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A boron cross-linking agent and its use in preparing boron cross-linked fracturing fluid suitable for high-temperature deep wells

A technology of cross-linking agent and high temperature, applied in the field of fracturing fluid in oil and gas fields, can solve the problems of inability to meet the construction requirements of fracturing fluid, high construction friction resistance, poor temperature resistance, etc., and achieves significant fracturing stimulation effect and construction friction resistance. Excellent effect of low and high shear resistance

Active Publication Date: 2018-02-16
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Since the mid-1990s, my country has developed high-temperature-resistant boron cross-linking agents, and began to use them in some oil fields. These cross-linking agents have many defects: instability, easy precipitation, high construction friction, poor temperature resistance, and fast cross-linking. Can not meet the construction requirements of fracturing fluid

Method used

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  • A boron cross-linking agent and its use in preparing boron cross-linked fracturing fluid suitable for high-temperature deep wells
  • A boron cross-linking agent and its use in preparing boron cross-linked fracturing fluid suitable for high-temperature deep wells
  • A boron cross-linking agent and its use in preparing boron cross-linked fracturing fluid suitable for high-temperature deep wells

Examples

Experimental program
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Effect test

Embodiment 1

[0027] (1) Preparation of boron crosslinking agent:

[0028] Add trimethyl borate and triethanolamine with a mass ratio of 2:1 to the reactor as a reaction, add sodium hydroxide to adjust the pH value to 8, react at 68°C for 3 hours, then add a mass ratio of 1:3 borax and isopropanol, and add 4 times the quality of triethanolamine water, stir well, react at 80°C for 2 hours, after the reaction, cool to get the product which is the boron crosslinking agent.

[0029] (2) Use the above-mentioned boron cross-linking agent to prepare boron cross-linking fracturing fluid suitable for high-temperature deep wells:

[0030] Taking the total mass as 100%, first add a certain amount of water, 2% potassium chloride, 0.02% sodium hydroxide, 0.02% dodecyldimethylbenzyl chloride, 0.03% sodium thiosulfate to the Warring mixer , 0.04% fluorocarbon surfactant, add 0.6% hydroxypropyl guaridine gum into it under the condition of constant stirring, after the liquid becomes viscous, add 0.035% bor...

example 1

[0048] In a certain exploration well in Jidong Oilfield, the formation temperature is 172°C, which is the highest formation temperature in the well, and its fracturing layer: ES 3 3 ; Well section: 4740.9~4761.0m; Thickness: 9.6m; Number of layers: 4. Because the oil well is very deep, the geological conditions of the formation are complicated, and the construction is difficult, the success rate of the past construction has been relatively low. Later, OCB-I type boron cross-linked fracturing fluid system was used for fracturing in this area. Among them, the fracturing method: oil casing mixed injection, combined layer fracturing; construction pipe string combination requirements: N80- 73mm thickened tubing; bell mouth position: 3200.0m; wellhead requirements: 1000# Christmas tree; the well is designed to add 61.6 tons of sand (0.45-0.90mm high-strength ceramsite) and 340m of boron cross-linked fracturing fluid 3 , gelling water 95m 3 , the construction friction of this wel...

example 2

[0050] An exploratory well in Zhongyuan Oilfield, the well construction section: 3619.7-3946m; construction method: mixed injection of oil and casing, one injection and two pressures; porosity: 15.0-23.0%; proppant ceramsite: 120m 3 ; Formation temperature: 160°C. The well is fractured with OCB-II type boron cross-linked fracturing fluid system, and the well is designed to add 0.45 / 0.90 ceramsite for 80m 3 , fracturing fluid 745m 3 , active water 90m 3 After fracturing, the well increased oil production by an average of 8.5 tons per day, with a validity period of 60 days, and a total oil increase of 204,000 tons.

[0051] Field construction proves that the deep well high temperature resistant boron cross-linked fracturing fluid has good high temperature and high shear resistance and flowback capacity, especially in exploration wells with poor geological conditions can still achieve good construction results, which fully demonstrates that the boron Cross-linked fracturing fl...

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Abstract

The invention discloses a boron cross-linking agent and a boron crosslinking fracturing fluid used for high temperature deep well. The boron cross-linking agent is a boron-based multi-element chelate, which takes a boron-containing compound and a chelating agent as main materials and water as a solvent for reacting under certain pH value and temperature. The boron crosslinking fracturing fluid comprises the following components by mass percentage: 0.02-0.04% of boron cross-linking agent, 0.3-0.6% of thickening agent hydroxypropyl guanidine gum, 0.02-0.03% of bactericide dodecyl dimethyl benzyl chloride, 1-2% of clay stabilizing agent potassium chloride, 0.02-0.03% of high temperature stabilizing agent stabilizing agent sodium hyposulfite, 0.04-0.05% of fluorocarbon surfactant, 0.02-0.03% of PH conditioning agent sodium hydroxide and balance of water. The boron cross-linking agent can effectively control the crosslinking speed, the boron crosslinking fracturing fluid has good high temperature resistance and high shear performance, and has the advantages of low frictional resistance, easy flowback and wide market prospect.

Description

technical field [0001] The invention relates to the technical field of oil and gas field fracturing fluids, in particular to a boron crosslinking agent and a boron crosslinking fracturing fluid prepared by the same which is suitable for high-temperature deep wells. The temperature resistance of the fracturing fluid system can reach 175°C. Background technique [0002] With the continuous development of oilfield mining technology, the easily recoverable reserves of oilfields are becoming less and less. At present, the exploration and development of deep well oil and gas reservoirs has become the focus of people's research. Due to the high temperature and small porosity of deep well formations, high requirements are placed on the temperature and shear resistance of fracturing fluids. [0003] Crosslinkers are a key factor in keeping fracturing fluids performing well. The earliest cross-linking agents used were borates, aluminum sulfate and antimonates, but the fracturing flu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68C07F5/04
CPCC07F5/04C09K8/602C09K8/605C09K8/608C09K8/685C09K8/887
Inventor 刘通义陈光杰史群妮谭坤林波
Owner SOUTHWEST PETROLEUM UNIV
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