Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of oil production method of casing leakage well and its double-pipe oil production string

A technology for leaking wells and oil production pipes, applied in the field of downhole oil production pipe strings, can solve problems such as difficulty in re-repair, sand production at leak points, poor suction at leak points, etc., achieve good promotion and application value, solve casing leakage problems, and have reliable working performance Effect

Inactive Publication Date: 2018-03-02
CHINA PETROLEUM & CHEM CORP +1
View PDF13 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. Packer string sticking process: simple operation and low cost, but the validity period is short, and sand is produced at the leak point, which is easy to cause overhaul. Because the original well tubing is still used for oil production, due to stuck leak, it is impossible to wash the well and measure the liquid level;
[0005] 2. Casing repair: It is not suitable for long well sections and operations corresponding to high-pressure water layers, the cost is high, and it is difficult to repair after failure;
[0006] 3. Small casing cementing: long effective period, but long operation period, high cost, difficult well cementing due to well depth, and difficult to repair again after casing breaks;
[0007] 4. Cement plugging process: Sometimes the construction pressure is too high, and the cement slurry is difficult to squeeze into the target layer continuously, which may easily cause overhaul; the leakage point has extremely poor suction, about ≦0.1m 3 / min, the conventional plugging agent cannot be squeezed into the leak point
[0008] In view of the above difficulties in the process of casing leakage treatment, conventional means can no longer meet the treatment requirements. Therefore, it has been developed to develop a production string for controlling casing leakage and casing damage wells that is simple to operate, low in cost, long in validity, and not easy to overhaul. very necessary

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of oil production method of casing leakage well and its double-pipe oil production string
  • A kind of oil production method of casing leakage well and its double-pipe oil production string

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] see figure 1 , the double-pipe production string used for the oil production method of a casing leakage well includes a tubing 2, a packer 5 is seated between the tubing 2 and the casing 1, and is located above the oil layer below the casing leakage point, and the tubing 2 The small-diameter tubing 4 and the small-diameter tubular pump 3 are lowered into the middle, the tubing 2 is suspended at the wellhead through the lower tubing head 7, and the small-diameter tubing 4 is connected to the pump barrel of the small-diameter tubular pump 3 and suspended at the wellhead through the upper tubing head 6 , can realize the operation of flushing the well and measuring the liquid level, the packer 5 is no longer invalidated by the influence of the alternating load, the sealing effect is good, and the validity period is long. The inner diameter of the lower oil pipe head 7 is greater than the inner diameter of the upper oil pipe head 6, and the upper oil pipe head 6 is threadedl...

Embodiment 2

[0022] see figure 2 , the double-pipe production string used for the oil production method of a casing leakage well includes a tubing 2, a packer 5 is seated between the tubing 2 and the casing 1, and is located above the oil layer below the casing leakage point, and the tubing 2 Insert the hollow sucker rod 8 and the rod type oil well pump 9 in the middle, and the support sleeve of the rod type oil well pump 9 is fixed on the oil pipe 2 . The support sleeve of the rod well pump 9 can also be fixed on the tubing 2 below the packer 5. If the support sleeve is fixed below the packer 5, the validity period will be longer and the ferrule leakage effect will be better. The oil pipe 2 above the device 5 leaks, and oil recovery is also possible. The diameter of the hollow sucker rod 8 is 36mm; the diameter of the oil pipe 2 is 89mm, and the hollow sucker rod 8 serves as a liquid flow channel.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to an oil production method for a casing leakage well and a double-pipe oil production string thereof, which can be used in casing leakage wells with problems such as long well sections, high-pressure water layers, and extremely poor suction at leakage points. In the present invention, a packer is used to seal between the casing and the oil pipe above the oil layer below the leakage point of the casing, and a small-diameter oil pipe is used to install a small-diameter tubular pump for oil production in the oil pipe, or a hollow sucker rod is used to install a rod-type oil pump for oil production. . The present invention adopts a double-pipe oil production string formed by oil pipes and small-diameter oil pipes or oil pipes and hollow sucker rods, and uses small-diameter oil pipes or hollow sucker rods as liquid flow passages to effectively control the casing with small variable diameters and no breakage Casing damage and leaking wells with problems such as long well sections, high-pressure water layers, and extremely poor suction at leak points. The treatment method is simple, the input cost is low, the validity period is long, and it is not easy to cause overhaul operations, and can solve the problem of casing leakage of any length. It can restore the production of most casing leakage wells, and the economic benefit is remarkable.

Description

technical field [0001] The invention relates to a downhole oil recovery string of an oil production well in the petroleum industry, in particular to an oil recovery method for a casing leakage well and a double-pipe oil recovery string. The present invention can be used in casing leakage wells with problems such as long well sections, high-pressure water layers, and extremely poor suction at leakage points, so as to restore the production of the above-mentioned oil wells in the production process after well completion and slow down the rise of comprehensive water cut in the oil wells. Background technique [0002] In the middle and late stages of oil and gas field development, casing damage and casing leakage caused by various reasons are becoming more and more serious, resulting in increased water cut and declining production in oil wells, seriously restricting the sustainable and stable development of mature oil fields. According to statistics, about half of casing damage ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/00
Inventor 孙渊平江少波董元军李淑芳张子玉王长俊
Owner CHINA PETROLEUM & CHEM CORP