CN107502323A - Fire flooding sealing agent and preparation method thereof - Google Patents

Abstract

The invention provides a fire flooding sealing agent and a preparation method thereof. Among them, the fire flooding sealing agent includes the following components by weight: 100 parts of high temperature resistant sealing material, 1 to 5 parts of fluid loss reducing agent, 1 to 3 parts of retarder, 0.01 to 0.1 part of defoaming agent and 30 parts of water ~50 copies. The fire flooding sealing agent provided by the invention can increase the effective temperature resistance of the sealing agent to 350 degrees Celsius, and improve the temperature resistance of the sealing agent.

Description

Fire flooding sealing agent and preparation method thereof

technical field

The invention relates to the technical field of oil field development, in particular to a fire flooding sealing agent and a preparation method thereof.

Background technique

Burning oil layer is also called fire flooding oil recovery technology, referred to as "fire flooding", and it is one of the earliest thermal recovery technologies. In the fire flooding technology, the problem of gas channeling is prone to occur. Gas channeling will not only reduce the production of oil wells, but also shorten the life of oil wells. It may also cause ground subsidence, resulting in casualties and huge losses. Therefore, after the gas channeling problem occurs, it is necessary to take measures to block the channeling.

Among them, an effective channel blocking measure is to use a channel sealing agent made of chemical agents for sealing. However, the temperature tolerance range of the channel sealing agent is limited. At present, the maximum temperature that the channel sealing agent can withstand is 300 degrees Celsius. When the oil temperature is higher than 300 degrees Celsius, the quality of the sealing agent will decrease due to the high temperature and gas corrosion caused by high-temperature combustion, which in turn will reduce the sealing effect.

Contents of the invention

The invention provides a fire flooding sealing agent and a preparation method thereof, which increases the effective temperature resistance of the sealing agent to 350 degrees Celsius and improves the temperature resistance of the sealing agent.

The fire flooding sealing agent provided by the present invention comprises the following components in parts by weight: 100 parts of high temperature resistant sealing material, 1 to 5 parts of fluid loss reducer, 1 to 3 parts of retarder, and 0.01 to 0.1 part of defoaming agent 30-50 parts with water.

Optionally, the high temperature resistant channeling sealing material includes the following components by weight:

100 parts of sulfoaluminate cement, 10-30 parts of hydroxyapatite, 10-30 parts of boehmite and 0-100 parts of lightening and filling materials.

Optionally, the lightening and filling material is at least one of fly ash, diatomaceous earth and floating beads.

In one embodiment, the fire flooding sealing agent consists of the following components by weight: the fire flooding sealing agent includes the following components by weight: 100 parts of sulphoaluminate cement, 10 parts of hydroxyapatite , 20 parts of boehmite, 5 parts of fly ash, 2 parts of water loss reducer, 1.5 parts of retarder, 0.04 part of defoamer and 30 parts of water.

In another embodiment, the fire flooding sealing agent is composed of the following components by weight: the fire flooding sealing agent includes the following components by weight: 100 parts of sulphoaluminate cement, 15 parts of hydroxyapatite 10 parts of boehmite, 40 parts of diatomite, 2 parts of fluid loss reducer, 1.5 parts of retarder, 0.04 part of defoamer and 30 parts of water.

In yet another embodiment, the fire flooding sealing agent consists of the following components by weight: the fire flooding sealing agent includes the following components by weight: 100 parts of sulphoaluminate cement, 20 parts of hydroxyapatite 10 parts of boehmite, 40 parts of diatomite, 2 parts of fluid loss reducer, 1.5 parts of retarder, 0.04 part of defoamer and 30 parts of water.

In yet another embodiment, the fire flooding sealing agent consists of the following components by weight: the fire flooding sealing agent includes the following components by weight: 100 parts of sulphoaluminate cement, 30 parts of hydroxyapatite 10 parts of boehmite, 20 parts of floating beads, 2 parts of fluid loss reducer, 1.5 parts of retarder, 0.04 parts of defoamer and 30 parts of water.

In yet another embodiment, the fire flooding sealing agent is composed of the following components by weight: the fire flooding sealing agent includes the following components by weight: 100 parts of sulphoaluminate cement, 28 parts of hydroxyapatite 20 parts of boehmite, 10 parts of diatomite, 2.5 parts of water loss reducer, 2.5 parts of retarder, 0.04 part of defoamer and 25 parts of water.

The preparation method of the fire flooding sealing agent provided by the invention comprises:

The high-temperature-resistant channeling sealing material, fluid loss reducing agent, retarder and defoaming agent are added into water, stirred and mixed to prepare the fire flooding channeling agent.

Implementation of the present invention has at least the following advantages:

1. The effective temperature resistance of the channel sealing agent can be increased to 350°C, which exceeds the limit of 300°C of the existing channel sealing agent, and improves the temperature resistance of the channel sealing agent.

