Rock debris annulus reinjection device and control method thereof

An annulus and cuttings technology, used in construction and other directions, can solve the problems of high cost of repairing casing, accelerated corrosion of inner annulus casing, and large economic loss of production shutdown, so as to reduce economic losses, slow down corrosion, and reduce costs. Effect

Inactive Publication Date: 2011-07-20
JEREH ENERGY SERVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The invention mainly solves the problems that the existing cuttings annulus reinjection technology is easy to accelerate the corrosion of the inner annulus casing, the cost of repairing the casing is high, and the economic loss of production shutdown is large.

Method used

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  • Rock debris annulus reinjection device and control method thereof
  • Rock debris annulus reinjection device and control method thereof
  • Rock debris annulus reinjection device and control method thereof

Examples

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Effect test

Embodiment 1

[0023] Example 1, see figure 1 , 2 , the water injection well is selected as the cuttings reinjection well, the water injection pipeline 7 is in the middle, and the inner annular space 9 is formed between the water injection pipeline 7 and the 9-5 / 8" casing 8, and the 9-5 / 8" casing 8 and the The outer annular space 11 is formed between the 13-3 / 8" casing pipes 10, and the water injection pipeline isolation valve 2, the pressure control valve 3, the inner The annulus isolation valve 4 and the inner annulus pressure gauge 5 form a device for cuttings annulus reinjection, and the pressure balance of the inner and outer annulus is realized by adjusting the pressure control valve.

[0024] A control method for cuttings annulus reinjection device of the present invention, during operation, control the cuttings reinjection grout from entering the inner annulus according to the following steps: adopt the above-mentioned installation for cuttings annulus reinjection device; predict t...

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Abstract

The invention discloses a rock debris annulus reinjection system. A water injection well is taken as a reinjection well, an inner annulus (9) is formed between a water injection pipeline (7) in the middle and a 9-5 / 8' sleeve (8), and an outer annulus (11) is formed between the 9-5 / 8' sleeve (8) and a 13-3 / 8' sleeve (10). The system is characterized in that: a water injection pipeline isolating valve (2), a pressure control valve (3), an inner annulus isolating valve (4) and an inner annulus pressure meter (5) are arranged between an extension pipe (1) of the water injection pipeline (7) and an outlet pipeline (6) of the inner annulus (9). The system is used for the rock debris reinjection operation technology of offshore oilfield drilling; and when rock debris is reinjected into the outer annulus between the 13-3 / 8' sleeve and the 9-5 / 8' sleeve, the allowable outlet pressure of the pressure control valve is adjusted, and the inner annulus is pressurized, so that rock debris reinjection slurry cannot flow into the inner annulus, the space of the inner annulus is protected, and the completeness of the water injection well is protected.

Description

Technical field: [0001] The invention relates to the technical field of drilling in offshore oilfields, in particular to a device capable of reinjecting cuttings into annulus without repairing the casing and a control method thereof, which is used for cuttings reinjection in drilling in offshore oilfields. Background technique: [0002] In the past ten years, with the continuous improvement of public awareness of environmental protection and the continuous improvement of laws and regulations, the oil and gas industry has taken various measures to minimize the cuttings and other wastes generated by drilling in order to better protect the environment and public safety. Drilling and production waste mainly refers to drilling cuttings, residual mud after drilling, production sand, oil tank sludge and other wastes. [0003] Disposal of offshore drilling waste is limited to discharge, reinjection or transport back to shore for disposal. There are many ways to deal with waste, bu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B21/01
Inventor 邓连军王坤晓陈开军
Owner JEREH ENERGY SERVICES
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