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Method for water drainage and gas recovery of ultra-deep gas well by adopting solid foam water drainage agent composition

A foam drainage agent, water drainage and gas recovery technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of poor high temperature resistance, production reduction or even stop spraying liquid foam drainage agent and difficulty in filling

Active Publication Date: 2019-04-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the existing foam drainage agent has poor high temperature resistance in acidic environment, and cannot solve the problems of production reduction or even stop spraying and difficulty in filling liquid foam drainage agent due to fluid accumulation in high temperature ultra-deep gas wells. A method for drainage and gas recovery of ultra-deep gas wells using a solid foam drainage agent composition, which is applied to high-temperature deep wells and has very good temperature resistance under acidic conditions, and has strong liquid-carrying, foaming and foam-stabilizing properties

Method used

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  • Method for water drainage and gas recovery of ultra-deep gas well by adopting solid foam water drainage agent composition
  • Method for water drainage and gas recovery of ultra-deep gas well by adopting solid foam water drainage agent composition
  • Method for water drainage and gas recovery of ultra-deep gas well by adopting solid foam water drainage agent composition

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] (1) Preparation of foaming agent FMG01

[0081] a. Add 127.6 grams (0.55 moles) of pentaethylenehexamine and 1.4 grams (0.025 moles) of potassium hydroxide solid in the reaction flask equipped with mechanical stirring, thermometer, dropping funnel and atmospheric distillation device, and slowly drop them under stirring Add 148 grams (0.5 moles) of methyl oleate, react at a reaction temperature of 120 to 160°C for 6 hours, and collect the methanol generated by the reaction at the same time to obtain the desired amide compound C 17 h 33 CO(NHCH 2 CH 2 ) 5 NH 2 , yield 93.8%.

[0082] b. After removing the water in the three-necked flask device equipped with a reflux condenser, a dropping funnel, and a thermometer, add 11.4 grams (0.3 moles) of lithium aluminum hydride and 90 milliliters of dry dioxane, stir, disperse and mix, and then - Add 49.6 grams (0.1 moles) of C 17 h 33 CO(NHCH 2 CH 2 ) 5 NH 2 40wt% dioxane solution, after the dropwise addition, the temp...

Embodiment 2

[0089] Same as [Example 1], the difference is that when measuring the performance of FMG01, the pH is adjusted to 7, 4 and 2 with hydrochloric acid to simulate neutral and acidic gas environments, and the results are shown in Table 2.

Embodiment 3

[0091] With [Example 1], the difference is that the long-chain polyamine polyether compound 1 (R 1 =C 18 h 35 , m=5, s1+s2+5s3=20, r1+r2+5r3=3) sodium hydroxypropanesulfonate (R 2 , R 3 , R 4 One of them is CH 2 CH(OH)CH 2 SO 3Na, the rest is H) 50 grams, C 16 h 33 OC 2 h 4 N + (CH 3 ) 3 Br - 50 grams, 100 grams of sodium sulfate, 50 grams of potassium bicarbonate, 30 grams of sodium borate, and 30 grams of biuret were mixed evenly, and 30 grams of 5% dextrin aqueous solution were added and mixed evenly to obtain a foam drainage rod FMG02. The results are shown in Table 3 Show.

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Abstract

The invention relates to a method for water drainage and gas recovery of an ultra-deep gas well by adopting a solid foam water drainage agent composition. The problems that an existing foam water drainage agent is poor in high temperature and high salt resistance under the acid environment containing H2S and CO2, and production reduction and even blowout stopping and difficult filling of the liquid foam water drainage agent, caused by accumulated liquid, of the high temperature and high salt ultra-deep gas well cannot be solved are mainly solved. The problems are solved well by adopting the technical scheme that the method comprises the following steps: (1) the solid foam water drainage agent composition and water are mixed to obtain a foam water drainage agent solution; and (2) the foam water drainage agent solution or a mixed solution of the foam water drainage agent solution and oil makes full contact with gas to form a foam fluid, and the water or an oil and water mixture is displaced, wherein the solid foam water drainage agent composition is prepared from the following components in parts by mass: 1 part of a polyamine polyether compound shown as the formula (1), 0.01-100 parts of a cosurfactant, 0.05-1000 parts of a solid filler and 0-0.5 part of a binder. The method can be used for water drainage and gas recovery of the acidic high temperature and high salt ultra-deep gas well.

Description

technical field [0001] The invention relates to a method for drainage and gas recovery of an ultra-deep gas well using a solid foam drainage agent composition. Background technique [0002] With the intensification of gas field exploitation, water production from gas fields has become a key issue restricting the normal production of gas wells. Foam drainage gas recovery is a drainage gas recovery technology developed rapidly at home and abroad in recent years. It has the advantages of simple equipment, convenient construction, low cost, wide range of applicable well depths, and does not affect the normal production of gas wells. Foam drainage is to inject foam drainage agent into the well through the tubing or tubing annulus, and generate foam with certain stability under the agitation of the air flow. The liquid phase deposited by slippage in the pipe turns into foam, which changes the relative density of the fluid in the lower part of the pipe, and the continuously produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/588C09K8/584C08G65/26C08G65/332C08G65/334
CPCC08G65/2624C08G65/3322C08G65/3346C09K8/584C09K8/588
Inventor 李应成沈之芹何秀娟马俊伟
Owner CHINA PETROLEUM & CHEM CORP
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