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Method for removing barite blockage in oil and gas wells

A technology for barite and oil and gas wells, which is applied in chemical instruments and methods, earthwork drilling and production, wellbore/well components, etc. It can solve problems such as different technical solutions, different invention themes, and different technical effects, so as to increase production, Improve the seepage environment and increase the oil and gas production

Active Publication Date: 2017-01-11
古莱特科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The above-mentioned patents do not solve the problem of barite blockage, and are different from the subject matter of the invention of this application, the technical solutions are different, and the technical effects obtained are different

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for removing barite clogging in oil and gas wells, the steps are as follows:

[0029] (1) Configure the working solution: its composition and weight percentage concentration are: nitrogen triacetic acid (NTA) 1.0%, 4-pyridine 4-methylbenzenesulfonate 1.0%, 2-butanuonic acid sodium salt 0.5%, sodium chloride 1.0%, poly Dimethyl diallyl ammonium chloride (polydimethyl diallyl ammonium chloride) 1.0%, polyacrylamide 0.1%;

[0030] ⑵Open the well and release the blowout, obtain the original production capacity, and record the oil pressure observed before unblocking;

[0031] Note: Recording the oil pressure is convenient to compare with the production capacity after plugging removal to evaluate the plugging removal effect after the plugging removal construction is completed.

[0032] ⑶Under relatively high pressure, inject the working fluid with dispersed and dissolved barite in ⑴ from the oil pipe, and the flow rate is 2-4m 3 / min, add 200m 3 -300m 3 , shut do...

Embodiment 2

[0039] A method for removing barite clogging in oil and gas wells, the steps are as follows:

[0040] (1) Configure the working solution: its composition and weight percentage concentration are: nitrogen triacetic acid (NTA) 1.0%, 4-pyridine 4-methylbenzenesulfonate 1.0%, 2-butanuonic acid sodium salt 0.5%, sodium chloride 1.0%, poly Dimethyl diallyl ammonium chloride 1.0%, linear polyacrylamide 0.1%;

[0041] ⑵Open the well and release the blowout, obtain the original production capacity, and record the oil pressure observed before unblocking;

[0042] Note: Recording the oil pressure is convenient to compare with the production capacity after plugging removal to evaluate the plugging removal effect after the plugging removal construction is completed.

[0043] ⑶Under relatively high pressure, inject the working fluid with dispersed and dissolved barite in ⑴ from the oil pipe, and the flow rate is 2-4m 3 / min, add 200m 3 -300m 3 , shut down the well and soak for 4 hours, ...

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Abstract

The invention relates to a method for relieving barite blockage of an oil gas well. The method for relieving the barite blockage of the oil gas well includes steps that (1) preparing working solution, wherein the working solution includes 1-1.2% of nitrilortiacetic acid, 1-1.2% of pyridinium toluene-4-sulphonate, 0.3-0.8% of 2-ketobutyric acid sodium salt, 1-1.5% of sodium chloride, 1-1.2% of chlorinated poly dimethyl diallyl ammonium and 0.1-0.2% of polyacrylamide by weight; (2) opening the well for gushing, calculating original capacity, and recording an oil pressure observed before relieving the blockage; (3) filling the working solution of the step (1) for dispersing and corroding the barite from an oil pipe under a high pressure according to the flow rate of 2-4 cubic meters per minute, adding 200 to 300 cubic meters, closing the well, soaking and reacting for 4 hours at 100 to 160 degrees centigrade, and filling the working solution under open cracks; (4) opening the well for gushing, flowing back, and calculating the capacity after relieving the blockage. The method for relieving the barite blockage is capable of relieving the pollution of the barite to the near bore zones in the oil gas well drilling, completion and repair process and recovering a target oil gas layer leakage channel through corroding and dispersing the barite.

Description

[0001] This application is a divisional application of the method for unblocking barite in oil and gas wells and the working fluid used. The original application date was 2013-12-24, the original application number: 2013107222906, and the title of invention: method for unblocking barite in oil and gas wells and the working fluid used. technical field [0002] The invention belongs to the field of energy industry and oil and gas field development, and is used for increasing production of oil and gas wells, in particular to a method for removing barite blockage of oil and gas wells and the adopted working fluid. Background technique [0003] With the in-depth development of offshore and onshore oil and gas field exploration and development, the number of deep wells and ultra-deep wells has increased, and high-density weighting agents are more and more commonly added to drilling fluids. However, the addition of weighting agents increases the solid content of drilling fluids, res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/26C09K8/528
CPCC09K8/528E21B43/26
Inventor 郭丽梅王威魏三林张衍礼
Owner 古莱特科技股份有限公司
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