CN106368645B - The Construction Method of Pressure Lifting and Lowering of Temperature Measuring Cable in SAGD Well - Google Patents

Abstract

The invention discloses a construction method for pressure lifting and lowering of a temperature measuring cable in a SAGD well. It includes the following steps: temperature measurement cable is pressed down into the well: install and fasten the fan-shaped end of the I-shaped flange with the wellhead; install and fasten the temperature measurement cable with pressure lift and lower sealing device; Put the packing into the box, and press the packing with the gland of the packing box, observe whether the packing is well sealed with the temperature measuring cable, then open the thermal mining gate valve, and press the temperature measuring cable from the temperature measuring cable belt through the injection device The top of the sealing device is introduced until the design temperature measurement depth is reached; after the temperature measurement cable is lowered to the design position, the temperature measurement cable is pressed and lifted by the grease injection machine, and the grease injection valve of the grease injection sealer of the lower sealing device is injected with grease to realize the measurement Sealing of the temperature cable: After the pressure is released through the pressure relief valve, the packing is removed, and then the packing gland, packing box, and pressure relief flange are respectively removed from the upper end of the temperature measuring cable and the upper end of the lower sealing device by lifting the clamp and a hydraulic sealer, and finally a wellhead static sealing device is installed to seal the wellhead and the temperature measuring cable; the invention effectively reduces pollution and protects the environment.

Description

The Construction Method of Pressure Lifting and Lowering of Temperature Measuring Cable in SAGD Well

technical field

The invention relates to a construction method, in particular to a construction method for a SAGD well temperature measuring cable to be lifted and lowered under pressure.

Background technique

At present, when lifting and lowering the temperature measuring device in a SAGD well, it is necessary to stop the pumping and injection of the production well first, wait for the temperature and pressure of the production well to drop, and then use the pump truck and water truck to carry out the well killing operation. Open the wellhead test pipeline to carry out the lifting and lowering construction of the temperature measuring cable. SAGD downhole temperature test routine lifting and running operations will use high-density well killing hydraulic wells or blowout means to reduce the downhole pressure of the oil well before operating the oil well. High-density well killing hydraulic wells are not only costly and time-consuming, but also block underground oil and water channels, affecting oil production and steam injection effects. If spraying is used to lower the pressure, it will not only greatly reduce the formation energy, but also bring immeasurable losses to subsequent production, and also cause environmental pollution. Problems existing in the non-pressure lifting and lower temperature measuring device:

1. Affect the normal production cycle of production oil wells and reduce production.

2. Once the killing fluid volume is too large during the well killing process, it will affect the fluctuation of the oil production liquid level. In severe cases, the oil production well cannot be produced and needs to be re-operated.

3. Waste of resources, at least two to three trucks of water or concentrated brine are needed for each kill; concentrated brine corrodes metals at high temperatures.

Contents of the invention

The present invention aims at the above problems and provides a structure that is reasonable, does not need to shut down the well to release pressure and cool down, realizes dynamic sealing, shortens the construction period; Environmental SAGD well temperature measurement cable belt pressure lift, down construction method.

The technical scheme that the present invention solves technical problem is: the construction method of SAGD well temperature-measuring cable belt pressure lifting, lowering, comprises the following steps:

1. Temperature measurement cable pressure downhole:

Step 1) Fit the fan-shaped end of the I-shaped flange of the temperature measuring cable with the pressure lifting and lower sealing device with the wellhead, and then install and fasten it;

Step 2) Install the thermal recovery gate valve again, and install the grease injection sealer, hydraulic blowout preventer, pressure relief flange, packing box and packing gland on the thermal recovery gate valve in sequence until the temperature measuring cable is pressed The lifting and lower sealing devices are all installed and fastened;

Step 3) Put the packing into the packing box, and press the packing with the gland of the packing box, observe whether the packing is sealed with the temperature measuring cable, then open the thermal recovery gate valve 2, and inject the temperature measuring cable from the measuring cable through the injection device. The temperature cable is lifted by pressure, and the top of the lower sealing device is introduced until the design temperature measurement depth is reached;

Step 4) After the temperature measuring cable is lowered to the design position, inject grease into the grease injection valve of the grease injection sealer of the temperature measuring cable belt pressure lifting and lower sealing device through the grease injection machine to realize the sealing of the temperature measuring cable;

