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A fiber temporary plugging diversion fracturing method to improve the productivity of low-permeability tight sandstone oil and gas wells

A technology for tight sandstone and well productivity, applied in the field of oil and gas well fracturing, can solve problems such as difficult to turn to fractures, easy breakthrough of fractures, and insufficient compressive capacity, and achieve the effects of flexible and adjustable construction, optimized construction parameters, and obvious construction effects

Active Publication Date: 2017-07-07
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. The controllability is weak, so that the range of fracture extension pressure does not increase much, the extension of fracture turning is not obvious, and it is difficult to form turning fractures to increase the area of ​​oil and gas drainage after pressure;
[0006] 2. Temporary plugging materials cannot be completely degraded, and cannot greatly improve the fracture conductivity, which may easily cause greater damage to the formation, or the compression resistance is not enough, and the fractures are easy to break through, so the effect of fracturing stimulation to improve low-permeability tight sandstone reservoirs is not good. obvious

Method used

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  • A fiber temporary plugging diversion fracturing method to improve the productivity of low-permeability tight sandstone oil and gas wells
  • A fiber temporary plugging diversion fracturing method to improve the productivity of low-permeability tight sandstone oil and gas wells
  • A fiber temporary plugging diversion fracturing method to improve the productivity of low-permeability tight sandstone oil and gas wells

Examples

Experimental program
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Effect test

Embodiment 1

[0035] This embodiment provides a fiber temporary plugging diversion fracturing method for improving the productivity of low-permeability tight sandstone gas wells, including the following steps:

[0036] Step 1) According to single well logging, mud logging data, reservoir stress data, lateral distribution of reservoir sandstone and development of micro-fractures, determine and select the wells and layers to implement fiber temporary plugging and diversion fracturing.

[0037] Among them, it is judged that the wells and formations selected for temporary fiber plugging and diversion fracturing meet the following conditions:

[0038] (1) The stress difference between the maximum horizontal principal stress and the minimum horizontal principal stress of the reformed sandstone reservoir is less than 9MPa;

[0039] (2) The micro-fractures in the reformed sandstone reservoir are well developed, and the average number of micro-fractures is greater than 0.5 per meter of reservoir thi...

Embodiment 2

[0055] On the basis of Example 1, this example takes Well Sudong A as an example. This well is a gas field development well. It is a typical low-permeability tight sandstone gas reservoir with multiple thin layers. There are gas layers, gas-bearing layers, and gas-bearing layers. There are 6 sub-layers in the water layer. Based on a comprehensive analysis of the logging data of the well and the development of the block, the fracturing interval is selected as the mountain 1 air layer. In order to effectively stimulate the reservoir of this well, the fiber temporary plugging diversion fracturing process was designed.

[0056] Specific steps;

[0057] Step 1) Evaluate the Well Hill 1 Whether the gas layer is suitable for fiber temporary plugging and turning to fracturing: the block mountain 1 The average stress difference between the maximum horizontal principal stress and the minimum horizontal principal stress of the formation is 6MPa. Micro-fractures are relatively develope...

Embodiment 3

[0120] On the basis of Example 1, this example takes Well Sudong B as an example. This well is a gas field development well, a typical low-permeability tight sandstone gas layer with multiple thin layers. 1 ,box 8下 The two sections were transformed by partial pressure of the mechanical fixed string, and the geological data of the well were comprehensively evaluated. It is considered that the lower part of the well is 1 Layers can implement fiber temporary plugging and diversion fracturing technology.

[0121] the well hill 1 Section construction curves such as image 3 As shown, the construction displacement is 3.0-3.4m 3 / min, add sand to fractures for the first time after the front hydraulic pressure opens the formation, and add proppant 10m 3 Finally, perform the first fiber temporary plugging, add 30kg of fiber diverting agent at 15kg / min, and the pressure suddenly increases from 48MPa to 54MPa, perform the second fiber temporary plugging after the replacement, add 160...

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Abstract

The present invention specifically relates to a fiber temporary plugging diversion fracturing method for increasing productivity of low-permeability tight sandstone oil and gas wells, comprising the following steps: 1) selecting wells and layers that can implement fiber temporary plugging diversion fracturing; 2) selecting perforated well sections and perforation parameters; 3) Optimizing and determining the fracturing construction parameters and fracturing construction pump sequence; 4) Calculating the amount of fiber temporary plugging and diverting agent, the speed of fiber addition during construction, and the pressure of fracture diversion plugging; 5) Simulation calculation of fracture closure time 6) Use fiber temporary plugging and diverting agent to seal the original fracture, and after the fracture is diverted, turn to the fracturing stage for construction. The invention can be widely used in the fracturing reconstruction of oil and gas wells in low-permeability tight sandstone multi-thin reservoirs. Through software simulation calculation, the fracturing construction parameters and fiber dosage are optimized to improve the reservoir stimulation effect. Compared with the existing technology, it has the advantages of low construction cost, strong controllability, and good post-fracture effect, which is 2-4 times the production capacity of adjacent wells.

Description

technical field [0001] The invention belongs to the technical field of oil and gas well fracturing, and in particular relates to a fiber temporary plugging diversion fracturing method for improving the productivity of low-permeability tight sandstone oil and gas wells, which is used for repeated fracturing reconstruction of old wells. Background technique [0002] Fracturing is an important way to improve low-permeability oil and gas reservoirs and achieve profitable development. Temporary plugging and diversion to fracturing technology can increase the volume of reservoir stimulation, form a complex fracture network system, increase the area of ​​oil and gas drainage, and achieve the purpose of increasing production of oil and gas wells. [0003] The conventional temporary plugging diversion fracturing method is to inject a chemical temporary plugging agent during the fracturing process to temporarily plug the fractures and force the fractures to divert and extend. The chem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/267E21B33/13
Inventor 温哲豪牟春国白建文李达马得华衣德强贾建鹏张家富朱李安傅鹏邝聃腾飞启郑斌梁凌云吴明松王嘉鑫
Owner PETROCHINA CO LTD
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