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A Method of Controlling the Extension Height of Hydraulic Fracture

A hydraulic fracturing and hydraulic fracturing technology, which is applied in chemical instruments and methods, earthwork drilling, and drilling compositions, etc., can solve problems such as rising water volume, low fracturing fluid efficiency, and failure to effectively control fracture extension, etc., to achieve Guarantee the volume, expand the scope of influence, and enhance the effect of transformation

Active Publication Date: 2019-05-10
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a method for controlling the extension height of hydraulic fractures, which is used to solve the problem of low efficiency of fracturing fluid caused by fracturing cracks penetrating through the reservoir due to the thin reservoir during the fracturing process; and Containing water layers, the fracturing process did not effectively control the extension of fractures, resulting in a rapid increase in water volume after fracturing, affecting the normal production of oil and gas wells, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The middle-deep 2s well in the eastern oilfield is 24 m thick. There is a water layer at the upper part of 59 m and a good interlayer at the lower part. The transformation effect is effectively increased, and the fracturing transformation is carried out by adopting the method of the invention. The core of the fracturing of this well is to control the height of the upper end of the fracture to avoid the formation of effective fractures in the water layer. The construction method is as follows: guar gum fracturing fluid with a viscosity of 65 mPa·s 3 / min displacement into formation 70m 3 liquid, press open the formation to form fracturing fractures; 3 5m with the guide agent on the upper end of the control crack 3 Mix in the mixer truck to 2 m 3 / min displacement to inject the mixed solution into the formation; 3 / min displacement to inject 50 m of fracturing fluid with a viscosity of 50 mPa·s 3 ;Finally inject proppant-containing fracturing fluid in a conventional...

Embodiment 2

[0033] An oil well in the Northeast Oilfield has a pay zone depth of 3211.0-3218 m, a reservoir thickness of only 7 m, and thin upper and lower cap rocks. In the early stage of fracturing, the upper and lower heights of the fractures were not controlled, resulting in excessive vertical extension of fracturing fractures and horizontal fractures. If the length is too short, it is difficult to add proppant, and the transformation effect is poor. Transform according to the present invention to control the up and down directions of the cracks. The construction method is: use guar gum fracturing fluid with a viscosity of 50 mPa·s at 5 m 3 / min displacement into formation 30m 3 liquid, press open formations to form fracturing fractures; after the injection is completed, guar gum fracturing fluid with 40 mPa·s 3 6m with the guide agent controlling the upper and lower ends of the crack 3 (Control upper end guide agent 3m 3 , control the lower end of the directing agent 3m 3 ) mixed...

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Abstract

The invention discloses a method for controlling hydraulic fracture extension heights. The method comprises the following steps in sequence: injecting fracturing fluid of which the viscosity is within 40-80mPa*s into a stratum in a displacement of 5-10m<3> / minute to fracture the stratum, wherein the injection amount of a single crack is 20-80m<3>; mixing fracturing fluid of which the viscosity is within 30-50mPa*s with a guide agent in a sand mixing machine, injecting the mixed liquid into the stratum in a volume ratio of the fracturing fluid to the guide agent of 100:(5-20) in a displacement of 1-3m<3> / minute, wherein the injection amount is 20-60m<3>; injecting fracturing fluid of which the viscosity is within 30-50mPa*s into the stratum in the displacement of 3-5m<3> / minute, wherein the injection amount is 30-50m<3>; injecting fracturing fluid with a propping agent by using a common method, wherein the guide agent is an upper guide agent, a lower guide agent or a mixture thereof. By adopting the method, the problems that in the fracturing process, as a reservoir is relatively thin, the efficiency of fracturing fluid is low as fracturing cracks penetrate through the reservoir, normal production of gas / oil wells is affected as water layers exist near the reservoir and the water amount is rapidly increased after fracturing, and the like, are solved, and the method is reliable in principle, simple and convenient to operate and wide in market prospect.

Description

technical field [0001] The invention belongs to the field of petroleum and natural gas development, and in particular relates to a method for controlling the extension height of hydraulic fractures in oil and gas production stimulation and transformation. Background technique [0002] With the deepening of exploration and development of oil and natural gas resources and the further development of oil and natural gas geological theory, the development potential of low-permeability oil and gas resources has gradually been valued by the national energy department. my country has very large reserves of low-permeability oil and gas resources. As of the end of 2016, the unutilized low-permeability reserves under the jurisdiction of PetroChina alone reached 400 million tons. Therefore, how to realize the efficient development of low-permeability oil and gas resources is of great significance to the development of my country's petroleum industry. [0003] Oil and gas stimulation te...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/26E21B43/267C09K8/62
CPCC09K8/62E21B43/26E21B43/267
Inventor 王世彬赵峰郭建春李杨
Owner SOUTHWEST PETROLEUM UNIV