CN114276791A - High-filtration-loss plugging agent for oil-based drilling fluid - Google Patents
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Abstract
The invention provides a high-filtration-loss plugging agent for an oil-based drilling fluid, which aims to solve the problem that the existing plugging material for the water-based drilling fluid is not matched in the oil-based drilling fluid, and belongs to the technical field of petroleum drilling. The high-filtration-loss plugging agent for the oil-based drilling fluid comprises the following raw materials in percentage by mass, wherein the sum of the mass percentages of the high-filtration-loss plugging agent is 100 percent: 2 to 10 percent of plant fiber; 1% -5% of polypropylene fiber; 1% -5% of polyester fiber; 2-5% of an adhesive; 2 to 5 percent of tackifier; 50 to 80 percent of limestone powder; 5 to 10 percent of barium sulfate powder; 5 to 10 percent of ceramic powder. The high-filtration-loss plugging agent for the oil-based drilling fluid has good compatibility with the oil-based drilling fluid and good plugging effect.
Description
Technical Field
The invention relates to the technical field of petroleum drilling, in particular to a high-filtration leakage plugging agent for an oil-based drilling fluid.
Background
In recent years, China has made a great deal of development in exploration and development of shale gas resources. With the gradual rise of the exploration and development degree of oil and gas resources and the gradual expansion of the development range, the oil-based drilling fluid is more and more widely applied to the drilling of strata under complex geological conditions such as high-temperature deep wells, offshore drilling wells, large-inclination directional wells, horizontal wells, various complex well sections, deep ultra-deep layers, deep ocean deep water, pressure failure and the like. Consequently, the problem of oil-based drilling fluid loss is also becoming more severe. Studies have shown that about 90% of the drilling fluid loss problems are caused by the extensive propagation of natural or induced fractures, which, once lost, inevitably results in significant material waste, aggravates oil-based drilling fluid costs, and delays drilling cycles, causing significant economic losses. Therefore, the problem of leakage of the oil-based drilling fluid is solved, and the development of the oil-based drilling fluid plugging agent is a subject which is urgently needed to be researched by oil-based drilling fluid workers at present.
The existing plugging materials for the water-based drilling fluid are various in types, and an adaptive plugging method can be selected according to different leakage situations to perform effective plugging. However, the plugging material cannot well perform the plugging function due to the mismatching with the oil-based drilling fluid, so that the applicability of the plugging material in the aspect of the oil-based drilling fluid is limited. Therefore, it is necessary to develop a high fluid loss plugging agent specially suitable for oil-based drilling fluid.
Disclosure of Invention
The invention provides a high-filtration-loss plugging agent for an oil-based drilling fluid, which aims to solve the problem that the existing plugging material for the water-based drilling fluid is not matched in the oil-based drilling fluid, and has better compatibility with the oil-based drilling fluid and good plugging effect.
The technical scheme adopted by the invention is as follows:
the high-fluid-loss plugging agent for the oil-based drilling fluid comprises the following raw materials in percentage by mass, wherein the sum of the mass percentages of the high-fluid-loss plugging agent is 100 percent:
2 to 10 percent of plant fiber;
1% -5% of polypropylene fiber;
1% -5% of polyester fiber;
2-5% of an adhesive;
2 to 5 percent of tackifier;
50 to 80 percent of limestone powder;
5 to 10 percent of barium sulfate powder;
5 to 10 percent of ceramic powder.
Further, the lengths of the plant fibers, the polypropylene fibers and the polyester fibers are 0.1-10 mm.
Further, the adhesive is high molecular polymer emulsion.
Furthermore, the adhesive is propylene monomer modified vinyl acetate emulsion, multi-component oxidized polyethylene wax emulsion, multi-component copolymerized vinyl acetate-ethylene emulsion or vinyl acetate-acrylate multi-component copolymer emulsion.
Further, the tackifier is organic soil.
Furthermore, in the limestone powder, the weight ratio of 20 meshes, 40 meshes, 200 meshes and 1000 meshes of the limestone powder is 1:1: 5-30: 5-10.
