CN104327817A

CN104327817A - Shaft oil stain detergent as well as preparation method and application

Info

Publication number: CN104327817A
Application number: CN201410629259.2A
Authority: CN
Inventors: 陆昌盛; 邓明坚; 陈建达; 吴雷泽; 李亚林; 华继军
Original assignee: Oil Production Technology Research Institute Of Jianghan Oilfield Branch China Petroleum & Chemical Corp
Current assignee: Oil Production Technology Research Institute Of Jianghan Oilfield Branch China Petroleum & Chemical Corp
Priority date: 2014-11-11
Filing date: 2014-11-11
Publication date: 2015-02-04

Abstract

The invention provides a shaft oil stain detergent as well as a preparation method and an application. The shaft oil stain detergent consists of the following components in percentage by weight: 0.2-2% of a surfactant OP-10, 5-10% of a builder STPP, 2-5% of a pH adjusting agent NaOH and the balance of water. The preparation method comprises the following steps: completely dissolving the STTP of the amount into water, adding NaOH of the amount, and dripping OP-10 of the amount, thereby preparing the shaft oil stain detergent. The grease dissolution rate of the shaft oil stain detergent is greater than 90%, and the shaft oil stain detergent has good dispersion and solubilization functions.

Description

A kind of pit shaft greasy dirt detergent, preparation method and application

Technical field

The present invention relates to shale reservoir fracturing field, say further, relate to a kind of pit shaft greasy dirt detergent, preparation method and application.

Background technology

In shale gas well, because wellbore clean situation is poor, being hampered easily appears in later stage pumping bridging plug; In fracturing process, in pit shaft, oil casing threaded packing grease and oil base drilling fluid slurry mixture easily form viscous, package action to the propping agent in first paragraph fracturing process, cause sand setting, sand plug phenomenon, cause have a strong impact on construction.At present, adopt active water to be communicated with the good of stratum to recover pit shaft viscous crude, the even organic deposition that pit shaft carries out producing in well-flushing process daily output production, the injecting process as oil and water well measure is last, the main component of these dirty things is colloid, bituminous matter and paraffin etc.And at present shale gas well mostly is and newly drowns oneself in a well, pit shaft foul is mainly the greasy filth boring early stage, produce in well-completion practice process, and main component is oil casing threaded packing grease and oil base drilling fluid slurry mixture, adopts active water to be difficult to remove above-mentioned greasy filth.

At present, domestic water based cleaning agent is various in style, and most kind is heated wash agent, and minority is low-temperature cleaning agent.Low-temperature cleaning agent working conditions is harsh, consumption is large, cost is high, and be used for the dirt on metallic article surface, the water-base metal clean-out system mostly be containing tensio-active agent is used to degreasing degreasing, be mainly used in light industry, daily use chemicals, the fields such as food-processing, also some well wellbore clean-out systems are had in addition, but have no report for the normal temperature washing agent of shale gas well shaft greasy dirt, wellbore cleanout agent as described in patent No. CN102533236A " a kind of Washing agent for shafts used in oil fields and preparation method thereof ", based on anion-nonionic tensio-active agent and amphoterics, add polar organic thing and the composite composition of organic solvent, the thick-oil emulsified adhesive-reducing in pit shaft mainly can be made to disperse, to pitch, organic deposition has certain dissolving, dispersive ability, and the capillary resistance eliminating oil and gas flow improves Oil/gas Well output.But the greasy filth boring, produce in well-completion practice process is dissolved, dispersing property is poor.

Summary of the invention

For solving produced problem in prior art, the invention provides a kind of pit shaft greasy dirt detergent, preparation method and application.The present invention is exactly the deficiency of boring Completion Operations formation for Washing agent for shafts used in oil fields at cleaning gas well, research and develop a kind of normal temperature pit shaft greasy dirt detergent, specific aim is had more to shale gas well shaft greasy filth, and do not need heating, to pit shaft dirt, there is good dispersion, emulsification, solublization under normal temperature.For improving shale gas well shaft clean-up performance, ensure that pressure break adds in sand process, propping agent enters stratum by pit shaft smoothly, avoids the sand plug that may occur when shale gas well staged fracturing is constructed, be beneficial to the construction of follow-up fracturing section, there is good using value.

An object of the present invention is to provide a kind of pit shaft greasy dirt detergent.

Be made up of the following component of weight percent meter:

Surfactant OP-10 0.2% ~ 2%, is preferably 0.2% ~ 0.5%;

Washing assistant STPP 5% ~ 10%, is preferably 6% ~ 9%;

PH conditioning agent NaOH 2% ~ 5%, is preferably 2% ~ 4%;

Surplus is water.

Polyoxyethylene alkylphenol ether [OP-10]---tensio-active agent.Tensio-active agent can make solution surface tension greatly reduce, there is the effects such as wetting infiltration, suspended dispersed, emulsification and solubilising, little to the damage of cleaning object, and to dissimilar dirt, generally there is good removal ability, often the tensio-active agent of very low concentrations just has obvious soil-removing action.

