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Preparation method of composite ground crosslinking acid controllable in crosslinking time

A technology of crosslinking time and composite crosslinking agent, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of uncontrollable crosslinking time and achieve controllability, strong sand-carrying ability, good The effect of heat resistance

Inactive Publication Date: 2017-11-03
滨州市丰泰技术开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention mainly aims at the disadvantage that the cross-linking time of the existing cross-linking acid liquid system is uncontrollable, and provides a compound acid liquid system with controllable cross-linking time and temperature resistance and its preparation method, which solves the problem of acidic acid in conventional acid fracturing. The shortcomings of underground cross-linking and uncontrollable cross-linking time in the liquid system, the present invention mainly uses two kinds of cross-linking agents and cross-linking conditioners with different properties, and controls the cross-linking time of the acid liquid system by adjusting the ratio. At the same time, due to the The introduction of organic resin improves the temperature resistance of the acid system

Method used

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  • Preparation method of composite ground crosslinking acid controllable in crosslinking time
  • Preparation method of composite ground crosslinking acid controllable in crosslinking time
  • Preparation method of composite ground crosslinking acid controllable in crosslinking time

Examples

Experimental program
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Effect test

Embodiment 1

[0055]This example is the Bin 105-17 well in the Bin 105 block of the Shengli Oilfield. -3 μm 2 , average permeability 62×10 -3 μm 2 , is a low porosity-medium porosity, ultra-low permeability-low permeability reservoir, the porosity distribution is between 14.6-21.7%, and the average porosity is 17.5%. The main reservoir lithology is mainly argillaceous aphanitic limestone, The average limestone content is about 50%. It has the characteristics of low porosity-medium porosity, ultra-low permeability-low permeability and complex lithology. The buried depth of the reservoir is 2700-2900m. 120°C.

[0056] Prepare the ground composite cross-linking acid with controllable cross-linking time as follows:

[0057] (1) Preparation of polymer thickened acid: Prepare 1L of 15% hydrochloric acid with tap water and add it to the reaction vessel, slowly add 5.0 g of high molecular weight polymer while stirring, and continue to stir to make it fully dissolved, leave it for 2 hours, under...

Embodiment 2

[0076] Ground Crosslinking Acid Preparation:

[0077] (1) Preparation of polymer thickened acid: Prepare 1L of 15% hydrochloric acid with distilled water, add it to a three-necked flask with stirring and a thermometer, slowly add 4.0g of high molecular polymer while stirring, and continue stirring to fully dissolve it, place 2 hours, add 1.7g carboxymethyl hydroxypropyl guar gum under stirring condition, continue to stir until uniform, stand-by.

[0078] (2) Preparation of organic composite crosslinking agent: Weigh 10.7g of propyl titanate tetraacetate and add it into a three-necked flask equipped with a condenser tube, a thermometer, and a stirrer, and add 24.5g of diethanolamine while raising the temperature. , react for 40 minutes, raise the temperature to 65°C and start distillation, keep the distillation temperature at 75-78°C, when the distillate volume reaches 6.4mL, add methanol after cooling down to below 60°C, stir well and set aside.

[0079] (3) Preparation of cr...

Embodiment 3

[0083] Ground Crosslinking Acid Preparation:

[0084] Ground Crosslinking Acid Preparation:

[0085] (1) Preparation of polymer thickened acid: prepare 1000mL of 20% hydrochloric acid with distilled water, add it to a three-necked flask with stirring and a thermometer, slowly add 5.0g of high molecular polymer while stirring, and continue to stir to fully dissolve it, place 2 hours, set aside.

[0086] (2) Preparation of organometallic cross-linking agent: add 6.2 g of propyl titanate tetraacetate into a three-necked flask equipped with a condenser, a thermometer, and a stirrer, stir to make it fully dissolve, slowly add 14.0 g of triethanolamine, at 90 ° C, React for 4 hours, drop to normal temperature and discharge.

[0087] (3) Preparation of cross-linking accelerator: In a three-necked flask with a condenser, a thermometer, and a stirrer, add 79.2g of formalin, control the temperature below 30°C, add 19.1g of catechol, and slowly heat up to 40°C , add 0.05g sodium hydro...

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Abstract

The invention belongs to the technical field of oil field acidizing and fracturing, particularly relates to a preparation method of composite ground crosslinking acid controllable in crosslinking time, mainly aims to overcome the shortcoming that an existing crosslinking acid liquid system is not controllable in crosslinking time and provide a compound acid liquid system controllable in crosslinking time and resistant to temperature and a preparation method thereof. The shortcomings of underground crosslinking and uncontrollable crosslinking time of the acid liquid system existing under conventional acid pressure are overcome. A cross-linking agent and a cross-linking conditioning agent different in property are mainly utilized, the cross-linking time of the acid liquid system is controlled by adjusting proportion. In addition, organic resin is introduced in the system, so that the temperature resistance of the acid liquid system is improved.

Description

technical field [0001] The invention relates to a ground composite cross-linking acid with controllable cross-linking time, and belongs to the technical field of oil field acidizing and fracturing. Background technique [0002] Conventional acid fracturing technology is a mature oilfield technology, but conventional acid fracturing has the disadvantages of short acid-etched fractures and low conductivity. The research and application of isoacid fracturing technology, among which, gelled acid multi-stage acid fracturing technology with better effect has been widely used in Shengli Oilfield, but the crosslinking time of this acid liquid system is uncontrollable, and construction in winter or summer The shortcomings of slow crosslinking time at low temperature and too fast crosslinking at high temperature limit the application of gelling acid fracturing technology. For this reason, combined with the characteristics of Binnan Oilfield, in order to meet the needs of construction...

Claims

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Application Information

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IPC IPC(8): C09K8/68C08F220/56C08F220/58C08F212/14C08F226/10
CPCC08F220/56C09K8/685C09K8/882C09K8/90C09K2208/24C08F220/585C08F212/14C08F226/10
Inventor 李春霞高泉单欣邹新华陈伟周东新李敏
Owner 滨州市丰泰技术开发有限公司
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