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

Method for preparing novel thermotropic hard hydrogel oil well water shutoff agent

A water blocking agent and hard water technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of non-selectivity of formation water, poor adhesion of hydrophilic rocks, low strength, etc., and achieve excellent sealing. The ability to plug the formation water in oil wells and the reliable effect of the preparation process

Active Publication Date: 2020-11-20
QINGDAO UNIV
View PDF5 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For many years, the research on oil well plugging agents has been continuous at home and abroad, but there is no ideal selective profile control and water plugging materials at present. The materials currently used are mostly inorganic clay, cement, water glass, various organic frozen Gel (polyacrylamide jelly), organogel (polysaccharide), etc., generally have the following problems: 1. No selectivity to formation water; 2. Poor adhesion to hydrophilic rocks and low breakthrough pressure ; 3. Low strength, poor toughness, easy to break, etc.

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing novel thermotropic hard hydrogel oil well water shutoff agent
  • Method for preparing novel thermotropic hard hydrogel oil well water shutoff agent
  • Method for preparing novel thermotropic hard hydrogel oil well water shutoff agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0006] (1) Add 0.2mol acrylic acid, 0.05mol cinnamic acid and 100mL distilled water into a 250mL three-neck reaction flask, stir to dissolve, then add 0.005g ammonium persulfate, blow in nitrogen for 10 minutes, slowly heat up to 55°C for 1 hour, keep warm After reacting for 3 hours, cool down naturally until the temperature drops to 25°C to obtain a colorless, transparent and uniform liquid, which is then poured into a 500mL beaker for use;

[0007] (2) Add 0.01mol sodium phytate, 0.02mol edetate disodium and 0.05mol calcium acetate into 50mL of clear water, stir to dissolve, then add to the above (1), stir thoroughly for 30 minutes to obtain a colorless colloid.

Embodiment 2

[0009] Accurately weigh the colloid samples prepared in Example 1(2), dilute them with water respectively, and prepare aqueous solutions with different dilution ratios. The viscosity of each solution at three temperatures of 30°C, 50°C and 80°C was measured with a BROOKFILD DV-III+ rheometer; the results are shown in Table 1.

[0010] Table 1 Viscosities of water shutoff agents at different temperatures and different dilution ratios (mPa.s)

[0011]

Embodiment 3

[0013] Take 50.0 g of the colloid sample prepared in Example 1 (2) respectively, make a film with a size of 5 cm × 1 cm × 1 cm, and place it for 48 hours; measure the tensile force and elongation of the three films when they break with a tensile meter. The results are shown in Table 2.

[0014] Table 2 Gel strength at different temperatures

[0015]

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

No PUM Login to View More

Abstract

The invention relates to a method for preparing a thermotropic hard hydrogel oil well water shutoff agent from acrylic acid, cinnamic acid, sodium phytate, ethylenediamine tetraacetic acid disodium salt and calcium acetate as main raw materials. The method comprises the following steps: firstly, preparing an acrylic acid-cinnamic acid binary copolymer from acrylic acid and cinnamic acid as raw materials, and dissolving the polymer, sodium phytate, ethylenediamine tetraacetic acid disodium salt and calcium acetate in clear water according to a certain proportion to prepare the thermohardening hydrogel. The hydrogel is easy to flow at a temperature lower than 50 DEG C and hardens at a temperature higher than 50 DEG C. By utilizing the thermohardening temperature-sensitive characteristic of the hydrogel, a water outlet duct can be effectively blocked in an oil layer with the temperature higher than 50 DEG C, the hydrogel has excellent capability of blocking formation water of an oil well,the preparation process is reliable, and the invention provides a preparation method of a novel temperature-sensitive oil well water plugging agent.

Description

technical field [0001] The invention belongs to the field of oil recovery additives, and in particular relates to a method for preparing a thermal hard water gel oil well water shutoff agent with acrylic acid, cinnamic acid, sodium phytate, disodium edetate and calcium acetate as main raw materials. Background technique [0002] With the continuous deepening of oilfield development, the water production of oil wells is becoming more and more serious, and the increase of water cut will inevitably lead to the decline of crude oil production. Water plugging and profile control has become the dominant technology for water control and oil stabilization in high water cut period. It can alleviate the contradictions caused by interwell interference caused by uneven distribution of liquid flow on the plane during water injection development period, and the difference in producing degree between layers and layers in the vertical direction. , to increase the degree of water drive in th...

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): C09K8/508C09K8/516
CPCC09K8/516C09K8/5083
Inventor 麻金海孔淑玲
Owner QINGDAO UNIV