CN115680568A - Solid cleaning corrosion inhibition acid fracturing method - Google Patents
Solid cleaning corrosion inhibition acid fracturing method Download PDFInfo
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- CN115680568A CN115680568A CN202211380938.1A CN202211380938A CN115680568A CN 115680568 A CN115680568 A CN 115680568A CN 202211380938 A CN202211380938 A CN 202211380938A CN 115680568 A CN115680568 A CN 115680568A
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Abstract
The invention relates to the technical field of reservoir blockage removal, and discloses a solid cleaning corrosion inhibition acid fracturing method, which comprises the following steps: s1: the particle powder is transported to the site and added from a sand mixer in proportion, the subsequent process is the same as the conventional storage and modification operation, and the particle powder is mainly used for water well blockage removal and injection increase, oil well blockage removal and yield increase, thick oil viscosity reduction and yield increase and the like; s2: through a continuous water supply system, an additive online accurate adding system, a working solution mixing system and the like 3, a clear water pump pumps clear water from a reservoir, the flow is recorded through a flowmeter, and an additive pump adds additives in proportion in real time according to the flow of the clear water. According to the solid cleaning corrosion inhibition acid fracturing method, the solid cleaning acid is pumped before the fracturing fluid is pumped, and the solid cleaning acid can be freely combined with different auxiliaries to effectively corrode carbonate, sandstone and the like; the iron ions and the like are prevented from generating secondary precipitation due to complexation and reducibility; and the reaction rate is controllable, the transport is easy, and deep acidification can be realized.
Description
Technical Field
The invention relates to the technical field of reservoir blockage removal, in particular to a solid cleaning corrosion inhibition acid fracturing method.
Background
The most common process method for reservoir blockage removal is to select a proper acid liquid to inject into a stratum or a pipe, and remove scale by utilizing the corrosion action of acid, but the method has certain limitations: the blockage removal waste liquid needs to be subjected to flowback treatment, but a certain amount of residual acid residues in the well still have incomplete flowback, secondary pollution can be caused, the treatment of flowback acid liquid is difficult, the environmental pollution is serious, the scaling of barium strontium calcium sulfate and polymer hardly has any effect, the treatment of scale containing FeS can generate highly toxic H2S, and the flowback treatment is difficult and has high risk.
The conventional acid liquor has the defects and disadvantages that (1) the acid liquor is volatile, and smoke generated in the using process has strong stimulation and corrosivity, so that the acid liquor causes harm and pollution to human bodies, equipment and the surrounding environment; (2) Strong corrosion, special equipment is needed for transportation and storage, and the risk and the insecurity are high; (3) the volatilization loss is large, the use efficiency is low, and the pollution is serious; (4) The acid rock reaction speed of the liquid hydrochloric acid is high, the effective action radius is small, and the effect of acidification measures is seriously influenced; (5) inconvenient to use, transport and store; (6) Because the common solid acid main agent is in an acid-generating solid state and has formaldehyde release in the dissolving process, the use in a reappearance field is easy, and the water generated after the hot-cold reaction can be automatically exploded (which has already occurred in Hangjinqi); (7) The novel solid acid is mainly composed of solid clean hydrochloric acid as a main agent, and is compounded with auxiliary agents such as different solid fluoborates to form an acid fracturing blockage relieving system suitable for different application requirements, so that the corrosion action on various components of the compact sandstone reservoir is realized.
Therefore, a safe, environment-friendly and efficient solid hydrochloric acid is needed on site, and the solid hydrochloric acid is used as a series of products for replacing the traditional acid blockage removal, and meets the requirement of reservoir blockage removal, so that a solid cleaning corrosion inhibition acid fracturing method is provided to solve the problems.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a solid cleaning corrosion inhibition acid fracturing method which has the advantages of good corrosion effect, safety, convenience in transportation and the like and solves the problems of poor corrosion effect and serious environmental pollution.
