Method for controlling jarring delay of jar in high-temperature environment

Abstract

The invention discloses a method for controlling jarring delay of a jar in a high-temperature environment, a valve body and a pressure body of the jar are made of alloy steel materials with the same performance, and it is guaranteed that the thermal expansion coefficients of the valve body and the pressure body are the same at the same temperature. The alloy steel material is bearing copper alloy. The periphery of the valve body is further coated with a sealing wear-resistant layer, and the performance of the sealing wear-resistant layer is similar to that of an alloy steel material of the valve body. The sealing wear-resistant layer is a laser cladding layer, and the laser cladding layer is made of copper-based powder. And the thickness of the sealing wear-resistant layer is 2-3mm. The method is used for realizing and controlling the reliable jarring delay of the oil underground tool jar under the working condition of the ultra-deep well high-temperature environment, solves the problem that in the prior art, the jar is not jarred under the environment with the temperature higher than 150 DEG C, and ensures that the jar normally works on a bottom layer with the depth being lower than 7000 meters.

Description

TECHNICAL FIELD

[0001] The present application relates to a method for controlling the high-temperature environment shock delay of a shock tool, and belongs to the technical field of oil and gas field exploitation. BACKGROUND

[0002] The shock tool is a commonly used tool for handling the sticking accident in drilling operation, and is divided into hydraulic and mechanical types according to different structural types. In particular, the hydraulic shock tool needs to rely on the flow of hydraulic oil to generate shock during operation, so the viscosity of the hydraulic oil has a great influence on the shock performance. With the development of drilling technology, the drilling depth is also becoming deeper and deeper, and the underground environment temperature of the shock tool is also becoming higher and higher. For example, the average drilling depth of the Tarim oil field in China can reach more than 7000 meters, and the underground environment temperature can be as high as 180℃. With the increase of temperature, the viscosity of the hydraulic oil in the shock tool decreases, thereby causing the delay time of the shock tool to be shortened, and even the shock tool may not shock.

[0003] The traditional hydraulic shock tool can be regarded as being composed of an inner part and an outer part which can move relatively. The inner part is generally composed of an upper mandrel, an intermediate mandrel and a lower mandrel, and a valve body is installed on the intermediate mandrel. The valve body is a circular ring with a blind through hole in the middle for installing a valve needle, a filter element and a plug. The outer structure is a connecting body, a pressure body and a lower joint. The outer circle of the valve body is in interference fit with the pressure surface of the pressure body, and when the valve body passes through the pressure surface of the pressure body, the outer circle of the valve body is in a sealed state.

[0004] The principle is shown in Figures 2-5

[0005] 1. When the shock tool needs to be started to shock upward, the upper mandrel is lifted, and before the outer circle of the valve body contacts the pressure surface of the pressure body, the upper mandrel and other internal components move upward without resistance.

[0006] 2. When the outer circle of the valve body contacts the pressure surface of the pressure body, due to the interference fit between the outer circle of the valve body and the pressure surface of the pressure body, a sealing effect is generated, and the hydraulic oil located on the left side of the valve body can only slowly flow to the right side of the valve body through the upper valve needle of the valve body. At this time, the upper mandrel is subjected to resistance during the lifting process, which provides sufficient time for the elastic deformation of the drilling tool at the upper part of the shock tool. When the valve body passes through the pressure surface, the inner diameter of the cavity suddenly increases, and the hydraulic oil can flow from the four sides of the valve body. The resistance of the lifting is instantly removed, the elastic potential energy stored in the drilling tool at the upper part of the shock tool is released, and like a stretched spring suddenly losing restraint, the upper mandrel forms a one-time upper shock work upward. When the shock is needed again, the upper mandrel is slowly pressed down to move the valve body to the initial position of the shock, and the above operation can be repeated to shock again.

[0007] ​Through the above principle, to realize the jarring operation, the key is whether the outer circular surface of the valve body can realize sealing when passing through the pressure body. The suitable hardness matching of the pressure body and the valve body is that the pressure body is an integral structure, and the working pressure is high and the tensile and torsional strength is high. According to the requirements of the working condition, the pressure body selects a medium-carbon alloy steel with high hardness and strength. The valve body is an easily damaged part, and the hardness is relatively low. The valve body reciprocates in the hydraulic chamber of the pressure body and is easy to wear, so a bearing copper alloy material is selected. The jarring delay time of the jar can work normally under the environment of 120°.

[0008] However, as the working condition of the jar is continuously deepened, the environmental temperature is higher and higher, such as the working temperature requirement of the jar in Tarim oil field has been increased to 180°, and the jar cannot work normally under high temperature environment. However, the tool can meet the design requirements of jarring delay time after being taken out of the well and returned to the factory for maintenance and ground test.

[0009] Therefore, the jar has a suitable sealing interference amount at normal temperature and can work normally, but the sealing interference amount is not suitable at high temperature, so the jar cannot work normally at high temperature. SUMMARY

[0010] The purpose of the present application is to provide a method for controlling the jarring delay time of a jar in a high temperature environment. Under the condition of not greatly increasing the manufacturing cost, the problem of not jarring under the working condition of higher than 150℃ is solved, and the jar can normally work in the bottom layer below 7000 meters, and the jarring delay time can meet the working requirements.

