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Indoor evaluation method for carbon dioxide pollution of drilling fluid

A carbon dioxide, indoor evaluation technology, applied in the preparation of test samples, measuring devices, instruments, etc., can solve the problems of not considering whether the carbon dioxide gas is all absorbed, not actually equivalent, and the effect of the pH value of the drilling fluid.

Pending Publication Date: 2022-04-19
成都汇能恒源科技有限公司
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Problems solved by technology

[0002] Current rating CO 2 The experimental device and method of polluting drilling fluid adopts the pressure perfusion method to carry out indoor CO 2 In the pollution simulation experiment, the principle of the pressure injection method is the ideal gas state equation. This method usually needs to calculate the injection pressure of carbon dioxide according to the ideal gas state equation. When the temperature is constant, the amount of the gas substance is proportional to the pressure. However, in the actual drilling process, the environment is very complicated. The intrusion of carbon dioxide will first affect the pH value of the drilling fluid, and is also affected by the pH value of the drilling fluid. Secondly, the volume of drilling fluid will expand, and the temperature will also change. It is difficult for the pressure perfusion method to accurately simulate CO 2 Invasion, in addition, the pressure perfusion method was used to carry out indoor CO 2 During the pollution simulation experiment, for the performance test of the drilling fluid in the aging tank, the liquid in the tank is usually poured out directly, and the CO in the drilling fluid is measured by titration method. 3 2- 、HCO 3 - It does not consider whether all the carbon dioxide gas poured into the kettle is absorbed, and has not carried out relevant tests, which may cause the perfusion pressure to be not actually equal to the carbon dioxide pressure calculated by the test; secondly, the perfusion of carbon dioxide gas requires Use carbon dioxide cylinders, and carbon dioxide cylinders are high-pressure containers. High-pressure perfusion of carbon dioxide is not only limited by the stock of carbon dioxide in the cylinders, but also has many potential safety hazards in the operation of high-pressure containers. Therefore, the pressure perfusion method is used for indoor CO2. 2 Pollution simulation experiments have certain limitations

Method used

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  • Indoor evaluation method for carbon dioxide pollution of drilling fluid
  • Indoor evaluation method for carbon dioxide pollution of drilling fluid
  • Indoor evaluation method for carbon dioxide pollution of drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Preparation of carbon dioxide indicator solution: add 0.1 g of bromothymol blue to 100 ml of 20% ethanol solution to prepare a carbon dioxide indicator; take 200 ml of tap water, add 2-3 g of carbon dioxide indicator to it, and then form a carbon dioxide indicator solution.

[0050] Preparation of soil slurry: Add 20 g of sodium bentonite to 400 mL of distilled water, stir at 11,000 rpm for 20 minutes at a high speed, and then hydrate in a closed state for 24 hours to form a soil slurry.

[0051] Prepare 4 parts of the above-mentioned soil slurry, which are respectively recorded as 1#, 2#, 3#, 4#; 8.0 g of the treatment agent sample for preventing the drilling fluid from being polluted by carbon dioxide is added to the 2# and 4# slurry, and the above-mentioned 1#, 2#, 3#, and 4# four slurries were stirred at high speed for 5 minutes under the high-speed mixer; prepare 4 aging kettles cleaned with distilled water, check whether the valve stem of the aging kettle is connec...

Embodiment 2

[0063] Similar to the steps in Example 1, the difference is that the soil slurry is replaced with well slurry.

[0064] Judgment on whether there is residual carbon dioxide in the aging kettle:

[0065] When opening the valve stem of the 4# slurry aging tank to communicate with the carbon dioxide indicator solution, if the gas in the tank makes the indicator solution change from blue to green or yellow, it indicates that the gas contains carbon dioxide; if it is connected, no gas overflows, or If the overflow gas does not change the color of the indicating solution, it means that no carbon dioxide gas is detected in the residual gas.

[0066] Performance test of well slurry in aging kettle:

[0067] Using No. 4 formula as the formula of treatment agent to prevent drilling fluid from being polluted by carbon dioxide, two different well muds, well mud + 2% formula, well mud + 0.25% CO were tested 2 And well mud + 0.25% CO 2 Viscosity values, AV, PV and YP of a six-speed rotat...

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Abstract

The invention discloses an indoor evaluation method for carbon dioxide pollution of drilling fluid, and belongs to the technical field of petroleum and natural gas drilling fluid engineering. The method comprises the following steps: sequentially adding newly prepared drilling fluid and dry ice into an aging kettle, and quickly tightening and sealing a tank cover of the aging kettle; and putting the aging kettle into a roller heating furnace, rolling and aging at a set temperature, taking out, cooling, and pouring out the drilling fluid for performance test. According to the method, the dry ice is used for replacing carbon dioxide gas for evaluation testing, the performance change of the drilling fluid polluted by carbon dioxide can be comprehensively and accurately simulated and measured, and a basis is provided for preventing and treating carbon dioxide pollution of the drilling fluid.

Description

technical field [0001] The invention relates to the technical field of petroleum and natural gas drilling fluid engineering, in particular to an indoor evaluation method for drilling fluid polluted by carbon dioxide. Background technique [0002] Current rating CO 2 The experimental device and method of polluting drilling fluid adopts the pressure perfusion method to carry out indoor CO 2 In the pollution simulation experiment, the principle of the pressure injection method is the ideal gas state equation. This method usually needs to calculate the injection pressure of carbon dioxide according to the ideal gas state equation. When the temperature is constant, the amount of the gas substance is proportional to the pressure. However, in the actual drilling process, the environment is very complicated. The intrusion of carbon dioxide will first affect the pH value of the drilling fluid, and is also affected by the pH value of the drilling fluid. Secondly, the volume of drill...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00G01N1/38
CPCG01N33/00G01N1/38
Inventor 石宏凌伍零零
Owner 成都汇能恒源科技有限公司
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