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Oil well dual crosslinking selective plugging agent

A technology of double crosslinking and water blocking agent, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., which can solve the problems of inability to effectively block the oil layer in the water layer, complete unblocking of the oil layer, low selectivity, inconvenient use, etc. problems, to achieve the effect of prolonging the effective period of plugging, high recovery rate and preventing regurgitation

Inactive Publication Date: 2014-12-31
NORTHEAST GASOLINEEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The selectivity of the existing selective water blocking agent is not high, and it cannot achieve effective plugging of the water layer and complete unblocking of the oil layer, and there are problems of inconvenient use and high cost

Method used

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  • Oil well dual crosslinking selective plugging agent
  • Oil well dual crosslinking selective plugging agent
  • Oil well dual crosslinking selective plugging agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1 : Gelling performance experiment of double cross-linked selective water shutoff agent for oil well

[0031] According to the formula given in the summary of the invention and the preparation method thereof, the dual cross-linking selective water shutoff agent for oil wells is prepared. Curing at 60°C for a certain period of time, measure its viscosity, the data are shown in Table 1:

[0032] Table 1 Evaluation of gelation performance of selective plugging agent

[0033] Curing time, h 0 12 24 36 48 60 72 84 Viscosity, mPa·s 55 56 240 8590 24600 40230 50540 51850

[0034] Experiments show that the initial viscosity of the selective plugging agent is low, the strength after gelation is greater than 50000 mPa·s, and the gelation time is about 36 hours.

Embodiment 2

[0035] Example 2 : Determination experiment of long-term stability of double selective water shutoff agent for oil well

[0036] According to the method of Example 1, the water shutoff agent was prepared and placed in the reaction bottle, and its strength was measured by regular sampling. The experimental results are shown in Table 2.

[0037] Table 2 Stability evaluation of dual selective water shutoff agents for oil wells

[0038] Maintenance time, month 0 2 4 6 8 10 12 14 Viscosity, mPa·s 50500 51600 51400 51120 50800 50230 50140 50050

[0039] The results show that the dual-selective water shutoff agent for oil wells can be stable for more than one year at 60°C for a long period of time without dehydration or gel breaking. In the early stage of gel formation, the strength of dual selective water shutoff agent for oil wells gradually increases and reaches the maximum value, and then the strength decreases slightly, but the loss rate a...

Embodiment 3

[0040] Example 3 : Oil Solubility Test of Oil Soluble Resins

[0041] The oil-soluble resin is prepared according to the preparation method of part of the oil-soluble resin in the content of the invention. During the experiment, constant temperature treatment was maintained at different temperatures, and the temperatures adopted were room temperature and 70°C, respectively. In order to better evaluate its oil solubility, the experiment was divided into two groups to do parallel experiments.

[0042] experiment one:

[0043] a) At room temperature, use a balance to weigh 20g of oil-soluble resin No. I and No. II particles respectively, place them in a test tube containing 150mL of kerosene, and tightly stopper the bottle;

[0044] b) Filter, dry, wash, dry, weigh with filter paper at a certain time interval, and record the data;

[0045] c) Calculate the oil solubility rate of oil-soluble resin in kerosene at each time, that is, the degree of solubility in oil.

[0046]...

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Abstract

The invention discloses an oil well dual crosslinking selective plugging agent, and solves the problems that the selectivity of selective plugging agents in the prior art is not high, and effective plugging of a water layer and complete unblocking of an oil layer cannot be achieved. The oil well dual crosslinking selective plugging agent comprises the following components by mass: 2% of dispersing agent calcium lignosulfonate, 0.6% of suspending agent polyacrylamide, 0.9% of a cross-linking agent, 8% of oil soluble resin, and balance of water; wherein the 0.9% of crosslinking agent comprises 0.4% of reductant thiourea and 0.5% of oxidizing agent potassium dichromate. Compared with general plugging agents, water phase plugging rate and oil phase recovery rate of the oil well dual crosslinking selective plugging agent are higher, and the selective water plugging performance of the oil well dual crosslinking selective plugging agent is more superior.

Description

Technical field [0001] The present invention involves a kind of oil field auxiliary used in the process of stabilizing production and increase in production and increasing the harvesting process. It is specifically a selective water blocking agent used in water blocking operations. Background technique [0002] The water blocking agent is an indispensable material in the water blocking operation. The quality of its quality is directly related to the success or failure of the water blocking operation, which plays a key role in the effect of stable and increasing production of oil fields.In order to maintain strata energy and improve the effect of water blocking, to maximize the role of water blocking agents, according to the characteristics of the strata, the formula of the water blocking agent is comprehensively screened to meet the requirements of the water blocking process and compatible with the strata to meet the high yield of the oilfield and stable production.Purpose. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/512
CPCC09K8/512
Inventor 王继刚刘庆旺单五一李吉王胡振赵景园
Owner NORTHEAST GASOLINEEUM UNIV
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