Step 5) After the pressure is released through the pressure relief valve, remove the packing, and then remove the packing gland, packing box, pressure relief flange and hydraulic pressure from the upper end of the temperature measuring cable and the lower sealing device by using the lifting clamp. Dynamic sealer, and finally install the wellhead static sealing device to seal the wellhead and temperature measuring cable;

2. The temperature measuring cable brings up the wellhead under pressure:

Step 1) Inject grease into the grease injection valve of the grease injection sealer through the grease injection machine to realize the sealing of the temperature measuring cable;

Step 2) Remove the wellhead static sealing device by cooperating with the crane to lift the clamp, and install the hydraulic sealer, pressure relief flange, packing box and packing gland on the grease sealer in sequence, and tighten them tightly. fixed;

Step 3) Lift the temperature measuring cable into the grease injection sealer through the temperature measuring cable lifting device, and close the thermal mining gate valve;

Step 4) After releasing the pressure through the pressure relief valve, take out the packing in the packing box, and lift out all the temperature measuring cables;

Step 5) Remove the packing box, pressure relief flange, hydraulic blowout preventer and grease sealer in sequence, and finally install the wellhead static sealing device again to seal the wellhead.

Before step 1), it is necessary to confirm that the wellhead pressure is not higher than 5MPa and the temperature is not higher than 300°C. The steam injection wells within 100 meters around are required to stop injection to ensure that the pressure and temperature of the construction wells are stable.

The pressure-lifting and lower sealing device of the temperature-measuring cable is that one end flange of the I-shaped flange matched with the wellhead, the other end flange of the I-shaped flange is fixedly connected with the one end flange of the thermal recovery gate valve, and the other end flange of the thermal recovery gate valve is It is fixedly connected with one end flange of the grease injection sealer, the other end flange of the grease injection sealer is fixedly connected with the one end flange of the hydraulic blowout preventer, and the other end flange of the hydraulic blowout preventer is connected with the series pressure relief method One end flange of the flange and the packing box is fixedly connected, and the other end of the packing box is threadedly connected with the packing gland. There are sealing steel rings between the dynamic blowout preventer and the hydraulic blowout preventer and the pressure relief flange, and between the pressure relief flange and the packing box.

The axial center of the grease injection sealer is respectively provided with a pipe sleeve, a grease injection pressure sleeve and a grease injection positioning nut from top to bottom, and the axial center of the three is equipped with a diameter matching temperature measuring cable. through holes.

At least one grease injection valve is provided at the transverse centerline of the pipe sleeve, and the grease injection valve is fixedly connected to the grease injection sealer.

A pressure relief valve is provided in the transverse middle of the pressure relief flange.

The axial center of the packing box is respectively provided with a centralizer positioning nut, a washer, a centralizer, a tower-type packing and a packing fixed block from bottom to top.

A centralizer is also provided at the axial center of the packing gland and is in contact with the packing.

The centralizer is two arc-shaped rings with inner and outer layers, and the middle parts of the two arc-shaped rings are dislocated and overlapped to form a circle.

The hydraulic blowout preventer is controlled by a hydraulic pump station at a distance of more than 10 meters.

Compared with the prior art, the present invention has the following advantages and effects:

The invention does not need to shut down the well to depressurize and cool down, can shorten the construction period, and reduces the cost of well-killing fluid and ground construction equipment required for conventional operations. The tower packing seal is adopted to realize the dynamic sealing when the temperature measuring cable is lifted and lowered under pressure. After the temperature measuring cable is driven into the oil well under pressure, the grease injection method is used to realize the wellhead sealing construction under pressure. When the temperature measuring cable is lifted and lowered under pressure, once the dynamic seal fails, the distance between the hydraulic pump station and the hydraulic blowout preventer is 15 meters. In case of emergency, the hydraulic blowout preventer can be activated in time to seal the temperature measuring device , to achieve wellhead blowout prevention.

In addition, the present invention does not have external fluid intrusion, and the oil and gas layers will not be damaged by external solid phases, liquid phases, and gas phases, and new interlayer contradictions will not occur, the formation pressure system will not be damaged, and there is no need to re-establish balance, which is beneficial to oil wells Stable and high production after restoration; Compared with the operation of the traditional lifting and lowering temperature testing device, it works under pressure without blowout or overflow, and does not need pressure relief, well killing and other operations for a single well. It reduces costs, effectively reduces pollution, protects the environment, and keeps the formation pressure system of the entire injection-production network undamaged, without the need to establish pressure balance. It plays a huge role in ensuring oil well production and improving gas injection timeliness. The invention has simple structure, strong versatility, and better economic and social benefits.