Tripoly phosphate sodium STPP [STPP]---washing assistant.Can improve and improve the over-all properties of tensio-active agent, soil removability is improved.This washing assistant can strengthen dirt suspending power in the solution, plays the object of antiredeposition.In soliquid, the polyvalent cation core of inside particles is the principal element causing suspended substance flocking settling, and this washing assistant is the ionogen micella of a multivalence negative charge, the two contacts with each other and peptization reaction occurs and makes positively charged ion passivation, thus solids are stably disperseed, suspend in the solution, play deflocculated effect.Therefore, the removal of washing assistant to impurity such as dust, greasy dirt, protein, pectin can play an important role.

NaOH---PH conditioning agent.Utilize PH conditioning agent, play under high pH value and slow down washing assistant hydrolytic action, play alkaline buffer effect, make solution ph remain on more than 10, thus be conducive to the removal of acid dirt.

The present invention is based on tensio-active agent, adds a certain amount of inorganic builders, PH conditioning agent, and after tensio-active agent compatibility, detersive power substantially exceeds the two simple superposition, produces significantly " synergy " effect.There is the synergistic function of good comprehensive, dispersion, emulsification, solubilising, antiredeposition, PH buffering and Surfactant.Clean-out system fat melting rate of the present invention is greater than 90%.There is good dispersion, solublization.

Embodiment

Below in conjunction with embodiment, further illustrate the present invention.

Embodiment 1:

Clear water 92ml is added in order in 250ml glass reactor, 5g tripoly phosphate sodium STPP (deriving from Hubei Xing Zhongcheng Science and Technology Ltd.), particle NaOH (Hua Chuan Chemical Co., Ltd. of Wuhan City) 2g, stir dissolving, drip OP-10 (deriving from Wuhan Long Ruida development in science and technology company limited) 0.2ml, obtain No. 1, clean-out system.

Embodiment 2:

In 250ml glass reactor, add clear water 90ml in order, add 7g tripoly phosphate sodium STPP, particle NaOH 3g, stir dissolving, drips OP-10 0.3ml, obtain No. 2, clean-out system.

Embodiment 3:

In 250ml glass reactor, add clear water 88ml in order, add 8g tripoly phosphate sodium STPP, particle NaOH 3g, stir dissolving, drips OP-10 1ml, obtain No. 3, clean-out system.

Embodiment 4:

In 250ml glass reactor, add clear water 83ml in order, add 10g tripoly phosphate sodium STPP, particle NaOH 5g, stir dissolving, drips OP-10 2ml, obtain No. 4, clean-out system.

Wellbore cleanout agent prepared by embodiment 1 ~ 4 is mixed with sample 20% (pure sample product regarded as by clean-out system), under room temperature (25 DEG C) condition, survey its surface tension (ring method) according to SY/T5370-1999 " Surface and interface tension determining method " with interfacial tensimeter, drip interfacial tension with TX500C full-automatic spin and measure its interfacial tension; Fat melting rate mensuration is carried out according to Q/JHCYJ 0053-2014 " JC-QX2 clean-out system ".Test result is as shown in table 1.

Table 1

Test sample	Surface tension, mN/m	Interfacial tension, mN/m	Fat melting rate, %
				No. 1, clean-out system	32.0	0.35	90.5
No. 2, clean-out system	30.5	0.28	92.6
				No. 3, clean-out system	30.0	0.26	96
No. 4, clean-out system	30.0	0.22	99

Take the oily sludge sample 5g in shale gas pit shaft, add 20% detergent solution (prepared by embodiment 4) 100ml, stir 3min with glass stick, greasy dirt sample dissolves completely, disperses.Indoor employing thread seal lubricating grease and quartz sand are mixed and made into oil-sand, and carry out dissolution experiment with the clean-out system of preparation to oil-sand, fat melting rate can reach 98%.There is good dispersion, solublization.

Claims

1. a pit shaft greasy dirt detergent, is characterized in that described clean-out system is made up of the following component of weight percent meter:

Surfactant OP-10 0.2% ~ 2%;

Washing assistant STPP 5% ~ 10%;

PH conditioning agent NaOH 2% ~ 5%;

Surplus is water.

2. pit shaft greasy dirt detergent as claimed in claim 1, is characterized in that:

Surfactant OP-10 0.2% ~ 0.5%;

Washing assistant STPP 6% ~ 9%;

PH conditioning agent NaOH 2% ~ 4%;

Surplus is water.

3. a preparation method for pit shaft greasy dirt detergent as claimed in claim 1 or 2, is characterized in that described method comprises:

The STPP of described consumption is dissolved completely in water, after add the NaOH of described consumption, then drip the OP-10 of described consumption, obtained described pit shaft greasy dirt detergent.

4. the application of a pit shaft greasy dirt detergent as claimed in claim 1 or 2 in shale gas well.