Unlock instant, AI-driven research and patent intelligence for your innovation.

Polymer with selective water shutoff function, preparation method and application thereof

A polymer and selective technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of reducing oil phase permeability, restricting oil well water plugging, poor selectivity, etc., to increase temperature resistance and salt resistance and anti-scourability, improved oil/water selectivity, and reduced water output

Active Publication Date: 2019-05-14
CHINA PETROLEUM & CHEM CORP +1
View PDF10 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] To sum up, most of the selective plugging agents currently used in oil well water plugging are water-soluble polymers such as polyacrylamide and its derivatives to generate gel or jelly in the formation to seal formation water, or use oil The base plugging agent gels or solidifies when it meets water to block water channeling. However, due to its poor selectivity, it will greatly reduce the oil phase permeability while blocking water, resulting in low liquid after plugging, which restricts the application of oil well water plugging technology.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0050] In a second aspect, the present invention provides a method for preparing a polymer with selective water blocking function, wherein the preparation method comprises the following steps:

[0051] (1) Mix monomer A, monomer B and water to form an aqueous solution;

[0052] (2) mixing the monomer C and the emulsifier with the aqueous solution to form an emulsion;

[0053] (3) the emulsion is subjected to a polymerization reaction in the presence of an initiator;

[0054] Wherein, the monomer A is acrylamide; the monomer B is maleic acid; the monomer C is an oil-soluble monomer, and the oil-soluble monomer is styrene and / or octyl methacrylate ; The emulsifier includes a main emulsifier and / or a co-emulsifier.

[0055] The polymerization reaction involved in the method for preparing the polymer with selective water blocking function of the present invention adopts the method of emulsion suspension polymerization.

[0056] The polymerization reaction can also be carried ou...

specific Embodiment approach

[0069] According to a preferred embodiment of the present invention, the preparation method of the polymer with selective water blocking function comprises the following steps:

[0070] Step 1: adding monomer A, monomer B and water into a polymerization reaction bottle (insulated polymerization bottle) to prepare an aqueous solution, and adjusting the pH value of the aqueous solution to 6-10 with alkali;

[0071] Step 2: Add monomer C and emulsifier to the aqueous solution in step 1, and stir evenly to form an emulsion;

[0072] Step 3: At a temperature of 40-60°C, after bubbling nitrogen for 5-60 minutes, add the initiator to the emulsion in step 2, and after bubbling nitrogen to make it evenly mixed, seal polymerization for 6-8 hours to obtain water Water blocking material based on oil-soluble polymer.

[0073] Step 4: Use simulated brine with a salinity of 150,000mg / L to prepare the water blocking material into an aqueous solution with a mass concentration of 0.1%, which i...

Embodiment 1

[0087] This example is to illustrate the polymer with selective water blocking function prepared by the method provided by the present invention.

[0088] 1. Weigh 2.9g of acrylamide (based on 100 parts by weight of water, the amount of monomer A is 0.97 parts by weight) and 0.3g of maleic acid (based on 100 parts by weight of water, the amount of monomer B 0.1 parts by weight) was added into 300mL of water and stirred to fully dissolve, and the pH value of the aqueous solution was adjusted to 6.0 with alkali (sodium hydroxide) to obtain a stable aqueous solution;

[0089] 2. Take by weighing 6.0g styrene (based on the water of 100 parts by weight, the consumption of monomer C is 2 parts by weight), 1.5g main emulsifier SDBS (based on the water of 100 parts by weight, the consumption of main emulsifier 0.5 parts by weight) and 1.5g co-emulsifier Span 20 (based on 100 parts by weight of water, the amount of co-emulsifier is 0.5 parts by weight) are added to the above solution, ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
scour resistance multipleaaaaaaaaaa
scour resistance multipleaaaaaaaaaa
scour resistance multipleaaaaaaaaaa
Login to View More

Abstract

The invention relates to the research field of profile control and water shutoff materials in oil fields and improving the productivity of oil wells in oil reservoirs in high water cut periods, and discloses a polymer with a selective water shutoff function, wherein the polymer is prepared by polymerizing an emulsion containing a monomer A, a monomer B, a monomer C and an emulsifier in the presence of an initiator and water serving as a solvent; the monomer A is acrylamide; the monomer B is maleic acid; the monomer C is an oil soluble monomer, and the oil soluble monomer is styrene and / or octyl methacrylate; and the emulsifier comprises a main emulsifier and / or a co-emulsifier. The polymer has an excellent effect of selectively blocking water without blocking oil, and has a higher scouringresistance multiple.

Description

technical field [0001] The present invention relates to the field of oilfield profile control and water shutoff materials and the research field of improving oil well productivity in high water cut period, in particular, to a polymer with selective water shutoff function, a polymer with selective water shutoff function The method and the polymer with selective water shutoff function prepared by the method, and the application of the polymer with selective water shutoff function as selective water shutoff agent. Background technique [0002] Oil well water plugging technology is a key technology to optimize the water injection development results of oil and gas fields. The water layer and the oil layer in the formation are intertwined with each other, and the heterogeneity is serious. The existing construction technology is difficult to effectively isolate the two reservoirs. Considering the water content, higher requirements are put forward for water shutoff agents with hig...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C08F212/08C08F220/18C08F220/56C08F222/02C08F2/26C08F2/30C09K8/508
Inventor 赵方园杨捷王晓春
Owner CHINA PETROLEUM & CHEM CORP