Casing deformation well chemical packer segmented volume fracturing method

A volumetric fracturing and packer technology, which is applied in sealing/isolation, production fluid, earthwork drilling and production, etc. It can solve problems such as casing deformation, inability to complete fracturing operations, and inability to pass casing change points, etc.

Inactive Publication Date: 2019-09-17
BEIJING GEPETTO OIL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the staged fracturing of horizontal wells is realized by mechanical tools. Once the casing is deformed during the fracturing process, most of the existing layering tools cannot pass through the casing deformation point and cannot further complete the fracturing operation.

Method used

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  • Casing deformation well chemical packer segmented volume fracturing method
  • Casing deformation well chemical packer segmented volume fracturing method
  • Casing deformation well chemical packer segmented volume fracturing method

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Embodiment example

[0032] Shale gas well XX has a depth of 6000m, a casing size of 5.5in, and a horizontal section length of 1500m. According to the logging interpretation results (see figure 1 ) divides the well into 24 sections (see figure 2 ) for fracturing reconstruction. Due to casing changes in the 5th to 8th sections of the original design of the well, green and high-strength fully soluble chemical packers were used for segmental reconstruction, and volume fracturing was realized with in-fracture booster. The main design parameters are as follows:

[0033] (1) Slippery water: the drag reduction rate is 77%, and the CST value is 1.05; the slippery water component formula is clear water + drag reducer.

[0034] (2) Design displacement 12-14m 3 / min;

[0035] (3) The casing transformation section is divided into 4 stages for fracturing, and the liquid volume of a single stage is 1800m 3 , the amount of sand is 100 tons;

[0036] (4) Fracturing according to the steps of the fracturing m...

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Abstract

The invention discloses a casing deformation well chemical packer segmented volume fracturing method. The casing deformation well chemical packer segmented volume fracturing method includes the steps that S1, the perforation position is determined and perforation is conducted according to stratum physical properties and logging data; S2, fracturing sequence is set according to stress intensity, the chemical packer use level and particle size combination are determined, and fracturing process parameters are designed; S3, a chemical packer is injected into a stratum to seal a crack opening and a perforation eyelet in a last fractured well section; S4, fracturing fluid is injected, at the same time, an in-seam supercharging agent is added, a first artificial crack is formed; S5, the chemical packer is injected to seal a first artificial crack opening and a perforation eyelet; S6, the fracturing fluid is injected again, at the same time, the in-seam supercharging agent is added, and a second artificial crack is formed; and S7, the chemical packer and fracturing fluid are repeatedly injected until fracturing of a casing deformation well section is completed. According to the casing deformation well chemical packer segmented volume fracturing method, segmented fracturing of a casing deformation well is realized, so that all well sections are adequately remolded, at the same time, the crack complexity can be improved by using the technology of in-seam pressurization, and the purposes of fracturing and stimulation are achieved.

Description

technical field [0001] The invention relates to the technical field of oil and natural gas production stimulation, in particular to a segmented volume fracturing technology method of a chemical packer for casing variable wells. Background technique [0002] The movement inside the earth's crust, the heterogeneity of the formation and oil layer, the tendency of the oil layer, the nature of the rock, the fault activity of the formation, and the corrosion of the formation will lead to the deterioration of the technical condition of the oil and water well casing. Once these factors are external factors, such as the injection of high-pressure water into the mud shale layer, a large variation of stress will be generated between blocks in some local areas and transferred to the casing, resulting in damage to the casing in a large area and local small block casing damage. emergence of the area. Or, when the outer extrusion force of the casing is greater than the internal pressure, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B33/13E21B43/267E21B43/14
CPCE21B43/14E21B43/261E21B43/267
Inventor 曾斌胡志朋周京伟李栓张涛
Owner BEIJING GEPETTO OIL TECH
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