oil protection fluid

A technology of oil layer protection fluid and mass fraction, which is applied in the directions of drilling compositions, chemical instruments and methods, etc., can solve the problems of long production recovery period and low recovery rate, and achieve the effect of small overall damage.

Active Publication Date: 2016-06-08
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is to provide an oil reservoir protection fluid, which can solve the various damages caused by the workover fluid to the reservoir during the workover operation of oil and water wells, resulting in Long production recovery period and low recovery rate, while improving the environmental friendliness of the workover fluid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Prepare the raw materials in the following proportions:

[0024] 30 tons of clear water, 90 kg of hydroxypropyl guar gum, 450 kg of hydroxypropyl starch, 900 kg of cetyltrimethyl ammonium chloride, 15 kg of nonylphenol polyoxyethylene ether, and 3 kg of 1427 cationic surfactant.

[0025] The production method is as follows:

[0026] First, add nonylphenol polyoxyethylene ether (surfactant) and 1427 cationic surfactant (bactericide) to clean water, stir for 10 minutes to prepare a base liquid, and then mix hydroxypropyl guar gum (tackifier), hydroxyl Propyl starch (fluid loss reducer) and cetyltrimethylammonium chloride (anti-swelling agent) are prepared into a uniform solid mixture in proportion, and this solid mixture is added to the base liquid while stirring, and stirred and dissolved for 2 hours .

[0027] The above-mentioned oil layer protection fluid was used for pump inspection, and the production recovery period after the operation was shortened by 4 days.

Embodiment 2

[0029] Prepare the raw materials in the following proportions:

[0030] 40 tons of clear water, 160kg of hydroxypropyl guar gum, 800kg of hydroxypropyl starch, 1200kg of cetyltrimethyl ammonium chloride, 12kg of nonylphenol polyoxyethylene ether, and 4kg of 1427 cationic surfactant.

[0031] The production method is as follows:

[0032] First, add nonylphenol polyoxyethylene ether (surfactant) and 1427 cationic surfactant (bactericide) to clean water, stir for 10 minutes to prepare a base liquid, and then mix hydroxypropyl guar gum (tackifier), hydroxyl Propyl starch (fluid loss reducer) and cetyl trimethyl ammonium chloride (anti-swelling agent) are prepared into a uniform solid mixture in proportion, and this solid mixture is added to the base liquid while stirring, and stirred and dissolved for 3 hours .

[0033] The above-mentioned oil layer protection fluid was used in the pump inspection and sand flushing operation of Well D6-15K. The drainage period after the operatio...

Embodiment 3

[0035] Prepare the raw materials in the following proportions:

[0036] 30 tons of clear water, 120kg of hydroxypropyl guar gum, 300kg of hydroxypropyl starch, 900kg of cetyltrimethyl ammonium chloride, 15kg of nonylphenol polyoxyethylene ether, and 3kg of 1427 cationic surfactant.

[0037] The production method is as follows:

[0038] First, add nonylphenol polyoxyethylene ether (surfactant) and 1427 cationic surfactant (bactericide) to clean water, stir for 10 minutes to prepare a base liquid, and then mix hydroxypropyl guar gum (tackifier), hydroxyl Propyl starch (fluid loss reducer) and cetyl trimethyl ammonium chloride (anti-swelling agent) are prepared into a uniform solid mixture in proportion, and this solid mixture is added to the base liquid while stirring, and stirred and dissolved for 3 hours .

[0039] The above oil layer protection fluid is used for electric transfer pumping and sand washing operations, and the daily fluid production increases by 4m after the o...

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PUM

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Abstract

The invention discloses an oil layer protective solution, which is composed of water, a tackifier, a filtrate reducer, an anti-swelling agent, a surfactant, and a bactericide. The protective solution utilizes a synergetic effect of the chemical agents mentioned above so as to realize multiple protective functions on oil layer. The preparation method of the oil layer protective solution comprises the following steps: adding a surfactant and a bactericide into clean water, stirring so as to prepare a basic solution; mixing a tackifier, a filtrate reducer, and an anti-swelling agent according to a ratio so as to make into a uniform solid mixture, then adding the solid mixture into the basic solution with stirring, and stirring to dissolve the mixture so as to form the finished product. The protective solution is used during the process of workover operations such as well killing, well washing, sand washing, pump inspecting, electricity inspecting, electricity to pumping transferring, pumping to electricity transferring, blowing to pumping transferring, blowing to electricity transferring, pump upgrading, and pump depth deepening to protect the oil reservoir so as to prevent the oil reservoir from damages caused by workover fluid.

Description

technical field [0001] The invention relates to an oil layer protection fluid used in the oilfield development workover operation process. Background technique [0002] Well workover is the work of removing faults and improving wellbore conditions to restore normal production of oil and gas wells. Its purpose is to relieve the downhole accident, maintain the wellbore, improve the oil production conditions of the oil and gas well, and restore the oil production capacity of the oil well. It is an important measure to improve the single well production and recovery rate and prolong the production cycle. It is also an important means to tap the potential of old wells, discover new horizons, and expand exploration results. As oil and gas fields enter the middle and late stages of development, workover has become an important and frequent task. [0003] At present, the workover fluids used in domestic oilfields mainly include 6 types of systems, such as treated crude oil deioniz...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/52C09K8/58
CPCC09K8/52C09K8/58
Inventor 胡成亮熊英李倩宋玉文韩项勇王兴伟饶富培陈建光何丕祥季庆荣
Owner PETROCHINA CO LTD
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