2. The thickening time of the channel sealing agent is controllable, and the strength develops quickly, which is conducive to rapid channel sealing.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.

Fig. 1 is a thickening curve of the fire flooding sealing agent cement slurry provided in Example 1 of the present invention.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Embodiment one

In this embodiment, the fire flooding sealing agent can be composed of the following components in parts by weight: 100 parts of high temperature resistant sealing material, 1 to 5 parts of fluid loss reducer, 1 to 3 parts of retarder, and 0.01 parts of defoaming agent ～0.1 part and 30～50 parts of water.

Optionally, the high-temperature-resistant channeling sealing material can be composed of the following components in parts by weight: 100 parts of sulfoaluminate cement, 10-30 parts of hydroxyapatite, 10-30 parts of boehmite, and 0-30 parts of lightening and filling materials. 100 copies.

Optionally, the lightening and filling material can be at least one of fly ash, diatomaceous earth and floating beads. That is, the lightening and filling material can be fly ash, or diatomaceous earth, or floating beads, or a combination of at least two of fly ash, diatomaceous earth and floating beads.

Among them, the fluid loss reducing agent is used to improve the structure of the cement molding, form a dense cement molding with low permeability, and reduce the permeability of the cement molding, thereby reducing water loss. This embodiment does not limit the specific implementation of the fluid loss reducer, which may be any existing fluid loss reducer material. For example: the water loss reducing agent can be: carboxymethyl cellulose, hydroxyethyl cellulose, carboxymethyl hydroxyethyl cellulose, polyvinyl alcohol, acrylamide, styrene, etc.

Among them, the retarder is an additive used to reduce the hydration speed of cement and prolong the thickening time. This embodiment does not limit the specific realization of the retarder, which may be any existing retarder material. For example: retarder can be: sugar compound, lignosulfonate, hydroxy acid, etc.

Among them, the defoaming agent can eliminate the air bubbles generated when cement is mixed, so as to eliminate the influence of air bubbles on the rheological properties of cement slurry and the mechanical properties of cement stone. This embodiment does not limit the specific implementation of the defoamer, which may be any existing defoamer material. For example: the defoamer can be: emulsified silicone oil, high carbon alcohol fatty acid ester complex, polyoxyethylene polyoxypropylene pentaerythritol ether, polyoxyethylene polyoxypropylene alcohol amine ether, polyoxypropylene glyceryl ether and polyoxypropylene polyoxygen Vinyl Glyceryl Ether, Dimethicone, etc.

The specific preparation process of the fire flooding sealing agent provided in this embodiment is as follows:

Add high temperature resistant channeling sealing material, water loss reducing agent, retarder and defoaming agent into water, stir and mix to make fire flooding channeling sealing agent.

Optionally, during specific preparation, firstly, sulphoaluminate cement, hydroxyapatite, boehmite, lightening and filling materials are uniformly mixed to form a high temperature resistant channel sealing material.

The fire flooding sealing agent provided in this example can effectively withstand a temperature of 350° C. when used. Fig. 1 is a thickening curve of the fire flooding sealing agent cement slurry provided in Example 1 of the present invention. Specifically, the experimental conditions and experimental results are shown in Table 1, the target temperature is 55° C., and the target pressure is 30 MPa. As shown in Figure 1 and Table 1, the thickening transition time of the sealing agent cement slurry is less than 2 minutes after strength, which is conducive to rapid sealing of channeling.

Table 1 Related parameters and results of thickening experiment

The initial temperature 27.8°C target temperature 55.0°C initial pressure 0.7MPa target pressure 30.0MPa initial consistency 10.9Bc Alarm consistency 100.0Bc initial consistency starts 15.0min end of initial consistency 30.0min 30Bc thickening time 02:50:35 40Bc thickening time 02:50:50 50Bc thickening time 02:51:00 60Bc thickening time 02:50:10 70Bc thickening time 02:51:15 thickening time 02:51:31

This embodiment provides a fire flooding sealing agent, which includes the following components by weight, 100 parts of high temperature resistant sealing material, 1 to 5 parts of fluid loss reducer, 1 to 3 parts of retarder, and 0.01 parts of defoaming agent ～0.1 part and 30～50 parts of water. The fire flooding sealing agent provided in this embodiment can increase the effective temperature resistance of the sealing agent to 350° C., improving the temperature resistance of the sealing agent. At the same time, the thickening time of the channel sealing agent is controllable, and the strength develops quickly, which is conducive to rapid channel sealing.

Embodiment two

In this example, the fire flooding sealing agent is composed of the following components by weight: 100 parts of sulphoaluminate cement, 10 parts of hydroxyapatite, 20 parts of boehmite, 5 parts of fly ash, 2 parts of agent, 1.5 parts of retarder, 0.04 parts of defoamer and 30 parts of water.

