CN218467587U - Novel coal bed gas oil pipe head - Google Patents

Abstract

The utility model is suitable for the technical field of coalbed methane mining equipment, and provides a new type of coalbed gas oil pipe head, which includes an oil pipe head cross and an upper flange. The effect of hanging the oil pipe is achieved by hanging on the internal thread of the upper flange; the lower end of the oil pipe head cross is connected with a bottom flange, and the bottom flange is equipped with a preliminary casing thread; the two sides of the oil pipe head cross Ports are equipped with manual wedge gate valves. The utility model adopts no hanger equipment, which saves the top wire for fixing the hanger, and also avoids the problem of unstable product performance caused by the leakage of the top wire; Insufficient analytical pressure of the reservoir leads to problems such as low output and unstable output.

Description

A new type of coal bed gas oil pipe head

technical field

The utility model belongs to the technical field of coal bed gas exploitation equipment, in particular to a novel coal bed gas oil pipe head.

Background technique

Coalbed methane refers to the hydrocarbon gas stored in coal seams with methane as the main component, mainly adsorbed on the surface of coal matrix particles, and partly free in coal pores or dissolved in coal seam water. It can be mixed with natural gas for mixed use, and after combustion It is very clean and hardly produces any waste gas. It is a good fuel for industry, chemical industry, power generation and residential life. At present, the commonly used coalbed methane mining method is mainly the pressure depletion method, that is to use different methods to reduce the gas pressure in the coal seam. With the reduction of the gas pressure, the coalbed methane changes from the adsorbed state to the free state through desorption. Fractures (seams) flow into coalbed methane wells until the gas pressure in the coal seam is very low. Most coal reservoirs in my country have the characteristics of low pressure, low porosity, and low permeability. Based on the existence of these objective factors, during drainage and gas production, only the casing pressure of the wellbore annulus makes the driving ability of the gas in the coal seam very large. Coupled with the limited ability of the existing drainage equipment to reduce the bottom hole pressure, the desorption degree and migration speed of coalbed methane are low, resulting in a phenomenon that the stable production period is not long and the final production is not high. To sum up, how to effectively solve the problem of low and unstable output due to insufficient analytical pressure of coalbed methane wells for low-pressure, low-porosity, and low-permeability coal reservoirs is an urgent problem to be solved by those skilled in the art.

Utility model content

The purpose of the embodiment of the utility model is to provide a new type of coal bed gas oil pipe head, aiming to solve the problems raised in the above-mentioned background technology.

The embodiment of the utility model is achieved in this way, a new type of coal bed gas oil pipe head, including the oil pipe head cross and the upper flange, the upper flange is connected with the oil pipe head cross through the fixing piece, and the oil pipe passes through the upper flange. The effect of hanging the oil pipe is achieved by hanging on the thread; the lower end of the oil pipe head cross is connected with a bottom flange, and the bottom flange is equipped with a preliminary casing thread; the ports on both sides of the oil pipe head cross are provided with Manual wedge gate valve.

Further, a VR thread plug is provided at the bypass outlet of the oil pipe head cross.

Further, the oil pipe head spool is provided with an oil pipe short connection.

Further, the fixing part is composed of bolts and nuts that cooperate with each other.

Further, the outlet of the oil pipe head is provided with a non-oil joint.

Compared with the prior art, the beneficial effects of the utility model are:

The bottom flange of this new type of coalbed methane oil pipe head is equipped with a preliminary casing thread, which can directly hang the casing in the well without the casing flange, and can quickly meet the requirements of normal operation at the wellhead; the use of no hanger equipment saves The top wire of the fixed hanger is removed, and the problem of unstable product performance caused by the leakage of the top wire is also avoided; the VR plug is inserted into the VR plug through the VR thread plug, and the bypass diameter valve can be replaced under pressure to meet the requirements of fast and normal work , the new coalbed methane oil pipe head effectively solves the problems of low and unstable output due to insufficient analytical pressure of coalbed methane wells for low-pressure, low-porosity, and low-permeability coal reservoirs.

Description of drawings

Fig. 1 is a structural schematic diagram of a new type of coal bed gas oil pipe head.

Fig. 2 is a schematic diagram of the structure of the oil pipe head cross in the new coalbed gas oil pipe head.

In the figure: 01-casing flange, 02-oil pipe head cross, 03-oil nonel joint, 04-fixing piece, 05-oil pipe short connection, 06-upper flange, 07-manual wedge gate valve, 08-wire Buckle flange, 09-top flange, 10-VR thread plug, 11-bottom flange.

Detailed ways

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

The specific implementation of the utility model is described in detail below in conjunction with specific embodiments.

