Oil-in-water emulsion for horizontal well water plugging and preparation method of oil-in-water emulsion

An oil-in-water emulsion, horizontal well technology, applied in chemical instruments and methods, earth-moving drilling, wellbore/well components, etc., can solve problems such as unsatisfactory water blocking effect, low water blocking strength, and withdrawal plugging strength. , to achieve the effect of good water blocking effect, simple preparation process and low initial viscosity

Active Publication Date: 2017-03-15
YANTAI ZHIBEN INTPROP OPERATIONS MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently commonly used plugging agents have the following problems: (1) The plugging agent is not selective enough to block water, but at the same time the oil production is also reduced, and the economic benefit is poor
(2) It is difficult for the plugging agent to enter the deep part, the strength of the plugging agent is weak, it is prone to vomiting or the plugging strength is not high, the validity period is short, and the water plugging effect is not ideal
(3) The applicable reservoir chemical environment of plugging agent is narrow
The invention patent "A Heavy Oil Emulsion Phase-Inverting Profile Control Water Plugging Agent" (Application No. 201510535437.X) also uses heavy oil that does not damage the oil layer as the main material, and prepares an oil-in-water emulsion, which is reversed after reaching the formation. Phase plugging, but limestone powder is used as a stabilizer, which reduces the stability of placement. At the same time, there are many types of emulsifiers and phase inversion agents, which increases the cost

Method used

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  • Oil-in-water emulsion for horizontal well water plugging and preparation method of oil-in-water emulsion
  • Oil-in-water emulsion for horizontal well water plugging and preparation method of oil-in-water emulsion
  • Oil-in-water emulsion for horizontal well water plugging and preparation method of oil-in-water emulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The raw materials (parts by weight) used in the horizontal well water plugging oil-in-water emulsion A are: heavy oil 30, deionized water 60, alkylphenol polyoxyethylene ether 0.1, sorbitan oleate 0.2 and polyethylene glycol 0.1.

[0021] The preparation method of oil-in-water emulsion A for water plugging in horizontal wells, the specific steps are as follows:

[0022] (2) Preparation of water phase

[0023] Take 60g of deionized water and put it into a beaker, heat the deionized water to 40°C, add 0.1g of alkylphenol polyoxyethylene ether into the deionized water, stir evenly, the stirring speed is 200rpm, and the stirring time is 10min. After the stirring time is over, Naturally cool down to room temperature to obtain an aqueous phase;

[0024] (2) Preparation of oil phase

[0025] Take 30g of thick oil and put it into a beaker, heat the thick oil to 50°C, add 0.2g of sorbitan oleate to the thick oil, stir evenly, the stirring speed is 500rpm, and the stirring tim...

Embodiment 2

[0028] The raw materials (parts by weight) used in the water plugging oil-in-water emulsion B of the horizontal well are: heavy oil 32, deionized water 65, polyoxyethylene sorbitan monostearate 0.13, sorbitan oleate 0.28 and Polyethylene glycol 0.15.

[0029] The preparation method of oil-in-water emulsion B for water plugging in horizontal wells, the specific steps are as follows:

[0030] (1) Preparation of water phase

[0031] Take 65g of deionized water and put it into a beaker, heat the deionized water to 42°C, add 0.13g of polyoxyethylene sorbitan monostearate to the deionized water, stir well, the stirring speed is 280rpm, and the stirring time is 18min. Naturally cool down to room temperature after the stirring time ends to obtain an aqueous phase;

[0032] (2) Preparation of oil phase

[0033] Take 32g of thick oil and put it into a beaker, heat the thick oil to 60°C, add 0.28g of sorbitan oleate to the thick oil, stir evenly, the stirring speed is 550rpm, and the ...

Embodiment 3

[0036] The raw materials (parts by weight) used in the horizontal well water plugging oil-in-water emulsion C are: heavy oil 35, deionized water 63, alkylphenol polyoxyethylene ether 0.16, sorbitan oleate 0.22 and polyethylene glycol 0.17.

[0037] The preparation method of oil-in-water emulsion C for water plugging in horizontal wells, the specific steps are as follows:

[0038] (1) Preparation of water phase

[0039] Take 63g of deionized water and put it into a beaker, heat the deionized water to 45°C, add 0.16g of alkylphenol polyoxyethylene ether into the deionized water, stir evenly, the stirring speed is 250rpm, and the stirring time is 13min. After the stirring time is over, Naturally cool down to room temperature to obtain an aqueous phase;

[0040] (2) Preparation of oil phase

[0041] Take 35g of thick oil and put it into a beaker, heat the thick oil to 65°C, add 0.22g of sorbitan oleate to the thick oil, stir evenly, the stirring speed is 580rpm, and the stirrin...

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Abstract

The invention belongs to the field of oilfield development technologies, and in particular relates to an oil-in-water emulsion for horizontal well water plugging and a preparation method of the oil-in-water emulsion. The emulsion is prepared from the following preparation materials in parts by weight: 30-40 parts of thickened oil, 60-70 parts of deionized water, 0.1-0.2 part of a water-soluble surfactant, 0.2-0.3 part of an oil-soluble surfactant and 0.1-0.2 part of a stabilizer. The emulsion disclosed by the invention has the advantages of simple preparation process, low cost, low initial viscosity and simplicity in injection; the coated high-viscosity thickened oil phase is released after demulsification or phase inversion, or a viscous oil-in-water phase is further formed, so that the water outlet is subjected to safety plugging; the plugging agent is high in selectivity, is inversed with highly mineralized water to become viscous for plugging, and is invariable when meeting oil. The product disclosed by the invention has the initial viscosity of being lower than 10 mPa.s, the plugging rate is 85% or higher, and the water plugging effect is good.

Description

technical field [0001] The invention belongs to the field of oil field development technology, in particular to an oil-in-water emulsion for water plugging of horizontal wells and a preparation method thereof. [0002] technical background [0003] Water plugging technology is to inject plugging agent into the oil well to block the water outlet channel, reduce the ineffective oil recovery of the oil well and the water content of the produced oil. Horizontal wells increase the length of the wellbore in the production layer and the drainage area, and can develop oil reservoirs under low pressure difference, increase the rate of reservoir and fracture encounters, effectively solve the problems faced in the development of oil and gas fields, and achieve "sparse wells with high production" "the goal of. One of the most important problems is that because the wellbore of the horizontal well is parallel to the oil reservoir, it is easy to produce a large amount of water in the horiz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/508E21B33/138
CPCC09K8/5086E21B33/138
Inventor 赵世芬
Owner YANTAI ZHIBEN INTPROP OPERATIONS MANAGEMENT CO LTD
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