CN104090073B - High temperature leak stopping gelling performance tester - Google Patents

Abstract

The invention provides a high-temperature plugging gel performance tester, which includes a colloid container for storing colloid, the top of the colloid container is provided with a caliper flange, and the bottom is provided with a high-temperature resistant fluorine rubber seal that is in close contact with the inner wall of the colloid container The plug, the caliper flange and the high-temperature-resistant fluorine rubber sealing plug seal the colloid in the colloid container; the bottom of the high-temperature-resistant fluorine rubber sealing plug is vertically connected with a screw rod, and the screw rod is used to drive the high-temperature-resistant fluorine rubber The sealing plug is connected by the lifting mechanism that moves up or down; a gravity sensor is set between the top of the screw rod and the fluorine rubber seal, and a first temperature sensor and a second temperature sensor are respectively set on the side walls of the colloid container. The sensor, the first temperature sensor, the second temperature sensor and the lifting mechanism are all connected with the control system, and the side wall of the colloid container is provided with an air release valve, a heating layer and a heat preservation device. The invention can accurately evaluate the temperature resistance, gel forming property, wall sticking property, expansion property and pressure bearing property of the plugging gel.

Description

High temperature plugging gel performance tester

technical field

The invention relates to the field of oil and gas field drilling fluid plugging formation leakage in the process of petroleum exploration and development, in particular to an instrument capable of simulating the gel state at the formation temperature, which is used to test the gelation and wall adhesion of the gel at the formation temperature , Expansibility, and pressure-bearing high-temperature plugging gel performance tester.

Background technique

Since the birth of the modern petroleum industry, lost circulation (problem) has always been accompanied by the exploration and development of oil and gas, and has had a serious impact on the development of the petroleum industry. Oil workers have been plagued by problems such as increased drilling costs, prolonged construction periods, and increased reservoir pollution caused by lost circulation.

According to foreign statistics, among the losses caused by complex situations in the current drilling downhole: leakage accounts for 58.5%, wellbore instability accounts for 24%, pipe sticking accounts for 3.5%, bit balling accounts for 3.5%, barite settlement accounts for 3.5%, Improper handling of drilling fluids accounted for 3.5%, and losses caused by leakage were the largest. Therefore, solving the problem of wellbore leakage will have great positive significance for us to save costs and accelerate cost recovery during the drilling process, ensure the safety of drilling construction and the development and application of new technologies. Through the analysis of different types of lost circulation and the methods of dealing with lost circulation, it is found that gel, as a high-quality and efficient plugging slurry, is more and more widely used to plug malignant formations. In order to effectively improve the success rate of gel in plugging malignant formation leakage, it is necessary (guaranteed) that the gel has good temperature resistance, gelation, wall adhesion, expansion and pressure bearing properties, so as to achieve gel Anti-shock, stop and fill, high strength and other plugging performance requirements. At present, there is no relevant instrument that can accurately evaluate all the above-mentioned core properties required for plugging gel.

Contents of the invention

The purpose of the present invention is to solve the above-mentioned defects in the prior art, and to provide a high-temperature plugging system capable of evaluating the temperature resistance, gelation, wall adhesion, expansibility, and pressure-bearing properties of the gelled state of the gel at the formation temperature. Leakage Gel Performance Tester.

A high-temperature plugging gel performance tester, comprising a colloid container for storing colloid, the top of the colloid container is provided with a caliper flange, the bottom is provided with a high-temperature resistant fluorine rubber sealing plug that is in close contact with the inner wall of the colloid container, and the caliper The flange and the high-temperature-resistant fluorine rubber sealing plug seal the colloid in the colloid container; the bottom of the high-temperature-resistant fluorine rubber sealing plug is vertically connected with a screw rod, and the screw rod is used to drive the high-temperature-resistant fluorine rubber sealing plug. The lifting mechanism that moves or moves down is connected; a gravity sensor is arranged between the top of the screw rod and the high temperature resistant fluorine rubber seal, and a first temperature sensor and a second temperature sensor are respectively arranged on the side walls of the colloid container, and the gravity sensor , the first temperature sensor, the second temperature sensor, and the lifting mechanism are all connected to the control system, and the side wall of the colloid container is provided with an air release valve, a heating layer and a heat preservation device.