The belt operation of the present invention can produce following remarkable comprehensive benefits:

1. Protect the production layer and improve the utilization rate of reserves (recovery rate);

2. Realize zero pollution and prolong the production cycle of oil and gas wells;

3. Protect the environment, save energy and reduce emissions, and achieve zero emissions;

4. Saving the cost of capacity recovery;

5. Save the cost of killing fluid;

6. Non-stop production operations;

7. Shorten the comprehensive operation period.

Description of drawings

Fig. 1 is the front view structure schematic diagram of the present invention;

Fig. 2 is the schematic diagram of the front view structure of the centralizer of the present invention;

Fig. 3 is a top view structural schematic diagram of the centralizer of the present invention;

The main parts in the figure: I-shaped flange 1, thermal recovery gate valve 2, grease injection positioning nut 3, hydraulic blowout preventer 4, grease injection valve 5, grease injection sealer 6, sealing steel ring 7, hydraulic blowout preventer 8, pressure relief flange 9, centralizer positioning nut 10, gasket 11, centralizer 12, temperature measuring cable 13, packing gland 14, packing 15, packing box 16, pressure relief valve 17, sleeve 18.

Detailed ways

The present invention will be further described in detail below in conjunction with specific examples, but the protection scope of the present invention is not limited by the specific examples, and the claims shall prevail. In addition, on the premise of not violating the technical solution of the present invention, any modification or change made to the present invention that can be easily realized by those skilled in the art will fall within the scope of the claims of the present invention.

Example 1:

As shown in Figures 1, 2, and 3, the construction method of the temperature measuring cable belt pressure lifting and lowering of the SAGD well includes the following steps:

1. The temperature measuring cable 13 goes downhole under pressure:

Step 1) Install and fasten the fan-shaped end of the I-shaped flange 1 in the temperature measuring cable belt pressure lifting and lower sealing device to the wellhead;

Step 2) Install the thermal mining gate valve 2 again, and install the grease injection sealer 6, the hydraulic blowout preventer 8, the pressure relief flange 9, the packing box 16 and the packing gland 14 on the thermal mining gate valve 2 in sequence, Until the temperature measuring cable is pressed and lifted, and the lower sealing device is completely installed and fastened;

Step 3) Put the packing into the packing box, and press the packing with the gland of the packing box, observe whether the packing is sealed with the temperature measuring cable, then open the thermal mining gate valve 2, and inject the temperature measuring cable 13 from the The temperature measurement cable is lifted by pressure, and the top of the lower sealing device is introduced until the design temperature measurement depth is reached. During the lowering process, the lowering speed is controlled to prevent breaking when encountering obstacles. After encountering obstacles, it is slowly lifted up for a certain distance before lowering;

Step 4) After the temperature measurement cable 13 is lowered to the designed position, inject grease into the grease injection valve 5 of the grease injection sealer 6 of the temperature measurement cable belt pressure lifting and lower sealing device through the grease injection machine to realize the sealing of the temperature measurement cable 13 ;

Step 5) After releasing the pressure through the pressure relief valve 17, remove the packing, and then remove the packing gland 14, packing box 16, and pressure relief method respectively from the temperature measurement cable belt pressure lift and the upper end of the lower sealing device by lifting clips. Lan 9 and hydraulic sealer 8, and finally install the wellhead static sealing device to seal the wellhead and temperature measuring cable 13;

2. The temperature measuring cable brings up the wellhead under pressure:

Step 1) inject grease into the grease injection valve 5 of the grease injection sealer 6 through the grease injection machine to realize the sealing of the temperature measuring cable 13;

Step 2) Remove the wellhead static sealing device by cooperating with the crane to play the elevator, and install the hydraulic sealer 8, the pressure relief flange 9, the packing box 16 and the packing gland on the grease injection sealer 6 in sequence 14, and fastened;

Step 3) Lift the temperature measuring cable 13 into the grease injection sealer 6 through the temperature measuring cable lifting device, and close the thermal mining gate valve 2;

Step 4) After releasing the pressure through the pressure relief valve 17, take out the packing 15 in the packing box 16, and lift out all the temperature measuring cables 13;

Step 5) Remove the packing box 16, pressure relief flange 9, hydraulic blowout preventer 8 and grease injection sealer 6 in sequence, and finally install the wellhead static sealing device again to seal the wellhead.

