CN103790542B - A coiled tubing suspension sealing device for testing under high temperature and pressure and its use method - Google Patents

Abstract

A coiled tubing suspension sealing device for testing under high-temperature pressure and a use method thereof belong to the technical field of mechanical oil extraction equipment. The gland flange is connected with the suspension flange through bolts and nuts, a sealing gasket ring is arranged between the gland flange and the suspension flange, the inner cavity of the suspension flange is connected with a suspension slip assembly, the other end of the suspension flange is connected with a conversion joint, the inner cavity of the conversion joint is connected with an O-shaped ring and a high-temperature-resistant self-sealing rubber core, the other end of the conversion joint is connected with a lower seal body, the other end of the lower seal body is connected with a pressure cap, the inner cavity of the lower seal body is connected with an upper spacing ring and a lower spacing ring, and the hole wall of the lower. The invention has the advantages of solving the requirement of the coiled tubing under-pressure operation for testing the heavy oil thermal production well, adopting the suspension and anti-jacking bidirectional slip assembly structure and the pressure self-sealing rubber core, having simple structure, reasonable design and reliable work, providing equipment support for the mobile high-temperature test of the coiled tubing and having good field application prospect.

Description

A coiled tubing suspension sealing device for testing under high temperature and pressure and its use method

technical field

The invention relates to a coiled tubing suspension sealing device for testing under high temperature and pressure and a method for using it, and belongs to the technical field of mechanical oil production equipment.

Background technique

In recent years, Xinjiang Oilfield has begun to develop heavy oil and super heavy oil on a large scale, mainly including steam huff and puff, SAGD super heavy oil production and fire flooding production, among which coiled tubing downhole testing is an important part. Currently in the project test stage, each well is prefabricated with test coiled tubing, and the test coiled tubing needs to be removed during periodic huff and puff preheating and pumping operations. According to the current development direction of hot workover, the supporting equipment must meet the requirements In addition, when the entire SAGD production process is running in the later stage, if each well is prefabricated with coiled tubing for testing, the production cost is high. Considering the use of mobile downhole testing, the coiled tubing needs to be lifted and tested at any time, so the design The hanger sealing device of the coiled tubing that meets the requirements of the high temperature test of the high temperature wellhead under pressure.

Contents of the invention

In order to overcome the deficiencies of the prior art, the present invention provides a coiled tubing suspension seal device and method of use under high temperature and pressure extraction, mainly for the purpose of realizing the suspension seal of coiled tubing during the ultra-heavy oil production process, and meeting the pressure requirements in the later stage. It provides necessary technical support for the thermal recovery of ultra-heavy oil.

A coiled tubing suspension sealing device for testing coiled tubing under high temperature and pressure. , lower sealing body, grease injection valve, lower spacer ring, pressure cap and other component groups, which provide equipment support for the later operation of testing coiled tubing under pressure, and realize testing coiled tubing under pressure in the process of super heavy oil production The purpose of lifting is to improve the safety and construction efficiency of underground operations, while reducing labor intensity and saving a lot of production costs.

A suspension sealing device for testing coiled tubing under high temperature and pressure. The gland flange is connected to the suspension flange through bolts and nuts. There is a gasket ring between the gland flange and the suspension flange. The inner cavity of the suspension flange is connected to the suspension card. The tile assembly, the other end of the suspension flange is connected to the conversion joint, the inner cavity of the conversion joint is connected to the O-ring, the high temperature self-sealing rubber core, the other end of the conversion joint is connected to the lower sealing body, and the other end of the lower sealing body is connected to the pressure cap. The inner cavity of the sealing body is connected with the upper spacer ring and the lower spacer ring, and the hole walls of the lower sealing body are symmetrically connected with grease injection valves respectively.

