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Application of welan gum for increasing recovery ratio in ultrahigh temperature oil reservoir oil displacement

A high-temperature oil and recovery technology, applied in the fields of biotechnology and energy exploitation, can solve the problems of low conversion rate of welan gum, lack of systematic science in the use of oil-displacing agent, high cost, and achieve the effect of excellent rheological properties

Active Publication Date: 2017-03-22
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Domestic Shandong University, Nanjing University of Technology and Nanchang University have successively reported the rheological properties, fermentation conditions and application of Welan gum in food additives, oil drilling and cement building materials. Modified viscosity-increasing patented technology, but there is no report on its application as an oil displacement agent in high-temperature reservoirs to enhance oil recovery
There are two main reasons, one is that the low conversion rate of Welan gum makes it too expensive as an oil displacement agent, and the other is the lack of systematic and scientific research on its use as an oil displacement agent

Method used

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  • Application of welan gum for increasing recovery ratio in ultrahigh temperature oil reservoir oil displacement
  • Application of welan gum for increasing recovery ratio in ultrahigh temperature oil reservoir oil displacement
  • Application of welan gum for increasing recovery ratio in ultrahigh temperature oil reservoir oil displacement

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Experimental program
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Effect test

Embodiment 1

[0041] The physical model oil displacement experiment of Welan gum provided by the present invention (see the summary of the invention for details).

[0042] The pore volume, porosity, permeability, original oil content and original oil saturation of each core in the experiment are shown in Table 1, where 1-x, 2-x, 3-x, etc. are the experimental groups, and x is the number of cores in parallel experiments.

[0043] Table 1 Basic parameters of experiment

[0044]

[0045] Table 2 Injection system and injection method

[0046] Core serial number temperature Welan Gum Concentration injection method injection volume 1-1 60℃ 0％ continuous injection 2PV 1-2 60℃ 0.2％ continuous injection 2PV 1-3 60℃ 0.3％ continuous injection 2PV 2-1 90℃ 0％ continuous injection 2PV 2-2 90℃ 0.2％ continuous injection 2PV 2-3 90℃ 0.3％ continuous injection 2PV 3-1 120℃ 0％ continuous injection 2PV ...

Embodiment 2

[0054] The viscosity-temperature characteristic of Welan gum provided by the present invention.

[0055] Prepare Welan gum aqueous solutions with concentrations of 0.2%, 0.4%, 0.6%, 0.8%, and 1.0%, respectively, and measure the viscosity of the solution with a DVLV-II rotary viscometer in the range of 20 to 120°C and at a constant speed of 60r / min. apparent viscosity ( figure 1 ). The viscosity of Welan gum solution with different concentrations changes very little at different temperatures, indicating that the Welan gum aqueous solution has good thermal stability, and its solution viscosity is basically not affected by temperature changes within the range of 20-120 °C.

Embodiment 3

[0057] The temperature-resistant property of the welan gum provided by the invention.

[0058] Preparation concentration is the aqueous solution of 0.3% Welan gum, adds 23 sodium chloride, uses Fann 50SL high temperature and high pressure rheometer, measures pressure 756PST, under the temperature 138 ℃, when rotating speed is 60RPM, the change of the rheological properties of Welan gum ( figure 2 ). Although the viscosity of 1% Welan gum salt solution decreased, the final viscosity remained at 130mPa·s, which indicated that Welan gum could still maintain good rheological properties under high temperature and high pressure. In this experiment, the rheological change of 1% xanthan gum salt solution was measured with the same method. It can be seen that under the same conditions, the viscosity of xanthan gum salt solution is significantly lower than that of Welan gum. The viscosity of the solution drops significantly after 20-35 minutes of treatment, which shows that the rheolo...

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Abstract

The invention provides the application of welan gum for increasing the recovery ratio in ultrahigh temperature oil reservoir oil displacement. The application comprises the steps that as for the long-time water-driving ultrahigh temperature high-water-content oil reservoir, a 0.1-0.4% welan gum aqueous solution is injected continuously at the speed of 1 mL / min, and the volume of the welan gum aqueous solution is 0.2-2 times that of pores of the oil reservoir. An oil displacing agent, namely the welan gum, is added into oil displacing fluid, a high-permeability area can be selectively sealed, and the permeability of the section of the oil reservoir is adjusted and controlled, so that the oil displacing fluid enters a low-permeability area easily, and high production and stable production of crude oil are achieved. Meanwhile, the welan gum can bear the temperature as high as 140 DEG C, and accordingly the temperature resistance advantage and excellent rheological property of the welan gum make the welan gum the oil displacing agent suitable for the ultrahigh temperature oil reservoir. It is proved through experiments that the effect that the oil displacement efficiency is improved by 6-12% can be achieved, and the technical bottleneck that the ultrahigh temperature oil reservoir is in short of an effective oil displacing agent is solved.

Description

technical field [0001] The invention belongs to the fields of biotechnology and energy exploitation. Specifically, it is a high-temperature-resistant biopolymer welan gum and its application in the development of tertiary oil recovery in ultra-high temperature reservoirs. Background technique [0002] Velan gum is a biological polysaccharide produced by Alcaligenes sp. (ATCC31555). 3 There are α-L-rhamnose or α-L-mannose branched chains connected to the position, and the probability of connecting rhamnose accounts for 2 / 3; in addition, about half of the tetrasaccharide fragments have acetyl and glycerol groups . Velan gum contains 2.8-7.5% acetyl groups and 11.6-14.9% glucuronic acid. The molar ratio of mannose, glucose and rhamnose is 1:2:2. [0003] Welan gum has the following characteristics: [0004] (1) Unique rheology and pseudoplasticity: Welan gum solution is a typical pseudoplastic fluid, and its solution viscosity is inversely proportional to the shear rate, t...

Claims

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Application Information

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IPC IPC(8): E21B43/22C09K8/588
Inventor 马挺李国强张文文吴萌萌史忠
Owner NANKAI UNIV
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