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Float coupling device and casing running method

A technology of floating coupling and casing, which is applied in casing, drilling pipe, earth-moving drilling, etc., can solve the problems of difficult running of casing, many closing and opening actions, and difficulty in entering the bottom of the well, and achieves the effect of simple structure.

Pending Publication Date: 2017-09-15
CHANGQING GUJING OF CNPC CHUANQING DRILLING ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Due to the long horizontal section of extended-reach wells, the wear resistance during casing running is large. Conventional casing-running technology often causes the casing to fail to run smoothly, which brings difficulties to cementing operations. Using floating casing-running technology can solve the problem of extended-reach water Difficult running of flat well casing
[0003] However, due to the complex structure of the internal sliding sleeve of the existing floating coupling, there are many closing and opening actions. After the internal structure falls off after the casing enters the well, it is easy to stay in the upper part of the casing string and it is difficult to enter the bottom of the well. The risk of hoop shoe circulation holes will lead to the inability to carry out later cementing construction operations, which will affect the quality of cementing

Method used

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  • Float coupling device and casing running method
  • Float coupling device and casing running method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] This embodiment provides a figure 1 The floating coupling device shown includes a shell 1, and the middle part of the shell 1 is provided with a pressure cap 2 and a soluble blind plate 3. Plate 3 is connected.

[0024] The floating coupling device provided in this embodiment simplifies the internal sliding sleeve structure of the traditional floating coupling, and adopts a soluble blind plate 3, such as figure 2 As shown, during the casing running process, a temporary barrier is formed in the casing, the casing string below the floating coupling device is filled with air, and the casing string above is filled with drilling fluid. In this way, the buoyancy of the casing string below the floating coupling device is increased, and the lower casing string is in a floating state during the running of the casing, which reduces the resistance when running the casing, and because the casing string above the floating coupling The inside is filled with drilling fluid, thereby...

Embodiment 2

[0027] On the basis of Embodiment 1, this embodiment provides a floating coupling device, the lower part of the soluble blind plate 3 is a tapered surface 7, and the housing 1 is provided with a conical surface that is compatible with the soluble blind plate 3 7 matching sealing cone 5. The tapered surface 7 cooperates with the sealing tapered surface 5 of the casing 1 to play the role of sealing liquid.

[0028] Among them, such as image 3 As shown, the shell 1 is a hollow structure, both ends are processed with internal and external tapered pipe threads 4 of the same specification, internally processed with ordinary threads and sealing tapered surface 5, the threads at both ends are respectively connected with the casing strings 9 of corresponding specifications, and the internal ordinary threads The structure is connected with the pressure cap 2 to play the role of pressing the blind plate, and the sealing cone surface 5 is connected to the blind plate to play the role of...

Embodiment 3

[0032] On the basis of Example 1, this example provides a floating coupling device, the material of the soluble blind plate 3 is composed of the following substances in weight percentage, gadolinium 8-11%, yttrium 3-5%, aluminum 0.6- 1%, zinc 0.5-1.5%, the rest is magnesium, and the total weight percentage of impurities is less than 0.01%.

[0033] The manufacturing process of the soluble blind plate 3 is as follows:

[0034] Pretreatment: After calculation, weigh magnesium, magnesium-gadolinium master alloy, magnesium-yttrium master alloy, aluminum, and zinc, so that each component meets the above weight percentage, and then preheat, the preheating temperature is 200 ° C, and the time is 8 hours;

[0035] Melting and pouring: uniformly mix the pretreated raw materials and melt; use JDMF covering agent to cover, refining agent RJ6 to refine and pour, pouring temperature is 710~730°C to obtain ingots;

[0036] Homogenization heat treatment: keep the ingot at 500~540℃ for 12~20...

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Abstract

The invention provides a float coupling device and a casing running method. The device comprises a shell body, a pressing cap and a soluble blind plate are arranged in the middle of the shell body. The pressing cap is of a hollow structure, and the lower end face of the pressing cap is connected with the soluble blind plate. According to the float coupling device, the soluble blind plate structure is adopted to replace an existing inner slide sleeve structure, the structure is simple, removal drilling is not needed, smooth running of a casing can be achieved, the risk that a float shoe circulating hole of the rear end of a float collar is blocked is avoided, and following well cementation construction is not influenced.

Description

technical field [0001] The invention belongs to the technical field of cementing tools for petroleum development, and in particular relates to a floating coupling device and a casing lowering method. Background technique [0002] Due to the long horizontal section of extended-reach wells, the wear resistance during casing running is large. Conventional casing running technology often causes the casing to fail to be run smoothly, which brings difficulties to cementing operations. Using floating casing running technology can solve the problem of extended-reach water The problem of difficulty in running flat well casing. [0003] However, due to the complex structure of the internal sliding sleeve of the existing floating coupling, there are many closing and opening actions. After the internal structure falls off after the casing enters the well, it is easy to stay in the upper part of the casing string and it is difficult to enter the bottom of the well. The risk of hoop floa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/08E21B23/08
CPCE21B17/08E21B23/08
Inventor 刘丰克李志刚包国栋白新平杨晨段宏超
Owner CHANGQING GUJING OF CNPC CHUANQING DRILLING ENG
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