Method for testing water content of crude oil

A technology of water content and crude oil, applied in the direction of material inspection products, etc., can solve the problems of low oil-water density, poor centrifugal separation effect, and low accuracy of crude oil water content.

Active Publication Date: 2015-04-08
PETROCHINA CO LTD
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Problems solved by technology

[0003] However, the existing centrifugation method is only suitable for measuring the water content of ordinary crude oil. For heavy oil and crude oil produced by tertiary oil recovery, these crude oils have high viscosity, high waxy and colloid content, and small oil-water density difference. The separation effect is poor, the accuracy of the measured water content of crude oil is low, and the measurement time is long

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  • Method for testing water content of crude oil
  • Method for testing water content of crude oil
  • Method for testing water content of crude oil

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Embodiment 1

[0028] This embodiment provides a method for measuring the water content of crude oil, such as figure 1 As shown, the method mainly includes the following steps:

[0029] Step 110, configure the solution with distilled water not less than 1.40g / cm 3 brine solution, and preheat the brine solution to 30-60°C.

[0030] In this step, the brine solution can be configured through the calcium chloride, sodium formate, potassium formate, and cesium formate; the solubility of the calcium chloride, sodium formate, potassium formate, and cesium formate is not less than 0.4; in the brine solution, at least Including one of the calcium chloride, the sodium formate, the potassium formate, and the cesium formate.

[0031] Step 111, preheating the sample of crude oil to 30-60°C.

[0032] Step 112, mixing 10ml of the brine solution and 90ml of the crude oil sample, and stirring at a speed of 400-800 rpm for 10 minutes to obtain a mixture of the crude oil sample.

[0033] Step 113, put 20ml...

Embodiment 2

[0045] In practical application, in order to compare the measurement results of the water content of crude oil, the centrifugation method (for the specific method, refer to GB / T 6533 for the determination of water and sediment in crude oil), the distillation method (for the specific method, see GB260 for the determination of moisture content in petroleum products), and The method provided by the invention measures the moisture content of a crude oil in a combined station, and the experimental results are shown in Table 1. The operation steps of this embodiment include:

[0046](1) Prepare 75% potassium formate solution with distilled water and heat it to 40°C for later use.

[0047] (2) Measure 90mL of the oil sample preheated to 40°C, mix it with 10mL of the brine solution in step (1), stir for 10min, and the stirring speed is 400 rpm;

[0048] (3) Take two 20mL mixed oil samples prepared in step (2) and pour them into the first centrifuge tube and the second centrifuge tube...

Embodiment 3

[0054] Crude oil exported from a joint station is heavy oil with a high freezing point and contains colloids and asphaltenes. In order to compare the measurement results of the water content of crude oil, the present embodiment adopts the centrifugation method (see GB / T 6533 for specific methods), the distillation method (see GB 260 for specific methods), and the method provided by the present invention to measure the water content of crude oil in a joint station two The experimental results are shown in Table 2. in,

[0055] The operation steps of this embodiment include:

[0056] (1) prepare 46% calcium chloride solution with distilled water for subsequent use, and be heated to 50 ℃ for subsequent use;

[0057] (2) Measure 90 mL of the oil sample preheated to 50°C, mix it with 10 mL of the saline solution in step (1), stir for 10 min, and the stirring speed is 600 rpm;

[0058] (3) Take two 20mL mixed sample oils configured in step (2) respectively, pour them into the fir...

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Abstract

The invention provides a method for testing the water content of crude oil. The method comprises the following steps: preparing a saline solution of which the solution density is no less than 1.40g / cm<3> by using distilled water, and pre-heating the saline solution to be 30-60 DEG C; preheating a crude oil sample to be 30-60 DEG C; mixing 10ml of the saline solution and 90ml of the crude oil sample, and stirring for 10 minutes at the rotation speed of 400-800rpm, thereby acquiring a mixture of the crude oil sample; loading 20ml of the mixture into a centrifuge tube, putting the centrifuge tube into a centrifuge, and rotating the centrifuge for 15 minutes at a rotation speed of 2000-4000rpm; and reading the volume V of the water inside the centrifuge tube, and calculating the water content of the crude oil according to an equation (V / 20)*100%-10%. Therefore, the water content of crude oil which is large in velocity and relatively high in wax and colloid can be rapidly and precisely tested.

Description

technical field [0001] The invention belongs to the technical field of oilfield development, in particular to a method for measuring the water content of crude oil. Background technique [0002] At present, distillation and centrifugation are mainly used to measure the water content of crude oil in oil fields. The distillation method is relatively accurate but the detection speed is slow and requires the use of organic solvents, which generally pollute the environment and have a serious impact on the health of operators. Compared with the distillation method, the centrifugation method has the characteristics of simple operation and faster speed, so the centrifugal method is generally used to determine the water content of crude oil in mining area assays. [0003] However, the existing centrifugation method is only suitable for measuring the water content of ordinary crude oil. For heavy oil and crude oil produced by tertiary oil recovery, these crude oils have high viscosit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/28
Inventor 程静葛红江雷齐玲杨卫华雷齐松
Owner PETROCHINA CO LTD
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