CN104819858B - A test device for evaluating the reliability of downhole tools in horizontal wells - Google Patents

Abstract

The invention provides a test device for evaluating the reliability of downhole tools in horizontal wells, which is characterized in that it mainly includes: a top drive motor, a gear transmission box, a mud inlet, a top drive joint, a mud outlet, a drill pipe, a movable clamp, a sleeve Pipe, drill collar, pressurized clamp, downhole tool, drill bit, core, core groove, first joint, second joint, third joint and base, use top drive motor and top drive joint for drill pipe, drill The rotary power is provided by the drill collar and the drill collar; the mud inlet is used to inject mud into the drill pipe, the mud outlet is used to discharge the annular mud, the movable clamp is used to fix the entire casing, and the pressurized clamp is used to apply drilling force to the drill bit. When the test device starts to work, the mud displacement, the speed of the top drive motor and the drilling pressure applied to the drill bit can be changed to evaluate the working effect and reliability of downhole tools under different drilling conditions. The invention is suitable for the research field of petroleum and natural gas horizontal well drilling technology.

Description

A test device for evaluating the reliability of downhole tools in horizontal wells

technical field

The invention relates to the technical field of oil and natural gas horizontal well drilling, in particular to a test device for evaluating the reliability of downhole tools for horizontal wells.

Background technique

With the continuous expansion of the drilling area and the increasing difficulty of drilling, horizontal wells have become an important technical support for efficient oil and gas development. Compared with vertical wells, horizontal well development has the following five obvious advantages: 1) Drilling in fractured oil and gas reservoirs Horizontal wells can increase the drilling rate of fractures, so as to obtain productivity several times higher than that of vertical wells; 2) Drilling horizontal wells in reservoirs with bottom water and gas caps can reduce the coning speed of water and gas, and increase oil and gas single well production 3) Drilling horizontal wells in natural gas reservoirs can increase the drain area for low-permeability gas reservoirs, thereby reducing the number of production wells, and reduce the impact of turbulence for high-permeability gas reservoirs, and further increase the productivity of gas reservoirs ;4) Drilling horizontal wells as injection wells can improve oil displacement efficiency in water injection, gas injection, miscible flooding and polymer flooding; 5) Drilling horizontal wells in thin oil reservoirs, low pressure and low permeability reservoirs can increase the The contact area with the oil layer can significantly improve the oil production and recovery; therefore, the horizontal well drilling technology has become an important drilling technology today.

Of course, in order to make horizontal wells safe, high-quality, and fast, many newly developed downhole tools need to be used during horizontal well drilling, such as MDW (Measurement While Drilling Tool) and LWD (Logging While Drilling Tool) and other measurement tools and Speed-up tools such as PDW (screw drilling tool), hydraulic pressurization, pulse jet, etc. However, the effect and reliability of the newly developed downhole tools will seriously affect the drilling effect and drilling quality of horizontal wells. On the contrary, the drilling parameters and drilling fluid It will also affect the effectiveness and reliability of downhole tool work. Therefore, in order to ensure that the newly developed downhole tools work normally and efficiently in the actual downhole, it is necessary to carry out simulation tests of the newly developed downhole tools working under different drilling conditions, and systematically evaluate the working effect and reliability of the new downhole tools .

At present, there is no test device in China that can simulate the work of downhole tools in drilling conditions, and it is impossible to systematically evaluate the working effect and reliability of newly developed downhole tools. Reliability test device, which can carry out simulation tests of downhole tools working under different drilling conditions, and realize systematic evaluation of downhole tool working effects and reliability.

Contents of the invention

The purpose of the present invention is to propose a test device for evaluating the reliability of downhole tools in horizontal wells.

To achieve the above object, the present invention takes the following technical solutions:

A test device for evaluating the reliability of downhole tools in horizontal wells proposed by the present invention is characterized in that it mainly includes: top drive motor, gear transmission box, mud inlet, top drive joint, mud outlet, drill pipe, mobile clamping pliers, Casing, drill collar, pressurized gripper, downhole tool, drill bit, core, core groove, first joint, second joint, third joint and base. Among them, the top drive motor is used to provide power for the entire test device, driving the drill pipe, drill collar and drill bit to rotate; the gear transmission box is fixed on the base to transmit the power of the top drive motor; the mud inlet is used to inject Mud, the mud outlet is used to discharge the annular mud, the top drive joint is used to connect the drill pipe and the gear transmission box, the first joint is used to connect the drill pipe and the drill collar, the second joint is used to connect the drill collar and the downhole tool, and the third joint is used to connect the drill pipe and the drill collar. The joint is used to connect the downhole tool and the drill bit; the movable clamp can slide left and right on the base to fix the entire casing; the pressurized clamp is fixed on the base to apply drilling pressure to the drill bit and fix the casing. When the test device starts to work, pressurized clamping pliers apply leftward pressure to the casing. According to the principle of action force and reaction force, the drill pipe in the casing will apply rightward pressure to the drill bit, that is, the pressure on bit.

