Oil and gas well closed-space nitrogen compression-based capacity-increasing and pressure-absorbing device and method

A closed space, oil and gas well technology, applied in the field of oil and gas field exploration and development, can solve the problems of operation failure engineering accidents, damaged pipe strings, increased extrusion force outside the production pipe string, etc., to control pressure, protect pipe strings, increase bearing capacity, etc. The effect of pressure limit

Pending Publication Date: 2020-04-21
湛江市新享达油田设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this string structure, since both ends of the string are sealed by two-stage packers, the pressure of the liquid in the annular space sealed between the two-stage packers increases with temperature, which also leads to production The external extrusion force of the pipe string increases, and when it is greater than the external pressure limit of the production pipe string, the pipe string will be damaged, resulting in operation failure or engineering accidents

Method used

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  • Oil and gas well closed-space nitrogen compression-based capacity-increasing and pressure-absorbing device and method
  • Oil and gas well closed-space nitrogen compression-based capacity-increasing and pressure-absorbing device and method
  • Oil and gas well closed-space nitrogen compression-based capacity-increasing and pressure-absorbing device and method

Examples

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Effect test

Embodiment 1

[0032] combine figure 1 , figure 2 , Figure 4 as well as Figure 5 , Embodiment 1 of the present invention provides a device for compressing, increasing, and sucking pressure of nitrogen in a confined space of an oil and gas well, including: a one-way valve 6, a nitrogen injection port 1, a countersunk plug 2, a working cylinder 3, a piston 4, and a pressure-transmitting Limit tail plug 5;

[0033] The one-way valve 6 is connected with the nitrogen injection port 1;

[0034] The countersunk dead plug 2 is connected to the nitrogen injection port 1;

[0035] The piston 4 is connected to the pressure-transmissible limit tail plug 5, and the piston 4 is installed directly above the pressure-transmittable limit tail plug 5;

[0036] The piston 4 is connected to the pressure-transmissible limit tail plug 5 and both are connected to the inner wall of the working cylinder;

[0037] The nitrogen compression, volume-increasing, and pressure-suction device in the confined space ...

Embodiment 2

[0042] Embodiment 2 of the present invention provides a method for compressing nitrogen in a confined space of an oil and gas well to increase capacity and suction pressure, which is specifically carried out according to the following steps:

[0043] S1: restore the piston 4 to its initial position and inject nitrogen into the working cylinder through the nitrogen injection port 1;

[0044] S2: closing the countersunk dead plug 2 so that the nitrogen gas is sealed in the working cylinder;

[0045] S3: The wellbore pressure is transmitted to the nitrogen compression, capacity-increasing and pressure-increasing device in the confined space of the oil and gas well through the pressure-transmissible limit tail plug 5, and when the nitrogen compression, capacity-increasing and pressure-increasing device in the confined space of the oil and gas well reaches the working pressure, The piston 4 moves upward to compress the nitrogen in the working cylinder to absorb excess pressure in t...

Embodiment 3

[0048] combine Figure 3 to Figure 6 , Embodiment 3 of the present invention provides a fixing method for nitrogen compression, capacity increase and suction pressure device in the confined space of oil and gas wells. image 3As shown in , it can be tied around the oil pipe and / or casing in a symmetrical and / or eccentric manner, specifically using a clamp connection.

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Abstract

The invention provides an oil and gas well closed-space nitrogen compression-based capacity-increasing and pressure-absorbing device and method, and relates to the technical field of oil and gas fieldexploration. The device comprises a one-way valve, a nitrogen injection port, a countersunk head sealing plug, a working cylinder, a piston and a limiting tail plug capable of transmitting pressure,wherein the one-way valve is connected with the nitrogen injection port, the countersunk head sealing plug is connected with the nitrogen injection port, the piston is connected with the limiting tailplug capable of transmitting the pressure, the piston is arranged right above the limiting tail plug capable of transmitting the pressure and is connected with the limiting tail plug capable of transmitting the pressure, the piston and the limiting tail plug capable of transmitting the pressure are connected with the inner wall of the working cylinder, and the oil and gas well closed space nitrogen compression-based capacity-increasing and pressure-absorbing device is arranged on the outer walls of an oil pipe and / or a sleeve through a fixing hoop. According to the device and the method, theeffects of capacity increasing and pressure absorbing can be realized, the pressure-bearing limit of the sleeve is increased, the pressure in a closed space of an oil and gas well is effectively controlled, and a pipe column is protected.

Description

technical field [0001] The invention relates to the technical field of exploration and development of oil and gas fields, in particular to a device and method for compressing, increasing, and sucking nitrogen in a confined space of an oil and gas well. Background technique [0002] In oil exploration and development completion operations, there are the following problems: [0003] 1) The casing running program usually adopts the structural mode of conduit, surface casing, technical casing and oil layer casing. The cement does not always return to the ground (or mud surface) when cementing the well after running the casing. At this time, there is a certain mixed slurry zone between the two layers of casing. As the formation temperature recovers, the temperature in the wellbore gradually increases. The volume expansion of the liquid in the mixing zone causes the pressure to increase and squeeze the outer wall of the casing. When the pressure increases to the pressure limit of...

Claims

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Application Information

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IPC IPC(8): E21B41/00
CPCE21B41/0021
Inventor 梁汉强
Owner 湛江市新享达油田设备有限公司
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