CN205314989U - It plans experimental apparatus to be applicable to deep well high temperature fluid slug well completion well tube formwork - Google Patents

Abstract

The utility model discloses a wellbore simulation experiment device suitable for deep well high-temperature fluid slug completion, which mainly consists of a high-pressure gas cylinder, a pressure control system, an injection system, an experimental pipe section, a simulated drill string, a heating and temperature control system, a flow meter, and waste liquid The tank consists of a high-pressure gas cylinder connected to a pressure control system, and the pressure control system is connected to the injection system and both ends of the experimental pipe section. The injection system includes a mud transparent tank, a gel breaker transparent tank, and a jelly transparent tank. The experimental pipe section is placed vertically. The system is connected, and its upper end is connected to the flow meter and the waste liquid tank through pipelines. There is a simulated drill string inside the experimental pipe section, and a heating and temperature control system outside. Both ends of the experimental pipe section are connected to pressure gauges. The utility model is reliable in principle and easy to operate, and can simulate drilling fluid circulation, high-temperature fluid slug injection, gelation process detection, pressure test, gel breaking, etc., and provides reliable analysis data for gel valve screening and field use.

Description

Applicable to deep well high temperature fluid slug completion wellbore simulation experiment device

technical field

The utility model relates to the field of oil and natural gas experiment equipment, in particular to a wellbore simulation experiment device suitable for high-temperature fluid slug completion in deep wells.

Background technique

The high-temperature fluid slug is a kind of intelligent chemical colloid used in underbalanced well completion. It forms a high-viscosity semi-solid colloid slug with certain compression resistance in the casing, which has the functions of "isolation, sealing and pressure bearing". effect. However, because the performance of high-temperature fluid slugs depends on the gel system selected, there is a lack of understanding of the mechanical properties of high-temperature fluid slugs in complex well environments, and it is necessary to carry out detailed research work. But at present there is no set of simulation equipment that can complete the actual use of the fluid slug jelly valve under high temperature and high pressure conditions. Therefore, the utility model proposes a high temperature fluid slug wellbore simulation experiment device, which can simulate drilling fluid circulation, High-temperature fluid slug injection, gelation process detection, pressure test, gel breaking, etc., analyze the actual use of the gel valve in the field, and provide reference for the field use process of the gel valve.

Utility model content

The purpose of this utility model is to provide a wellbore simulation experiment device suitable for deep well high-temperature fluid slug completion. The device is reliable in principle and easy to operate. Gel breaking, etc., to provide reliable analysis data for the screening and field use of gel valves.

In order to achieve the above technical objectives, the utility model provides the following technical solutions.

It is suitable for the wellbore simulation experiment device of high temperature fluid slug completion in deep well. The high-pressure gas cylinder is connected to a pressure control system, and the pressure control system is connected to the injection system and both ends of the experimental pipe section. The injection system includes a transparent tank for mud, a transparent tank for a gel breaker, and a transparent tank for jelly. glue, jelly collagen solution, and inject the three kinds of solutions into the experimental pipe section through the pressure control system. There is a simulated drill string, a heating and temperature control system on the outside, and pressure gauges are connected to both ends of the experimental pipe section.

The pressure control system, heating and temperature control system, flowmeter and pressure gauge are all connected with the computer.

The pressure control system divides the high-pressure gas source provided by the high-pressure gas cylinder to both ends of the injection system and the experimental pipe section, and controls the pressure of each access point, that is, the pressure control system can control the three injection systems through the internal chip. Feedback and adjust the pressure at the transparent tank of the main body, the experimental pipe section, the simulated drill string, etc.

The experimental pipe section is a temperature-resistant and pressure-resistant glass tube, which can withstand 0.6MPa high pressure and withstand 150° high temperature. Its transparent characteristics are convenient for observing experimental phenomena, and can more intuitively grasp the gelling and breaking of high-temperature slugs. a series of processes.

