Preparation method for ardealite-based gelled slurry used for well cementation in oil and gas reservoir
A technology for phosphogypsum and oil and gas reservoirs, which is applied to chemical instruments and methods, drilling compositions, etc., can solve the problems of low utilization rate, secondary pollution, waste of other resources, etc., and achieves low production cost, good repeatability, The effect of suitable flow
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Embodiment 1
[0026] The preparation method of phosphogypsum-based cementitious slurry for well cementing of oil and gas reservoirs in this embodiment comprises the following steps:
[0027] The first step is to take phosphogypsum, after drying (drying temperature is 45°C±3°C), grinding, and sieving, take phosphogypsum powder with a particle size of 0-0.1mm;
[0028] The second step is to mix phosphogypsum powder with composite reinforcing material and cement at a weight ratio of 5:3:2 to obtain a premix; the composite reinforcing material is composed of the following components in weight ratio:
[0029] CaO
SiO 2
al 2 o 3
P 2 o 5
R 2 o
TiO 2
MgO
26.67%
39.95%
16.85%
0.03%
8.38%
0.94%
7.18%
[0030] Wherein, R is an alkali metal (preferably lithium, sodium, or potassium).
[0031] Step 3: Add water, drag reducer (preferably USZ) and fluid loss control agent (preferably BXF-200L) to the premix. The weight r...
Embodiment 2
[0045] The basic steps of the preparation method of the phosphogypsum-based cementitious slurry for well cementing in oil and gas reservoirs in this example are the same as those in Example 1, except that:
[0046] (1) In the second step, the composite reinforcement is composed of the following components by weight ratio:
[0047] CaO
SiO 2
al 2 o 3
P 2 o 5
R 2 o
TiO 2
MgO
25.57%
45.50%
14.60%
0.06%
7%
0.93%
6.34%
[0048] Wherein, R is an alkali metal (preferably lithium, sodium, potassium).
[0049] (2) In the third step, the weight ratio of premix, water, drag reducer and fluid loss reducer is 1:0.44:0.004:0.01.
[0050] The performances of the gelled slurry made by the present embodiment are shown in the following tables:
[0051] (1) Basic performance:
[0052]
[0053] (2) Thickening performance
[0054]
[0055] In this embodiment, the gelled slurry has zero water separation, ...
Embodiment 3
[0063] The basic steps of the preparation method of the phosphogypsum-based cementitious slurry for well cementing in oil and gas reservoirs in this example are the same as those in Example 1, except that:
[0064] (1) In the second step, the composite reinforcement is composed of the following components by weight ratio:
[0065] CaO
SiO 2
Al 2 o 3
P 2 o 5
R 2 o
TiO 2
MgO
20.55%
51.40%
13.37%
0.08%
8.35%
0.72%
5.53%
[0066] Wherein, R is an alkali metal (preferably lithium, sodium, potassium).
[0067] (2) In the third step, the weight ratio of premix, water, drag reducer and fluid loss reducer is 1:0.44:0.006:0.01.
[0068] The performances of the gelled slurry made by the present embodiment are shown in the following tables:
[0069] (1) Basic performance:
[0070]
[0071] (2) Thickening performance
[0072]
[0073] In this embodiment, the gelled slurry has zero water separatio...
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