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Liquid compatible with formation water and brine workover fluid and preparation method thereof

A workover fluid and formation water technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of reservoir damage, wellbore scaling, etc., and meet the requirements of on-site construction, good fluidity, and low cost Effect

Active Publication Date: 2020-11-24
CNPC BOHAI DRILLING ENG +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 to overcome the incompatibility with formation water in brine workover fluids such as calcium chloride in the prior art, causing reservoir damage to wellbore scaling and other defects, and to provide a kind of workover fluid that can be used with formation water and brine workover fluid Simultaneously compatible liquid and preparation method thereof

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Raw materials (both commercially available products): fresh water 95%, potassium formate 3%, tetrasodium edetate 2%. The above raw materials are uniformly mixed to prepare a liquid compatible with formation water and brine workover fluid at the same time. The liquid is a colorless or light yellow free-flowing liquid, with a pH value between 6 and 7, and a density of 1.010 g / cm3 measured by a Pomeranian density meter. 3 . Take 200mL of the workover fluid, put it in a 400mL Erlenmeyer flask with a stopper, and place it at normal temperature and pressure for 2 months, and at medium temperature (95°C) for 6 hours. The liquid in the bottle has no precipitation and is clear. As before, it shows that the compatibility of the liquid system is good. The workover fluid was mixed with formation water of Well Ban 5-3 in Dagang Oilfield, formation water of Nv K51-30, 1.18g / cm 3 Sodium chloride brine workover fluid, 1.35g / cm 3 calcium chloride, 1.58g / cm 3 The zinc chloride brine...

Embodiment 2

[0039] Fresh water 80%, potassium formate 3%, tetrasodium edetate 2%, sodium formate 15%. The above raw materials are uniformly mixed to prepare a liquid compatible with formation water and brine workover fluid at the same time. The liquid is a colorless or light yellow free-flowing liquid with a pH value between 6 and 7 and a density of 1.103 g / cm3 measured by a Pomerol density meter 3 . Take 200mL of the workover fluid, put it in a 400mL Erlenmeyer flask with a stopper, and place it at normal temperature and pressure for 2 months, and at medium temperature (95°C) for 6 hours. The liquid in the bottle has no precipitation and is clear. As before, it shows that the compatibility of the liquid system is good. The workover fluid was mixed with formation water of Well Ban 5-3 in Dagang Oilfield, formation water of Nv K51-30, 1.18g / cm 3 Sodium chloride brine workover fluid, 1.35g / cm 3 calcium chloride, 1.58g / cm 3 The zinc chloride brine workover fluid is mixed evenly at a rat...

Embodiment 3

[0041] Fresh water 66%, potassium formate 3%, tetrasodium edetate 2%, sodium formate 29%. The above raw materials are uniformly mixed to prepare a liquid compatible with formation water and brine workover fluid at the same time. The liquid is a colorless or light yellow free-flowing liquid, with a pH value between 6 and 7, and a density of 1.150 g / cm measured by a Pomeranian density meter 3 . Take 200mL of the workover fluid, put it in a 400mL Erlenmeyer flask with a stopper, and place it at normal temperature and pressure for 2 months, and at medium temperature (95°C) for 6 hours. The liquid in the bottle has no precipitation and is clear. As before, it shows that the compatibility of the liquid system is good. The workover fluid was mixed with formation water of Well Ban 5-3 in Dagang Oilfield, formation water of Nv K51-30, 1.18g / cm 3 Sodium chloride brine workover fluid, 1.35g / cm 3 calcium chloride, 1.58g / cm 3 The zinc chloride brine workover fluid is mixed evenly at a...

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Abstract

The invention discloses a liquid capable of being simultaneously compounded with surface water and brine workover fluid and a preparation method thereof. The liquid is prepared from the following components in percentage by mass: 0 to 29% of weighting agent (sodium formate), 3% of antiswelling agent (potassium formate), 2% of chelating agent (ethylenediamine tetraacetic acid tetrasodium salt), andthe balance of fresh water, wherein the density of the liquid is 1.01 to 1.15g / m<3>. The liquid is compounded with the heavy sodium carbonate and calcium chloride surface water, and is also compounded with the workover fluid prepared from sodium chloride, calcium chloride and zinc chloride. The liquid has the advantages that the cost is low, the injury is weak, the pollution is avoided, the solidphase is avoided, the fluidity is good, and the like; the site construction requirements can be met.

Description

technical field [0001] The invention relates to the field of downhole workover operations in oil fields, in particular to a liquid compatible with formation water and brine workover fluid and a preparation method thereof. Background technique [0002] In the stage of oilfield exploration and development, oil, gas and water wells need to carry out oil testing and workover operations. Workover hydraulic wells are often used to carry out operations in the wellbore. In order to reduce the cost of workover fluids, it is generally necessary to inject low-cost brine workover fluid into the wellbore , may cause damage to the reservoir. In order to protect the reservoir from contamination, a liquid that is compatible with both formation water and low-cost brine workover fluid is needed as formation water and low-cost brine workover fluid in the wellbore The spacer fluid inside, through the isolation effect of the liquid, achieves the purpose of normal use of low-cost brine workover h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/506C09K8/06C09K8/86
CPCC09K8/06C09K8/506C09K8/86
Inventor 何风华刘德正张建华李春宁曹雅坤胡庆余刘晓旭
Owner CNPC BOHAI DRILLING ENG
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