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

Active Publication Date: 2015-06-03
JINHU KAIRUITE GASOLINEEUM ENG MATERIALS +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Usually, phosphogypsum is reused after washing, calcination, etc., but the utilization rate is very low, and other resources are wasted during the treatment process, which easily causes secondary pollution

Method used

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  • Preparation method for ardealite-based gelled slurry used for well cementation in oil and gas reservoir
  • Preparation method for ardealite-based gelled slurry used for well cementation in oil and gas reservoir
  • Preparation method for ardealite-based gelled slurry used for well cementation in oil and gas reservoir

Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention relates to a preparation method for ardealite-based gelled slurry used for well cementation in an oil and gas reservoir. The preparation method comprises the following steps: step 1, taking ardealite, carrying out drying, grinding and screening and selecting ardealite powder with a particle size in a range of 0 to 0.1 mm; step 2, uniformly mixing the ardealite powder with a composite reinforcing material and cement so as to obtain a premix; and step 3, adding water, a drag reducer and a filtrate reducer into the premix, carrying out uniform stirring and then adding an antifoaming agent so as to obtain the gelled slurry. The obtained gelled slurry is filled into a die and is placed in a water bath with a constant temperature of 50 or 80 DEG C for maintenance and molding so as to obtain a gelled material. The method provided by the invention fully utilizes ardealite and has the advantages of a simple process, low production cost and good repeatability; the prepared gelled slurry has the characteristics of zero free water, appropriate fluidity and normal densification performance; and the prepared gelled material has hyposmosis and high expansion performances in the water bath with a constant temperature of 50 or 80 DEG C and can be used as a well cementation material for the oil and gas reservoir.

Description

technical field [0001] The invention relates to a method for preparing a phosphogypsum-based gelling slurry for well cementing in oil and gas reservoirs, and belongs to the technical field of comprehensive utilization of phosphogypsum. Background technique [0002] Phosphogypsum is a by-product of phosphate fertilizer production, and its main component is calcium sulfate. In China, nearly 50 million tons of phosphogypsum are produced every year, of which only about 20% are utilized. A large amount of untreated phosphogypsum accumulates or is discharged directly, polluting land and water resources. Making full use of phosphogypsum can not only protect the environment, realize resource reuse, but also promote economic development. [0003] Usually, phosphogypsum is reused after washing, calcination, etc., but the utilization rate is very low, and other resources are wasted during the treatment process, which easily causes secondary pollution. Contents of the invention [0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/46
Inventor 华苏东刘娟诸华军姚晓何玉鑫王亚军
Owner JINHU KAIRUITE GASOLINEEUM ENG MATERIALS
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