The heating and temperature control system includes an electric heating wire and an insulating layer. The electric heating wire is wound on the outer wall of the experimental pipe section, and the insulating layer is wrapped on the outer wall of the experimental pipe section. The insulating layer is a transparent insulating material that does not affect visibility. The heating passes through the temperature control circuit automatic control.

The simulated drill string is connected to the injection system. The simulated drill string is closed at the lower end and drilled with three pipes with a diameter of 10 mm. It can simulate the effect of injecting the gel in the drill string in the well, and analyze the outflow from the drill bit water hole. The reunion of the jelly in the annular space.

The flow meter is used to measure the liquid discharged from the test pipe section.

The waste liquid tank is used to collect the waste liquid discharged from the experimental pipe section.

Description of drawings

Fig. 1 is a schematic structural diagram of a wellbore simulation experiment device suitable for high-temperature fluid slug completion in deep wells.

In the figure: 1. High-pressure gas cylinder, 2. Pressure control system, 3. Transparent mud tank, 4. Transparent tank of gel breaker, 5. Transparent tank of jelly, 6, 10. Pressure gauge, 7. Simulated drill string, 8 .Heating and temperature control system, 9. Experimental pipe section, 11. Flow meter, 12. Waste liquid tank, V1, V2, V3, V4, V5, V6 are all valves.

detailed description

Below in conjunction with accompanying drawing, the utility model is further described.

See Figure 1.

Suitable for high-temperature fluid slug completion wellbore simulation experiment device in deep well, mainly composed of high-pressure gas cylinder 1, pressure control system 2, injection system, experimental pipe section 9, simulated drill string 7, heating and temperature control system 8, flow meter 11, waste Liquid tank 12 is formed, and described high-pressure cylinder 1 is connected pressure control system 2, and described pressure control system 2 is connected injection system and experiment pipe section 9 two ends, and described injection system comprises mud transparent tank 3, gel breaker transparent tank 4, The jelly transparent tank 5 is respectively configured to contain mud, gel breaker, and jelly collagen solution. The test pipe section 9 is vertically placed, and its lower end is connected to the injection system, and its upper end is connected to the flow meter 11 and the waste liquid tank 12 through pipelines , there is a simulated drill string 7 inside the test pipe section, and a heating and temperature control system 8 outside, and pressure gauges 6 and 10 are connected to both ends of the test pipe section; Meters 6 and 10 are all connected to the computer.

Using the above-mentioned device to carry out the wellbore simulation experiment of high-temperature fluid slug completion in deep wells, the steps are as follows:

(1) Observation of gelling effect:

After the experiment preparation is completed, follow the steps below to implement

1. Open the passage valve V3 of the mud container, and pump the mud into the experimental pipe section 20cm. Then close the valve V3;

2. Open the access valve V5 of the jelly container, and pump the jelly collagen solution into the experimental pipe section 130cm. Close access valve V5;

3. Open the passage valve V3 of the mud container, pump the mud into the remaining 20cm of the experimental pipe section, and keep the passage valve V3 open.

4. Close the upper valve V6 of the experimental pipe section 9, and adjust the heating and temperature control system to 130°C;

5. Start to record the time, observe the gelling process, and measure the length of the mixing section. If the mixing section is long, it means that the mud is not good for the gelling. If the mixing section is short or even 0, it means that the gelling effect is good.

(2) Mechanical stability experiment

1. After the jelly valve is formed, gradually increase the output pressure value of the high-pressure gas cylinder 1 until the colloid is broken, and obtain the highest withstand pressure value through pressure measurement and records. Further reduce the maximum pressure value to obtain a stable withstand voltage value that can be stabilized for 5 hours.