[0011] The technical scheme of the present application is a method for controlling the jarring delay time of a jar in a high temperature environment, the material of the valve body and the pressure body of the jar is selected to be the same alloy steel material, so that the thermal expansion coefficients of the valve body and the pressure body are the same at the same temperature.

[0012] In the foregoing method for controlling the jarring delay time of a jar in a high temperature environment, the alloy steel material is a bearing copper alloy.

[0013] In the foregoing method for controlling the jarring delay time of a jar in a high temperature environment, the valve body is further coated with a sealing wear-resistant layer, and the performance of the sealing wear-resistant layer is similar to that of the alloy steel material of the valve body.

[0014] In the foregoing method for controlling the jarring delay time of a jar in a high temperature environment, the sealing wear-resistant layer is a laser cladding layer, and the material used in the laser cladding layer is a copper-based powder.

[0015] In the foregoing method for controlling the jarring delay time of a jar in a high temperature environment, the thickness of the sealing wear-resistant layer is 2-3mm.

[0016] The beneficial effects of the present application: compared with the prior art, the present application adopts the technical scheme described above, which has the following advantages compared with the traditional hydraulic jar:

[0017] 1. The problem of jar failure in high temperature environment of traditional hydraulic jar is solved.

[0018] 2. By adding a laser cladding layer to the outer circle of the valve body, the sealing problem between the outer circle of the valve body and the pressure body is solved, and the process is simple and the cost is low.

[0019] 3. For different specifications and sizes of jars, different interference amounts can be obtained by adjusting the thickness of the cladding layer. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a schematic view of the valve body structure provided with a laser cladding layer.

[0021] Figure 2 is a schematic view of the jar before jar;

[0022] Figure 3 is a schematic view of the jar when the jar starts to build pressure;

[0023] Figure 4 is a schematic view of the jar when the jar builds pressure;

[0024] Figure 5 is a schematic view of the jar when the jar jar releases. DETAILED DESCRIPTION

[0025] The present application will be further described below in conjunction with the drawings and examples, but it is not limited as a basis for the present application.

[0026] Embodiment of the present application: a method for controlling the high temperature environment jar delay, for realizing and controlling the reliable jar delay of the downhole tool jar in the ultra-deep well high temperature environment working condition, solving the problem that the jar does not jar in the environment higher than 150 DEG C in the prior art, and ensuring that the jar works normally in the bottom layer deeper than 7000 meters.

[0027] The scheme adopted by the method of the present application is as follows:

[0028] 1. First, the valve body and the pressure body of the jar tool are made of alloy steel materials with the same performance (both are made of bearing copper alloy), that is, the materials used for the valve body and the pressure body are the same kind of alloy steel material, so as to ensure that the thermal expansion coefficients of the valve body and the pressure body are the same at the same temperature.

[0029] 2. Secondly, in order to solve the sealing problem between the outer circle of the valve body and the pressure body, the laser cladding process is used on the sealing surface of the outer circle of the valve body to achieve sealing and wear resistance. The specific method is to melt a layer of 2-3mm thick copper-based powder with similar performance to bearing copper alloy material on the sealing surface of the outer circle of the valve body, and then grind the surface of the laser cladding layer. The valve body processed in this way has the same thermal expansion coefficient as the pressure body, and the interference relationship between the two will not increase with temperature changes, while the surface of the valve body still has the hardness and wear resistance characteristics of the original bearing copper alloy material.

[0030] Different size shocker delay control method: for different size shocker, different size shocker is suitable for different well depth. Small size shocker is suitable for deeper well and higher working temperature. By adjusting the thickness of the cladding layer of the sealing surface of the outer circle of the valve body, different interference amount is obtained to ensure the shock delay requirement of different size shocker.

Claims

1. A method for controlling the vibration delay of a shocker in a high-temperature environment, characterized in that: The valve body and pressure body of the shock absorber are made of alloy steel with the same properties to ensure that their coefficients of thermal expansion are the same at the same temperature.

2. The method for controlling the vibration delay of a shocker in a high-temperature environment according to claim 1, characterized in that: The alloy steel material mentioned is a bearing copper alloy.

3. The method for controlling the vibration delay of a shocker in a high-temperature environment according to claim 2, characterized in that: The valve body is also covered with a sealing and wear-resistant layer, the performance of which is similar to that of the alloy steel material of the valve body.

4. The method for controlling the vibration delay of a shocker in a high-temperature environment according to claim 3, characterized in that: The sealing and wear-resistant layer is a laser cladding layer, and the material used for the laser cladding layer is copper-based powder.

5. The method for controlling the vibration delay of a shocker in a high-temperature environment according to claim 3, characterized in that: The thickness of the sealing and wear-resistant layer is 2-3 mm.

Images