Acidification blocking remover applicable to deep volcanic gas reservoir and construction method thereof

A volcanic rock and deep layer technology, which is applied in the field of acidizing plugging remover and its construction in deep volcanic rock gas reservoirs, can solve the problems of ineffective plugging removal, limited effect, and high risk of sand stuck pipe strings, achieve uniform acid distribution, avoid Effect of secondary damage and increase of construction net pressure

Inactive Publication Date: 2017-07-21
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 1. There are limitations in mechanical layered acidizing. For volcanic gas reservoirs with open holes or screen completions, the risk of sand stuck pipe strings is extremely high, and horizontal well construction with open holes or screen completions cannot even be implemented;
[0009] 2. When the slow acidification process is applied to volcanic rock gas reservoirs with strong heterogeneity, the acid liquid mainly enters the high permeability formation, and has limited effect on areas with low permeability and no fractures, and cannot achieve the purpose of effective plugging removal

Method used

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  • Acidification blocking remover applicable to deep volcanic gas reservoir and construction method thereof
  • Acidification blocking remover applicable to deep volcanic gas reservoir and construction method thereof
  • Acidification blocking remover applicable to deep volcanic gas reservoir and construction method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] An acidizing plug-removing agent for deep volcanic rock gas reservoirs, comprising the following components by weight:

[0053] Agent A: 15% Hcl + 2% high temperature corrosion inhibitor + 2.5% active thickener + 1% clay stabilizer + 0.5% iron ion stabilizer + 3% co-surfactant + water.

[0054] Agent B: 15% Hcl + 3% co-surfactant + 2% high temperature corrosion inhibitor + 2.5% active thickener + 3% fluorine salt + 3% retarded acid + 1% clay stabilizer + 0.5% iron ion stabilizer Agent + 3% mutual solvent + water;

[0055] Agent C: 10% Hcl + 1-3% high temperature drainage aid + 2-5% high temperature corrosion inhibitor + 1-3% clay stabilizer + 0.5% iron ion stabilizer + 3% mutual solvent + water;

[0056] Agent D: 2% ammonium chloride + 3% high temperature drainage aid + water;

[0057] The volume ratio of agent A to agent B is 1:2; the volume ratio of agent B to agent C is 4:1; the injection amount of agent D is the volume of the injection pipeline, and the total inject...

Embodiment 2

[0065] An acidizing plug-removing agent for deep volcanic rock gas reservoirs, comprising the following components by weight:

[0066] Agent A: 12% Hcl + 2% high temperature corrosion inhibitor + 1% active thickener + 1% clay stabilizer + 0.5% iron ion stabilizer + 3% co-surfactant + water.

[0067] Agent B: 12% Hcl + 3% co-surfactant + 2% high temperature corrosion inhibitor + 1% active thickener + 3% fluorine salt + 3% retarded acid + 1% clay stabilizer + 0.5% iron ion stabilizer Agent + 3% mutual solvent + water;

[0068] Agent C: 10% Hcl + 1-3% high temperature drainage aid + 2-5% high temperature corrosion inhibitor + 1-3% clay stabilizer + 0.5% iron ion stabilizer + 3% mutual solvent + water;

[0069] Agent D: 2% ammonium chloride + 3% high temperature drainage aid + water;

[0070] The volume ratio of agent A to agent B is 1:2; the volume ratio of agent B to agent C is 4:1; the injection amount of agent D is the volume of the injection pipeline, and the total injectio...

Embodiment 3

[0078] An acidizing plug-removing agent used in deep volcanic rock gas reservoirs, its retardation evaluation experiment is as follows:

[0079] In this experiment, it is evaluated by comparing with soil acid and domestic commonly used fluoboric acid system. The objects of dissolution are all the cuttings of the Yingcheng Formation in the volcanic gas reservoir of a certain gas field.

[0080] The experimental formula is as follows:

[0081] 1# soil acid 12%HCL+3%HF

[0082] 2# Fluoroboric acid 12%HCL+5%HBF 4

[0083] 3# 12% Hcl + 3% sodium salicylate + 2% high temperature corrosion inhibitor + 1% cetyl trimethyl salicylate + 3% ammonium fluoride + 3% citric acid + 1% ammonium chloride + 0.5% Tetrasodium EDTA + 3% Ethylene Glycol Butyl Ether + Water

[0084] Experimental process: The soil acid system has the fastest dissolution rate for volcanic rock powder, followed by the fluoboric acid system, and the slowest is the acidification plugging remover for 3# volcanic rock g...

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Abstract

The invention discloses an acidification blocking remover applicable to a deep volcanic gas reservoir and a construction method thereof. The blocking remover comprises A agent, B agent, C agent and D agent; the volume ratio of A agent and B agent is 1: 2, the volume ratio of B agent and C agent is 4: 1; the injection rate of the D agent is volume of an injection pipeline, and the total injection volume is determined upon the stratum condition. The construction method includes steps of 1), mixing the A agent, B agent, C agent and D agent, and placing the agents in a fluid tank for future use; 2), firstly extruding the A agent in a stratum; 3), extruding the B agent in the stratum; 3), extruding the C agent to the stratum; 4) after full reaction of acid liquid and the matrix, opening a well and flowing back. The acidification blocking remover has the beneficial effects of avoiding risk of blocking a pipe pillar by mechanical layered acidification sand; the performance thereof is obviously better than the domestic common retarding acid; the acid rock reaction rate is effectively reduced, and the acidifying radius is enlarged. By applying the blocking remover, 290, 000 cubic meter/day high-output air flow can be acquired after the acidification construction.

Description

technical field [0001] The invention relates to an acidizing plug-removing agent and a construction method thereof, in particular to an acidizing plug-removing agent suitable for deep volcanic rock gas reservoirs and a construction method thereof. Background technique [0002] At present, during the development of natural gas reservoirs, acidizing has always been one of the main technical means in production stimulation measures. For the purpose of increasing production, the development of volcanic gas reservoirs is no exception. According to the acidification construction of domestic volcanic gas reservoirs over the years, the main difficulties include the following aspects: [0003] Firstly, due to the deep burial of volcanic rock gas reservoirs and high reservoir temperature, the acid rock reaction speed is too fast during acidizing construction, the acidizing radius is reduced, and the production stimulation effect is reduced; A large amount of fluid is lost along the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/524C09K8/528E21B37/06
CPCC09K8/524C09K8/528C09K2208/32E21B37/06
Inventor 宋宪实张冲李晓东夏富国巢贵业周小林缪明铭索佰峰高春华
Owner CHINA PETROLEUM & CHEM CORP
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