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High-strength controllable gelout chemical temporary plugging liquid rubber stopper

A high-strength, gel-breaking technology, applied to chemical instruments and methods, wellbore/well components, drilling compositions, etc., to achieve simple construction, strong compression resistance, and fast gel-breaking effects

Active Publication Date: 2011-05-18
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the previous technology, "liquid rubber plugging agent" (CN1182112A), "anti-high temperature well completion temporary plugging agent" (CN1047686A) is to use the safflower gum and guar gum powder in the vegetable gum as raw materials, and adopt tetrachloride Titanium and potassium dichromate are cross-linking agents, and the strength is increased by filling sand during construction, and they can only be used as temporary plugging agents in vertical wells

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] At 30°C, the weight ratio of each component to water: STP-2:: acrylamide: methacryloyloxyethyltrimethylammonium chloride (DMC): NN-methylenebisacrylamide: persulfuric acid Potassium: sodium sulfite: water = 0.6:10:1:0.05:0.05:0.05:89.

[0017] Preparation of base liquid: add 0.6% STP-2 to the stirred water, stir for 15 minutes, then add 10% acrylamide, 0.1% methacryloyloxyethyltrimethylammonium chloride, stir well and let it stand for swelling for 4 hours. Liquid viscosity 15mpa.s.

[0018] Preparation of cross-linking solution: add 1% NN-dimethylacrylamide to water, stir evenly and let it dissolve.

[0019] Initiator solution preparation: add 10% sodium persulfate to water, stir evenly and let it dissolve.

[0020] Preparation of oxygen scavenger solution: add 1% sodium sulfite to water, stir evenly and let it dissolve.

[0021] Liquid rubber stopper preparation: Add 5ml of cross-linking solution, 5ml of initiator solution, and 5ml of oxygen scavenger solution into ...

Embodiment 2

[0023] At 30°C, the weight ratio of each component to water: STP-2:: sodium acrylate: dimethyl diallyl ammonium chloride: NN-dimethylacrylamide: sodium persulfate: sodium sulfite: water = 0.8 :10:1:0.03:0.05:0.05:89.

[0024] Preparation of base liquid: Add 882g of clean water to a 1500ml mixer cup, add 8g of STP-2 at a speed of 100 rpm, stir for 15min, then add 100g of sodium acrylate, and then add 10g of methacryloyloxyethyl Trimethylammonium chloride, stirred evenly, poured into a 1000ml beaker and left to swell for 4 hours, the liquid viscosity was 36mpa.s.

[0025] Preparation of crosslinking solution: In a 100ml beaker, add 1g of NN-dimethylacrylamide, stir evenly and let it dissolve.

[0026] Initiator preparation: In a 50ml beaker, add 5g of sodium persulfate, stir evenly and let it dissolve.

[0027] Preparation of oxygen scavenger: In a 100ml beaker, add 1g of sodium sulfite, stir evenly and let it dissolve.

[0028] Preparation of liquid rubber stopper: add 3ml o...

Embodiment 3

[0030] At 30°C, the weight ratio of each component to water: STP-2:: acrylamide: acrylic acid: NN-methylenebisacrylamide: sodium persulfate: sodium bisulfite: water=0.8:8:1: 0.03:0.03:0.05:90. Liquid viscosity 36mpa.s.

[0031] Base liquid preparation: Add 892g of clean water into a 1500ml mixer cup, add 8g of STP-2 at a speed of 100 rpm, stir for 15min, then add 80g of sodium acrylate and 10g of acrylic acid, stir well and pour into 1000ml Let stand in the beaker to swell for 4 hours.

[0032] Preparation of crosslinking solution: In a 100ml beaker, add 1g of NN-dimethylacrylamide, stir evenly and let it dissolve.

[0033] Initiator solution preparation: In a 50ml beaker, add 5g of sodium persulfate, stir evenly and let it dissolve. .

[0034] Preparation of oxygen scavenger solution: In a 100ml beaker, add 1g of sodium sulfite, stir evenly and let it dissolve.

[0035] Preparation of liquid rubber stopper: add 3ml of cross-linking solution, 3ml of initiator solution, an...

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Abstract

The invention relates to a high-strength controllable gelout chemical temporary plugging liquid rubber stopper. The rubber stopper is characterized by being prepared from the following components in percentage by weight by carrying out solution crosslinking polymerization in water: 0.3-1 percent of amphoteric polyacrylamide, 6-12 percent of cationic monomer, 1-5 percent of anionic monomer, 0.02-0.06 percent of cross-linking agent, 0.02-0.06 percent of initiator and 81.9-93 percent of water. The liquid rubber stopper can be resistant to a temperature of 60 DEG C, the rubber forming time is adjustable in 2-50min, and the rubber stopper can bear fracture construction differential pressure higher than 15MPa and can be used for replacing a mechanical packer to effectively plug a target layer and then carry out conventional fracture construction and controlling gelout hydrating within required time.

Description

technical field [0001] The invention relates to a high-strength controllable gel-breaking chemical temporary plugging liquid rubber plug that can replace a mechanical packer and play the role of bridge plugging in staged fracturing operations of horizontal wells. Background technique [0002] In the staged fracturing of horizontal wells, some wells cannot be isolated with mechanical packers because the perforated well section is too long or the interval between oil and gas producing layers is too small, and because of the special structure of the well section, the mechanical packer cannot Target formations are isolated, and these wells cannot complete staged fracturing. A high-strength controllable gel-breaking chemical temporary plugging liquid plug used for staged fracturing of horizontal wells can replace mechanical packers to accurately seal the target layer. Gel breaking provides a new chemical temporary plugging method for horizontal well stimulation. [0003] In the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/42E21B33/134
Inventor 邱晓惠崔明月胥云丁云宏王振铎管宝山刘萍杨艳丽梁丽
Owner PETROCHINA CO LTD
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