Further, in the above-mentioned high-temperature plugging gel performance tester, a pressure gauge is arranged on the flange of the caliper.

Further, in the above-mentioned high-temperature plugging gel performance tester, the heating layer and the heat preservation device use a crawler heater as a heat source, and are equipped with heat preservation materials and a casing.

Further, in the above-mentioned high-temperature plugging gel performance tester, the safety pressure of the air release valve is 0.3Mpa, and the pressure is released automatically when it exceeds this pressure.

Furthermore, in the high-temperature plugging gel performance tester described above, the measuring range of the first temperature sensor 3 and the second temperature sensor 6 is 0-300°C, the measurement accuracy is 0.1°C, and the material is stainless steel.

The high-temperature plugging gel performance tester provided by the invention can evaluate the temperature resistance, gelation, wall adhesion, expansion and pressure-bearing properties of the plugging gel, and solves the problem of plugging in the drilling process. Accurate evaluation of gel performance in formation malignant leakage: 1) The actual state of the gel (gel temperature resistance, gelation and wall-hanging property) at the formation temperature; 2) The gel performance at different temperatures Gel-forming time and pressure-bearing strength; 3) Changes in the pressure-bearing capacity of the gel after heating for different times; 4) Volume expansion of the gel at different temperatures. Through the measurement data of this instrument, the pressure value that the gel injected into the leakage layer can be sealed can be analyzed, and the existence state of the downhole gel (such as temperature resistance, expansion, gelation and wall-hanging property, etc.) can be judged. The feasibility of glue plugging provides an experimental basis.

Description of drawings

Fig. 1 is a schematic structural diagram of a high-temperature plugging gel performance tester of the present invention.

detailed description

In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are part of the embodiments of the present invention , but not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Fig. 1 is a schematic structural view of the high-temperature plugging gel performance tester of the present invention, as shown in Fig. 1, the high-temperature leak-stopping gel performance tester provided by the present invention includes a colloid container 2 for storing colloid, and the colloid container The top of 2 is provided with a caliper flange 9, and the bottom is provided with a high-temperature-resistant fluorine rubber sealing plug 8 that is in close contact with the inner wall of the colloid container 2. The caliper flange 9 and the high-temperature-resistant fluorine rubber sealing plug 8 seal the colloid in the colloid container 2 Inside; the bottom of the high-temperature-resistant fluorine rubber sealing plug 8 is vertically connected with a screw mandrel, and the screw mandrel is connected with the lifting mechanism 7 for driving the high-temperature-resistant fluorine rubber sealing plug to move up or down; the top of the screw mandrel is connected with the A gravity sensor 5 is arranged between the high-temperature-resistant fluorine rubber seals 8, and a first temperature sensor 3 and a second temperature sensor 6 are respectively arranged on the side walls of the colloid container 2. The gravity sensor 5, the first temperature sensor 3, and the second temperature sensor The temperature sensor 6 and the lifting mechanism 7 are all connected with the control system, and the side wall of the colloid container 2 is provided with an air release valve, a heating layer and a thermal insulation device 4 .

The high-temperature plugging gel performance tester provided by the invention can evaluate the temperature resistance, gel-forming property, wall-sticking property, expansibility and pressure-bearing property of the plugging gel.

Further, a pressure gauge 1 is provided on the caliper flange 9 . The heating layer and heat preservation device use crawler heaters as heat sources, and are equipped with heat preservation materials and shells. The safety pressure of the air release valve is 0.3Mpa, and the pressure is released automatically when it exceeds this pressure. The measuring range of the first temperature sensor 3 and the second temperature sensor 6 is 0-300°C, the measurement accuracy is 0.1°C, and the material is stainless steel.

