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

Composite gel leaking stoppage material and composite gel leaking stoppage slurry

A technology of composite gel and plugging materials, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problem that the cross-linked polymer gel is easily deformed, affects the success rate of plugging construction, and is difficult to form an effective seal. Blocking and other problems can be achieved to ensure the first-time success rate, shorten the construction operation time, and improve the compressive strength

Inactive Publication Date: 2021-01-29
CHINA PETROCHEMICAL CORP +2
View PDF7 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, due to the widespread difficulty in plugging technology in the deep malignant leakage formations, when using the existing cross-linked polymer gel material as the plugging material for plugging, the plugging material must be injected at a relatively high formation temperature. Under high pressure difference, because the temperature resistance of polymer gel cannot meet the requirements of high well temperature at the bottom of the well, the cross-linked polymer gel is easy to deform and decompose at high temperature, resulting in the compressive strength after plugging Poor, it is difficult to form effective plugging, seriously affecting the success rate of plugging construction

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
  • Composite gel leaking stoppage material and composite gel leaking stoppage slurry
  • Composite gel leaking stoppage material and composite gel leaking stoppage slurry
  • Composite gel leaking stoppage material and composite gel leaking stoppage slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The composite gel plugging material of this embodiment is composed of the following components in parts by weight: 8 parts of suspending agent, 10 parts of gelling agent, 1 part of crosslinking agent, 8 parts of plugging agent, and 5 parts of high-temperature reinforcing agent;

[0031] The suspending agent used is attapulgite, the gelling agent is cellulose-grafted acrylamide copolymer, the cross-linking agent is phenolic resin, the plugging agent is fly ash, and the high-temperature reinforcing agent is nano-silica; The intrinsic viscosity of branched acrylamide copolymer is 4.6, and the degree of hydrolysis is 6.5%.

Embodiment 2

[0033] The composite gel plugging material of this embodiment is composed of the following components in parts by weight: 10 parts of suspending agent, 12 parts of gelling agent, 2 parts of crosslinking agent, 10 parts of plugging agent, and 10 parts of high-temperature enhancer;

[0034] The suspending agent used is attapulgite, the gelling agent is cellulose-grafted acrylamide copolymer, the cross-linking agent is chromium acetate, the plugging agent is fly ash, and the high-temperature reinforcing agent is nano-silica; The intrinsic viscosity of branched acrylamide copolymer is 4.6, and the degree of hydrolysis is 6.5%.

Embodiment 3

[0036] The composite gel plugging material of this embodiment is composed of the following components in parts by weight: 12 parts of suspending agent, 14 parts of gelling agent, 4 parts of crosslinking agent, 12 parts of plugging agent, and 15 parts of high-temperature enhancer;

[0037] The suspending agent used is attapulgite, the gelling agent is cellulose-grafted acrylamide copolymer, the cross-linking agent is sodium borate, the plugging agent is diatomite, and the high-temperature reinforcing agent is nano-silica; The intrinsic viscosity of branched acrylamide copolymer is 4.6, and the degree of hydrolysis is 6.5%.

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
Compressive strengthaaaaaaaaaa
Densityaaaaaaaaaa
Login to View More

Abstract

The invention relates to a composite gel leaking stoppage material and composite gel leaking stoppage slurry, and belongs to the technical field of isolation compositions for plugging leaking strata during well drilling. The composite gel leaking stoppage material comprises the following components in parts by weight: 8-12 parts of a suspending agent, 10-14 parts of a gelatinizing agent, 1-4 partsof a cross-linking agent, 8-12 parts of a plugging agent and 5-15 parts of a high-temperature reinforcing agent, wherein the gelatinizing agent is a polyacrylamide polymer and / or an acrylamide grafted copolymer. According to the composite gel leaking stoppage material, after a leaking stoppage slurry is prepared and injected into a leaking stratum, a chemical reaction can be generated at the stratum temperature, polymer composite gel with a three-dimensional net rack structure can be rapidly formed in a zone close to the well wall, and the toughness and compressive strength of the polymer gelcan be improved through the high-temperature reinforcing agent and the plugging agent, the leaking stoppage efficiency is improved, leaking stoppage slurry is effectively prevented from leaking to the deep part of a leaking layer, and the leaking stoppage construction effect and the one-time success rate are guaranteed.

Description

technical field [0001] The invention relates to a composite gel plugging material and a composite gel plugging slurry, and belongs to the technical field of compositions for drilling and plugging lost formations. Background technique [0002] When oil drilling encounters fractured, fractured-cavity and fractured formations, it is easy to cause drilling fluid leakage, which will cause reservoir pollution and cost loss. For the above-mentioned formations, various plugging materials must be used for plugging to reduce or prevent the loss of drilling fluid. At present, the plugging materials are mainly inert bridging materials, such as peanut shells, walnut shells, sawdust, vermiculite, etc. These materials are mainly suitable for plugging in upper low-temperature loss formations. [0003] However, as the drilling depth continues to increase, the temperature of the formation encountered is getting higher and higher; the risk of encountering unstable formations such as fractured...

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
IPC IPC(8): C09K8/42C09K8/504C09K8/512C09K8/516C09K8/84C09K8/88
CPCC09K8/512C09K8/426C09K8/5045C09K8/516C09K8/845C09K8/887
Inventor 李德红吴天乾宋文宇李明忠李季于培志何斌斌郭瑞
Owner CHINA PETROCHEMICAL CORP