2. If the injection pressure reaches 0.5MPa and the jelly is still not broken, then stabilize the pressure for 5 hours.

3. If the colloid has slipped without being broken, calculate the difference between the pressure gauges V6 and V1 at both ends of the test pipe section 9 through pressure measurement, that is, the pressure difference, evaluate its sliding resistance, and divide the liquid flow out of the test pipe section by The sliding velocity is obtained from the flow channel area of the experimental pipe section. The greater the sliding velocity, the worse the mechanical stability of the jelly valve; The better the stability.

(3) Gas intrusion stability test

1. After the jelly valve is formed, close the upper valve V6 of the experimental pipe section 9, set the temperature of the temperature control system 8 to 130°C, open the valve V1 during the gelation process, inject air bubbles into the experimental pipe section 9, and observe its impact on the jelly valve. Influenced by the strength, the gelling effect is poor after the air bubbles are injected, and the obvious mixing of the slurry indicates that the air intrusion stability is poor.

2. After the jelly valve is formed, open the valve V1 to fill the bottom of the test pipe section 9 with gas, observe the gas intrusion sealing performance of the colloid in the case of gas intrusion, gradually increase the pressure, and observe the influence of the gas on the integrity of the jelly valve , to obtain the gas intrusion stability.

(4) Gel breaking test

1. After the gel is formed, the natural gel breaking time or the pressure-time curve can be measured through the records of the pressure gauge 10. The maximum pressure of the gel breaking can be read from the curve, and the maximum withstand pressure value of the gel valve can be obtained.

2. After gelling, open the valve V6 on the upper part of the experimental pipe section, lower the simulated drill string 7, close the valve V1, open the valve V2, inject the gel breaker, observe the disintegration of the gel plug, the faster the gel plug breaks, the gel breaker The better the gel breaking effect on the gel valve.

(5) Influence of injection of jelly collagen solution from the simulated drill string on the gelation effect

Observe the gelling effect of the jelly gel after injection from the simulated drill string, and measure the length of the slurry mixing section. If the slurry mixing section is long, it means that the jelly reuniting effect through the lower hole of the simulated drill string into the experimental pipe section is poor.

Claims (4)

1. Suitable for deep well high temperature fluid slug completion wellbore simulation experiment device, mainly composed of high pressure gas cylinder (1), pressure control system (2), injection system, test pipe section (9), simulated drill string (7), heating and Temperature control system (8), flow meter (11), waste liquid tank (12), it is characterized in that, described high pressure cylinder (1) connects pressure control system (2), and described pressure control system (2) connects The two ends of the injection system and the test pipe section (9), the injection system includes a mud transparent tank (3), a gel breaker transparent tank (4), and a jelly transparent tank (5), respectively configuring and holding the mud and the gel breaker , jelly collagen solution, the test pipe section (9) is placed vertically, its lower end is connected with the injection system, its upper end is connected with the flow meter (11) and the waste liquid tank (12) through pipelines, and there is a simulated drill string (7) inside the test pipe section ), there are heating and temperature control systems (8) outside, and the two ends of the test pipe section are connected with pressure gauges (6), (10); the pressure control system (2), heating and temperature control system (8), flowmeter ( 11), manometer (6), (10) are all connected computer. 2. The wellbore simulation experiment device suitable for high-temperature fluid slug completion in deep wells as claimed in claim 1, wherein the test pipe section is a temperature-resistant and pressure-resistant glass tube, which can withstand 0.6MPa high pressure and withstand 150° high temperature at the same time . 3. The wellbore simulation experiment device suitable for high-temperature fluid slug completion in deep wells as claimed in claim 1, wherein the heating and temperature control system includes an electric heating wire and an insulating layer, and the electric heating wire is wound on the outer wall of the experimental pipe section, and the heat preservation Layer wrapped around the outer wall of the experimental pipe section. 4. as claimed in claim 1, be applicable to deep well high-temperature fluid slug completion wellbore simulation experiment device, it is characterized in that, described simulation drill string is connected with injection system, and simulation drill string is that the lower end is closed and has three diameters of 10 mm bore pipe.