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Using Formation Temperature to Generate Fluid Gel for Isolation Valves to Seal Gas Formation

A formation temperature, gel technology, applied in the directions of sealing/isolation, drilling composition, wellbore/well components, etc., can solve the problems of uneven gel, high gel cost, easy dehydration, etc., to achieve water retention Good performance, conducive to stability, simple formula effect

Active Publication Date: 2016-08-17
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1. The existing gel formula is relatively complicated, the gel cost is high, and the pressure resistance and sealing are not enough;
[0007] 2. The existing gel formula has poor water retention performance after being gelled, and lacks better water retention monomers in the gel;
[0008] 3. The cross-linking agent only uses potassium persulfate or ammonium persulfate, which belongs to the water-soluble inorganic peroxygen gel initiator. This type of initiator is greatly affected by temperature, that is, the reaction must be initiated at a certain temperature and the reaction is easy to occur. Inhomogeneous gel, local dehydration

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] As the best embodiment of the present invention, its components and proportioning are as follows:

[0035] Gel cross-linking system: 20;

[0036] gel initiator: 1;

[0037] Wherein, the gel crosslinking system is composed of water, initiating monomer and crosslinking monomer;

[0038] Based on the total mass percentage of the fluid gel, the initiator monomer accounts for 2-15%, the cross-linking monomer accounts for 0.1-5%, the gel initiator accounts for 0.1-2%, and the rest is water.

[0039] The initiator monomer adopts acrylamide, which is mixed with N-methylolacrylamide, sodium acrylate, sodium allylsulfonate, acryloyloxyethyltrimethylammonium chloride and dimethyldiallyl chloride respectively. One or more than two ammonium chlorides in any proportion.

[0040] The cross-linking monomer refers to N,N'-methylenebisacrylamide.

[0041] The gel initiator is selected from one of the following gel initiator systems mixed in any proportion: 1) water-soluble azo gel in...

Embodiment 2

[0059] As another preferred embodiment of the present invention, its components and proportioning ratio are:

[0060] With 6% of acrylamide and 2% of sodium acrylate, and 0.5% of N,N'-methylenebisacrylamide, using 1% of gel initiator azobis(dimimidylpropane) dihydrochloride (V44), The rest is water. At 70°C, after 30 minutes, the gelling viscosity is 30,000mPa.s. After gelling in a 5-inch casing, the maximum plugging pressure is 2.5MPa / 100m. All the other are with embodiment 1.

Embodiment 3

[0062] As another preferred embodiment of the present invention, its components and proportioning ratio are:

[0063] Acrylamide 8% and acryloyloxyethyltrimethylammonium chloride 2%, and N,N'-methylenebisacrylamide 0.5%, using water-soluble oxidation-reduction gel initiator potassium persulfate 0.4% and Sodium bisulfite is 0.2%, and the rest is water. At 40°C, after 40 minutes, the gelling viscosity is 20,000mPa.s. After gelling in a 5-inch casing, the maximum plugging pressure is 2.4MPa / 100m. All the other are with embodiment 1.

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PUM

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Abstract

The invention discloses fluid gel for generating seal valve plugging air layers by virtue of formation temperature. The fluid gel is composed of the following ingredients in parts by weight: 10-30 parts of gel crosslinking system and 1 part of gel initiator, wherein the gel crosslinking system is composed of water, an initiator monomer and a crosslinking monomer; and counted by the total mass percentage of the fluid gel, the initiator monomer accounts for 2-15%, the crosslinking monomer accounts for 0.1-5%, the gel initiator accounts for 0.1-2%, and the balance is water. The fluid gel disclosed by the invention is simple in formula, low in cost and high in pressure resistance.

Description

technical field [0001] The invention relates to a fluid for sealing off oil and gas layers by using formation temperature to form a gel sealing valve, especially suitable for oil and gas reservoirs as a casing valve to form an isolation area between the reservoir and the ground, which is convenient for low-pressure operations such as well head disassembly and assembly. . Background technique [0002] In the process of wellhead construction in medium and low pressure reservoirs, in order to prevent formation fluids (oil, gas, water) from gushing out of the wellhead and cause danger, mechanical packers are often lowered and installed in the wellbore at a certain depth, between the wellbore and the surface. Form a blockage between them, which is convenient for wellhead construction operations. [0003] At present, the price of mechanical casing valves used is relatively high, and the equipment is mainly imported. The domestic research and development is still in the promotion ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/06C08F222/38C08F220/34C08F220/58C08F228/02C08F4/40E21B33/12C09K8/44
Inventor 罗陶涛陈俊斌欧阳伟陶怀志肖怡李巍袁志平
Owner BC P INC CHINA NAT PETROLEUM CORP
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