CN-121993047-A - Open hole segmented completion string for natural energy production of full open hole section and use method thereof

CN121993047ACN 121993047 ACN121993047 ACN 121993047ACN-121993047-A

Abstract

The invention discloses an open hole segmented completion pipe column for natural energy production of an all-naked eye section and a use method thereof, belonging to the technical field of underground tools and processes of oil and gas fields, wherein heavy mud in a wellbore of a segmented pipe column well Duan Yuan is replaced by a screen pipe, in a fluid replacement process, organic brine, white oil or clear water is ensured to be replaced above a suspended completion integrated packer, and the equivalent density of the all-well after fluid replacement is not lower than that before fluid replacement, so that the fluid in the wellbore is ensured to have enough density to balance stratum pressure. The method comprises the steps of constructing a backflow tubular column section fluid replacement safety barrier and a full-naked eye section natural open-flow injection safety barrier through an independent setting and hanging well completion integrated packer and an opening switchable sliding sleeve, realizing accurate control and management of each reservoir section through the setting of the open-naked eye packer and the closing of the switchable sliding sleeve after the full-naked eye section natural open-flow injection test, realizing the operation of gradually opening the fracturing sliding sleeve through a ball throwing or special opening tool (aiming at the switchable sliding sleeve), and the like, and realizing the respective transformation of each reservoir section, thereby improving the reservoir transformation effect.

Inventors

WANG LANG
FENG JUEYONG
WANG YAN
ZHAO XIAOHAI
WANG QIAO
Lou Erbiao
LIU JUNYAN
PAN ZHAOCAI
LI LILI
CHENG ZHENGHUA
ZHANG WEI
XU QIANG
LIU SHUANG
WANG KUN

Assignees

中国石油天然气股份有限公司

Dates

Publication Date: 20260508
Application Date: 20241106

Claims (10)

1. The open hole segmented completion pipe string for natural energy production of the full open hole section is characterized by comprising a feeding pipe string and a return pipe string; The feeding pipe column comprises an open hole (2) and a sleeve (1) which are connected with each other, an oil pipe (7) is arranged in the open hole (2) and the sleeve (1), and a guide shoe (3), a screen pipe (4), a three back pressure valve (5), a self-sealing ball seat (6), a differential pressure sliding sleeve (8), a first open hole packer (9), a ball throwing sliding sleeve (10), a second open hole packer (22), a switchable sliding sleeve (11), a hanging well completion integrated packer (12), a tie-back cylinder (13) and a feeding tool (14) are sequentially arranged on the oil pipe (7) from the open hole (2) to the sleeve (1); The well completion packer is characterized in that a locking seal (15), a perforated screen pipe (16), a telescopic short joint (17), a casting-in type blanking plug (18), a well completion packer (19), a double male short joint (20) and a tubing hanger (21) are sequentially arranged in the plug-in pipe column.
2. A use method of an open hole segmented completion string with natural energy production in an all-open hole section is characterized by comprising the steps of based on the open hole segmented completion string with natural energy production in the all-open hole section of claim 1, lowering the segmented string to a designed depth, replacing heavy mud in a well Duan Yuan shaft of the segmented string through a screen pipe (4), accurately calculating the required quantity and density of various liquids according to the size of the well shaft, ensuring that organic brine or white oil or clear water can be replaced above a hanging completion integrated packer (12), simultaneously ensuring that the equivalent density of the all-well is not lower than that before the fluid replacement, independently setting and hanging the completion integrated packer (12) after the fluid replacement is completed, lifting a feeding tool (14), lowering a back-in plug pipe, locking a seal (15) with the back-in pipe (13), replacing a wellhead, installing a production tree, using a well protection fluid through a perforated screen pipe (16), replacing the well fluid, casting a casting into a casting blanking plug (18), positively pressing a completion packer (19), then pressing a completion packer (11) to a ball seat (11), opening a sliding sleeve (11), closing a sealing ball seat (11), opening a sealing ball (11), and closing a sealing ball seat (11), opening a sliding sleeve (11), sealing a well, and automatically closing a well ball seat (11), all open hole packers (9) in the setting segmented pipe column are pressed, normal pressing is continued, the differential pressure sliding sleeve (8) is opened, then the ball throwing sliding sleeve (10) is sequentially opened, corresponding reservoir sections between the open hole packers (9) are respectively transformed, a continuous oil pipe is put into an opening tool to open the switchable sliding sleeve (11), the upper reservoir section is transformed, and after the full transformation of all reservoir sections is completed, the well is opened, drainage is carried out, and production is obtained.
3. The method for using the open hole segmented completion string for natural energy production of the full open hole section according to claim 2, wherein the ball throwing sliding sleeve (10) forms a closed space in the oil pipe by throwing soluble balls with matched sizes, and the ball throwing sliding sleeve (10) is opened by pressing the oil pipe and shearing a shearing pin at the ball throwing sliding sleeve (10).
4. The use method of the open hole segmented completion string with natural energy of the full open hole section according to claim 2, wherein the suspended completion integrated packer (12) has independent setting capability, and the suspended completion integrated packer (12) is independently set after completion of fluid replacement of the segmented string well section, so that split setting with the open hole packer is realized.
5. The use method of the open hole segmented completion string with natural energy production of the full open hole segment as claimed in claim 2, wherein the locking seal (15) is matched with the tieback cylinder (13).
6. The use method of the open hole segmented completion string with natural energy production of the full open hole section, as claimed in claim 2, wherein the completion packer (19) is combined with a dart to form a seal through a casting-in type blanking plug, the wellhead is pressed to complete setting, and the dart is lifted out through a wire operation or a continuous oil pipe after setting.
7. The use method of the open hole segmented completion string for natural energy production of the full open hole segment, according to claim 2, wherein the screen pipe (4) is a fluid replacement channel between the inside of the segmented string oil pipe (7) and an annulus.
8. The use method of the open hole segmented completion string for natural energy production of the full open hole section, which is disclosed in claim 2, wherein the differential pressure sliding sleeve (8) is pressed into the string through a closed space formed by the sealing ball and the self-sealing ball seat (6), a differential pressure is formed between the inside of the oil pipe and the annular space of the sleeve at the differential pressure sliding sleeve (8), and the differential pressure sliding sleeve (8) is opened under the action of the differential pressure to form a flow channel between the first reservoir section and the shaft.
9. The use method of the open hole segmented completion string with natural energy production of the full-naked eye section according to claim 2, wherein the switchable sliding sleeve (11) comprises a barrel, a ball seat, a switchable mechanism and a sealing structure, wherein the ball seat is used for realizing the first opening of the switchable sliding sleeve (11) by bearing a sealing ball holding pressure shearing pin, meanwhile, the ball seat has salvagability, the sealing ball and the ball seat are salvaged by a special salvaging tool for lowering an oil pipe (7), and the switchable mechanism moves by a mechanism formed by the special opening or closing tool for lowering the oil pipe (7) so as to realize the repeated opening or closing of the switchable sliding sleeve (11).
10. The use method of the open hole segmented completion string for natural energy production of the full open hole section according to claim 2, wherein the perforated screen pipe (16) is a fluid replacement channel between the inside of the return pipe string oil pipe (7) and the annulus.