(II) technical scheme
In order to achieve the purposes of good corrosion effect, safety and convenient transportation, the invention provides the following technical scheme: a solid cleaning corrosion inhibition acid fracturing method comprises the following steps:
s1: the particle powder is transported to the site and added from a sand mixing truck according to a proportion, the subsequent process is the same as the conventional storage and transformation operation, and the particle powder is mainly used for the operations of water well blockage removal and injection enhancement, oil well blockage removal and yield increase, thick oil viscosity reduction and yield increase and the like;
s2: through 3 major parts of a continuous water supply system, an additive online accurate adding system, a working solution mixing system and the like, a clean water pump pumps clean water from a reservoir, the flow is recorded through a flowmeter, an additive pump adds additives in proportion in real time according to the flow of the clean water, and the additives are uniformly stirred through a transition tank (if the transition tank is used) and then are supplied to a sand mixer truck;
s3: pre-solid acid fracturing, namely pumping pre-fluid into the well bottom in advance to form a gap in the rock stratum, pumping a section of solid cleaning acid into the well bottom to further corrode the rock stratum and enlarge the gap, pumping a section of pre-fluid again, dredging micro cracks and rock holes by acid fluid corrosion, cleaning fracturing fluid for fracture formation, carrying sand to construct artificial fractures, forming a relatively complex fracture system, and improving the single-well productivity;
s4: the 10% solid cleaning acid, 3% ammonium fluoride and 1.5% composite auxiliary agent in the step S3 can mainly aim at the acid sensitivity problem caused by iron ions of chlorite, and the 10% solid cleaning acid, 3% ammonium fluoride and 1% composite auxiliary agent can aim at the calcium precipitation damage caused by calcite;
s5: then RASA solid particles and carrier fluid (or linear gel fracturing fluid) are injected into a fracturing blender truck as the fracturing process fluid preparation construction is carried out, and when the mixed fluid is injected into the well, RASA particles are added into the 'sand carrying fluid' according to the designed addition amount by the fracturing blender truck and are injected into the reservoir fracture together by a discharge pump.
Preferably, the slickwater mixing device integrally developed and matched in the step S2 has the following capabilities: (1) accurately adding 3-4 additives on line; (2) the continuous mixing capacity is 15-18 m3/ra ln; (3) the adding precision of the additive is +/-3 percent; (4) the working solution is uniform, and the performance meets the construction requirement.
Preferably, the pad fluid in step S3 is one of water, a potassium chloride solution and an acid solution, and when the pad fluid is pumped in step S3, an anti-scaling agent may be added to the pad fluid.
Preferably, the basic formula of the solid cleaning acid in the step S3 is as follows: 10 to 30 percent of solid hydrochloric acid, 2 to 4 percent of solid fluoborate and 1 to 2 percent of composite synergist.
Preferably, the compound additive in step S4 is composed of an oil displacement agent, a secondary precipitation preventing agent and a high-efficiency surfactant, and the action mechanism is as follows: solid acid + ammonium fluoride to HF acid, organic carboxylate (solid acid has this component) + HF acid to dicarboxylic acid (slow/complex).
Preferably, in step S4, a plugging removal complex acid formula can be obtained by taking water, 6% of solid acid, 0.3% of a gel breaker and 0.003% of an activation cleanup additive, and a gel breaking plugging removal formula can be generated by taking 4.5% of solid acid, 0.003% of an activation cleanup additive and 0.1% of a gel breaker-2 (all in water percentage).
(III) advantageous effects
Compared with the prior art, the invention provides a solid cleaning corrosion inhibition acid fracturing method which comprises the following steps
Has the beneficial effects that:
1. according to the solid cleaning corrosion inhibition acid fracturing method, the solid cleaning acid is pumped before the fracturing fluid is pumped, and the solid cleaning acid can be freely combined with different auxiliaries to effectively dissolve carbonate, sandstone and the like; the complex and the reducibility are realized, and secondary precipitation of iron ions and the like is prevented; and the reaction rate is controllable, the transport is easy, and deep acidification can be realized.
