CN201241631Y

CN201241631Y - Gas well salt-proof pipe column

Info

Publication number: CN201241631Y
Application number: CNU2008200212486U
Authority: CN
Inventors: 崔朝轩
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-04-21
Filing date: 2008-04-21
Publication date: 2009-05-20
Anticipated expiration: 2018-04-21

Abstract

A gas-well salt-resistant pipe column is adapted to preventing affecting production or accidents of jamming of a drilling tool by formation salt in the oil-field gas-well production. The novel pipe column structure comprises an oil pipe string 1, a drainage single-flow valve 2, a packer 3 and a tail-pipe single-flow valve 4, and is characterized in that the tail-pipe single-flow valve is connected with the bottom end of the pipe column, and lowers to the bottom end of a gas layer, the packer lowers to the top portion of the gas layer, the drainage single-flow valve is tightly connected to the upper portion of the packer, and the above tools are in series connection by the oil pipe string. When going into production, gas lift fluid is pressed by positive pressure in the oil pipe string 1, thereby pressing liquid accumulating in the well above the drainage single-flow valve 2 in the oil pipe into an annular cavity, and then opening the well for gushing to induce the gas layer 7 to exit gas. The utility model has the advantages of preventing the formation salt to clamping and burying the pipe column, preventing liquid back flowing to the gas to influence gas producing in the gas well, and adding protection fluid in the annular cavity to protect casing pipes, and further, positive pressure gas lift reduces the use level of gas lift fluid, thereby saving gas lift cost.

Description

A kind of gas well is prevented the salt tubing string

Affiliated technical field:

The invention belongs to oil field downhole tool, flow string, be applicable to prevent in the gas well production that the stratum from haveing salt influence and producing or cause accident such as bit freezing.

Background technology:

In the oil field development middle and later periods, the gas well stratum energy reduces, and goes out salt well and increases, and stops up gas-bearing formation, reduces production capacity, and the water mixing salt discharge, to press down effect such as salt agent poor.The present technology of using has the following disadvantages in application:

1, water mixing salt discharge period of validity is short, easily kills the stratum.This technology by the salt solution that mixes clear water dilution down-hole high concentration after, go out well head by the down-hole high pressure gas-entrained, avoid the salt water crystallization to stop up gas-bearing formation and tubing string.But because the gas-bearing formation energy reduces year by year, output reduces, and carries energy and weakens, and the improper meeting of water mixing kills the stratum, causes the gas well underproduction even stopping production, follow-up gaslift discharge opeing expense height.Period of validity is short behind this process implementing.

2, press down the anti-salt period of validity weak point of salt agent.Press down the salt agent and can stop the high salt concentration water crystallization, but can form Powdered salt sand grain, it can sink to the shaft bottom, causes gas-bearing formation to be buried the reduction production capacity.

Summary of the invention:

On the basis of analyzing oil and gas well salt crust mechanism, the anti-salt tubing string of a kind of gas well is proposed.This tubing string has taken into full account also except that considering anti-salt that the gas well energy is low, the discharge opeing situation of difficult, after going into the well, the anti-salt tubing string of gas well can utilize present gas well discharge opeing technology to go into operation, in normal productive process control salt separate out or carry out well head, prevent that salt crust from influencing the gas well ordinary production.

The technical scheme that its technical problem that solves the utility model adopts is: this novel tubular column structure is made up of oil pipe string 1, draining ball-and-seat 2, packer 3, tail pipe ball-and-seat 4 four parts, it is characterized in that: the tail pipe ball-and-seat is connected tubing string bottom, down to the gas-bearing formation bottom, packer is down to the gas-bearing formation top, the draining ball-and-seat is right after the top at packer, more than connect with oil pipe string between each instrument.Its function is: adopt packer 3 packings to go out salt deposit and gas pay 7, oil jacket annular space 6 injects well killing fluid balanced salt stressor layer and prevents that salt deposit from going out salt solution.Packer bottom tail pipe is down to the gas-bearing formation bottom, and tail pipe connects ball-and-seat 4 bottom, prevents from that liquid pours in down a chimney in the oil pipe string 1 to enter gas-bearing formation 7.Draining ball-and-seat 2 in this novel tubular column structure is made up of top connection 8, lower contact 9, centre bore 10, a plurality of eccentric ball-and-seat 11, inlet 12 communicates with oil pipe inside, liquid outlet 13 communicates with the oil jacket annular space, only allow fluid from oil pipe inside to the oil jacket inventionannulus flow, and annulus fluid can not enter oil pipe inside.Oil pipe string 1 interior forehand is pressed into the gaslift fluid during operation, and hydrops in the well of oil pipe internal drainage ball-and-seat more than 2 is clamp-oned annular space, and open flow induces gas-bearing formation 7 to give vent to anger then.Packer in this novel tubular column structure is divided into disconnected two sections up and down to the oil jacket annular space, and hypomere is the gas-bearing formation section, and epimere is for filling the oil jacket annular space of casing protection liquid.This tubing string is well-flushing just, if add the casing tube anti-corrosive agent, can insert oil jacket annular space 6 protective casings during well-flushing.

