution, described raw material aqueous solution comprises four kinds of monomers: 2-acrylamido-2-methylpropanesulfonic acid (AMPS), N,N'-dimethylacrylamide (DMAA), styrene ( SM), fumaric acid (FA), wherein the parts by weight of the four monomers are: 45-70 parts of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), N,N'-dimethyl 10-25 parts of acrylamide (DMAA), 10-30 parts of styrene (SM), 5-10 parts of fumaric acid (FA).
[0018] b) reacting the raw material aqueous solution by adjusting the solution polymerization conditions such as the concentration of the solution, the pH value of the solution, the reaction temperature, the dosage of the initiator, and the reaction time.
[0019] c) The initiator is ammonium persulfate and sodium bisulfite (mass ratio 1:1)....
Embodiment 1
[0023] In parts by weight, weigh 41.45 parts of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 7.93 parts of N,N'-dimethylacrylamide (DMAA), and 8.33 parts of styrene (SM) , 4.64 parts of fumaric acid (FA). Dissolve in 145 parts of deionized water, add an appropriate amount of sodium hydroxide solution, and adjust the pH value to 7. Add the solution into the three-necked flask, put the three-necked flask into a constant temperature water bath at 60°C, start stirring, and pass nitrogen gas into the three-necked flask to remove oxygen. After the temperature of the aqueous solution in the three-necked flask reaches 60°C, add 9.35 parts of The mass concentration of ammonium sulfate and sodium bisulfite is a mixed solution of 10% to initiate the reaction, and the reaction lasts for 6 hours to make a light yellow tetrapolymer viscous solution. Code-named as sample 1.
[0024] Such as figure 1 Shown, the infrared spectrogram of the polymer of the present invention. 2923cm -1 ...
Embodiment 2
[0026] Evaluation of the fluid loss reducing performance of the oil well cement fluid loss reducing agent of the present invention
[0027] Add a certain mass percentage (based on cement mass) of sample 1 to Jiajiang oil well cement, prepare cement slurry with a water-cement ratio of 0.44 according to the GB10238-2005 standard, and then press the People's Republic of China Petroleum and Natural Gas Industry Standard SY / T5504.2 -2005 "Evaluation Method of Oil Well Cement Fluid Loss Reducer" measures the water loss of sample 1, and evaluates the water loss reducer performance of sample 1.
[0028] The water loss reduction effect of sample 1 on oil well cement was evaluated according to the above method, and the results are shown in Table 1. Experimental results show that the fluid loss reducing agent for oil well cement of the present invention not only has good fluid loss reducing performance in fresh water solutions within the range of 40°C to 200°C, but also has good performa...
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