Method to perform survey of well provided with sucker-rod pump

FIELD: oil industry, particularly to perform running wells provided with flow strings and sucker-rod pumps.

SUBSTANCE: method involves stopping rocker-machine operation during work performing at well head and sucker-rod pump operation for not more than 20 min; lowering instrument into well; lowering instrument connected to logging cable through cable head for 2 meters; bringing rocker-machine in operation and continuing instrument lowering in well; repeatedly brining sucker-rod pump in operation up to working level reaching during instrument lowering and after instrument lowering; performing survey during sucker-rod pump operation when sucker-rod pump reaches working mode of operation; lifting the instrument to well head after survey termination; stopping the tool at height spaced 100 meters from well head; bringing rocker-machine and sucker-rod pump out of operation; removing the instrument from well and repeatedly bringing rocker-machine and sucker-rod pump in operation.

EFFECT: increased operational reliability due to prevention of logging cable loop forming about flow string and increased reliability of survey results due to measurement performing in working well operation regime.

 

The invention relates to the oil industry and can be used for surveys of existing wells.

There is a method of research wells equipped with push rod pumps, including the descent of logging tools on wireline in the borehole to determine the intervals of flow in the tubing after extracting the plug-in pump with filter, with the call flow exercise swabbing or compressing via a valve node unilateral action (Application RU # 2003112724 AND class. E 21 In 47/00, publ. 2004.12.10).

The known method does not allow to analyze the situation in the annular space of the well.

The known method of descent of the device in the borehole, including the equipment of the well sucker rod pump, the descent into the well liner and tubing and a pass device in the annular space. The shank down through the fishing device of the column tubing and install it in the casing before placing nodes downhole sucker rod pump (RU # 2029079 C1, CL E 21 In 47/00, 20.02.1995).

The closest to the proposed invention the technical essence is a method of study of a well equipped with a column tubing and sucker rod pump comprising a stop work of art is NSV-rocking when working on the wellhead and pump the descent into the well through the annular space on the cable of the device, the start of the pumping unit and sucker rod pumps in operation, after conducting exit to the operating mode of operation of the pumping unit and sucker rod pump and removing the device from the well(RU # 2052089, CL E 21 In 47/00, 10.01.1996).

The known method does not allow a full range of research in the well.

The disadvantage of this method is the difficulty associated with the descent of the equipment in the well, the low reliability of its installation in the borehole, the complexity, the possibility of kinking of the cable.

The invention solves the problem of improving reliability by preventing loops geophysical cable around the column tubing when conducting lowering and lifting of the depth of the device, improving the reliability of research results through definitions in operating mode wells.

The task is solved in that in the method of study of a well equipped with a column tubing and sucker rod pump, including the shutdown of the pumping unit when working on the wellhead and pump descent into the well through the annular space on the cable of the device, the start of the pumping unit and sucker rod pumps in operation, conduct after entering the mode of study well, the last stop is conducting research on the operation of the pumping unit and sucker rod pump and removing the device from the well, according to the invention for the descent of the device the operation of sucker rod pump is stopped for a time not more than 20 min, then the device on the cable down through the cable head to two metres after the start of pumping unit and sucker rod pump device continue to be taken down, while restoring the work of the pump to the working level during and after the descent of the instrument in the borehole, when lifting the unit to the wellhead after research it stop at 100 meters to the mouth of the well, then the operation of the pumping unit and sucker rod pump stops, remove the device from the well and restore the operation of the pumping unit and sucker rod of the pump.

The invention consists in the following.

Reliable research well prevents a number of reasons, such as determining the parameters in idle mode pumping equipment, the hanging device in the annular space, the loops of the wireline and other Known technical solutions eliminate these reasons only partially. In the proposed method solves the problem of improving reliability by preventing loops geophysical cable around the column tubing when conducting lowering and lifting of the depth of the device, improving the reliability of research results through the definition of the s when the operating mode of the well. The problem is solved as follows. When researching well-equipped column tubing and sucker rod pump down into the well through the annular space on the wireline device and conduct research. As the wireline use thick wireline diameter > 14 mm This cable, having sufficient rigidity and thickness, is not subject to paleobotany, easily passes through the seal at the wellhead and easily pushed into the hole and retrieved from the well.

As the device uses a small-sized device with a diameter not exceeding 32 mm, This device easily fits into the annular space up and down.

Appropriate devices OWL-3/28, OWL-C3-28-60, AMDT-MP, AGATE-28. The connection cable can be used cables brands KG3×0,75-60-180; KHS×1,5-150-150-4; KG×0,75-75-150.

Cable type CGS×1,5-150-150-4 has the following characteristics:

Feature cable KHS×1,5-150-150-4:

Breaking strength not less than 150 kN.