Described deflation valve is on the side wall of container, and its safety pressure is 0.3Mpa, exceeds this pressure and can release pressure, guarantees safety; The size of described colloid container 2 is inner diameter 7in, high 100cm. The heating and heat preservation device 4 uses a crawler heater as a heat source, is equipped with heat preservation materials and a shell, and has a maximum working temperature of 750°C. The gravity sensor 5 is a load cell with a maximum measuring range of 2t. The lifting mechanism 7 adopts a square worm gear screw structure, the lifting is relatively stable, the lifting speed can be set, and the driver is selected for use by a servo motor for preparation. The high-temperature-resistant fluorine rubber sealing plug 8 can withstand high temperature and ensure close contact with the inner cavity under the condition of isolating temperature. The inner cavity of the colloid container 2 is made of SUS304 stainless steel, the outside is heated by a heating wire, and the outermost part is kept insulated by using a heat-insulating material with good performance.

Example 1:

This example evaluates the ability of the gel to withstand pressure at 140°C.

① Turn on the device start button, open the caliper flange 9, and inject the prepared gel solution into the gel container 2. Seal the caliper flange 9 and close the air release valve. The heating temperature of the heating layer of the colloid container 2 is set to 140° C. by the control system;

② Monitor the temperature of the colloid in the colloid container 2 through the first temperature sensor 3 and the second temperature sensor 6, and observe the heating time and the actual heating temperature through the control system;

③ After the heating time is reached, open the vent valve to release the gas to prevent the internal gas back pressure from affecting the experimental results and prevent the experimenters from being burned by the high-temperature gas;

④ Open the lifting mechanism 7 through the control system, the screw rod connected with the lifting mechanism 7 starts to rise, start to monitor the pressure data transmitted from the gravity sensor 5 through the control system, and automatically generate the curve about pressure and temperature changing with time through the controller; Observe the pressure-time curve of the gel, and the reading when the pressure value reaches the maximum is the maximum pressure bearing value of the gel;

⑤After obtaining the reading, copy the experimental data from the instrument, then lower the lifting mechanism through the control system, and finally take out the high-temperature resistant fluorine rubber sealing plug 8 to discharge the colloid.

Example 2:

In this example, the length of the tongue sticking out of the gel is analyzed at 150°C, and its adhesion to the wall is tested.

① Turn on the device start button, open the caliper flange 9, and inject the prepared gel solution into the gel container 2. Seal the caliper flange 9 and close the air release valve. Set the heating temperature of the gel to 150°C through the control system;

② Monitor the temperature of the colloid in the cavity of the colloid container 2 through the first temperature sensor 3 and the second temperature sensor 6 . Observe the heating time and actual heating temperature through the control system;

③ After the heating time is reached, open the vent valve to release the gas to prevent the internal gas back pressure from affecting the experimental results and prevent the experimenters from being burned by the high-temperature gas;

④Click the device off button to turn off the device. After cooling, control the lifting mechanism to descend through the control system, and finally take out the high-temperature resistant fluorine rubber sealing plug 8, measure the tongue-out length of the colloid with a caliper and record L1;

⑤After the data collection is finished, open the caliper flange 9 on the top of the container 2, press the gel from the upper part, and discharge the gel from the bottom of the colloid container 2. (The gel is discharged from the bottom of the container 2, and the length of the tongue is measured from the bottom surface of the container bottom to the length of the top after the gel sags)

Example 3

This example evaluates the change of the compressive strength of the gel during heating at 150°C for 10 hours (the change of the compressive strength of the gel with time is measured, which characterizes the change of the compressive strength with time).