The specific preparation process of the fire flooding sealing agent provided in this embodiment is as follows:

100 parts of sulfoaluminate cement, 10 parts of hydroxyapatite, 20 parts of boehmite and 5 parts of fly ash are uniformly mixed to form a high temperature resistant channeling sealing material.

Add the above-mentioned high-temperature-resistant channeling sealing material, 2 parts of water loss reducer, 1.5 parts of retarder and 0.04 part of defoamer to 30 parts of water, stir and mix to make slurry water, and configure according to GB/T 19139-2012 into cement slurry to obtain fire flooding sealing agent cement slurry.

The fire flooding sealing channeling agent that present embodiment provides, test result is as follows:

See Table 2 for the comprehensive performance of the channel sealing agent cement slurry, and see Table 3 for the compressive strength under long-term curing conditions at 350°C. According to the test results, it can be known that the fire flooding sealing agent provided in this example can increase the effective temperature resistance of the sealing agent to 350°C, and has a certain compressive strength after curing, and can thicken quickly, improving the The channeling blocking effect.

Table 2 Comprehensive properties of fire flooding sealing agent cement slurry

Table 3 Compressive strength of fire flooding sealing agent cement stone

maintenance project Cement compressive strength (MPa) 50℃*48h+350℃*7d (wet culture) 16.2 50℃*48h+350℃*14d (wet culture) 17.3 50℃*48h+350℃*21d (wet culture) 17.2 50℃*48h+350℃*28d (wet culture) 17.5

Embodiment Three

In this example, the fire flooding sealing agent is composed of the following components by weight: 100 parts of sulphoaluminate cement, 15 parts of hydroxyapatite, 10 parts of boehmite, 40 parts of diatomaceous earth. 2 parts of agent, 1.5 parts of retarder, 0.04 parts of defoamer and 30 parts of water.

The specific preparation process of the fire flooding sealing agent provided in this embodiment is as follows:

100 parts of sulfoaluminate cement, 15 parts of hydroxyapatite, 10 parts of boehmite and 40 parts of diatomaceous earth are evenly mixed to form a high temperature resistant channeling sealing material.

Add the above-mentioned high-temperature-resistant channeling sealing material, 2 parts of water loss reducer, 1.5 parts of retarder and 0.04 part of defoamer to 30 parts of water, stir and mix to make slurry water, and configure according to GB/T 19139-2012 into cement slurry to obtain fire flooding sealing agent cement slurry.

The fire flooding sealing channeling agent that present embodiment provides, test result is as follows:

The obtained fire flooding sealing agent has a cement slurry density of 1.62g/cm3, and after being wet-cured at 50°C for 48 hours and then wet-cured at 350°C for 28 days, the compressive strength can reach 12.1MPa.

Embodiment Four

In this example, the fire flooding sealing agent is composed of the following components in parts by weight: 100 parts of sulfoaluminate cement, 20 parts of hydroxyapatite, 10 parts of boehmite, 40 parts of diatomaceous earth. 2 parts of agent, 1.5 parts of retarder, 0.04 parts of defoamer and 30 parts of water.

The specific preparation process of the fire flooding sealing agent provided in this embodiment is as follows:

100 parts of sulfoaluminate cement, 20 parts of hydroxyapatite, 10 parts of boehmite and 40 parts of diatomaceous earth are uniformly mixed to form a high temperature resistant channeling sealing material.

Add the above-mentioned high-temperature-resistant channeling sealing material, 2 parts of water loss reducer, 1.5 parts of retarder and 0.04 part of defoamer to 30 parts of water, stir and mix to make slurry water, and configure according to GB/T 19139-2012 into cement slurry to obtain fire flooding sealing agent cement slurry.

The fire flooding sealing channeling agent that present embodiment provides, test result is as follows:

The obtained fire flooding sealing agent cement slurry has a density of 1.62g/cm3, is wet-cured at 50°C for 48 hours and then wet-cured at 350°C for 28 days after molding, and has a compressive strength of 12.4MPa.

Embodiment five

In this example, the fire flooding sealing agent is composed of the following components by weight: 100 parts of sulphoaluminate cement, 30 parts of hydroxyapatite, 10 parts of boehmite, 20 parts of floating beads, fluid loss reducer 2 parts, 1.5 parts of retarder, 0.04 parts of defoamer and 30 parts of water.

The specific preparation process of the fire flooding sealing agent provided in this embodiment is as follows:

100 parts of sulfoaluminate cement, 30 parts of hydroxyapatite, 10 parts of boehmite and 20 parts of floating beads are uniformly mixed to form a high temperature resistant channeling sealing material.