Before the above step 1), it is necessary to confirm that the wellhead pressure is not higher than 5MPa, the temperature is not higher than 300°C, and the steam injection wells within 100 meters around are required to stop injection to ensure that the pressure and temperature of the construction wells are stable.

The above-mentioned pressure-lifting and lower sealing device of the temperature-measuring cable is that the flange at one end matches the wellhead. The flange is fixedly connected to one end flange of the grease injection sealer 6, the other end flange of the grease injection sealer 6 is fixedly connected to the one end flange of the hydraulic blowout preventer 8, and the other end flange of the hydraulic blowout preventer 8 It is fixedly connected with the pressure relief flange 9 in series and one end flange of the packing box 16, and the other end of the packing box 16 is threadedly connected with the packing gland 14, and the I-shaped flange 1 is connected with the thermal recovery gate valve 2 and the thermal recovery gate valve 2 and the grease injection sealer 6, the grease injection sealer 6 and the hydraulic blowout preventer 8, and the hydraulic blowout preventer 4 and the pressure relief flange 9, and the pressure relief flange 9 and the packing box 16 are all provided with seals steel ring7.

The axial center of the above-mentioned grease injection sealer 6 is respectively provided with a pipe sleeve 18, a grease injection pressure sleeve 4 and a grease injection positioning nut 3 from top to bottom, and the axial center of the three is provided with a temperature measuring cable. 13 diameter adapted through holes.

At least one grease injection valve 5 is provided at the transverse centerline position of the above-mentioned pipe sleeve 18 , and the grease injection valve 5 is fixedly connected to the grease injection sealer 6 .

A pressure relief valve 17 is provided in the transverse middle of the above pressure relief flange 9 .

A centralizer positioning nut 10, a washer 11, a centralizer 12, a tower-type packing 15 and a packing fixing block are respectively provided at the axial center of the above-mentioned packing box 15 from bottom to top.

A centralizer 12 is also provided at the axial center of the above-mentioned packing gland 14 and is in contact with the packing 15 .

The above-mentioned centralizer 12 is two arc-shaped rings with inner and outer layers, and the middle parts of the two arc-shaped rings are dislocated and overlapped to form a circle.

The above-mentioned hydraulic blowout preventer 8 is controlled by a hydraulic pump station with a distance of less than 10 meters.

The above-mentioned I-shaped flange 1, thermal recovery gate valve 2, hydraulic blowout preventer 8 and pressure relief flange 9 are all provided with through holes of 35-60mm in the axial center.

A through hole matching the diameter of the temperature measuring cable 13 is provided at the axial center of the above-mentioned packing gland 14 .

Claims (9)

