CN201810292U - Separated layer water injection process tubular column - Google Patents

Abstract

A separated layer water injection process tubular column is applied to the technical field of separated layer water injection of oil fields. The lower end of the bottom plug is provided with a bottom plug, the upper end of the bottom plug is connected with a sieve tube through an oil pipe, the upper end of the sieve tube is connected with a bidirectional acting valve, the bidirectional acting valve is connected with a prefabricated working barrel, the prefabricated working barrel is connected with a lower water distributor, the lower water distributor is connected with a Y241 packer, and the Y241 packer is arranged between an upper water layer and a lower water layer; the Y241 packer is connected with an upper water distributor and an upper water distributor oil pipe; the tubing is connected to the wellhead at all times. The effect is as follows: the separate-zone water injection can be implemented, the Y241 packer is adopted, the requirements of the separate-zone water injection process of the water injection well are met, meanwhile, the phenomenon that the tubular column creeps due to the influences of factors such as temperature and pressure effects and water injection pressure fluctuation is avoided, the effective period of the separate-zone water injection is prolonged, and the water injection development effect is improved. The tubular column adopts a prefabricated working barrel and a two-way acting valve, so that when the tubular column is put into a well and the tubular column is detected and strung out in the later period, the oil pipe is blocked, and the requirement of whole-course operation under pressure is met.

Description

Layered Water Injection Process String

technical field

The utility model relates to the technical field of layered water injection in oilfields, in particular to an underground layered water injection process pipe, which is a process pipe column suitable for carrying out pressure operation when water injection wells are repaired.

Background technique

In recent years, state-owned oilfields have used water injection to increase formation pressure in the later stages of development. When there are multiple water injection layers downhole, layered water injection strings are used for layered water injection. Most of them use Y341 packers, which are affected by factors such as temperature and pressure effects, water injection pressure fluctuations, etc., causing peristalsis of the pipe string, resulting in failure of the packer and unsealing, and the short validity period of the injection. With the prolongation of water injection development time in oilfields, the pressure near the wellbore of water injection wells is very high. At the same time, due to the limitation of the structure of the current layered water injection string, it is impossible to seal the oil pipes during the workover of water injection wells, resulting in a large return of formation water and occupying wells. The time is long, the cost is high, there is a waste of resources, and the balance of formation injection and production is destroyed.

Utility model content

The purpose of this utility model is: to provide a layered water injection process pipe string, while meeting the requirements of the water injection well layered water injection process, at the same time to ensure that the pipe string can be plugged when the pipe string goes into the well and the pipe string is lifted out in the later workover, so as to meet the requirements of the whole process. Needed for pressure work.

The technical solution adopted by the utility model is: the layered water injection process string, which is mainly composed of oil pipe, upper water distributor, Y241 packer, lower water distributor, prefabricated working cylinder, double-acting valve, screen pipe and bottom plug. There is a bottom plug at the lower end, the upper end of the bottom plug is connected to the screen pipe through the oil pipe, the upper end of the screen pipe is connected with a double-acting valve through the oil pipe, the upper end of the double-acting valve is connected to the prefabricated working cylinder through the oil pipe, and the upper end of the prefabricated working cylinder is connected through the oil pipe The lower water distributor, the upper end of the lower water distributor is connected to the Y241 packer through the oil pipe, and the position of the Y241 packer is between the upper water layer and the lower water layer; the upper end of the Y241 packer is connected to the upper water distributor through the oil pipe, and the upper water distributor The upper end is connected to the oil pipe. The upper end of the tubing has been connected to the wellhead.

Beneficial effects of the utility model: the utility model layered water injection process string can implement layered water injection, and adopts Y241 packer to meet the requirements of the layered water injection process for water injection wells while preventing temperature and pressure effects, water injection pressure fluctuations, etc. Influenced by various factors, the pipe string wriggles, prolongs the effective period of layered water injection, and improves the development effect of water injection. The tubing string adopts prefabricated mandrel and double-acting valve to ensure that the tubing string can be plugged when the tubing string is lowered into the well and the string is pulled out in the later stage to meet the needs of the whole process of pressure operation.