Its advantage was after the utility model tubing string was gone into the well: prevent that the stratum from going out salt card pipe laying post; Preventing that liquid from pouring in down a chimney enters gas-bearing formation and influences the gas well aerogenesis; But annular space adds also protective casing of protection liquid; Forehand is calmed the anger and is lifted the consumption that reduces gaslift liquid, saves the gaslift expense.

Description of drawings:

Fig. 1: the utility model gas well is prevented salt tubular column structure figure.

1, oil pipe string 2, draining ball-and-seat 3, packer 4, tail pipe ball-and-seat 5, sleeve pipe 6, oil jacket annular space 7, gas-bearing formation

Fig. 2: the utility model gas well is prevented salt tubing string draining ball-and-seat structure chart.

8, top connection 9, lower contact 10, centre bore 11, eccentric ball-and-seat 12, inlet opening 13, fluid hole

The specific embodiment:

The utility model tubular column structure is made up of oil pipe string 1, draining ball-and-seat 2, packer 3, tail pipe ball-and-seat 4 four parts.In Fig. 1, tail pipe ball-and-seat 4 can be selected the general spherical shape ball-and-seat, and it is connected tubing string bottom, and it is inner and can not reverse flow that liquid or gas can only enter oil pipe string in the well, and tail pipe ball-and-seat 4 is down to gas-bearing formation 7 bottoms.Packer 3 can be selected Y221 packer (not being with the backwash passage) for use, and down to gas-bearing formation 7 tops, draining ball-and-seat 2 is right after on the top of packer 3, more than connect with oil pipe string 1 between each instrument.After whole tubing string is gone into the well, rotate, transfer set packer, the well head flow process is installed.With liquid nitrogen gaslift or foam gaslift, the gaslift fluid flows downward in oil pipe, tail pipe ball-and-seat 4 stops fluid to enter the oil jacket annular space of packer below 3, and the gaslift fluid enters the oil jacket annular space 6 of packer more than 3 from draining ball-and-seat 2, simultaneously the liquid in the oil pipe is headed into annular space.During the oil pipe open flow, tubing pressure reduces, annulus fluid 6 is because the effect of draining ball-and-seat 2 and packer 3 can't enter oil pipe, and following annulus fluid and the gas-bearing formation gas of packer enters oil pipe and discharges ground under the effect of gas-bearing formation 7 pressure own, recover gas well production.Can be if gaslift once can not be resumed production by carrying out the gaslift second time up to resuming production with quadrat method.After treating that gas well resumes production, oil jacket annular space 6 pours into certain annular space protection liquid or well killing fluid and is used for out the pressure on salt stratum, prevents that the stratum from going out salt or prevention casing corrosion.Its advantage was after the utility model tubing string was gone into the well: prevent that the stratum from going out salt card pipe laying post; Preventing that liquid from pouring in down a chimney enters gas-bearing formation and influences the gas well aerogenesis; But annular space adds also protective casing of protection liquid; Forehand is calmed the anger and is lifted the consumption that reduces gaslift liquid, saves the gaslift expense.

Claims

1, the anti-salt tubing string of a kind of gas well, this novel tubular column structure is made up of oil pipe string (1), draining ball-and-seat (2), packer (3), tail pipe ball-and-seat (4) four parts, it is characterized in that: the tail pipe ball-and-seat is connected tubing string bottom, down to the gas-bearing formation bottom, packer is down to the gas-bearing formation top, the draining ball-and-seat is right after the top at packer, more than connect with oil pipe string between each instrument.

2, the anti-salt tubing string of gas well according to claim 1, it is characterized in that: draining ball-and-seat (2) is made up of top connection (8), lower contact (9), centre bore (10), a plurality of eccentric ball-and-seat (11), inlet (12) communicates with oil pipe inside, liquid outlet (13) communicates with the oil jacket annular space, only allow fluid from oil pipe inside to the oil jacket inventionannulus flow.

3, the anti-salt tubing string of gas well according to claim 1, it is characterized in that: packer is divided into disconnected two sections up and down to the oil jacket annular space, and hypomere is the gas-bearing formation section, and epimere is for filling the oil jacket annular space of casing protection liquid.