1. The construction method of the SAGD well temperature measurement cable belt pressure lifting and lowering is characterized in that it comprises the following steps: Step 1. The temperature measuring cable (13) goes downhole under pressure: 1) Install and fasten the fan-shaped end of the I-shaped flange (1) in the temperature measuring cable belt pressure lifting and lower sealing device to the wellhead; 2) Install the thermal recovery gate valve (2), and install the grease injection sealer (6), hydraulic blowout preventer (8), pressure relief flange (9) and packing on the thermal recovery gate valve (2) in sequence box (16) and packing gland (14), until the temperature measuring cable is pressed and lifted, and the lower sealing device is all installed and fastened; 3) Put the temperature measuring cable up and down, observe whether the packing has sealed the temperature measuring cable, then open the thermal mining gate valve (2), and press and lift the temperature measuring cable (13) from the temperature measuring cable through the injection device. The top of the lower sealing device is introduced until the design temperature measurement depth is reached; 4) After the temperature measuring cable (13) is lowered to the design position, inject grease into the grease injection valve (5) of the grease injection sealer (6) of the temperature measuring cable belt pressure lift and lower sealing device through the grease injection machine to realize the measurement. Sealing of warm cable (13); 5) After releasing the pressure through the pressure relief valve (17), remove the packing, and then remove the packing gland (14) and packing box (16) respectively from the temperature measuring cable and the upper end of the lower sealing device by lifting the clamps. ), pressure relief flange (9) and hydraulic sealer (8), and finally install the wellhead static sealing device to seal the wellhead and temperature measuring cable (13); Step 2, the temperature measurement cable lifts the wellhead under pressure: 1) Inject grease into the grease injection valve (5) of the grease injection sealer (6) through the grease injection machine to realize the sealing of the temperature measuring cable (13); 2) By working with the crane to play the elevator, install the packing, remove the static sealing device of the wellhead, and install the hydraulic seal (8) and the pressure relief flange (9) on the grease seal (6) in sequence , Packing box (16) and packing gland (14), and fasten them; 3) Lift the temperature measuring cable (13) into the grease injection sealer (6) through the temperature measuring cable lifting device, and close the thermal mining gate valve (2); 4) After releasing the pressure through the pressure relief valve (17), take out the packing (15) in the packing box (16), and lift out all the temperature measuring cables (13); 5) Remove the packing box (16), pressure relief flange (9), hydraulic blowout preventer (8) and grease sealer (6) in sequence, and finally install the wellhead static sealing device again to seal the wellhead, A pressure relief valve (17) is provided in the transverse middle of the pressure relief flange (9). 2. The construction method of SAGD well temperature measuring cable pressure lifting and lowering according to claim 1, characterized in that before said step 1, it must be confirmed that the wellhead pressure is not higher than 2MPa, the temperature is not higher than 200°C, and the surrounding The steam injection wells within 100 meters are required to stop injection to ensure that the pressure and temperature of the construction wells are stable. 3. The construction method of temperature-measuring cable for pressure lifting and lowering of SAGD well according to claim 1, characterized in that the pressure-lifting and lower sealing device for the temperature-measuring cable is an I-shaped one end flange matching the well head The flange at the other end of the flange (1) is fixedly connected with the flange at one end of the thermal recovery gate valve (2), and the flange at the other end of the thermal recovery gate valve (2) is fixedly connected with the flange at one end of the grease sealer (6). The flange at the other end of the grease injection sealer (6) is fixedly connected to the flange at one end of the hydraulic blowout preventer (8), and the flange at the other end of the hydraulic blowout preventer (8) is connected to the series pressure relief flange (9) ) and one end flange of the packing box (16), the other end of the packing box (16) is screwed to the packing gland (14), and the I-shaped flange (1) is connected to the thermal recovery gate valve (2), Thermal mining gate valve (2) and grease injection sealer (6), grease injection sealer (6) and hydraulic blowout preventer (8) and hydraulic blowout preventer (8) and pressure relief flange (9) and relief A sealing steel ring (7) is provided between the pressure flange (9) and the packing box (16). 4. The construction method for pressure-lifting and lowering of temperature measuring cables in SAGD wells according to claim 3, characterized in that the axial center of the grease injection sealer (6) is respectively provided with sleeves from top to bottom (18), the grease injection sleeve (4) and the grease injection positioning nut (3), and the axial centers of the three are provided with through holes adapted to the diameter of the temperature measuring cable (13). 5. The construction method for pressure-lifting and lowering of SAGD well temperature measurement cables according to claim 4, characterized in that at least one grease injection valve (5) is provided at the transverse centerline position of the sleeve (18), And the grease injection valve (5) is fixedly connected on the grease injection sealer (6). 6. The construction method for pressure-lifting and lowering of temperature-measuring cables in SAGD wells according to claim 3, characterized in that centralizers are respectively provided from the bottom to the top in the axial center of the packing box (15) Locating nut (10), washer (11), centralizer (12), tower packing (15) and packing stop. 7. The construction method for pressure-lifting and lowering of SAGD well temperature measuring cables according to claim 3, characterized in that a centralizer (12) is also provided at the axial center of the packing gland (14) , and in contact with the packing (15). 8. The construction method of SAGD well temperature measurement cable belt pressure lifting and lowering according to claim 7, characterized in that the centralizer (12) is provided with two arc rings with inner and outer layers, and the two arc rings The middle part of the ring is dislocated and overlapped to form a circle. 9. The construction method of temperature-measuring cables for pressure-lifting and lowering of SAGD wells according to claim 3, characterized in that the hydraulic blowout preventer (8) is controlled by hydraulic pump stations with a distance of less than 10 meters.