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

A kind of drag reducer and its preparation method and application

A technology of drag reducer and polyether polyol, which is applied in the direction of chemical instruments and methods, bulk chemical production, drilling composition, etc., can solve the problems of difficult construction, easy gas channeling, easy leakage and increased production, and achieves The effect of good solubility

Active Publication Date: 2021-11-26
RES INST OF SHAANXI YANCHANG PETROLEUM GRP +1
View PDF10 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Carbon dioxide fracturing can significantly increase the complexity and expansion orientation of fractures around the wellbore. However, due to the low viscosity and strong filter loss of carbon dioxide itself, the requirements for the displacement of carbon dioxide fracturing are relatively high. High frictional resistance, about 1.5 times that of guar gum fracturing fluid, leads to high wellhead pressure during on-site construction, difficult construction, less sand-carrying, easy gas channeling, easy leakage and unsatisfactory production stimulation effect in actual field application, etc. The problem is that the construction displacement cannot meet the design requirements, so it is urgent to develop a drag reducer suitable for liquid carbon dioxide fracturing fluid

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
  • A kind of drag reducer and its preparation method and application
  • A kind of drag reducer and its preparation method and application
  • A kind of drag reducer and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This embodiment provides a drag reducer for reducing the resistance of liquid carbon dioxide fracturing, which is prepared through the following steps.

[0030] Preparation of polyether polyol: tetrahydrofuran and propylene oxide undergo ring-opening polymerization under catalysis, and undergo neutralization, water washing, dehydration, and filtration to prepare tetrahydrofuran-propylene oxide copolymer glycol with a molecular weight of 2000.

[0031] Mix tetrahydrofuran-propylene oxide copolyethylene glycol with polydimethylsiloxane with a viscosity of 8000 at a mass ratio of 5:2, and mix them uniformly.

[0032] Prepare polylauryl methacrylate, prepare according to the following steps:

[0033] Dissolve 40mL of lauryl methacrylate and 22mL of divinylbenzene in 87mL of N,N-dimethylformamide to obtain a mixed solution;

[0034] Dissolve 2g-4g of azobisisobutyronitrile in 38mL of absolute ethanol, add dropwise to the mixture under constant stirring, raise the temperatur...

Embodiment 2

[0038] When water is used for carbon dioxide fracturing, the pressure difference between the inlet and outlet of the pipeline is 0.73Mpa. After adding the drag reducing agent in Example 1, the pressure difference between the inlet and outlet is reduced to 0.27Mpa, and the drag reduction rate exceeds 55 %, reaching 63.1%.

[0039] This embodiment is used in oil and gas drilling operations. During the fracturing process, the mass ratio of the added drag reducer to carbon dioxide is 0.3%-0.5%. Before the carbon dioxide is introduced, the drag reducer The agent can be added to the pipeline. The drag reducer in supercritical CO 2 During the fracturing process, the drag reduction rate can reach up to 63%, which can be degraded by water / hydrocarbons, or can be flowed back quickly after fracturing to prevent damage caused by formation retention. At the same time, the drag reducer and liquid CO 2 It has good solubility and can form a uniform mixed solution within 2 minutes. After add...

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 provides a drag reducer and its preparation method and application. The raw materials of the drag reducer are polyether polyols, polydimethylsiloxane and polylauric methacrylate; wherein, the mass ratio of polyether polyols to polylauric methacrylate is 1:1-6: 1. The volume ratio of polyether polyol solution containing polylauryl methacrylate to polydimethylsiloxane is 2:1‑4:1. The drag reducer of the invention can effectively solve the problem of high resistance in the supercritical carbon dioxide fracturing process without significantly increasing the viscosity of the supercritical carbon dioxide.

Description

technical field [0001] The invention relates to a drag reducer, in particular to a drag reducer capable of reducing the resistance of liquid carbon dioxide during fracturing, and belongs to the technical field of petroleum exploitation. Background technique [0002] Carbon dioxide fracturing can significantly increase the complexity and expansion orientation of fractures around the wellbore. However, due to the low viscosity and strong filter loss of carbon dioxide itself, the requirements for the displacement of carbon dioxide fracturing are relatively high. High frictional resistance, about 1.5 times that of guar gum fracturing fluid, leads to high wellhead pressure during on-site construction, difficult construction, less sand-carrying, easy gas channeling, easy leakage and unsatisfactory production stimulation effect in actual field application, etc. The problem is that the construction displacement cannot meet the design requirements, so it is urgent to develop a drag r...

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 Patents(China)
IPC IPC(8): C09K8/60C09K8/68C09K8/88C08F220/18C08F212/36C08G65/06C08G65/20
CPCC08F220/18C08G65/06C08G65/20C09K8/604C09K8/68C09K8/882C09K8/885C09K2208/28Y02P20/54
Inventor 孙晓徐泉田守嶒穆景福郭兴王海柱
Owner RES INST OF SHAANXI YANCHANG PETROLEUM GRP