Sand-carrying fiber and preparation and application thereof

A technology of sand fiber and fibrin glue, which is applied in the field of composite nanomaterials and oil exploration technology research, can solve the problems of delayed solubility, sand carrying and easy flowback performance, etc., and achieve low risk of fracture blockage and high conductivity Strong, good toughness and solubility effects

Active Publication Date: 2022-01-28
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, in order to meet the needs of oil and gas reservoir development and increase production and efficiency, the research on sand-carrying fibers mainly focuses on its conductivity and dispersion properties, while there are few studies on its delayed solubility, sand-carrying and easy flowback performance.

Method used

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  • Sand-carrying fiber and preparation and application thereof
  • Sand-carrying fiber and preparation and application thereof
  • Sand-carrying fiber and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] This embodiment prepares a kind of sand-carrying fiber, comprises the following steps:

[0057] 100 parts of polylactic acid, 15 parts of poly-p-phenylene terephthalamide, 3 parts of sodium dodecylbenzenesulfonate, 3 parts of citric acid, 16 parts of polyvinyl alcohol, 11 parts of glyceryl monostearate, 16 parts of polyethylene glycol, 8 parts of magnesium phosphate-fibrin glue, and 2 parts of zinc chloride were stirred at 1500 r / min for 30 minutes to obtain a uniform mixed solution.

[0058] Among them, the relative molecular weight of polylactic acid polylactic acid is 110,000, the relative molecular weight of polyvinyl alcohol is 27,000, and the relative molecular weight of polyparaphenylene terephthalamide is 55,000.

[0059] The prepared polylactic acid mixture is screw extruded and melted at 200°C, and the melted mixture is extruded into a thin stream of melt through the electrospinning equipment, and the melted mixture is extruded into a thin stream of melt throu...

Embodiment 2

[0062] In this example, the sand-carrying fiber prepared in Example 1 is tested to simulate the influence of the sand-carrying fiber on the proppant conductivity during the fracturing of the oil well reservoir, so as to understand the fractures supported by the sand-carrying fiber in the formation, The relationship between its conductivity and the change of closing pressure.

[0063] The samples were divided into experimental group and control group. In the experimental group, the sand-carrying fiber and 5g proppant (ceramsite) were paved in a single layer on the rock surface covered with copper wire mesh to keep the proppant and sand-carrying fiber dispersed evenly and tightly. . In the control group, only 5g of proppant was spread in a single layer on the rock surface covered with copper wire mesh. Turn on the diversion instrument and apply different pressure loads to obtain the diversion capacity values ​​of the experimental group and the control group under different pres...

Embodiment 3

[0066] In this example, the sand-carrying fiber prepared in Example 1 is tested to examine the influence of the sand-carrying fiber on the suspending capacity of the proppant during the fracturing process of the oil well reservoir.

[0067] Measure 1500mL of deionized water into a beaker, slowly add 4.5g of guar gum, stir at room temperature for 4 hours, and adjust the stirring speed to 1500r / min. The prepared base solution was divided into ten portions, each with 100mL in beakers. Add 50mg, 100mg, 150mg, 200mg, 225mg, 250mg, 300mg, 350mg, 400mg and 500mg of the soluble sand-carrying fiber prepared in Example 1, respectively, and prepare a copy as a blank control. Then add 1g of proppant (ceramsite) respectively, and observe the relative suspended sand performance after 1h.

[0068] image 3 For the test results of the different quality sand-carrying fibers prepared by Example 1 of the present invention to the relative suspension performance of the proppant, image 3 It sho...

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Abstract

The invention discloses a sand-carrying fiber and preparation and application thereof. The sand-carrying fiber is a polylactic acid fiber and is prepared from the following raw materials in parts by mass: 100 parts of polylactic acid (PLA), 12 to 16 parts of poly-p-phenylene terephthamide, 3 to 5 parts of sodium dodecyl benzene sulfonate, 2 to 5 parts of citric acid, 15 to 23 parts of polyvinyl alcohol, 10 to 22 parts of glycerin monostearate, 15 to 25 parts of polyethylene glycol, 10 parts of magnesium phosphate-fibrin glue and 2 to 3 parts of zinc chloride. The sand-carrying fiber has the characteristics of simple process route, good sand-carrying performance, strong flow conductivity, excellent dispersity and the like, and the loss of fracturing fluid can be effectively reduced. Magnesium phosphate-fibrin glue and zinc chloride are added into the fiber polymer, so that the prepared sand-carrying fiber has better toughness and solubility.

Description

technical field [0001] The invention relates to the research fields of composite nanomaterials and oil exploitation technology, in particular to a sand-carrying fiber with dissolvability in the hydraulic fracturing process and its preparation and application. Background technique [0002] With the shortage of conventional oil and gas resources, the focus of exploration and development of the oil and gas industry has gradually shifted to unconventional oil and gas, and more and more attention has been paid to exploration and research technologies related to unconventional oil and gas. Unconventional oil and gas reserves are huge, and tight oil and gas resources are abundant. The safe and efficient exploitation of unconventional oil and gas is related to the overall situation of energy transformation and energy security. In order to achieve the main goal of increasing production and efficiency in the development of tight oil and gas reservoirs, hydraulic fracturing has receive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/92D01F1/10D06M15/15C09K8/70C09K8/68C09K8/62D06M101/32
CPCD01F6/92D01F1/10D06M15/15C09K8/70C09K8/68C09K8/62C09K8/90C09K8/885C09K8/882C09K8/92C09K2208/08D06M2101/32D06M2200/50
Inventor 徐泉牛迎春杨子骥
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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