① Turn on the device start button, open the caliper flange 9, and inject the prepared gel solution into the gel container 2. Seal the caliper flange 9 and close the air release valve. Set the heating temperature of the gel to 150°C through the control system;

② Monitor the temperature of the colloid in the cavity of the colloid container 2 through the first temperature sensor 3 and the second temperature sensor 6 . Observe the heating time and actual heating temperature through the control system;

③ After the heating time is reached, open the vent valve to release the gas to prevent the internal gas back pressure from affecting the experimental results and prevent the experimenters from being burned by the high-temperature gas;

④ After heating for 1 hour, control the lifting mechanism to rise through the control system, and then obtain the pressure data from the gravity sensor 5 on the screw rod connected to the lifting mechanism, and automatically generate data about pressure and temperature; observe the pressure-time curve, The reading when the pressure value reaches the maximum is the colloid pressure value P1 after heating for 1 hour;

⑤Repeat steps ③～④, and test the gel pressure value P2～P10 for each hour in the next 2h～10h respectively. After obtaining the data, organize and analyze the change of the pressure value over time.

⑥ Control the lifting mechanism 7 to descend through the control system, take out the high-temperature resistant fluorine rubber sealing plug 8, and discharge the colloid.

Example 4:

This example evaluates the gel swell test at 160°C.

① Turn on the device start button, open the caliper flange 9, and inject the prepared gel solution into the gel container 2. Use a caliper to measure the distance between the liquid level and the top of the colloid container 2, and record L1;

②Seal the caliper flange 9 and close the air release valve. Control the gel heating temperature to 160°C through the control system;

③ Monitor the temperature of the colloid in the cavity of the colloid container 2 through the first temperature sensor 3 and the second temperature sensor 6 . Observe the heating time and actual heating temperature through the control system;

④ After the heating time is reached, open the vent valve to deflate to prevent the internal high-temperature gas from burning the experimenters;

⑤Click the device off button to turn off the device. After the gel is cooled, open the top caliper flange 9, measure the distance from the expanded rubber surface to the top of the gel container 2 again with a caliper, and record L2;

⑥ Obtain the rising distance of the colloid surface in the container 2, and calculate the colloid expansion volume V1 through the diameter of the colloid container 2;

⑦After the experiment, control the lifting mechanism to descend through the control system, and then take out the high-temperature-resistant fluorine rubber sealing plug 8 to discharge the colloid.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims (5)

1. a high temperature leak stopping gelling performance tester, it is characterized in that, comprise the gel container (2) for storing colloid, the top of described gel container (2) is provided with clamp flange (9), bottom is provided with the thermostable fluorine glue sealing-plug (8) with gel container (2) inwall close contact, and colloid is sealed in described gel container (2) by clamp flange (9) and thermostable fluorine glue sealing-plug (8), the bottom vertical of described thermostable fluorine glue sealing-plug (8) is connected with screw mandrel, described screw mandrel with for driving the elevating mechanism (7) that thermostable fluorine glue sealing-plug moves or moves down to be connected, gravity sensor (5) is provided with between described screw mandrel top and thermostable fluorine glue sealing-plug (8), the sidewall of gel container (2) is respectively arranged with the first temperature sensor (3), second temperature sensor (6), described gravity sensor (5), first temperature sensor (3), second temperature sensor (6), elevating mechanism (7) is all connected with control system, the sidewall of gel container (2) is provided with air release, zone of heating and attemperator (4), elevating mechanism (7) adopts square worm gear screw structure, described gravity sensor (5) maximum range is the LOAD CELLS of 2t.

2. high temperature leak stopping gelling performance tester according to claim 1, is characterized in that, described clamp flange (9) is provided with tensimeter (1).

3. high temperature leak stopping gelling performance tester according to claim 1, is characterized in that, described zone of heating and attemperator adopt tracklayer heater to make thermal source, are equipped with insulation material and shell.

4. high temperature leak stopping gelling performance tester according to claim 1, it is characterized in that, the safe pressure of described air release is 0.3Mpa, exceedes this pressure releasing pressure automatically.

5. high temperature leak stopping gelling performance tester according to claim 1, it is characterized in that, the range ability of described first temperature sensor (3), the second temperature sensor (6) is 0 ~ 300 DEG C, and measuring accuracy is 0.1 DEG C, and material is stainless steel.