Self-degradable leaking-prevention and stoppage material and preparation method thereof, self-degradable leaking-prevention and stoppage product and application thereof

A plugging material and self-degradation technology, which is applied in the field of petroleum exploration, can solve the problems of incompatibility, easy leakage, and high density of inorganic salt solution due to the coexistence of various leakages, and achieve excellent self-degradation performance, synergistic optimization, Effect of Excellent Permeability Recovery Rate

Inactive Publication Date: 2016-12-07
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its disadvantages are: there is not only the matching problem of particle diameter and formation pores, but also acidizing and plugging removal after workover operations
The disadvantage is that the density of the inorganic salt solution is relatively high, and l

Method used

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  • Self-degradable leaking-prevention and stoppage material and preparation method thereof, self-degradable leaking-prevention and stoppage product and application thereof
  • Self-degradable leaking-prevention and stoppage material and preparation method thereof, self-degradable leaking-prevention and stoppage product and application thereof
  • Self-degradable leaking-prevention and stoppage material and preparation method thereof, self-degradable leaking-prevention and stoppage product and application thereof

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preparation example Construction

[0028] In another typical embodiment of the present invention, a method for preparing a self-degradable anti-leakage plugging material is also provided. The preparation method includes: step S1, according to any one of the above-mentioned raw materials for the self-degradable anti-leakage plugging material Proportioning and preparing a raw material mixture; step S2, reacting the raw material mixture under heating and pressure to obtain a self-degradation leak-proof and plugging material.

[0029] The self-degradation anti-leakage plugging material precursor obtained by the polymerization reaction of the above-mentioned raw materials in the above ratio under heating and pressure, and then undergoes a granulation step to form a granular self-degradation anti-leakage plugging material with a specific particle size, It has good compressive strength and can withstand strong compressive shearing force; it has excellent plugging performance and can effectively seal the lost zone; at t...

Embodiment 1

[0042] The formula is: tap water 1000kg, acrylic acid monomer 80kg, water-soluble starch 160kg, ammonium persulfate 8kg, KH-570 silane coupling agent 4kg.

[0043] Preparation:

[0044] ①Add 1000kg of water at a temperature of 30°C to a ceramic mixing tank, then add 80kg of acrylic acid, stir evenly, add 160kg of water-soluble starch while stirring, stir for 20 minutes, and then add 8kg of ammonium persulfate and 4kg of KH-570 silane coupling agent , continue stirring for 20 minutes.

[0045] ②Pump the above-mentioned stirred raw materials into a stainless steel reaction kettle with a pressure resistance of 0.4Mpa, seal and heat to 70°C, and react for 10 hours.

[0046] ③Extrude the product in the stainless steel reaction kettle, and process it into a granular product with a diameter of 0.5-5mm by using a twin-screw plastic extruder to obtain a finished product.

[0047] During application, the self-degradable anti-leakage plugging agent for workover is mixed into the workov...

Embodiment 2

[0049] The formula is: tap water 1000kg, acrylic acid monomer 120kg, water-soluble starch 160kg, ammonium persulfate 8kg, KH-570 silane coupling agent 4kg.

[0050] Preparation:

[0051] ①Add 1000kg of water at 27°C to the ceramic mixing tank, then add 120kg of acrylic acid, stir evenly, add 160kg of water-soluble starch while stirring, stir for 20 minutes, then add 8kg of ammonium persulfate and 4kg of KH-570 silane coupling agent , continue stirring for 20 minutes.

[0052] ②Pump the above-mentioned stirred raw materials into a stainless steel reaction kettle with a pressure resistance of 0.4Mpa, seal and heat to 70°C, and react for 10 hours.

[0053] ③Extrude the product in the stainless steel reaction kettle, and process it into a granular product with a diameter of 0.5-5mm by using a twin-screw plastic extruder to obtain a finished product.

[0054] During application, the self-degradable anti-leakage plugging agent for workover is mixed into the workover fluid, and inj...

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Abstract

The invention provides a self-degradable leaking-prevention and stoppage material and a preparation method thereof, a self-degradable leaking-prevention and stoppage product and an application thereof. The self-degradable leaking-prevention and stoppage material comprises the following raw materials in mass by part: 95-105 parts of water, 6-20 parts of an acrylic acid monomer, 12-20 parts of water-soluble starch, 0.5-1.0 parts of persulfate, and 0.2-0.5 parts of a silane coupling agent. In the above raw materials, the acrylic acid monomer is taken as a polymeric monomer, sulfate is taken as an initiator for initiating polymerization of acrylic acid, a silane coupling agent is used for coupling water-soluble starch and the acrylic acid monomer, at the same time, by controlling the usage amount of the raw materials in the above ratio scope, synergism between raw materials is optimized, and the self-degradable leaking-prevention and stoppage material has excellent permeability restoration ratio and self-degradation performance.

Description

technical field [0001] The invention relates to the field of petroleum exploration, in particular to a self-degradation anti-leakage plugging material and a preparation method thereof, a self-degradation anti-leakage plugging product and applications thereof. Background technique [0002] At present, most of the onshore oil fields in my country have entered the middle and later stages of development, and the pressure of oil and gas wells has been decreasing year by year, and the leakage of workover fluid often occurs, which leads to the following consequences: ①The working cycle of the workover fluid cannot be established, and the workover operation cannot be carried out normally; ② The workover time is prolonged and the workover cost is increased; ③The sand washing is not complete, and the oil well operation cycle is short; ④The liquid drainage time is long after the well is opened, and the production recovery rate is low. [0003] At present, there are mainly the following ...

Claims

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Application Information

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IPC IPC(8): C08F251/00C08F220/06C09K8/42
Inventor 胡成亮何丕祥王兴伟宋玉文韩项勇熊英陈建光李倩饶富培季庆荣
Owner PETROCHINA CO LTD
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