Oil and water well polyacid blocking remover

A technology of blocking remover and polyacid, which is applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of low corrosion rate of acid plugging remover, pollution and blockage in low permeability reservoirs, and save the operation scale. , low cost, easy flowback effect

Inactive Publication Date: 2016-04-13
CHINA NAT OFFSHORE OIL CORP +1
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art, and provide a multi-acid plugging agent for oil and water wells, which can simultaneously solve the problems of loose sandstone reservoir mud and drilling fluid pollution plugging in current oil wells, and acid liquid solution decomposition of low-permeability reservoirs. The plugging agent has low corrosion rate and many other damage problems, and it also has the effect of low corrosion and low dissolution skeleton

Method used

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  • Oil and water well polyacid blocking remover
  • Oil and water well polyacid blocking remover
  • Oil and water well polyacid blocking remover

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] ①Water, 31% industrial hydrochloric acid, 40% fluoroswelling acid, 100% modified silicic acid, 100% anti-swelling agent, 100% iron ion stabilizer, 100% demulsification aid and drainage agent, 100% water damage treatment agent, 100% of the precipitation inhibitor and 100% of the corrosion inhibitor are synthesized as a single product and formulated as a polyacid plugging remover.

[0039] Among them, 31% of industrial hydrochloric acid and 40% of fluoboric acid are conventional chemicals on the market; 100% of modified silicic acid comes from Tianjin Tiancheng Chemical Co., Ltd. or Tianjin Hongping Technology Development Co., Ltd.

[0040] The anti-swelling agent in the additive is ammonium chloride;

[0041] 100% of the iron ion stabilizer in the additive is citric acid;

[0042] The demulsification and drainage aid in the additive is alkyl polyoxyethylene ether;

[0043] 100% of the water damage treatment agent in the additive is fluorocarbon surfactant FC4430;

[0...

Embodiment 2

[0064] Experimental example of polyacid plug-removing agent dissolving on-site argillaceous loose sandstone cuttings:

[0065] Test material: cuttings at 1878m in Well 4 of Haiyang Xijiang 23-1 Oilfield (the average permeability of the oil layer is 460×10 -3 μm 2 , the average porosity is 22.5%; mud is about 15.2-19.6%), such as figure 1 (Schematic diagram of cuttings at 1878m in Well 4 of Xijiang 23-1 Oilfield).

[0066] Evaluation method: According to the method of SY / T5336-2006 "Core Routine Analysis Method", the test cuttings were processed, and about 5g of cuttings were weighed (accuracy: 0.001g), and placed in a reaction cup containing 100ml of acid solution (acid solution reaction cup first Preheat in a water bath at 90° C. for 15 minutes), then seal the cuvette, react in a water bath at 90° C. for 2 hours, and take it out. Pour the filtrate after the reaction into the filter paper on the funnel rack, filter, clean the cuvette, and rinse it with distilled water until t...

Embodiment 3

[0073] Examples of polybasic acid plugging remover dissolving drilling fluid:

[0074] Raw materials for the test: FLOPRO drilling fluid is used in the ocean, and FLOPRO mud is placed in an oven at 105°C for aging to obtain residues.

[0075] Evaluation method: use acid solution and residue to conduct corrosion experiments, weigh about 5g of residue for each sample, and add them to 100mL acid solution system respectively.

[0076] Test conditions: indoor test dissolution time 2 hours, 90 ℃ simulated formation temperature.

[0077] On-site test sample: the polybasic acid plugging agent obtained in Example 1.

[0078] The test results are as follows:

[0079] After reacting in the polybasic acid plugging remover, the color of the overall solution turns dark brown, the viscosity is consistent with water, there is no colloidal insoluble matter, and only a few very fine particles precipitate at the bottom. In order to compare and verify the effect, water is specially added, and i...

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Abstract

The invention relates to an oil and water well polyacid blocking remover. The blocking remover comprises 10-15% of hydrochloric acid, 6-8% of fluoroboric acid, 12-15% of modified silicic acid, 1-2% of anti-swelling agent, 1-2% of an iron ion stabilizer, 1-2% of a demulsifying cleanup additive, 1-2% of a water damage treatment agent, 2-4% of a corrosion inhibitor, 6-8% of a precipitation inhibitor, and the balance of water. Inorganic acids in the blocking remover are hydrochloric acid and fluoroboric acid, and hydrochloric acid can corrode the calcareous components of reservoir; and fluoroboric acid can corrode solid phase components, and has a loose sandstone bonding effect. An organic acid in the blocking remover is modified silicic acid, and can solve organic obstruction in a drilling fluid. The blocking remover can solve the problems of loose sandstone reservoir mud and drilling fluid pollution and obstruction and low corrosion rate of low-permeability reservoir acid solution blocking removers of present oil wells, and also has a low skeleton corrosion effect.

Description

technical field [0001] The invention belongs to the technical field of chemical production increase and injection increase in oil field development, and relates to a multi-acid blocking removal agent for oil and water wells. Background technique [0002] Acidizing of oil and water wells is an effective technical means to increase production and injection in oilfields, but at present, the domestic conventional single acid system is not effective in solving some comprehensive damages. , Solve comprehensive damage, easy flowback, save operation scale and other advantages. [0003] However, there are still many problems in the use of multiple compound acid liquid systems. For example, the composite system composed of inorganic acids has high acid strength, is easy to damage the reservoir framework, and has a high corrosion rate of steel, which is mainly aimed at low-permeability reservoirs; emulsified composite acids are likely to cause oil-water emulsification and difficult fl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/74C09K8/78
CPCC09K8/74C09K8/725C09K8/78C09K8/885C09K2208/12C09K2208/32
Inventor 孙林周际永黄波易飞夏光杨万有黄利平刘春祥
Owner CHINA NAT OFFSHORE OIL CORP
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