2. According to the solid cleaning corrosion inhibition acid fracturing method, the solid cleaning acid is used, capsules are not required to be wrapped, and no capsule residue has secondary blocking influence on the stratum; the surface tension is low, flowback is easy, the damage to a reservoir is low, the formula is simple, and the field operation is safe, environment-friendly and easy to implement; convenient transportation and storage, safe and convenient use and environmental protection.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
s1: the particle powder is transported to the site and added from a sand mixing truck according to a proportion, the subsequent process is the same as the conventional storage and transformation operation, and the particle powder is mainly used for the operations of water well blockage removal and injection enhancement, oil well blockage removal and yield increase, thick oil viscosity reduction and yield increase and the like;
s2: through a continuous water supply system, an additive online accurate adding system, a working solution mixing system and the like 3, a clean water pump pumps clean water from a reservoir, the flow is recorded through a flowmeter, an additive pump adds additives in proportion in real time according to the flow of the clean water, and the additives are uniformly stirred through a transition tank (if the transition tank is used) and then supplied to a sand mixing truck;
s3: pre-solid acid fracturing, wherein pre-liquid is pumped into the bottom of a well in advance to form a gap in a rock stratum, then a section of solid cleaning acid is pumped into the gap to further corrode the rock stratum and enlarge the gap, and the basic formula of the solid cleaning acid is as follows: the method comprises the steps of (1) pumping a section of pad fluid into a container, carrying out acid liquor corrosion to dredge micro cracks and rock holes, cleaning fracturing fluid for crack formation, carrying sand to construct artificial cracks, forming a relatively complex crack system, and improving the single-well productivity, wherein the pad fluid is acid liquor, and an antiscaling agent can be added into the pad fluid when the pad fluid is pumped;
s4: the 10% solid cleansing acid, 3% ammonium fluoride and 1.5% composite auxiliary agent in the step S3 can mainly aim at the acid sensitivity problem caused by iron ions of chlorite, while the 10% solid cleansing acid, 3% ammonium fluoride and 1% composite auxiliary agent can aim at calcium precipitation damage caused by calcite, the acidity is lower at normal temperature, under the conditions of high temperature and reaction with stratum, acid components are slowly separated out to erode stratum blockage, and complex parts of Fe & lt 3+ & gt and Fe & lt 2+ & gt are uniformly reacted with the stratum, so that secondary sediment is not easily generated, the erosion reaction time is long, the reaction distance is far and well unblocked, and the composite auxiliary agent consists of an oil displacement agent, a secondary precipitation preventive agent and a high-efficiency surfactant, and the action mechanism is as follows: solid acid and ammonium fluoride generate HF acid, organic carboxylate (the solid acid has the component) and HF acid generates dicarboxylic acid (retarding/complexing), phosphoric acid (the solid acid has the component) is a retarding acidification system (PPAS), the ionization degree of phosphoric acid (H3 PO 4) is low, a remarkable retarding effect is achieved after a special additive is added, the PPAS with high concentration is used together with HF, the composite acid is particularly suitable for treating sandstone or limestone reservoir layers with high calcium content, a deblocking compound acid formula can be obtained by taking water, 6% of solid acid, 0.3% of gel breaker and 0.003% of activation cleanup additive, and a gel breaking deblocking formula can be generated by taking 4.5% of solid acid, 0.003% of activation cleanup additive and 0.1% of gel breaker-2 (the water content);
s5: then RASA solid particles and carrier fluid (or linear gel fracturing fluid) are injected into a fracturing blender truck as the fracturing process fluid preparation construction is carried out, and when the mixed fluid is injected into the well, RASA particles are added into the 'sand carrying fluid' according to the designed addition amount by the fracturing blender truck and are injected into the reservoir fracture together by a discharge pump.