Outer cable diameter of 14.4 mm

The diameter of the upper part of the cable 10,2-16,4 mm

The diameter of the lower part of the cable 20-38 mm

For descent device to stop the operation of the pumping unit at the wellhead. Accordingly stops the operation of the sucker rod pump. This stop is associated with the safety precautions of the work involves stopping the pumping unit when working on the wellhead. Open the seal, put the device on the cable is two meters in the annulus of the well. Close the seal covering the cable, start the machine-the rocking chair and put the device on the cable down. In the process of descent of the device and after restore a sucker rod pump to the working level. Studies conducted at operating rod pump after working mode. Due to this, achieve data reliability of operation of the well, increasing the information content. In addition, this work remains the productivity of the well. After conducting studies raise the device to the mouth of the well and stop it for 100 meters to the mouth of the well, then stop pumping unit and, accordingly, sucker rod pump, remove the device from the well and restore the operation of the pumping unit and sucker rod pumps.

Such studies may also be performed when swabbing the well, when the stop column tubing in the well (after removing the pump and tubing slid over laboulbeniales). Geophysical studies in the annular space and when swabbing solve the following tasks:

- Determination of the flow profile of fluid from the exploited layers.

- Determination of the integrity of the casing string.

- Determine which of the integrity of the column tubing.

- The definition of cross-flows.

- Positioning of the dynamic level in the annulus.

- Determination of the thickness of the walls of the column, the amount of wear, areas of corrosion, longitudinal and transverse rupture, buckling, swelling.

- Define vodonagrevatel.

- Determination of the temperature of the reservoir and around the wellbore.

- Determination of the effective capacity of the reservoir.

- Determination of the specific gravity of the liquid in the column pointervalue.

- Determination of depth of bottom.

- Determination of the couplings of the production casing and tubing.

- Definition of the natural gamma-ray activity of rocks.

- Determination of the water content of the reservoir with bottom water (radio effect).

Specific example

Conduct research of the oil wells with the following characteristics: the depth of 1730 m, diameter of casing 146 mm, the diameter of the column tubing 73 mm, the depth of the suspension column tubing 1300 m, used pump rod 20-125-RHAM-12-4-3, cable type KTc1×1,5-150-150-4 thickness of 14 mm, the device OWL-3/28 (purpose underlying instrument: to oversee the development and maintenance of oil and gas wells, including surveys through annulus GGP) with a diameter of 28 mm Bore operates in the mode of the number of swings per minute 3,7, the length of policeman is on stock 2.1 m, the flow rate of 6.4 m3/day, the dynamic level 230 m

For descent device to stop the operation of the pumping unit at the wellhead. Accordingly stops the operation of the sucker rod pump. Through the cable cylinder, connect the cable and the device. Open the seal, put the device on the cable 2 m annulus of the well. Close the seal covering the cable, start the machine-the rocking chair and put the device on the cable down. The device is placed at a depth of 1730 m In the process of descent of the device and after restore a sucker rod pump to the working level. Studies conducted at operating rod pump after working mode of the well.

If research determines that the profile of the fluid flowing from the exploited strata, the integrity of the casing, the integrity of the column tubing, annulus fluid flows, the provisions of the dynamic level in the annulus, the thickness of the walls of the column, the amount of wear, areas of corrosion, longitudinal and transverse rupture, buckling, swelling, vodonagrevatel, the temperature of the reservoir and the wellbore, the effective capacity of the reservoir, the weight of liquid in the column pointervalue, the depth of the bottom hole, the coupling of the production casing and tubing, natural gamma-activity of rocks, the water content of the reservoir with bottom water(radio effect).

After conducting studies raise the device and stop 100 meters away from the wellhead. Stop pumping unit and, accordingly, sucker rod pump, remove the device from the well and restore the operation of the pumping unit and sucker rod pumps.

The studies achieve data reliability of operation of the well, increasing the information content, which consists in the brief stop of the pumping unit and as a consequence saving operating mode of the system "reservoir-well" (depression, the steady-state thermal regime in the well) in the research process, the smooth descent of the depth of the device on microbio, while research around the well bore to the bottom without loops geophysical cable due to its rigidity and small size of the depth of the device (no additional weight). By the usual method of descent of the device is Solest underlying instrument and geophysical cable, the machine-rocking forced ostanavlivaut for "rasagiline" device to extract and re-descent, which takes additional time and results are distorted.

The application of the proposed method will improve the reliability and accuracy of results.

Way to research well about Dowanol column tubing and sucker rod pump, including the shutdown of the pumping unit when working on the wellhead and pump descent into the well through the annular space on the cable of the device, the start of the pumping unit and sucker rod pumps in operation, conduct after entering the mode of study well, stop after conducting research on the operation of the pumping unit and sucker rod pump and removing the device from the well, wherein the release device operation rod of the pump is stopped for a time not more than 20 min, then the device on the cable down through the cable head to two metres after the start of pumping unit and sucker rod pump device continue to be taken down, while restoring the work of the pump to the working level during and after the descent of the instrument in the borehole, when lifting the unit to the wellhead after research it stop 100 meters away from the wellhead, then the operation of the pumping unit and sucker rod pump stops, remove the device from the well and restore the operation of the pumping unit and sucker rod pumps.



 

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