Add the above-mentioned high-temperature-resistant channeling sealing material, 2 parts of water loss reducer, 1.5 parts of retarder and 0.04 part of defoamer to 30 parts of water, stir and mix to make slurry water, and configure according to GB/T 19139-2012 into cement slurry to obtain fire flooding sealing agent cement slurry.

The fire flooding sealing channeling agent that present embodiment provides, test result is as follows:

The obtained fire flooding sealing agent cement slurry has a density of 1.77g/cm3, is wet-cured at 50°C for 48 hours, and then wet-cured at 350°C for 28 days, and has a compressive strength of 12.2MPa.

Embodiment six

In this example, the fire flooding sealing agent is composed of the following components by weight: 100 parts of sulphoaluminate cement, 28 parts of hydroxyapatite, 20 parts of boehmite, 10 parts of diatomaceous earth, 2.5 parts of agent, 2.5 parts of retarder, 0.04 parts of defoamer and 25 parts of water.

The specific preparation process of the fire flooding sealing agent provided in this embodiment is as follows:

100 parts of sulfoaluminate cement, 28 parts of hydroxyapatite, 20 parts of boehmite and 10 parts of diatomite are uniformly mixed to form a high temperature resistant channeling sealing material.

Add the above-mentioned high-temperature-resistant channeling sealing material, 2.5 parts of water loss reducer, 2.5 parts of retarder and 0.04 part of defoamer to 25 parts of water, stir and mix to make slurry preparation water, and configure according to GB/T 19139-2012 into cement slurry to obtain fire flooding sealing agent cement slurry.

The fire flooding sealing channeling agent that present embodiment provides, test result is as follows:

The obtained fire flooding sealing agent cement slurry has a density of 1.80g/cm3, is wet-cured at 50°C for 48 hours, and then wet-cured at 350°C for 28 days, and its compressive strength is 13.1MPa.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (9)

1. a kind of fireflood envelope alters agent, it is characterised in that includes the component of following parts by weight：High temperature resistant envelope alters 100 parts of material, and drop is lost 30~50 parts of 1~5 part of aqua, 1~3 part of retarder, 0.01~0.1 part of defoamer and water.

2. fireflood envelope according to claim 1 alters agent, it is characterised in that the high temperature resistant envelope, which alters material, includes following weight The component of part：

100 parts of sulphate aluminium cement, 10~30 parts of hydroxyapatite, 10~30 parts of boehmite and mitigation and packing material 0~100 Part.

3. fireflood according to claim 2 envelope alters agent, it is characterised in that the mitigation and packing material are flyash, silicon At least one of diatomaceous earth and floating bead.

4. fireflood envelope according to claim 3 alters agent, it is characterised in that the fireflood envelope, which alters agent, includes following parts by weight Component：100 parts of sulphate aluminium cement, 10 parts of hydroxyapatite, 20 parts of boehmite, 5 parts of flyash, 2 parts of fluid loss agent, retarder 1.5 parts, 30 parts of 0.04 part of defoamer and water.

5. fireflood envelope according to claim 3 alters agent, it is characterised in that the fireflood envelope, which alters agent, includes following parts by weight Component：100 parts of sulphate aluminium cement, 15 parts of hydroxyapatite, 10 parts of boehmite, 40 parts of diatomite, 2 parts of fluid loss agent, slow setting 30 parts of 1.5 parts of agent, 0.04 part of defoamer and water.

6. fireflood envelope according to claim 3 alters agent, it is characterised in that the fireflood envelope, which alters agent, includes following parts by weight Component：100 parts of sulphate aluminium cement, 20 parts of hydroxyapatite, 10 parts of boehmite, 40 parts of diatomite, 2 parts of fluid loss agent, slow setting 30 parts of 1.5 parts of agent, 0.04 part of defoamer and water.

7. fireflood envelope according to claim 3 alters agent, it is characterised in that the fireflood envelope, which alters agent, includes following parts by weight Component：100 parts of sulphate aluminium cement, 30 parts of hydroxyapatite, 10 parts of boehmite, 20 parts of floating bead, 2 parts of fluid loss agent, retarder 1.5 parts, 30 parts of 0.04 part of defoamer and water.

8. fireflood envelope according to claim 3 alters agent, it is characterised in that the fireflood envelope, which alters agent, includes following parts by weight Component：100 parts of sulphate aluminium cement, 28 parts of hydroxyapatite, 20 parts of boehmite, 10 parts of diatomite, 2.5 parts of fluid loss agent, delay 25 parts of solidifying 2.5 parts of agent, 0.04 part of defoamer and water.

9. a kind of fireflood envelope using described in any one of claim 1 to 8 alters the preparation method of agent, it is characterised in that including：

High temperature resistant envelope is altered into material, fluid loss agent, retarder and defoamer to be added to the water, the fireflood envelope is made after being stirred Alter agent.