Further, in the barium sulfate powder, the weight ratio of the barium sulfate powder of 200 meshes to the barium sulfate powder of 400 meshes is 1: 1.
Further, in the ceramic powder, the weight ratio of 180-mesh ceramic powder to 250-mesh ceramic powder is 6: 4.
furthermore, besides the raw materials of the high-filtration-loss plugging agent, a proper amount of walnut shells or rigid particles with the particle size of 10 meshes, 12 meshes, 14 meshes, 16 meshes or 18 meshes are additionally added.
Further, the rigid particles are calcite, marble, or limestone.
The invention has the beneficial effects that:
the invention provides a high-filtration-loss plugging agent for an oil-based drilling fluid, which aims to solve the problem that the existing plugging material for the water-based drilling fluid is not matched in the oil-based drilling fluid. The high-filtration-loss plugging agent for the oil-based drilling fluid comprises the following raw materials in percentage by mass, wherein the sum of the mass percentages of the high-filtration-loss plugging agent is 100 percent: 2 to 10 percent of plant fiber; 1% -5% of polypropylene fiber; 1% -5% of polyester fiber; 2-5% of an adhesive; 2 to 5 percent of tackifier; 50 to 80 percent of limestone powder; 5 to 10 percent of barium sulfate powder; 5 to 10 percent of ceramic powder.
The high-fluid-loss plugging agent disclosed by the invention has the following characteristics:
1. the high-filtration-loss plugging agent for the oil-based drilling fluid has better compatibility with the oil-based drilling fluid and is specially used for plugging operation in the drilling process of the oil-based drilling fluid.
2. The high-filtration-loss plugging agent for the oil-based drilling fluid, disclosed by the invention, can be mixed with base oil (diesel oil or white oil) for the oil-based drilling fluid to prepare the oil-based high-filtration-loss plugging slurry. Under the action of pressure difference, the leakage stopping slurry enters the leakage passage, and is quickly deposited, filtered, compacted and glued to form a plug with certain coalescence strength, so that leakage is prevented.
3. The plug formed by the high-fluid-loss plugging agent for the oil-based drilling fluid has a certain net rack and coagulation strength, has good adhesive force with the stratum, has plasticity, can adapt to stress sensitivity change of the width of a crack, can prevent the plug from losing efficacy or 'spitting back' due to pressure fluctuation in the well, has wider applicability, simple and convenient plugging process, safe construction, high success rate and quick response.
4. The plugging slurry prepared from the high-filtration-loss plugging agent for the oil-based drilling fluid can plug cracks and holes with the diameter of less than 2 mm. If the plugging agent is used for plugging a leakage passage with a larger size, a proper amount of rigid particles or walnut shells can be added to improve the bridging capacity.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a graph of a sample after the sand bed plugging test of example 4.
Detailed Description
In the following, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.
The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention.
Embodiments of the invention are described in detail below with reference to the accompanying drawings.
The high-fluid-loss plugging agent for the oil-based drilling fluid comprises the following raw materials in percentage by mass, wherein the sum of the mass percentages of the high-fluid-loss plugging agent is 100 percent:
2 to 10 percent of plant fiber;
1% -5% of polypropylene fiber;
1% -5% of polyester fiber;
2-5% of an adhesive;
2 to 5 percent of tackifier;
50 to 80 percent of limestone powder;
5 to 10 percent of barium sulfate powder;
5 to 10 percent of ceramic powder.
Further, the lengths of the plant fibers, the polypropylene fibers and the polyester fibers are 0.1-10 mm.
Further, the adhesive is high molecular polymer emulsion.
Furthermore, the adhesive is propylene monomer modified vinyl acetate emulsion, multi-component oxidized polyethylene wax emulsion, multi-component copolymerized vinyl acetate-ethylene emulsion or vinyl acetate-acrylate multi-component copolymer emulsion.
Further, the tackifier is organic soil.
Furthermore, in the limestone powder, the weight ratio of 20 meshes, 40 meshes, 200 meshes and 1000 meshes of the limestone powder is 1:1: 5-30: 5-10.
Further, in the barium sulfate powder, the weight ratio of the barium sulfate powder of 200 meshes to the barium sulfate powder of 400 meshes is 1: 1.
Further, in the ceramic powder, the weight ratio of 180-mesh ceramic powder to 250-mesh ceramic powder is 6: 4.
furthermore, besides the raw materials of the high-filtration-loss plugging agent, a proper amount of walnut shells or rigid particles with the particle size of 10 meshes, 12 meshes, 14 meshes, 16 meshes or 18 meshes are additionally added. For example, the walnut shells accounting for 1-10% of the total weight of the raw materials of the high-filtration leakage plugging agent are added, so that the leakage plugging agent is used for plugging leakage of leakage channels with larger sizes, and the bridging capacity is improved.
Further, the rigid particles are calcite, marble, or limestone.
A preparation method of a high fluid loss plugging agent for an oil-based drilling fluid, wherein the high fluid loss plugging agent is mixed before the oil-based drilling fluid is prepared, and the preparation method comprises the following steps:
step S1, mixing the tackifier, the barium sulfate powder, the ceramic powder and half limestone powder to obtain a first premixed mixture;
step S2, premixing the plant fibers, the polypropylene fibers, the polyester fibers and the residual lime powder to obtain a second premixed mixture;
and step S3, mixing a proper amount of base oil of the oil-based drilling fluid with the first premixed mixture, the second premixed mixture and the adhesive to obtain the high-fluid-loss plugging agent dispersed in the base oil. When the dosage is high, the weight of the base oil is not counted.
By adopting the preparation method, the direct contact of the high-molecular polymer emulsion and powder can be avoided, the loss and water loss are reduced, and the performance of the raw material is ensured. The polymer emulsion can keep a relatively dispersed state in the base oil, and enters the underground cracks along with the rest powder under high pressure to stop the leakage. Under the action of pressure difference, the polymer emulsion enters the leakage passage along with the leakage stopping slurry, and forms a plug through rapid bridging, deposition and filtration. Meanwhile, the polymer emulsion exists in an emulsion state in oil, and fiber particles are adsorbed and cemented by virtue of the polarity effect, so that the filling is more compact, and the polymer emulsion has certain coalescence strength, thereby preventing leakage. The walnut shells or the rigid particles which are additionally added when the large cracks are plugged can be added when the first premixed mixture is prepared.
Embodiments 1-4 adopt the above method to prepare the high fluid loss plugging agent for the oil-based drilling fluid, which comprises the following specific components:
example 1: a high-filtration-loss plugging agent for oil-based drilling fluid comprises the following components: 3g of plant fiber, 3g of polypropylene fiber, 2g of polyester fiber, 4g of poly-oxidized polyethylene wax emulsion, 2g of organic soil, 75g of limestone powder, 5g of barium sulfate powder and 6g of ceramic powder. Wherein, in the limestone powder, the weight ratio of 20 meshes, 40 meshes, 200 meshes and 1000 meshes is 1:1:10: 6; in the barium sulfate powder, the weight ratio of the barium sulfate powder of 200 meshes to the barium sulfate powder of 400 meshes is 1: 1; in the ceramic powder, the weight ratio of 180-mesh ceramic powder to 250-mesh ceramic powder is 6: 4.
example 2: a high-filtration-loss plugging agent for oil-based drilling fluid comprises the following components: 6g of plant fiber, 3g of polypropylene fiber, 3g of polyester fiber, 4g of poly-copolymerized vinyl acetate-ethylene emulsion, 2g of organic soil, 62g of limestone powder, 5g of barium sulfate powder and 5g of ceramic powder. Wherein, in the limestone powder, the weight ratio of 20 meshes, 40 meshes, 200 meshes and 1000 meshes is 1:1:10: 6; in the barium sulfate powder, the weight ratio of the barium sulfate powder of 200 meshes to the barium sulfate powder of 400 meshes is 1: 1; in the ceramic powder, the weight ratio of 180-mesh ceramic powder to 250-mesh ceramic powder is 6: 4.
example 3: a high-filtration-loss plugging agent for oil-based drilling fluid comprises the following components: 6g of plant fiber, 3g of polypropylene fiber, 1g of polyester fiber, 4g of vinyl acetate-acrylate multi-component copolymer emulsion, 2g of organic soil, 74g of limestone powder, 5g of barium sulfate powder and 5g of ceramic powder. Wherein, in the limestone powder, the weight ratio of 20 meshes, 40 meshes, 200 meshes and 1000 meshes is 1:1:25: 10; in the barium sulfate powder, the weight ratio of the barium sulfate powder of 200 meshes to the barium sulfate powder of 400 meshes is 1: 1; in the ceramic powder, the weight ratio of 180-mesh ceramic powder to 250-mesh ceramic powder is 6: 4.
example 4: a high-filtration-loss plugging agent for oil-based drilling fluid comprises the following components: 10g of plant fiber, 1g of polypropylene fiber, 5g of polyester fiber, 5g of vinyl acetate-acrylate multi-component copolymer emulsion, 1g of organic soil, 70g of limestone powder, 4g of barium sulfate powder and 4g of ceramic powder. Wherein, in the limestone powder, the weight ratio of 20 meshes, 40 meshes, 200 meshes and 1000 meshes is 1:1:10: 6; in the barium sulfate powder, the weight ratio of the barium sulfate powder of 200 meshes to the barium sulfate powder of 400 meshes is 1: 1; in the ceramic powder, the weight ratio of 180-mesh ceramic powder to 250-mesh ceramic powder is 6: 4.
the high fluid loss plugging agent of examples 1-4 was selected for the following performance tests.
1. Total fluid loss time and mud cake thickness
The experimental method comprises the following steps: adding 15% (weight/volume) of high-filtration plugging agent for oil-based drilling fluid into 250mL of 0# diesel oil, stirring at high speed for 30 s, and pouring all the plugging agent into a medium-pressure water loss instrument within 3 min. The sample slurry total fluid loss time was measured and the filter cake thickness was measured. The results are shown in Table 1.
TABLE 1 Total fluid loss time, mud cake thickness
| Sample numbering | Total fluid loss time(s) | Mud cake thickness (mm) | Quality of mud cake |
| Example 1 | 38”06 | 9 | Relatively uniform and not loose |
| Example 2 | 54”34 | 9 | Relatively uniform and not loose |
| Example 3 | 34”81 | 11 | Relatively uniform and not loose |
| Example 4 | 21”16 | 18 | Relatively uniform and not loose |
As can be seen from Table 1, the high fluid loss plugging agent can rapidly lose fluid in 0# diesel oil, and the formed mud cake is not loose and compact and has certain thickness.
2. Stability of sedimentation
The experimental method comprises the following steps: adding 30% of high-filtration loss plugging agent for oil-based drilling fluid into 300mL of 0# diesel oil, stirring at high speed for 10min, weighting by using barite powder until the density is 2.0g/cm3. Pouring into a 100mL measuring cylinder with a plug to reach 100mL scale marks, standing for 8h at normal temperature, and recording the stability condition.
TABLE 2 Normal temperature 8h sedimentation stability
| Sample numbering | Oil deposition volume (mL) | Description of the invention |
| Example 1 | 0.5 | No sedimentation at the bottom |
| Example 2 | 0.5 | No sedimentation at the bottom |
| Example 3 | 0.5 | No sedimentation at the bottom |
| Example 4 | 5 | No sedimentation at the bottom |
As can be seen from Table 2, a small amount of oil is separated out after standing for 8 hours at normal temperature. The high fluid loss plugging agent has suspension stability under the normal temperature condition.
3. Plugging property of sand bed
The experimental method comprises the following steps: (1) adding 25% of high-fluid-loss plugging agent for oil-based drilling fluid into 400mL of 0# diesel oil, stirring at high speed for 10min, and preparing high-fluid-loss plugging slurry.
(2) Weighing quartz sand (with the particle size of 12-21 mm) with a certain mass, pouring the quartz sand into an FA non-permeability filtration apparatus with the particle size of 350cm3At the scale lines, shake evenly and make the skin hard. Slowly pouring high-filtration plugging slurry, measuring the leakage amount under the conditions of 0.7MPa and 30min, and observing the depth of the plugging slurry invading the sand bed and the formed plugging depth. Then 300mL of oil-based mud (ρ =2.2 g/cm) was poured in3) And measuring the filtration loss at 0.7MPa for 30min, and observing the invasion depth of the oil-based mud.
TABLE 3 Sand bed plugging Experimental data
| Sample numbering | Sand bed filtration loss mL | Depth of penetration of plugging slurry is mm | Depth of blockage mm | Oil-based mud invasion depth mm | Oil-based mud fluid loss mL |
| Example 1 | 10 | Full penetration | 55 | 30 | 0 |
| Example 2 | 13 | Full penetration | 57 | 31 | 0 |
| Example 3 | 4 | Full penetration | 36 | 25 | 0 |
| Example 4 | 6.2 | Full penetration | 49 | 18 | 0 |
The sample after the sand bed plugging test in example 4 is shown in figure 1. As can be seen from the table 3 and the figure 1, under the action of pressure, the plugging slurry is subjected to full fluid loss to form blockage, and the blockage has a certain thickness, so that the leakage of the oil-based mud is prevented, and the high-fluid-loss plugging agent for the oil-based drilling fluid has a good sand bed plugging effect.
4. Bearing capacity
The experimental method comprises the following steps:
(1) the evaluation method of the 4.4.6 pressure bearing capacity in the evaluation standard (Q/67579579-6.179-2003) of the temporary plugging agent for drilling in Chuanqing is referred. A DL-type leakage plugging material experimental device is used, 15% diesel oil-based leakage plugging slurry is taken to perform an experiment on a seam plate with the width of 1mm under the pressure of 2 MPa. The displacement fluid is oil-based mud (rho =2.2 g/cm)3）。
(2) Stabilizing pressure for 10min under the pressure of 2MPa, gradually increasing the pressure of an air source to 5MPa if no pressure drop exists, stabilizing the pressure for 5min, and observing the pressure drop condition.
TABLE 4 pressure bearing Capacity data
As can be seen from Table 4, the high fluid loss plugging slurry for the oil-based drilling fluid can form plugging in a 1mm seam plate, and the compressive strength of the high fluid loss plugging slurry can reach 5 MPa.
The high-fluid-loss plugging agent disclosed by the invention has the following characteristics:
1. the high-filtration-loss plugging agent for the oil-based drilling fluid has better compatibility with the oil-based drilling fluid and is specially used for plugging operation in the drilling process of the oil-based drilling fluid.
2. The high-filtration-loss plugging agent for the oil-based drilling fluid, disclosed by the invention, can be mixed with base oil (diesel oil or white oil) for the oil-based drilling fluid to prepare the oil-based high-filtration-loss plugging slurry. Under the action of pressure difference, the leakage stopping slurry enters the leakage passage, and is quickly deposited, filtered, compacted and glued to form a plug with certain coalescence strength, so that leakage is prevented.
3. The plug formed by the high-fluid-loss plugging agent for the oil-based drilling fluid has a certain net rack and coagulation strength, has good adhesive force with the stratum, has plasticity, can adapt to stress sensitivity change of the width of a crack, can prevent the plug from losing efficacy or 'spitting back' due to pressure fluctuation in the well, has wider applicability, simple and convenient plugging process, safe construction, high success rate and quick response.
4. The plugging slurry prepared from the high-filtration-loss plugging agent for the oil-based drilling fluid can plug cracks and holes with the diameter of less than 2 mm. If the plugging agent is used for plugging a leakage passage with a larger size, a proper amount of rigid particles or walnut shells can be added to improve the bridging capacity.
