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

Multi-component acid fracturing temporary plugging agent and preparation method thereof

A multi-component, temporary plugging agent technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of affecting oil recovery efficiency, poor plugging effect, and increasing costs, and reduce formation damage and use. Safe, high temporary blocking rate effect

Inactive Publication Date: 2015-09-30
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY +1
View PDF2 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, related technologies cannot take into account the temporary plugging rate, acid solubility rate, and temperature resistance of temporary plugging agents, which not only affects oil production efficiency, but also causes great damage to formations; at the same time, related technologies often simply adopt increasing Physical methods such as large filling volume not only increase the cost, but also have poor plugging effect

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
  • Multi-component acid fracturing temporary plugging agent and preparation method thereof
  • Multi-component acid fracturing temporary plugging agent and preparation method thereof
  • Multi-component acid fracturing temporary plugging agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0028] Preparation Example 1: Preparation of Starch Graft Copolymer

[0029] Mix 15g of starch with water evenly, gelatinize at 60-80°C for 1-1.5h under stirring condition, and then cool to room temperature. Put the gelatinized starch into the reaction kettle, add 150g of acrylamide, 80g of acrylic acid and 110g of 3-methacrylamidopropyltrimethylammonium chloride in sequence, stir until dissolved, and dissolve the reaction mixture system through sodium hydroxide solution The pH value was adjusted to be in the range of 10-11. The temperature of the reaction mixture system was raised to 60° C. and nitrogen was passed to remove the oxygen in the system, and the reaction was maintained for 15 min under continuous stirring, and then the initiator (NH 4 ) 2 S 2 o 8 -Na 2 SO 3 And continue to react for 0.5-2h to obtain a white viscous gel-like starch graft copolymer product.

[0030] The prepared starch graft copolymer product is granulated to form solid granules for use.

preparation example 2

[0031] Preparation Example 2: Preparation of Fibrous Polyester Reinforcing Agent

[0032] The catalytic amount of Sn(Oct) 2 Dissolved in toluene to form Sn(Oct) 2 - Toluene solution. Lactide and Sn(Oct) 2 -Put the toluene solution into a single-necked round bottom flask, reduce the pressure to 0.098MPa and heat slowly. After the solid in the flask is completely dissolved, seal the flask and fully extract the solvent, then dry the flask under reduced pressure at 35°C for 3 hours to fully remove Toluene solvent. Next, the flask was evacuated to 0.099 MPa, and then reacted at an oil bath temperature of 130° C. for 8 h. Finally, dissolve the solid in the flask with ethyl acetate and pour it into a polytetrafluoroethylene crucible to air-dry until the ethyl acetate is completely volatilized to obtain a white fibrous polyester reinforcing agent product.

Embodiment 1-3

[0034] The multi-component acid pressure temporary plugging agents of Examples 1-3 were prepared in the same way.

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 multi-component acid pressure temporary plugging additive and a preparation method of the temporary plugging additive. The temporary plugging additive comprises the following raw materials in percentages by weight: 30-43% of starch graft copolymer, 25-35% of acrylic acid-acrylamide crosslinking copolymer, 5-16% of fibrous polyester enhancer, and 6-25% of auxiliary. The temporary plugging additive provided by the invention comprises a plurality of polymer components, simultaneously has high acid solubility, high temporary plugging rate and high temperature resistance by means of combined functions of these components, can achieve in-time acid solution on the premise of ensuring the plugging rate and the strength, and can fully meet the requirements on the efficiency and the performance in the later development of a low permeability oil well; the temporary plugging additive can be applied to plugging cracks with different widths by regulating the contents of the components and therefore has wider adaptability and stronger flexibility; in addition, in the components of the temporary plugging additive, the starch graft copolymer is wide in sources, low in price, and safe to use, and does not cause harm to a human body or environment pollution, and as the fibrous polyester enhancer is easy to decompose and reversely discharge, the temporary plugging additive not only facilitates practical operation, but also can reduce the damage to the stratum.

Description

technical field [0001] The invention belongs to the field of oil field chemistry, and relates to a temporary plugging agent, more specifically, to a multi-component acid fracturing temporary plugging agent and a preparation method thereof. Background technique [0002] After initial fracturing in low-permeability oilfields, the single well production will gradually decrease, so refracturing or repeated acid fracturing technology must be relied on to increase production. However, conventional refracturing or repeated acid fracturing in the same well and layer generally has the problem of poor oil increase effect. Partially restore the conductivity of the original fractures, but the impact on the displacement area of ​​the injected water in the injection-production well pattern is relatively limited; Such measures may lead to a sharp rise in the water cut of construction wells after repeated fracturing or repeated acid fracturing. [0003] For oil and gas wells that are in t...

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): C09K8/74C08F251/00C08F220/06C08F220/56
Inventor 周成裕刘洪王寿平张庆生王栋侯夏阳
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY