Oil well non-flowback working fluid and steering and energizing integrated completely-closed acidizing construction technology

A technology of construction technology and working fluid, applied in the fields of production fluids, wellbore/well components, chemical instruments and methods, etc., can solve the problems of long construction period, affecting normal production, aggravating the stuck pump and broken rod of production wells, etc. Solve residual acid corrosion, improve production stimulation effect, and improve the effect of oil well production

Active Publication Date: 2019-07-26
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the acidizing construction of oil wells needs to operate the moving pipe string, gas lift and drain liquid after acidizing, the process is complicated, and the construction period is long
During the liquid discharge process, the flowback liquid contains a large amount of residual acid, dirty oil and other substances, causing environmental pollution; without flowback production, the untreated acid liquid will cause corrosion to the pump and pipe, and aggravate the pump stuck and rod breakage in the production well. The raffinate with high salinity also makes the oil-water separator unable to work normally, causing the production system to collapse and affecting normal production, thereby limiting the application scale of oil well acidizing

Method used

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  • Oil well non-flowback working fluid and steering and energizing integrated completely-closed acidizing construction technology

Examples

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specific Embodiment approach

[0022] Specific embodiments: the present invention will be further described in conjunction with the following examples: a kind of oil well non-flowback working fluid and a fully enclosed acidification construction process integrated with steering and energy enhancement, and its oil well non-flowback working fluid consists of pre-fluid, Composed of acid liquid, steering fluid, treatment fluid, and energizing fluid; the pre-fluid is composed of 4-8% high-efficiency oil cleaning agent and the rest of hot water; the acid liquid is composed of 10-15% hydrochloric acid, 1-2.0% ammonium fluoride, 1-2% glacial acetic acid, 0.1-0.15% citric acid, 0.3-0.6% YC-II type imidazoline corrosion inhibitor synthesized in house and the rest of water; the steering liquid is composed of 5- 15% sodium carboxymethyl cellulose and the rest of the acid liquid; the treatment liquid is composed of 3-12% sodium hydroxide and the rest of the water; the energy-enhancing liquid is composed of 0.2-0.3% cocon...

Embodiment

[0029] Example: This example is a fully closed test of Gao 171-1 Well of Daqing Oil Production No. 7 Factory without flowback. 2% OP-10, 4% octylphenol polyoxyethylene ether and the rest of water; the acid solution consists of 12% hydrochloric acid, 1.5% ammonium fluoride, 1% glacial acetic acid, 0.15% citric acid, 0.5 %Indoor synthesis of YC-II imidazoline corrosion inhibitor and the rest of the water; the steering liquid is composed of 10% sodium carboxymethylcellulose and the rest of the acid; the treatment liquid is composed of 4% sodium hydroxide and the balance of water; the energy-enhancing liquid is composed of 0.2% coconut acid diethanolamide, 0.3% heavy alkylbenzene sulfonate and the balance of water; a kind of non-flowback working fluid for steering and energy-enhancing integration The chemical fully enclosed acidification construction process is realized through the following steps:

[0030] a. Squeeze 4m of pre-fluid from the casing gate 3 ;Close the valve of th...

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Abstract

The invention relates to the technical field of oil production engineering, in particular to an oil well non-flowback working fluid and steering and energizing integrated completely-closed acidizing construction technology. According to the oil well non-flowback working fluid and steering and energizing integrated completely-closed acidizing construction technology, the problems that as for commonoil well acidizing, a pipe column is moved, acidizing fluid flows back, consequently the environment is polluted, and if flowback is avoided, pump sticking, rod breaking, production influencing and the like are caused are mainly solved; the oil well non-flowback working fluid and steering and energizing integrated completely-closed acidizing construction technology is constituted by working fluidand the a non-flowback fluid steering and energizing integrated completely-closed acidizing construction technology, the working fluid is constituted by prepad fluid, the acidizing fluid, steering fluid, treating fluid and energizing fluid, the integrated completely-closed acidizing construction technology integrates prepad well flushing, steering and acidizing plug removal, and neutralizing, energizing and closing, the problem of residual acid corrosion is solved, and the yield increasing effect is also improved; and under the situations that the pipe column is not moved, flowback is avoided, and the completely-closed and pollution-free effects are achieved, organic and inorganic scales of an oil well reservoir are effectively removed, and the oil well yield is increased.

Description

technical field [0001] The invention relates to the technical field of oil production engineering, in particular to a fully enclosed acidification construction process integrating non-flowback working fluid and diversion and energy enhancement in oil wells. Background technique [0002] At present, the acidizing construction of oil wells needs to operate the moving pipe string, and the gas lift drains the liquid after acidizing. The process is complicated and the construction period is long. During the liquid discharge process, the flowback liquid contains a large amount of residual acid, dirty oil and other substances, causing environmental pollution; without flowback production, the untreated acid liquid will cause corrosion to the pump and pipe, and aggravate the pump stuck and rod breakage in the production well. The raffinate with high salinity also makes the oil-water separator unable to work normally, causing the production system to collapse and affecting normal prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22E21B43/28C09K8/514C09K8/52C09K8/584
CPCC09K8/514C09K8/52C09K8/584E21B43/16E21B43/28
Inventor 单永卓周万富王庆国刘向斌李庆松王鑫王佳盖祥福
Owner PETROCHINA CO LTD
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