Wellhead device replacement method

A wellhead device and replacement method technology, which is applied in earthwork drilling, wellbore/well components, sealing/isolation, etc., can solve problems such as polluted formations, long cement slurry production time, and reduced replacement efficiency of wellhead devices. The effect of replacement efficiency

Active Publication Date: 2021-06-15
PETROCHINA CO LTD
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Problems solved by technology

[0004] In the process of realizing the present application, the inventor found that the above-mentioned method has at least the following defects: due to the long time for cement slurry production, and the formation is polluted after injection into the tubing and annulus, the replacement efficiency of the wellhead device is reduced

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[0063] Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with aspects of the present application as recited in the appended claims.

[0064] At present, when an oil well replaces the wellhead device during some production operations, it is necessary to open the sealed tubing and the opening of the annulus. The solution in the tubing and the annulus between the tubing and the casing is affected by the pressure in the well. Well solution overflow will occur at the empty opening, and the replacement operation cannot be pe...

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Abstract

The invention discloses a wellhead device replacement method, and belongs to the technical field of oil extraction. The method comprises the following steps of obtaining a second solution with the density higher than that of a first solution; injecting the second solution into an oil pipe; within a first preset time length, detaching a plug valve and a tubing elevator, installing a tubing hanger, a tubing nipple, the plug valve and the tubing elevator, and closing the plug valve; injecting the second solution into an annular space between a casing pipe and the oil pipe; within a second preset time length, opening a blowout preventer, detaching the tubing elevator, and arranging the tubing hanger in the annular space between the casing pipe and the oil pipe in a seated manner, wherein the tubing hanger is used for sealing the annular space between the casing pipe and the oil pipe; opening the plug valve, and injecting the second solution into the oil pipe; and within a third preset time length, detaching the blowout preventer, and installing a header pipe, a flange and a four-way joint of the upper half part of a production tree in a seated mode. The problems that in the prior art, the cement paste manufacturing time is relatively long, the stratum is polluted after the cement paste is injected into the oil pipe and the annular space, and the replacement efficiency of a wellhead device is reduced are solved, and the effect of improving the replacement efficiency of the wellhead device is achieved.

Description

technical field [0001] The present application relates to the technical field of oil recovery, in particular to a method for replacing a wellhead device. Background technique [0002] During the production process of the oil well, the required wellhead devices are different between different production steps. For example, when changing from normal construction operations to coiled tubing sand washing operations, or when in-well maintenance operations are required, the required wellhead devices are changed to Christmas trees. , the Christmas tree is a wellhead device that can support the weight of all the tubing strings in the well and seal the annulus between the tubing and casing. Since the wellhead is prone to problems such as tubing overflow and casing overflow during the production process, so In the process of replacing the wellhead, the overflow problem must be solved first. [0003] A wellhead device replacement method in the related art, including configuring cement...

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Application Information

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IPC IPC(8): E21B33/03E21B23/00
CPCE21B33/03E21B23/00
Inventor 江淑丽李进光安淑凯张光军韩文华姜兆新韩羽张明明董旭许晶吴宝路冯君鹏王佩陈善峰王海军
Owner PETROCHINA CO LTD
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