Description of drawings

Fig. 1 is a schematic diagram of the pipe column structure of the utility model layered water injection process.

In the figure, 1. Oil pipe, 2. Upper water distributor, 3. Y241 packer, 4. Lower water distributor, 5. Prefabricated mandrel, 6. Double-acting valve, 7. Screen pipe, 8. Bottom plug.

Detailed ways

Embodiment 1: Taking a layered water injection process string as an example, the utility model is further described in detail.

See Figure 1. The utility model layered water injection process string is mainly composed of oil pipe 1, upper water distributor 2, Y241 packer 3, lower water distributor 4, prefabricated working cylinder 5, double-acting valve 6, screen pipe 7 and bottom plug 8. There is a bottom plug 8 at the lower end, and the upper end of the bottom plug 8 is connected to the screen pipe 7 through the oil pipe 1. Barrel 5, the upper end of the prefabricated working barrel 5 is connected to a lower water distributor 4 through the oil pipe 1, and the upper end of the lower water distributor 4 is connected to the Y241 packer 3 through the oil pipe 1, and the position of the Y241 packer 3 is between the upper water layer and the lower water layer Between; the upper end of the Y241 packer 3 is connected to an upper water distributor 2 through the oil pipe 1, and the upper end of the upper water distributor 2 is connected to the oil pipe 1. The upper end of oil pipe 1 is connected to the well head all the time. Y241 packer 3, prefabricated mandrel 5 and double-acting valve 6 are existing products.

Briefly describe the construction process of the layered water injection process string: refer to Figure 1.

A. Down-entry layered water injection process pipe string: the pipe string from top to bottom consists of oil pipe 1, upper water distributor 2, Y241 packer 3, lower water distributor 4, prefabricated mandrel 5, double-way valve 6, screen pipe 7 Adopt threaded connection with bottom plug 8. Before the pipe string goes into the well, dead water nozzles are installed in the upper water distributor 2 and the lower water distributor 4. During the process of the pipe string going into the well, the double-acting valve 6 ensures the plugging of the oil pipe, which can realize the operation under pressure.

B. Tubing string setting: After the tubing string is lowered to the predetermined position according to the design, the tubing is pressurized, and the upper anchoring mechanism of the Y241 packer 3 is stretched and anchored on the casing, and at the same time, the rubber tube of the Y241 packer 3 is set. , to achieve the purpose of hierarchical card layers.

C. Layered water injection: Lower the fishing tool through the steel wire, fish out the stagnant water nozzle, and adjust the water volume according to the geological injection amount of each target layer to reach the allowable error range of geological allocation and injection debugging, and realize normal layered water injection.

D. Workover: When the Y241 packer fails or the development requires that the pipe string needs to be pulled out, firstly, a small-diameter plug matched with the prefabricated mandrel 5 is put in from the wellhead to realize the plugging of the tubing and meet the needs of the snubbing operation. Lift up the tubing string again, unpack the Y241 packer 3, and pull out the tubing and downhole accessories one by one.

Claims (1)

1. A layered water injection process string, mainly composed of oil pipe (1), upper water distributor (2), Y241 packer (3), lower water distributor (4), prefabricated mandrel (5), two-way acting valve (6), composed of screen tube (7) and bottom plug (8), is characterized in that: there is bottom plug (8) at the lower end, and the upper end of bottom plug (8) is connected by screen tube (7), screen tube (7) through oil pipe (1). The upper end of the pipe (7) is connected with a double-acting valve (6) through the oil pipe (1), the upper end of the double-acting valve (6) is connected to the prefabricated work cylinder (5) through the oil pipe (1), and the upper end of the prefabricated work cylinder (5) passes through The tubing (1) is connected to the lower water distributor (4), and the upper end of the lower water distributor (4) is connected to the Y241 packer (3) through the tubing (1). The Y241 packer (3) is located between the upper water layer and the lower water layer. Between layers; the upper end of the Y241 packer (3) is connected to the upper water distributor (2) through the oil pipe (1), and the upper end of the upper water distributor (2) is connected to the oil pipe (1); the upper end of the oil pipe (1) is connected to the wellhead.

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