Claims (10)
1. The high-fluid-loss plugging agent for the oil-based drilling fluid is characterized by comprising the following raw materials in percentage by mass of 100 percent:
2 to 10 percent of plant fiber;
1% -5% of polypropylene fiber;
1% -5% of polyester fiber;
2-5% of an adhesive;
2 to 5 percent of tackifier;
50 to 80 percent of limestone powder;
5 to 10 percent of barium sulfate powder;
5 to 10 percent of ceramic powder.
2. The high fluid loss plugging agent for the oil-based drilling fluid according to claim 1, wherein the plant fiber, the polypropylene fiber and the polyester fiber have a length of 0.1 to 10 mm.
3. The high fluid loss plugging agent for oil-based drilling fluid according to claim 1, wherein the adhesive is a high molecular polymer emulsion.
4. The high fluid loss plugging agent for oil-based drilling fluid according to claim 3, wherein the adhesive is a propylene monomer modified vinyl acetate emulsion, a poly oxidized polyethylene wax emulsion, a poly copolymerized vinyl acetate-ethylene emulsion or a vinyl acetate-acrylate multi copolymer emulsion.
5. The high fluid loss plugging agent for oil-based drilling fluid according to claim 1, wherein the tackifier is an organic soil.
6. The high-filtration-loss plugging agent for the oil-based drilling fluid according to claim 1, wherein the limestone powder of 20 meshes, 40 meshes, 200 meshes and 1000 meshes is in a weight ratio of 1:1: 5-30: 5-10.
7. The high-fluid-loss plugging agent for the oil-based drilling fluid according to claim 1, wherein the weight ratio of the barium sulfate powder of 200 meshes to the barium sulfate powder of 400 meshes is 1: 1.
8. The high fluid loss plugging agent for oil-based drilling fluid according to claim 1, wherein the weight ratio of 180-mesh to 250-mesh ceramic powder in the ceramic powder is 6: 4.
9. the high fluid loss plugging agent for the oil-based drilling fluid according to claim 1, wherein a proper amount of walnut shells or rigid particles with a particle size of 10 meshes, 12 meshes, 14 meshes, 16 meshes or 18 meshes are additionally added to the raw materials except for the high fluid loss plugging agent.
10. The high fluid loss plugging agent for oil-based drilling fluid according to claim 9, wherein the rigid particles are calcite, marble or limestone.
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| CN109097013A (en) * | 2018-09-06 | 2018-12-28 | 中国海洋石油集团有限公司 | A kind of high temperature resisting type oil base drilling fluid pressure-bearing sealing agent and preparation method thereof |
| CN110819322A (en) * | 2019-11-08 | 2020-02-21 | 成都汉元君业油田技术有限公司 | Special high-filtration-loss plugging agent for oil-based drilling fluid |
| CN111808224A (en) * | 2020-07-17 | 2020-10-23 | 中国石油大学(北京) | Copolymer and preparation method thereof, application of copolymer as plugging agent, oil-based drilling fluid and application of oil-based drilling fluid |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104152119A (en) * | 2013-05-13 | 2014-11-19 | 中国石油化工股份有限公司 | Oil-based drilling fluid use preparation |
| CN104388067A (en) * | 2014-10-31 | 2015-03-04 | 中国石油化工集团公司 | Compound leak preventive for oil-based drilling fluid |
| CN105086956A (en) * | 2015-08-28 | 2015-11-25 | 中国石油集团川庆钻探工程有限公司工程技术研究院 | Tackifier for oil-based drilling fluid and preparation method therefor |
| CN109097013A (en) * | 2018-09-06 | 2018-12-28 | 中国海洋石油集团有限公司 | A kind of high temperature resisting type oil base drilling fluid pressure-bearing sealing agent and preparation method thereof |
| CN110819322A (en) * | 2019-11-08 | 2020-02-21 | 成都汉元君业油田技术有限公司 | Special high-filtration-loss plugging agent for oil-based drilling fluid |
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