A method for using a coiled tubing suspension sealing device under high temperature and pressure lift test, comprising the following steps: loading the lower spacer ring and the lower part of the lower sealing body, tightening the pressure cap, installing a grease injection valve, and installing from the upper part of the lower sealing body Upper spacer ring, tighten the adapter, install the high temperature resistant self-sealing rubber core and O-ring into the upper part of the adapter, connect the suspension flange with the adapter and tighten them, install the suspension slip assembly in sequence, install the gasket ring and Gland flange, with tightening bolts and nuts;

The grease injection valve is injected with high-temperature medium to seal, and the rotation of the opening and closing screw is controlled to realize the opening and closing of the high-temperature grease injection valve. The suspension and anti-top two-way slip assembly structure is adopted, and the high-temperature self-sealing rubber core is used to test the coiled tubing with pressure. Down; According to the pressure in the well, the self-sealing rubber core is forced to hold the coiled tubing tightly.

The advantage of the present invention is that it solves the requirement of the hot-oil testing coiled tubing in heavy oil thermal recovery wells, and adopts the suspension and anti-top two-way slip component structure and the pressure self-sealing rubber core, which has simple structure, reasonable design and reliable operation. The mobile high temperature test provides equipment support and has a good prospect for on-site application.

Description of drawings

A more complete and better understanding of the invention, and many of its attendant advantages, will readily be learned by reference to the following detailed description when considered in conjunction with the accompanying drawings, but the accompanying drawings illustrated herein are intended to provide a further understanding of the invention and constitute A part of the present invention, the exemplary embodiment of the present invention and its description are used to explain the present invention, and do not constitute an improper limitation of the present invention, as shown in the figure:

Fig. 1 is a structural schematic diagram of the present invention.

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

detailed description

Obviously, many modifications and changes made by those skilled in the art based on the gist of the present invention belong to the protection scope of the present invention.

Embodiment 1: As shown in Figure 1, a coiled tubing suspension sealing device is tested under high temperature and pressure. Gland flange 1 is connected to suspension flange 5 through bolts and nuts 3, and the connection between gland flange 1 and suspension flange 5 There is a gasket ring 2 in between, the inner cavity of the suspension flange 5 is connected to the suspension slip assembly 4, the other end of the suspension flange 5 is connected to the adapter 8, and the inner cavity of the adapter 8 is connected to the O-ring 6, the high temperature resistant self-sealing rubber core 7. The other end of the conversion joint 8 is connected to the lower sealing body 10, the other end of the lower sealing body 10 is connected to the pressure cap 13, the inner cavity of the lower sealing body 10 is connected to the upper spacer ring 9, the lower spacer ring 12, and the hole of the lower sealing body 10 Grease injection valves 11 are respectively connected symmetrically on the wall.

The method of using the coiled tubing suspension sealing device under high temperature and pressure test, first, put the lower spacer ring 12 and the lower part of the lower sealing body 10 into it, tighten the pressure cap 13, install the grease injection valve 11, and connect the thread at the lower end of the lower sealing body with the Connect the wellhead, install the upper spacer ring 9 from the upper part of the lower sealing body, tighten the conversion joint 8, install the high temperature resistant self-sealing rubber core 7 and O-ring 6 into the upper part of the conversion joint, and connect the suspension flange 5 with the conversion joint 8 And tighten it, pass the test coiled tubing through the center hole of the above components, when the coiled tubing is lowered to the designated position, install the suspension slip assembly 4 and sit in the inner hole of the suspension flange, install the gasket ring 2 and the gland method Lan, tighten the bolts and nuts, and the whole device is assembled on site.

There is a high-temperature grease injection valve, which can be injected with high-temperature medium for sealing. The high-temperature grease injection valve relies on the rotation of the opening and closing screw to realize the opening and closing of the grease injection valve. The structure is simple and the seal is reliable.

The high temperature resistant self-sealing rubber core adopts a pressure self-sealing structure, which can force the self-sealing rubber core to hold the coiled tubing tightly according to the pressure in the well. The higher the pressure, the more reliable the seal.

The suspension mechanism adopts a two-way slip structure, which not only meets the purpose of hanging the pipe column but also realizes the anti-top function.

