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Weak acid acidizing fluid for water injection well with non-moving string and preparation method thereof

A technology for acidizing fluid and water injection well, which is applied in the directions of chemical instruments and methods, drilling composition, etc., can solve the problems of affecting the energy replenishment of oil production wells, delaying construction time, and multi-manpower and material resources, so as to delay secondary scaling. The effect of plugging, increasing injection volume and reducing displacement pressure

Active Publication Date: 2016-02-17
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

Pressure relief and construction time delay will affect the energy supplement of the corresponding production wells
Periodic lifting and lowering of pipe strings during construction requires a lot of manpower and material resources

Method used

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  • Weak acid acidizing fluid for water injection well with non-moving string and preparation method thereof
  • Weak acid acidizing fluid for water injection well with non-moving string and preparation method thereof
  • Weak acid acidizing fluid for water injection well with non-moving string and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The invention discloses a weak-acid acidification liquid formula for a non-moving pipe string for water injection wells, which comprises the following component proportions by weight percentage: acid liquid: 10-30%; stabilizer: 2-8%; corrosion inhibitor: 1~5%; surfactant: 6.5~17%; the rest is distilled water.

[0041] The weak acid acidification solution can be prepared by conventional heating and stirring method in this field.

Embodiment 2

[0043]On the basis of Example 1, a more preferred embodiment of the present invention is: the acid solution is one or more of succinic acid and (PBTCA, HPAA, BHMTPMPA, HDTMPA), wherein the weight percentage of succinic acid is 5~10%, (PBTCA, HPAA, BHMTPMPA, HDTMPA) one or several weight total percentages are 5~20%, (PBTCA, HPAA, BHMTPMPA, HDTMPA) are all produced by Shandong Taihe Water Treatment Co., Ltd. The stabilizer is citric acid and ascorbic acid, wherein the weight percentage of citric acid is 1-3%; the weight percentage of ascorbic acid is 1-5%. The corrosion inhibitor is propynol, and its weight percentage is 1-5%. The surfactants are alcohol ether carboxylic acid (AEC-9), octylphenol polyoxyethylene ether and fluorocarbon surfactant, wherein the weight percentage of alcohol ether carboxylic acid (AEC-9) is 5-10%, The weight percentage of octylphenol polyoxyethylene ether is 1-5%, and the weight percentage of fluorocarbon surfactant is 0.5-2%. The fluorocarbon surfa...

Embodiment 3

[0045] Material preparation, based on the weight percentage of the weak acid acidification solution, each component is prepared according to the following weight: succinic acid: 5~10%; alcohol ether carboxylic acid (AEC-9): 5~10%; citric acid: 1~3% %; ascorbic acid: 1~5%; propynyl alcohol: 1~5%, fluorocarbon surfactant: 0.5~2%, octylphenol ethoxylate: 1~5%; (PBTCA, HPAA, BHMTPMPA, HDTMPA ) in one or more: 5~20%; the rest is distilled water.

[0046] First add all the distilled water into the reaction kettle, and raise the temperature to 50-55°C; then, add all the succinic acid and one or more of (PBTCA, HPAA, BHMTPMPA, HDTMPA), and stir for 20-30 minutes; then, add All the citric acid and ascorbic acid, stir for 20-30 minutes; then, add all the propynyl alcohol, stir for 15-20 minutes; finally, add all the alcohol ether carboxylic acid (AEC-9), fluorocarbon surfactant and octylphenol Polyoxyethylene ether, stirred for 20 to 30 minutes, to produce a weak acid acidification liq...

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Abstract

The invention discloses an immovable pipe column weak acid acidizing fluid for a water injection well, and relates to the technical field of injection well acidizing fluid formulas and injection well acidizing fluid preparation methods. The immovable pipe column weak acid acidizing fluid comprises the following components in percentage by weight: 10%-30% of acid liquor, 2%-8% of stabilizing agents, 1%-5% of corrosion inhibitors, 6.5%-17% of surface active agents and the balance of distilled water. The invention also provides a preparation method of the immovable pipe column weak acid acidizing fluid for the water injection well. The immovable pipe column weak acid acidizing fluid disclosed by the invention can enlarge the acidifying blocking removal radius of the water injection well, relieve the scaling near the well bore of the water injection well, prolong the effective period of the water injection well, realize the continuous mixing acidification of an immovable pipe column and simplify the construction procedure and not influence the normal production of the water injection well by synchronously carrying out water injection and acidification.

Description

technical field [0001] The present invention relates to the technical field of water injection well acidizing fluid formula and its preparation method, in particular to a method for acidizing water injection wells in sandstone reservoirs in low-permeability oilfields to reduce pressure and increase injection. The formulation and preparation method of the weak acid acidification solution which does not affect normal production is carried out simultaneously with acidification and water injection. Background technique [0002] With the development of domestic exploration and development, more and more sandstone reservoirs in low-permeability oilfields are gradually appearing. During the development of low-permeability oilfields, water injection can be used to increase recovery with the attenuation of formation energy. However, during the production of water injection wells, due to The incompatibility of injected water and formation water will slowly scale in the wellbore of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/74C09K8/528
CPCC09K8/602C09K8/74C09K8/885C09K2208/32
Inventor 任雁鹏蒋文学李勇徐洋付振银马托何举涛安全成范杰汪小宇武龙周然金娜荆建春王玉功柴巧玲陈迎花
Owner BC P INC CHINA NAT PETROLEUM CORP
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