The second embodiment:
s1: the particle powder is transported to the site and added from a sand mixing truck according to a proportion, the subsequent process is the same as the conventional storage and transformation operation, and the particle powder is mainly used for the operations of water well blockage removal and injection enhancement, oil well blockage removal and yield increase, thick oil viscosity reduction and yield increase and the like;
s2: through a continuous water supply system, an additive online accurate adding system, a working solution mixing system and the like 3, a clean water pump pumps clean water from a reservoir, the flow is recorded through a flowmeter, an additive pump adds additives in proportion in real time according to the flow of the clean water, and the additives are uniformly stirred through a transition tank (if the transition tank is used) and then supplied to a sand mixing truck;
s3: pre-solid acid fracturing, wherein pre-liquid is pumped into the bottom of a well in advance to form a gap in a rock stratum, then a section of solid cleaning acid is pumped into the gap to further corrode the rock stratum and enlarge the gap, and the basic formula of the solid cleaning acid is as follows: 30% of solid hydrochloric acid, 4% of solid fluoborate and 2% of composite synergist, pumping the section pad fluid again, utilizing acid liquor to erode and dredge micro cracks and rock holes, cleaning fracturing fluid to make cracks and carrying sand to construct artificial cracks, forming a relatively complex crack system, improving the single-well productivity, wherein the pad fluid is potassium chloride solution, and an antiscaling agent can be added into the pad fluid when the pad fluid is pumped;
s4: the 10% solid cleansing acid, 3% ammonium fluoride and 1.5% composite auxiliary agent in the step S3 can mainly aim at the acid sensitivity problem caused by iron ions of chlorite, while the 10% solid cleansing acid, 3% ammonium fluoride and 1% composite auxiliary agent can aim at calcium precipitation damage caused by calcite, the acidity is lower at normal temperature, under the conditions of high temperature and reaction with stratum, acid components are slowly separated out to erode stratum blockage, and complex parts of Fe & lt 3+ & gt and Fe & lt 2+ & gt are uniformly reacted with the stratum, so that secondary sediment is not easily generated, the erosion reaction time is long, the reaction distance is far and well unblocked, and the composite auxiliary agent consists of an oil displacement agent, a secondary precipitation preventive agent and a high-efficiency surfactant, and the action mechanism is as follows: solid acid and ammonium fluoride generate HF acid, organic carboxylate (the solid acid has the component) and HF acid generates dicarboxylic acid (retarding/complexing), phosphoric acid (the solid acid has the component) is a retarding acidification system (PPAS), the ionization degree of phosphoric acid (H3 PO 4) is low, a remarkable retarding effect is achieved after a special additive is added, the PPAS with high concentration is used together with HF, the composite acid is particularly suitable for treating sandstone or limestone reservoir layers with high calcium content, a deblocking compound acid formula can be obtained by taking water, 6% of solid acid, 0.3% of gel breaker and 0.003% of activation cleanup additive, and a gel breaking deblocking formula can be generated by taking 4.5% of solid acid, 0.003% of activation cleanup additive and 0.1% of gel breaker-2 (the water content);
s5: then RASA solid particles and carrying fluid (or linear gel fracturing fluid) are injected into a sand mixing truck as well as fracturing process fluid preparation construction, and when the mixed fluid is injected into a well, RASA particles are added into the 'sand carrying fluid' according to the designed addition amount by the sand mixing truck and are injected into a reservoir fracture together by a discharge pump.
