CN-122014175-A - Double-packer pressure-controlled multistage detonation perforating device and method

CN122014175ACN 122014175 ACN122014175 ACN 122014175ACN-122014175-A

Abstract

The invention relates to the field of well completion oil testing perforation, in particular to a double-packer pressure-controlled multistage detonation perforation device and method; compared with the prior art, the method integrates the flow direction control technology in the pipe column, the well shaft liquid production channel control technology and the perforation test combined technology, can finish oil testing operation of three different reservoirs only by one pipe column, and the oil testing time interval of the three reservoirs can be flexibly selected according to actual requirements, thereby improving the flexibility of the whole oil testing.

Inventors

DONG YONGJUN
LI HONGYAN
ZHANG YANLONG
ZHANG QIUDONG
LI BIN
LIN PENG
HUANG WEITAO
MA JIANPING
FENG ZHENGMENG
GAO WENTAO
CHEN HAO

Assignees

中国石油天然气集团有限公司
中国石油集团测井有限公司

Dates

Publication Date: 20260512
Application Date: 20241111

Claims (10)

1. The double-packer pressure-controlled multistage detonation perforating device is characterized by comprising a first perforating gun unit, a second perforating gun unit and a third perforating gun unit which are all connected with an oil pipe, wherein the first perforating gun unit, the second perforating gun unit and the third perforating gun unit are conveyed into an oil-gas well target layer through the oil pipe, a first packer (8) is set between the first perforating gun unit and the second perforating gun unit, a second packer (13) is set between the second perforating gun unit and the third perforating gun unit, the oil-gas well target layer can be divided into a first oil testing layer, a second oil testing layer and a third oil testing layer, and the first perforating gun unit, the second perforating gun unit and the third perforating gun unit are used for perforating the first oil testing layer, the second oil testing layer and the third oil testing layer respectively.
2. The dual-packer pressure-controlled multistage detonation perforating device according to claim 1, wherein the first perforating device unit comprises a pressure release device (1), a first perforating device (2), a first pressure delay detonation device (3 a), a flow direction control device (4), a pressure balance nipple (5), a first shock absorber (7 a) and a first channel control device (9 a) which are sequentially connected from bottom to top, wherein the first shock absorber (7 a) and the first channel control device (9 a) are separated by a first packer (8).
3. The dual packer pressure-controlled multistage detonation perforating device according to claim 2, wherein the flow direction control device (4) comprises a valve body, at least one ball valve (41) is arranged in the valve body, one end of the ball valve (41) is connected with the valve body through a spring (43), and the other end of the ball valve (41) is connected with a pressure cap (42) for limiting the ball valve (41).
4. The dual packer pressure controlled multistage detonation perforating device of claim 2, wherein the pressure balance nipple (5) is provided with a balance hole (51) for realizing closing of the hole of the channel control device.
5. The dual-packer pressure-controlled multistage detonation perforating device according to claim 1, wherein the second perforating device unit comprises a second perforating device (10), a second pressure delay detonation device (3 b), a sand setting prevention buffer device, a screen joint (12), a second shock absorber (7 b), a pressure transmitting joint (14), a sand supporting leather cup (16), a pressure gauge (17) and a second channel control device (9 b) which are sequentially connected from bottom to top, wherein the second shock absorber (7 b) and the second channel control device (9 b) are separated by a second packer (13).
6. The dual packer pressure controlled multistage detonation perforating device as claimed in claim 5, wherein a flow tube (15) is connected between the screen joint (12) and the pressure transmitting joint (14).
7. The dual packer pressure-controlled multistage detonation perforating device of claim 5, wherein the sand setting prevention buffer device comprises a screw cap (111), a long pressure transmission pipe (112) and a damping plate assembly (113), wherein one end of the long pressure transmission pipe (112) extends into the damping plate assembly (113) for arrangement, and the other end of the long pressure transmission pipe is connected with the screw cap (111).
8. The dual packer pressure controlled multistage detonation perforating device of claim 1, wherein the third perforating device unit comprises a third perforating device (18), a third pressure delay detonation device (3 c), a sand setting prevention buffer device, a screen pipe (19) and a depth correcting nipple (20) which are sequentially connected from bottom to top.
9. The pressure-controlled multistage detonation perforating device with double packers as claimed in claim 1, wherein the first packer (8) is an RTTS packer and the second packer (13) is a shear pin packer.
10. The method of a dual packer pressure controlled multistage detonation perforating device of any of claims 1-9, comprising the steps of: S1, connecting the device with an oil pipe, conveying the device to a target layer of an oil and gas well by using the oil pipe, and adjusting the depth of a pipe column according to the depth of a depth correction pup joint so that a first perforator unit, a second perforator unit and a third perforator unit are opposite to a first oil testing layer, a second oil testing layer and a third oil testing layer; S2, perforating and testing oil on the first oil testing layer through the first perforating tool unit, perforating and testing oil on the second oil testing layer through the second perforating tool unit, perforating and testing oil on the third oil testing layer through the third perforating tool unit, and respectively analyzing and evaluating three stratum.