Embodiment 2: As shown in Figure 1, a coiled tubing suspension sealing device for testing under high temperature and pressure, the gland flange 1 is connected to the suspension flange 5 through bolts and nuts 3, and the gland flange 1 is connected to the suspension flange 5 There is a gasket ring 2 between them, the inner cavity of the suspension flange 5 is connected to the suspension slip assembly 4, the other end of the suspension flange 5 is connected to the adapter 8, and the inner cavity of the adapter 8 is connected to the O-ring 6, high temperature resistant self-sealing glue The core 7, the other end of the conversion joint 8 is connected to the lower sealing body 10, the other end of the lower sealing body 10 is connected to the pressure cap 13, the inner cavity of the lower sealing body 10 is connected to the upper spacer ring 9, the lower spacer ring 12, and the lower sealing body 10 The hole walls are symmetrically connected with grease injection valves 11 respectively.

A method for testing a coiled tubing suspension sealing device under high temperature and pressure, comprising the following steps;

Install the lower spacer ring 12 and the lower part of the lower sealing body 10, tighten the pressure cap 13, install the grease injection valve 11, install the upper spacer ring 9 from the upper part of the lower sealing body, tighten the adapter 8, and insert the high temperature resistant self-sealing rubber core 7 and O-ring 6 into the upper part of the conversion joint, connect the suspension flange 5 with the conversion joint 8 and tighten them, install the suspension slip assembly 4 in sequence, install the gasket ring 2 and the gland flange, and tighten the bolts nut;

The grease injection valve is injected with high-temperature medium to seal, and the rotation of the opening and closing screw is controlled to realize the opening and closing of the high-temperature grease injection valve. The suspension and anti-top two-way slip assembly structure is adopted, and the high-temperature self-sealing rubber core is used to test the coiled tubing with pressure. Down; According to the pressure in the well, the self-sealing rubber core is forced to hold the coiled tubing tightly.

As mentioned above, although the Example of this invention was demonstrated in detail, it is obvious to those skilled in the art that many modifications can be made as long as the inventive point and effect of this invention are not substantially deviated. Therefore, all such modified examples are also included in the protection scope of the present invention.

Claims (2)

1. A coiled tubing suspension sealing device for testing coiled tubing under high temperature under pressure, characterized in that it includes a gland flange, a gasket ring, a suspension slip assembly, a suspension flange, an O-ring, a high temperature resistant self-sealing rubber core, a conversion Joint, upper spacer, lower sealing body, grease injection valve, lower spacer, pressure cap, gland flange is connected to the suspension flange through bolts and nuts, there is a gasket ring between the gland flange and the suspension flange, the suspension method The inner cavity of the flange is connected to the suspension slip assembly, the other end of the suspension flange is connected to the conversion joint, the inner cavity of the conversion joint is connected to the O-ring, the high temperature self-sealing rubber core, the other end of the conversion joint is connected to the lower sealing body, the lower sealing body The other end is connected with the pressure cap, the inner cavity of the lower sealing body is connected with the upper spacer ring and the lower spacer ring, and the hole walls of the lower sealing body are symmetrically connected with grease injection valves respectively. 2. A method for testing the coiled tubing suspension sealing device under high temperature under pressure, which is characterized in that it contains the following steps: the lower spacer ring and the lower part of the lower sealing body are packed, the pressure cap is tightened, the grease injection valve is installed, and the Put the upper part of the sealing body into the upper spacer ring, tighten the adapter, install the high temperature resistant self-sealing rubber core and O-ring into the upper part of the adapter, connect the suspension flange with the adapter and tighten them, and then install the suspension slip assembly in sequence. Install the gasket ring and the gland flange, and tighten the bolts and nuts firmly; The grease injection valve is injected with high-temperature medium to seal, and the rotation of the opening and closing screw is controlled to realize the opening and closing of the grease injection valve. The suspension and anti-top two-way slip assembly structure is adopted, and the high-temperature self-sealing rubber core is used to test the pressure lift of the coiled tubing. ; According to the pressure in the well, the high temperature resistant self-sealing rubber core is forced to hold the coiled tubing tightly.