Low-harm rubber plug thickener and rubber plug composition for hydraulic fracturing and application thereof

A technology of hydraulic fracturing and thickening agent, which is applied in the directions of drilling composition, chemical instruments and methods, and production fluid, etc., can solve the problem of silty sand/silty slug crack slippage effect is not obvious, and the probability of successful control Low, relying on on-site experience to judge and other problems

Active Publication Date: 2017-02-08
ORIENT BAOLIN TECH DEV BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High fracture control process is complex and costly, and silt / powder pottery slugs have no obvious effect on severe fracture slippage
[0010] When the stress difference between storage and interlayers is low, floating and sinking agents are often used at home and abroad to manufacture artificial interlayers to improve vertical fracture toughness and achieve the purpose of controlling fracture heights. However, there is no clear optimal design method for artificial interlayers. Rely on on-site experience to judge, the probability of successful control is low
There is also a method to control the fracture height by controlling the construction displacement and adopting secondary sand fracturing, but the applicable conditions of these two technologies are extremely limited, and it is difficult to achieve the process target in most cases

Method used

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  • Low-harm rubber plug thickener and rubber plug composition for hydraulic fracturing and application thereof
  • Low-harm rubber plug thickener and rubber plug composition for hydraulic fracturing and application thereof
  • Low-harm rubber plug thickener and rubber plug composition for hydraulic fracturing and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Example 1. On-site preparation of rubber plugs and static rubber plug treatment near wellbore multi-fracture process

[0071] 1. Preparation of rubber stopper thickener

[0072] The thickening agent in this embodiment is composed of surfactant, polyacrylamide, AMPS, methacryloxytrimethylammonium chloride, N-isopropylacrylamide, pimeloyl, and caustic soda in a mass ratio of 1:2 : 1:1:2:2:1 Mix in the reactor, stir evenly, control the temperature of the reactor at 180°C, the pressure at 10MPa, and the processing time for 2 hours, the obtained product is the thickener of this example, which is used for rubber stoppers thicken.

[0073] Rubber stopper base liquid formula:

[0074] Low-residue rubber stopper thickener + rubber stopper accelerator + clear water, rubber stopper cross-linking agent is a commercially available organic boron cross-linking agent, rubber stopper breaker (BL-PJ2 package from Dongfang Baolin Technology Development (Beijing) Co., Ltd. Ammonium pers...

Embodiment 2

[0092] Example 2, dynamic rubber plug to control crack slippage

[0093] Dynamic rubber plug control crack slip process:

[0094] Before squeezing the rubber plug, a certain amount of fracturing fluid base fluid is used to create fractures, and then the rubber plug is pumped continuously at a low displacement, and the rubber plug is filled to the low stress position. After the rubber plugs have all entered the formation, continue to inject base fluid. At this time, since the low-stress area has been filled with high-viscosity rubber plugs, the fracture toughness of the low-stress area has been improved. The subsequent base fluid is directed from the blasthole along the direction of the fracture. The liquid advances, the rubber plug is pushed to both sides, when the front edge of the rubber plug is broken through ( Figure 9 ), the base fluid continues to create fractures forward and enters the normal fracturing operation.

Embodiment 3

[0107] Embodiment 3, dynamic rubber stopper controls crack height

[0108] Dynamic rubber plug control crack height process:

[0109] First use fracturing fluid-based hydraulic pressure to open the formation, and then inject the rubber plug with a low-displacement non-stop pump. Using the characteristics of high viscosity and poor fluidity of the rubber plug, it is filled in the highly extended part of the fracture to improve the fracture toughness of the extended part. The base fluid of the cracking fluid has low viscosity and good fluidity. It points in the fracture that has been opened, and forms a good fracture shape near the wellbore, so that the fracture can extend forward normally ( Figure 9 ).

[0110] Practical application example:

[0111] In layer 220III of Well XSH29, the fracture height is not easy to control. The fracturing section is 3550.6-3566.6m, the thickness is 16.0m, and the perforation section is 3557.0-3562.0m. It can be seen that the slippage of the...

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Abstract

The invention provides a low damage rubber plug thickening agent used for hydraulic fracturing, a rubber plug composition and application thereof. The thickening agent is synthesized from a surfactant, polyacrylamide, AMPS, methacryloyloxy trimethylammonium chloride, N-isopropylacrylamide, heptanedioyl and flake caustic soda in a ratio of 1:2:1:1:2:2:1. Specifically, the surfactant is a nonionic fluorinated surfactant. The invention also provides a low damage rubber plug composition that contains the thickening agent and is used for hydraulic fracturing, and also provides application of the rubber plug to the technologies of treating multi-cracks near wells, controlling crack slip and controlling crack height in fractured reservoir hydraulic fracturing transformation.

Description

technical field [0001] The invention relates to a low-damage rubber plug thickener and rubber plug composition for hydraulic fracturing and its application. Specifically, the invention relates to a thickener and rubber plug with low damage to reservoirs. The plug composition and rubber plug are used in hydraulic fracturing stimulation of fractured reservoirs to deal with multiple fractures near the wellbore, control fracture slippage, and control fracture height. Background technique [0002] Hydraulic fracturing is one of the most effective means to improve the development benefits of low-permeability oil and gas reservoirs. However, since most low-permeability oil and gas reservoirs have different degrees of natural fractures, such fractured reservoirs will have different performances in hydraulic fracturing due to the difference in the development of natural fractures and structural stress. Although the development of natural fractures is conducive to connecting the rese...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/512E21B33/13E21B43/26
CPCC09K8/602C09K8/665C09K8/68C09K8/685C09K8/86C09K8/882C09K8/887C09K2208/26E21B33/13E21B43/26E21B43/261
Inventor 陈守雨庞伟杜林涛
Owner ORIENT BAOLIN TECH DEV BEIJING
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