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Densifier and fracturing fluid for shale gas fracturing fluid, preparation method and application thereof

A thickening agent and fracturing fluid technology, which is applied in chemical instruments and methods, earthwork drilling, and fluid production, etc., can solve the problems of high cost, reduced sand carrying capacity, and few continuous mixing devices, etc., and achieves low friction. resistance, high-efficiency viscosity-increasing properties, and good compatibility

Active Publication Date: 2014-04-30
ORIENT BAOLIN TECH DEV BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art, the sand-carrying capacity of this type of viscoelastic surfactant fracturing fluid decreases with the decrease of viscosity, and a higher concentration is used in large-scale application, and the corresponding cost is higher
[0006] In addition, at present, most of the fracturing wells in my country can realize the rapid mixing of fracturing fluid base fluids, but because there are not many continuous mixing devices, it is impossible to realize the continuous mixing of fracturing fluids prepared while construction, and only rapid mixing can be used. Base fluids with different concentrations are prepared by truck and packed in different liquid tanks. During construction, they are used according to the concentration from high to low.

Method used

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  • Densifier and fracturing fluid for shale gas fracturing fluid, preparation method and application thereof
  • Densifier and fracturing fluid for shale gas fracturing fluid, preparation method and application thereof
  • Densifier and fracturing fluid for shale gas fracturing fluid, preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] 1. Preparation of key additives for fracturing fluid

[0049] 1.1 Thickener DH-DB-1

[0050] The thickening agent in this embodiment is composed of viscoelastic surfactant (benzalkonium chloride), polyacrylamide, AMPS, methacryloxytrimethylammonium chloride, N-isopropylacrylamide, pimeloyl , caustic soda etc. are synthesized according to the volume ratio of 3:6:0.5:1.5:2:2:1, and the specific synthesis method is as follows:

[0051] Mix the viscoelastic surfactant with the polyacrylamide resin and heat it to melt completely, then add 2-acrylamido-methylpropanesulfonic acid, methacryloxytrimethylammonium chloride, N-isopropyl Acrylamide, pimeloyl, and caustic soda were stirred and reacted at 150°C for about 2 hours, and the product obtained was the thickener of this embodiment. After cooling to normal temperature, it was a solid product, and it was crushed to obtain a crystal powder, which was used for liquid thicken. The present invention calls the thickener DH-DB-1 ...

Embodiment 2

[0138] DH-DB active fracturing fluid has the construction capability of continuous mixing on site, which can meet the requirements of 8-10m sand mixing truck 3 / min construction displacement requirements.

[0139] According to different reservoir temperatures, determine the ratio of each additive, according to the order of adding additives DH-DB-1→DH-DB-2→DH-DB-3→ammonium persulfate, add to the mixing tank of the continuous mixing vehicle, and prepare the liquid supply Sand mixer. The prepared liquid is sent to the wellhead through the sand mixer truck, and finally enters the formation.

[0140] In the absence of a continuous mixing vehicle, the preparation method of large-displacement jet flow circulation can be adopted, which can also meet the requirement of providing 8-10m 3 / min construction displacement requirements. The order of additive addition is the same as for continuous compounding.

[0141] Field application

example 1

[0143] Well Test 3 is a shutdown well, the target layer is Mountain 1, the reservoir temperature is 90°C, and the fractured interval is 2622.0-2626.0m. HPG cross-linked jelly was used for primary fracturing, with an average sand ratio of 21.6% and sand addition of 35.1m 3 , stop pump pressure 27MPa. After fracturing, 3.0mm, 4.0mm, and 5.0mm nozzles were used to control the spraying and drainage, and the spraying and drainage was opened later. The flowback rate of the fracturing fluid was 72.83%. Using one-point method to calculate production, the average stable gas production is 0.6400×10 4 m 3 / d, average water production 0.13m 3 / d, the calculated unimpeded flow is 2.1533×10 4 m 3 / d. The fracturing effect is poor.

[0144] Select DH-DB active CO for repeated fracturing 2 For foam fracturing fluid construction, the fracturing fluid (0.6% thickener DH-DB-1+0.4% rheology additive DH-DB-2) and CO 2 In different proportions (CO 2 The mass ratio of foam is less than 30%...

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Abstract

The invention provides densifier and fracturing fluid for shale gas fracturing fluid, a preparation method and application thereof. The densifier is synthesized by viscoelastic surfactant, polyacrylamide, 2-propeneamido-methylpropanesulfonic acid, methacryloxy trimethyl ammonium chloride, N-isopropylacrylamide, pimeloyl and caustic soda flakes in a ratio of 3:(5-7):(0.4-0.6):(1-2):(1.5-2.5):(1.5-2.5):(0.8-1.2). The fracturing fluid comprises the densifier, a rheological aid mixed by surfactant and ethanol in a ratio of 1:(1.5-2.5), and a temperature stabilizing agent. The invention also provides application of the fracturing fluid in shale gas continuous sand fracturing and a shale gas continuous sand fracturing method. The fracturing fluid is clean fracturing fluid, has the characteristics of low hurt, effective thickening, temperature resistance, salt resistance, shearing resistance, low friction and the like, and is good in compatibility with other common water-borne fracturing fluid additives.

Description

technical field [0001] The present invention relates to a viscosifier for shale gas fracturing fluid, fracturing fluid and its preparation method and application. Thickening agent, preparation method of the thickening agent, composition for fracturing fluid containing the thickening agent, fracturing fluid containing the thickening agent, application of the fracturing fluid in continuous sand fracturing of shale gas, and Shale gas continuous sand fracturing method. Background technique [0002] my country's oil and gas fields have abundant reserves in low-permeability layers, but their natural production capacity is low or has no natural production capacity at all. The application of fracturing fluid technology to develop such oil and gas reservoirs is of great significance. The main function of fracturing fluid is to carry viscoelastic fluids (quartz sand, ceramsite, etc.) into the fractured formations to increase permeability to increase oil and gas production. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C08F265/10E21B43/26
CPCC08F265/10C09K8/602C09K8/68C09K8/882E21B43/26C09K2208/30C08F220/585C08F220/34
Inventor 杜林麟杜林涛王宇
Owner ORIENT BAOLIN TECH DEV BEIJING
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