Description

Open hole segmented completion string for natural energy production of full open hole section and use method thereof Technical Field The invention belongs to the technical field of downhole tools and processes of oil and gas fields, and particularly relates to an open hole segmented completion string capable of producing natural energy in an all-open hole section and a use method thereof. Background The natural productivity test of the oil and gas reservoir has a vital effect on the evaluation and improvement of the oil and gas reservoir. Through the natural productivity test, the original productivity of the oil and gas reservoir when not reformed can be known, and a basis is provided for a subsequent reforming scheme. The existing open hole segmented well completion reconstruction process has been widely applied, but has some defects in practical application. In the existing open hole sectional well completion reconstruction process, after a sectional pipe column is sent into place, a packer and an open hole packer are hung to complete setting at one time, so that the segmentation of different reservoir sections is realized, and sliding sleeves are arranged among the sections to achieve the purpose of differential reconstruction. However, the tubular column and the process can only test the natural productivity of the first section of open flow after opening the first sliding sleeve, and cannot test the natural productivity of the full open hole section. This means that the natural capacity of each reservoir section cannot be fully understood during the reforming process, thereby affecting the formulation and implementation of the reforming scheme. At present, the conventional practice for the full open hole section natural productivity test is to separately run a test string before running the open hole section string. While this approach may enable natural productivity testing of the full-nude eye segment, it also presents some problems. First, running a test string in a single pass can greatly increase operational risk because it requires multiple operations and connections downhole, increasing the risk of equipment damage and personnel injury. Second, this also increases the cycle time and cost because it requires additional time and resources to complete the test job. Disclosure of Invention The invention provides an open hole sectional well completion string for natural energy production of a full open hole section and a use method thereof, and solves the problem that the risk of single test string running is high before the open hole sectional string is run in the full open hole section natural energy production test. In order to achieve the above purpose, the present invention provides the following technical solutions: an open hole segmented completion string for natural energy production of an all-open hole section comprises a feeding string and a return insertion string; The feeding pipe column comprises an open hole and a sleeve which are connected with each other, oil pipes are arranged in the open hole and the sleeve, and a guide shoe, a screen pipe, a three-back pressure valve, a self-sealing ball seat, a differential pressure sliding sleeve, a first open hole packer, a ball throwing sliding sleeve, a second open hole packer, a switchable sliding sleeve, a hanging completion integrated packer, a tieback cylinder and a feeding tool are sequentially arranged on the oil pipes from the open hole to the sleeve; the locking seal, the perforated sieve tube, the telescopic short joint, the throwing-in and fishing-out type blanking plug, the well completion packer, the double male short joint and the oil pipe hanger are sequentially arranged in the plug-in pipe column. A method for using an open hole subsection completion string capable of natural production in an all-open hole section includes the steps of lowering the subsection string to a designed depth, replacing heavy mud in a subsection string well Duan Yuan shaft through a screen pipe, accurately calculating the required quantity and density of various liquids according to the size of the shaft, ensuring that organic brine or white oil or clear water can be replaced above a suspended completion integrated packer, simultaneously ensuring that the equivalent density of the whole well is not lower than that before the replacement of the liquid, independently setting the suspended completion integrated packer after the replacement of the liquid is completed, lifting a running tool, lowering a jack-in string, locking and sealing the jack-in string with a return tube, replacing the wellhead with a gas production tree, replacing well killing liquid with small displacement through a perforated screen pipe, after the replacement of the liquid is completed, throwing a shuttle dart to a throwing type blanking plug, directly pressing the completion packer, then opening a sliding sleeve measuring hole, opening the production through a sliding sleeve meas