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Chemical reservoir oil displacement method suitable for super-high water-sensitive heavy oil reservoir

A technology for chemical flooding and heavy oil, applied in chemical flooding and heavy oil chemical flooding of super water-sensitive heavy oil reservoirs, can solve the problems of poor water flooding effect, etc. The effect of low cost and high oil washing rate

Pending Publication Date: 2019-12-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Simple water flooding is not effective
At present, there is no effective production technology for this type of reservoir applied to the field.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The selection of embodiment 1 clay stabilizer

[0027] (1) Selection of clay stabilizer concentration satisfying anti-swelling rate ≥ 90%

[0028] Weigh 3.00g clay stabilizer and prepare 1000ml solution with test water.

[0029] Weigh 0.50g of sodium bentonite, accurate to 0.01g, put it into a 10ml centrifuge tube, add 10ml of clay stabilizer solution, shake well, place it at room temperature for 2h, put it into a centrifuge, and centrifuge at a speed of 1500r / min After 15 minutes, read the volume V of sodium bentonite after swelling 1 .

[0030] Use test water instead of clay stabilizer solution to measure the expansion volume V of sodium bentonite in test water 2 .

[0031] Using kerosene instead of clay stabilizer solution, determination of expansion volume V of sodium bentonite in kerosene 0 .

[0032] The anti-expansion rate is according to the formula B=(V 2 -V 1 ) / (V 2 -V 0 )calculate.

[0033] Change the sample concentration to 0.4%, 0.5%, repeat the ...

Embodiment 2

[0041] Embodiment 2 The selection of viscous oil displacement agent for heavy oil

[0042] (1) Satisfy interfacial tension≤1×10 -1 Selection of concentration of heavy oil viscosity reducing oil displacement agent in mN / m

[0043]Inject water into the target block to prepare 100 g of a 0.3% thick oil viscosity-reducing oil displacement agent sample solution. After stirring for 15 minutes at a speed of 300 r / min on a magnetic stirrer, according to the provisions of 3.3 in SY / T 5370-1999, Measure the interfacial tension between the sample solution and the oil sample of the target block at the storage temperature (rotating speed 5000r / min), and record the lowest value of the interfacial tension.

[0044] Change the sample concentration and record the interfacial tension ≤1×10 -1 The concentration of heavy oil viscosity reducing oil displacement agent in mN / m.

[0045] (2) Satisfy the interfacial tension after adsorption ≤ 1×10 -1 Concentration Selection of Viscosity Reducing O...

Embodiment 3

[0082] Example 3 Field application of chemical flooding method suitable for super water-sensitive heavy oil reservoirs

[0083] The main component of a kind of clay stabilizer that utilizes embodiment 1 method selection to obtain is:

[0084] (1) hydroxyaluminum citrate, 15%;

[0085] ⑵TDC-15 clay stabilizer, 20%;

[0086] (3) KCl, 15%;

[0087] (4) dodecyl dimethyl benzyl ammonium chloride, 5%;

[0088] (5) Polytrimethylallyl ammonium chloride, 8%;

[0089] ⑹ water, 37%.

[0090] At 0.3% concentration of clay stabilizer, the anti-swelling rate is 90.6%, and the core permeability damage rate is 4.7%.

[0091] The main component of a kind of heavy oil viscosity reducing oil displacement agent that utilizes embodiment 2 method selection to obtain is:

[0092] (1) Fatty alcohol polyoxyethylene ether carboxylate, 17%;

[0093] ⑵ Fatty alcohol polyoxyethylene ether sulfonate, 20%;

[0094] (3) Isopropanol, 20%;

[0095] (4) Water, 43%.

[0096] The interfacial tension mea...

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Abstract

The invention belongs to the field of petrochemistry and relates to a chemical reservoir oil displacement method for heavy oil, in particular to a chemical reservoir oil displacement method suitable for a super-high water-sensitive heavy oil reservoir. The chemical reservoir oil displacement method comprises the following steps that a clay stabilizer and a heavy oil viscosity reduction oil displacement agent are selected; the selected clay stabilizer is injected, and the injection period is 20-40 days; water is injected, and the injection period is 10-20 days; and the selected heavy oil viscosity reduction oil displacement agent is injected, the injection period is 180 days or above, or the clay stabilizer is injected in a switching mode according to the sand production condition of an oilwell. Through the chemical reservoir oil displacement method, the problem of difficult oil extraction of the super-high water-sensitive heavy oil reservoir is solved, and the effect that the oil extraction quantity of the super-high water-sensitive heavy oil reservoir can be increased through the chemical reservoir oil displacement method is proved by practical application.

Description

technical field [0001] The invention belongs to the field of petrochemical industry and relates to a heavy oil chemical flooding method, in particular to a chemical flooding method suitable for super water-sensitive heavy oil reservoirs. Background technique [0002] Jinjia Oilfield is located in Maqiao Township, Huantai County, Shandong Province. The structure is located in the slope zone at the southwestern edge of Dongying Sag, at the southern end of the Jinjia Fanjia nose-shaped structural belt. The work area covers an area of ​​48.0km 2 , Proven geological reserves of 370 million tons. Block Jin 8 is located in the south of Jinjia Oilfield, with the Luxi Uplift in the south, Block 9 in the west and Block 10 in the north. The main oil-bearing layer of Jin 8 block is Shasan Shang, with a buried depth of 800-1000 meters and an oil-bearing area of ​​1.27km 2 , geological reserves of 3.7274 million tons. The structural form is a monoclinic structure high in the south and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22
CPCE21B43/16
Inventor 刘小波吴伟梁书义李迎春姜东波陈绪清任伟伟耿红霞王佩佩徐新丽
Owner CHINA PETROLEUM & CHEM CORP
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