Temporary plugging agent and preparation method thereof

A technology of temporary plugging agent and cross-linking agent, which is applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc. It can solve the problems of large formation leakage, poor sand-carrying ability, and large water consumption, and achieve Easy to remove blockage, reduce production time, and improve production time rate

Inactive Publication Date: 2017-10-24
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, this process has disadvantages such as large formation loss, long liquid drainage period during production, poor sand-carrying ability, and large water consumption.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0043]The present embodiment provides a temporary plugging agent, the total mass of the temporary plugging agent is 100wt%, the raw material composition of the temporary plugging agent includes 33wt% high-temperature salt-resistant ultra-high molecular weight polymer (phenolic resin), 30wt% Modified oil-soluble resin (alkyd resin, acrylic resin, mass ratio 2:3), 19wt% crosslinking agent (acrylic acid), 10wt% surfactant (sodium dodecylbenzenesulfonate and stearic acid , mass ratio 1:1), 4wt% of solid phase particles (carbon powder), 4wt% of fiber heat-resistant material (polyimide fiber); wherein, each raw material composition in the temporary plugging agent is solid particles, and The particle size is 200-300 mesh.

[0044] Above-mentioned temporary blocking agent is prepared through the following steps:

[0045] Adding a cross-linking agent to the high temperature-resistant and salt-resistant ultra-high molecular weight polymer and modified oil-soluble resin at 60°C, stirrin...

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Abstract

The invention provides a temporary plugging agent and a preparation method thereof. With the total mass of the temporary plugging agent as 100wt%, the temporary plugging agent comprises the raw materials of 25-35wt% of a high temperature salt-resistant extra high molecular polymer, 25-30wt% of modified oil soluble resin, 15-20wt% of a cross-linking agent, 5-10wt% of a surface active agent, 1-5wt% of solid particles and 1-5wt% of a fiber temperature-resistant material, wherein the sum of the mass percents of the raw materials of the temporary plugging agent is 100%; and the raw materials of the temporary plugging agent are all solid particles, and the diameters of the particles are 200-300 meshes. The invention further provides the preparation method of the temporary plugging agent. The temporary plugging agent can conduct continuous sand washing on an oil well, change of output after operation is not large, and construction and plug removal can succeed for one time; and the temporary plugging agent is suitable for sand washing construction of a heavy oil well, the sand washing effect is good, sand washing is thorough, the leakage amount is less, and the pump inspection period is prolonged.

Description

technical field [0001] The invention relates to a temporary plugging agent and a preparation method thereof, which belong to the technical field of petroleum exploitation. Background technique [0002] The heavy oil wells in Liaohe Oilfield have the characteristics of "sparse, scattered, shallow, and thin", and the sandstone in the oil layer is poorly cemented. After multiple rounds of steam injection huff and puff production, some sand particles are carried out of the ground by crude oil, resulting in the gradual formation of larger pores in the oil layer. [0003] During oil well production, the formation sand is deposited in the wellbore with the liquid flow, which is easy to sand and bury the oil layer, or enters the pump barrel to cause the pump to be stuck; during the operation of sand washing, due to the serious shortage of the formation, the sand particles re-enter and deposit in the wellbore with the sand washing fluid. In the large channel, the sand does not return...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13C09K8/512
CPCC09K8/512C09K8/5083C09K8/5086C09K2208/08E21B33/13
Inventor 李尚莹匡旭光陈帅唐大明王泽宇李晓龙韩承刚
Owner PETROCHINA CO LTD
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