Drilling-free sizing collar and process
A grading hoop and drilling technology, which is applied in earth-moving drilling, wellbore/well components, sealing/packing, etc., can solve the problems of rising cost and time-consuming, and achieve the effect of saving social benefits and significant economic benefits.
Active Publication Date: 2013-07-31
CHANGQING GUJING OF CNPC CHUANQING DRILLING ENG
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Problems solved by technology
If the existing staged hoop cementing technology is used, it is necessary to lower the small drilling tool to drill the cement plug, which takes a lot of time and the cost will increase accordingly
Method used
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[0028] Such as figure 1 As shown, the drill-free grading hoop: including the jacket 10, the gravity plug seat 1, the upper joint 11, the lower sleeve 4, the closing sleeve 6 and the rubber plug sleeve 7, the lower end of the gravity plug seat 1 is the seat body, the upper end is the cylinder body, and the upper end cylinder The body is connected with the rubber plug sleeve 7 to form one body. The gravity plug seat 1 and the outer sleeve 10 are separated by the sliding sleeve 4 and the closing sleeve 6. The sliding sleeve 4 is on the bottom and the closing sleeve 6 is on the top. The third pin group 9 and the fourth pin group The pin group 3 connects the cylinder body of the gravity plug seat 1 with the sliding sleeve 4 and the closing sleeve 6, and connects the sliding sleeve 4 and the closing sleeve 6 with the jacket 10 through the first pin group 2 and the second pin group 8, and the top port of the jacket 10 Connect connector 11.
[0029] Between the first pin group 2 and ...
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The invention belongs to a well cementation underground tool, in particular to a drilling-free sizing collar and a process. The drilling-free sizing collar comprises an outer sleeve, a gravity plug seat, an upper joint, a lower slide sleeve, a closing sleeve and a rubber plug sleeve. The invention has the technical scheme that the process comprises the following steps: carrying out the primary cement filling operation according to the well cementation procedure; putting a gravity plug after the primary well cementation pressure building is completed so that the gravity plug seat and the lowerslide sleeve can synchronously go down; opening a circulation hole for establishing secondary circulation; then, implementing the secondary cement filing operation; completing the pressure building when a secondary rubber plug moves to the rubber plug sleeve of the sizing collar after the secondary cement filling operation is completed; pressurizing the well for shearing off the closing sleeve and a second nail pin group; pushing the closing sleeve and the rubber plug sleeve to synchronously move down; closing the circulation hole; then, continuously carrying out pressurization; controlling the pressure variation so that the gravity plug seat, the gravity plug, the rubber plug sleeve and the secondary rubber plug are connected into a whole body to be sunk into the well bottom; and completing the secondary cement filling operation. The invention provides the drilling-free sizing collar and the process with the advantages of low cost, good manufacturability and short time.
Description
technical field [0001] The invention belongs to well cementing downhole tools, in particular to a drilling-free grading hoop and a technique. Background technique [0002] The maximum drilling depth of oil wells in Changqing Oilfield reaches 3,100 meters, the maximum vertical depth reaches 2,900 meters, and the span of the oil zone (from Yan’an Formation to Yanchang Formation) reaches 900 meters. Due to the serious leakage of Luohe Formation and the serious corrosion of formation water on the casing, the oilfield company The cement slurry is required to return to the ground for 300-500 meters. In order to save costs and shorten the well construction period, all oil layer casing cementing adopts a one-time up-and-back cementing process. Leakage often occurs during cementing, ranging from insufficient cement return height, to severe quality accidents of unsealed upper oil layers. Therefore, the one-time up-and-back cementing process can no longer meet the cementing requireme...
Claims
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IPC IPC(8): E21B33/13
Inventor 彭国荣贾芝王大权周兴春李宏峰窦虎清
Owner CHANGQING GUJING OF CNPC CHUANQING DRILLING ENG