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Adsorption type retarded acid and preparation method thereof

A slow-acid and adsorption-type technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of fast acid-rock reaction speed, reduced acid-rock reaction speed, and high cost, so as to delay the reaction time and reduce the Acid fluid loss and easy injection effect

Inactive Publication Date: 2018-10-12
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

Thickened acid is mainly by increasing the viscosity of the acid liquid and reducing the H + Diffusion speed, so as to achieve the purpose of reducing the reaction speed of acid rock; turning to acid needs to add a large amount of surfactant, the cost is high, and the temperature resistance is weak; the viscosity of the cross-linked acid system is too high, the pumping is difficult, and the construction quality is affected
In the ordinary acidizing process, the filtration loss is serious, it is difficult to form deep-penetrating acid-etched fractures, the flowback is not complete, and the secondary damage to the formation is relatively large, especially for limestone dolomite, the acid-rock reaction speed is fast and the effective action distance is short. It is difficult to achieve the purpose of deep transformation
[0003] At present, there are few domestic research and application reports on cationic polymer adsorption acid system, so the development and application of cationic adsorption acid system has a good application prospect

Method used

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  • Adsorption type retarded acid and preparation method thereof
  • Adsorption type retarded acid and preparation method thereof
  • Adsorption type retarded acid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] An adsorption type retarded acid is composed of the following raw materials in parts by weight:

[0036] Retarder: 1.0 to 1.5 parts;

[0037] Corrosion inhibitor: 1.2 to 1.5 parts;

[0038] Iron ion stabilizer: 1.0~1.2 parts;

[0039] Drainage aid: 0.3 to 0.5 parts;

[0040] Foaming agent: 0.3 to 0.5 parts;

[0041] Hydrochloric acid: 100 parts.

[0042] The adsorption-type retarding acid described in the present invention is adsorbed on the rock surface through functional groups, delays the reaction time of acid rock, increases the length of acid-etched cracks and the degree of non-uniform etching, and has obvious retarding effect, and no secondary damage to the formation will be caused after the reaction is completed , can form effective cracks. The adsorption-type retarded acid is mainly used for the acidification reformation of carbonate rock reservoirs in gas wells, especially for the transformation of limestone dolomite.

Embodiment 2

[0044] On the basis of Example 1, the retarder is made of the following raw materials in parts by weight: 5-6 parts of acrylamide, 0.1-0.15 parts of allyl polyoxyethylene ether, 0.1 parts of sodium styrene sulfonate ~0.15 parts and 3~3.5 parts of cationic monomers, wherein the cationic monomers are hexadecyldimethylallyl ammonium chloride or triethylmethylammonium chloride; the retarder has good adsorption The effect is to delay the acid-rock reaction rate.

[0045] The corrosion inhibitor is made from the following raw materials in parts by weight: 6-8 parts of benzyl quinoline chloride, 1-1.5 parts of acetylenic alcohol and 1-2 parts of Mannich base; the iron ion stabilizer is Alcohol ether carboxylic acid or citric acid. The corrosion inhibitor and the iron ion stabilizer have good anti-corrosion effect and can effectively reduce the corrosion rate of the oil pipe;

[0046] The drainage aid is a fluorocarbon surfactant lauryl alcohol polyvinyl ether or cocamide propylene ...

Embodiment 3

[0049] On the basis of the above examples, the preparation method of the adsorption-type retarded acid includes the following steps: dilute the hydrochloric acid to a concentration of 15-25%, add the retarder according to the proportion, fully stir, place for 2-4h, and then After adding corrosion inhibitor, iron ion stabilizer, drainage aid and foaming agent and fully stirring, let stand for use.

[0050] During the acid-rock reaction process of the adsorption type acid liquid, the functional groups are adsorbed on the rock surface, and the hydrophobic chain forms a protective film to isolate H+ in the acid liquid, delay the acid-rock reaction time, increase the length of acid-etched fractures and the degree of non-uniform etching, and increase the conductivity of fractures. flow capacity, can effectively increase the gas production of a single well, and has a good application prospect.

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Abstract

The invention provides an adsorption type retarded acid and a preparation method thereof. The adsorption type retarded acid is prepared from, by weight, 1.0-1.5 parts of retarding agent, 1.2-1.5 partsof corrosion inhibitor, 10-1.2 parts of iron ion stabilizer, 0.3-0.5 part of cleanup additive, 0.3-0.5 part of foaming agent and 100 parts of hydrochloric acid. The adsorption type retarded acid is adsorbed on the surface of rock through functional groups, the reaction time of the acidic rock is delayed, the acid corrosion crack length and the non-uniform etching degree are increased, the retarding effect is obvious, the reservoir reform effect is remarkable, and application and popularization prospects are great.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and in particular relates to an adsorption-type retarded acid and a preparation method thereof. Background technique [0002] Acidizing is one of the main technological measures for stabilizing and increasing production of oil and gas wells. During the acidizing process, the effectiveness of increasing production is greatly reduced due to the fast reaction speed of acid rock and the short penetration distance. With the development of acidizing technology, the effective length of acid-etched fractures and the conductivity of fractures after acidizing treatment have become the key to acidizing reservoir stimulation. How to effectively increase the acidizing radius has become a difficult problem to be solved in acidizing technology. The currently used acidizing stimulation acid systems in the lower paleo-carbonate reservoirs of the Changqing gas field mainly include: thickening acid, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/74C09K8/68
CPCC09K8/665C09K8/68C09K8/725C09K8/74C09K2208/32
Inventor 李泽锋张冕高燕兰建平杨燕邵秀丽王改红姬随波宇文昔涵陈建林
Owner BC P INC CHINA NAT PETROLEUM CORP