As shown in Figure 1 and Figure 2, a new type of coal bed gas oil pipe head provided by an embodiment of the utility model includes oil pipe head cross 02 and upper flange 06, and the upper flange 06 is connected to the oil pipe through the fixing part 04 The head cross 02 is connected, and the oil pipe is suspended from the internal thread of the upper flange 06 to achieve the effect of hanging the oil pipe; the lower end of the oil pipe head cross 02 is connected with a bottom flange 11, and the bottom flange 11 is equipped with a preparatory Casing threads; the ports on both sides of the tubing head cross 02 are provided with manual wedge gate valves 07.

Preferably, common conventional wellheads are equipped with tubing hangers to hang tubing. However, this utility model adopts no hanger equipment, which saves the top wire of the fixed hanger, and also avoids the problem of unstable product performance caused by the leakage of the top wire; the bottom flange 11 is equipped with a preliminary casing thread, which can In the case of the pipe flange 01, the casing in the well is directly suspended, which can quickly meet the requirements of normal operation at the wellhead; the manual wedge gate valve 07 is connected with the threaded flange 08; according to the structural requirements of the manual wedge gate valve 07, the gate adopts The stainless steel is sprayed with nickel alloy, and the valve seat adopts the body surfacing welding stainless steel sealing surface, which has the characteristics of high strength, good wear resistance and corrosion resistance. The non-metallic seal is made of HNBR (hydrogenated nitrile), which has the characteristics of good sealing performance and small valve opening and closing torque. Manual wedge gate valve 07 is a full-bore two-way metal seal with a rising stem structure; The sealing is realized under the action, and the valve cavity can withstand the rated pressure at any time; the valve cover and the valve body are connected by threads, and the "O" type sealing ring is sealed, which is stable and reliable; the gate moves linearly along the guide groove, effectively reducing the pressure. The operating torque is improved; the gate surface is Ni60 alloy, and the valve seat surface is surfacing with stainless steel, so that it has good wear resistance and corrosion resistance, so the valve can be used in the environment containing H ₂ S.

As shown in FIG. 2 , as a preferred embodiment of the present invention, a VR thread plug 10 is provided at the side outlet of the oil pipe head spool 02 .

In the embodiment of the utility model, preferably, the VR plug 10 is installed into the VR plug, and the bypass diameter valve can be replaced under pressure, so as to meet the requirement of fast and normal operation.

As shown in FIG. 1 , as a preferred embodiment of the present invention, the tubing head spool 02 is provided with a tubing short 05 .

As shown in FIG. 1 , as a preferred embodiment of the present invention, the fixing member 04 includes nuts and bolts.

In the embodiment of the present utility model, preferably, the top flange 09 and the upper flange 06 on the upper part of the tubing head spool 02 are connected by nuts and bolts.

As shown in FIG. 1 , as a preferred embodiment of the present invention, the outlet of the oil pipe head is provided with a nonelon joint 03 .

In the embodiment of the utility model, preferably, the outlet of the oil pipe head is connected with the oil nonel joint 03, which has the characteristics of convenience, speed and stable performance.

The working principle of the utility model is:

In this new type of coalbed methane oil pipe head, the oil pipe is suspended from the internal thread of the upper flange 06 to achieve the effect of hanging the oil pipe; the bottom flange 11 is equipped with a preliminary casing thread, which can be directly connected Suspension of casing in the well can quickly meet the requirements of normal wellhead operations; the use of no hanger equipment saves the jacking wire for fixing the hanger, and also avoids the problem of unstable product performance caused by jacking wire leakage; through VR thread plugging 10. Install VR plugs to replace bypass diameter valves under pressure to meet the requirements of fast and normal operation.

The above are only preferred embodiments of the present utility model, and it should be pointed out that for those skilled in the art, some deformations and improvements can be made without departing from the concept of the present utility model, and these should also be regarded as the present utility model. protection scope, these will not affect the effect of the utility model implementation and the practicability of the patent.

Claims (5)

1. A novel coal bed gas oil pipe head is characterized by comprising an oil pipe head cross joint and an upper flange, wherein the upper flange is connected with the oil pipe head cross joint through a fixing piece, and the oil pipe realizes the effect of hanging the oil pipe in a mode of hanging the oil pipe on the internal thread of the upper flange; the lower end of the four-way pipe head is connected with a bottom flange, and the bottom flange is provided with a prepared casing thread; and the ports at the two sides of the four-way pipe head are provided with manual wedge gate valves.

2. The novel coal bed methane oil pipe head according to claim 1, wherein a VR thread plug is provided at a side outlet of the oil pipe head cross.

3. The novel coal bed methane oil pipe head according to claim 2, wherein an oil pipe short joint is arranged in the oil pipe head cross.

4. The novel coal bed methane oil pipe head according to claim 1, wherein the fixing member is composed of a bolt and a nut which are mutually matched.

5. A novel coal bed methane oil pipe head according to any one of claims 1 to 4, characterized in that the outlet of the oil pipe head is provided with an union joint.

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