The beneficial effects of the invention are: the product is non-toxic, easy to degrade, the reaction speed of blockage removal and scale removal is low, the reservoir rock framework is not damaged, the reservoir rock framework can generate a complexing effect with metal ions such as Mq2+, ca2+, ba2+, sr2+, fe3+, fe2+ and the like, a stable soluble complex is generated, the complex does not exist in the form of ionized ions, the complex does not combine with corresponding acid radical ions to generate a precipitate with the pH value range of 5.0-6.5 or 11-13, the complex is non-combustible and non-explosive, the corrosion rate of 'non-dangerous chemicals' to the conventional oil sleeve material is less than 0.5 g/(m2. H), no HS gas is generated, no CI, S2-, SO2-, PO3 and the like are contained, no benzene, aldehyde, ether, phenol and the like are contained, the pH of waste liquid is 6-8, and the clay swelling prevention performance is achieved according to the conventional waste water treatment.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A solid cleaning corrosion inhibition acid fracturing method is characterized by comprising the following steps:
s1: the particle powder is transported to the site and added from a sand mixing truck according to a proportion, the subsequent process is the same as the conventional storage and transformation operation, and the particle powder is mainly used for the operations of water well blockage removal and injection enhancement, oil well blockage removal and yield increase, thick oil viscosity reduction and yield increase and the like;
s2: through 3 major parts of a continuous water supply system, an additive online accurate adding system, a working solution mixing system and the like, a clean water pump pumps clean water from a reservoir, the flow is recorded through a flowmeter, an additive pump adds additives in proportion in real time according to the flow of the clean water, and the additives are uniformly stirred through a transition tank (if the transition tank is used) and then are supplied to a sand mixer truck;
s3: pre-solid acid fracturing, wherein pre-pad fluid is pumped into the well bottom in advance to form a gap in the rock stratum, then a section of solid cleaning acid is pumped into the well bottom to further corrode the rock stratum and enlarge the gap, then a section of pre-pad fluid is pumped into the well bottom again, acid liquor is used for corrosion and dredging microcracks and rock pores, fracturing fluid is cleaned for crack formation, sand is carried to construct artificial cracks, a relatively complex crack system is formed, and the single well productivity is improved;
s4: the 10% solid cleaning acid, 3% ammonium fluoride and 1.5% composite auxiliary agent in the step S3 can mainly aim at the acid sensitivity problem caused by iron ions of chlorite, and the 10% solid cleaning acid, 3% ammonium fluoride and 1% composite auxiliary agent can aim at the calcium precipitation damage caused by calcite;
s5: then RASA solid particles and carrying fluid (or linear gel fracturing fluid) are injected into a sand mixing truck as well as fracturing process fluid preparation construction, and when the mixed fluid is injected into a well, RASA particles are added into the 'sand carrying fluid' according to the designed addition amount by the sand mixing truck and are injected into a reservoir fracture together by a discharge pump.
2. The solid cleaning corrosion inhibiting acid fracturing method of claim 1, wherein: the slickwater mixing device integrally developed and matched in the step S2 has the following capabilities: (1) accurately adding 3-4 additives on line; (2) the continuous mixing capacity is 15-18 m3/rain; (3) the adding precision of the additive is +/-3 percent; (4) the working solution is uniform, and the performance meets the construction requirement.
3. The solid cleaning corrosion inhibiting acid fracturing method of claim 1, wherein: the pad fluid in the step S3 is one of water, a potassium chloride solution and an acid solution, and when the pad fluid is pumped in the step S3, an antiscaling agent can be added into the pad fluid.
4. The solid cleaning corrosion inhibiting acid fracturing method of claim 1, wherein: the basic formula of the solid cleaning acid in the step S3 is as follows: 10 to 30 percent of solid hydrochloric acid, 2 to 4 percent of solid fluoborate and 1 to 2 percent of composite synergist.
5. The solid cleaning corrosion inhibition acid fracturing method of claim 1, wherein: the compound additive in the step S4 consists of an oil displacement agent, a secondary precipitation preventive agent and a high-efficiency surfactant, and the action mechanism is as follows: solid acid + ammonium fluoride to HF acid, organic carboxylate (solid acid has this component) + HF acid to dicarboxylic acid (slow/complex).
6. The solid cleaning corrosion inhibition acid fracturing method of claim 1, wherein: in the step S4, the plugging removal complex acid formula can be obtained by taking water, 6% of solid acid, 0.3% of gel breaker and 0.003% of activating cleanup additive, and the gel breaking plugging removal formula can be generated by taking 4.5% of solid acid, 0.003% of activating cleanup additive and 0.1% of gel breaker-2 (which are water content ratios).
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| CN202211380938.1A CN115680568A (en) | 2022-11-05 | 2022-11-05 | Solid cleaning corrosion inhibition acid fracturing method |
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| CN202211380938.1A CN115680568A (en) | 2022-11-05 | 2022-11-05 | Solid cleaning corrosion inhibition acid fracturing method |
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