CN201218080Y - New process pipe column for gas well partial pressure test - Google Patents

Abstract

A new process string for partial pressure and partial test of gas well designed for two layers of gas well with double packer fixed string for layer fracturing and layer test, including wellhead catcher (1), tubing (2) The upper packer (5), the lower packer (8), etc., the wellhead catcher (1) is connected with the tubing (2), and hydraulic anchors (4 ), the upper packer (5), the sandblasting sliding sleeve (6) is installed on the oil pipe (2), and the hydraulic anchor (7), the lower seal A spacer (8), a sliding sleeve seat (9), and a setting ball (10) are installed at the bottom of the oil pipe (2), which avoids multiple well killing, sand washing, and tripping operations, and reduces secondary damage to the reservoir. Secondary pollution; It also reduces labor intensity and shortens the gas test cycle.

Description

Gas well partial pressure test new technology string

Technical field:

The utility model is a new technology pipe string for partial pressure and partial test of gas well, which is designed for layered fracturing and layered test by adopting double-packer fixed pipe strings in two layers of gas wells.

Background technique:

For gas wells with two or more perforation sections, if layered fracturing is to be performed, gas test data for each layer must be obtained at the same time. Generally, bridge plugs, sand filling and other techniques are used, that is, the lower section is shot first. After fracturing, drain fluid to seek production; then use methods such as sand filling, liquid rubber plugging, and bridge plugs to temporarily block the lower section; then perform perforation, fracturing, and fluid drainage operations on the upper section; then sand washing or Rush rubber plugs, salvage or drill and mill bridge plugs; finally carry out combined layer mining. However, the above-mentioned methods all require well killing, tripping, and sand washing operations, so the construction period is long, the damage to the reservoir is relatively large, and blowout may occur.

Invention content:

The purpose of this utility model is to provide a new process string for partial pressure and partial test of gas well, which uses the upper packer and the lower packer as the main process string to meet the requirements of layered fracturing and Layer testing process requirements.

The utility model is realized in the following way: it includes wellhead catcher, oil pipe, casing, hydraulic anchor, upper packer, sandblasting sliding sleeve, hydraulic anchor, lower packer, sliding sleeve seat, setting ball, There are oil pipes, and the wellhead catcher is connected with the oil pipes. In the casing, the oil pipes are respectively equipped with hydraulic anchors and upper packers. The oil pipes are equipped with sandblasting sliding sleeves. The lower packer, the sliding sleeve seat, and the setting ball are installed at the bottom of the tubing.

The utility model has the advantages of:

First, due to the use of packers and hydraulic anchors that can withstand high pressure, the reliability of layered fracturing is guaranteed, and any layer of sand plugging can be removed by reverse circulation.

Second, the special design of the fracturing controller (steel balls are used in conventional layered fracturing), which can smoothly crawl to the wellhead after the fracturing is completed, relying on the effect of reverse fluid drainage, to ensure the smooth flow of the wellbore, which is beneficial to the next layered test .

Third, through steel wire operation, use the upper and lower layer plugs to block the upper and lower layers and the backwash switch respectively, and independently test each layer for production.

Fourth, due to layered fracturing, the wellbore is unblocked after the test (conventional steel balls are used to block the lower layer, and the steel balls will remain in the wellbore after the layered fracturing is completed), which is convenient for the gas well to be layered. Lift the pipe string.

Fifth, the organic combination of the special design structure of the fracturing controller and the supporting tools at the wellhead can realize the integration of layer-by-layer fracturing and layer-by-layer testing without needing to kill the well. Fully producing multiple gas-bearing layers and being able to independently test each layer is of great significance for improving single well production and accurately understanding reservoirs.

Sixth, compared with the traditional methods of using bridge plugs and sand filling, it avoids multiple well killing, sand washing, and tripping operations, and reduces the secondary pollution of the reservoir; it also reduces labor intensity and shortens the drilling time. The gas test period is shortened, and the cost of gas field development is reduced.

Description of drawings

Accompanying drawing is the structural representation of the utility model.

Detailed ways

As shown in the drawings, the wellhead catcher 1, tubing 2, casing 3, hydraulic anchor 4, upper packer 5, sandblasting sliding sleeve 6, hydraulic anchor 7, lower packer 8, sliding sleeve seat 9, It is composed of setting ball 10, tubing 2 is installed in casing 3, and wellhead catcher 1 is connected with tubing 2. In casing 3, hydraulic anchor 4 and upper packer 5 are respectively installed on tubing 2, and nozzle Sand sliding sleeve 6, hydraulic anchor 7, lower packer 8, sliding sleeve seat 9 are successively installed on the lower oil pipe 2 of sandblasting sliding sleeve 6, and setting ball 10 is installed at the bottom of oil pipe 2.

Firstly, the two gas layers are shot at one time. In order to ensure the combination tool goes into the well smoothly, the well must be opened after perforation, and then the fracturing test string is run in layers, the ball is set and the lower layer is fractured; then the fracturing controller is turned on. Sandblasting sliding sleeve, fracturing the upper layer, that is, through the isolation of the packer and the opening of the downhole sandblasting sliding sleeve, the fracturing reconstruction is realized layer by layer from bottom to top, so as to realize layered fracturing without moving the string. When spraying and discharging fluid in the combined layer, the fracturing controller opens the crawling slips under the action of the flowback fluid, and crawls upwards to the wellhead catcher 1; after the pressure is relieved, directly take out the fracturing controller, and continue to drain until the end; Finally, the layered test is realized by switching on and off the sand blaster and pulling out the upper and lower blockers.

Compared with the traditional method of using bridge plugs, sand filling and other techniques for layered fracturing and layered testing, multiple well killing, sand washing, and tripping operations are avoided, and secondary pollution to the reservoir is reduced; It also reduces the labor intensity and shortens the gas test period.

Claims (1)

1. the gas well dividing potential drop is divided examination new technology tubing string, comprise well head catcher (1), oil pipe (2), sleeve pipe (3), hydraulic anchor (4), upper packer (5), sandblast sliding sleeve (6), hydraulic anchor (7), lower packet (8), sleeve base (9), setting ball (10), oil pipe (2) is housed in the sleeve pipe (3), it is characterized in that: well head catcher (1) is connected with oil pipe (2), in sleeve pipe (3), hydraulic anchor (4) is housed respectively on the oil pipe (2), upper packer (5), sandblast sliding sleeve (6) is housed on the oil pipe (2), on the bottom oil pipe (2) of sandblast sliding sleeve (6), hydraulic anchor (7) is installed successively, lower packet (8), sleeve base (9) is equipped with setting ball (10) in the bottom of oil pipe (2).

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