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Tube-outside packing and coiled tubing combined fracturing method

A technology of tubing and joint operation, applied in the direction of sealing/isolation, drilling pipe, casing, etc., can solve the problems that affect wellbore maintenance and repeated reconstruction, increase the diameter of the pipe string, and increase the construction risk, so as to reduce maintenance and treatment Difficulty and operation risk, low cost, good safety effect

Inactive Publication Date: 2020-10-30
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a fracturing method combined with external packing and coiled tubing. The first purpose is to overcome the gradual decrease in the inner diameter of the fracturing string as the number of partial pressure stages increases in the prior art. , the variable diameter of the pipe string gradually increases, and if abnormal conditions such as sand plugging occur during the fracturing process, it is difficult to deal with and the construction risk is high; retrofit problem

Method used

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  • Tube-outside packing and coiled tubing combined fracturing method
  • Tube-outside packing and coiled tubing combined fracturing method
  • Tube-outside packing and coiled tubing combined fracturing method

Examples

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Embodiment 1

[0030] Such as Figure 3-5 As shown, a fracturing method combined with external packing and coiled tubing comprises the following steps:

[0031] 1) Running multiple packers 6 to isolate the exterior of the reservoir string in sections;

[0032] 2) Run the coiled tubing fracturing string inside the isolated reservoir string, and perform fracturing step by step until the fracturing is completed;

[0033] 3) Pull out the coiled tubing fracturing string;

[0034] 4) Lower the production string and complete the well.

[0035] The fracturing method provided by the invention provides the combination of external packing and coiled tubing, by running an open-hole packer with the same specification and diameter to seal the horizontal section of the reservoir, and using a coiled tubing fracturing string for sandblasting and perforating , perform fracturing step by step, and the full diameter of the wellbore after fracturing, so that after the reservoir is stimulated, the wellbore has...

Embodiment 2

[0037] On the basis of Example 1, such as figure 1 As shown, the packer 6 is an open hole packer, and multiple open hole packers have the same diameter. The open hole packer isolates the exterior of the reservoir string in sections, and also includes a ball seat 9, a floating hoop 10, a screen 11 and a guide shoe 12, the open hole packer, the ball seat 9, the floating The hoop 10, the screen pipe 11 and the guide shoe 12 are connected in sequence. Run open hole packers of the same specification and diameter to complete the well and seal off the horizontal section of the reservoir, with uniform specifications and reduced costs; further, the open hole packers are K344, K341 and K342 three types of open hole packers for field application The sealing performance is better, and it can carry out the pretreatment construction of the formation such as large displacement forward and reverse displacement mud and well washing; the open hole packer is easy to set and unseal, and can with...

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Abstract

The invention belongs to the technical field of oil-gas field fracturing, and particularly provides a tube-outside packing and coiled tubing combined fracturing method. The method comprises steps as follows: multiple packers are tripped to carry out segmented packing on exterior of a reservoir tubular column; a coiled tubing fracturing tubular column is tripped into the packed reservoir tubular column, and fracturing is performed on the reservoir sequentially segment by segment until the fracturing is ended; the coiled tubing fracturing tubular column is pulled out; and a production tubular column is tripped and weld completion is realized. According to the fracturing method, abnormal conditions of sand plug and the like caused by the fact that in the existing segmented fracturing process,drift diameter in the fracturing tubular column is gradually reduced and variable diameter in the tubular column is gradually increased with increase of partial pressure series are avoided; and a shaft has full bore, maintenance processing difficulty and working risk of the shaft in later period are reduced, and later repeated modification is facilitated.

Description

technical field [0001] The invention belongs to the technical field of fracturing in oil and gas fields, and in particular relates to a fracturing method combined with external packing and coiled oil tubing. Background technique [0002] At present, the staged fracturing method of the open hole packer in the horizontal well of the oil and gas field is to use the drill pipe to run into the staged fracturing tool string at one time under the open hole completion condition of the horizontal section of the horizontal well, and pressurize the ball to set the open hole packer and the open hole packer. Suspend the packer, throw the ball to pressurize or rotate the string, throw away the segmented fracturing tool string, and then run the fracturing string back to connect the segmented fracturing tool string; pressurize to open the first-stage sliding sleeve, and perform the first Stage fracturing. After the first stage of construction is completed, the second-stage sliding sleeve is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B17/00E21B33/12
CPCE21B43/26E21B17/00E21B33/12
Inventor 李旭梅胡相君桂捷巨亚锋邵媛王效明王治国王尚卫赵广民张安康刘静
Owner PETROCHINA CO LTD
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