Wellhead assembly bottom connecting device for shortening surface-drilling working time

A wellhead device and connection device technology, which is applied in the direction of wellbore/well components, earthwork drilling, sealing/isolation, etc., can solve the problems of increased drilling operation time, complicated cementing operation, low work efficiency, etc. The effect of reducing the difficulty of well operations, improving the efficiency of field operations, and saving cleaning time

Pending Publication Date: 2019-01-25
SHANDONG KERUI WELL CONTROL SYST MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This bottom connection method has the following three disadvantages. First, the threaded connection tightening method is complicated. The casing hydraulic caliper cannot clamp the wellhead device and tighten it to the surface casing. Turn wellhead to specified torque and tighten to surface casing
The second is that the cementing operation is complex and requires a special cementing tool. The lower end of the tool is connected to the drill pipe short and the sealing plug, and then cement is injected from the inside of the drill pipe to prevent the cement from adhering to the inner hole of the casing head. Each sealing surface
The third is that the bottom connection method cannot realize emergency connection. When the surface casing is stuck and lowered to a specified depth, it cannot be directly converted from the threaded bottom connection to the emergency slip connection.
The bottom connection can only be carried out after the surface casing is completely cemented, and a series of operations such as casing cutting and grinding are required, which increases the drilling operation time and reduces work efficiency. See image 3

Method used

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  • Wellhead assembly bottom connecting device for shortening surface-drilling working time
  • Wellhead assembly bottom connecting device for shortening surface-drilling working time
  • Wellhead assembly bottom connecting device for shortening surface-drilling working time

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] refer to Figure 4 As shown, a bottom connection device of a wellhead device for shortening the drilling operation time in one opening includes a standard base assembly 1 , a surface casing mandrel hanger 2 , an adapter 3 and a wellhead device assembly 4 . The surface casing mandrel hanger 2 is arranged on and in contact with the upper end face of the standard base assembly 1 , and the surface casing mandrel hanger 2 is screwed with the surface casing 5 . That is, during standard installation, the bottom of the wellhead device assembly 4 is threadedly connected to the surface casing 5 through the surface casing mandrel hanger 2 and the adapter 3 .

[0030] The upper end of the surface casing mandrel hanger 2 is provided with a sealing part 6 whose outer diameter is the same as the outer diameter of the surface casing 5 . During installation, the sealing part 6 extends into the lower inner cavity of the wellhead device assembly 4 and is connected to the wellhead. The in...

Embodiment 2

[0036] like Figure 5 As shown, the connection device at the bottom of the wellhead device also includes an emergency base assembly 16 and an emergency inverted slip hanger 17. The wellhead device assembly 4 is located on the upper end face of the emergency base assembly 16; during emergency installation, the bottom of the wellhead device assembly 4 passes through The emergency inverted slip hanger 17 is connected with the surface casing 5 to realize slip connection.

[0037] Among them, the emergency inverted slip hanger 17 includes a slip seat 18 and a slip tooth 19, the slip seat 18 and the slip tooth 19 are detachably connected by the set screw 20 of the side wall, and the lower end of the wellhead assembly 4 is connected by The bolt 12 is detachably connected to the slip seat 18 of the emergency reverse slip hanger 17 , and the inner wall of the lower cavity of the wellhead device assembly 4 is sealedly connected to the surface casing 5 through the sealing device 21 . Th...

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PUM

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Abstract

The invention discloses a wellhead assembly bottom connecting device for shortening surface-drilling working time, comprising a standard base assembly, a surface casing spindle hanger, an adapter joint and a wellhead assembly. A sealing unit with the outside diameter equal to the outer diameter of a surface casing is arranged at the upper end of the surface casing spindle hanger, extends to a lower inner cavity of the wellhead assembly, and is hermetically connected with the inner wall of the lower cavity of the wellhead assembly through a sealing device; a connecting unit is arranged below the surface casing spindle hanger and is in threaded connection with the adapter joint; a locking bolt connected with the upper end of the surface casing spindle hanger is arranged at the lower end of the adapter joint; a plurality of connecting bolts are arranged at the bottom of the wellhead assembly, and the adapter joint is connected with the wellhead assembly detachably through the connecting bolts. The wellhead assembly bottom connecting device has the advantages of saving time for cleaning the sealing surface, simplifying assembling of the wellhead device, shortening time for drilling andwell completion work and improving field operation efficiency.

Description

technical field [0001] The invention relates to the technical field of oil drilling and production, in particular to a bottom connecting device of a wellhead device used for shortening the drilling operation time of a first opening. Background technique [0002] At present, the connection methods between wellhead devices and surface casings at home and abroad basically adopt three types: threaded bottom connection, inverted slip bottom connection and welded bottom connection. [0003] The threaded bottom connection is that the bottom of the wellhead device and the surface casing are directly connected by casing threads. This bottom connection method has the following three disadvantages. First, the threaded connection method is complicated, and the casing hydraulic caliper cannot clamp the wellhead device to tighten the surface casing. Turn the wellhead device to the specified torque and tighten it on the surface casing. Second, the cementing operation is complex and requi...

Claims

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Application Information

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IPC IPC(8): E21B33/03E21B23/00
CPCE21B23/00E21B33/03
Inventor 王武海彭朝文李红生曾全胜李坤
Owner SHANDONG KERUI WELL CONTROL SYST MFG
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