The advantages of the present invention are:

(1) The simulation test of downhole tools working under different drilling conditions can be carried out, and the system evaluation of the working effect and reliability of downhole tools (especially the newly developed downhole tools) can be carried out, providing a basis for the research and development of horizontal well drilling technology A relatively complete intermediate test condition was established;

(2) The device has simple structure, convenient operation and low cost, and can truly simulate the drilling process of a horizontal well.

Description of drawings

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

detailed description

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

Referring to Fig. 1, a kind of test device for evaluating the reliability of horizontal well downhole tools proposed by the present invention is characterized in that it mainly includes: top drive motor 1, gear transmission box 2, mud inlet 3, top drive joint 4, mud outlet 5 , drill pipe 6, mobile clamping pliers 7, casing 8, drill collar 9, pressurized clamping pliers 10, downhole tool 11, drill bit 12, rock core 13, rock core groove 14, first joint 15, second joint 16. The third joint 17 and the base 18. Among them, the top drive motor 1 is used to provide power for the entire test device, driving the drill pipe 6, the drill collar 9 and the drill bit 12 to rotate; the gear transmission box 2 is fixed on the base 18, and is used to transmit the power of the top drive motor 1; the mud inlet 3 is used to inject mud into the drill pipe 6, the mud outlet 5 is used to discharge the annular mud, the top drive joint 4 is used to connect the drill pipe 6 and the gear transmission box 2, and the first joint 15 is used to connect the drill pipe 6 and the drill collar 9. The second joint 16 is used to connect the drill collar 9 and the downhole tool 11, and the third joint 17 is used to connect the downhole tool 11 and the drill bit 12; the movable clamp 7 can slide left and right on the base 18 to fix the entire casing 8. The pressurized clamp 10 is fixed on the base 18, and is used to apply drilling pressure to the drill bit 12 and fix the casing 8. When the test device starts to work, the pressurized clamp 10 applies a leftward force to the casing 8. Pressure, according to the principle of action force and reaction force, the drill pipe 6 in the casing 8 will apply rightward pressure to the drill bit 12, that is, the pressure on bit.

As shown in Figure 1, when the present invention is in use, at first, from left to right, the drill pipe 6 is connected with the top drive motor 1 with the top drive joint 4 successively, and the drill pipe 6 is connected with the drill collar 9 with the third joint 17. Linked, the drill collar 9 is linked with the downhole tool 11 to be evaluated with the second joint 16, and the downhole tool 11 is linked with the drill bit 12 with the first joint 15; A certain WOB, and a certain amount of mud is pumped from the mud inlet 5; finally, the top drive motor 1 is started, and the rotating drill bit 12 breaks the core 13 in the core groove 14, and the downhole tool 11 is started to work. Efficacy and reliability were evaluated. In addition, during the simulated drilling process of the test device, according to different actual drilling conditions, the mud displacement, the speed of the top drive motor 1 and the drilling pressure applied to the drill bit 12 can be changed to evaluate the performance of the downhole tool 11 under different drilling conditions. Under the work effect and reliability.

Claims (1)

1. it is a kind of evaluate horizontal wells downhole tools reliability experimental rig, it is characterised in that device includes：Top-drive motor (1), Joint (4), slurry outlet (5), drilling rod (6), mobile gripper clamp (7), sleeve pipe are driven in gear (2), mud entrance (3), top (8), drill collar (9), pressurization gripper clamp (10), downhole tool (11), drill bit (12), the first joint (15), the second joint (16), the Three joints (17) and base (18)；Gear (2) is fixed on base (18), for transmitting the power of top-drive motor (1), Mud entrance (3) for the injection mud into drilling rod (6), for discharging annular space mud, drive joint (4) and use slurry outlet (5) by top In jointed rod (6) and gear (2), the first joint (15) is for jointed rod (6) and drill collar (9), the second joint (16) for connecting drill collar (9) and downhole tool (11), the 3rd joint (17) is for connecting downhole tool (11) and drill bit (12)； Mobile gripper clamp (7) can horizontally slip on base (18), for fixing whole sleeve pipe (8)；Pressurization gripper clamp (10) is fixed On base (18), for applying the pressure of the drill and fixed sleeving (8) to drill bit (12)；When experimental rig is started working, by adding Pressure gripper clamp (10) applies pressure to the left to sleeve pipe (8), according to active force and reaction force principle, the drilling rod in sleeve pipe (8) (6) it is the pressure of the drill by the pressure applied to the right to drill bit (12), mud displacement, the rotating speed of top-drive motor (1) can be changed and put on The pressure of the drill on drill bit (12) is evaluating working effect and reliability of the downhole tool (11) under different drilling conditions.