Description

Double-packer pressure-controlled multistage detonation perforating device and method Technical Field The invention relates to the field of well completion oil testing perforation, in particular to a double-packer pressure-controlled multistage detonation perforation device and method. Background The perforating completion commonly adopts an operation mode of a single-layer single-test perforation test combined operation technology, namely 1 horizon is shot at a time, after oil testing is completed, a pipe column is lifted out to test oil on the next horizon, generally, ash injection blocking is adopted, the construction period is long, the operation cost is high, and the other operation mode adopts a multi-layer perforation test combined operation technology, namely a plurality of horizons are perforated, and a multi-layer combined oil testing test is adopted, so that deviation of oil testing information can be caused by the technology, and each horizon cannot be accurately evaluated. If multiple packers are used for blocking and layering oil testing, the problem of interference of interlayer pressure difference exists in different layers, and packer sticking accidents occur. The fine oil testing is an important means for accurately evaluating different oil and gas reservoirs in oil and gas reservoir exploration, but the double-packer multistage layered perforation and layered independent oil testing can not be realized in the same tubular column. By searching a layered perforation oil test comparison file, for example, a patent CN 105089514A layered perforation oil test string and a use method thereof disclosed by Zhang Youyi and the like, the file discloses a layered perforation oil test string, and the core of the file is that a sliding sleeve sliding along the axial direction of a central tube in a seal valve is adopted to realize that after one time of the string is put into an oil well, the string is not shifted and is calibrated again, and layered perforation and oil test can be carried out by using the layered perforation oil test string. The technology has the main defects of complex structure of a test pipe column and a seal valve, poor reliability by adopting an externally hung pressure transmission pipe mode, complex pressure gradient design and easy misoperation due to pressure control of the detonation of a perforating gun and the switch of the seal valve, and no field practical application case and incapability of proving the effectiveness of the technology in the pipe column structural design and implementation method. Disclosure of Invention Aiming at the problems of complex structure, poor reliability, difficult completion of engineering implementation and the like in the prior art, the invention provides a double-packer pressure-controlled multistage detonation perforating device and a double-packer pressure-controlled multistage detonation perforating method. In order to achieve the above purpose, the present invention adopts the following technical scheme: The invention relates to a double-packer pressure-controlled multistage detonation perforating device which comprises a first perforating tool unit, a second perforating tool unit and a third perforating tool unit which are all connected with an oil pipe, wherein the first perforating tool unit, the second perforating tool unit and the third perforating tool unit are conveyed into an oil-gas well target layer through the oil pipe, a first packer is set between the first perforating tool unit and the second perforating tool unit, a second packer is set between the second perforating tool unit and the third perforating tool unit, the oil-gas well target layer can be separated into a first oil testing layer, a second oil testing layer and a third oil testing layer, and the first perforating tool unit, the second perforating tool unit and the third perforating tool unit are used for perforating the first oil testing layer, the second oil testing layer and the third oil testing layer respectively. As a further improvement of the invention, the first perforator unit comprises a pressure release device, a first perforator, a first pressure delay initiation device, a flow direction control device, a pressure balance nipple, a first shock absorber and a first channel control device which are sequentially connected from bottom to top, wherein the first shock absorber is separated from the first channel control device by a first packer. As a further improvement of the invention, the flow direction control device comprises a valve body, at least one ball valve is arranged in the valve body, one end of the ball valve is connected with the ball valve through a spring, and the other end of the ball valve is connected with a pressing cap for limiting the ball valve. As a further improvement of the invention, the pressure balance nipple is provided with a balance hole for realizing the closing of the channel control device. As a further improvement o